H. Okamura and T. Dohi, Phase-type software reliability model: Parameter estimation algorithms with grouped data, Annals of Operations Research (in press).
DOI 10.1007/s10479-015-1870-0
H. Okamura and T. Dohi, Dynamic power management with optimal time-out policies in server system, IEEE Systems Journal (Early access articles).
T. Dohi, H. Okamura and K. S. Trivedi, Optimal periodic software rejuvenation policies based on interval reliability criteria, International Journal of Adaptive, Resilient and Autonomic Systems (in press).
H. Okamura and T. Dohi, Analysis of optimal restart policies for software systems, Journal of Japan Industrial Management Association, vol. 66, no. 4E, pp. 416-425, 2016
C. Luo, H. Okamura and T. Dohi, Optimal planning for open source software updates, Proceedings of the Institution of Mechanical Engineerings, Part O: Journal of Risk and Reliability, vol. 230, no. 1, pp. 44-53, February 2016.
DOI 10.1177/1748006X15589208
H. Okamura and T. Dohi, PH fitting algorithm and its application to reliability engineering, Journal of the Operations Research Society of Japan, vol. 59, no. 1, pp. 72-109, January 2016.
DOI 10.15807/jorsj.59.72
H. Okamura and T. Dohi, A Markov decision process approach to dynamic power management in a cluster system, IEEE Access, vol. 3, issue 1, pp. 1-9, December 2015.
DOI 10.1109/ACCESS.2015.2508601
J. Zheng, H. Okamura and T. Dohi, Survivability analysis of VM-based intrusion tolerant systems, IEICE Transactions on Information and Systems (D), E98-D (12), 2082-2090, 2015.
DOI 10.1587/transinf.2015PAP0007
H. Okamura, J. Guan, C. Luo and T. Dohi, Quantifying resiliency of virtualized system with software rejuvenation, IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (A), E98-A(10), 2051-2059, 2015.
DOI 10.1587/transfun.E98.A.2051
H. Okamura, Z. Yi and T. Dohi, Network survivability modeling and analysis for power-aware MANETs by Markov regenerative processes, Telecommunication Systems Journal, 60, 471-484, 2015
DOI 10.1007/s11235-015-9989-5
J. Zheng, H. Okamura and T. Dohi, Availability importance measures for virtualized system with live migration, Applied Mathematics, vol. 6, pp. 359-372, 2015.
DOI 10.4236/am.2015.62034
C. Luo, H. Okamura and T. Dohi (2014) Performance evaluation of snapshot isolation in distributed database system under failure-prone environment, Journal of Supercomputing, vol. 70, no. 3, pp. 1156-1179.
H. Okamura, K. Yamamoto and T. Dohi (2014) Transient analysis of software rejuvenation policies in virtualized system: phase-type expansion approach, Quality Technology and Quantitative Management Journal, vol. 11, no. 3, pp. 335-352.
H. Okamura, R. Watanabe and T. Dohi (2014) Variational Bayes for phase-type distribution, Communications in Statistics -Simulation and Computation, vol. 43, no. 8, pp. 2031-2044.
H. Okamura and T. Dohi (2013) Optimal trigger time of software rejuvenation under probabilistic opportunities, IEICE Transactions on Information & Systems (D), vol. E96-D, no. 9, pp. 1933-1940.
H. Okamura, H. Kishikawa and T. Dohi (2013) Application of deterministic annealing EM algorithm to MAP/PH parameter estimation, Telecommunication Systems Journal, vol. 54, no. 1, pp. 79-90.
H. Okamura, T. Hirata and T. Dohi (2013) Semi-parametric approach for software reliability evaluation using mixed gamma distributions, International Journal of Software Engineering and Its Applications, vol. 7, no. 4, pp. 401-414.
H. Okamura, T. Dohi and K. S. Trivedi (2013) Improvement of expectation-maximization algorithm for phase-type distributions with grouped and truncated data, Applied Stochastic Models in Business and Industry, vol. 29, pp. 141-156.
S. Hiroyama, T. Dohi and H. Okamura (2013) Aperiodic checkpoint placement algorithms -survey and comparison-, Journal of Software Engineering and Applications, vol. 6, no. 4A, pp. 41-53.
H. Okamura, M. Tokuzane and T. Dohi (2013) Quantitative security evaluation for software system from vulnerability database, Journal of Software Engineering and Applications, vol. 6, no. 4A, pp. 15-23.
H. Okamura, T. Dohi and S. Osaki (2013) Software reliability growth models with normal failure time distributions, Reliability Engineering and System Safety, vol. 116, pp. 135-141.
H. Okamura and T. Dohi (2013) Dynamic software rejuvenation policies in a transaction-based system under Markovian arrival processes, Performance Evaluation, vol. 70, no. 3, pp. 197-211.
B. Zhou, H. Okamura, T. Dohi (2013) Enhancing performance of random testing through Markov chain Monte Carlo methods, IEEE Transactions on Computers, vol. 62, no. 1, pp. 186-192.
B. Zhou, H. Okamura, T. Dohi (2012) Application of Markov chain Monte Carlo random testing to test case prioritization in regression testing, IEICE Transactions on Information and Systems (D), E95-D(9), 2219-2226.
T. Dohi, H. Okamura and K. S. Trivedi (2012) Comparison of software cost models with rejuvenation under two steady-state criteria, International Journal of Reliability and Quality Performance, vol. 3, no. 1, pp. 1-13.
T. Ishii, T. Dohi, H. Okamura (2012) Software reliability prediction based on least squares estimation, Quality Technology and Quantitative Management, 9(3), 243-264.
X. Xiao, H. Okamura, T. Dohi (2012) NHPP-based software reliability models using equilibrium distribution, IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (A), E95-A(5), 894-902.
H. Okamura, T. Dohi (2011) Software safety assessment based on a subordinated Markov chain, International Journal of Systems Assurance Engineering and Management, 1(4), 307-315.
H. Okamura, T. Dohi, K. S. Trivedi (2011) A refined EM algorithm for PH distributions, Performance Evaluation, 68(10), 938-954.
H. Okamura, T. Dohi (2010) Comprehensive evaluation of aperiodic checkpointing and rejuvenation schemes in operational software system, Journal of Systems and Software, 83(9), 1591-1604.
H. Okamura, T. Dohi (2010) An EM-based scheme for record value statistics models in software reliability estimation, International Journal of Software Engineering and Its Applications, 20, 43-52.
Y. Yamaguchi, H. Okamura, T. Dohi (2010) A variational Bayesian approach for estimating parameters of a mixture Erlang distribution, Communications in Statistics - Theory and Methods, 39(13), 2333-2350.
H. Okamura, T. Dohi, K. S. Trivedi (2009) Markovian Arrival Process Parameter Estimation with Group Data, IEEE/ACM Transactions on Networking, 17(4), 1326-1339.
H. Okamura, T. Dohi (2009) Software reliability modeling based on capture-recapture sampling, IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (A), E92-A(7), 1615-1622.
K. Ohishi, H. Okamura, T. Dohi (2009) Gompertz software reliability model: estimation algorithm and empirical validation, Journal of Systems and Software, 82(3), 535-543.
K. Tateishi, H. Okamura, T. Dohi (2009) Transient analysis of Internet-worm propagation based on simple birth and death process, International Journal of Reliability and Quality Performance, 1(1), 1-9.
H. Okamura, T. Dohi (2008) Software reliability modeling based on mixed Poisson distributions, International Journal of Reliability, Quality and Safety Engineering, 3(5), 557-574.
H. Okamura, K. Iwamoto, T. Dohi (2006) A DP-based checkpointing scheme in real-time applications, International Journal of Reliability, Quality and Safety Engineering, 13(4), 323-340.
H. Okamura, K. Iwamoto, T. Dohi (2006) Optimal rejuvenation scheduling of distributed computation based on dynamic programming, Journal of Computer Science, 2(6), 505-512.
H. Okamura, T. Dohi (2006) EM algorithm for discrete software reliability models: a unified parameter estimation method, Opsearch, 42(4), 355-377.
T. Ozaki, T. Dohi, H. Okamura, N. Kaio (2006) Distribution-free checkpoint placement algorithms based on min-max principle, IEEE Transactions on Dependable and Secure Computing, 3(2), 130-140.
H. Okamura, S. Miyahara, T. Dohi (2005) Rejuvenating communication network system with burst arrival, IEICE Transactions on Communications (B), E88-B(12), 4498-4506.
H. Okamura, T. Dohi, S. Osaki (2003) Phase type approximation for optimal auto-sleep scheduling, Mathematical and Computer Modelling, 38(11-13), 1391-1398.
H. Okamura, H. Fujio, T. Dohi (2003) Fine-grained shock models to rejuvenate software systems, IEICE Transactions on Information and Systems (D), E86-D(10), 2165-2171.
T. Dohi, K. Iwamoto, H. Okamura, N. Kaio (2003) Discrete Availability Models to Rejuvenate a Telecommunication Billing Application, IEICE Transactions on Communications (B), E86-B(10), 2931-2939.
H. Okamura, T. Dohi, S. Osaki (2003) A structural approximation method to generate the optimal auto-sleep schedule for computer systems, Computers and Mathematics with Applications, 46(7), 1103-1110.
H. Okamura, S. Miyahara, T. Dohi (2003) Dependability analysis of a transaction-based multi server system with rejuvenation, IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (A), E86-A(8), 2081-2090.
H. Suzuki, T. Dohi, H. Okamura (2002) Cost-effective analysis of software systems with periodic rejuvenation, IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (A), E85-A(12), 2923-2932.
H. Okamura, S. Miyahara, T. Dohi (2002) Refined non-homogeneous Markovian models for a single-server type of software system with rejuvenation, Revue Francaise d'Automatique, Informatique et Recherche Operationnelle (Recherche Operationnelle/Operations Research), 36(2), 129-148.
T. Dohi, H. Okamura, S. Osaki (2001) Optimal control of preventive maintenance schedule and safety stocks in an unreliable manufacturing environment, International Journal of Production Economics, 74(1-3), 147-155.
H. Okamura, S. Miyahara, T. Dohi, S. Osaki (2001) Performance evaluation of workload-based software rejuvenation scheme, IEICE Transactions on Information and Systems (D), E84-D(10), 1368-1375.
H. Okamura, T. Dohi, S. Osaki (2000) Optimal policies for a controlled queueing system with removable server under a random vacation circumstance, Computers and Mathematics with Applications, 39(1), 215-227.
T. Dohi, H. Okamura, S. Osaki (1999) Optimal order-limit policies for an (r, Q) inventory system, IMA Journal of Mathematics Applied in Business and Industry, 10(2), 127-145.
Last Updated (Wednesday, 23 March 2016 14:35)