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The ubiquitous sensing-capable mobile devices have been fuelling the new paradigm of Mobile Crowd Sensing (MCS) to collect data about their surrounding environment. To ensure the timeliness and quality of the data samples in MCS, it is critical to select qualified participants to maintain sensing coverage ratios over important spatial areas (i.e., hotspots) during time periods of interest and meet...
Replicas of multimedia objects are distributed to peers in overlay networks. Multimedia objects are characterized in terms of not only data structure parameter but also quality of service (QoS) parameters like frame rate. Replicas have to be synchronized to be mutually consistent. Each parameter of a replica is read and written by transactions. Thus, the data structure and QoS parameters of a replica...
In peer-to-peer (P2P) overlay networks, a group of multiple peers have to cooperate with each other. P2P systems are in nature scalable distributed systems, where there is no centralized coordinator. It is difficult for each peer to communicate with every other peer. An acquaintance peer of a peer is another peer with which the peer can directly communicate. Each peer has to obtain access and location...
Replicas of multimedia objects are distributed to peers in overlay networks. In quorum-based (QB) protocols, every replica may not be up-to-date and the up-to-date replica can be found in the version counter. Multimedia objects are characterized in terms of not only data structure but also quality of service (QoS) parameters like frame rate. Each parameter of a replica is read while there is a read...
In peer-to-peer (P2P) overlay networks, a group of multiple peers have to cooperate with each other. P2P systems are in nature scalable distributed systems, where there is no centralized coordinator. It is difficult, maybe impossible for each peer to communicate with every other peer in P2P overlay networks. An acquaintance peer of a peer is another peer with which the peer can directly communicate...
Replicas of multimedia objects are distributed to peers through downloading and caching in peer-to-peer(P2P) overlay networks. Every replica has to be consistent. In quorum-based (QB) protocols, every replica may not be up-to-date and the up-to-date replicas can be found in the version counters. On the other hand, multimedia objects are characterized in terms of not only data structure parameter but...
Multimedia objects are distributed to peers through downloading and caching in peer-to-peer (P2P) overlay networks. In the quorum-based (QB) protocols, every replica of an object is not up-to-date and the replicas are totally ordered in the version counters. On the other hand, multimedia objects are characterized in terms of not only data structure but also quality of service (QoS) like number of...
Multimedia objects are distributed to peers through downloading and caching in peer-to-peer (P2P) overlay networks. Multimedia objects are characterized in terms of not only data structure but also quality of service (QoS). Replicas of a multimedia object are partially ordered in terms of newness of data structure and QoS. We discuss the multimedia quorum-based (MQB) protocol to synchronize multiple...
Peer-to-peer (P2P) systems are in nature fully distributed with no centralized coordinator and objects are autonomously distributed to peers in P2P overlay networks. An acquaintance might hold obsolete, even incorrect information on objects due to the propagation delay of changed information on the objects and faults of peers. Hence, a peer has to collect correct object information only from trustworthy...
Each peer has to obtain information on objects distributed in networks by itself through communicating with its acquaintance peers. An acquaintance might hold obsolete, even incorrect information on objects due to the propagation delay of changed information on the object and faults of peers. It is critical to discuss how a peer can trust acquaintances. We discuss subjective and objective types of...
Systems using peer-to-peer (P2P) overlay networks are getting a central position in information systems. P2P systems are in nature fully distributed, with no centralized coordinator and each peer is autonomous. Each peer has to obtain information on resource objects like databases distributed in networks by itself through communicating with its acquaintance peers. Since the P2P system is scalable,...
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