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A schedule-based approach, such as time division multiple access, is more efficient than a contention-based approach in terms of energy saving by switching sensors into sleeping mode. However, it does not use the transmission media effectively as each time slot is dedicated to a sensor and therefore cannot be used by others should it be idle. Moreover, a schedule-based approach requires a central...
In distributed systems, a group of multiple processes are required to cooperate with each other to achieve some objectives. In this paper, we consider a distributed system where there is o centralized coordinator. Each member process is peer, i.e. each peer has to autonomously make a decision by itself through communicating with other peers in a group. Each peer sends a message to every peer and every...
The Wireless Sensor Networks (WSNs) have a wide range of applications such as target detection and tracking, environmental monitoring, and tactical systems. However, lower sensing ranges result in dense networks, which brings the necessity to achieve an efficient medium access protocol subject to power constraints. Various MAC protocols with different objectives were proposed for wireless sensor networks...
Wireless sensor networks are appealing to researchers due to their wide range of application potential in areas such as target detection and tracking, environmental monitoring, and tactical systems. However, lower sensing ranges result in dense networks, which bring the necessity to achieve an effcient medium access protocl subject to power constraints. Various MAC protocols with different objectives...
In sensor networks, small sensor nodes which are distributed in an area send various data and send them to the sink node by multi-hop transmission. The sensor networks cover various application fields such as safety management, health management, grasping of nature environment, military and so on. The sensor networks will be used as a technique for constructing ubiquitous society because of low cost...
A group of multiple peers are required to cooperate with each other in distributed peer-to-peer (P2P) applications. Here, messages have to be causally delivered to every peer. In our approach to realizing a scalable P2P group, messages are ordered by taking advantage of linear time (LT) and physical time (PT) since message length is O(1). Here, each peer has to hold information on clock accuracy of...
Much work has been done on routing in Ad-hoc networks, but the proposed routing solutions only deal with the best effort data traffic. Connections with Quality of Service (QoS) requirements, such as voice channels with delay and bandwidth constraints, are not supported. The QoS routing has been receiving increasingly intensive attention, but searching for the shortest path with many metrics is an...
A group of peers are required to cooperate with each other in distributed applications on P2P overlay networks. In order to realize a scalable P2P group, messages are causally ordered by taking advantage of linear time (LT) and physical time (PT) since message length is O(1) in this paper. In this paper, we newly discuss a multi-layered model to realize a scalable group. A group is hierarchically...
A schedule-based approach, such as TDMA, is more efficient than a Contention-based approach in terms of energy saving by switching sensors into sleeping mode. However it does not use the transmission media effectively as each timeslot is dedicated to a sensor and therefore cannot be used by others should it be idle. Moreover a schedule-based approach requires a central node to manage and broadcast...
In peer-to-peer (P2P) applications, a group of multiple peer processes (peers) are required to cooperate with each other in a distributed manner. Messages sent by peers have to be causally delivered to every peer in a group. Due to the message overhead O(n) for the number n of peers, the vector clock cannot be used to causally deliver messages in a scalable group. On the other hand, the linear clock...
In distributed peer-to-peer (P2P) applications, a group of multiple peer processes (peers) are required to cooperate with each other. Messages sent by peers have to be causally delivered. In this paper, we discuss a scalable group communication protocol for a group of multiple peers in P2P overlay networks. Due to the message overhead O(n) for the number n of peers, the vector clock cannot be used...
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