The Laguerre Transform and a Family of Functions with Nonnegative Laguerre Coefficients. - Ushio Sumita (Math. Oper. Res., 1984)

Analysis of Software Availability/Reliability Under the Influence of Hardware Failures. - Ushio Sumita; Yasushi Masuda (IEEE Trans. Software Eng., 1986)

Ent-to-end delay of a database transfer over unreliable communication network. - Ushio Sumita; Peter Kubat (ICCC, 1988)

Analysis of Query Processing in Distributed Database Systems with Fully Replicated Files: A Hierarchical Approach. - Ushio Sumita; Olivia R. Liu Sheng (Perform. Evaluation, 1988)

Analysis of Channel and Disk Subsystems in Computer Systems. - Bezalel Gavish; Ushio Sumita (Queueing Syst. Theory Appl., 1988)

Analysis of Effective Service Time with Age Dependent Interruptions and Its Application to Optimal Rollback Policy for Database Management. - Ushio Sumita; Naoto Kaio; Paulo B. Góes (Queueing Syst. Theory Appl., 1989)

Replacement process decomposition for discounted Markov renewal programming. - Paul J. Schweitzer; Ushio Sumita; Katsuhisa Ohno (Ann. Oper. Res., 1991)

Numerical analysis of gracefully degrading fault-tolerant computer systems: Semi-markov and laguerre transform approach. - Yasushi Masuda; Ushio Sumita (Comput. Oper. Res., 1991)

Structural properties of optimal tool replacement policy in a machining center. - Qiu-Sheng Liu; Katsuhisa Ohno; Ushio Sumita (Oper. Res. Lett., 1992)

Analysis of multivariate Markov modulated Poisson processes. - Ushio Sumita; Yasushi Masuda (Oper. Res. Lett., 1992)

Analysis of a new thruway communication system with discrete minimal zones. - Paulo B. Góes; Hironao Kawashima; Ushio Sumita (IEEE Trans. Commun., 1992)

Stochastic Models for Performance Analysis of Database Recovery Control. - Paulo B. Góes; Ushio Sumita (IEEE Trans. Computers, 1995)

Optimal repair of degrading computers under asymmetric information and incentive incompatibility. - K. Cheng Hsing; Marshall L. Freimer; William B. Richmond; Ushio Sumita (Comput. Oper. Res., 1998)

Optimal internal pricing and capacity planning for service facility with finite buffer. - Ushio Sumita; Yasushi Masuda; Shigetaka Yamakawa (Eur. J. Oper. Res., 2001)

Optimal threshold analysis of segmentation methods for identifying target customers. - Makoto Mizuno; Akira Saji; Ushio Sumita; Hideo Suzuki (Eur. J. Oper. Res., 2008)

Dynamic Analysis of a Unified Multivariate Counting Process and Its Asymptotic Behavior. - Ushio Sumita; Jia-Ping Huang (Int. J. Math. Math. Sci., 2009)

Enhancement of e-commerce via mobile accesses to the Internet. - Ushio Sumita; Jun Yoshii (Electron. Commer. Res. Appl., 2010)

The impact of mobile access to the internet on information search completion time and customer conversion. - Ushio Sumita; Jinshui Zuo (Electron. Commer. Res. Appl., 2010)

Credit risk model with contagious default dependencies affected by macro-economic condition. - Hideyuki Takada; Ushio Sumita (Eur. J. Oper. Res., 2011)

Development of Sequential Association Rules for Preventing Minor-stoppages in Semi-conductor Manufacturing. - Sumika Arima; Ushio Sumita; Jun Yoshii (ICORES, 2012)

How to Equip Students with Methodologies and Tools for Capturing Rapidly Changing Environments through Computer Supported Education. - Ushio Sumita; Jun Yoshii (CSEDU, 2013)

Development of computational algorithms for pricing European bond options under the influence of macro-economic conditions. - Jia-Ping Huang; Ushio Sumita (Appl. Math. Comput., 2015)

Development of Recommendation Engines for Enhancing Sales of DIY (Do It Yourself) Stores. - Xinlong Hu; Shan Yu; Masaki Shobu; Ushio Sumita (IIAI-AAI, 2016)

Development of Segmentation Algorithm for Identifying VOCs (Voice of Customers) with Sales Potential and Those with Negative Attitude at Call Centers. - Ryohei Kubota; Xinlong Hu; Masaki Shobu; Ushio Sumita (IIAI-AAI, 2016)

Development and Analysis of Markov Chain Model for Optimally Allocating Operators at Call Centers. - Shan Yu; Ryohei Kubota; Masaki Shobu; Ushio Sumita (IIAI-AAI, 2016)

A New Approach for Developing Segmentation Algorithms for Strongly Imbalanced Data. - Kazuki Fujiwara; Maiko Shigeno; Ushio Sumita (IEEE Access, 2019)