| Project/Area Number |
61850059
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
計算機工学
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| Research Institution | Tohoku University |
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Principal Investigator |
NOGUCHI Shoichi Research Institute of Electrical Communication, Tohoku University, Professor, 電気通信研究所, 教授 (80006220)
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| Co-Investigator(Kenkyū-buntansha) |
柿沼 淑彦 郵政省, 電波研究所, 室長
SHIRATORI Norio Research Institute of Electrical Communication, Tohoku University, Associate Pro, 電気通信研究所, 助教授 (60111316)
NEMOTO Yoshiaki Research Institute of Electrical Communication, Tohoku University, Associate Pro, 電気通信研究所, 助教授 (60005527)
SAKATA Masato Computer Center, Tohoku University Associate Professor, 大型計算機センター, 助教授 (60006335)
NAGASAWA Youji Faculty of Engineering, Kagoshima University, Professor, 工学部, 教授 (80005313)
KAKINUMA Yoshihiko Radio Research Laboratory Ministry of Posts and Telecommunications
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| Project Period (FY) |
1986 – 1987
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥28,300,000 (Direct Cost: ¥28,300,000)
Fiscal Year 1987: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1986: ¥25,700,000 (Direct Cost: ¥25,700,000)
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| Keywords | satellite network / distributed protocol / communication software / specification describing language / electric male / 通信衛星 / 電子メール / メッセージ伝送 / リアルタイム処理 / ネットワークプロトコル,通信ソフトウェア / マルチアクセス / メッセージ遅延 |
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| Research Abstract |
The aim of this study is to develope the academic satellite network with small-size earth stations as the prototype of the future academic infomation Networks and is to establish the communication software creating system for the large scale network. The research items and the results obtained here are as follows.
1. Development of the distributed-control-protocol satellite network as the academic information network. (i)Connection with the teristrial LAN It becomes clear that the access method of LAN based on reservation shows the good message transmission characteristic. Flow-control system fitted for this network was investigated. (ii)New protocol of the broadcasting communication for the network with a large number of small earth stations is developed and tested with CS-2 experiments. Experimental resulsts show that this method is quite powerful. (iii)The distributed protocol satellite network is applied to the wide area network, JUNET. The effective connection method is newly developed. The message transmission experiment by using new method shows quite good characteristics. This system is designed to have good portability, so it is quite easy to develope to another system.
2. Development of the communication software automatic-creating system Communication system discussed here is quite large and its function is quite complicated. So it is very important to make the powerful communication software creatring system. Here the design method of the intelligent communication software creating system is investigated. Namely (i)we designed the specification describing language, high level language, editor and algorithm conversion as the basic functions of the system and (ii)also designed the user friendly interface and then (iii) by using these results, we developed the new powerful communiation software creating system.
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