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After wormhole attacks the routing mechanism of wireless sensor network (WSN) is damaged, then the hop count and distance between nodes cannot be well matched, so that the WSN becomes the anisotropic sensor network, resulting in security treats for WSN. Considering that wormhole attacks can cause the changing of node connectivity, through the theoretical analysis and derivation, the paper has proposed...
Node localization plays a key role in the validity of WSN applications. To improve the precision of WSN node localization, A localization algorithm is studied which is based on Maximum Likelihood Estimation (MLE). A new RSSI ranging model is proposed that is depicted by two empirical models. The optimal number of reference WSN nodes for localization are studied. The test results show that the error...
This paper aims at improving the throughput of the wireless sensor networks (WSNs), particularly to overcome the so-called funneling effect for WSNs with converge-cast patterns. Due to the disproportionate larger number of packets accumulated in the sensors that are closer to the sink, there is a need to decrease the collisions and increase the throughput around the sink area as well as the nodes...
Due to lacking capability of simultaneously gathering information from the embedded system devices and networks, neither WSN simulators nor testbeds could explain how an abnormal exception in the embedded system would influence the network behaviors, and how the network congestion may possibly damage the health of the system on a single node. In this paper, to observe the WSN behavior from both network...
Node localization plays a critical role in wireless sensor network (WSN). The ill-posed problem caused by measurement error in the localization brings down the localization precision. Based on the Landweber iteration principle, a new multilateral localization algorithm is proposed, which includes the optimal reference node number, the iteration index selecting, termination rules and the accelerated...
Focus on anti-monitoring problem of the mobile object in sensory fields, a novel dynamic heuristic anti-monitoring path searching algorithm in sensory field by combining prior property of eight-neighbor quadratic cell and A* algorithm is designed. Theoretical analyses and experimental results show that, compared with conventional works, the new algorithm has better anti-monitoring performance which...
Zigbee-compliant wireless sensor network (WSN) platforms using TI CC2430 or CC2431 chipsets with Z-stack were widely used in hospitals, sanatoriums and other public applications. In this paper, we created a wireless healthcare monitoring platform, and then evaluated two key performance-related issues in regard to this platform, i.e. the radio transmission issue and the radio localization issue. Experimental...
The applications of wireless sensor network in urban intelligent transportation system (ITS) were lucubrated, and an ARM9 SoC (system-on-chip) embedded sensor node was developed for urban traffic information collection and data transmission and reception. Together with the appropriate software programmed and intelligent control model for the urban traffic system built, the real time traffic data could...
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