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The wireless ad-hoc networks do not rely on any infrastructure, which comes at the cost of finite and usually unreplenishable power supplies. It has been an area of intense research how to perform effectively maximum lifetime multicast delivery. This paper presents a new method for this problem, called the Directional Reception Two-step Reconstruction (DRTR). Firstly, based on conventional ad-hoc...
Traffic anomalies are abnormal changes in network traffic. There are many causes of resulting in traffic anomaly changes, including network fault, abuse, network attack and so on. This paper proposes a novel method for detecting traffic anomalies in a network. Firstly, all Origin-Destination (OD) flows in the network are grouped with accordance with common destination nodes. We then make time-frequency...
This paper investigates the global optimal multicast routing in the cognitive ad hoc networks, which is based on the directional antenna model. By analyzing directional antenna model and based on the end-to-end performance parameters, a multicast routing algorithm, which is to obtain the global optimal performance and refers to the energy utilization as metric, is proposed. Simulation results show...
Origin-Destination (OD) traffic anomalies reflect network-level traffic anomaly behaviors, which is significantly dangerous to network operation. OD traffic anomalies in a network are investigated in this paper, using statistical analysis based on principle component analysis (PCA). Firstly, we use PCA method to analyze network traffic characteristics and to divide OD flows in the network into both...
This paper present a convenient method for estimating the trifocal tensor corresponding to three images acquired by 3 cameras and 10-15 point projecting devices. A set of virtual 3D points are made by the laser pointers which are projected onto the working volume by turns. Its images are corresponding points naturally, found with sub-pixel precision. Then the trifocal tensor is computed via rank-4...
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