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Multihop communication mechanism has been widely employed in wireless sensor networks (WSNs) for its practicability and high energy efficiency. However, hot spots emerge as locations, in which nodes die quickly because of heavy relay load, leading to disruption in network service. Balancing energy consumption of nodes so as to mitigate the hot spot issue in the network is very important for prolonging...
This paper describes a grey-modeling method for small-scale unmanned helicopter that combines the advantages of first-principles modeling and system identification. First, a structure of the attitude model at hovering is developed by strict mechanism derivation and the unknown structural parameters are got. Then, a flying experiment was implemented to get the input and output data. Next, a method...
Standardization is a basic principle to design the relational database, which guarantees the revision of data structure and the quality of reorganization, but when referring to data mining system, anti-standardization is needed for data warehouse design. This paper discusses the necessity of anti-standardization and the specific design methods. With the development of data mining application, the...
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