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There are main six factors controlling failure zone floor depth including mining depth, coal seam inclination angle, mining thickness, workface inclined length, coal floor anti-destructive capacity, fault or fracture zone. Inorder to prediet failure depth of coal seam floor, based on the analysis of the factors influencing the failure depth of coal seam floor, a model to predict the failure depth...
This paper proposes a distributed energy-efficient routing algorithm for mobile Ad Hoc networks (MANETs). We adopt the cross-layer design paradigm. The distance from the source node to the destination node is estimated based on the received signal strength indication (RSSI) of the packets and is used to adaptively adjust the backoff time of the MAC layer. A distance threshold and a packet count threshold...
This paper researches on knowledge retrieval, reuse and innovation in product conceptual design. First, userpsilas design requirement is translated and decomposed using function-method tree. Second, design case and constraint are used to describe a two-layer process of knowledge retrieval. One is to get the similarity of case function through matching function unitspsila attribute values that is weighted...
Wireless sensor localization has become an essential requirement for realistic applications over wireless sensor networks (WSNs). Although some other systems have been proposed, these methods normally require heavy computational processes to overcome the presence of these errors. Because coarse accuracy is sufficient for most sensor network applications, a method for estimating unknown node positions...
In mobile ad hoc & sensor networks, power control is an efficient way to improve the efficiency of energy. However, it will also produce negative influence on many aspects of the networks such as the network connectivity, delay and network capacity. In this paper, proposed related energy control mechanisms for ad hoc & sensor networks are introduced. Considering the QoS requirement such as...
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