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Precision irrigation is an important practice in water-saving agriculture cropping system, which allows producers to maximize their productivity while saving water. While the accurate irrigation amount is difficult to obtain as the impact factor was too much. In order to solve this problem, a fuzzy decision-making method of irrigation amount based on ET and soil water potential was designed in this...
DV-hop algorithm is analyzed in this paper, and then a kind of improved algorithm is proposed based on the errors of estimating average per hop distance and calculating unknown node location by multilateral law. When calculating average per hop distance, it should combine overall average per hop distance and average per hop distance of original DV-hop algorithm. When locating unknown node, it should...
Self-positioning of sensor nodes is one of the important research in the wireless sensor networks. APIT is a major non-ranging-based localization algorithm. Relative to other non-Ranging-based Localization Algorithm, APIT has a high positioning accuracy, communication overhead, and so on. However, APIT algorithms require higher density neighbor anchor node, For those neighbors around the anchor nodes,...
TinyOS is an open source operating system for wireless sensor networks developed by the University of California at Berkeley, aimed at the character of sensor network. In TinyOS environment, the system not only provides a powerful simulation tool to ensure the accuracy of the system, the system also provides a series of tools to simplify the development of the system, using these tools can greatly...
A new key management protocol for wireless sensor network was put forward based on one-way key chain, which could afford deterministic security and could reduce the storage cost compared with existing typical pre-distribution protocols. This protocol could distribute, evict and renew the cluster-key by one-time local broadcasting based on the difficulty of factorization of polynomial, and resolve...
With a variety of attacks, this paper proposes a novel solution which requires establishing a trust among all nodes in mobile sensor networks and develops a material scheme which can achieve the goal. The scheme includes a mechanism to establish a trusted relation between all neighboring nodes and avoid untrustworthy nodes during the route discovery process. And it can resist DoS-style flooding attacks...
The paper introduces a method of Embedded Wireless Video monitoring System based on GPRS (General Packet Radio Service). First the S3C2410 platform is given based on the Embedded Linux, and the develop software environment on the platform. And then describe how to achieve the image collection on the platform, introduce the program of video capture, accomplish the JPEG (Joint Photographic Experts Group)...
There are a large number of papers on security in ad hoc networks, only a few consider sensor networks. And those works on WSN mainly discuss the problem about key management. The main purposes of this work are to establish a trust on the neighbor relation in WSN and propose a solution of achieving the goal. Our solution includes a mechanism to establish a trusted relation between all neighboring...
With the fast development of the micro-electro- mechanical systems (MEMS), wireless sensor networks (WSN) have been extensively studied. Most of the studies focused on saving energy because of restricted energy supply in the WSN. Cluster-based routing is commonly considered as one of the most energy-efficient approaches. However, it is not always so efficient especially when there are a small number...
In this paper, an improved subspace approach based on range measurement is proposed and analyzed. Through the factorization of multidimensional similarity (MDS) matrix, we derive a novel kernel subspace to estimate the coordinate of unknown mobile node in wireless sensor networks (WSN). Simulation results are included to contrast the estimator performance with general subspace method, and the performance...
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