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Yu.K. Belyaev 

BORIS VLADIMIROVICH GNEDENKO (01.01.1912 – 27.12.1995)

This article was published on journal «Markov Processes and Related Fields»  (2014, Volume 20, Number 3). This article contain papers based on the talks given at the international conference “Probability Theory and Its Applications” (Moscow, June 26–30, 2012) in commemoration of the centennial of Boris Vladimirovich Gnedenko (01.I.1912 – 27.XII.1995).

Sana Shahab, Sadia Anwar, Arif Ul Islam

OPTIMAL DESIGN OF STEP STRESS PARTIALLY ACCELERATED LIFE TEST UNDER PROGRESSIVE TYPE-II CENSORED DATA WITH RANDOM REMOVAL FOR FRECHET DISTRIBUTION

In this article, progressive censoring and step stress partially accelerated life test are combined to develop a step-stress PALT with Progressively type-II Censored Data with the random removal. The removals from the test are assumed to have binomial distribution and uniform distribution and the life time of the testing products are considered to follow Frechet distribution. The parameters are estimated by using the maximum likelihood method and asymptotic confidence interval estimates of the model parameters are also evaluated by using Fisher information matrix. Statistically optimal PALT plans are developed such that the Generalized Asymptotic Variance (GAV) of the Maximum Likelihood Estimators (MLEs) of the model parameters at design stress is minimized. At the end, simulation study is performed to illustrate the statistical properties of the parameters.

G.Sh. Tsitsiashvili, M.A. Osipova,A.S. Losev

ASYMPTOTIC ANALYSIS OF FEW NODES FAILURE IN ORIENTED RANDOM GRAPH

In this paper an oriented graph with high reliable nodes is considered. A node stops its work if there is failed node which has a way to this node. Asymptotic formulas for a calculation of a probability that some nodes in the graph stop their work are obtained for different conditions on a graph structure and on a number of the nodes. These formulas allow to obtain conditions on reserve in considered graphs if nodes have different failure probabilities.

Gapanovich V.A., Shubinsky I.B., Rozenberg E.N., Zamyshlyaev A.M.

SYSTEM OF ADAPTIVE MANAGEMENT OF RAILWAY TRANSPORT INFRASTRUCTURE TECHNICAL MAINTENANCE (URRAN PROJECT)

The paper considers issues related to well-balanced management of resources for JSC RZD infrastructure maintenance under the conditions of scarce finances. The authors have made an analysis of the RAMS methodology and its further transformation into a complex of Russian standards and normative and methodology documentation base applied for management of life cycle processes of railway transport systems (URRAN) in JSC RZD. The paper studies the prerequisites and key aspects for development of the innovative technology of management decision making support for increase of dependability and functional safety of transport in Russia at all life-cycle stages.

Farhadzadeh E.M., Muradaliyev A.Z., Farzaliyev Y.Z.

TO THE QUESTION ON DISTRIBUTION OF LOADING BETWEEN POWER UNITS TES

Practical realization of existing programs of calculation of distribution of loading between power units TES being in working order demands authentic power characteristics. In conditions of increasing ageing the core and auxiliaries of power units, maintenance of reliability of power characteristics in itself represents serious problems. The method of distribution of loadings between power units TES in view of their technical condition, based on registered technical and economic parameters is developed. Practical approbation of this method testifies to essential advantage of a recommended method, as in comparison with uniform distribution of loading between power units, and in comparison with the intuitive approach to distribution of loading.

Guliyev H.B., Farkhadov Z.I., Mammadov J.F.

SYSTEM OF AUTOMATIC REGULATION OF REACTIVE POWER BY MEANS OF FUZZY LOGIC

For increasing efficiency of distribution of electric energy the problem of indemnification of reactive-power by means of practical and theoretical researches is considered. On the basis of theoretical researches the algorithm of control of power of condenser by low sensitive to parametric indignations with the use of fuzzy theory is worked out.

S. C. Sharma, R. Chugh, N. Mather

SIRFrt METHOD: ASSESSING AND IMPROVING MAINTENANCE RELIABILITY

The focus of this paper is to assess ways to improve plant availability of an organisation in order to reduce its reactive maintenance from its current level of 30%. The pharmaceutical products the organisation (name withheld) produces are in short supply. It is vital the equipment that produces these products are reliable and produce quality products all the time. Loss of one batch due to equipment malfunction not only equates to loss of revenue but also the loss of vital medications which could jeopardise patient safety. This paper solely focuses and reports on the SIRFrt method to assess plant reliability in order to achieve maintenance excellence. There are seven elements that can impact maintenance excellence, however the focus of this paper is on reliability improvement since the audit scores were low in comparison to the other elements considered under the SIRFrt method. As a result of using feedback gained through the SIRFrt method assessment, it is anticipated that reactive maintenance will reduce below 10%