IN MEMORY OF Yu.
BELIAEV |
35-37 |
|
|
Editorial |
|
|
|
The Gnedenko Forum
is deeply saddened to announce the death, at the
age of 93 of one of the leading experts in
probability theory, mathematical statistics and
their applications, Doctor of Physical and
Mathematical Sciences, Professor, Laureate of
the State Prize of the USSR YURI KONSTANTINOVICH
BELYAEV (31 August 1932, Moscow - 22 January
2025, Umeå, Sweden).

|
|
|
|
A NEW GENERALIZED
EXPONENTIATED FAMILY OF CONTINUOUS DISTRIBUTIONS
WITH APPLICATIONS TO ENVIRONMENTAL DATA SETS |
38-52 |
|
|
Ibrahim, Sule,
Olalekan Akanji, Bello, Ismail Adekunle,
Kolawole |
|
|
|
Different
researchers in the field of distribution theory
have derived new models for generalizing the
classical ones to make them more flexible and to
aid their application in various fields. This
generalization and extension of the classical
models is mostly done using families of
distributions. This article presents a new
family of distributions called the Exponentiated
Pareto-G family of distributions with two
positive shape parameters. Some statistical
properties of the new family of distributions,
such as explicit expressions for the quantile
function, probability-weighted moments, moments,
generating function, Reliability function,
hazard function, and order statistics are
discussed. A maximum likelihood estimation
technique is employed to estimate the model
parameters. Two submodels such as Weibull and
Frechet distributions are employed to check the
fit of the family of distributions with the aid
of their pdf and hazard function plots. Also, a
simulation study is presented to assess the
performance of the maximum likelihood estimator.
Furthermore, two real-life applications are
carried out to assess the fit and flexibility of
the new family using the Weibull model as the
baseline. The results showed that the new
distribution fits better in the two real data
sets considered among the range of distributions
considered. |
|
 |
|
Cite: Ibrahim,
Sule, Olalekan Akanji, Bello, Ismail Adekunle,
Kolawole A NEW GENERALIZED EXPONENTIATED FAMILY
OF CONTINUOUS DISTRIBUTIONS WITH APPLICATIONS TO
ENVIRONMENTAL DATA SETS. Reliability: Theory &
Applications. 2025, March 1(82):38-52. DOI: https://doi.org/10.24412/1932-2321-2025-182-38-52
|
|
|
|
A WEIGHTED THREE-PARAMETER XGAMMA
DISTRIBUTION WITH PROPRTIES AND ITS APPLICATION
TO REAL LIFE DATA |
53-66 |
|
|
P.
Pandiyan, Athira D V |
|
|
|
In
this article, a weighted three-parameter Xgamma
distribution has been proposed. It is an
extension of two-parameter Xgamma distribution.
The weighted three-parameter Xgamma distribution
designed for modelling real-life data. The
density function and cumulative distribution
function, moments, hazard and survival function,
moment-generating function and characteristic
function, Bonferroni and Lorenz curve, renyi
entropy of this distribution have all been
derived. The parameter of this distribution is
estimated by maximum likelihood estimation
method. Finally, an application of the model to
a real-life data set is presented and compared
with some other existing distributions. |
|
 |
|
Cite: P. Pandiyan, Athira D V A WEIGHTED
THREE-PARAMETER XGAMMA DISTRIBUTION WITH
PROPRTIES AND ITS APPLICATION TO REAL LIFE DATA.
Reliability: Theory & Applications. 2025, March
1(82):53-66. DOI: https://doi.org/10.24412/1932-2321-2025-182-53-66
|
|
|
|
STRESS-STRENGTH MODELLING: RANKED
SET AND SIMPLE RANDOM SAMPLING IN GENERALIZED
INVERSE WEIBULL ANALYSIS |
67-79 |
|
|
Surinder Kumar, Bhupendra Meena, Rahul Shukla,
Shivendra Pratap Singh |
|
|
|
This
study explores the stress-strength reliability
model (P) for Generalized Inverse Weibull (GIW)
distribution through transformation techniques.
We compare two sampling methods: ranked set
sampling (RSS) and simple random sampling (SRS),
where stress and strength are two independent
random variables from the GIW distribution
respectively. RSS, is used for estimating
stress-strength model, as this technique of
sampling is more efficient alternative of SRS
for obtaining the more informative sample. In
this article, the maximum likelihood estimator (MLE)
for stress-strength model is obtained through
transforming technique. MLE estimates of
stress-strength obtained through Ranked set
sampling (RSS) methods are evaluated against
corresponding estimates derived from simple
random sampling (SRS) to understand their
relative effectiveness and accuracy. The
statistical estimators derived from Ranked Set
Sampling (RSS) methodology exhibit superior
efficiency relative to their Simple Random
Sampling (SRS) counterparts. The empirical
utility of RSS-based estimation procedures is
subsequently validated through application to
real datasets. |
|
 |
|
Cite: Surinder Kumar, Bhupendra Meena, Rahul
Shukla, Shivendra Pratap Singh STRESS-STRENGTH
MODELLING: RANKED SET AND SIMPLE RANDOM SAMPLING
IN GENERALIZED INVERSE WEIBULL ANALYSIS.
Reliability: Theory & Applications. 2025, March
1(82):67-79. DOI: https://doi.org/10.24412/1932-2321-2025-182-67-79
|
|
|
|
AGRICULTURAL PRODUCTION PATTERNS
IN TAMIL NADU: INSIGHTS FROM VECTOR
AUTOREGRESSIVE ANALYSIS USING PYTHON PROGRAMMING |
80-91 |
|
|
R.
Kamalanathan, A. Sheik Abdullah, A. Jawahar
Farook |
|
|
|
Understanding agricultural production patterns
is crucial for enhancing productivity and
ensuring food security. This study explores the
dynamics of agricultural production in Tamil
Nadu using the Vector Autoregressive (VAR) model
to capture the interdependence among various
crop yields and rainfall over time. Employing
Python programming for data analysis and
modeling, the study leverages historical
time-series data to identify trends, forecast
production, and analyze the impact of external
shocks on agricultural outputs. The research
incorporates preprocessing techniques to ensure
stationarity, optimal lag selection using
Akaike’s Information Criterion(AIC) and Bayesian
Information Criterion(BIC), and diagnostic
checks for model accuracy and stability. The
findings provide insights into the temporal
relationships among various crops and rainfall.
Additionally, Impulse Response Functions(IRF)
and variance decomposition analyses offer a
deeper understanding of how shocks to one
variable propagate through the system. The study
demonstrates the utility of Python-based VAR
models in agricultural forecasting and
decision-making, offering policymakers and
stakeholders a robust tool to improve resource
allocation and agricultural planning in Tamil
Nadu. This work highlights the potential of
data-driven approaches to address challenges in
the agricultural sector effectively. |
|
 |
|
Cite: R. Kamalanathan, A. Sheik Abdullah, A.
Jawahar Farook AGRICULTURAL PRODUCTION PATTERNS
IN TAMIL NADU: INSIGHTS FROM VECTOR
AUTOREGRESSIVE ANALYSIS USING PYTHON PROGRAMMING
. Reliability: Theory & Applications. 2025,
March 1(82):80-91. DOI: https://doi.org/10.24412/1932-2321-2025-182-80-91
|
|
|
|
APPLICATION OF FUZZY DYNAMIC
GROUP MULTI-CRITERIA DECISION MAKING BASED ON
Z-NUMBERS |
92-104 |
|
|
Kamala Aliyeva |
|
|
|
Dynamic group multi-criteria decision making is
essential for making informed, balanced, and
adaptive decisions in complex and evolving
environments. By integrating multiple
methodologies and considering the dynamic nature
of criteria and group interactions, dynamic
group multi-criteria decision making provides a
robust framework for decision-making across
various fields and applications. Dynamic group
fuzzy multi-criteria decision making under
Z-information is a sophisticated approach that
incorporates the dynamic aspects of decision
making, the involvement of multiple stakeholders,
and the use of fuzzy logic to handle
uncertainties and imprecise information.
Z-information refers to a type of uncertain
information that combines fuzzy numbers and
Z-numbers, where Z-numbers account for both the
reliability of the information and its fuzziness.
By integrating fuzzy logic and Z-numbers, it
effectively handles dual uncertainties of
fuzziness and reliability, while dynamically
adapting to changes in criteria and stakeholder
preferences. In this article, a dynamic
multi-criteria decision-making model is proposed
to solve strategic vendor selection problems
that need to be evaluated in different time
periods and involve uncertainty. Z-information
is used to express uncertainty and in the
proposed model, the decision-making group is
asked to evaluate the alternatives in different
time periods, and the evaluations made for these
different periods are combined. |
|
 |
|
Cite: Kamala Aliyeva APPLICATION OF FUZZY
DYNAMIC GROUP MULTI-CRITERIA DECISION MAKING
BASED ON Z-NUMBERS . Reliability: Theory &
Applications. 2025, March 1(82):92-104. DOI: https://doi.org/10.24412/1932-2321-2025-182-92-104
|
|
|
|
A NEW CLASS OF COS-G FAMILY OF
DISTRIBUTIONS WITH APPLICATIONS |
105-123 |
|
|
Pankaj Kumar, Laxmi Prasad Sapkota, Vijay Kumar |
|
|
|
This
paper introduces a novel family of probability
distributions, termed the Cos-G family, which is
derived from a trigonometric transformation
approach. We present the general structural
properties of this family and focus on one of
its unique members. This newly proposed
distribution, formulated from the inverse
Weibull distribution, exhibits flexible hazard
rate shapes, including reverse-J, increasing,
and inverted bathtub forms. We investigate its
fundamental statistical properties and employ
the maximum likelihood estimation method to
estimate its parameters. The performance of the
estimation technique is assessed through a Monte
Carlo simulation, revealing that biases and mean
square errors decrease as sample size increases,
ensuring reliable parameter estimation even for
small samples. To illustrate its practical
applicability, we fit the suggested model to
three real-world datasets and compare its
performance against existing models using
various goodness-of-fit measures and model
selection criteria. The results confirm the
superiority of the proposed model in capturing
complex data structures. |
|
 |
|
Cite: Pankaj Kumar, Laxmi Prasad Sapkota,
Vijay Kumar A NEW CLASS OF COS-G FAMILY OF
DISTRIBUTIONS WITH APPLICATIONS. Reliability:
Theory & Applications. 2025, March
1(82):105-123. DOI: https://doi.org/10.24412/1932-2321-2025-182-105-123
|
|
|
|
SOME APPLICATIONS OF
EXPONENTIATED LOG-UNIFORM DISTRIBUTION |
124-134 |
|
|
Anu
AV, Rani Sebastian |
|
|
|
In
this paper we introduced Exponentiated Log -
Uniform distribution as a generalisation of the
Log - Uniform distribution and its properties
are studied. We provide graphical
representations of its density function,
cumulative distribution function, hazard rate
function, and survival function. And derive
various statistical properties such as moments,
mean deviations, and quantile function of the
new distribution. We also obtain the probability
density functions of the order statistics of the
Exponentiated Log-Uniform Distribution.To
estimate the parameters of the distribution and
the stress strength parameters, we use the
maximum likelihood method, and validate the
estimates of the model parameters through a
simulation study. Our findings reveal that the
Exponentiated Log-Uniform Distribution exhibits
the least bias and that the values of the mean
square error decrease as the sample size
increases, indicating the effectiveness of this
distribution in modeling real-world data. We
applied the Exponentiated Log-Uniform
distribution to a real data set and compared it
with Exponentiated Quasi Akash Distribution and
Exponentiated Weibull Distribution. It was found
that the new distribution was a better fit than
the other distributions based on the values of
the AIC, CAIC, BIC, HQIC, the Kolmogorov-Smirnov
(K-S) goodness-of-fit statistic and the p-values. |
|
 |
|
Cite: Anu AV, Rani Sebastian SOME
APPLICATIONS OF EXPONENTIATED LOG-UNIFORM
DISTRIBUTION. Reliability: Theory & Applications.
2025, March 1(82):124-134. DOI: https://doi.org/10.24412/1932-2321-2025-182-124-134
|
|
|
|
APPLICATIONS OF SIMULATIONS AND
QUEUING THEORY IN SUPERMARKET |
135-140 |
|
|
Shruti Gupta, Nishant Yadav, Khushwant Singh,
Puneet Garg |
|
|
|
This
paper describes the role of queuing theory in
supermarket or shopping complex. Generally, a
supermarket is a place where people are gathered
to purchase the daily requirement products and
here, a queue represents the customers/items in
ascending or descending order. An interesting
aspect of queuing process resides in the
measures of its system’s performance especially
in terms of average service rate and system’s
utilization. Simulation is a powerful and
versatile tool for modeling facilities in
supermarket. So, queuing process with simulation
provide the average service rate and it helps in
predicting queue lengths as well as waiting
durations when multiple items are manufactured
and distributed using first come first serve
discipline. M/M/s model and poisson process are
used to explore the supermarket with server
arrival rate and service rate. |
|
 |
|
Cite: Shruti Gupta, Nishant Yadav, Khushwant
Singh, Puneet Garg APPLICATIONS OF SIMULATIONS
AND QUEUING THEORY IN SUPERMARKET. Reliability:
Theory & Applications. 2025, March
1(82):135-140. DOI: https://doi.org/10.24412/1932-2321-2025-182-135-140
|
|
|
|
ALPHA POWER TRANSFORMED WEIBULL
LOMAX DISTRIBUTION: PROPERTIES AND ITS
APPLICATIONS |
141-156 |
|
|
Fathima Thensi N, Nazeema Beevi.T |
|
|
|
We
proposed a new model called the Alpha Power
Transformed Weibull-Lomax (APTWL) distribution
which extends the Weibull Lomax distribution and
have an increasing, decreasing and bathtub
shapes for the hazard rate function. Various
structural properties of the new distribution
are derived including moments, probability
weighted moments, generating and quantile
function. The Renyi and q entropies are also
obtained. Statistical inference is presented for
the APTWL distribution using the method of
maximum likelihood estimation to estimate the
parameters of proposed distribution. The
potentiality of the new model is illustrated by
means of three real life datasets. The results
of the analysis of the datasets show the
superiority of APTWL distribution over some
compared distributions. |
|
 |
|
Cite: Fathima Thensi N, Nazeema Beevi.T
ALPHA POWER TRANSFORMED WEIBULL LOMAX
DISTRIBUTION: PROPERTIES AND ITS APPLICATIONS.
Reliability: Theory & Applications. 2025, March
1(82):141-156. DOI: https://doi.org/10.24412/1932-2321-2025-182-141-156
|
|
|
|
ALTERNATE QUADRA-SUBMERGING POLAR
FUZZY GRAPH AND ITS DECISION MAKING ANALYSIS |
157-171 |
|
|
Anthoni Amali A, J . Jesintha Rosline, Aruna G |
|
|
|
In
this article, the two extreme values [-1,1] is
proposed with it’s uncertain submerging values
[-0.5,0.5] as the Alternate Quadra Submerging
Polar (AQSP) Fuzzy Graph. The AQSP Fuzzy graph
COVID-19 vaccines survey model has been analyzed
to find the highest and the lowest membership
and the non-membership value of the five
influencing factors effectively. The notion of
the AQSP fuzziness has been considered from the
various points of view, in the specification of
variables with the multiple input of single
output rule. The self-reporting nature of the
collected survey data of the COVID - 19 Booster
shots acceptance and the non-acceptance values
between [-1,0] and [0,1] converges precisely
with the level of fixation [-0.5.0] and [0,0.5]
alternatively by using the uncertain values in
decision making process of the human behaviours
in mathematical Analysis. |
|
 |
|
Cite: Anthoni Amali A, J . Jesintha Rosline,
Aruna G ALTERNATE QUADRA-SUBMERGING POLAR FUZZY
GRAPH AND ITS DECISION MAKING ANALYSIS.
Reliability: Theory & Applications. 2025, March
1(82):157-171. DOI: https://doi.org/10.24412/1932-2321-2025-182-157-171
|
|
|
|
A PRODUCTION INVENTORY MODEL FOR
DETERIORATING ITEMS WITH TIME AND PRICE RELIANT
DEMAND USING FLOWER POLLINATION OPTIMIZATION |
172-188 |
|
|
Amit
Kumar, Ajay Singh
Yadav, Dharmendra Yadav |
|
|
|
Effective management of production inventory for
deteriorating items with dynamic demand patterns
is crucial for businesses operating in today’s
competitive markets. This paper proposes a
comprehensive model that addresses the
complexities arising from the dual storage
locations, item deterioration, and demand
dependencies on both time and selling price. To
optimize the decision variables associated with
production and inventory control, we employ the
Flower Pollination Optimization (FPO) algorithm,
a nature-inspired meta-heuristic known for its
ability to efficiently navigate complex search
spaces. The two-storage production inventory
model integrates the dynamics of item
deterioration over time, capturing the
real-world challenges faced by supply chain
managers. The demand for items is modeled to be
sensitive to both temporal variations and
changes in selling prices, reflecting the
intricate nature of market dynamics. Our
approach leverages the FPO algorithm to explore
and exploit the solution space, allowing for the
identification of optimal or near-optimal
strategies for production quantities, order
quantities, and inventory levels. The FPO
algorithm mimics the pollination process in
nature, striking a balance between exploration
and exploitation to efficiently search for
solutions in a highly dynamic and nonlinear
environment. The proposed model and optimization
approach are validated through extensive
simulations and sensitivity analyses. The
results demonstrate the effectiveness of the FPO
algorithm in finding robust solutions that
enhance inventory management, mitigate
deterioration-related losses, and adapt to
varying demand scenarios. This research
contributes to the field of supply chain
optimization by offering a novel perspective on
tackling the challenges associated with dual
storage, item deterioration, and demand
dependencies. The findings provide valuable
insights for practitioners seeking advanced
strategies for optimizing their production
inventory systems in the face of evolving market
conditions. |
|
 |
|
Cite: Amit kumar, Ajay Singh Yadav,
Dharmendra Yadav A PRODUCTION INVENTORY MODEL
FOR DETERIORATING ITEMS WITH TIME AND PRICE
RELIANT DEMAND USING FLOWER POLLINATION
OPTIMIZATION. Reliability: Theory & Applications.
2025, March 1(82):172-188. DOI: https://doi.org/10.24412/1932-2321-2025-182-172-188
|
|
|
|
A FAILURE DISTRIBUTION FOR
RELIABILITY PREDICTION OF MECHATRONIC COMPONENTS
AND HUMAN-MACHINE SYSTEM |
189-197 |
|
|
Iftikhar Chalabi |
|
|
|
Modern machines and equipment’s have a complex
mechatronic structure consisting of various
components, and their reliability depends on a
large number of random factors that arise during
design, production and operation, which are
often impossible to predict. Each element of the
modern machines is characterized by different
performance criteria and corresponding failures.
Various statistical models of failure
distribution are widely used to quantify the
reliability of machines and devices. The choice
of a statistical model and its parameters is
important for a proper assessment of reliability.
The chosen statistical model should reflect the
actual distribution of failures fairly correctly.
In presented article is proposed a new failure
distribution for reliability prediction of
mechatronic components of modern machines and
human-machine systems. A large number of sudden
failures of modern complex technical facilities
containing electronic and mechatronic structural
elements seriously affect its λ-characteristic.
Various studies have already shown that the
failure behavior of complex systems cannot
always be characterized by the "bathtub curve".
This is especially true for modern complex
machines, which, among other things, consist of
numerous electronic components for which no wear
and fatigue failures are assumed. For this
reason, an alternative service life distribution
for the description failure behavior of modern
mechatronic components and human-machine systems
is proposed. This is about the failure curves,
which are initially characterized by a low or
high failure rate and then tend to a constant
failure rate. To determine the reliability
indexes are provided analytical formulas.
Methods for estimating the parameters of this
distribution are presented based on failure
statistic. To determine distribution parameters,
statistical data on failures of the technical
system are sufficient only in the first period
of its operation. This is one of the main
advantages of the presented distribution. On the
example of practical cases, the hypothesis of
compliance of the proposed theoretical
distribution to the actual statistical data on
failures of various mechatronic systems and
human-machine system was tested. |
|
 |
|
Cite: Iftikhar Chalabi A FAILURE
DISTRIBUTION FOR RELIABILITY PREDICTION OF
MECHATRONIC COMPONENTS AND HUMAN-MACHINE SYSTEM
. Reliability: Theory & Applications. 2025,
March 1(82):189-197. DOI: https://doi.org/10.24412/1932-2321-2025-182-189-197
|
|
|
|
MODERN APPROACHES TO MODELING
RELIABLE AND EFFICIENT WATER SUPPLY SYSTEMS |
198-205 |
|
|
M.T.
Babayev, N.V. Budagova |
|
|
|
The
reliability of water supply systems plays a
crucial role in ensuring sustainable water use,
minimizing economic losses, and preventing
failures in critical infrastructure. This paper
proposes a mathematical approach to modeling the
reliability of water systems based on
probability theory and Markov processes. The
main types of failures, their impact on
operational characteristics, and economic
consequences are examined. A simulation of the
water supply network is conducted, considering
the probabilistic characteristics of failures
and recovery processes. The analysis of results
demonstrates that the implementation of
predictive monitoring methods and the
optimization of maintenance strategies
significantly enhance the resilience of water
supply systems. The developed model can be
applied in the planning of modernization and
management of water supply infrastructure to
improve its efficiency and economic feasibility. |
|
 |
|
Cite: M.T. Babayev, N.V. Budagova MODERN
APPROACHES TO MODELING RELIABLE AND EFFICIENT
WATER SUPPLY SYSTEMS . Reliability: Theory &
Applications. 2025, March 1(82):198-205. DOI: https://doi.org/10.24412/1932-2321-2025-182-198-205
|
|
|
|
COMPARATIVE BAYESIAN ANALYSIS OF
THE INVERSE TOPP-LEONE DISTRIBUTION |
206-218 |
|
|
Aijaz
Ahmad, Fathima Bi, Mahfooz Alam, Aafaq A. Rather,
Danish Qayoom, Asgar Ali |
|
|
|
This
paper focuses on the Bayesian estimation of the
shape parameter for the Inverse Topp-Leone (ITL)
distribution. To achieve this, we employ both
the extended Jeffrey’s prior and the gamma prior,
facilitating the derivation of posterior
distributions for the shape parameter. The
Bayesian estimators are calculated under various
loss functions, including the squared error loss
function (SELF), entropy loss function (ELF),
precautionary loss function (PLF), and Linex
loss function (LLF), each chosen to address
different practical scenarios and estimator
biases. In addition to the Bayesian approach, we
also explore maximum likelihood estimation (MLE)
to provide a comparative benchmark. The
performance of these estimators is assessed and
compared based on mean squared error (MSE)
across multiple sample sizes, allowing for a
detailed evaluation of estimator robustness and
accuracy. A real-world dataset is then analyzed
to further demonstrate the relative efficiency
of each estimator under the different loss
functions, providing practical insights into the
applicability of each estimation approach for
the ITL distribution. This analysis offers a
comprehensive perspective on the versatility and
precision of Bayesian and classical estimation
methods for the ITL model. |
|
 |
|
Cite: Aijaz Ahmad, Fathima Bi, Mahfooz Alam,
Aafaq A. Rather, Danish Qayoom, Asgar Ali
COMPARATIVE BAYESIAN ANALYSIS OF THE INVERSE
TOPP-LEONE DISTRIBUTION . Reliability: Theory &
Applications. 2025, March 1(82):206-218. DOI: https://doi.org/10.24412/1932-2321-2025-182-206-218
|
|
|
|
BAYESIAN SPATIAL TEMPORAL TREND
ANALYSIS FOR DECISION MAKING AND RISK ASSESSMENT
IN DENGUE INCIDENCE STUDIES: A CASE OF TAMILNADU |
219-226 |
|
|
Jaisankar Ramasamy, Ranjani Murugesan |
|
|
|
This
study presents a Bayesian spatial-temporal
analysis for studying Dengue incidence in Tamil
Nadu, aiming to provide insights into
decision-making and risk assessment strategies.
Statistical models that allow a more accurate
depiction of true disease rates by borrowing
information from neighboring regions will help
mitigate the effects of sparsely populated
regions and deliver better inference. Perhaps
the most conspicuous manner of modeling spatial
dependence is to introduce spatially associated
random effects within a Bayesian hierarchical
setting. The Bayesian modeling and inferential
framework are flexible and extremely rich in its
capabilities to accumulate various scientific
hypotheses and assumptions. The spatial and
spatial temporal epidemiology is concerned with
the description and analysis of spatial and
spatial temporal variations in disease risk with
respect to risk factors. As the primary aim of
this work is to quantify the spatial disease
pattern of dengue incidences apart from the
mapping of disease modelling the disease and
finding spatial clusters/hotpots is one
important aspect in epidemiology is to find the
temporal trends in or outside of clusters. In
this study, a spatial-temporal trends model is
fitted using the Leroux CAR prior’s set up for
studying the spatial-temporal disease patterns
with the estimation of the temporal trends with
reference to dengue incidences in Tamil Nadu,
India. |
|
 |
|
Cite: Jaisankar Ramasamy, Ranjani Murugesan
BAYESIAN SPATIAL TEMPORAL TREND ANALYSIS FOR
DECISION MAKING AND RISK ASSESSMENT IN DENGUE
INCIDENCE STUDIES: A CASE OF TAMILNADU .
Reliability: Theory & Applications. 2025, March
1(82):219-226. DOI: https://doi.org/10.24412/1932-2321-2025-182-219-226
|
|
|
|
OPTIMIZATION OF RESOURCE
ALLOCATION USING INTEGER PROGRAMMING OF IMPROVED
RATIO ESTIMATOR UNDER STRATIFIED RANDOM SAMPLING |
227-241 |
|
|
Bhatt
Ravi Jitendrakumar, Monika Saini, Ashish Kuma,
Yashpal Singh Raghav |
|
|
|
This
paper provides a case study that illustrates how
integer programming may be used to optimize
resource allocation. With the known population
median of the study variable acting as auxiliary
data, an exponential ratio estimator is shown
for estimating the finite population mean under
stratified random sampling. The objective is to
minimize a cost function within specific bounds.
Using integer programming techniques and the
Lagrange multiplier approach, we transform the
proposed problem into an optimization problem
with a linear cost function. This allows us to
propose an optimal way for minimizing total
costs while maintaining desired accuracy levels.
We found that the suggested estimator performed
better than methods involving stratified random
sampling. Additionally, a numerical example is
given to verify the theoretical conclusions for
real-world applications. We go over how the
problem was formulated, how to use LINGO
software to solve it, and the results. It is
advised to choose the estimator with the lowest
MSE in real-world stratified random sampling
situations. The strategy shows significant cost
savings and efficient use of resources. The
effectiveness of the recommended approach is
demonstrated by testing the methodology on both
simulated and real-world datasets. |
|
 |
|
Cite: Bhatt Ravi Jitendrakumar, Monika Saini,
Ashish Kuma, Yashpal Singh Raghav OPTIMIZATION
OF RESOURCE ALLOCATION USING INTEGER PROGRAMMING
OF IMPROVED RATIO ESTIMATOR UNDER STRATIFIED
RANDOM SAMPLING. Reliability: Theory &
Applications. 2025, March 1(82):227-241. DOI: https://doi.org/10.24412/1932-2321-2025-182-227-241
|
|
|
|
RELIABILITY ANALYSIS OF C-SECTION
WHERE STRENGTH AND HEAR STRESS ARE NORMALLY
DISTRIBUTED |
242-252 |
|
|
T.
Raja jithendar, M. TirumalaDevi, K. Sandhya |
|
|
|
The
failure of a component depends on many
parameters, such as complexity, time, design,
reliability of components, and operating
conditions. If failure depends on the stress of
a component, such reliability models are called
stress dependent models. There are many types of
stresses that occur in the body, like tensile,
compressive, shear, and bending. Shear stress
develops in a body when a pair of opposite
forces act across the section tangentially. In
structural design, the choice of section shapes
for different components is crucial for
efficiency, strength, and stability. That’s why
C –sections are used as purlins. C-sections have
a shape that allows for effective load
distribution. In this paper, reliability
analysis has been conducted over the C-section
by applying load and finding the shear stress in
the flange and web of C-section. It is observed
from the computations that reliability decreases
as the load and overall depth of the section
increase. Reliability increases as the thickness
and width of the web increase. |
|
 |
|
Cite: T. Raja jithendar, M. TirumalaDevi, K.
Sandhya RELIABILITY ANALYSIS OF C-SECTION WHERE
STRENGTH AND HEAR STRESS ARE NORMALLY
DISTRIBUTED . Reliability: Theory & Applications.
2025, March 1(82):242-252. DOI: https://doi.org/10.24412/1932-2321-2025-182-242-252
|
|
|
|
AN ALGORITHM FOR CONDITIONAL
EXTREME VALUE THEORY GARCH-EVT TECHNIQUE FOR
ESTIMATING VALUE AT RISK |
253-276 |
|
|
K.M.
Sakthivel, V. Nandhini |
|
|
|
Extreme events in financial time series are
characterized by their low probability yet high
impact and they pose significant challenges in
financial risk management. This study aims to
model and forecast extreme events, with a
particular emphasis on Value at Risk (VaR)
estimation. It explores the concept of
conditional Extreme Value Theory (EVT) for
modeling volatility series to estimate VaR by
integrating Generalized Autoregressive
Conditional Heteroskedasticity (GARCH) models
with EVT, forming the GARCH-EVT approach. An
automated algorithm was developed to optimize
both model selection and threshold determination,
ensuring accurate estimation of VaR. This
automated procedure enhances the model selection
process by identifying the optimal GARCH model
and the most appropriate EVT threshold,
addressing the complexities inherent in modeling
extreme events. The comprehensive backtesting
procedures are used to assess the effectiveness
and precision of the algorithm in forecasting
VaR, along with a simulation that evaluates both
in-sample and out-of-sample performance of the
model and candidate thresholds across various
methods. The automated GARCH-EVT approach
demonstrates effectiveness in accurately
estimating VaR, providing a reliable and
efficient method for extreme risk assessment in
financial markets. This method streamlines the
process of model selection and threshold
optimization, contributing to improved risk
management in financial markets. |
|
 |
|
Cite: K.M. Sakthivel, V. Nandhini AN
ALGORITHM FOR CONDITIONAL EXTREME VALUE THEORY
GARCH-EVT TECHNIQUE FOR ESTIMATING VALUE AT RISK
. Reliability: Theory & Applications. 2025,
March 1(82):253-276. DOI: https://doi.org/10.24412/1932-2321-2025-182-253-276
|
|
|
|
STRATIFIED RANDOM SAMPLING WITH
RISK APPROACH |
277-289 |
|
|
Astha
Jain, Diwakar Shukla |
|
|
|
In
stratified random sampling, the sample size
allocation is a problem which is tackled by many
scientists and survey practitioners. Generally
the proportional allocation, Neyman allocation
and cost based allocation, are used to conduct
sample surveys for gathering information from
each strata. One can think of risk imposed on
the life of investigators which is yet not
considered while sample size allocation to risky
strata. In this paper, the risk indicators
stratum-wise are defined using police station
records and hospital records. Such indicators
are used for the determination of sample size
allocation. For optimization, the Lagrange
multiplier technique is used with two constants
whose values need to be determined. An algorithm
is proposed and analysed for such using
simulation. The outcome of analysis provides
that sample size allocation is directly
proportional to the strata size and variability
but inversely proportional to the square root of
risk indicators of the stratum (with varying
values of constants). This paper opens a new
approach for the consideration of risk based
sample size allocation and estimation in the
setup of stratified sampling. |
|
 |
|
Cite: Astha Jain, Diwakar Shukla STRATIFIED
RANDOM SAMPLING WITH RISK APPROACH. Reliability:
Theory & Applications. 2025, March
1(82):277-289. DOI: https://doi.org/10.24412/1932-2321-2025-182-277-289
|
|
|
|
DIGITAL INVENTORY: REFORMAT RISK
OPTIMIZATION MODEL FOR A LAPTOP |
290-300 |
|
|
Diwakar Shukla, Deepti Sahu |
|
|
|
In
recent times, due to advancements in
technologies specially in the computer world,
people face problem related to limited digital
capacity of a digital devices. Many reasons
exist such as unwanted or unnecessary files
stored in (a) System digital space (b) ROM space
(c) Working space for users and (d) Hard disk
space. By the regular use of a laptop, user
space and hard disk digital space get occupied
because of the creation of new files and new
folders at every moment. Such a situation
motivates for development of a digital inventory
model for digital space. This paper presents a
digital inventory model which is a useful tool
for laptop reformat risk minimization. Users
Categories are defined as per their intensive
professional involvements. Several graphs are
drawn showing the output analysis and importance
of the study. Theoretical findings are supported
by the numerical computations. It is found that
reformat risk is directly proportional to the
growth of file/folder creation in either of
categories. |
|
 |
|
Cite: Diwakar Shukla, Deepti Sahu DIGITAL
INVENTORY: REFORMAT RISK OPTIMIZATION MODEL FOR
A LAPTOP. Reliability: Theory & Applications.
2025, March 1(82):290-300. DOI: https://doi.org/10.24412/1932-2321-2025-182-290-300
|
|
|
|
ENHANCING PATTERN SEQUENCE-BASED
FORECASTS: A MODIFIED STRATEGY RELATIVE TO
ELECTRICAL LOAD |
301-311 |
|
|
Suseelatha Annamareddi, Sudheer Gopinathan |
|
|
|
A
precise forecast of the one-day-ahead load is
essential for the efficient management of modern
power system operations. This paper proposes a
univariate model for short term load forecasting
(STLF) that improves the precision of the
Pattern sequence forecasting (PSF) algorithm. An
analysis was conducted to identify the
underlying patterns in the electrical load data
using Kmeans clustering and hierarchical
clustering algorithms. The results demonstrate
the efficacy of hierarchical clustering. The
limitations of the original PSF algorithm,
particularly in its clustering and prediction
phases are addressed using hierarchical
clustering and a new weighted average formula.
The proposed method was validated using
real-time series datasets and its performance
was compared with those of three pattern
sequence-based forecasting models. The
performance is further evaluated on two
electricity demand data sets and compared with
bench mark models. The uncertainty and
reliability of the forecast model was assessed
using an error variance metric. The results show
the superior forecast accuracy of the model. |
|
 |
|
Cite: Suseelatha Annamareddi, Sudheer
Gopinathan ENHANCING PATTERN SEQUENCE-BASED
FORECASTS: A MODIFIED STRATEGY RELATIVE TO
ELECTRICAL LOAD. Reliability: Theory &
Applications. 2025, March 1(82):301-311. DOI: https://doi.org/10.24412/1932-2321-2025-182-301-311
|
|
|
|
EXPONENTIATED POISSON-G FAMILY OF
DISTRIBUTION: SUB-MODELS, PROPERTIES, ESTIMATION
WITH REAL-LIFE APPLICATION |
312-323 |
|
|
Habibah Rahman, Tanusree Deb Roy |
|
|
|
This
study proposes a new family of distributions. A
study is done on some of its basic
characteristics, such as quantile, skewness,
kurtosis, hazard rate function, moments, mean
deviations, availability and reliability
function of successive linear and circular
systems, mean time to failure, mean time between
failure, and availability, Bonferroni and Lorenz
curves, and entropies. Two unique models of the
new family are studied in depth once the general
class is introduced. The special basis models
have been taken from the exponential and Fréchet
distributions. The parameters of the model are
estimated using maximum likelihood techniques.
There is a thorough analysis of percentage
points. Three unique real data sets are used to
demonstrate the significance of the new family.
A comparison is drawn between the suggested
distribution family and well-known two-, three-,
and four-parameter components. To model actual
data, it can be used as an alternative model to
various lifetime distributions found in the
statistical literature. |
|
 |
|
Cite: Habibah Rahman, Tanusree Deb Roy
EXPONENTIATED POISSON-G FAMILY OF DISTRIBUTION:
SUB-MODELS, PROPERTIES, ESTIMATION WITH
REAL-LIFE APPLICATION . Reliability: Theory &
Applications. 2025, March 1(82):312-323. DOI: https://doi.org/10.24412/1932-2321-2025-182-312-323
|
|
|
|
IMPROVED ADAPTIVE THRESHOLDING
LASSO CHART FOR MONITORING DISPERSION OF
HIGH-DIMENSIONAL PROCESSES USING GENERALIZED
MULTIPLE DEPENDENT STATE SAMPLING |
324-338 |
|
|
Mehrdad Hajiesmaeili, Mohammad Reza Maleki, Ali
Salmasnia |
|
|
|
In
many applications of multivariate statistical
quality control, it is commonly observed that
the number of quality characteristics exceeds
the sample size. This poses significant
challenges in monitoring high-dimensional data.
In such conditions, it is challenging to detect
sparse changes where an assignable cause leads
to the deviation of only a few elements in the
covariance matrix. On the other hand, the
utilization of the multiple dependent state (MDS)
sampling technique to enhance the sensitivity of
control charts has recently attracted the
attention of researchers. However, to the best
of the authors' knowledge, no previous research
has been conducted on equipping multivariate
dispersion control charting methods with the MDS
technique under high dimensionality. Therefore,
this article integrates the adaptive
thresholding Lasso statistic with the MDS and
generalized MDS techniques to track all types of
disturbances in the covariance matrix of
high-dimensional processes, including diagonal,
off-diagonal, and joint diagonal/off-diagonal
deviations. The performance of the proposed
control charts will be compared through a
numerical example under seven out-of-control
patterns in terms of three metrics: average,
standard deviation, and median of run length.
The results clearly indicate that the use of
both sampling techniques significantly improves
the run length properties of the adaptive
thresholding Lasso chart. |
|
 |
|
Cite: Mehrdad Hajiesmaeili, Mohammad Reza
Maleki, Ali Salmasnia IMPROVED ADAPTIVE
THRESHOLDING LASSO CHART FOR MONITORING
DISPERSION OF HIGH-DIMENSIONAL PROCESSES USING
GENERALIZED MULTIPLE DEPENDENT STATE SAMPLING .
Reliability: Theory & Applications. 2025, March
1(82):324-338. DOI: https://doi.org/10.24412/1932-2321-2025-182-324-338
|
|
|
|
A NEUTROSOPHIC FUZZY ACCEPTANCE
SAMPLING PLAN BASED ON NEGATIVE BINOMIAL
DISTRIBUTION |
339-349 |
|
|
Jayalakshmi S, Gopinath M |
|
|
|
This
paper suggests a novel method for acceptance
sampling that integrates neutrosophical fuzzy
logic with the negative binomial distribution.
The complexity and ambiguity that characterize
real-world circumstances are typically
overlooked by traditional acceptance sampling
methodologies. The neutrosophic Fuzzy Acceptance
Sampling Plan (NFASP) incorporates the negative
binomial distribution, which is particularly
well-suited for count data, to account for
circumstances where defect occurrences are
important. The efficacy of the methodology is
demonstrated by theoretical study and
simulations. This innovative method lifts
acceptance sampling to a more accurate and
sophisticated procedure by dealing with
ambiguity and indeterminacy. |
|
 |
|
Cite: Jayalakshmi S, Gopinath M A
NEUTROSOPHIC FUZZY ACCEPTANCE SAMPLING PLAN
BASED ON NEGATIVE BINOMIAL DISTRIBUTION .
Reliability: Theory & Applications. 2025, March
1(82):339-349. DOI: https://doi.org/10.24412/1932-2321-2025-182-339-349
|
|
|
|
OPTIMIZING INVENTORY OF
DETERIORATING PRODUCTS WITH PRICE-DEPENDENT
DEMAND USING QUANTUM-BEHAVED AGTO VARIANTS |
350-362 |
|
|
Muragesh Math, D.Gopinath, B. S.Biradar |
|
|
|
Preservation of a product is an important issue
in the inventory control system. It prevents the
deterioration effect of the products while these
are stored in the warehouse/showroom.
Considering deterioration effect of the product
and preservation technology, an inventory model
of non-instantaneous deteriorating items is
developed with the demand dependent on the
selling price of the product. Two different
preservation rates are considered. Shortages are
allowed partially with two different backlogging
rates. Due to consideration of three-parameter
Weibull distributed deterioration and
preservation facility, the corresponding
optimization problems are highly nonlinear. So,
these problems cannot be solved analytically due
to nonlinearity. To overcome this situation,
different variants of quantum-behaved Artificial
Gorilla Troops Optimizer (AGTO) are used. To
illustrate and validate the proposed model, a
numerical example is considered and solved for
each case, and compared the results with the
different variants of AGTO algorithms. Finally,
a sensitivity analysis is performed to study the
effect of changes of different parameters of the
model on the optimal policy. |
|
 |
|
Cite: Muragesh Math, D.Gopinath, B.
S.Biradar OPTIMIZING INVENTORY OF DETERIORATING
PRODUCTS WITH PRICE-DEPENDENT DEMAND USING
QUANTUM-BEHAVED AGTO VARIANTS. Reliability:
Theory & Applications. 2025, March
1(82):350-362. DOI: https://doi.org/10.24412/1932-2321-2025-182-350-362
|
|
|
|
APPLICATION OF FUZZY LOGIC IN
AGRICULTURAL NETWORK ANALYSIS FOR OPTIMIZING
CROP PRODUCTION |
363-372 |
|
|
Mushtaq A. Lone, S. A. Mir, Sushil Kumar, Aafaq
A. Rather, Danish Qayoom, S. Ramki |
|
|
|
This
study investigates the application of fuzzy
logic and fuzzy set theory in agricultural
networking to identify the optimal paths for
different crop production activities.
Traditionally networking methods often face
challenges with incomplete and uncertain data,
which are prevalent in agriculture. Fuzzy logic
using decagonal fuzzy number offers a more
versatile method of handing imprecise data. In
this study decagonal fuzzy numbers are
defuzzified by rolling averages with a window of
three to determine the optimal path. The
solution of the formulated mathematical
programming model is obtained using R software
which enabling accurate computation of the best
routes in agricultural networks and three
different examples were taken and the network
diagram is also shown. This paper further shows
the scope of agriculture especially network path
analysis in agriculture which can enhance
decision making, which in turn can rise crop
yields and improve agriculture productivity. |
|
 |
|
Cite: Mushtaq A. Lone, S. A. Mir, Sushil
Kumar, Aafaq A. Rather, Danish Qayoom, S. Ramki
APPLICATION OF FUZZY LOGIC IN AGRICULTURAL
NETWORK ANALYSIS FOR OPTIMIZING CROP PRODUCTION
. Reliability: Theory & Applications. 2025,
March 1(82):363-372. DOI: https://doi.org/10.24412/1932-2321-2025-182-363-372
|
|
|
|
A GENERALIZED POWER SUJATHA
DISTRIBUTION WITH PROPERTIES AND APPLICATIONS |
373-387 |
|
|
Hosenur Rahman Prodhani, Rama Shanker |
|
|
|
This
paper introduces a generalized power Sujatha
distribution as an extension of the
two-parameter generalization of Sujatha
distribution, initially proposed for analyzing
and modeling lifetime data in medical and
engineering fields. The existing generalization
of Sujatha distribution, being two-parameter,
may not always provide a satisfactory fit for
certain lifetime data from both theoretical and
practical perspectives. The generalized power
Sujatha distribution is presented as a
comprehensive model, encompassing both the
Generalization of Sujatha distribution and the
Sujatha distribution as particular cases,
specifically for the analysis of data in medical
and engineering domains. The paper delves into
the statistical properties of the proposed
distribution, examining the behavior of its
probability density function and cumulative
distribution function across varying parameter
values. Additionally, the first four raw moments
of the distribution are derived and provided.
The expressions for the hazard rate function and
mean residual life function are obtained, and
their behaviors under different parameter values
are discussed. Stochastic ordering, a valuable
tool for comparing stochastic nature, is also
explored. The method of maximum likelihood is
discussed for parameter estimation, and a
simulation study is conducted to assess the
performance of maximum likelihood estimates as
sample sizes increase. To validate the
applicability of the distribution, two real
lifetime data sets from medical and engineering
fields are analyzed. The goodness of fit of the
generalized power Sujatha distribution is
evaluated using the Akaike Information criterion
and Kolmogorov-Smirnov statistic. The results
demonstrate that the proposed distribution
offers a closer fit compared to three-parameter
power Quasi Lindley distribution,
Three-parameter Sujatha distribution,
Generalized gamma distribution, and
two-parameter Generalizations of Sujatha
distribution, as well as Weibull distribution
and one-parameter Sujatha distribution. Given
its superior fit over Power Quasi Lindley and
Weibull distributions, particularly in the
context of modeling and analyzing data from
medical and engineering fields, the paper
concludes by recommending the generalized power
Sujatha distribution as the preferred choice
over the considered distributions for such
applications. |
|
 |
|
Cite: Hosenur Rahman Prodhani, Rama Shanker
A GENERALIZED POWER SUJATHA DISTRIBUTION WITH
PROPERTIES AND APPLICATIONS . Reliability:
Theory & Applications. 2025, March
1(82):373-387. DOI: https://doi.org/10.24412/1932-2321-2025-182-373-387
|
|
|
|
RELAY CONTACTOR SYSTEM AS A MEANS
OF CONTROLLING A LINEAR ELECTRIC DRIVE |
388-396 |
|
|
G.S.
Kerimzade, G.V. Mamedova |
|
|
|
The
energy sector is currently undergoing rapid
change as a result of advances in technology,
changes in consumer demand and the desire for
more sustainable and efficient energy sources.
Against the background of these changes, the
problems of process management and optimization
in the energy system are particularly relevant.
One of the main directions in this field is the
application of control systems through
different-purpose control apparatus that can
effectively react to changes in the environment
and dynamically adapt to new conditions. The
future development of the theory and practice of
automatic control is related to the
determination of the maximum possibilities of
the systems and their construction, which are
the best according to any technical and economic
indicator. It is the research and development of
control systems through apparatus in the energy
sector, taking into account modern requirements
and technological possibilities. Control systems
are widely used in various fields of technology,
they are applied in the automation of production
processes and calculations. Positive results are
obtained when simulating the system using
different parameter values for different types
of interference signals. Management systems with
the use of hardware can be successfully applied
in the real working conditions of energy
enterprises and can ensure optimal use of
resources, reduction of operating costs and
minimization of negative effects on the
environment. This article discusses the
characteristics of relay-contactor control
systems. Relay contactor equipment controls
electric drives powered by electric motors from
a network with a constant voltage, which are
widely used in all industries. Relay-contactor
control systems are control systems built on a
relay-contactor element base and designed to
automate the operation of engines. With the help
of such control systems, operations such as
turning the engine on and off, choosing the
direction and speed of rotation, starting and
braking the engine, creating temporary pauses in
movement, protective shutdown of the engine and
stopping the mechanism are automated. These
operations are necessary to perform the movement
of the working body of the mechanism according
to technological conditions. An electric drive,
made on the basis of a relay-contactor control
system, is a simple, unregulated electric drive
of direct or alternating current, mainly for
general industrial use, for example, electric
drive of cranes, elevators, conveyors, fans,
pumps, some transport devices, etc. |
|
 |
|
Cite: G.S. Kerimzade, G.V. Mamedova RELAY
CONTACTOR SYSTEM AS A MEANS OF CONTROLLING A
LINEAR ELECTRIC DRIVE . Reliability: Theory &
Applications. 2025, March 1(82):388-396. DOI: https://doi.org/10.24412/1932-2321-2025-182-388-396
|
|
|
|
KERNEL SMOOTHING OF THE MEAN
PERFORMANCE FOR HOMOGENEOUS CONTINUOUS TIME
SEMI-MARKOV PROCESS |
397-412 |
|
|
Tayeb Hamlat, Fatiha Mokhtari, Saadia Rahmani |
|
|
|
The main goal of the present paper is to propose
a systematic approach to model performance
measurements within the context of
continuous-time semi-Markov processes with a
finite state space. Specifically, the mean
performance is estimated using the kernel method.
The uniform strong consistency and the
asymptotic normality of the proposed estimator
is investigated. Furthermore, a non-parametric
kernel estimation of the expected cumulative
operational time is addressed. The constructed
estimator is proved to be consistent and to
converge to a normal random variable as the time
of observation becomes large. As an illustration
example, a simulation study has been conducted
in order to highlight the efficiency as well as
the superiority of our method to the standard
empirical method. |
|
 |
|
Cite: Tayeb Hamlat, Fatiha Mokhtari,
Saadia Rahmani KERNEL SMOOTHING OF THE MEAN
PERFORMANCE FOR HOMOGENEOUS CONTINUOUS TIME
SEMI-MARKOV PROCESS. Reliability: Theory &
Applications. 2025, March 1(82):397-412. DOI: https://doi.org/10.24412/1932-2321-2025-182-397-412
|
|
|
|
CHARACTERIZATION OF SOME
GENERALIZED DISTRIBUTIONS USING ORDER STATISTICS |
413-424 |
|
|
Haseeb Athar, Mohd. Amir |
|
|
|
The Lindley distribution has been useful for
fitting lifetime data. In recent times, several
authors studied the extension of the original
Lindley distribution. In this paper, we
introduced the two general classes of
distributions, which include all earlier
versions of Lindley distributions. These general
classes are characterized using conditional
expectations of order statistics. Further, there
results are applied to characterize several
known distributions like Lindley, X-Lindley,
power Lindley, Lindley-Pareto, Ailamujia, power
Ailamujia, Lindley-Weibull, length-biased
exponential, inverse Lindley, inverse power
Lindley and inverted length biased exponential
distributions. |
|
 |
|
Cite: Haseeb Athar, Mohd. Amir
CHARACTERIZATION OF SOME GENERALIZED
DISTRIBUTIONS USING ORDER STATISTICS.
Reliability: Theory & Applications. 2025, March
1(82):413-424. DOI: https://doi.org/10.24412/1932-2321-2025-182-413-424
|
|
|
|
CONSTRUCTION OF GAMMA
ZERO-INFLATED POISSON DOUBLE SAMPLING PLANS |
425-438 |
|
|
Priyadharshini R, Shalini K |
|
|
|
In a well-supervised production framework,
non-conformities occur seldom, resulting in a
more number of zeros in the count of
non-conformities. The zero-inflated Poisson (ZIP)
distribution is a suitable model for handling
zero inflation. Double sampling plan (DSP) is a
precise quality inspection method where a
decision on the approval or rejection of a lot
is made after reviewing two samples, providing
stronger conclusions than single sampling plan (SSP).
In practice, decision-making for submitted lots
requires a consistent assessment of both
within-lot and between-lot variations, which can
be addressed using Bayesian methodology. A
Bayesian approach integrates prior knowledge and
provides more information for making decisions
about the approval or rejection of a lot. This
article focuses on the designing of Bayesian
DSPs; employing a Gamma prior to the parameter
in the Poisson component of ZIP distribution the
operating characteristic (OC) function is
derived. Examples are provided to assess
Gamma-ZIP (GZIP) DSPs. The significance of GZIP
DSPs over conventional ZIP DSPs is also
presented. |
|
 |
|
Cite: Priyadharshini R, Shalini K
CONSTRUCTION OF GAMMA ZERO-INFLATED POISSON
DOUBLE SAMPLING PLANS . Reliability: Theory &
Applications. 2025, March 1(82):425-438. DOI: https://doi.org/10.24412/1932-2321-2025-182-425-438
|
|
|
|
A STUDY ON COMPARISON OF
VARIOUS CONTINUOUS SAMPLING AND SKIP-LOT
SAMPLING PLAN PROCEDURES |
439-444 |
|
|
S. Suganya, K. Pradeepa Veerakumari |
|
|
|
This paper explains the brief review of skip-lot
sampling plan procedures followed by continuous
sampling plan procedures. Also, various types of
skip-lot sampling plans are compared with
continuous sampling plans. The efficiency of
SkSP-T is tested on comparison with various
skip-lot sampling plans using Single Sampling
Plan. A new system of skip-lot sampling plan of
type SkSP-T is compared with other skip-lot
sampling plans. Different types of skip-lot
sampling plans namely SkSP-2, SkSP-3, SkSP-V and
SkSP-R. The tables are constructed for various
combinations of various parameters using various
numerical methods. |
|
 |
|
Cite: S. Suganya, K. Pradeepa Veerakumari
A STUDY ON COMPARISON OF VARIOUS CONTINUOUS
SAMPLING AND SKIP-LOT SAMPLING PLAN PROCEDURES .
Reliability: Theory & Applications. 2025, March
1(82):439-444. DOI: https://doi.org/10.24412/1932-2321-2025-182-439-444
|
|
|
|
DECISION SUPPORT SYSTEM OF
EVAPORATING SYSTEM OF SUGAR PLANT |
445-453 |
|
|
Parveen Sihmar, Vikas Modgil |
|
|
|
This paper addresses an analysis methodology for
assessing the efficacy of a evaporating system
in a sugar industry. A stochastic Petri nets
technique is employed to simulate the
interactions between the subsystems. A software
package, "Petri module," from GRIF, was licensed.
The performability of subsystems has been
evaluated, and fluctuations in repair and
failure rates have been observed. The
maintenance order priority was assigned to the
subsystems of the evaporating system based on
the criticality of failure. Finally, a decision
support system is implemented to assist
maintenance personnel in making more informed
decisions during the development of maintenance
policies. It has been noted that the evaporator
is an essential component that requires the
complete attention of the plant manager. |
|
 |
|
Cite: Parveen Sihmar, Vikas Modgil
DECISION SUPPORT SYSTEM OF EVAPORATING SYSTEM OF
SUGAR PLANT . Reliability: Theory & Applications.
2025, March 1(82):445-453. DOI: https://doi.org/10.24412/1932-2321-2025-182-445-453
|
|
|
|
MODELING RELIABILITY IN
k-OUT-OF-m SYSTEMS WITH UNEQUAL LOAD SHARING
USING PROPORTIONAL CONDITIONAL REVERSE HAZARD
RATE |
454-471 |
|
|
Sukumar V. Rajguru, Santosh. S. Sutar |
|
|
|
This paper explores a load-sharing model within
a k-out-of-m system, where multiple components
work together to handle a shared load. Such
systems are prevalent in various engineering and
industrial applications. While previous studies
have focused on equal load-sharing rules, this
research emphasizes systems operating under an
unequal load-sharing rule, which has a
significant impact on the system’s reliability
and performance. Specifically, the paper
examines a k-out-of-m load-sharing system
modeled using the proportional conditional
reverse hazard rate model, incorporating unequal
load sharing. We have derived expressions for
the probability density function and cumulative
distribution function of system failure. To
illustrate the model, they use a 2-out-of-4
configuration with Weibull baseline
distributions. The maximum likelihood estimation
method is employed to estimate the model
parameters, and the performance of these
estimates is evaluated through a simulation
study, assessing both bias and mean square
errors. Additionally, the practical
applicability of the model is demonstrated
through the analysis of two real datasets. |
|
 |
|
Cite: Sukumar V. Rajguru, Santosh. S.
Sutar MODELING RELIABILITY IN k-OUT-OF-m SYSTEMS
WITH UNEQUAL LOAD SHARING USING PROPORTIONAL
CONDITIONAL REVERSE HAZARD RATE. Reliability:
Theory & Applications. 2025, March
1(82):454-471. DOI: https://doi.org/10.24412/1932-2321-2025-182-454-471
|
|
|
|
IMPROVING VARIANCE PRECISION
IN POPULATION STUDIES: THE ROLE OF
POST-STRATIFICATION AND AUXILIARY DATA |
472-482 |
|
|
M. I. Khan, S. Qurat Ul Ain, M. Younis Shah |
|
|
|
In this study, we propose an enhanced estimator
for the finite population variance in the
context of post-stratified sampling,
incorporating an auxiliary variable to improve
accuracy. We derive expressions for the bias and
mean square error (MSE) of the proposed
estimator, providing an approximation accurate
up to the first order. The theoretical analysis
highlights the conditions under which the
proposed estimator yields lower bias and reduced
MSE, making it a more efficient alternative to
traditional methods. To evaluate the practical
performance of this estimator, we apply it to
two real-world data sets, where our results
demonstrate a marked improvement in efficiency
over existing estimators. The numerical findings
confirm that, in post-stratified sampling, the
proposed estimator significantly enhances the
precision of variance estimation, especially
when the auxiliary variable is highly correlated
with the study variable. This work not only
contributes a more efficient estimator but also
provides valuable insights into the application
of auxiliary information in post-stratified
sampling designs. |
|
 |
|
Cite: M. I. Khan, S. Qurat Ul Ain, M.
Younis Shah IMPROVING VARIANCE PRECISION IN
POPULATION STUDIES: THE ROLE OF
POST-STRATIFICATION AND AUXILIARY DATA .
Reliability: Theory & Applications. 2025, March
1(82):472-482. DOI: https://doi.org/10.24412/1932-2321-2025-182-472-482
|
|
|
|
A COMPARATIVE STUDY ON
PARAMETER ESTIMATION TECHNIQUES FOR THE DISCRETE
INVERSE RAYLEIGH DISTRIBUTION |
483-492 |
|
|
Haripriya M, Radhika A, Jeslin J |
|
|
|
This article explores into the Discrete Inverse
Rayleigh Distribution, a novel discrete analogue
of the continuous Inverse Rayleigh distribution,
formulated by inverting a continuous Rayleigh
random variable. The Discrete Inverse Rayleigh
Distribution can effectively capture a range of
hazard rate shapes, exhibiting either unimodal
or monotonic decreasing behaviors depending on
parameter values. To estimate the parameters of
this distribution, we examine four distinct
methods: a heuristic algorithm, a probability
paper plotting technique designed for the
Inverse Rayleigh, the method of moments, and the
method of proportions. Each method offers unique
strengths and presents different computational
requirements and precision levels. Through
rigorous simulation studies, we assess the
accuracy and reliability of these methods,
evaluating their performance across a variety of
scenarios. Our results indicate that the methods
of moments and proportions encounter significant
difficulties when estimating parameters for
right-skewed Discrete Inverse Rayleigh
distributions. These challenges are primarily
due to numerical instability and poor
convergence properties under certain parameter
configurations, which can limit their practical
applicability in these cases. In contrast, both
the probability paper plotting method and the
heuristic algorithm demonstrate robustness and
enhanced accuracy, especially in the context of
right-skewed distributions. The probability
paper plot is notably effective due to its
reliance on graphical techniques that simplify
parameter estimation in complex, non-monotonic
datasets, whereas the heuristic algorithm
provides a more computationally efficient
solution without sacrificing precision. To
validate the utility of the Discrete Inverse
Rayleigh Distribution, we compare its
performance with the Discrete Rayleigh
Distribution by fitting both models to a
real-world dataset. The comparative analysis
leverages the Akaike Information Criterion (AIC)
to quantitatively assess model fit. Our findings
underscore the advantages of the Discrete
Inverse Rayleigh Distribution, particularly in
applications where discrete data exhibits
non-monotonic hazard rates, highlighting its
superior fit over the traditional Discrete
Rayleigh in this context. This study contributes
to the growing toolkit for discrete
time-to-event data modeling, offering insights
into effective parameter estimation strategies
and demonstrating the value of the Discrete
Inverse Rayleigh Distribution for specialized
discrete hazard rate analysis. |
|
 |
|
Cite: Haripriya M, Radhika A, Jeslin J A
COMPARATIVE STUDY ON PARAMETER ESTIMATION
TECHNIQUES FOR THE DISCRETE INVERSE RAYLEIGH
DISTRIBUTION . Reliability: Theory &
Applications. 2025, March 1(82):483-492. DOI: https://doi.org/10.24412/1932-2321-2025-182-483-492
|
|
|
|
DESIGNING SINGLE SAMPLING
PLANS BASED ON ZERO-INFLATED BINOMIAL
DISTRIBUTION |
493-499 |
|
|
Sangeetha S, Shalini K, Hemalatha R |
|
|
|
Withdrawal |
|
|
|
|
|
|
|
LEVERAGING RANK SET SAMPLING
FOR ENHANCED STRESS-STRENGTH ESTIMATION IN THE
CONTEXT OF NAKAGAMI DISTRIBUTION |
500-514 |
|
|
Surinder Kumar, Rahul Shukla, Bhupendra Meena,
Shivendra Pratap Singh |
|
|
|
This study addresses the estimation of the
stress-strength reliability model, where stress
and strength both following the Nakagami
distribution. While conventional approaches have
relied on simple random sampling (SRS) for
estimating reliability models, recent research
suggests that ranked set sampling (RSS) offers a
more efficient alternative. RSS yields more
informative samples compared to SRS, potentially
enhancing the accuracy of reliability
estimations. Our investigation focuses on
deriving maximum likelihood estimators (MLEs)
for stress-strength under both SRS and RSS
methodologies. To evaluate the comparative
efficacy of these sampling techniques, we
conduct a comprehensive Monte Carlo simulation
study. The results of this analysis provide
compelling evidence that RSS-based estimators
outperform their SRS counterparts in terms of
efficiency and precision. This research
contributes to the growing body of literature
supporting the adoption of RSS in reliability
engineering. By demonstrating the superior
performance of RSS in the context of
Nakagami-distributed stress-strength models, we
offer valuable insights for researchers and
practitioners seeking to optimize their
estimation procedures in reliability analysis. |
|
 |
|
Cite: Surinder Kumar, Rahul Shukla,
Bhupendra Meena, Shivendra Pratap Singh
LEVERAGING RANK SET SAMPLING FOR ENHANCED
STRESS-STRENGTH ESTIMATION IN THE CONTEXT OF
NAKAGAMI DISTRIBUTION . Reliability: Theory &
Applications. 2025, March 1(82):500-514. DOI: https://doi.org/10.24412/1932-2321-2025-182-500-514
|
|
|
|
EVALUATION OF PARAMETRIC
ESTIMATION METHODS FOR THE GAMMA DISTRIBUTION
USING MAXIMUM LIKELIHOOD AND BAYESIAN APPROACHES
IN A CENSORED LIFE-TESTING STRATEGY WITH MARKOV
CHAIN MONTE CARLO SIMULATIONS |
515-527 |
|
|
Christian Akrong Hesse, Dominic Buer Boyetey,
Emmanuel Dodzi Kpeglo, Albert Ayi Ashiagbor |
|
|
|
The goal of this study was to address the
computational challenges associated with
parametric estimation of the gamma distribution
by evaluating the performance of the maximum
likelihood and maximum a-posteriori estimation
methods within the framework of Markov Chain
Monte Carlo simulations. This was done by first
assuming a censored life-testing strategy that
terminates on the rth failure from a given
sample of n electronic devices. Second, we
obtained the joint distribution function of the
first r-order statistic by arranging the r
values in order of magnitude. Finally, we
explored through the Markov Chain Monte Carlo
framework using the maximum likelihood and
maximum a-posteriori to estimate the gamma
distribution parameters. The findings of this
study suggest that both estimation methods were
not significantly different from the actual
hypothesized parameter values. Further, we
observed that irrespective of the prior
distribution used for the Bayesian maximum
a-posteriori Markov Chain Monte Carlo estimation,
the resulting parametric estimates of the gamma
distribution remain the same, confirming the
assertion that the Bayesian maximum a-posteriori
Markov Chain Monte Carlo approach is a valuable
tool for informative posterior analysis. The
study’s uniqueness lies in adopting a censored
life-testing strategy centered on the joint
distribution function of the first r-order
statistic. |
|
 |
|
Cite: Christian Akrong Hesse, Dominic
Buer Boyetey, Emmanuel Dodzi Kpeglo, Albert Ayi
Ashiagbor EVALUATION OF PARAMETRIC ESTIMATION
METHODS FOR THE GAMMA DISTRIBUTION USING MAXIMUM
LIKELIHOOD AND BAYESIAN APPROACHES IN A CENSORED
LIFE-TESTING STRATEGY WITH MARKOV CHAIN MONTE
CARLO SIMULATIONS . Reliability: Theory &
Applications. 2025, March 1(82):515-527. DOI: https://doi.org/10.24412/1932-2321-2025-182-515-527
|
|
|
|
ENHANCING LINDLEY DISTRIBUTION
PARAMETER ESTIMATION WITH HYBRID BAYESIAN
AVERAGE MODEL FOR FUZZY DATA |
528-542 |
|
|
Abbarapu Ashok, Nadiminti Nagamani |
|
|
|
With the ultimate goal of increasing parameter
estimate accuracy, this study will examine and
assess a number of estimating techniques used
with the Lindley distribution in the context of
fuzzy data. Gibbs sampling, Bootstrapping
Sampling, MCMC, MH, and a unique hybrid
methodology that combines these approaches via
Bayesian model averaging were also studied. The
research looks at several sample sizes ranging
from 15 to 100 and repeats the estimate method
10,000 times for each size. Fuzzy data are
created using established fuzzy systems, and the
performance of each approach is measured using
average values (AV), mean squared errors (MSE),
coverage probabilities, and confidence interval
lengths. The findings show that the hybrid
technique consistently produces estimates closer
to the genuine parameter value of one across all
sample sizes, with smaller mean squared errors
than individual methods. Furthermore, the hybrid
method’s confidence intervals preserve coverage
probabilities that are consistent with the
targeted confidence level, demonstrating the
method’s trustworthiness in statistical
inference. Overall, the results show that the
hybrid technique improves estimate accuracy and
reliability, providing a strong foundation for
parameter estimation in the Lindley distribution
framework using fuzzy data. |
|
 |
|
Cite: Abbarapu Ashok, Nadiminti Nagamani
ENHANCING LINDLEY DISTRIBUTION PARAMETER
ESTIMATION WITH HYBRID BAYESIAN AVERAGE MODEL
FOR FUZZY DATA. Reliability: Theory &
Applications. 2025, March 1(82):528-542. DOI: https://doi.org/10.24412/1932-2321-2025-182-528-542
|
|
|
|
UNRELIABLE M/G/1 QUEUE WITH
GENERAL RETRIAL TIME, WORKING VACATION AND SETUP
TIME |
543-556 |
|
|
Hadjadj Houari , Arrar Nawel , Lahcene Yahiaoui |
|
|
|
In the current article, a retrial queuing system
with working vacations, interruptions, setup
time, and perfect repair is analyzed. The
scenario includes a server taking working
vacations during empty periods without a
complete halt of servicing customers; however,
the rates of service remain reduced. Further, a
setup time is included here, implying that if
the server remains idle when a new customer
enters, the state changes to inactive plus a
setup duration before restarting operation. In
this phase of setup, the setup failure happens
and is replaced immediately before the server
can proceed to normal operations. In addition to
this, automatic power-off to conserve energy is
there when no customer comes while the server is
in vacation mode. Customers who find that the
server cannot be accessed spend time waiting in
retrial orbit instead of entering a normal queue.
Here they’re encouraged to try again for service
after a random time. The steady state
probability generating functions for system size
and retrial group size are obtained by analyzing
the system dynamics through the supplementary
variable technique (SVT). Reliability and
optimization analyses will be included in what
will be studied from the system. Reliability
concerns evaluating the chances of the server
being available at different failure and repair
sites while in the system, while optimization
looks at the best configuration of system
parameters that will work towards achieving
greater efficiency and reduced delays. Explicit
mathematical formulations can be obtained under
ergodicity conditions describing the system size
distribution and sojourn time and state
probabilities. For a practical realization of
the model, which numerically experiments would
be carried out in Python, the theoretical
results were validated. Such results therefore
hold information on how direct retrials, setup
times, service rates, and repair mechanisms
affect overall system behavior. They also
provide strong evidence for trade-offs between
energy conservation on the one hand and
reliability together with continuous service on
the other. The proposed model together with
practical implementation thus produces very
significant inferences relevant to real service
models in which the optimization of resources
and efficiency of operation are critical. |
|
 |
|
Cite: Hadjadj Houari , Arrar Nawel ,
Lahcene Yahiaoui UNRELIABLE M/G/1 QUEUE WITH
GENERAL RETRIAL TIME, WORKING VACATION AND SETUP
TIME. Reliability: Theory & Applications. 2025,
March 1(82):543-556. DOI: https://doi.org/10.24412/1932-2321-2025-182-543-556
|
|
|
|
ESTIMATING THE POPULATION MEAN
USING STRATIFIED DOUBLE UNIFIED RANKED SET
SAMPLING FOR ASYMMETRIC DISTRIBUTIONS |
557-572 |
|
|
Mohammed Ahmed Alomair, Chainarong Peanpailoon,
Roohul Andrabi, Tundo, Khalid Ul Islam Rather |
|
|
|
In this study, we propose a novel sampling
technique known as Stratified Unified Ranked Set
Sampling (SDURSS) and evaluate its efficiency
for estimating population means. SDURSS is
designed to enhance the estimation accuracy by
integrating concepts from ranked set sampling
with stratified sampling. Our results
demonstrate that the SDURSS estimator generally
exhibits superior efficiency compared to SRS,
particularly in complex distribution scenarios.
While SDURSS often performs more efficiently
than SSRS and SRSS, its performance relative to
these methods varies depending on the specific
distribution and sample size. In several cases,
SDURSS outperforms SSRS and SRSS, highlighting
its potential benefits in practical applications.
The findings suggest that SDURSS is a promising
alternative to traditional sampling methods,
offering improved efficiency and potentially
more accurate estimates of population means.
This research underscores the value of exploring
advanced sampling techniques to enhance
statistical estimation, particularly in
scenarios involving asymmetric distributions
where traditional methods may be less effective. |
|
 |
|
Cite: Mohammed Ahmed Alomair, Chainarong
Peanpailoon, Roohul Andrabi, Tundo, Khalid Ul
Islam Rather ESTIMATING THE POPULATION MEAN
USING STRATIFIED DOUBLE UNIFIED RANKED SET
SAMPLING FOR ASYMMETRIC DISTRIBUTIONS .
Reliability: Theory & Applications. 2025, March
1(82):557-572. DOI: https://doi.org/10.24412/1932-2321-2025-182-557-572
|
|
|
|
A SIGNIFICANT STUDY ON ROBUST
MEASURE OF LOCATION PARAMETERS USING DATA DEPTH
APPROACHES |
573-579 |
|
|
Kalaivani S |
|
|
|
Data depth procedures are statistical methods
used to measure the centrality or depth of a
point within a multivariate dataset. These
procedures provide a way to quantify how deep or
outlying a point is relative to the overall
distribution of the data. This study explores
various data depth procedures to find reliable
location estimations in cases like with and
without outliers. In this paper, various depth
procedures, such as Mahalanobis depth, Halfspace
depth, Euclidean depth, Simplicial depth, and
Projection depth, are studied and compared. The
efficiency of these depth functions is evaluated
using real datasets and simulation studies with
R software. |
|
 |
|
Cite: Kalaivani S A SIGNIFICANT STUDY ON
ROBUST MEASURE OF LOCATION PARAMETERS USING DATA
DEPTH APPROACHES. Reliability: Theory &
Applications. 2025, March 1(82):573-579. DOI: https://doi.org/10.24412/1932-2321-2025-182-573-579
|
|
|
|
OPTIMIZING A LINEAR FRACTIONAL
FUNCTION OVER AN INTEGER EFFICIENT SET |
580-590 |
|
|
Leila YOUNSI-ABBACI |
|
|
|
Over recent decades, significant advancements
have been made in optimization over the
efficient set. This paper introduces a novel
exact algorithm designed to optimize a linear
fractional objective function over the integer
efficient set of a multi-objective linear
programming problem (MOILP). Without enumerating
all efficient solutions, our method employs a
selection strategy to iteratively improve the
primary objective while progressively refining
the feasible region and excluding dominated
points. By exploring edge connections within the
truncated feasible space, the proposed algorithm
ensures convergence to the global optimal value
in a finite number of iterations. A numerical
example demonstrates the algorithm’s
effectiveness and practical application. This
approach addresses critical challenges in
multiobjective integer programming, particularly
the nonconvexity of the efficient set and the
absence of explicit feasible set descriptions. |
|
 |
|
Cite: Leila YOUNSI-ABBACI OPTIMIZING A
LINEAR FRACTIONAL FUNCTION OVER AN INTEGER
EFFICIENT SET. Reliability: Theory &
Applications. 2025, March 1(82):580-590. DOI: https://doi.org/10.24412/1932-2321-2025-182-580-590
|
|
|
|
A MODIFIED INCIDENT EDGE PATH
ALGORITHM FOR EFFICIENT SHORTEST PATH SOLUTIONS
IN PIPELINE NETWORKS AND URBAN NAVIGATION
SYSTEMS |
591-600 |
|
|
Kanchana M, Kavitha K |
|
|
|
The article describes how to utilize the
Modified Incident Edge Path Algorithm (MIEPA) to
identify the cheapest transit option and the
best route. The MIEPA algorithm, which is based
on graph theory, is simple to use and can
potentially be employed to major smart logistics
challenges such as pipeline networks and Google
Maps. It evaluates the most optimal approach to
minimize transportation expenses using MATLAB.
The algorithm ensures that each node gets
visited and determines the shortest path from
the origin to all other nodes. The running time
complexity and theorem of the new method are
presented, and the algorithm is compared to the
existing algorithm. The proposed MIEPA addresses
negative weights and prevents negative cycles.
It has used two real-world problems to evaluate
the suggested algorithm. |
|
 |
|
Cite: Kanchana M, Kavitha K A MODIFIED
INCIDENT EDGE PATH ALGORITHM FOR EFFICIENT
SHORTEST PATH SOLUTIONS IN PIPELINE NETWORKS AND
URBAN NAVIGATION SYSTEMS. Reliability: Theory &
Applications. 2025, March 1(82):591-600. DOI: https://doi.org/10.24412/1932-2321-2025-182-591-600
|
|
|
|
ON SOME PROPERTIES AND
APPLICATIONS OF THE MODI-FRECHET DISTRIBUTION |
601-619 |
|
|
Akhila P., Girish Babu M. |
|
|
|
In this paper we introduce a novel expansion of
Frechet distribution from Modi family of
probability distributions. The important
statistical properties like moments, stochastic
ordering, and entropy are studied in this paper.
Two distinct characterizations of the proposed
distribution are derived through the hazard rate
function and truncated moments. The statistical
inference about the parameters of the new
distribution is studied using the method of
maximum likelihood estimation. To study the
flexibility and practical utility of the
distribution, two real-life data sets from the
reliability sector and from the biomedical field
were analyzed. An extensive simulation study is
also conducted to validate the accuracy and
consistency of the estimation techniques. |
|
 |
|
Cite: Akhila P., Girish Babu M. ON SOME
PROPERTIES AND APPLICATIONS OF THE MODI-FRECHET
DISTRIBUTION. Reliability: Theory & Applications.
2025, March 1(82):601-619. DOI: https://doi.org/10.24412/1932-2321-2025-182-601-619
|
|
|
|
BAYESIAN ESTIMATION OF INVERSE
AILAMUJIA DISTRIBUTION USING DIFFERENT LOSS
FUNCTIONS |
620-631 |
|
|
Aijaz Ahmad, Manzoor A. Khanday, Sonali Kedar
Powar, Aafaq A. Rather, C. Subramanian |
|
|
|
This paper focuses on the Bayesian estimation of
the parameter of the inverse Ailamujia
distribution, employing advanced prior
structures and diverse loss functions.
Specifically, the extended Jeffreys’ prior and
gamma prior are utilized to derive the Bayesian
estimators. Estimation is performed under
various loss functions, including squared error,
entropy, precautionary, and Linex loss functions,
ensuring a comprehensive analysis. To
demonstrate the practical applicability and
comparative performance of these estimators, an
empirical investigation is conducted using a
real dataset. The findings highlight the
adaptability and effectiveness of the proposed
Bayesian approach across different estimation
scenarios. |
|
 |
|
Cite: Aijaz Ahmad, Manzoor A. Khanday,
Sonali Kedar Powar, Aafaq A. Rather, C.
Subramanian BAYESIAN ESTIMATION OF INVERSE
AILAMUJIA DISTRIBUTION USING DIFFERENT LOSS
FUNCTIONS . Reliability: Theory & Applications.
2025, March 1(82):620-631. DOI: https://doi.org/10.24412/1932-2321-2025-182-620-631
|
|
|
|
ENHANCING EMOTION RECOGNITION
WITH MULTIMODEL APPROACH USING DEEP NEURAL
NETWORKS |
632-644 |
|
|
Dr. Komal Anadkat, Ayush Solanki, Dhruva Patel,
Vraj Thakkar |
|
|
|
Recognizing and extracting different emotions,
and then validating those emotions have become
important for enhancing human-computer
interaction. Emotions play a crucial role in
social interactions, facilitating rational
decision-making and perception. Previously
researched emotion recognition models have
typically focused on a single input type like
images, text, or audio, where each model can
identify the emotion of a person through a
single source like facial expressions, voice,
social media posts, etc. However, these
uni-model approaches are limited because they
rely on just one type of data, which often
misses the full range of emotional cues. To
overcome these limitations, multi-model emotion
recognition techniques are proposed which are
useful for detecting emotions through a person’s
facial expressions, speech, social media status,
and then EEG data. Model fusion techniques have
been applied to detect the most accurate emotion
for a particular person through fusion of all
the models. A recognition rate-based weighting
approach is proposed for model fusion, wherein
models are assigned weights proportional to
their individual recognition rates. This
approach enhances overall performance by
combining the outputs of various models with
higher emphasis on those with better accuracy.
The decision fusion-based multi- model emotion
recognition model is proposed which achieved a
maximum of 87%. accuracy using a bi-model
approach and 92% accuracy with a tri-model
approach. The weighted decision fusion approach
assigns more weight to the model which is more
accurate and achieved 93% accuracy. The proposed
recognition rate-based weighting approach for
fusion has provided significant results,
achieving approximately 93% accuracy with 0.900
and 0.904 Cohen kappa and Mathew score
respectively using facial expression, speech,
and social media text modalities on combined
dataset. The proposed model achieved 63%
accuracy on a real-world collected dataset
without considering EEG data and improved to 73%
if EEG is also considered. |
|
 |
|
Cite: Dr. Komal Anadkat, Ayush Solanki,
Dhruva Patel, Vraj Thakkar ENHANCING EMOTION
RECOGNITION WITH MULTIMODEL APPROACH USING DEEP
NEURAL NETWORKS . Reliability: Theory &
Applications. 2025, March 1(82):632-644. DOI: https://doi.org/10.24412/1932-2321-2025-182-632-644
|
|
|
|
OVERVOLTAGE AT THE TRANSFORMER
WHEN DISCONNECTING CLOSE ASYMMETRICAL SHORT
CIRCUITS |
645-657 |
|
|
Nahid Mufidzade, Gulgaz Ismayilova |
|
|
|
This article examines overvoltages at the inputs
of high-voltage (HV) and low-voltage (LV)
transformers rated at 110/6 kV and 110/10 kV,
focusing on scenarios involving grounded and
isolated neutrals during short circuits near the
transformers. The study finds that with an
isolated neutral, overvoltages resulting from a
phase-to-ground short circuit reach the highest
levels, as anticipated. However, the
disconnection of all types of asymmetrical short
circuits—whether with an isolated or grounded
neutral—yields even greater, potentially
excessive overvoltages. This occurs because the
windings of undamaged transformer phases remain
partially energized during disconnection,
leading to significant currents being
interrupted. The magnetic energy from these
currents converts to electrical energy,
resulting in substantial voltage increases,
characterized as pulsed overvoltages lasting
several microseconds. Implementing switches with
shunt resistance can reduce these overvoltages
considerably, though the remaining levels may
still exceed acceptable thresholds. To mitigate
the risk of such excessive overvoltages,
installing surge arresters at the inputs of
high-voltage transformers is recommended,
ensuring that transformer input overvoltages
remain within permissible limits. |
|
 |
|
Cite: Nahid Mufidzade, Gulgaz Ismayilova
OVERVOLTAGE AT THE TRANSFORMER WHEN
DISCONNECTING CLOSE ASYMMETRICAL SHORT CIRCUITS
. Reliability: Theory & Applications. 2025,
March 1(82):645-657. DOI: https://doi.org/10.24412/1932-2321-2025-182-645-657
|
|
|
|
OPTIMIZING BAYESIAN REPETITIVE
GROUP SAMPLING PLAN FOR QUALITY CONTROL TO
ENHANCE DECISION MAKING EFFICIENCY IN MODERN
MANUFACTURING |
658-672 |
|
|
P. Sivakumar1, V. Kaviyarasu, V. Devika |
|
|
|
This article introduces an approach to optimize
the design of Repetitive Group Sampling (RGS)
plan in the context of quality control for
modern manufacturing processes. The primary
objective of this study is to enhance
decision-making efficiency by applying Bayesian
principles to develop optimal sampling plans. In
modern manufacturing environment, the industries
are using the advanced technologies and
machineries to maintain the quality of their
products. The existence of defects would
consequently be highly rare in such production.
In such situation, Zero Inflated Poisson (ZIP)
distribution is a more appropriate probability
distribution rather than the usual Poisson
distribution. Further, manufacturing industries
often use a variety of manpower and materials to
produce their products in various production
streams. This may lead to have more quality
variation in between lots and hence, the lot
quality will vary over lots. The lots that arise
from such a production process will be unstable,
and quality variations among the units are often
heterogeneous in nature. In such situation, the
Bayesian sampling plans under Zero Inflated
Poisson distribution would be more effective and
alternative for traditional sampling plans. This
paper studies the designing and selection of
Bayesian Repetitive Group Sampling (BRGS) Plan
under the conditions of Gamma-Zero Inflated
Poisson distribution (G-ZIP). To investigate the
effectiveness of this plan, a comparison between
the proposed BRGS plan and various existing
sample plans is made. Further, we provided the
procedure and tables with the suitable numerical
illustration to compute the optimal sampling
plan. |
|
 |
|
Cite: P. Sivakumar1, V. Kaviyarasu, V.
Devika OPTIMIZING BAYESIAN REPETITIVE GROUP
SAMPLING PLAN FOR QUALITY CONTROL TO ENHANCE
DECISION MAKING EFFICIENCY IN MODERN
MANUFACTURING . Reliability: Theory &
Applications. 2025, March 1(82):658-672. DOI: https://doi.org/10.24412/1932-2321-2025-182-658-672
|
|
|
|
PERFORMANCE ANALYZATION OF
ERLANG SERVICE MODEL UNDER TRIANGULAR FUZZY
NUMBER BY USING THE L-R FUZZY APPROACH |
673-682 |
|
|
Dr. V. P. Anuja |
|
|
|
A traditional mathematical technique for
analyzing line-waiting delays and overcrowding
is queuing theory. It addresses the number of
patrons in line as well as numerous other
queue-related issues. Developing an Erlang
service model in a fuzzy environment is our
study’s goal. This study aims to investigate the
anticipated number of patients in the line as
well as the queuing system’s waiting time. To
achieve this, we applied the L-R strategy under
triangular fuzzy numbers and the alpha-cuts
method. To measure various linguistic aspects in
queuing systems, the fuzzy approach has been
used. The findings showed that waiting times are
determined using recommended techniques and that
the fuzzy Erlang model is stable. Finally, we
provide numerical examples to show the
capabilities of the suggested method. |
|
 |
|
Cite: Dr. V. P. Anuja PERFORMANCE
ANALYZATION OF ERLANG SERVICE MODEL UNDER
TRIANGULAR FUZZY NUMBER BY USING THE L-R FUZZY
APPROACH. Reliability: Theory & Applications.
2025, March 1(82):673-682. DOI: https://doi.org/10.24412/1932-2321-2025-182-673-682
|
|
|
|
DEVELOPMENT OF NEW METHODS FOR
PROTECTING SUBSTATION AND OVERHEAD LINES FROM
OVERVOLTAGES |
683-689 |
|
|
N.M. Piriyeva, N.S. Mammadov, S.V. Rzayeva |
|
|
|
This article explores various methods and
devices used for protecting overhead lines and
substations from surges, particularly those
induced by lightning strikes. Traditional surge
protection methods such as lightning rods,
arresters, and grounding systems are discussed,
highlighting their limitations and challenges,
especially in long-distribution networks. The
study examines the development and
implementation of novel surge protection devices,
including nonlinear surge arresters,
frequency-dependent devices (FDD), and
multi-chamber arresters. Special attention is
given to FDD, which utilizes ferromagnetic
materials to create frequency-dependent
resistance, effectively suppressing
high-frequency overvoltages. Experimental
results demonstrate the efficacy of FDD in
reducing the amplitude of lightning-induced
overvoltage pulses and enhancing the lightning
resistance of overhead lines and substations.
However, challenges such as insufficient
information on device effectiveness, limited
ohmic resistance at high frequencies, and size
constraints hinder widespread adoption. The
article concludes by emphasizing the need for
further research to optimize FDD designs,
increase active resistance, and assess
operational effectiveness to facilitate broader
deployment across different voltage classes. |
|
 |
|
Cite: N.M. Piriyeva, N.S. Mammadov, S.V.
Rzayeva DEVELOPMENT OF NEW METHODS FOR
PROTECTING SUBSTATION AND OVERHEAD LINES FROM
OVERVOLTAGES . Reliability: Theory &
Applications. 2025, March 1(82):683-689. DOI: https://doi.org/10.24412/1932-2321-2025-182-683-689
|
|
|
|
A MODIFIED WEIGHTED
DISTRIBUTION -
APPLICATION ON DIABETES MELLITUS AND PANCREATIC
CANCER DATA |
690-699 |
|
|
Praseeja C B, Prasanth C B, C Subramanian,
Unnikrishnan T |
|
|
|
This research article attempts to establish and
explore a case of two parameter Nwikpe
distribution and termed it as Area Biased C2N
distribution. As the characteristics of Hydrogen
per Oxide(H2O2) is quite different from that of
Water (H2O) even though both are the different
combinations of the same elements Oxygen &
Hydrogen, the characteristics of initial
distribution is also entirely different from
that of the area biased modified distribution.
The implemented new distribution has distinct
structural characteristics, and its parameters
are estimating using maximum likelihood
estimation. Utilizing biomedical data, the new
distribution’s application has been examining to
ascertain its superiority and utility. One
lifetime data set shows the mean reduction in
blood glucose (mg/dL) after three days of the
first usage of the Metformin medicine from a
random sample of 130 patients from a hospital at
Chennai, TamilNadu with type 2 diabetes mellitus
by testing the FBS-Fasting Blood Glucose. The
another set of lifetime data shows the mean
reduction in blood glucose (mg/dL) after each
dosage of the FIASP insulin-medicine in
alternate days of a pancreatic cancer patient,
noted for 63 days randomly. Both data set is
going to fit to the new distribution and analyze
them, to determine the supremacy and usefulness. |
|
 |
|
Cite: Praseeja C B, Prasanth C B, C
Subramanian, Unnikrishnan T A MODIFIED WEIGHTED
DISTRIBUTION -APPLICATION ON DIABETES MELLITUS
AND PANCREATIC CANCER DATA. Reliability: Theory
& Applications. 2025, March 1(82):690-699. DOI: https://doi.org/10.24412/1932-2321-2025-182-690-699
|
|
|
|
EXPLORING QUADRASOPHIC FUZZY
SET: APPLICATIONS IN ASSESSING STRESS LEVELS AND
SELF-ESTEEM CONNECTIONS |
700-714 |
|
|
G. Aruna, J. Jesintha Rosline, A. Anthoni Amali |
|
|
|
The ambiguous environment has been addressed
with a variety of fuzzy sets and their
extensions. The Quadrasophic Fuzzy Set is one of
the generalization of Fuzzy set to handle
imprecise information efficiently. It is defined
with two new parameters. In this artifact, we
defined the operations, theorems, and relations
of the Quadrasophic Fuzzy Set with pertinent
examples. We also established a comparison study
with other existing models. Additionally, the
integration of Quadrasophic Fuzzy data with the
TOPSIS approach to solve the Multi Criteria
Decision Making problem is proposed and
illustrated by examining the relationship
between employee stress levels and their
self-esteem, which can trigger
obsessive-compulsive disorder, using real-life
data. The results are analyzed with SPSS
software. |
|
 |
|
Cite: G. Aruna, J. Jesintha Rosline, A.
Anthoni Amali EXPLORING QUADRASOPHIC FUZZY SET:
APPLICATIONS IN ASSESSING STRESS LEVELS AND
SELF-ESTEEM CONNECTIONS. Reliability: Theory &
Applications. 2025, March 1(82):700-714. DOI: https://doi.org/10.24412/1932-2321-2025-182-700-714
|
|
|
|
BAYESIAN GLM: A
NON-INFORMATIVE APPROACH FOR PARAMETER
ESTIMATION IN EXPONENTIAL DISPERSION REGRESSION
MODELS |
715-727 |
|
|
Ibrahim Sadok, Mourad Zribi |
|
|
|
This paper proposes a novel Bayesian approach to
parameter estimation in exponential dispersion
regression models (EDRM). By employing a
non-informative prior distribution, we offer a
flexible and robust framework that avoids the
need for subjective prior specification. To
efficiently sample from the posterior
distribution, we develop an importance-sampling
algorithm tailored to the EDRM. Through a
real-world data analysis, we demonstrate the
efficacy of our proposed method in providing
accurate and reliable parameter estimates. This
research contributes to the advancement of
Bayesian statistical modeling techniques and
offers valuable insights for practitioners in
various fields. |
|
 |
|
Cite: Ibrahim Sadok, Mourad Zribi
BAYESIAN GLM: A NON-INFORMATIVE APPROACH FOR
PARAMETER ESTIMATION IN EXPONENTIAL DISPERSION
REGRESSION MODELS. Reliability: Theory &
Applications. 2025, March 1(82):715-727. DOI: https://doi.org/10.24412/1932-2321-2025-182-715-727
|
|
|
|
IMPLEMENTATION OF THE MAXIMUM
PERMISSIBLE OVERLOAD CAPACITY OF A DC MOTOR |
728-733 |
|
|
Rafig Sultanov, Elbrus Ahmedov, Nadir Aliyev |
|
|
|
DC motors, due to their wide applicability in
various industrial sectors, necessitate precise
control of their overload capacity to ensure
safe and efficient operation. This study
presents a comprehensive methodology for
assessing the maximum permissible overload
capacity of a DC motor. The core of this
methodology lies in the derivation and
application of the electromechanical
characteristic equation of an electric drive
with current cutoff. This equation serves as the
foundation for constructing the
electromechanical characteristics of the drive,
providing a detailed representation of the
motor's performance under varying operational
conditions. A novel circuit is proposed,
featuring an automatic adjustment mechanism for
the cut-off current setting based on the speed
of the electric drive. This adaptive circuit
design ensures that the motor operates within
its maximum permissible overload capacity,
thereby optimizing performance and preventing
potential damage due to excessive loads. By
leveraging this advanced control methodology,
the reliability and efficiency of DC motors in
industrial applications can be significantly
enhanced. This approach not only maximizes the
motor's operational capabilities but also
contributes to the overall safety and longevity
of the electric drive systems. |
|
 |
|
Cite: Rafig Sultanov, Elbrus Ahmedov,
Nadir Aliyev IMPLEMENTATION OF THE MAXIMUM
PERMISSIBLE OVERLOAD CAPACITY OF A DC MOTOR .
Reliability: Theory & Applications. 2025, March
1(82):728-733. DOI: https://doi.org/10.24412/1932-2321-2025-182-728-733
|
|
|
|
THE ROLE OF MODERN GROUNDING
DEVICES IN ENSURING THE STABILITY OF POWER
SYSTEMS |
734-742 |
|
|
I.N. Rahimli, A.L. Bakhtiyarov, G.K. Abdullayeva |
|
|
|
The article focuses on investigating the impact
of grounding device parameters on the stability
of power systems under external disturbances,
such as short circuits and lightning strikes.
The study examines transient processes in power
systems, including the analysis of rotor angle
variations in generators and voltage recovery.
Numerical modeling based on the equations of
synchronous generators and electromagnetic
transient processes is employed. A comparative
analysis of various grounding device
configurations is conducted, taking into account
their resistance and the system's recovery time.
The research results identify the optimal
parameters of grounding devices that minimize
the recovery time of power systems and enhance
their overall stability. The findings can be
utilized in the design and operation of power
systems with improved reliability. |
|
 |
|
Cite: I.N. Rahimli, A.L. Bakhtiyarov,
G.K. Abdullayeva THE ROLE OF MODERN GROUNDING
DEVICES IN ENSURING THE STABILITY OF POWER
SYSTEMS . Reliability: Theory & Applications.
2025, March 1(82):734-742. DOI: https://doi.org/10.24412/1932-2321-2025-182-734-742
|
|
|
|
RELIABILITY, AVAILABILITY AND
MAINTAINABILITY OF A BOILER IN THERMAL POWER
PLANT– A CASE STUDY |
743-753 |
|
|
K. Sunitha, T. Sumathi Uma Maheshwari, M.
Tirumala Devi, A. Satyanarayana4 |
|
|
|
Many countries face problems in electricity
generation. Boilers play an important role in a
power plant. Sudden failures of a power plant
boiler components cause loss of production and
high maintenance cost. Due to unplanned and
irregular maintenance, which can ultimately
increase the production cost of electricity.
This is a common challenge faced by power plant
operators worldwide. The present study aims to
examine and analyze the failure times of a
boiler at a thermal power plant and identify its
critical failure expectancy and system
reliability. The data was collected over a long
period and was analyzed using statistical
methods. In this study, the hypothesis has been
proposed to choose the best analysis.
Furthermore, reliability, availability, and
maintainability analysis were carried out under
discrete analysis. The analysis included
identifying the probability distribution of the
failure times, identifying critical failure
expectancy, and determining system reliability. |
|
 |
|
Cite: K. Sunitha, T. Sumathi Uma
Maheshwari, M. Tirumala Devi, A. Satyanarayana4
RELIABILITY, AVAILABILITY AND MAINTAINABILITY OF
A BOILER IN THERMAL POWER PLANT– A CASE STUDY.
Reliability: Theory & Applications. 2025, March
1(82):743-753. DOI: https://doi.org/10.24412/1932-2321-2025-182-743-753
|
|
|
|
PROBABILISTIC INVENTORY MODEL
FOR DETERIORATING ITEMS WITH UNCERTAIN DEMAND
UNDER PENTAGONAL FUZZY ENVIRONMENT |
754-772 |
|
|
Ashish Negi, Ompal Singh |
|
|
|
Using a pentagonal fuzzy framework, this
research presents a probabilistic inventory
model for deteriorating items under an uncertain
demand. Degeneration of items puts a company’s
financial ability to meet its objectives at risk.
Few models have synchronized optimization over
this whole scenario with all components,
according to a survey of the literature. It
deals with the difficulties of inventory control
in situations where demand is represented by
fuzzy sets but is not precisely known. The model
offers a clearer and more useful understanding
of demand uncertainty by defuzzifying pentagonal
fuzzy numbers using the Graded Mean Integration
Representation (GMIR) approach. The goal of the
study is to optimize inventory levels in order
to minimize total costs, which include holding,
degradation, shortage, and purchase. These
components are included into a mathematical
model, and numerical scenarios are shown to
compare the both potential strategies. The
sensitivity of the solution and decision
variables with respect to different inventory
characteristics is examined in both crisp and
fuzzy settings. Fuzzy logic is integrated into
the model to provide a strong framework for
making decisions when dealing with ambiguous
demand and the complications that come with
deteriorating inventory. The paper includes
numerical examples and sensitivity analyses to
demonstrate the model™s effectiveness and
practical relevance. These findings provide
valuable guidance for inventory managers aiming
to improve decision-making and operational
efficiency in contexts with fuzzy demand and
deteriorating products. At the optimal position,
the total cost is relatively inelastic to an
increase in base deterioration rate and more
elastic to a decrease in it. Although the crisp
example is marginally less efficient per unit
cost, total costs are lower than in the fuzzy
case, which is to be expected given the fuzzy
case’s potential for superior results. |
|
 |
|
Cite: Ashish Negi, Ompal Singh
PROBABILISTIC INVENTORY MODEL FOR DETERIORATING
ITEMS WITH UNCERTAIN DEMAND UNDER PENTAGONAL
FUZZY ENVIRONMENT. Reliability: Theory &
Applications. 2025, March 1(82):754-772. DOI: https://doi.org/10.24412/1932-2321-2025-182-754-772
|
|
|
|
RELIABILITY ANALYSIS OF A
POWER DISTRIBUTION SYSTEM WITH TWO TRANSFORMERS
AND SIX FEEDERS |
773-786 |
|
|
Syed Mohd Rizwan, Satish Tanavade, Kajal
Sachdeva, Syed Zegham Taj |
|
|
|
The article explores the reliability and
sensitivity of a power distribution substation.
It includes an analysis based on real
maintenance data collected from a 33/11kV
electrical power distribution substation, which
features a set of two 6 MVA power transformers
supplying power through a total of six outgoing
feeders (three feeders per transformer). The
study documents faults observed in both
transformers and all six outgoing feeders. The
reliability of the substation is evaluated using
various indices such as availability, repair
durations, and expected repair frequencies for
different failure types. The analysis employs
Markov processes and regenerative point
techniques. In addition to reliability, the
study includes a profit analysis of the
substation. It presents graphical
representations of key parameters. Furthermore,
a sensitivity analysis is conducted to assess
how variations in parameters impact the
availability and profitability of the substation
components. Substation economics is also
established to assess the operational viability. |
|
 |
|
Cite: Syed Mohd Rizwan, Satish Tanavade,
Kajal Sachdeva, Syed Zegham Taj RELIABILITY
ANALYSIS OF A POWER DISTRIBUTION SYSTEM WITH TWO
TRANSFORMERS AND SIX FEEDERS . Reliability:
Theory & Applications. 2025, March
1(82):773-786. DOI: https://doi.org/10.24412/1932-2321-2025-182-773-786
|
|
|
|
A NEW FAMILY OF LINDLEY
DISTRIBUTIONS FEATURING BIMODAL CASES |
787-799 |
|
|
Festus C. Opone, Jacob C. Ehiwario, Sunday A.
Osagie, John N. Igabari, Nosakhare Ekhosuehi |
|
|
|
Several lifetime distributions have been
developed in literature to handle different
real-world scenario. Most of these distributions
were developed to model a unimodal (symmetric or
asymmetric) data. Only a hand-full of these
distributions exhibits a bimodal property. This
paper explores a new family of Lindley
distributions featuring a bimodal property. We
introduce five different sub-families of the
T-Power Lindley{Y} family based on the quantile
function of the uniform, exponential, Frechet,
log-logistic and logistic distributions. Useful
mathematical properties of the proposed T-Power
Lindley{Y} family of distributions are derived
and sub-models were the random variable T
follows the one-parameter Topp- Leone,
exponential, exponentiated exponential, Weibull
and Gumbel distributions are introduced. From
the graphical representation of the density
function of these sub-models, we observe that
the shape of the density function accommodates a
decreasing (reversed-J), left-skewed,
right-skewed, symmetric, as well as a bimodal
shape. In order to illustrate the usefulness and
performance of the proposed T-Power Lindley{Y}
family of distributions, the Gumbel Power
Lindley (GPL) distribution belonging to the
proposed family of distribution was employed to
fit a bimodal data set alongside with the
beta-Normal distribution. Result obtained from
the analysis revealed that the Gumbel Power
Lindley (GPL) distribution compares favourably
better than the beta-Normal distribution. The
density fits of the distributions for the data
set was also investigated to support the claim. |
|
 |
|
Cite: Festus C. Opone, Jacob C. Ehiwario,
Sunday A. Osagie, John N. Igabari, Nosakhare
Ekhosuehi A NEW FAMILY OF LINDLEY DISTRIBUTIONS
FEATURING BIMODAL CASES. Reliability: Theory &
Applications. 2025, March 1(82):787-799. DOI: https://doi.org/10.24412/1932-2321-2025-182-787-799
|
|
|
|
OPTIMIZING TWO-WAREHOUSE
INVENTORY MODEL FOR DETERIORATING ITEMS WITH
GENERALIZED EXPONENTIAL DEMAND, PARTIAL
BACKLOGGING, AND INFLATION USING BACTERIAL
FORAGING OPTIMIZATION |
800-813 |
|
|
Garima Sethi, Ajay Singh Yadav, Chaman Singh |
|
|
|
This paper presents a novel two-warehouse
inventory model for degrading products, where
the demand rate is governed over time by a
generalized exponential function. Two real-world
supply chain challenges that are taken into
account in the model are the economic effects of
inflation and partial backlog. By reducing the
whole cost, which includes holding, shortage,
and degradation charges, the Bacterial Foraging
Optimization (BFO) method maximizes inventory
management. The effectiveness of the model is
validated through a comprehensive numerical
example, and graphical representations
demonstrate the impact of key factors on system
performance. The results demonstrate how BFO may
be used to complex inventory problems, giving
supply chain managers crucial data as they try
to balance cost-effectiveness and demand
fluctuations in an inflationary environment.
This approach highlights the need of advanced
optimization techniques in improving
decision-making processes for degrading products
in a two-warehouse scenario. |
|
 |
|
Cite: Garima Sethi, Ajay Singh Yadav,
Chaman Singh OPTIMIZING TWO-WAREHOUSE
INVENTORY MODEL FOR DETERIORATING ITEMS WITH
GENERALIZED EXPONENTIAL DEMAND, PARTIAL
BACKLOGGING, AND INFLATION USING BACTERIAL
FORAGING OPTIMIZATION. Reliability: Theory &
Applications. 2025, March 1(82):800-813. DOI: https://doi.org/10.24412/1932-2321-2025-182-800-813
|
|
|
|
SURVIVAL ANALYSIS OF A
STOCHASTIC MODEL ON CARDIOVASCULAR SYSTEM
CONSIDERING POSSIBILITES OF DAMAGE, FAILURE AND
RECOVERY OF HEART |
814-826 |
|
|
Shikha Bhardwaj, Rajeev Kumar |
|
|
|
The present paper deals with survival analysis
of a stochastic model on cardiovascular system
considering possibilities of damage, failure and
recovery of heart. The analysis is based upon a
stochastic model for the system considering
different kinds of damage and failure of heart
at different situations. The treatments and
recovery of heart are taken in to account. On
complete failure of heart, transplantation of
the heart is also considered. The model has been
analyzed by determining important measures of
effectiveness using Markov process and
regenerative point technique. Sensitivity
analysis has also been done to select important
parameters for enhancing the survivability of
the system. |
|
 |
|
Cite: Shikha Bhardwaj, Rajeev Kumar
SURVIVAL ANALYSIS OF A STOCHASTIC MODEL ON
CARDIOVASCULAR SYSTEM CONSIDERING POSSIBILITES
OF DAMAGE, FAILURE AND RECOVERY OF HEART .
Reliability: Theory & Applications. 2025, March
1(82):814-826. DOI: https://doi.org/10.24412/1932-2321-2025-182-814-826
|
|
|
|
SAMPLING INSPECTION SCHEMES
WITH SWITCHING RULES FOR LIFE TESTS BASED ON
EXPONENTIAL DISTRIBUTION |
827-834 |
|
|
A. Pavithra, R. Vijayaraghavan |
|
|
|
A life test is a random experiment which is
performed on manufactured items such as electric
and electronic components in order to estimate
their lifetime by selecting the items randomly
from the production process. The lifetime /
lifespan of the product is a random variable
that follows a specific continuous-type
probability distribution, called the lifetime
distribution. Reliability sampling, which is one
among the classifications of product control
techniques, deals with inspection procedures for
sentencing one or more lots or batches of items
submitted for inspection. An acceptance sampling
scheme is a combination of sampling inspection
plans with switching rules for changing from one
plan to another. A switching rule is an
instruction within a sampling scheme for
changing from one sampling plan to another of
greater or lesser severity of sampling based on
the demonstrated quality history. In this paper,
the concept of sampling schemes for life tests
with a switching rule involving two samples
under the assumption that the lifetime random
variable follows an exponential distribution is
introduced. A procedure is developed for
designing the optimum sampling schemes with
minimum sample sizes when two points on the
desired operating characteristic curve are
prescribed providing protection to the producer
and the consumer. |
|
 |
|
Cite: A. Pavithra, R. Vijayaraghavan
SAMPLING INSPECTION SCHEMES WITH SWITCHING RULES
FOR LIFE TESTS BASED ON EXPONENTIAL DISTRIBUTION.
Reliability: Theory & Applications. 2025, March
1(82):827-834. DOI: https://doi.org/10.24412/1932-2321-2025-182-827-834
|
|
|
|
USE OF MEDIAN BASED ESTIMATOR
TO MITIGATE OUTLIER’S EFFECT THROUGH
S2 CHART |
835-847 |
|
|
Sonam Jaiswal |
|
|
|
In this paper, we consider an upper-sided Phase
II variance chart with probability limits in
case of unknown parameter because the quality
practitioner interested in monitoring increased
variance of the process parameter. It is well
established that when the Phase I data are
contaminated with spurious observations,
performance of the chart is suspected to deviate
from what is normally expected. Therefore, we
propose an improved performance of one-sided
variance chart under the exceedance probability
criterion for a fixed in-control average run
length using the absolute deviation from median
estimator. Under the exceedance probability
criteria, the chart is designed so that the user
can get more confidence in their in-control
average run length values. The proposed chart is
compared with the existing chart in case of
contaminated and non-contaminated observations.
Result shows that performance of variance chart
shows robust performance when using absolute
deviation from median estimator. Finally, an
example has been provided in the favour of our
proposed study. |
|
 |
|
Cite: Sonam Jaiswal USE OF MEDIAN BASED
ESTIMATOR TO MITIGATE OUTLIER’S EFFECT THROUGH
S2 CHART . Reliability:
Theory & Applications. 2025, March
1(82):835-847. DOI: https://doi.org/10.24412/1932-2321-2025-182-835-847
|
|
|
|
ADVANCED STATISTICAL APPROACH
TO FAILURE DATA WITH GAMMA AND WEIBULL
DISTRIBUTIONS |
848-854 |
|
|
Vijayan S, Kavitha S |
|
|
|
This paper aims to systematically investigate
the utility of the Gamma and Weibull
distributions, focusing on their application to
biomedical datasets and clarifying their
mathematical and statistical properties. By
analyzing lifetime data across various
disciplines, the research emphasizes the
effectiveness and flexibility of these
distributions in capturing the complexities of
biomedical data. It underscores the importance
of parameters such as standard error,
log-likelihood, Akaike Information Criterion (AIC),
and Bayesian Information Criterion (BIC) in
value estimation. The findings suggest that both
distributions provide valuable insights into the
underlying data, with practical implications for
reliability engineering and failure analysis.
Moreover, the study demonstrates that the
Weibull distribution offers a better fit to the
given data than the Gamma distribution due to
its adaptability, which yields superior results.
A key contribution of this study is the proposal
of a model based on estimating the Conditional
Weibull distribution for feature parameters,
which accurately predicts a finite mixture of
two-parameter Weibull distributions initially
verified on datasets. |
|
 |
|
Cite: Vijayan S, Kavitha S ADVANCED
STATISTICAL APPROACH TO FAILURE DATA WITH GAMMA
AND WEIBULL DISTRIBUTIONS . Reliability: Theory
& Applications. 2025, March 1(82):848-854. DOI: https://doi.org/10.24412/1932-2321-2025-182-848-854
|
|
|
|
BAYESIAN PARAMETER ESTIMATION
FOR TRANSMUTED WEIBULL DISTRIBUTION WITH
CENSORING RATES AND VARIOUS LOSS FUNCTIONS |
855-864 |
|
|
Jeslin J, Radhika A, Haripriya M |
|
|
|
Statistical distributions are essential tools
for describing and predicting real-world
phenomena, though recent advancements in data
collection have made it challenging to fit
existing probability models to many practical
datasets. While non-parametric models are
sometimes recommended, parametric models retain
substantial popularity due to their
interpretability and flexibility. The quadratic
rank transmutation map (QRTM) technique has been
used to create new families of non-Gaussian
distributions, known as transmuted distributions,
which allow for modifications in moments,
skewness, and kurtosis, thus increasing
flexibility. The transmuted Weibull distribution
(TWD) has gained attention for applications in
reliability, survival analysis, and lifetime
data analysis. This article focuses on a
Bayesian analysis of the transmuted Weibull
distribution, a generalization of the
traditional Weibull model that addresses its
limitations, particularly for datasets
exhibiting non-monotonic failure rates. Bayesian
parameter estimation is performed using a Markov
Chain Monte Carlo (MCMC) algorithm, with both
non-informative and informative priors. We
calculate Bayes estimators (BEs) and posterior
risks (PRs) under different loss functions,
including the Absolute Error Loss Function (AELF),
precautionary loss function (PLF), and quadratic
loss function (QLF). Simulation studies evaluate
the Bayes estimators' performance, investigating
the effects of various priors, sample sizes, and
censoring rates on estimation accuracy and
credible interval width. Real-world data
applications highlight the practical utility of
the Bayesian approach for the TWD, showing
consistent results with increasing sample sizes
and underscoring the robustness of the MCMC
algorithm for parameter estimation. The article
is structured as follows: the TWD’s parameters,
including scale, shape, and transmutation, are
estimated under different loss functions and
priors. Bayesian credible intervals (BCIs) are
also computed. Both uncensored and censored data
environments are considered, with varying sample
sizes and censoring rates. Posterior risks for
each estimator are analyzed to assess
performance, and two real datasets are used to
illustrate the flexibility and applicability of
the proposed distribution. This study lays a
foundation for future research, such as
exploring mixtures of transmuted Weibull
distributions or conducting Bayesian analyses
for record values. |
|
 |
|
Cite: Jeslin J, Radhika A, Haripriya M
BAYESIAN PARAMETER ESTIMATION FOR TRANSMUTED
WEIBULL DISTRIBUTION WITH CENSORING RATES AND
VARIOUS LOSS FUNCTIONS . Reliability: Theory &
Applications. 2025, March 1(82):855-864. DOI: https://doi.org/10.24412/1932-2321-2025-182-855-864
|
|
|
|
OPTIMIZATION OF EQUIPMENT
RELIABILITY BASED ON A NEURO-FUZZY APPROACH:
CASE OF A FLOUR MILL |
865-882 |
|
|
Ngnassi Djami Aslain Brisco |
|
|
|
The main objective of this paper is to present
an innovative approach combining fuzzy logic and
artificial neural networks to optimize equipment
reliability in the specific context of a flour
mill. Faced with the challenges of performance
and profitability in this industrial sector, the
neuro-fuzzy methodology has been developed to
meet the challenges related to the complexity
and uncertainty inherent in equipment
reliability management. The first part of the
paper provides an overview of the problem,
introducing the key concepts of reliability and
maintenance, while highlighting the particular
challenges of the milling industry. This paper
also outlines the advantages of the neuro-fuzzy
approach for optimizing equipment reliability.
The methodology for developing the neuro-fuzzy
model is detailed in the second part. It covers
the construction of the fuzzy inference system,
the design of the neural network structure, as
well as the training and optimization steps of
the model. The case study conducted in a flour
mill is presented in the third part. After a
description of the company and its equipment
system, the collection and analysis of
reliability data are presented, as well as the
implementation of the developed neuro-fuzzy
model. The results obtained demonstrate that
this methodology makes it possible to better
anticipate failures, optimize maintenance
interventions, and reduce associated costs.
Sensitivity analysis and comparison with other
optimization methods confirm the validity and
operational and economic benefits of the
proposed approach. |
|
 |
|
Cite: Ngnassi Djami Aslain Brisco
OPTIMIZATION OF EQUIPMENT RELIABILITY BASED ON A
NEURO-FUZZY APPROACH: CASE OF A FLOUR MILL .
Reliability: Theory & Applications. 2025, March
1(82):865-882. DOI: https://doi.org/10.24412/1932-2321-2025-182-865-882
|
|
|
|
ENHANCING INTRUSION DETECTION
SYSTEM RELIABILITY USING GWO-SOMNN (GREY WOLF
OPTIMIZATION WITH SELF-ORGANIZING MAP NEURAL
NETWORK) |
883-896 |
|
|
Archana Gondalia, Apurva Shah |
|
|
|
In today’s fast-changing technological
environment, the number of Internet-connected
devices has grown significantly, raising the
risk of cybersecurity threats for both
individuals and organizations. Network Intrusion
Detection Systems (NIDS) have become vital tools
for protecting networks from these increasing
threats. This paper presents a GWO-SOMNN
approach (Gray Wolf Optimization with
Self-Organizing Map Neural Network) that
combines Grey Wolf Optimization (GWO),
Self-Organizing Maps (SOM) and Neural Networks (NN)
for feature selection and classification on the
UNSW-NB15 dataset. The proposed method leverages
GWO to optimize feature selection, reducing the
dataset’s dimensionality and computational load,
while SOM is employed for clustering and
visualizing high-dimensional data. Neural
Networks are then used for effective
classification of network attacks. The GWO-SOMNN
approach is evaluated on the UNSW-NB15 dataset,
and its performance is measured in terms of
97.18% accuracy and 97.15% F1-score for binary
classification and 82.41% accuracy and 78.92%
F1-score for multiclass classification. The
results demonstrate significant improvements
over traditional methods, particularly in
enhancing the classification of both binary and
multi-class network attacks. These findings
highlight the potential of this integrated
approach in developing more efficient and
accurate network intrusion detection systems. |
|
 |
|
Cite: Archana Gondalia, Apurva Shah
ENHANCING INTRUSION DETECTION SYSTEM RELIABILITY
USING GWO-SOMNN (GREY WOLF OPTIMIZATION WITH
SELF-ORGANIZING MAP NEURAL NETWORK). Reliability:
Theory & Applications. 2025, March
1(82):883-896. DOI: https://doi.org/10.24412/1932-2321-2025-182-883-896
|
|
|
|
ANALYSIS OF AN ENCOURAGED
ARRIVAL MARKOVIAN QUEUE WITH SINGLE WORKING
VACATION, IMPATIENCE AND RENEGING OF CUSTOMERS |
897-902 |
|
|
V. Narmadha, P. Rajendran |
|
|
|
In this paper, we analyze a single server
markovian queueing model with encouraged
arrivals that undergoes a single working
vacation. Additionally, we consider the
impatience and reneging behavior of customers in
the queue during the working vacation period.
Customers arrive at the system following a
Poisson distribution. The server goes on
vacation when the system is empty and stays on
vacation for a random period that follows an
exponential distribution. During the working
vacation period, the server continues to provide
service at a slower rate. After the vacation,
the server returns to the regular service period
and continues providing service at the regular
busy period rate if there are one or more
customers in the system, or it remains idle
until a new customer arrives. During the working
vacation, customers in the queue become
impatient and renege from the system, with the
reneging time assumed to follow an exponential
distribution. The system is characterised as a
quasi-birth-death process, and the stationary
probabilities are derived using the probability
generating function method. Some numerical
analysis is also carried out to show the effect
of encouraged arrivals on performance measures. |
|
 |
|
Cite: V. Narmadha, P. Rajendran ANALYSIS
OF AN ENCOURAGED ARRIVAL MARKOVIAN QUEUE WITH
SINGLE WORKING VACATION, IMPATIENCE AND RENEGING
OF CUSTOMERS . Reliability: Theory &
Applications. 2025, March 1(82):897-902. DOI: https://doi.org/10.24412/1932-2321-2025-182-897-902
|
|
|
|
IMPACT OF DESIGN AND
CONSTRUCTION ERRORS ON THE STRUCTURAL
RELIABILITY OF STEEL INDUSTRIAL BUILDINGS |
903-917 |
|
|
Andrey Lipin, Seymur Bashirzade, Mukhlis Hajiyev,
Rafail Garibov |
|
|
|
Errors in design and construction critically
undermine the structural reliability of
industrial buildings, putting property, the
environment, and human safety at risk. In this
regard, the present research work is intended to
investigate how such mistakes influence the
performance of the main structural components
and the stability of steel industrial buildings.
Detailed finite element analysis was performed
using DIANA FEA for solid modeling and SAP2000
for beam modeling to assess global structural
performance. This includes, among others, the
insufficiency of local reinforcement in
compressed members and eccentricity in column
connections. It was performed to analyze the
local and global buckling behaviors, deviations
in symmetry, and inefficiency of the bracing
systems. Consequently, it reveals a significant
reduction in load-bearing capacity due to
reinforcement deficiencies in the compressed
elements and eccentricity, while a structural
loss in integrity becomes highly significant at
symmetry deviations, especially in horizontal
loads. This study provides critical insights
into mitigating design and construction errors
to enhance the reliability of industrial steel
buildings. |
|
 |
|
Cite: Andrey Lipin, Seymur Bashirzade,
Mukhlis Hajiyev, Rafail Garibov IMPACT OF
DESIGN AND CONSTRUCTION ERRORS ON THE STRUCTURAL
RELIABILITY OF STEEL INDUSTRIAL BUILDINGS .
Reliability: Theory & Applications. 2025, March
1(82):903-917. DOI: https://doi.org/10.24412/1932-2321-2025-182-903-917
|
|
|
|
COST AND RELIABILITY
OPTIMIZATION OF A COMPLEX SYSTEM USING
MULTI-OBJECTIVE GREY WOLF OPTIMIZATION TECHNIQUE |
918-927 |
|
|
Anuj Kumar, Ganga Negi, Mangey Ram, Sangeeta
Pant, Sushil Chandra Dimri |
|
|
|
Modern engineering systems increasingly focus on
multi-objective optimization. Nature-inspired
optimization techniques have shown superior
efficiency and effectiveness compared to many
traditional methods across various parameters.
This work demonstrates the reliability and cost
optimization of a complex bridge system using
the Multi-Objective Grey Wolf Optimization
algorithm (MOGWO). The bridge system in question
is a series-parallel system. A key performance
highlight is the use of an archive for search
agents to generate a Pareto optimal front (PoF)
with a minimal number of iterations. Among the
various solutions in the PoF, the solution set
that best meets the multi-objective criteria is
preferred. Additionally, statistical analyses
are conducted to further validate the
competitiveness of the results. |
|
 |
|
Cite: Anuj Kumar, Ganga Negi, Mangey Ram,
Sangeeta Pant, Sushil Chandra Dimri COST AND
RELIABILITY OPTIMIZATION OF A COMPLEX SYSTEM
USING MULTI-OBJECTIVE GREY WOLF OPTIMIZATION
TECHNIQUE . Reliability: Theory & Applications.
2025, March 1(82):918-927. DOI: https://doi.org/10.24412/1932-2321-2025-182-918-927
|
|
|
|
EXPLORING AN EXTENDED RAYLEIGH
DISTRIBUTION: MODELING AND APPLICATIONS IN REAL
LIFE SCENARIOS |
928-941 |
|
|
Aadil Ahmad Mir, S.P. Ahmad |
|
|
|
In this manuscript, we propose a new extension
of the Rayleigh distribution, named as Ratio
Transformation Rayleigh Distribution (RTRD),
which offers superior fits compared to the
Rayleigh distribution and several of its known
generalizations. We derive various properties of
the proposed distribution, including moments,
moment generating function, hazard rate,
conditional moments, Bonferroni and Lorenz
curves, mean residual life, mean waiting time,
Renyi entropy and order statistics. The unknown
parameters are estimated using the maximum
likelihood estimation procedure. An extensive
simulation study is conducted to illustrate the
behavior of the maximum likelihood estimators (MLEs)
based on Mean Square Errors. The flexibility of
the new distribution is demonstrated by applying
it to two real data sets. Comparative analysis
with the Rayleigh distribution, Weighted
Rayleigh distribution, Exponentiated Rayleigh
distribution and Transmuted Rayleigh
distribution reveals that RTRD outperforms these
competing distributions based on Akaike
Information Criterion (AIC), Bayesian
Information Criterion (BIC), Akaike Information
Criterion Corrected (AICC) and other goodness of
fit measures. |
|
 |
|
Cite: Aadil Ahmad Mir, S.P. Ahmad
EXPLORING AN EXTENDED RAYLEIGH DISTRIBUTION:
MODELING AND APPLICATIONS IN REAL LIFE SCENARIOS.
Reliability: Theory & Applications. 2025, March
1(82):928-941. DOI: https://doi.org/10.24412/1932-2321-2025-182-928-941
|
|
|
|
THE MARSHALL-OLKIN EXTENDED
SHANKER DISTRIBUTION AND ITS APPLICATIONS |
942-956 |
|
|
Sara Ziari, S.M.T.K. MirMostafaee |
|
|
|
In this paper, we introduce the Marshall–Olkin
extended Shanker distribution, as an extension
of the Shanker distribution, using the
Marshall-Olkin approach. Several important
properties of the new distribution, such as the
hazard rate function, moments, incomplete
moments, mean deviations, Lorenz and Bonferroni
curves, and Rényi entropy are explored. The
estimation of the parameters is discussed with
the help of the maximum likelihood method. The
performance of the estimators is evaluated using
a simulation study. Two real data applications
are developed in order to assess the flexibility
and power of the new distribution. The goodness
of fit criteria reveal that the new model may
provide a better fit than the Shanker
distribution and other competing models that
belong to the Marshall-Olkin G family of
distributions. |
|
 |
|
Cite: Sara Ziari, S.M.T.K. MirMostafaee
THE MARSHALL-OLKIN EXTENDED SHANKER DISTRIBUTION
AND ITS APPLICATIONS . Reliability: Theory &
Applications. 2025, March 1(82):942-956. DOI: https://doi.org/10.24412/1932-2321-2025-182-942-956
|
|
|
|
ANALYSIS OF THERMAL PROCESSES
IN A CONTROLLED ASYNCHRONOUS MOTOR |
957-965 |
|
|
S.Y. Shikhaliyeva |
|
|
|
This article examines the reliability and risks
associated with technical systems involved in
the conversion of mechanical energy to
electrical energy, focusing on the thermal
dynamics of electric machines. It explores the
processes of heat generation due to energy
losses, primarily heat dissipation, and the
effects of temperature increases on the
longevity and performance of the machine. The
cooling systems essential for managing heat
transfer and minimizing overheating are analyzed,
considering factors such as heat conduction,
convection, and radiation, as well as the role
of electrohydraulic and aerodynamic systems in
optimizing heat exchange. Special attention is
given to the impact of temperature fluctuations
on the insulation materials of electric machines,
with an emphasis on how overheating accelerates
insulation degradation and reduces machine
lifespan. The paper further discusses the
intricate relationship between cooling
efficiency, machine power, and the economic
implications of designing effective thermal
management systems. Moreover, the challenges of
selecting and optimizing cooling strategies in
electric machine design are highlighted,
considering both technical and economic factors.
Lastly, the study delves into ventilation
calculations necessary to ensure efficient
airflow and cooling, using practical equations
and methods for determining pressure loss and
fan performance, underscoring the complexity and
importance of achieving optimal temperature
conditions for long-term, reliable machine
operation. |
|
 |
|
Cite: S.Y. Shikhaliyeva ANALYSIS OF
THERMAL PROCESSES IN A CONTROLLED ASYNCHRONOUS
MOTOR . Reliability: Theory & Applications.
2025, March 1(82):957-965. DOI: https://doi.org/10.24412/1932-2321-2025-182-957-965
|
|
|
|
ENHANCING ENERGY SYSTEM
RELIABILITY: MODERN APPROACHES AND SOLUTIONS |
966-971 |
|
|
Sh.V. Ismayilova, Z.A. Isgandarova, K.M.
Mukhtarova |
|
|
|
The article analyzes methods for improving the
reliability of energy systems considering the
SAIDI and SAIFI indicators, which reflect the
duration and frequency of power outages.
Approaches are discussed, including the
implementation of intelligent monitoring systems,
Automated Distribution Management Systems (ADMS),
as well as distributed generation and redundancy.
The study confirms that the integrated use of
these technologies significantly enhances
network reliability, reducing SAIDI and SAIFI
indices, and evaluates the economic efficiency
of these solutions, demonstrating their
long-term profitability. |
|
 |
|
Cite: Sh.V. Ismayilova, Z.A. Isgandarova,
K.M. Mukhtarova ENHANCING ENERGY SYSTEM
RELIABILITY: MODERN APPROACHES AND SOLUTIONS .
Reliability: Theory & Applications. 2025, March
1(82):966-971. DOI: https://doi.org/10.24412/1932-2321-2025-182-966-971
|
|
|
|
SELECTION OF A BAYESIAN DOUBLE
SAMPLING PLAN THROUGH MARKOV DEPENDENCE METHOD
IN DRUG DISCOVERY |
972-980 |
|
|
Kaviyarasu V, Karthick |
|
|
|
Most of the pharmaceutical firms have worked
hard to maintain quality in their manufacturing
products like medicines and biological
instruments using the principles of statistical
quality control to optimize the fault model. In
this field, one of the pioneering statistical
methods is acceptance sampling by attributes. A
sampling plan is used to assess the quality of
goods, keep an eye on the quality of the
materials, and confirm whether or not the yields
are defect-free or not. When posterior knowledge
about the parameter is known, the Bayesian
strategy provides a more robust statistical
method for reaching a suitable conclusion. In
this article a new Bayesian double sampling plan
under stochastic modeling was established. This
is achieved by various characteristics of
sampling plan explicit by its random variable
and its probability function. This plan is
studied through the Gamma- Poisson model to
safeguard both the producer and consumer by
minimizing the Average Sample Number and Total
Cost. Necessary tables and figures are
constructed for the selection of optimal plan
parameters and suitable illustrations are
provided that are applicable under
pharmaceutical industries. |
|
 |
|
Cite: Kaviyarasu V, Karthick SELECTION OF
A BAYESIAN DOUBLE SAMPLING PLAN THROUGH MARKOV
DEPENDENCE METHOD IN DRUG DISCOVERY. Reliability:
Theory & Applications. 2025, March
1(82):972-980. DOI: https://doi.org/10.24412/1932-2321-2025-182-972-980
|
|
|
|
OPTIMIZATION ANALYSIS OF
UNRELIABLE MULTI-SERVER QUEUEING SYSTEM WITH
BERNOULLI SCHEDULE WORKING VACATION,
THRESHOLD-BASED RECOVERY POLICY, AND IMPATIENCE |
981-995 |
|
|
Hayat Ramdani, Amina Angelika Bouchentouf,
Lahcene Yahiaoui |
|
|
|
This paper analyzes an unreliable multi-server
queueing system incorporating working vacations,
Bernoulli interruptions, breakdowns with a
threshold recovery policy, balking, abandonment,
and retention. During the break period, if there
are customers in the queue, the servers may
either resume normal service or continue their
vacation. Customers arriving while the system is
saturated are rejected. Failures occur
unexpectedly but only when at least one customer
is present in the system. Recovery procedures
remain in effect until the total number of
customers surpasses a predefined threshold.
Using matrix-analytic methods, we derive
steady-state solutions and explicit formulas for
various performance indicators. Further, we
explore cost parameter optimization. |
|
 |
|
Cite: Hayat Ramdani, Amina Angelika
Bouchentouf, Lahcene Yahiaoui OPTIMIZATION
ANALYSIS OF UNRELIABLE MULTI-SERVER QUEUEING
SYSTEM WITH BERNOULLI SCHEDULE WORKING VACATION,
THRESHOLD-BASED RECOVERY POLICY, AND IMPATIENCE.
Reliability: Theory & Applications. 2025, March
1(82):981-995. DOI: https://doi.org/10.24412/1932-2321-2025-182-981-995
|
|
|
|
CLASSICAL AND BAYESIAN
ESTIMATION OF EXPONENTIATED INVERSE RAYLEIGH
DISTRIBUTION BASED ON RECORD VALUES |
996-1008 |
|
|
Iftkhar Khan, Zaki Anwar, Zakir Ali |
|
|
|
In this article explores two approaches for
estimating the parameters of the exponentiated
inverse Rayleigh distribution (EIRD) using
record values: Classical estimation and Bayesian
estimation. In classical estimation, maximum
likelihood estimators (MLE’s) and the asymptotic
confidence intervals are derived based on the
observed Fisher information matrix of the
parameters. In Bayesian estimation, estimators
of the parameters are obtained under the square
error loss function. This involves using
Tierney-Kadane’s approximation (TK) and Markov
chain Monte Carlo (MCMC) methods for Bayesian
computation. Additionally, the article
constructs the highest posterior credible
intervals of the parameters using the MCMC
method. To evaluate the performance of these
estimators, a Monte Carlo simulation study is
conducted to compare their behavior. Finally, a
real data analysis is presented to illustrate
the application of the methods discussed in the
article. |
|
 |
|
Cite: Iftkhar Khan, Zaki Anwar, Zakir Ali
CLASSICAL AND BAYESIAN ESTIMATION OF
EXPONENTIATED INVERSE RAYLEIGH DISTRIBUTION
BASED ON RECORD VALUES. Reliability: Theory &
Applications. 2025, March 1(82):996-1008. DOI: https://doi.org/10.24412/1932-2321-2025-182-996-1008
|
|
|
|
THE POISSON-SUJA DISTRIBUTION
AND ITS APPLICATIONS IN BIOLOGICAL COUNT DATA
SETS |
1009-1019 |
|
|
Rama Shanker, Joyshree Saharia, Kamlesh Kumar
Shukla |
|
|
|
The Poisson-Suja distribution which is a Poisson
mixture of Suja distribution has been proposed.
The descriptive statistics based on moments
including coefficient of variation, skewness,
kurtosis and index of dispersion has been
derived and studied. Over-dispersion,
unimodality and increasing hazard rate
properties of the distribution have been studied.
The method of moment and the method of maximum
likelihood have been discussed for estimating
parameters. Applications and the goodness of fit
the distribution and its comparison with other
one-parameter discrete distributions have also
been presented. It was found more closer fit
than other compared distributions. So, it can be
considered as good discrete distribution for
count datasets. |
|
 |
|
Cite: Rama Shanker, Joyshree Saharia,
Kamlesh Kumar Shukla THE POISSON-SUJA
DISTRIBUTION AND ITS APPLICATIONS IN BIOLOGICAL
COUNT DATA SETS . Reliability: Theory &
Applications. 2025, March 1(82):1009-1019. DOI: https://doi.org/10.24412/1932-2321-2025-182-1009-1019
|
|
|
|
A NEW TRANSMUTED PROBABILITY
MODEL: PROPERTIES AND APPLICATIONS |
1020-1034 |
|
|
Khawar Javaid, Bilal Ahmad Para |
|
|
|
In this article, we introduced a new three
parameter continuous probability model by
extending a two parameter log-logistic
distribution using the quadratic rank
transmutation map technique. We provide a
comprehensive description of the statistical
properties of the newly introduced model. Robust
measures of skewness and kurtosis of the
proposed model have also been derived along with
the moment generating function, characteristic
function, reliability function and hazard rate
function of the proposed model. The estimation
of the model parameters is performed by maximum
likelihood method followed by a Monte Carlo
simulation procedure. The applicability of this
distribution to modeling real life data is
illustrated by two real life examples and the
results of comparison to base distribution in
modeling the data are also exhibited. |
|
 |
|
Cite: Khawar Javaid, Bilal Ahmad Para A
NEW TRANSMUTED PROBABILITY MODEL: PROPERTIES AND
APPLICATIONS. Reliability: Theory & Applications.
2025, March 1(82):1020-1034. DOI: https://doi.org/10.24412/1932-2321-2025-182-1020-1034
|
|
|
|
MULTI-OBJECTIVE PROBLEM WITH
MULTIPLE JOBS ASSIGNED TO A SINGLE MACHINE
WITHIN AVAILABLE COST UNDER UNCERTAIN
ENVIRONMENT |
1035-1048 |
|
|
Aamir Khan, Quazzafi Rabbani, Ahteshamul Haq |
|
|
|
The assignment problem is a key challenge in
optimization and operations research, finding
applications in diverse real-world scenarios.
The Hungarian method is a widely employed
algorithm for solving this problem, especially
in its balanced form. However, for unbalanced
assignment problems, where tasks outnumber
resources (or vice versa), an extension is
necessary. One common approach introduces a
dummy resource, but this may leave tasks
unassigned. The Modified Hungarian method
improves upon the standard algorithm for
unbalanced problems, ensuring that all tasks are
assigned to real resources. This is achieved by
modifying the cost matrix and algorithm steps to
accommodate additional tasks and resources.
Triangular fuzzy numbers are discussed when
exact parameter information is undefined, and
fuzzy programming is applied to determine a
compromise result. Incorporating cost and profit
per resource, the Modified Hungarian algorithm
addresses the problem of unspecified job
allocations to a single machine by introducing a
cost parameter for each machine. The methodology
is demonstrated on a numerical example for
better comprehension. |
|
 |
|
Cite: Aamir Khan, Quazzafi Rabbani,
Ahteshamul Haq MULTI-OBJECTIVE PROBLEM WITH
MULTIPLE JOBS ASSIGNED TO A SINGLE MACHINE
WITHIN AVAILABLE COST UNDER UNCERTAIN
ENVIRONMENT . Reliability: Theory & Applications.
2025, March 1(82):1035-1048. DOI: https://doi.org/10.24412/1932-2321-2025-182-1035-1048
|
|
|
|
RELATIONSHIP BETWEEN THE
LEIMKUHLER CURVE AND RELIABILITY MEASURE
CONCEPTS IN DOUBLE TRUNCATED VARIABLES |
1049-1060 |
|
|
Vahideh Asghari, Gholamreza Mohtashami
Borzadaran, Hadi Jabbari |
|
|
|
This paper investigates the application of
Leimkuhler curve and doubly truncated
distributions in informetrics. Leimkuhler curve,
ranking sources in descending order, emerges as
a key tool for identifying efficient information
sources. The study introduces a random variable
representing the age of cited articles,
influencing the probability distribution in
retrospective citation analysis. Reliability
measures, including mean residual life function
and mean past residual life function are
employed to analyze engineering and reliability
aspects in informometric data. Truncation in
probability distributions, particularly the
doubly truncated distribution, is explored,
revealing its broad applicability. The
relationship between the Leimkuhler curve and
truncated distributions will also be examined. |
|
 |
|
Cite: Vahideh Asghari, Gholamreza
Mohtashami Borzadaran, Hadi Jabbari RELATIONSHIP
BETWEEN THE LEIMKUHLER CURVE AND RELIABILITY
MEASURE CONCEPTS IN DOUBLE TRUNCATED VARIABLES.
Reliability: Theory & Applications. 2025, March
1(82):1049-1060. DOI: https://doi.org/10.24412/1932-2321-2025-182-1049-1060
|
|
|
|
MATHEMATICAL ANALYSIS OF THE
MECHANICAL PART OF THE DESIGN SCHEME OF THE
ELECTRIC DRIVE OF A HYBRID ELECTRIC MACHINE |
1061-1069 |
|
|
S.A. Khanahmedova |
|
|
|
The paper analyzes the mechanical part of the
design scheme of the electric drive of a hybrid
electric machine, which is a key stage in the
design and research of automatic control systems.
The main elements of a mechanical system, a
model of a real mechanical system connected to
an electric drive, including all moving elements,
transmission mechanisms, and actuators that
convert electrical energy into mechanical work,
are considered. The presented calculation scheme
allows you to analyze dynamic processes, i.e. to
study the system's behavior over time, to
determine stability, fluctuations, and other
characteristics. Calculations of various mass
systems are performed using the capabilities of
the MATLAB/Simulink software package for a
three-mass and two-mass system. These models can
be used for different systems with different
parameters. To draw up a structural diagram, the
elements of the mechanical part and the
connections between the elements, the types of
these connections (rigid, elastic) and the
directions of motion transmission are determined.
Structural diagrams are used to analyze the
dynamic characteristics of the system, determine
transients, stability, and vibrations. |
|
 |
|
Cite: S.A. Khanahmedova MATHEMATICAL
ANALYSIS OF THE MECHANICAL PART OF THE DESIGN
SCHEME OF THE ELECTRIC DRIVE OF A HYBRID
ELECTRIC MACHINE . Reliability: Theory &
Applications. 2025, March 1(82):1061-1069. DOI: https://doi.org/10.24412/1932-2321-2025-182-1061-1069
|
|
|
|
ZERO TRUNCATED POISSON
REGRESSION MODEL FOR REPRODUCTIVE PATTERNS ON
COUNT DATA |
1070-1088 |
|
|
B. Muniswamy, M. V. Lavanya |
|
|
|
The number of children ever born is an important
measure for understanding fertility patterns,
which impact demographic structures and
population growth. The problem relates to the
modeling of count data that includes the
truncation of zero values, specifically focusing
on women who have experienced childbirth at
least once. This study analyzes the factors that
influence the number of children ever born (CEB)
among women aged 15 to 50 in Andhra Pradesh,
utilizing data from the National Family Health
Survey (NFHS-5) conducted from 2019 to 2021. The
study used Zero-Truncated Poisson (ZTP) and
Zero-Truncated Generalized Poisson (ZTGP) models
to identify major determinants, including
religion, kind of cooking fuel used, place of
delivery, wealth, age, and fertility choices.
The ZTP regression model was found to be the
best model and identifies significant
determinants such as religion, wealth, age, and
fertility preferences. The results show that
rural residence, Muslim faith, and older age
groups are associated with higher CEB, while
wealthier women tend to have fewer children. The
study shows the importance of implementing
focused reproductive health activities,
specifically in rural regions, to manage
population growth and enhance the health
outcomes of both mothers and children. |
|
 |
|
Cite: B. Muniswamy, M. V. Lavanya ZERO
TRUNCATED POISSON REGRESSION MODEL FOR
REPRODUCTIVE PATTERNS ON COUNT DATA .
Reliability: Theory & Applications. 2025, March
1(82):1070-1088. DOI: https://doi.org/10.24412/1932-2321-2025-182-1070-1088
|
|
|
|
AN M/G/1 RETRIAL QUEUE WITH
WORKING VACATION, NON PERSISTENT CUSTOMERS AND A
WAITING SERVER |
1089-1099 |
|
|
R. Keerthana |
|
|
|
An M/G/1 retrial queue with working vacation,
non persistent customers and a waiting server is
taken into consideration in this study. Both
retrial times and service times are assumed to
follow general distribution and the waiting
server follows an exponential distribution.
Before switching over to a vacation the server
waits for some arbitrary amount of time and so
is called a waiting server. During the working
vacation period customers are served at a lesser
rate of service. We obtain the PGF for the
number of customers and the mean number of
customers in the invisible waiting area which is
acquired by utilizing the supplementary variable
technique. We compute the waiting time
distribution. Out of interest a few special
cases are conferred. Numerical outcomes are
exhibited. |
|
 |
|
Cite: R. Keerthana AN M/G/1 RETRIAL QUEUE
WITH WORKING VACATION, NON PERSISTENT CUSTOMERS
AND A WAITING SERVER. Reliability: Theory &
Applications. 2025, March 1(82):1089-1099. DOI: https://doi.org/10.24412/1932-2321-2025-182-1089-1099
|
|
|
|
REPETITIVE SAMPLING INSPECTION
PLAN UNDER TRUNCATED LIFETEST BASED ON ONE
PARAMETER POLYNOMIAL EXPONENTIAL DISTRIBUTION |
1100-1115 |
|
|
Anumita Mondal, Sudhansu S. Maiti |
|
|
|
This article constructs a Repetitive Sampling
Inspection Plan under Truncated life test (RSIPTL)
when the lifetime follows the One Parameter
Polynomial Exponential (OPPE) family of
distributions. In RSIPTL, a lot can be accepted
or rejected in the first, second, and so on,
based on the number of defective items in each
sample. The OPPE has infinite support. It has
transformed into its unit form to utilize finite
support, i.e., having the support (0, 1). The
Lindley distribution, a particular choice of the
OPPE, has been studied in detail. We obtained
the minimum number of items required in a lot to
satisfy the consumer risk. Extensive tables are
prepared for easy understanding and use of the
plan for industrial workers. The RSIPTL is
compared with a single sampling plan (SSP) and a
two-stage reliability acceptance sampling plan (TSRASP)
for Lindley and Exponential distributions. Two
data sets are discussed and comparative
statements are made with respect to the proposed
plan. |
|
 |
|
Cite: Anumita Mondal, Sudhansu S. Maiti
REPETITIVE SAMPLING INSPECTION PLAN UNDER
TRUNCATED LIFETEST BASED ON ONE PARAMETER
POLYNOMIAL EXPONENTIAL DISTRIBUTION. Reliability:
Theory & Applications. 2025, March
1(82):1100-1115. DOI: https://doi.org/10.24412/1932-2321-2025-182-1100-1115
|
|