2006 Fiscal Year Final Research Report Summary
Studies on Broadcast-base Cyberspace for Realizing a Large-scale Virtual Space
| Project/Area Number |
15300033
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Media informatics/Database
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| Research Institution | Osaka University |
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Principal Investigator |
OGAWA Takefumi Osaka University, Cybermedia Center, Assistant Professor, サイバーメディアセンター, 助手 (60324860)
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| Co-Investigator(Kenkyū-buntansha) |
TSUKAMOTO Masahiko Kobe University, Faculty of Engineering, Professor, 工学部, 教授 (60273588)
TERADA Tsutomu Osaka University, Cybermedia Center, Lecturer, サイバーメディアセンター, 講師 (70324861)
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| Project Period (FY) |
2003 – 2006
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| Keywords | virtual space / broadcast / scheduling strategy / avatar / caching strategy |
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| Research Abstract |
In large-scale networked virtual environments, excessive load on the server occurs due to an increase of clients. In order to reduce the server load, we proposed a broadcast-based cyberspace.
First, we assumed an environment where a large volume of model data composed of virtual space is broadcasted as data items. In the proposed system, a server divides virtual space into multiple subspaces and repeatedly broadcasts spatial data of the subspaces to clients using a broadband channel. We investigate two scheduling strategies of the broadcast program in order to reduce the average waiting time for the avatar of a user to migrate to an adjacent subspace considering the broadcast bandwidth between a server and clients and movement speed of the user in virtual space. Moreover, we also proposed prefetching methods at clients.
Next, we assumed an environment where the real-time information on positions and properties of objects is broadcasted as data items and propose a scheduling strategy for improving broadcast efficiency. Our scheduling strategy considers the object popularity, distance between objects and avatars which observes the object, and the broadcast period. We confirmed the results of simulation experiments regarding the performance of our proposed method.
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[Journal Article] A Query Processing Method Based on Query Frequency in Broadcast Database Systems2006
Author(s)
Kitajima, S., Cai, J., Terada, T., Hara, T., Nishio, S.
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Journal Title
IPSJ SIG Technical Reports Vol.2006, No.9
Pages: 175-182
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] A Rule-Based RFID Tag System Using Ubiquitous Chips2005
Author(s)
Yoshihisa, T., Kishino, Y., Terada, T., Tsukamoto, M., Sagara, R., Sukenari, T., Taguchi, D., Nishio, S.
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Journal Title
Proc. of Int'1 Conf. on Active Media Technology (AMT 2005)
Pages: 423-428
Description
「研究成果報告書概要(和文)」より
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[Journal Article] A Rule-Based RFID Tag System Using Ubiquitous Chips2005
Author(s)
Yoshihisa, T., Kishino, Y., Terada, T., Tsukamoto, M., Sagara, R., Sukenari, T., Taguchi, D., Nishio, S.
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Journal Title
Proc.of Int'l Conf.on Active Media Technology (AMT 2005)
Pages: 423-428
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] A Query Processing Method for Mobile Clients in Database Broadcasting Systems2005
Author(s)
Kitajima, S., Cai, J., Terada, T., Hara, T., Nishio, S.
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Journal Title
IPSJ SIG Technical Reports Vol.2005, No.6
Pages: 1-8
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] The Design and Implementation of Migration Method of Mobile Agents on Ja-Net on Grid for Increasing Reliability of Host Utilization2005
Author(s)
Numata, S., Itao, T., Ogawa, T., Tsukamoto, M., Nishio, S.
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Journal Title
IPSJ SIG Technical Reports Vol.2005, No.6
Pages: 47-54
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] An Image-based Approach for Human Communication on the WWW2005
Author(s)
Ogawa, T., Tsukamoto, M., Nishio, S.
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Journal Title
Communication and Collaboration Support Systems (Ed. Okada, K, Hoshi, T., and Inoue, T.) Ohmsha/IOS Press
Pages: 281-297
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] An Event-Driven Wearable System for Supporting Motorbike Racing Teams2004
Author(s)
Miyamae, M., Terada, T., Tsukamoto, M., Hiraoka, K., Fukuda, T., Nishio, S.
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Journal Title
Proc. of IEEE Int'1 Symposium on Wearable Computers (ISWC 2004)
Pages: 180-181
Description
「研究成果報告書概要(和文)」より
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[Journal Article] An Information Filtering System that Optimizes the Processing Method Based on Mathematical Properties2004
Author(s)
Kodera, T., Sawai, R., Terada, T., Tsukamoto, M., Nishio, S.
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Journal Title
Proc. of IASTED Int'1 Conf. on Communications, Internet, and Information Technology (CIIT 2004)
Pages: 274-279
Description
「研究成果報告書概要(和文)」より
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[Journal Article] An Event-Driven Wearable System for Supporting Motorbike Racing Teams2004
Author(s)
Miyamae, M., Terada, T., Tsukamoto, M., Hiraoka, K., Fukuda, T., Nishio, S.
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Journal Title
Proc.of IEEE Int'l Symposium on Wearable Computers (ISWC 2004)
Pages: 180-181
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] An Information Filtering System that Optimizes the Processing Method Based on Mathematical Properties2004
Author(s)
Kodera, T., Sawai, R., Terada, T., Tsukamoto, M., Nishio, S.
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Journal Title
Proc.of IASTED Int'l Conf.on Communications, Internet, and Information Technology (CIIT 2004)
Pages: 274-279
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] A P2P Data Sharing System using E-mail for Wearable Computing Environments2004
Author(s)
Miura, N., Miyamae, M., Terada, T., Tsukamoto, Nishio, S.
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Journal Title
Proc.of Symposium on Multimedia, Distributed, Cooperative and Mobile Systems (DICOMO2004) Vol.2004, No.7
Pages: 489-492
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] A Processing Method Converting Mechanism Considering Waiting Data for an Information Filtering System2004
Author(s)
Kodera, T., Sawai, R., Terada, T., Tsukamoto, M., Nishio, S.
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Journal Title
Proc.of Symposium on Multimedia, Distributed, Cooperative and Mobile Systems (DICOMO2004) Vol.2004, No.7
Pages: 539-542
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] An Information Filtering System with an Optimization Mechanism of the Processing Method Based on Mathematical Properties2003
Author(s)
Kodera, T., Sawai, R., Terada, T., Tsukamoto, M., Nishio, S.
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Journal Title
IPSJ SIG Technical Reports Vol.2003, No.71
Pages: 459-466
Description
「研究成果報告書概要(欧文)」より
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[Book] Communication and Collaboration Support Systems (Ed. Okada, K., Hoshi, T., and Inoue, T.)2005
Author(s)
Ogawa, T., Tsukamoto, M., Nishio, S.
Total Pages
303
Publisher
Ohmsha/IOS Press
Description
「研究成果報告書概要(和文)」より
