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Overview

Large-Scale Systems Management Lab. research is aimed at developing mathematical modeling and simulation techniques for design, control and architecture of large-scale systems such as large-scale data centers and computer/communication networks, with which the resulting systems achieve high performance, low vulnerability and highly efficient energy saving. Our research focus is on network-science oriented design framework, fundamental technologies and highly-qualified services, in particularly for large-scale computer and/or communication network systems.

News & Topics

31/08/2018 Paper is accepted for publication in Environment and Planning B.

The following paper was accepted for publication in Environment and Planning B.

Fujii, K., Sasabe, M., and Kasahara, S., ``Road Network Risk Analysis Considering People Flow under Ordinal and Evacuation Situations,'' To appear in Environment and Planning B: Urban Analytics and City Science.

20/08/2018 Paper is accepted for publication in IEEE Access.

The following paper was accepted for publication in IEEE Access.

Wan, J., Gui, X., Kasahara, S., Zhang, Y., Wang, L., and Zhang, R., ``Air Flow Measurement and Management for Improving Cooling and Energy Efficiency in Raised-Floor Data Centers: A Survey,'' To appear in IEEE Access.

9/8/2018 Paper is accepted for publication in MDPI Algorithms.

The following paper was accepted for publication in MDPI Algorithms.

Denzumi S., Kawahara J., Tsuda K., Arimura H., Minato S., and Sadakane K., ``DenseZDD: a compact and fast index for families of sets,'' To appear in Algorithms.

07/08/2018 Paper is accepted for publication in IEEE Transactions on Communications.

The following paper was accepted for publication in IEEE Transactions on Communications.

Zhang, Y., Shen, Y., Jiang, X., and Kasahara, S., ``Mode Selection and Spectrum Partition for D2D Inband Communications: A Physical Layer Security Perspective,'' To appear in IEEE Transactions on Communications.

5/8/2018 Paper is accepted for publication in Journal of Graph Algorithms and Applications.

The following paper was accepted for publication in Journal of Graph Algorithms and Applications.

Kawahara J., Saitoh. T, Yoshinaka. R, ``The Time Complexity of Permutation Routing via Matching, Token Swapping and a Variant,'' To appear in Journal of Graph Algorithms and Applications.

11/6/2018 Paper is accepted for publication in IEEE Internet of Things Journal.

The following paper was accepted for publication in IEEE Internet of Things Journal.

Zhang, Y., Kasahara, S., Shen, Y., Jiang, X., and Wan, J., ``Smart Contract-Based Access Control for the Internet of Things,'' To appear in IEEE Internet of Things Journal.

22/5/2018 Paper is accepted for presentation in IEEE Blockchain-2018.

The following paper was accepted for presentation in IEEE Blockchain 2018, as a symposium paper.

Kawase, Y., and Kasahara, S., ``A Batch-Service Queueing System with General Input and Its Application to Analysis of Mining Process for Bitcoin Blockchain,'' To be presented in IEEE Symposium on Recent Advances on Blockchain and Its Applications (BlockchainApp, held in conjunction with the 2018 IEEE International Conference on Blockchain (Blockchain-2018)).

2/5/2018 Paper is accepted for publication in JAIHC.

The following paper was accepted for publication in Journal of Ambient Intelligence and Humanized Computing.

Hara, T., Sasabe, M., and Kasahara, S., ``Geographical Risk Analysis Based Path Selection for Automatic, Speedy, and Reliable Evacuation Guiding Using Evacuees’ Mobile Devices,'' Journal of Ambient Intelligence and Humanized Computing.

27/1/2017 Paper is accepted for publication in JIMO.

The following paper was accepted for publication in Journal of Industrial and Management Optimization.

Kawase, Y., and Kasahara, S., ``Priority Queueing Analysis of Transaction-Confirmation Time for Bitcoin Blockchain,'' To appear in Journal of Industrial and Management Optimization.

27/2/2018 Paper is accepted for publication in IEICE Trans. Fundamental.

The following paper was accepted for publication in IEICE Trans. Fundamental.

Nakahata, Y., Kawahara, J., Horiyama, T., and Kasahara, S., ``Enumerating All Spanning Shortest Path Forests Using Zero-suppressed Binary Decision Diagrams,'' To appear in IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences.

28/1/2018 Paper is accepted for publication in IJOR.

The following paper was accepted for publication in International Journal of Operational Research.

Limpianchob, C., Sasabe, M., and Kasahara, S., ``A push strategy optimization model for a marine shrimp farming supply chain network,'' To appear in International Journal of Operational Research.

1/11/2017 Visiting scholar stays.

Associate prof. Jianxiong Wan at Inner Mongolia University of Technology stays at LSM lab as a visiting scholar until next February.

27/1/2017 Paper is accepted for publication in JIMO.

The following paper was accepted for publication in Journal of Industrial and Management Optimization.

Kasahara, S., and Kawahara, J., ``Effect of Bitcoin Fee on Transaction-Confirmation Process,'' To appear in Journal of Industrial and Management Optimization.

24/10/2017 Paper is accepted for presentation in ITNAC 2017.

The following paper was accepted for presentation in ITNAC 2017.

Nishida, T., Sasabe, M., Kasahara, S., ``Maximizing Communication Opportunity for Collaborative Spectrum Sensing in Cognitive Radio Networks," To be presented in The 27th International Telecommunication Networks and Application Conference.

18/8/2017 Papers are accepted for presentation in international conferences.

The following papers were accepted for presentation in QTNA 2017, MobiWis 2017 and WAAC 2017.

Kawase, Y., and Kasahara, S., ``Transaction-Confirmation Time for Bitcoin: A Queueing Analytical Approach to Blockchain Mechanism,'' To be presented in The 12th International Conference on Queueing Theory and Network Applications (QTNA 2017).

Hara, T., Sasabe, M., and Kasahara, S., ``Short and Reliable Path Selection for Automatic Evacuation Guiding Based on Interactions between Evacuees and Their Mobile Nodes,'' To be presented in The 14th International Conference on Mobile Web and Intelligent Information Systems (MobiWis 2017), Prague, Czech Republic, August 21-23, 2017.

Nakahata, Y., Kawahara, J., Horiyama, T., and Kasahara, S., ``Enumerating All Rooted Shortest Path Forests Using Zero-suppressed Binary Decision Diagrams,'' To be presented in The 20th Korea-Japan Joint Workshop on Algorithms and Computation (WAAC 2017).

05/12/2016 Papars are accepted for presentation in WALCOM2017.

The following papers were accepted for presentation in WALCOM2017.

Kawahara, J., Horiyama, T., Hotta, K., and Minato, S., ``Generating All Patterns of Graph Partitions within a Disparity Bound,'' and

Kawahara J., Saitoh, T., and Yoshinaka, R., ``The Time Complexity of the Token Swapping Problem and Its Parallel Variants,''

to be presented in the 11th International Conference and Workshops on Algorithms and Computation (WALCOM 2017), Hsinchu, Taiwan, 29-31, March, 2017.

24/10/2016 Paper is accepted for presentation in QTNA2016.

The following paper was accepted for presentation in QTNA2016.

Maeda, A., Kasahara, S., and Takahashi, Y., ``Dynamic Task Scheduling for Energy Harvesting Nodes in Wireless Sensor Networks,'' To be presented in The 11th International Conference on Queueing Theory and Network Applications (QTNA2016), Wellington, New Zealand, 13-15 December, 2016.

11/10/2016 Paper is accepted for presentation in IEEE SC2.

The following paper was accepted for presentation in IEEE SC2.

Worachate, A., Kawahara, J., and Kasahara, S., ``Accuracy Improvement for Backup Tasks in Hadoop Speculative Algorithm,'' To be presented in 6th IEEE International Symposium on Cloud and Services Computing (IEEE SC2 2016), Nadi, Fiji, Dec. 7-10, 2016.

24/08/2016 Paper is accepted for publication in GeoInformatica.

The following paper was accepted for publication in GeoInformatica.

Komatsu, N.Sasabe, M.Kawahara, J., and Kasahara, S., ``Automatic Evacuation Guiding Scheme Based on Implicit Interactions Between Evacuees and Their Mobile Nodes,'' GeoInformatica, 2016. (to appear)

22/08/2016 Paper is accepted for presentation in CIIS2016.

The following paper was accepted for presentation in CIIS2016.

Jun Kawahara, Toshiki Saitoh, Hirofumi Suzuki, and Ryo Yoshinaka, "Solving the longest oneway-ticket problem and enumerating letter graphs by augmenting the two representative approaches with ZDDs," CIIS2016. (to appear)

2-3/8/2016 We made a trip to Shiga Pref.

Almost all the members of LSM lab made a trip to Shiga Pref. (photo)

30/5/2016 Paper is accepted for presentation in MobiWis2016.

Our paper was accepted for presentation in MobiWis2016.

Komatsu, N., Sasabe, M., and Kasahara, S., ``On Information Sharing Scheme for Automatic Evacuation Guiding System Using Evacuees' Mobile Nodes,'' The 13th International Conference on Mobile Web and Intelligent Information Systems (MobiWis 2016).

11/5/2016 Paper is accepted for presentation in APCC2016.

Our paper was accepted for presentation in APCC2016.

Tuchin, A. E., Sasabe, M., and Kasahara, S., ``A Simple Algorithm of Centralized Flow Management for Data Centers,'' To be presented in The 22nd Asia-Pacific Conference on Communications (APCC 2016).

24/08/2016 Paper is accepted for publication in JORSJ.

The following paper was accepted for publication in Journal of Operations Society of Japan.

Hirai, T., Masuyama, H., Kasahara, S., and Takahashi, Y., ``Performance Analysis of Task Replication in Large-Scale Parallel-Distributed Processing: An Extreme Value Theory Approach,'' Journal of the Operations Research Society of Japan, vol. 59, no. 2, pp. 174-194, April 2016.

11/7/2016 Ending ceremony of the internship program took place.

The ending ceremony of the internship program took place at our lab. (photo)

23/5/2016 An internship-program student has come to LSM lab.

An internship-program student from Chulalongkorn University (Thailand) is staying at our lab. (until 11/7/2016).

15/4/2016 New Master-Course students joined LSM lab.

Eight Master-course students joined LSM lab.

4/4/2016 Paper on Bitcoin is published.

We have published a paper on the analysis of Bitcoin transactions.

Kasahara, S., Kawahara, J., "Priority Mechanism of Bitcoin and Its Effect on Transaction-Confirmation Process," arXiv:1604.00103, 2016.

24/3/2016 Master-Course students graduated from LSM lab.

Eight Master-course students graduated from LSM lab.

31/5/2015 Paper is accepted for presentation in MobiWis2015.

Our paper was accepted for presentation in MobiWis2015.

Komatsu, N., Sasabe, M., Kawahara, J., and Kasahara, S., ``Automatic Evacuation Guiding Scheme Using Trajectories of Mobile Nodes,'' To be presented in the 12th International Conference on Mobile Web and Intelligent Information Systems (MobiWis2015), Roma, Italy, 24-26, August, 2015.

21/5/2015 Paper is accepted for presentation in QTNA2015.

Our paper on performance evaluation of energy management for data centers was accepted for presentation in QTNA2015. (Hanoi, Vietnam, 17-20, August, 2015)

Sakata, T., and Kasahara, S., ``Multi-server Queue with Job Service Time Depending on a Background Process'' 

14/4/2015 New Master-Course students joined LSM lab.

Master-course students joined LSM lab.

1/10/2014 New Master-Course student joined LSM lab.

A master-course student joined LSM lab.

18/7/2014 Our proposal accepted in a research fund.

Our proposal was accepted into a research fund of Ministry of Internal Affairs and Communications in Japan.

19/6/2014 Internship students stay at LSM lab.

Two students from Chulalongkorn University and a student from Kasetsart University at Thailand join in our internship program.

17/4/2014   New Master-Course students joined LSM lab.

Eight master-course students joined LSM lab.

1/4/2014   Dr. Masahiro Sasabe joined LSM lab.

Dr. Masahiro Sasabe joined LSM lab. on April 1, 2014, as an associate professor.

15/6/2013   Paper accepted in QTNA 2013.

Our paper on the effect of deadline time on the performance of backup-task scheduling for cloud computing was accepted in QTNA 2013. (June 15, 2013)
Hashimoto et al., ``Effect of Deadline Time on Job Completion Time for Backup-Task Scheduling in Cloud Computing''

23/5/2013   Paper accepted in SIROCCO 2013.

Our paper on a buffer management for frame throughput maximization was accepted in SIROCCO 2013. (May 23, 2013)
Kawahara and Kobayashi, ``Optimal Buffer Management for 2-Frame Throughput Maximization''

2013/6/23   Paper accepted in Journal of the Operations Research Society of Japan.

Our paper on new performance measures for streaming services over wired-wireless networks was accepted for publication in Journal of the Operations Research Society of Japan. (Jan. 23, 2013)
Kato et al., ``Block-Level Success and Loss Runs for Streaming Services over Wired-Wireless Networks''