Sumita Ushio

Ushio Sumita

Information about the author Ushio Sumita will soon be added to the site.
Found 20 papers in total
Correlated multivariate shock models associated with a renewal sequence and its application to analysis of browsing behavior of internet users
Correlated multivariate shock models associated with a renewal sequence and its application to analysis of browsing behavior of internet users
2010
A correlated multivariate shock model is considered where a system is subject to a...
Danger of exclusive reliance on ergodic analysis for a class of preventive maintenance policies
Danger of exclusive reliance on ergodic analysis for a class of preventive maintenance policies
2010
In the literature, the study of preventive maintenance policies has been largely...
Dynamic analysis of a reward process defined on a cyclic renewal process with applications to preventive maintenance problems
Dynamic analysis of a reward process defined on a cyclic renewal process with applications to preventive maintenance problems
2009
A cyclic renewal process is considered as an extension of an alternating renewal...
Numerical exploration of dynamic behavior of Ornstein–Uhlenbeck processes via Ehrenfest process approximation
Numerical exploration of dynamic behavior of Ornstein–Uhlenbeck processes via Ehrenfest process approximation
2006
Recently Ornstein–Uhlenbeck (O–U) processes have been drawing much...
Stochastic analysis of number of corporations in a market derived from strategic policies of individual corporations for market entry and retreat
Stochastic analysis of number of corporations in a market derived from strategic policies of individual corporations for market entry and retreat
2006
A stochastic model is developed for describing a market lifecycle expressed in terms...
Optimal internal pricing and capacity planning for service facility with finite buffer
Optimal internal pricing and capacity planning for service facility with finite buffer
2001
An economic model is developed for exploring optimal internal pricing and capacity...
On a generalized M/G/1 queue with service degradation/enforcement
On a generalized M/G/1 queue with service degradation/enforcement
1998
A generalized M/G/1 queuing system is considered where the efficiency of the server...
Optimal repair of degrading computers under asymmetric information and incentive incompatibility
Optimal repair of degrading computers under asymmetric information and incentive incompatibility
1998
This paper presents the optimal repair policy of a firm's computer system in the...
Optimal allocation and backup of computer resources under asymmetric information and incentive incompatibility
Optimal allocation and backup of computer resources under asymmetric information and incentive incompatibility
1996
This paper presents the optimal allocation and backup of computing resources in a...
Necessary and sufficient conditions for global geometric convergence of block Gauss–Seidel iteration algorithm applied to Markov chains
Necessary and sufficient conditions for global geometric convergence of block Gauss–Seidel iteration algorithm applied to Markov chains
1997
Convergence properties of the block Gauss–Seidel algorithm applied to ergodic...
A closed queueing network model to evaluate the impact of recovery operations on the performance of database servers
A closed queueing network model to evaluate the impact of recovery operations on the performance of database servers
1996
As database servers proliferate in modern information systems architectures in...
Analysis of multivariate Markov modulated Poisson processes
Analysis of multivariate Markov modulated Poisson processes
1992
A multivariate Markov modulated Poisson process M (t)=[M 1 (t),...,N K (t)] governed...
Structural properties of optimal tool replacement policy in a machining center
Structural properties of optimal tool replacement policy in a machining center
1992
An optimal tool replacement problem for a machining center in a flexible manufacturing...
Theory and algorithms of the Laguerre transform, Part II: Algorithm
Theory and algorithms of the Laguerre transform, Part II: Algorithm
1991
The Laguerre transform developed by Keilson, Nunn and Sumita provides an algorithmic...
Numerical analysis of gracefully degrading fault-tolerant computer systems: Semi-Markov and Laguerre transform approach
Numerical analysis of gracefully degrading fault-tolerant computer systems: Semi-Markov and Laguerre transform approach
1991
A gracefully degrading fault-tolerant computer system is considered where the system...
Renewal characterization of Markov Modulated Poisson Processes
Renewal characterization of Markov Modulated Poisson Processes
1989
A Markov Modulated Poisson Process (MMPP) M(t) defined on a Markov chain J(t) is a...
The Laguerre transform of product of functions
The Laguerre transform of product of functions
1989
The Laguerre transform developed by Keilson, Nunn and Sumita provides an algorithmic...
First passage times and lumpability of semi-Markov processes
First passage times and lumpability of semi-Markov processes
1988
A necessary and sufficient condition of Serfozo for lumpability of semi-Markov...
Lumpability and time reversibility in the aggregation-disaggregation method for large Markov chains
Lumpability and time reversibility in the aggregation-disaggregation method for large Markov chains
1989
The aggregation-disaggregation algorithm of Takahashi is a rank-reduction method for...
Theory and algorithms of the Laguerre transform, Part I: Theory
Theory and algorithms of the Laguerre transform, Part I: Theory
1988
The Laguerre transform, introduced by Keilson and Nunn and Sumita, provides an...
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