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Exposure-path prevention in directional sensor networks using sector model based percolation

Exposure-path prevention in directional sensor networks usin...

引用

2009 IEEE International Conference on Communications, ICC 2009

作者： Liang, Liu Xi, Zhang Huadong, Ma Networking and Information Systems Laboratory Department of Electrical and Computer Engineering Texas A and M University College Station TX 77843 United States Beijing Key Lab. of Intelligent Telecomm. Software and Multimedia Beijing University of Posts and Telecomm. Beijing 100876 China

ISBN: (纸本)9781424434350

In wireless sensor networks, most existing works on region coverage mainly concentrate on the omnidirectional sensor based full coverage, which ensures that all points in the sensor-deployed region are covered. In contrast, this paper studies the problem of exposure-path prevention for the region coverage in directional sensor networks. Because the exposure paths are prevented as long as no moving objects or phenomena can go through a sensor-deployed region without being detected, exposure-path prevention does not require full coverage, and instead it only needs the partial coverage. Towards this end, we apply the percolation theory to solve the exposure path problem for directional sensor networks. In particular, we map the exposure path problem into a sector based percolation model, and then derive the bounds of critical density where directional sensors are deployed according to a 2-dimensional Poisson process. Also conducted is a set of extensive simulations to validate and evaluate our developed models and schemes. ©2009 IEEE.

关键词： Wireless sensor networks

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Minimal exposure path algorithms for directional sensor networks

Minimal exposure path algorithms for directional sensor netw...

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2009 IEEE Global Telecommunications Conference, GLOBECOM 2009

作者： Liu, Liang Zhang, Xi Ma, Huadong Networking and Information Systems Laboratory Department of Electrical and Computer Engineering Texas A and M University College Station TX 77843 United States Beijing Key Lab. of Intelligent Telecomm. Software and Multimedia Beijing University of Posts and Telecomm. Beijing 100876 China

ISBN: (纸本)9781424441488

As a fundamental problem of wireless sensor networks, the minimal exposure path problem corresponding to the sensor network's worst-case coverage plays an important role in the applications for detecting intrusions. However, most existing works about minimal exposure path are based on omnidirectional sensors. In contrast, this paper studies the minimal exposure path problem for directional sensor networks. We first develop a directional sensing model: directional sensitivity model. Then, we formulate the minimal exposure path problem by using two sensing intensity functions: all-sensor intensity function and maximum-sensor intensity function, and generate two weighted grids to convert the minimal exposure path problem into two discrete geometric problems. Based on the above weighted grids, we also develop two approximation algorithms to find the minimal exposure path for the directional sensitive model. We conduct extensive simulations to validate and evaluate our proposed models and algorithms.

关键词： Wireless sensor networks

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Integration of Routing and Switching in Delay-Disruption Tolerance Network

Integration of Routing and Switching in Delay-Disruption Tol...

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International Conference on Mobile Ad-hoc and Sensor Networks, MSN

作者： Yang Li Qian He Xiumei Fan Beijing Key Laboratory of Intelligent Information School of Computer Science and Technology BIT Beijing China School of Software Engineering BIT Beijing China

In virtue of its widespread application scenarios, especially in battlefield communication, disaster rescue, satellite and deep-space transmission, Delay-disruption Tolerant Network (hereinafter referred to as DTN) has become one of the most attractive focuses in research for future Internet. Due to the intermittent connectivity, mobility of nodes, signal interference, jamming in DTN, there exist substantive uncertainty which will cause potential security hazard and degradation of performance (including average latency, delivery ratio, etc.). So there are challenges in security and reliability for DTN. In our paper, from the perspective of the uncertainty reduction in DTN, we propose a routing strategy of multi-hop forwarding based on potential energy hierarchy. We also introduce the concept of integration of routing & switching, and propose a multi-port switching fabric to schedule data in accordance with the multi-hop routing. In terms of theory, entropy demonstrate this strategy can provide the dependability and stability of security routing in DTN.

关键词： Routing Disruption tolerant networking Uncertainty Data security Communication switching Artificial satellites IP networks Interference Jamming Hazards

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Dynamic dictionary design for SIP signaling compression

Dynamic dictionary design for SIP signaling compression

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2009 WRI World Congress on Computer Science and Information engineering, CSIE 2009

作者： Weihai, Li Yan, Ma Qing, Ma Xiaohong, Huang State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications 100876 Beijing China Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia Beijing University of Posts and Telecommunications 100876 Beijing China Network Technology Research Institute Beijing University of Posts and Telecommunications 100876 Beijing China School of Electronic Engineering Beijing University of Posts and Telecommunications 100876 Beijing China

ISBN: (纸本)9780769535074

A new SIP signaling compression solution based on structured dynamic dictionary is proposed in this paper. A SIP compression mechanism based on dynamic-dictionary is designed for improving SIP signaling compression combined with LZSS algorithm. The new mechanism reduces the time complexity of compression algorithm and makes the use of memory more effective. © 2008 IEEE.

关键词： Dynamics

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Removal of Baseline Wander from Dynamic Electrocardiogram Signals

Removal of Baseline Wander from Dynamic Electrocardiogram Si...

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Congress on Image and Signal Processing, CISP

作者： Min Dai Shi-Liu Lian Tianjin Key Laboratory of Intelligent Computing & Novel Software Technology School of Computer and Communication Engineering Key Laboratory of Computer Vision and System Ministry of Education School of Computer and Communication Engineering Tianjin University of Technology Tianjin China

The traditional method based on moving average filter can remove the baseline wander in electrocardiogram signals, but also causes the loss of motive ECG signals, which makes distortions of filtered ECG signals. In this paper, a modified moving average filter is proposed to selectively capture the low-frequency baseline wander noise and remove it from the detected signals in order to recover true ECG. The interval sampling data is taken into consideration when calculate the moving average in order to reduce the loss of useful ECG signals and distortions. The algorithm is developed for computer implementation using MATLAB. To validate the proposed methods, the recording from MIT/BIH database is used. Experimental results demonstrate the improvement of the proposed moving average filter over the traditional one in removing baseline wander without introducing distortion to the ECG signals.

关键词： Electrocardiography Frequency Distortion Finite impulse response filter IIR filters Computer vision Clinical diagnosis Electrodes Adaptive filters Low-frequency noise

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A Unique Multi-functional Landmark for Autonomous Navigation

A Unique Multi-functional Landmark for Autonomous Navigation

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International Conference on Natural Computation (ICNC)

作者： Dan Wang Yunwei Jia Zuoliang Cao Tianjin Key Laboratory of Intelligent Computing & Novel Software Technology Key Laboratory of Computer Vision and System Ministry of Education Tianjin University of Technology China School of Mechanical Engineering Tianjin University of Technology China

ISBN: (纸本)9781424445424

To save time, improve flexibility and guarantee accuracy of the navigation system of the mobile robots, a multi-function landmark and a new navigation algorithm are proposed in this paper. With the new algorithm and landmark the mobile robots can be located by only a single landmark, and can be navigated in a large area by serial landmarks. The simple configuration and the convenient material of the landmark increased the system's flexibility and decreased the complexity of the algorithm. From the experimental results it can be concluded that the navigation system has fast navigation speed and high navigation accuracy.

关键词： Navigation Mobile robots Robot kinematics Computer vision Educational technology Algorithm design and analysis Shape intelligent robots Laboratories Mechanical engineering

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A new approach for DCT coefficients estimation and super resolution of compressed video

A new approach for DCT coefficients estimation and super res...

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Pacific-Asia Workshop on Computational Intelligence and Industrial Application, PACIIA

作者： Tao Lu Chengdong Lan Lingyan Lu National Engineering Research Center of Multimedia Software Wuhan University of China Wuhan China Hubei Province Key Laboratory of Intelligent Robot College of Computer Science and Engineering Wuhan Institute of Technology Wuhan China

Reconstructing high resolution images from compressed low resolution video is a hot issue now. In many real applications, such as surveillance users often only get low quality videos which are hard to identify interested objects, super resolution restoration is a effective tool to enhance the quality of images. Quantization loss is the major cause for losing images details, this paper propose an new method to estimate the quantization noise in frequency domain using Laplace model for DCT coefficients, then the distribution parameter of Laplace is treated as variable simultaneously iterated with the object high resolution images. Experiments indicate that this algorithm in compressed video restoration details due to quantization noise have better performance than others.

关键词： Discrete cosine transforms Video compression Image resolution Image coding Quantization Image restoration Image reconstruction Surveillance Frequency estimation Frequency domain analysis

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Minimal Exposure Path Algorithms for Directional Sensor Networks

Minimal Exposure Path Algorithms for Directional Sensor Netw...

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GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

作者： Liang Liu Xi Zhang Huadong Ma Beijing Key Laboratory of Intelligent Telecommunication Software and Multimedia Beijing University of Posts and Telecommunications Beijing China Networking and Information Systems Laboratory Department of Electrical and Computer Engineering Texas A and M University College Station TX USA

关键词： Wireless sensor networks intelligent sensors Intrusion detection Telecommunications Mesh generation Approximation algorithms Sensor systems Information systems Laboratories intelligent networks

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A Coverage-Enhancing Method for 3D Directional Sensor Networks

A Coverage-Enhancing Method for 3D Directional Sensor Networ...

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IEEE Annual Joint Conference: INFOCOM, IEEE Computer and Communications Societies

作者： H. Ma X. Zhang A. Ming Beijing Key Laboratory of Intelligent Telecommunication Software and Multimedia Beijing University of Posts and Telecommunications Beijing China Networking and Information Systems Laboratory Department of Electrical and Computer Engineering Texas A and M University College Station TX USA

ISBN: (纸本)9781424435128

In conventional directional sensor networks, coverage control for each sensor is based on a 2D directional sensing model. However, 2D directional sensing model cannot accurately characterize the actual application scene of image/video sensor networks. To remedy this deficiency, we propose a 3D directional sensor coverage-control model with tunable orientations. In order to improve the efficiency of target-detecting, we develop a virtual potential-field based coverage-enhancing scheme to improve the coverage performance. Furthermore, we apply the simulated annealing algorithm for objective optimization. The extensive simulations show the effectiveness of our proposed 3D sensing model and coverage enhancing method.

关键词： Sensor phenomena and characterization intelligent sensors Image sensors Layout Simulated annealing Sensor systems Communications Society intelligent networks Telecommunications Multimedia systems

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Dynamic Node Collaboration for Mobile Target Tracking in Wireless Camera Sensor Networks

Dynamic Node Collaboration for Mobile Target Tracking in Wir...

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IEEE Annual Joint Conference: INFOCOM, IEEE Computer and Communications Societies

作者： L. Liu X. Zhang H. Ma Beijing Key Laboratory of Intelligent Telecommunication Software and Multimedia Beijing University of Posts and Telecommunications Beijing China Networking and Information System Laboratory Department of Electrical and Computer Engineering Texas A and M University College Station TX USA

ISBN: (纸本)9781424435128

Compared to the other types of sensor networks, the wireless camera sensor networks can offer much more comprehensive and accurate information in mobile target tracking applications. We propose a dynamic node collaboration scheme for mobile target tracking in wireless camera sensor networks. Unlike the traditional sensing models, we develop a nonlinear localization-oriented sensing model for camera sensors by taking the perspective projection and the observation noises into account. Based on our sensing model, we apply the sequential Monte Carlo (SMC) technique to estimate the belief state of the target location. In order to implement the SMC based tracking mechanism efficiently, we propose a dynamic node collaboration scheme, which can balance the tradeoff between the quality of tracking and the network cost. Our scheme deploys the dynamic cluster architecture which mainly includes the following two components. First, we design a scheme to elect the cluster heads during the tracking process. Second, we develop an optimization-based algorithm to select an optimal subset of camera sensors as the cluster members for estimating the target location cooperatively. Also conducted is a set of extensive simulations to validate and evaluate our proposed schemes.

关键词： Wireless sensor networks Collaboration Target tracking Cameras intelligent sensors Vehicle dynamics Peer to peer computing Image sensors Sensor phenomena and characterization Sliding mode control

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