1994 Fiscal Year Final Research Report Summary
Development of Hypertext CAI system for Distributed System
| Project/Area Number |
04559013
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
広領域
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| Research Institution | Nara National College of Technology |
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Principal Investigator |
NAKANISHI Yoshiro Nara National College of Technology, Emeritus Professor, 名誉教授 (00028961)
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| Co-Investigator(Kenkyū-buntansha) |
SHIMOJO Shinji Osaka University, Computation Center, Associate Professor, 大型計算機センター, 助教授 (00187478)
NAKANO Hideo Osaka University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (40093439)
YAMAI Nariyoshi Osaka University, Education Center for Information Processing, Research Associat, 情報処理教育センター, 助手 (90210319)
KUDOH Hideo Nara Department of Information Engineering, Associate Professor, 情報工学科, 助教授 (60133146)
SUZUKI Chuji Nara National College of Technology, Department of Information Engineering, Prof, 情報工学科, 教授 (40216411)
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| Project Period (FY) |
1992 – 1994
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| Keywords | Hypertext / Network / Multicast / UNIX / Multiuser / Load Balancing / Distributed Processing / CAI system |
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| Research Abstract |
On this research project, we have designed and implemented several functions to support class lesson or group studying, such as presentation of teacher's screen and reference of studnet's screen.
Summary of our research results is as follows :
1. We introduced an extended link and an extended node into the traditional hypertext model to represent new functions of our system. According to this model, we develpoed communication facilities.
2. We developed file server for fast access to teaching documents by introducing WWFS and CERN httpd. This file server keeps the track of the locations of documents, and if several copys of the same documents exist, it accesses the nearest one.
3. We developed remote procedure call mechanism on the system to provide various functions as external programs. We also developed some external functions such as real-time communication function and video equipment control function.
4. We developed load balancing mechanism on remote procedure call for efficient use of the system even when congestion of the server.
As the result of test use on the distributed system with two computers and two terminals, new functions were available on the prototype system.
But the effect of load balancing could not be confirmed because the prototype system was too small.
Further work of this research project is multimedia support such as teaching document with video and voice, and real-time presentatin/reference of screen.
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