| Project/Area Number |
08308025
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
社会システム工学
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| Research Institution | TOKYO INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
TAKAHASHI Yukio Tokyo Institute of Technology, Graduate School of Information Science and Engineering, Professor, 大学院・情報理工学研究科, 教授 (70016153)
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| Co-Investigator(Kenkyū-buntansha) |
MAKIMOTO Naoki University of Tsukuba, Institute of Policy and Planning Sciences, Associate Prof, 社会工学系, 助教授 (90242263)
TAKINE Tetsuya Kyoto University, Graduate School of Information Sciences, Associate Professor, 大学院・情報学研究科, 助教授 (00216821)
TAKAHASHI Yoshitaka NTT,Multimedia Network Labs.Chief Scientist, 主幹研究員
MIYAZAWA Masakiyo Science University of Tokyo, Faculty of Science and Engineering, Professor, 理工学部, 教授 (80110948)
OHNO Katsuhisa Nagoya Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (50026118)
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| Project Period (FY) |
1996 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥9,600,000 (Direct Cost: ¥9,600,000)
Fiscal Year 1998: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1997: ¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 1996: ¥3,600,000 (Direct Cost: ¥3,600,000)
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| Keywords | Communication networks / Performance models / Queueing networks / Input processes with correlations / Long-range dependence / Large deviation theory / ATM networks / Flow control |
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| Research Abstract |
Fourteen members worked on the study of new methods for performance evaluation to communication networks. We had monthly meetings and annual seminars to which more than a hundred people attained.
We forcused on the following four topics :
1. Study of input processes : We mainly worked on long-range dependence and on multiple-input queues. A remarkable result is the following : If we concerned only loss probabilities, the behavior of the input process in the peak period is most important and we need not concern about whether the input process is long-range-dependent or not.
2. Study on extreme situation : We mainly studied geometric decay property of the tail of the customer distribution. Using the matrix-geometric approach or the large-deviation theory, we proved the tail decays geometrically in many cases.
3. Study on propagation of congestion : This problem was vary hard and we obtained almost no result about the phenomena.
4. Study on control of networks : We analyzed various networks and made a number of proposals on the network configurations and controls. These results will be published in journals near future. We started studies on mobile communication systems and on control by the fee. These mold become important topics in the study of communication networks.
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