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compressing Information of Target Tracking in Wireless Sensor Networks

Wireless Sensor Network 2011年第2期3卷 73-81页

作者： Jianzhong Li Qianqian Ren 不详

Target tracking is a well studied topic in wireless sensor networks. It is a procedure that nodes in the network collaborate in detecting targets and transmitting their information to the base-station continuously, which leads to data implosion and redundancy. To reduce traffic load of the network, a data compressing based target tracking protocol is proposed in this work. It first incorporates a clustering based data gather method to group sensor nodes into clusters. Then a novel threshold technique with bounded error is proposed to exploit the spatial correlation of sensed data and compress the data in the same cluster. Finally, the compact data presentations are transmitted to the base-station for targets localization. We evaluate our approach with a comprehensive set of simulations. It can be concluded that the proposed method yields excellent performance in energy savings and tracking quality.

关键词： Wireless Sensor Networks Target tracking compressing

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Structural framework and its evolution in Chasang area of Qiangtang Basin in northern Tibetan

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Science China Earth Sciences 2001年第S1期44卷 18-26页

作者：刘池洋杨兴科任战利赖绍聪陈刚赵红格魏永佩郑孟林王成善 Northwest Univ Inst Oil & Gas Basin Xian 710069 Peoples R China Chengdu Univ Technol Inst Sedimentary Geol Chengdu 610059 Peoples R China

Through comprehensive research on the various geophysical and geological data acquired recently, we consider that the Chasang area in the western uplift of Qiangtang is a huge south-dipping block which is overlapped by several east-west trending blocks rather than a simple and palaeo-doming existing for a long time. The structural and geophysical features of the area, which only alone limited between Shuanghu and Rongma districts, are of no regional significance. Their development is closely related with the approximately south-north trending transform faults developed during the Mesozoic era on the east and west sides of the area and their later continuous movement. The compressing, overlapping and uplifting of the Chasang area began at the stage of reversing of the Qiangtang Basin during the Lower Cretaceous, which is in direct relation with Bangonghu-Dingqing limited ocean's closure and the convergence of the neighboring blocks. The compression and overlapping of the area have further developed and reformed

关键词： Qinghai-Tibetan Plateau Qiangtang basin Chasang area structure framework compressing and shortening napping and overlapping transverse transform fault.

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一种压缩XML数据仓库的存储策略

一种压缩XML数据仓库的存储策略

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第十九届全国数据库学术会议

作者：王宏志李建中何震瀛哈尔滨工业大学计算机科学与工程系

1.引言随着Internet的迅速发展,XML在计算机领域得到了广泛的应用,海量的XML文档存储中,一个导致数据冗余的原因是存在着大量的重复数据,而这种重复常常是不能简单地作为一般的冗余数据

关键词： XML warehouse Storage compressing Cluster

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