Stefanka
Chukova
Ph. Doctor
Degree
information:
-
BSc Mathematics,
University of Sofia, Sofia, Bulgaria
-
MSc Mathematics
(Probability and Statistics), University of Sofia, Department of
Mathematics and Computer Science, Sofia, Bulgaria, Thesis: On
the Statistics of Branching Processes with Immigration, 1978
-
PhD Mathematics
(Probability and Statistics), Department of Mathematics and
Computer Science, University of Sofia, Sofia, Bulgaria,
Dissertation: Mathematical Models and Methods for Determining
Warranty Periods, 1988.
Specialization
Theoretical
Probability, Applied Probability and Statistics, Reliability
Theory, Warranty Analysis.
Present
position and employment record
-
Jan 2006 – Present
Reader in Operations Research (tenured), School of Mathematics,
Statistics and Computer Science, Victoria University of
Wellington, Wellington, New Zealand
-
July 2001 – Dec 2005
Senior Lecturer in Statistics and Operations Research, School of
Mathematical and Computing Sciences (tenured), Victoria
University of Wellington, Wellington, New Zealand
-
Apr 1996 - July 2001
Associate Professor in Mathematics and Statistics (tenured),
Kettering University (former GMI Engin. and Manag. Institute,
Flint, MI)
Recent
and current research
-
Mathematical Models
and Methods in Warranty Analysis; Warranty Analysis is a
financial implementation of Reliability Theory. New class of
Models has been introduced - warranty models for complex
products; (Research grant IK9-245/90, Technical University of
Sofia).
-
Extensions of Warranty
Models in two or more dimensional case. Optimisation under
incomplete information. Applications to industrial Products.
(Research grant on Mathematical methods in Reliability and
Quality Control 43-87, Council of Bulgarian Science).
-
Characterization of a
new family of probability distributions having
almost-lack-of-memory property, generalization of the
exponential, geometric and similar distributions (Research Grant
on Risk Theory #MM60-91 with Bulgarian National Science
Foundation).
-
Statistical
estimations for the parameters of Branching Processes.
-
Numerical and
algorithmic methods in application of queuing models in computer
networks system.
-
Statistical studies
with applications in Environmental Science.
-
Studies in Warranty
Analysis related to the depth of repair and approaches to model
it.
-
Batch Markovian
Arrival Process – simulation, parameter estimation.
-
Studies on bivariate
failure models with possible censoring and their application in
two-dimensional warranty for auto industry.
-
Studies on optimal
warranty repair strategies.
Professional activities
-
Acted as guest Editor
for International Journal of Quality and Reliability Management,
2005
-
Associate editor for
Journal of Applied Mathematics and Decision Sciences (JAMDS),
2006
Publications
-
S.Chukova, Y.Hayakawa,
(2003), Warranty Cost Analysis: Renewing Warranty with Non- Zero
Repair Time, Research Report 03-06, School of Mathematical
and Computing Sciences, Victoria University of Wellington, NZ,
pp. 1-14.
-
S.Chukova, Y.Hayakawa,
(2004), Warranty Cost Analysis: Non- Zero Repair Time, Applied
Stochastic Models in Business and Industry, 20 (1): pp.
59-71.
-
S.Chukova, R.Arnold,
D.Wang, (2004) Warranty Analysis: An Approach to modelling
Imperfect Repairs, International Journal of Production
Economics, 89(1),pp. 57-68
-
S.Chukova, Y.Hayakawa,
(2004), Warranty Cost Analysis: Renewing Warranty with Non- Zero
Repair Time, International Journal of Reliability, Quality and
Safety Engineering , 11(2), pp.1-20.
-
S.Chukova, Y.Hayakawa,
(2004), Warranty and Imperfect Repairs, Proceedings of the Asian
International Workshop on Advance Reliability Models, Hiroshima,
Japan, August 26-27, pp.81-88.
-
Dimitrov, B., Chukova
S., Khalil Z., (2004), "Warranty Costs: An Age - Dependent
Failure/Repair Model", Naval Research Logistics, 51, pp.959 –
976.
-
D. Wang, S. Chukova, C
D Lai, (2004) On the relationship Between Regression Analysis
and Mathematical Programming, Journal of Applied Mathematics and
Decision Sciences, 8(2), pp. 131-140
-
S.Chukova, Y.Hayakawa,
(2005), Warranty Cost Analysis: Quasi-Renewal Interrepair Times,
International Journal of Quality and Reliability Management ,
22(7), 687 - 698
-
S.Chukova, J.Robinson,
(2005), "Estimating Mean Cumulative Functions from Truncated
Automotive Warranty Data", Mathematical and Statistical Methods
in Reliability, series on Quality, Reliability and Engineering
Statistics, A. Wilson, N. Limnios, S Keller-McNulty, Y. Armijo (eds),
World Scientific, Singapore, 121 – 136
-
Wang, D., Chukova, S.,
Lai C.D., (2005) Reducing the Quadratic Programming Problem to
Regression Problem: Stepwise Algorithm, European Journal of
Operation Research 164(1), pp.79-88.
-
S.Chakravarty,
S.Chukova, (2005), A finite capacity resequencing model with
Markovian Arrivals, Asia-Pacific Journal of Operations Research,
22 (3), pp. 409 – 443.
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S. Chukova, M.Johnston,
"Two-dimensional warranty repair strategy based on minimal and
complete repairs",(accepted in Mathematical and Computer
Modelling)
-
D. Christozov, S.
Chukova, P.Mateev, A Measure of Risk Caused by Information
Asymmetry in e-Commerce (submitted)
INVITED
LECTURES and contributed papers
-
"Warranty and
Imperfect repairs" (co-author Dr.Yu Hayakawa), AIWARM 2004,
Hiroshima, Japan, August 26-27, 2004, Organising a special
session on Warranty Analysis.
-
Seminar " Warranty and
Quasi-Renewal Repair times", King Mongkut's University of
Technology Thonburi, Bangkok, Thailand, October, 2004
-
"Warranty Analysis: An
Overview", Operations Research Colloquium, Spring 2005,
Department of Statistics and Operations Research, The University
of North Carolina at Chapel Hill, Feb, 2005.
-
"Warranty Analysis",
31st Summer School "Applied Mathematics in Economics and
Engineering", invited speaker and chairing OR session, Sozopol,
Bulgaria, June, 2005.
-
" Warranty repair
strategy in R2 ", (co-author Dr. M. Johnston), 40th ORSNZ
conference, chairing a session Wellington, NZ, December 2-3,
2005.
-
"Batch Markovian
Arrival Process", Workshop on Hidden Markov Models and Complex
Systems II, chairing a session, Wellington, NZ, 5-8 December,
2005.
Personal
Address:
School of Mathematics, Statistics and Computer Science
Victoria University of Wellington
P.O.Box 600
tel.(+644) 463 6786
fax (+644) 463 5045
e-mail:
schukova@mcs.vuw.ac.nz
Languages: English,
Bulgarian, Russian
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