G. Tsuchida

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In mobile ad hoc networks, changes in topology caused by the movement of hosts and changes in radio link connectivity make it difficult for mobile hosts to maintain access to data on other hosts. To solve such a problem, replica distribution methods which distribute replicas of data items to other mobile hosts and maintain them have been proposed; we have(More)
We propose link-aware and density based replica arrangement (LDR) method for dynamical arrangement of replicas of location dependent data that addresses the difficulties encountered by mobile hosts in ad hoc networks when trying to access data on other hosts due to the movement of hosts, obstacles, etc. In this LDR method, replicas of location dependent(More)
In this paper we propose Road-aware Skip Copy (RSC) method for distributing replicas of location-dependent data on server-less vehicular ad hoc networks in urban areas. In the RSC method, mobile nodes broadcast replicas of data item near intersections in order to distribute replicas to many nodes with small number of broadcasts, and it limits the number of(More)
In this paper we propose an efficient geocasting scheme based on flooding for cases where a source node sends request messages to nodes in the destination area and receives replies from some of them, Geocasting based on Successful Transmission Records (GSTR). Generally geocast protocols based on flooding generate many redundant messages which generate(More)
基地局などのインフラを利用することなく,無線端末 間で動的に形成されるネットワークのことを無線アドホッ クネットワークという.無線アドホックネットワークで は,無線端末が直接通信できない場合は,各端末がルー タのように振る舞い,他の端末を中継することで通信可 能となる.アドホックネットワークは,既存のインフラが 使えない時でもネットワークが構築できるため,災害時, 軍事,会議の場などへの応用が考えられている.筆者ら の研究グループでは,災害発生時に災害現場に展開した 救助隊員などが,各部隊の現在位置の被害状況を把握し ながら作業を進め,位置に依存した情報を効率的に収集 するというシナリオを想定し,アドホックネットワーク を利用した効率的な情報共有方法について検討している.(More)
In mobile ad hoc networks, due to the movement of hosts, obstacles, etc, it is difficult for mobile hosts to access the data on other hosts. To solve this problem, replica distribution methods which distribute the replicas of data items to other hosts and maintain them have been proposed. We have proposed LDR (Link-aware and Density-based Rearrangement)(More)
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