Updated on 2025/10/29

写真a

 
SASABE,Masahiro
 
Organization
Faculty of Informatics Professor
Title
Professor
External link

Degree

  • Ph.D. (Information Science) ( 2006.3   Osaka University )

Research Interests

  • Advanced Information Networking

  • Network Optimization

  • Human-Harmonized Systems

  • Network Functions Virtualization

  • Mathematical Optimization

  • Selfish yet Optimal Control

  • Game Theory

  • Content Delivery

  • Automatic Evacuation Guiding

Research Areas

  • Informatics / Computer system

  • Informatics / Information network

Education

  • The University of Osaka   Graduate School of Information Science and Technology   Department of Information Networking

    2003.4 - 2004.6

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    Country: Japan

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  • The University of Osaka   Graduate School of Engineering Science   Department of Informatics and Mathematical Science Division of Computer Science

    2001.4 - 2003.3

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    Country: Japan

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  • The University of Osaka   School of Engineering Science   Department of Information and Computer Sciences

    1997.4 - 2001.3

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    Country: Japan

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Research History

  • Kansai University   Faculty of Informatics   Professor

    2023.4

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  • Nara Institute of Science and Technology   Graduate School of Science and Technology   Associate Professor

    2018.4 - 2023.3

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  • Nara Institute of Science and Technology   Graduate School of Information Science   Associate Professor

    2014.4 - 2018.3

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  • Osaka University   Graduate School of Engineering   Assistant Professor

    2007.7 - 2014.3

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  • Osaka University   Cybermedia Center   Assistant Professor

    2007.4 - 2007.6

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    Country:Japan

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  • Osaka University   Cybermedia Center   Assistant Professor

    2004.7 - 2007.3

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  • Japan Society for the Promotion of Science   Research Fellowship for Young Scientists

    2003.9 - 2004.6

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Professional Memberships

Papers

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MISC

  • eBPF/XDP/AF_XDP を活用したネットワーク内推論

    原 崇徳, 笹部 昌弘

    電子情報通信学会技術研究報告(コミュニケーションクオリティ研究会)   124 ( 90 )   54 - 55   2024.6

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  • サービスチェイニングのためのeBPFを利用したOrdered Proof of Transitの検討

    原 崇徳, 笹部 昌弘

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   124 ( 14 )   23 - 28   2024.5

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  • 機械学習を搭載したカーネル空間・ユーザ空間パケット処理の性能分析

    原 崇徳, 笹部 昌弘

    電子情報通信学会技術研究報告(RISING)   1 - 1   2023.10

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  • ニューラルネットワークを搭載したAF_XDPによるパケット処理性能の分析

    原 崇徳, 笹部 昌弘

    電子情報通信学会ソサイエティ大会講演論文集   B-6-27   1 - 1   2023.9

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  • ニューラルネットワークを搭載したextended Berkeley Packet Filterを用いたカーネルネットワーキングの一検討

    原 崇徳, 笹部 昌弘

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   123 ( 17 )   26 - 31   2023.5

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  • NFVネットワークにおける複数ブローカ間での競争的サービスチェイニング

    小倉 亮平, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   122 ( 406 )   31 - 36   2023.3

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  • VNFの多様性・冗長性に基づく可用性と資源効率を考慮したサービスチェイニングとVNF配置方式

    杉原 健斗, 原 崇徳, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   122 ( 406 )   1 - 6   2023.3

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  • NFVネットワークにおける複数ブローカ間での競争的サービスチェイニング方式に関する検討

    小倉 亮平, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(RISING)   2022.10

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  • NFVネットワークにおけるサービスパス遅延最小化のための利己的サービスチェイニング

    小倉 亮平, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   122 ( 198 )   88 - 93   2022.10

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  • 容量制約付き最短経路ツアー問題に基づくサービスチェイニング ~ グラフニューラルネットワークを用いた深層強化学習に基づく解法 ~

    原 崇徳, 笹部 昌弘

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   122 ( 5 )   7 - 12   2022.4

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  • ネットワークスライシングにおける低コスト・低遅延なサービスパスの実現

    田中 誠也, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   121 ( 433 )   19 - 24   2022.3

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  • 容量制約付き最短経路ツアー問題に基づくサービスチェイニング ~ 整数線形計画とラグランジュ緩和による解法 ~

    原 崇徳, 笹部 昌弘

    電子情報通信学会技術研究報告(RISING)   2021.11

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  • 容量制約付き最短経路ツアーとラグランジュ緩和を用いたNFVネットワークにおけるオンラインサービスチェイニング

    原 崇徳, 笹部 昌弘

    日本学術振興会産学協力研究委員会インターネット技術第 163 委員会meet50   2021.11

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  • 容量制約付き最短経路ツアー問題に基づくサービスチェイニング ~ ラグランジュ緩和法と最短経路ツアーアルゴリズムに基づく解法 ~

    原 崇徳, 笹部 昌弘

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   121 ( 170 )   18 - 23   2021.9

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  • Reputation-Based Reward Distribution Mechanism for Blockchain-Based Scientific Paper Publishing Systems

    Yoshiro Minamoto, Yuanyu Zhang, Masahiro Sasabe, Shoji Kasahara

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   120 ( 413 )   287 - 292   2021.3

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  • 2クラスTit-for-Tat型P2Pファイル配信における最小配信時間の解析

    清光 将生, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   120 ( 413 )   143 - 148   2021.3

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  • 高可用性・省電力性・冗長性を備えたNFVネットワーク実現のためのサービスチェイニング

    馬場 柾也, 原 崇徳, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   120 ( 413 )   43 - 48   2021.3

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  • 大規模災害時に真に利用可能な避難支援システムの実現に向けて

    笹部 昌弘

    電子情報通信学会総合大会講演論文集   BI-6-3   45 - 46   2021.3

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  • 距離制約付き迂回可能性を含む経路の到達可能性に関する検討

    大谷 珠有, 原 崇徳, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(コミュニケーションクオリティ研究会)   120 ( 258 )   10 - 15   2020.11

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  • Proof-of-Stake型ブロック・チェーンの参加ノードへのインセンティブづけに関する一検討

    松永 赳尭, 張 元玉, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   120 ( 257 )   62 - 67   2020.11

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  • 距離制約付き迂回路を含む経路の到達可能性に関する一検討

    大谷 珠有, 原 崇徳, 笹部 昌弘, 笠原 正治

    電子情報通信学会ソサイエティ大会講演論文集   B-11-16   1 - 1   2020.9

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  • IOTAに基づいたIoTアクセス制御方式の設計と実装

    中西 瑠海, 張 元玉, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   119 ( 460 )   295 - 300   2020.3

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  • ビットコインネットワークにおけるブロック拡散妨害攻撃への対抗策 ~ 推定ダウンロード速度に基づくブロック取得先選択 ~

    山本 将成, 笹部 昌弘, 張 元玉, 笠原 正治

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   119 ( 460 )   83 - 88   2020.3

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  • Block Withholding Attackが存在する場合のマイニングプール選択問題

    藤田 健太郎, 張 元玉, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   119 ( 460 )   71 - 76   2020.3

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  • Tit-for-Tat型P2P ファイル配信における線形計画法に基づく最小配信時間の分析

    西 洋平, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   119 ( 460 )   141 - 146   2020.3

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  • Ethereumブロックチェーンを用いたIoT向け分散型属性ベース・アクセス制御方式のコスト評価

    豊 美玲, 張 元玉, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   119 ( 460 )   77 - 82   2020.3

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  • 地理リスク情報を考慮した自動避難誘導アプリケーションの設計・実装

    原 崇徳, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(コミュニケーションクオリティ研究会)   119 ( 367 )   35 - 40   2020.1

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  • 道路網におけるトラヒック情報制御による利己的最適ルーティング

    原 崇徳, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(RISING)   2019.11

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  • ビットコインネットワークにおけるブロック拡散妨害攻撃のリスク評価

    山本 将成, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(コミュニケーションクオリティ研究会)   119 ( 298 )   1 - 6   2019.11

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  • Bitcoinネットワークにおけるブロック拡散妨害の感染症伝播モデルに着想を得た数理モデル化

    笹部 昌弘

    電子情報通信学会技術研究報告(RISING)   2019.11

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  • Bitcoinネットワークにおけるブロック拡散妨害の数理モデル化

    笹部 昌弘

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   119 ( 221 )   75 - 75   2019.10

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  • Bitcoinネットワーク上でのブロック拡散遅延攻撃における攻撃者数の影響

    山本 将成, 笹部 昌弘, 笠原 正治

    電子情報通信学会ソサイエティ大会講演論文集   B-11-10   166 - 166   2019.9

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  • IoTに向けたEthereumブロックチェーンを用いたCapability-Based Access Controlの実装 ~ アクションレベルでのCapabilityの構築 ~

    中村 優太, 張 元玉, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   118 ( 465 )   349 - 354   2019.3

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  • Bitcoinネットワークにおけるブロック拡散妨害に関する一検討

    笹部 昌弘

    電子情報通信学会総合大会講演論文集   B-11-14   1 - 1   2019.3

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  • Tit-for-Tat型P2Pファイル配信におけるピア間の近傍性を考慮したピースの等価交換の緩和に関する検討

    西 洋平, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   118 ( 465 )   231 - 236   2019.3

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  • IoTのための柔軟な分散型属性ベース・アクセス制御の実現 ~ Ethereumブロックチェーンベースのフレームワーク ~

    豊 美玲, 張 元玉, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   118 ( 465 )   343 - 348   2019.3

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  • モバイル・エッジ連携型自動避難誘導における迅速性・安全性・避難所容量を考慮した避難所選択方式

    松田 大樹, 原 崇徳, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(コミュニケーションクオリティ研究会)   118 ( 395 )   59 - 64   2019.1

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  • [奨励講演] 道路網におけるユーザの利己性を考慮した最適ルーティングのためのトラヒック情報制御方式

    原 崇徳, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   118 ( 371 )   23 - 28   2018.12

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  • 利己的ルーティングにおけるユーザの行動変容

    原 崇徳, 笹部 昌弘, 笠原 正治

    基盤(S) 離散構造処理系プロジェクト「短期滞在セミナー週間 (SSSW)2018.09A」   2018.9

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  • 整数線形計画問題によるTit-for-Tat型P2Pコンテンツ配信の最適性分析

    笹部 昌弘

    基盤(S) 離散構造処理系プロジェクト「短期滞在セミナー週間 (SSSW)2018.09A」   2018.9

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  • モバイル・エッジ連携型自動避難誘導における迅速性・安全性・避難所容量を考慮した避難所選択方式に関する一検討

    松田 大樹, 原 崇徳, 笹部 昌弘, 笠原 正治

    電子情報通信学会ソサイエティ大会講演論文集   B-11-12   1 - 1   2018.9

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  • 道路網におけるユーザの寛容性と情報共有が分散型経路選択方式に与える影響

    原 崇徳, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   118 ( 38 )   63 - 68   2018.5

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  • 道路網におけるユーザの利己的行動と情報共有が分散型経路選択方式に与える影響

    原 崇徳, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(コミュニケーションクオリティ研究会)   118 ( 8 )   59 - 64   2018.4

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  • 道路網における情報共有とユーザの利己的行動が分散型経路選択方式に与える影響に関する一検討

    原 崇徳, 笹部 昌弘, 笠原 正治

    電子情報通信学会総合大会講演論文集   B-11-9   1 - 1   2018.3

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  • Tit-for-Tat型P2Pファイル配信におけるピアのchurnが平均ファイル取得時間に与える影響

    香山 侑槻, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   117 ( 459 )   79 - 84   2018.3

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  • 道路網におけるユーザの利己的行動と通信環境が分散型経路選択方式に与える影響

    原 崇徳, 笹部 昌弘, 笠原 正治

    電子情報通信学会技術研究報告(第5回コミュニケーションクオリティ(CQ)基礎講座ワークショップ)   2018.1

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  • コグニティブ無線における協調センシングのためのインセンティブ設計に関する一検討

    西田 知弘, 笹部 昌弘, 笠原 正治

    日本学術振興会産学協力研究委員会インターネット技術第 163 委員会meet42   2017.11

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  • On collaborative spectrum sensing mechanism based on system load and detection performance in cognitive radio networks

    117 ( 204 )   61 - 66   2017.9

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  • 避難者・モバイル端末間連携型自動避難誘導における経路長と経路信頼性を考慮した避難経路選択方式に関する一検討

    原 崇徳, 笹部 昌弘, 笠原 正治

    日本学術振興会産学協力研究委員会インターネット技術第 163 委員会meet41   2017.5

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  • 通行不能箇所情報の共有による孤立領域検出方式に関する一検討

    藤井 公大, 笹部 昌弘, 笠原 正治

    電子情報通信学会総合大会講演論文集   B-11-28   1 - 1   2017.3

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  • On Path Selection Considering Length and Reliability for Automatic Evacuation Guiding Based on Interactions between Evacuees and Their Mobile Nodes

    116 ( 484 )   517 - 522   2017.3

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  • Transmission opportunity based group formation of secondary users for collaborative spectrum sensing in cognitive radio networks with multiple primary users

    116 ( 484 )   499 - 504   2017.3

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  • アラーム共起に基づくマルチベンダNW運用手順策定法の検討

    近藤 喜芳, 川原 純, 笹部 昌弘, 長谷川 輝之

    電子情報通信学会総合大会講演論文集   B-14-4   1 - 1   2017.3

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  • Tit-for-Tat型P2Pファイル配信におけるピアの途中離脱が平均ファイル取得時間に与える影響に関する一検討

    香山 侑槻, 笹部 昌弘, 笠原 正治

    電子情報通信学会総合大会講演論文集   B-6-87   1 - 1   2017.3

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  • 避難者・モバイル端末間連携型自動避難誘導における避難経路選択方式に関する一検討

    原 崇徳, 笹部 昌弘, 笠原 正治

    電子情報通信学会総合大会講演論文集   B-11-27   1 - 1   2017.3

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  • Automatic evacuation guiding scheme based on implicit interactions between evacuees and their mobile nodes

    Komatsu Nobuhisa, Sasabe Masahiro, Kawahara Jun, Kasahara Shoji

    2016.8

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  • On Congestion-Aware Route Selection for Automatic Evacuation Guiding Based on Cooperation between Evacuees and Their Mobile Nodes

    116 ( 161 )   1 - 6   2016.7

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  • 避難者・モバイル端末間連携に基づくオフライン型自動避難誘導アプリケーション

    糸井 純暉, 笹部 昌弘, 川原 純, 笠原 正治

    日本学術振興会産学協力研究委員会インターネット技術第 163 委員会meet39   2016.5

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  • Design, implementation, and evaluation of an offline evacuation guiding application considering positioning errors of mobile nodes

    115 ( 496 )   1 - 6   2016.3

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  • Evaluation of influence of a mobility model based on person trip data on DTN routing

    115 ( 496 )   13 - 18   2016.3

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  • On Information Sharing Scheme for Automatic Evacuation Guiding System Based on Cooperation between Evacuees and Their Mobile Nodes

    115 ( 496 )   7 - 12   2016.3

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  • Distributed Cooperative Control for Speedy and Effective Coverage in Mobile Sensor Networks

    115 ( 408 )   79 - 84   2016.1

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  • 避難者と携帯端末の連携に基づく避難誘導アプリケーションの設計

    糸井 純暉, 笹部 昌弘, 川原 純, 笠原 正治

    電子情報通信学会ソサイエティ大会講演論文集   B-15-8   1 - 1   2015.9

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  • B-15-8 Design of an evacuation guiding application based on cooperation between an evacuee and a mobile node

    Itoi Junki, Sasabe Masahiro, Kawahara Jun, Kasahara Shoji

    Proceedings of the Society Conference of IEICE   2015 ( 1 )   391 - 391   2015.8

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  • Path Enumeration Algorithm Using Zero-Suppressed Binary Decision Diagram for Path Selection in Overlay Networks

    115 ( 130 )   51 - 54   2015.7

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  • Poster : On Controllable Tit-for-Tat-Based P2P File Distribution

    115 ( 130 )   33 - 38   2015.7

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  • 被災パターンが端末の軌跡情報を用いた避難誘導システムに与える影響に関する一検討

    小松 展久, 笹部 昌弘, 川原 純, 笠原 正治

    日本学術振興会産学協力研究委員会インターネット技術第 163 委員会meet37   2015.5

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  • BI-4-5 Unconscious cooperation based control of P2P file distribution

    Sasabe Masahiro

    Proceedings of the IEICE General Conference   BI-4-5 ( 2 )   1 - 2   2015.3

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  • Overlay Multicast with Peak Traffic Constraints for Inter-Data Center Communication

    KANEKO Motoki, SASABE Masahiro, TAKINE Tetsuya

    IEICE technical report   114 ( 477 )   161 - 166   2015.3

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    Recently, service providers have been using data centers (DCs) to provide cloud services. When they use multiple DCs, which are geographically distributed, they require communication for maintenance operations among them, e.g., synchronization and update. Because such maintenance operations need to send identical data from one source to multiple destinations, we apply overlay multicast. Note that main traffic yielded by cloud services temporally changes and the charge for access links is determined by their peak traffic. In this paper, we aim to maximize the amount of overlay multicast traffic under the constraint of the peak traffic. We first formulate our problem as a linear programming. We further propose a scheme for estimating the peak traffic. Through simulation experiments, we show the effectiveness of the proposed method in terms of the amount of overlay multicast traffic and peak traffic.

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  • Visiting Order Considering Proximity between Clusters in Ferry-Assisted DTNs

    IZUMI Yoshiaki, SASABE Masahiro, TAKINE Tetsuya

    IEICE technical report   114 ( 477 )   523 - 528   2015.3

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    Recently, it is required to construct inexpensive communication infrastructures in rural areas and emergency networks in disaster areas. In such environments, there are multiple isolated clusters, such as villages in rural areas or emergency shelters in disaster areas. In this paper, we focus on ferry-assisted DTNs in which a special mobile node called a message ferry visits clusters to support communication with external networks through a special cluster, called a base cluster, which has access links. In the ferry assisted DTNs, visiting order of the message ferry determines the mean delivery delay of data (bundles), which is the average time interval from the generation of a bundle in a cluster to the completion of its delivery to the base cluster. In this paper, we propose a hybrid visiting order method that combines the two types of existing visiting order in consideration of the proximity between clusters. Through simulation experiments, we evaluate the effectiveness of the proposed method in terms of the average delivery delay.

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  • Monitoring Control Using Optimal Stopping Rule in Mobile Sensor Networks

    WATANABE Kazuma, SASABE Masahiro, TAKINE Tetsuya

    IEICE technical report   114 ( 477 )   577 - 582   2015.3

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    In recent years, there have been many studies on monitoring in mobile sensor networks, e.g., disaster prevention, crime prevention, environmental monitoring, and ecosystem monitoring. Because mobile sensors are usually powered by batteries, it is important to achieve monitoring with low power consumption. In this paper, we propose a monitoring scheme composed of two phases: search phase and observation phase. In the search phase, mobile sensors aim to discover important places speedily. After that, they continue to observe the important places in the observation phase. Under the assumption that importance values of places in a monitoring area are inde- pendent and identically distributed according to a uniform distribution, we formulate the optimal phase transition to be an optimal stopping problem and derive the optimal phase transition rule. Through both the numerical and simulation experiments, we show the effectiveness of the proposed scheme.

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  • Self-Organizing Resource Allocation Scheme Using Evolutionary Game Theoretic Approach for Large-Scale Distributed Systems

    YAMAGIWA Shingo, SASABE Masahiro, TAKINE Tetsuya

    IEICE technical report   114 ( 477 )   529 - 534   2015.3

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    Large distributed systems, such as peer-to-peer networks and wireless sensor networks, provide users with multiple services by using lots of computational resources. Because such resources are limited, it is important to allocate them dynamically in response to users' demands. Centralized resource allocation schemes, however, have a potential drawback of scalability. In this paper, we propose a decentralized resource allocation scheme, where agents, which are running on the computational resources, autonomously determine services to provide. Specifically, we apply evolutionary game theory to achieve self-organizing resource allocation. Through analysis and simulation experiments, we show the effectiveness of the proposed scheme in terms of convergence accuracy, spatial distribution of service share, and stability.

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  • BS-8-2 On detection of outlier trajectories in evacuation guiding system using trajectories of mobile terminals

    Otsuki Kohei, Kawahara Jun, Sasabe Masahiro, Kasahara Shoji

    Proceedings of the IEICE General Conference   BS-8-2 ( 2 )   1 - 2   2015.3

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  • Proposal and Evaluation of Evacuation Guiding Scheme Using Trajectories of Mobile Terminals

    KOMATSU Nobuhisa, SASABE Masahiro, KAWAHARA Jun, KASAHARA Shoji

    Technical report of IEICE. CQ   114 ( 404 )   101 - 106   2015.1

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    When large-scale disasters occur, evacuees have to evacuate to safe places quickly. In this paper, we propose an evacuation guiding scheme using mobile terminals of evacuees. Each terminal tries to navigate its evacuee by presenting an evacuation route. It can also trace the actual evacuation route of the evacuee as the trajectory by measuring his/her positions periodically. The proposed scheme automatically estimates blocked road segments from the difference between the presented evacuation route and actual evacuation route, then recalculates the alternative evacuation route. In addition, evacuees also share such information among them through communication with other mobile terminals and that with a server via communication infrastructures. Through simulation experiments, we evaluate fundamental characteristics of the proposed scheme, impact of degree of disaster, and effect of information sharing.

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  • 端末間での移動軌跡情報の共有による避難誘導効果に関する一検討

    笹部 昌弘, 小松 展久, 川原 純, 笠原 正治

    日本学術振興会産学協力研究委員会インターネット技術第 163 委員会meet36   2014.11

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  • Distributed cooperative control for speedy coverage in mobile sensor networks

    WATANABE Kazuma, SASABE Masahiro, TAKINE Tetsuya

    Technical report of IEICE. CQ   114 ( 131 )   45 - 50   2014.7

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    In recent years, mobile sensor networks have been expected to realize environmental monitoring and ecosystem monitoring. It is desirable that mobile sensors autonomously cooperate with each other in a distributed manner such that they can cover important locations in the target area. Game theoretical approaches have been attracting many researchers to achieve such distributed cooperative control. In the game theoretical approaches, we need to design a game model and a learning algorithm. The game model should be designed to enhance the accuracy of coverage in steady state. The learning algorithm should be designed to lead the system to appropriate steady states, independent of initial states. In this paper, we propose a learning algorithm where mobile sensors efficiently explore the area by sharing their search histories and speedily move to their appropriate locations. Through simulation experiments, we demonstrate that the proposed algorithm can achieve high accuracy of coverage even when each mobile sensor explores a limited range of the entire area.

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  • 遭遇端末と遭遇地点の特性に基づく蓄積運搬転送型ルーチング

    木村 共孝, 松浦 翼, 笹部 昌弘, 松田 崇弘, 滝根 哲哉

    電子情報通信学会技術研究報告(コミュニケーションクオリティ研究会)   114 ( 131 )   1 - 6   2014.7

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  • 大規模災害発生直後の被災状況推定・避難誘導システムの実現に向けて

    笹部 昌弘, 川原 純

    日本学術振興会産学協力研究委員会インターネット技術第 163 委員会meet35   2014.6

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  • DS-2-2 Network Environment Adaptive Store-Carry-Forward Routing

    Kimura Tomotaka, Matsuura Tsubasa, Sasabe Masahiro, Matsuda Takahiro, Takine Tetsuya

    Proceedings of the IEICE General Conference   2014 ( 1 )   "S - 24"-"S-25"   2014.3

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  • Analysis of Optimal Scheduling in Tit-for-Tat-based P2P File Distribution

    HASEGAWA Masashi, SASABE Masahiro, TAKINE Tetsuya

    IEICE technical report   113 ( 472 )   167 - 172   2014.3

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    Peer-to-Peer (P2P) file distribution systems can efficiently disseminate massive contents, such as disk images of operating systems, to many users in a piece-by-piece manner. In particular, BitTorrent protocol optimizes each peer's download speed by applying tit-for-tat (TFT) strategy, where each peer preferentially uploads piece(s) to peer(s) from which it can download missing pieces faster. To the best of our knowledge, however, it has not been sufficiently studied on the optimality of such TFT-based P2P file distribution. In this paper, we aim to figure out the optimal scheduling in the TFT-based P2P file distribution. First, we formulate the scheduling in TFT-based P2P file distribution as a integer linear programming, where the variables are piece transfers between peers at each time and the objective function is the minimization of the average file retrieving time among peers. Through the analysis of the optimal solution obtained by the existing solver, we reveal the characteristics of the optimal scheduling.

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  • しっぺ返し戦略を用いた P2P ファイル配信システムにおける最適なピース配送スケジュールの分析

    長谷川 雅史, 笹部 昌弘, 滝根 哲哉

    日本学術振興会産学協力研究委員会インターネット技術第 163 委員会meet34   2013.10

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  • 進化ゲーム理論を用いた自己組織型サービス選択方式

    笹部 昌弘, 滝根 哲哉

    日本学術振興会産学協力研究委員会インターネット技術第 163 委員会meet33   2013.5

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  • 進化ゲーム理論の情報ネットワークへの応用

    笹部 昌弘

    計測自動制御学会 関西支部 物理と情報をつなぐ次世代システム制御研究会 第三回講演会   2013.3

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  • Tree-Set Selection for High-Speed Multicast in Overlay Networks with Linear Capacity Constraints

    MIZUGUCHI Hiroaki, SASABE Masahiro, TAKINE Tetsuya

    IEICE technical report. Information networks   112 ( 393 )   51 - 56   2013.1

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    Because overlay networks for inter-data center communication are composed of reliable nodes, high-speed overlay multicast is expected to be realized using the information about the underlying IP networks. In this paper, we aim to achieve the high-speed multicast based on multiple trees by taking account of the IP-level interference between them. We first formulate the tree-set selection problem for high-speed multicast in overlay networks with linear capacity constraints. We further propose a space-efficient heuristic algorithm to solve this problem. Through numerical results, we show that the heuristic algorithm can obtain quasi-optimal tree set.

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  • 高スループット実現のためのオーバレイマルチキャストツリー集合の構築手法

    水口 弘明, 笹部 昌弘, 滝根 哲哉

    日本学術振興会産学協力研究委員会インターネット技術第 163 委員会meet32   2012.11

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  • Grouping Clusters to Minimize the Total Mean Delivery Delay of Bundles in Ferry-assisted DTNs

    K. Habibul Kabir, Masahiro Sasabe, Tetsuya Takine

    電子情報通信学会技術研究報告(ネットワークシステム研究会)   111 ( 408 )   87 - 92   2012.5

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    Communication among isolated networks (clusters) in delay tolerant networks (DTNs) can be supported by a message ferry, which collects bundles from clusters and delivers them to a sink node. When there are lots of distant static clusters, multiple message ferries and sink nodes will be required. In this paper, we aim to make groups each of which consists of physically close clusters, a sink node, and a message ferry. Our main objective is minimizing the overall mean delivery delay of bundles in consideration of both offered load of clusters and distance between clusters and their sink nodes. We first model this problem as a nonlinear integer programming, based on the knowledge obtained in our previous work. Because it might be hard to solve this problem directly, we take two-step optimization approach based on linear integer programming, which yields an approximate solution of the problem. Through numerical results, we show the two-step optimization approach works well.

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  • 疎密度モバイルアドホック網における重み付き平均を用いた時刻同期方式

    飴村 壮史, 笹部 昌弘, 滝根 哲哉

    日本学術振興会産学協力研究委員会インターネット技術第 163 委員会meet30   2011.11

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  • 疎密度モバイルアドホック網における単純平均法に基づく相対的時刻同期

    笹部 昌弘, 滝根 哲哉

    日本学術振興会産学協力研究委員会インターネット技術第 163 委員会meet28   2010.11

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  • Evaluation of user behavior and system availability based on measurement of BitTorrent

    GODA Shin, SASABE Masahiro, TAKINE Tetsuya

    IEICE technical report   110 ( 116 )   85 - 90   2010.7

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    Each user in the Peer-to-Peer (P2P) file-sharing systems potentially tends to maximize its own benefit rather than the overall system efficiency and performance. On the other hand, there are lots of indistinct points left in the users' selfish behavior and its influence on the system performance. In this paper, we measure the BitTorrent system, which is one of the most famous P2P file-sharing systems, and evaluate users' behavior and system availability. The measurement is conducted through communications with a tracker which manages information about peers sharing the files and with each of those peers. The measurement result shows that about half of users stop opening the file to the public within several hours after completing the file retrieval. In addition, we show that the system is supported not only by a few peers that remain to be providers of the file for a long term, but also by most peers that are temporal suppliers during their own file retrieval.

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  • Real-Time Measurement of Frequently Distributed Files in P2P File-Sharing Systems

    MATSUMORI Tomoya, SASABE Masahiro, TAKINE Tetsuya

    IEICE technical report   109 ( 79 )   5 - 10   2009.6

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    Since files are directly exchanged between nodes in P2P file-sharing systems such as Winny and Bittorrent, it is difficult to comprehensively grasp the system conditions and control the system dynamics. In this paper, we design and implement a system that can achieve real-time measurement of files which are highly interested and frequently distributed over the Winny network. We introduce a node for the measurement into the Winny network and passively measure queries passing through the node with low measurement overhead and high adaptability to the changes of network conditions. To achieve the real-time measurement, we combine the sliding window method and frequent pattern mining. The experimental results show that we can clearly reveal the transition of frequently distributed files in real-time.

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  • Power control methods considering radio interference and path length for wireless mesh networks

    HIDEKUMA Toshiaki, HASEGAWA Go, SASABE Masahiro, NAKANO Hirotaka

    IEICE technical report   108 ( 481 )   7 - 12   2009.3

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    Wireless Mesh Networks (WMNs) have attracted significant interest as a cost-effective wireless network infrastructure. However, the efficiency of wireless resource utilization decreases by radio interference when multiple transmissions in an interference region occur simultaneously. One of possible solutions for this problem is to control the transmission power of mesh nodes. In this report, we propose a power control method of wireless mesh nodes for increasing spatial reuse in WMNs with TDMA MAC protocol. The proposed method decreases radio interference, considering the ill-effect of the increase in path length by cutting too many wireless links. Numerical evaluation results reveal that the proposed method decreases the frame length by up to 27% with non-sensitive parameter setting.

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  • Load-balanced and interference-aware spanning tree construction algorithm for TDMA-based wireless mesh networks

    TOKITO Hiroshi, SASABE Masahiro, HASEGAWA Go, NAKANO Hirotaka

    IEICE technical report   108 ( 481 )   1 - 6   2009.3

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    Wireless mesh networks have been attracting many users in recent years. By connecting base stations (mesh nodes) with each other via wireless connections, they can achieve a wide-area wireless environment with flexible-configuration and low-cost properties at the risk of radio interference between wireless links. When we utilize the wireless mesh networks as an infrastructure for Internet access, all network traffic from mobile nodes goes through a gateway node which is directly connected to the wired network. Therefore, we need to distribute the traffic load by deploying multiple gateway nodes. In this paper, we propose a spanning tree construction algorithm for TDMA-based wireless mesh networks with multiple gateway nodes, which aims to maximize the traffic going to wired network (system throughput) by taking account of the traffic load on the gateway nodes, the access link capacity and the radio interference. Through simulation experiments, we show that the proposed algorithm increases the system throughput regardless of the bottleneck position and achieves up to 3.1 times higher system throughput than the conventional algorithm.

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  • 無線メッシュネットワーク容量向上のためのノード電力制御手法

    秀熊 俊昭, 長谷川 剛, 笹部 昌弘, 中野 博隆

    電子情報通信学会技術研究報告(第6回QoSワークショップ)   2008.12

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  • 無線メッシュネットワークにおける経路制御によるゲートウェイ負荷の均一化

    時任 宏, 笹部 昌弘, 長谷川 剛, 中野 博隆

    電子情報通信学会技術研究報告(第6回QoSワークショップ)   2008.12

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  • 進化ゲーム理論を用いた P2P ファイル共有システムの性能評価

    松田 悠介, 笹部 昌弘, 滝根 哲哉

    日本学術振興会産学協力研究委員会インターネット技術第 163 委員会meet24   2008.11

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  • A Study on Performance Evaluation of P2P File Sharing under Heterogeneous User Environments: Evolutionary Game Theoretic Approach

    Yusuke Matsuda, Masahiro Sasabe, Tetsuya Takine

    IEICE technical report   108 ( 203 )   51 - 56   2008.9

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    In Peer-to-Peer (P2P) file sharing systems, file availability is improved by users cooperatively caching and sharing files. However, many users may hesitate to cache files cooperatively due to the cost for caching, such as storage consumption, processing load, and bandwidth consumption. In such a case, unpopular files are likely to disappear from the system. In this paper, we reveal how the selfish user behavior affects the system performance using evolutionary game theoretic approach. Specifically, we focus on situations where users are heterogeneous in terms of aggressiveness in cooperative caching. Analytical results show that the user heterogeneity contributes to the stability of file availability.

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  • Power control method for increasing capacity in wireless mesh networks

    IEICE technical report   108 ( 151 )   61 - 66   2008.7

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  • 無線メッシュネットワークにおけるゲートウェイ負荷を均一化するための経路制御手法

    時任 宏, 笹部 昌弘, 長谷川 剛, 中野 博隆

    電子情報通信学会技術研究報告(アドホックネットワーク研究会)   108 ( 151 )   73 - 78   2008.7

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    Other Link: https://ndlsearch.ndl.go.jp/books/R000000004-I9604517

  • Tracking moving objects across multiple regions by successive bayesian estimation

    WATANABE Takafumi, SASABE Masahiro, NAKANO Hirotaka

    IEICE technical report   107 ( 524 )   353 - 358   2008.3

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    In this paper, we focus on tracking moving objects in a building using a binary-sensor network. In buildings, there are multiple points where objects temporarily change their velocities, such as doors and stairs. We call these points as gates. We assume that the velocity of an object does not almost change before and after passing a gate. We first divide the entire area in a building into multiple sub-regions each of which has gates as their entrances. To track objects in a sub-region, we apply the conventional method based on a Bayesian estimation. The conventional method conducts object tracking using statistically obtained information on object velocities. We expect that we can improve accuracy of object tracking by proposing a method to share the velocity information among sub-regions. Through simulation experiments, we demonstrate that the accuracy of object tracking has a maximum of 35% improvements compared with the conventional method.

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  • Improving Success Ratio of Object Search in Highly-Dynamic Mobile P2P Networks

    TAKESHITA Kei, SASABE Masahiro, NAKANO Hirotaka

    IEICE technical report   107 ( 445 )   1 - 6   2008.1

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    With the wide spread of mobile devices, information discovery methods over mobile ad hoc networks (MANETs) are required. Recent studies have revealed that integrating a distributed hash table (DHT) substrate and network-layer routing can increase search efficiency. Furthermore, some researchers have additionally proposed a clustering method which groups the overlay nodes according to their physical distance. However, it has also been pointed out that the search efficiency deteriorates in highly dynamic environments. In this paper, we propose a method sharing pointers among nodes in a cluster. Through simulation experiments, we show that the proposed method improves the success ratio of object search up to 40% compared with existing method.

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  • 無線ネットワーク容量を最大化する通信距離の導出

    時任 宏, 笹部 昌弘, 中野 博隆

    日本学術振興会産学協力研究委員会インターネット技術第 163 委員会meet22   2007.11

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  • Rapid Readout of Multiple RFIDs by Response Probability Control Method Reviewed

    Hirotaka Nakano, Wataru Nagate, Yusuke Hirano, Masahiro Sasabe

    IEICE Transactions on Electronics   90 ( 6 )   491 - 501   2007.6

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  • 領域に対するノードの出入りを考慮した移動モデル

    相原 聖, 笹部 昌弘, 中野 博隆

    電子情報通信学会技術研究報告(コミュニケーションクオリティ研究会)   107 ( 19 )   19 - 24   2007.4

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    本稿では,BluetoothやZigBeeなどセル範囲の小さな通信方式を対象としたサービス領域において,領域の境界におけるノードの動きから領域内のノード分布を推定するモデルを提案する.提案モデルでは,領域に対するノードの出入りを観測し,領域内のノードの移動を再現する.まず,ノードとして人に着目し,実際に人が通行する場所を観測した.観測結果から,領域内におけるノードの移動軌跡が直線で近似できること,移動速度が正規分布に従うことが分かった.さらに,ノードの侵入位置と離脱位置の対応付けを推測する方法として,組み合わせ最適化及びベイズ推定を利用した推定法を提案した.評価の結果,対応付けの再現率は,組み合わせ最適化による推定法では0.736,ベイズ推定法では1となった.

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  • 通信距離の最適化による無線ネットワーク容量の向上

    時任 宏, 笹部 昌弘, 中野 博隆

    電子情報通信学会技術研究報告(情報ネットワーク研究会)   106 ( 578 )   95 - 100   2007.3

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  • Caching Algorithms using Evolutionary Game Theory in a File-Sharing System

    SASABE Masahiro, WAKAMIYA Naoki, MURATA Masayuki

    IEICE technical report   106 ( 461 )   97 - 102   2007.1

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    In a P2P file-sharing system, a node finds and retrieves its desired file. If multiple nodes cache the same file to provide others, we can achieve a file-sharing system with low latency and high file availability. However, a node has to spend costs, e.g., processing load or storage capacity, on caching of a file. Consequently, a node may selfishly behave and hesitate to cache a file. In such a case, there is a possibility that unpopular files disappear from the system. In this paper, we aim to accomplish effective caching in the whole system that emerges from autonomous and selfish node behaviors. We first discuss relationship between selfish node behaviors and system dynamics according to evolutionary game theory. As a result, we show that a file-sharing system can be robust to file disappearance depending on a model of cost and demand for caching even if nodes behave selfishly.

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  • A Construction Method of a Low-Diameter, Location-Aware, and Resilient P2P Network

    SASABE Masahiro, WAKAMIYA Naoki, MURATA Masayuki

    IEICE technical report   105 ( 628 )   131 - 136   2006.3

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    Since a peer searches for its desired file in a P2P file sharing system, the structure of an overlay network determines the effectiveness of search in terms of network load and search latency. In this paper, based on the Barabasi-Albert (BA) model, we propose a novel method to construct a low-diameter and location-aware overlay network where peers can find physically-close providers without introducing much load on underlying physical networks. We also propose a rewiring method to improve the structure of the overlay network and a recovery method to cope with random peer departures and malicious attacks. Through several simulation experiments using real physical topologies, we found that the proposed methods could construct a resilient overlay network that improved reachability up to 60% compared with BA model while shortening physical distance from neighboring peers.

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  • SB-10-2 Cache Replacement Algorithm for P2P Media Streaming(SB-10. Latest Trends on Broadband Contents Delivery Technologies)

    SASABE Masahiro, WAKAMIYA Naoki, MURATA Masayuki, MIYAHARA Hideo

    Proceedings of the IEICE General Conference   2004 ( 2 )   "SE - 3"-"SE-4"   2004.3

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  • Third International Conference on Peer-to-Peer Computing (P2P 2003) Reviewed

    SASABE Masahiro

    Systems, control and information   48 ( 2 )   75 - 75   2004.2

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  • Scalable Methods for Media Streaming on Peer-to-Peer Networks

    SASABE Masahiro, WAKAMIYA Naoki, MURATA Masayuki, MIYAHARA Hideo

    IEICE technical report. Information networks   103 ( 311 )   71 - 76   2003.9

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    With the growth of computing power and the proliferation of broadband access to the Internet, media streaming has widely diffused. By using the P2P communication architecture, media streaming can be expected to smoothly react to network conditions and changes in user demands for media-streams. In this paper, we propose efficient methods to achieve continuous and scalable media streaming system. In our mechanisms, a media stream is divided into blocks for efficient use of network bandwidth and storage space. We propose scalable search methods, algorithms to determine an optimum provider peer from search results, and a caching algorithm considering on the balance between supply and demand for media streams. Through several simulation experiments, it was shown that proposed mechanisms could accomplish continuous media streaming without deteriorating the system scalability.

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  • P2P ネットワークにおけるストリーム型情報資源共有機構

    笹部 昌弘, 若宮 直紀, 村田 正幸, 宮原 秀夫

    日本学術振興会産学協力研究委員会インターネット技術第 163 委員会meet13   2003.5

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  • Implementation and Evaluation of Proxy Caching Mechanisms with Video Quality Adjustment Reviewed

    Masahiro Sasabe, Yoshiaki Taniguchi, Naoki Wakamiya, Masayuki Murata

    Proc. of International Technical Conference On Circuits/Systems, Computers and Communications (ITC-CSCC)   102 ( 191 )   121 - 124   2002.7

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    The proxy mechanism widely used in WWW systems offers low-delay data delivery by means of "proxy server". By applying proxy mechanisms to the video streaming system, we expect that high-quality and low-delay video distribution can be accomplished without introducing extra load on a system. In addition, it is effective for proxy to adapt the quality of cached video data to users requests if requests are diverse due to heterogeneity in terms of the available bandwidth, end-system performance, and user's preferences on the perceived video quality. We have proposed proxy caching mechanisms to accomplish the high-quality and highly-interactive video streaming services. In our proposed system, a video stream is divided into blocks for efficient use of a cache buffer. A proxy server is assumed to be able to adjust the quality of a cached or retrieved video block to a request through video filters. In this paper, to verify the practicality of our mechanisms, we implemented them on a real system and conducted experiments. Through evaluations from several performance aspects, it was shown that our proposed mechanisms can provide users with a video streaming service in a heterogeneous environment.

    DOI: 10.11485/itetr.26.48.0_41

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  • Caching mechanisms for proxy cache with quality adaptation

    SASABE Masahiro, WAKAMIYA Naoki, MURATA Masayuki, MIYAHARA Hideo

    IEICE technical report   121 ( 121 )   31 - 36   2001.6

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    The proxy mechanism is now widely used in WWW system in order to offer low-delay data delivery with an assistance of the "proxy server". By applying the proxy mechanism to video transfer, we can expect a low-delay and interactive video streaming service provided without intoroducing extra load on the stream. In addition, if the proxy appropriately adapts the quality of cached video data to the requested quality, video streams can be delivered to users by considering their heterogeneous QoS requirements. In this paper, we consider mechanisms of data retrieval, prefetching and replacement for the proxy cache. Through simulation experiments, we show that our proposed proxy caching mechanism achieves a high-quality and low-delay video distribution which meeting user's demand.

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Research Projects

  • 生成AIを支える持続可能なネットワーク・コンピューティング

    Grant number:25K03114  2025.4 - 2029.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    笹部 昌弘, 原 崇徳

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    Authorship:Principal investigator 

    Grant amount:\18720000 ( Direct Cost: \14400000 、 Indirect Cost:\4320000 )

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  • Sustainable NFV Networking based on Mathematical Optimization and Spatio-Temporal GNN

    Grant number:22H03586  2022.4 - 2025.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Grant amount:\17420000 ( Direct Cost: \13400000 、 Indirect Cost:\4020000 )

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  • Analysis of Interruption Risk of Information Diffusion in Consensus Formation based on Bitcoin-like Competitive Information Diffusion

    Grant number:19KT0045  2019.7 - 2022.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Sasabe Masahiro

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    Grant amount:\4290000 ( Direct Cost: \3300000 、 Indirect Cost:\990000 )

    With the help of blockchain technology, the cryptocurrency system Bitcoin achieves consensus on the ledger among anonymous users in a distributed manner. We focus on the interruption risk of the competitive information diffusion mechanism, which plays one of the key roles in achieving the tamper-proof nature of blockchain. In particular, with the help of the deterministic nonlinear model for the propagation of infectious diseases in mathematical epidemiology, we have developed standby-interrupted-retrieved-attackable (SIRA) models. Through numerical evaluation, we have quantitatively revealed the interruption risk and further proposed countermeasures against it.

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  • Informatics Study on Ultra-Scalable Blockchain Technology

    Grant number:19H01103  2019.4 - 2023.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

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    Grant amount:\45500000 ( Direct Cost: \35000000 、 Indirect Cost:\10500000 )

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  • Selfish yet Optimal Service Chaining in NFV Networks

    Grant number:19K11942  2019.4 - 2022.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Sasabe Masahiro

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    Grant amount:\4290000 ( Direct Cost: \3300000 、 Indirect Cost:\990000 )

    Network functions virtualization (NFV) technologies have been expected to realize diverse services in a flexible manner. In NFV networks, a certain network service can be realized as a sequence of one or more functions (i.e., service chain). The construction problem of a service chain is called service chaining, which causes resource competition among users. In this research, we have first revealed that the service chaining and function placement can be modeled as a capacitated shortest path tour problem based integer linear program (CSPTP-based ILP) and have proposed selfish yet optimal control to realize the social optimal even under selfish decision making by each user.

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  • Autonomous Distributed Cooperation Mechanism for Wireless Networks with an Explosive Number of Wireless Nodes

    Grant number:15H04008  2015.4 - 2019.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Kasahara Shoji, SASABE Masahiro, KAWAHARA Jun, ZHANG Yuanyu

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    Grant amount:\16770000 ( Direct Cost: \12900000 、 Indirect Cost:\3870000 )

    In this research project, we considered autonomous distributed mechanisms for cooperative sensing in cognitive radio networks with an extremely huge number of wireless nodes. We proposed two schemes: collaborative spectrum sensing mechanism based on system load and detection performance of wireless nodes, and a coalition formation method based on machine learning technique. In the former scheme, we developed the merge-split algorithm with incentive mechanism under game theory, while the latter was developed with Multi-Armed Bandit problem. We investigated the performance of proposed methods by simulation experiments, validating those effectiveness quantitatively.

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  • Study on Controllable P2P Content Distribution Based on Game Theoretic Approach

    Grant number:15K00126  2015.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    SASABE Masahiro

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    Grant amount:\4680000 ( Direct Cost: \3600000 、 Indirect Cost:\1080000 )

    In peer-to-peer (P2P) content distribution, users' nodes, called peers, send received fragments of the original file, i.e., pieces, to others, which can alleviate the server's load. Tit-for-tat (TFT) strategy in game theory can encourage cooperation among peers, i.e., each peer has to provide fragments of the original file, called pieces, to others so as to retrieve its demanding pieces from them. In this study, we reveal that the server's indirect control of P2P content distribution can be achieved by the combination of server's piece sending strategy and TFT constraint among peers.

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  • Relative clock synchronization in Delay Tolerant Network

    Grant number:22700070  2010 - 2012

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

    SASABE Masahiro

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    Grant amount:\3770000 ( Direct Cost: \2900000 、 Indirect Cost:\870000 )

    In delay tolerant networks, global clock synchronization among nodes is a challenging problem because reference clock information cannot be disseminated promptly over nodes due to the lack of stable connections among nodes. We proposed averaging-based algorithms for distributed global clock synchronization, where two mobile nodes exchange their local clock times when they meet and adjust their own clocks to the average of them. We further conducted the continuous-time analysis and revealed how the clock accuracy of nodes and meeting rates among them affect the rate of convergence to the steady state and the accuracy of clock synchronization in steady state.

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  • Research on Information Transfer in Challenged Networks

    Grant number:22500056  2010 - 2012

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    TAKINE Tetsuya, MATSUDA Takahiro, SASABE Masahiro

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    Grant amount:\4290000 ( Direct Cost: \3300000 、 Indirect Cost:\990000 )

    Research on information transfer in challenged networks was conducted. We developed a buffer management scheme in sparsely populated mobile ad hocnetworks, aiming to maximize the delivery ratio and to minimize the mean delivery delay.We also developed a method of finding relay nodes so as to minimize the mean deliverydelay, which utilizes local information only available at each node. We also developedsystem parameter optimization methods for layered 3D underwater sensor networks withsingle-copy routing and epidemic routing. Furthermore, we developed methods of findingan optimal visiting order of clusters and grouping clusters in ferry-assisted delay tolerantnetworks in order to minimize the mean delivery delay.

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  • Realization of Large-Scale Distributed Systems Robust Against Selfish User Behavior

    Grant number:20700061  2008 - 2009

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

    SASABE Masahiro

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    Grant amount:\2860000 ( Direct Cost: \2200000 、 Indirect Cost:\660000 )

    I focused on P2P file-sharing systems as an example of large-scale distributed systems and examined the relationship between selfish user behavior and system performance. I first made modeling of the selfish user behavior under the framework of game theory, then revealed how the interactions among selfish users affects the system performance with the help of evolutionary game theory. Through mathematical analyses and simulation evaluations, we can achieve robust file-sharing systems against file disappearance independent of the degree of user selfishness when each user rationally behaves : He/she keeps and shares a file only when the file is likely to disappear from the network without his/her help.

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  • Implementation and evaluation of simultaneous readout of huge quantities of electronic tags

    Grant number:19360173  2007 - 2008

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    NAKANO Hirotaka, HASEGAWA Go, SASABE Masahiro

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    Grant amount:\7800000 ( Direct Cost: \6000000 、 Indirect Cost:\1800000 )

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  • Network control methods for information networks having power-law degree distribution

    Grant number:18200004  2006 - 2008

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    MURATA Masayuki, TAKINE Tetsuya, WAKAMIYA Naoki, HASEGAWA Go, ARAKAWA Shinichi, SASABE Masahiro

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    Grant amount:\38870000 ( Direct Cost: \29900000 、 Indirect Cost:\8970000 )

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  • P2PネットワークにおけるユーザQoSを考慮した検索手法に関する研究

    Grant number:17700058  2005 - 2007

    日本学術振興会  科学研究費助成事業  若手研究(B)

    笹部 昌弘

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    Grant amount:\3700000 ( Direct Cost: \3700000 )

    本年度は大きく分けて2つの研究成果を得た.
    1つ目は,協力的なキャッシングによる,低遅延かつファイル可用性の高いファイル共有システムの実現である.ファイル共有システムを構成するノードはユーザ端末であり,それぞれが利己的に振る舞うと,十分にファイルがキャッシュされず,特に人気の低いファイルがシステムから消失するなどの問題が発生する可能性がある.昨年度の成果により,キャッシングに対するコストと需要のモデルによっては,ノードが利己的に振る舞ったとしてもファイル可用性の高い,低遅延なファイル共有システムが実現可能であることを示した.本年度は,さらにユーザごとのファイルのキャッシングに対する協力性が異なる,すなわちユーザが多様である状況に着目し,適切なキャッシングの実現可能性について検討した.現実的な環境では,非協力的なユーザが多数,協力的なユーザが少数を占めると考えられるため,ユーザの多様性をZipf則でモデル化した.個々の振る舞いがシステム全体としての特性に与える影響を明らかにすることのできる進化ゲーム理論を用いることで,ユーザの多様性が大きいほどファイル可用性は低下するものの,ある一定の値に収束し,またシステム全体としては安定することを示した.
    2つ目は,モバイル環境下でのP2Pファイル共有システムにおける検索効率の向上手法の提案である.災害発生時,イベント会場での催事などインフラが使用できない状況では,端末間で一時的に構築した無線ネットワーク上でファイルや情報を発見するための仕組みが必要となる.本研究では,分散ハッシュテーブル(DHT)とファイルの複製技術を組み合わせた手法を用いることで,ノードの移動による高変動な環境下においても高いファイル検索成功率を実現できることを示した.

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  • P2P型通信アーキテクチャにもとづく動画像配信システムに関する研究

    Grant number:03J50671  2003 - 2004

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    笹部 昌弘

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    Grant amount:\1700000 ( Direct Cost: \1700000 )

    昨年度は,ピアの移動・消失およびネットワークの輻輳といったシステム変動が発生しない理想的な環境における提案手法の基本特性を明らかにした.しかしながら,実際のネットワークにおいてはそうしたシステム変動による影響を考慮する必要があるため,本年度はシステム変動が発生する環境下においても途切れない動画像再生を実現するために,昨年度における提案手法(従来手法)を改良・拡張した.
    1.ピアの移動・消失およびネットワークの輻輳を考慮した適切な取得先ピアの選択・切替手法
    ピアの移動・消失およびネットワークの輻輳はいずれの場合においても動画像転送に利用可能な帯域および遅延の変化としてみなすことができる.こうしたシステム変動による帯域の低下や遅延の増大は動画像再生中の途切れにつながるため,観測・計測された利用可能な帯域および遅延をもとに動的に適切な取得先ピアを決定,切り替えるための仕組みが必要となる.本研究では,取得先の切替が必要であると判断する基準を明らかにするとともに,切替が必要と判断された場合の適切な切替先の決定手法について提案した.
    2.ピアの移動・消失による,動画像データ検索時の発見確率の低下を抑えるための手法
    従来手法では,過去の検索履歴をもとに検索対象となるピアを決定していた.このことにより,システム内のピア数が増大しても検索対象となるピア数の増加を抑えることができ,その結果ネットワーク内を流れる検索トラヒック量を低く抑えることが可能となった.しかしながら,ピアの移動・消失が発生すると,過去の検索履歴の信頼度が低下してしまう.この問題に対して,本研究では検索対象となるピアを絞り込むための判断基準の改良を行った.ピアの移動・消失を予測することは難しいため,それらが発生した場合においても出来る限り検索が成功するようにする必要がある.本研究では,所望のデータに対して過去の検索履歴に複数の所有者が存在する場合には検索対象となるピアをそれらに限定し,そうでなければ検索対象を広げるという手法を提案した.
    上記の提案手法を計算機によるシミュレーションを通して評価し,動画像再生の連続性の観点から,改良手法が従来手法に比べて有効であることを示した.さらに,ネットワーク内のキャッシュ容量とメディアの種類の関係について,改良手法の適用領域も明らかにした.

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