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Frequency Points Allocation Algorithm in Cluster-Based sensor Network

Frequency Points Allocation Algorithm in Cluster-Based Senso...

引用

international conference on Wireless Communications, Networking and Mobile computing (WiCom)

作者： Jun Yi Weiren Shi Lei Xu Department of Automation Chongqing University Chongqing China

Characteristics of wireless sensor network are mainly featured in three aspects such as numerous nodes and large-scale networks and restricted operation ability. A frequency points allocation algorithm is proposed in order to decrease collision probability with increasing traffic load in this paper. Based on the coloring, nodes with different frequency points in different cluster can communicate with each other to reduce collision probability and avoid disturbance among clusters, especially for hidden-terminal problem by distributed control mode and power control. Test results of frequency points allocation in three power of ZigBee 2.4G show that it can reach the designed goal and costs less.

关键词： Radio spectrum management Clustering algorithms Road accidents sensor phenomena and characterization Wireless sensor networks Large-scale systems Telecommunication traffic Frequency distributed control Power control

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Almost Optimal distributed M2M Multicasting in Wireless Mesh Networks

Almost Optimal Distributed M2M Multicasting in Wireless Mesh...

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6th international conference on Mobile Adhoc and sensor systems

作者： Xin, Qin Manne, Fredrik Zhang, Yan Wang, Jianping Zheng, Zeyu Simula Res Lab Oslo Norway Univ Bergen Dept Informat Bergen Norway City Univ Hong Kong Dept Comp Sci Hong Kong Peoples R China

ISBN: (纸本)9781424451142

Wireless Mesh Network (WMN) is an emerging communication paradigm to enable resilient, cost-efficient and reliable services for the future-generation wireless networks. In this paper, we study the problem of multipoint-to-multipoint (M2M) multicasting in a WMN which aims to use the minimum number of time slots to exchange messages among a group of k mesh nodes in a multi-hop WMN with n mesh nodes. We study the M2M multicasting problem in a distributed environment where each participant only knows that there are k participants and it does not know who are other k - 1 participants among n mesh nodes. It is known that the computation of an optimal M2M multicasting schedule is NP-hard. We present a fully distributed deterministic algorithm for such an M2M multicasting problem and analyze its time complexity. We show that if the maximum hop distance between any two out of the k participants is d, then the studied M2M multicasting problem can be solved in time O(d log(2) n + k log(3) n/log k) with a polynomial-time computation, which is an almost optimal scheme due to the lower bound Omega(d + k log n/log k) given in [5]. Our algorithm also improves the currently test known result with running time O(d log(2) n + k log(4) n) in [13]. In this paper, we also propose a distributed deterministic algorithm which accomplishes the M2M multicasting in time O(d + k) with a polynomial-time computation in unit disk graphs. this is an asymptotically optimal algorithm in the sense that there exists a WMN topology, e.g., a line, a ring, a star or a complete graph, in which the M2M multicasting cannot be completed in less than Omega(d + k) units of time.

关键词： Broadcasting distributed Algorithms Gossiping Multicast Unit Disk Graphs Wireless Mesh Networks

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An energy efficient concentric clustering scheme in wireless sensor networks

An energy efficient concentric clustering scheme in wireless...

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NCM 2009 - 5th international Joint conference on Int. Conf. on Networked computing, Int. Conf. on Advanced Information Management and Service, and Int. Conf. on Digital Content, Multimedia Technology and its Applications

作者： Park, Min-Woo Choi, Jin-Young Han, Young-Ju Chung, Tai-Myoung Internet Management Technology Laboratory Electrical and Computer Engineering Sungkyunkwan University 300 Cheoncheon-dong Jangan-gu Suwon-si Gyeonggi-do 440-746 Korea Republic of

ISBN: (纸本)9780769537696

In wireless sensor networks, sensor nodes have limited power so the lifetime of the networks is very important design factor. the chain-based routing scheme is one of the famous routing schemes that are proposed for reducing energy dissipation of communication in the networks. the chain-based routing schemes construct the chains for routing path. the chain-based routing schemes can reduce energy dissipation of transmitting data to base station by using the concept of multi-hop routing. PEGASIS, concentric-clustering routing scheme, and extended concentric-clustering routing scheme belong to the chainbased routing schemes. PEGASIS and concentric-clustering routing scheme do not balance energy dissipation among the sensor nodes. Especially the extended concentric-clustering routing scheme can distribute energy dissipation among each cluster. the extended concentric-clustering routing scheme fixes the number of sensor nodes in each cluster for balancing of energy dissipation among each cluster. therefore the extended concentric-clustering routing scheme is able to make lifetime of the networks longer than the other chain-based routing schemes. However the extended concentric-clustering routing scheme still has limitation. this scheme cannot distribute energy dissipation. this difference is occurred by difference among transmitting data size of each cluster head. Because of this difference, energy dissipations are unbalanced and lifetime of the sensor networks is reduced. To overcome these problems, we propose an energy efficient concentric-clustering scheme. In our scheme, the number of sensor nodes is differently deployed to balance energy dissipation. As the simulation results, our scheme can distribute energy dissipation among the whole networks better than the extended concentricclustering routing scheme. © 2009 ieee.

关键词： Chains

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CAWA: Continuous Approximate Where-About Queries

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4th international ICST conference - INFOSCALE 2009

作者： Aved, Alexander Hua, Kien A. Petkova, Antoniya Sch EECS Orlando FL USA

ISBN: (纸本)9783642104848

With the current proliferation of wireless networks and mobile device technologies, the management of moving object databases to facilitate queries over these domains has been extensively studied. While current systems are concerned with tracing the precise location, or paths, of these objects, in many cases it is sufficient to know that the approximate location or path of a moving object is, with certainty, within known bounds. thus, we present our work on Continuous Approximate Where-About (CAWA) queries, in which mobile sensors sense the presence of an object (not its precise location) and query servers deduce the object's where-about area from mobile sensor presence updates.

关键词： Moving object database continuous query presence distributed computing where-about

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Low-Power, Intelligent sensor Hardware Interface for Medical Data Preprocessing

Low-Power, Intelligent Sensor Hardware Interface for Medical...

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5th ieee international Special Topic conference on Information Technology in Biomedicine

作者： Hu, Fei Lakdawala, Shruti Hao, Qi Qiu, Meikang Univ Alabama Dept Elect & Comp Engn Tuscaloosa AL 35487 USA Univ Rochester Dept Comp Engn Rochester NY 14627 USA Univ New Orleans Dept Elect & Comp Engn New Orleans LA 70148 USA

this work proposes an interface design of a low-power programmable system on chip for intelligent wireless sensor nodes to reduce the overall power consumption of the heart disease monitoring system, by lending them the capability of processing complex functions and performing rapid computations on a large amount of data at the node. this facilitates the node to intelligently monitor a medical signal for impending events instead of transmitting the signal to the base station constantly. Lowering the transmission data rate decreases the transmission power consumption in a node, thereby lengthening the node life and in turn increasing the reliability of the network. this work also implements a thresholding technique, which controls the data transmission rate depending on the value of the monitored signal, and a cardiac monitoring system that performs computations at the node for the detection of either a skipped heart beat or a reduced heart rate variability, in which event the signal is transmitted to the base station for monitoring/recording or alerting the crew. the performance analysis of the system shows that there are reductions in the system power consumption and data transmission rate, which in turn reduces the network traffic and averts congestion.

关键词： Biomedicine energy-efficiency hardware interface sensor hardware design wireless sensor networks

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An Adapting Random Walk for Ad Hoc and sensor Networks

An Adapting Random Walk for Ad Hoc and Sensor Networks

引用

international conference on distributed computing systems Workshop

作者： Adnan Noor Mian Roberto Baldoni Roberto Beraldi DIS University of Roma La Sapienza Rome Italy

In this paper we propose an adaptive random walk for wireless networks. the lifetime of the walk is varied in such a way that at least a given fraction of nodes is covered, in expectation. the only parameter of the random walk, alpha, depends on the nominal network size N and on the required coverage. For sizes lower than N the required coverage is satisfied with lifetime slightly higher than the optimal one. the paper reports performance results obtained through analytical study backed up with simulations.

关键词： Wireless sensor networks Routing Temperature sensors distributed computing conferences sensor systems Performance analysis Analytical models Clustering algorithms Wireless networks

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Data Fusion Algorithm Based on Event-Driven and Minimum Delay Aggregation Path in Wireless sensor Network

Data Fusion Algorithm Based on Event-Driven and Minimum Dela...

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5th international conference on Intelligent computing

作者： Xu, Tianwei Yuan, Lingyun Niu, Ben Yunnan Normal Univ Coll Comp Sci & Informat Technol Kunming Yunnan Peoples R China Shenzhen Univ Coll Management Shenzhen Peoples R China

ISBN: (纸本)9783642040191

Emergent event detection is one of the most important applications in event-driven wireless sensor network. In order to save energy, a dynamic clustering routing algorithm based on event severity degree is presented rather than period monitoring in the paper. the lifetime and the scale of clusters lie on the emergent event severity degree. On the other hand, the data must be collected, fused and transmitted in real time for the emergencies. Most existing data aggregation methods in wireless sensor networks just have longer network delay. the minimal delay aggregation path mechanism is put forward to reduce the network delay. the hop-count from itself to its cluster head and the degree determine the waiting time for a fusing node. With every waiting time for the fusing nodes in the path, the minimal delay aggregation path can be obtained. the simulation results show that our algorithm can save energy efficiently, and reduce the network delay remarkably. It achieved a better tradeoff between the energy and delay. Moreover, it provides a good method for wireless sensor network applied to monitoring emergencies.

关键词： Wireless sensor Network Data Fusion Event Driven Minimum Delay Aggregation Path

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A distributed Node Localization Algorithm Based on Believable Factor for Wireless sensor Network

A Distributed Node Localization Algorithm Based on Believabl...

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international conference on Wireless Communications, Networking and Mobile computing (WiCom)

作者： Yuanhua He Hongsheng Li Sch. of Autom. Wuhan Univ. of Technol. Wuhan China

Wireless sensor network has a wide range of applications in the fields of national defense, industry and agriculture, environmental monitoring and so on. the localization of sensor nodes is the basis of these applications. A new localization algorithm (wbf-Euclidean) is proposed in this paper, which is based on Euclidean algorithm. this algorithm utilizes iterative approach to increase localization coverage and sets believable factor threshold to avoid using nodes' outlier information. In addition, it uses combination trilateration method to obtain the set of coordinate estimates and then calculate the weighted mean to improve localization accuracy. Simulation results show that it is efficient to prevent large localization errors from spreading through the networks, and it is fit for the large scale sensor networks.

关键词： Wireless sensor networks Iterative algorithms Automated highways Iterative methods Large-scale systems Helium Automation Defense industry Agriculture Computerized monitoring

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An Effective Edge-Adaptive Color Demosaicking Algorithm for Single sensor Digital Camera Images

An Effective Edge-Adaptive Color Demosaicking Algorithm for ...

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5th international conference on Intelligent computing

作者： Hossain, Md. Foisal Alsharif, Mohammad Reza Yamashita, Katsumi Univ Ryukyus Dept Informat Engn Okinawa Japan Osaka Prefecture Univ Grad Sch Engn Osaka Japan

ISBN: (纸本)9783642040696

Most digital cameras use a color filter array of mosaic pattern to capture the colors of the scene. To render a full-resolution color image using a single-chip camera, the missing information must be estimated from the surrounding pixels. In this paper, we present an edge-adaptive demosaicking method for color demosaicking. the algorithm first estimate missing green samples in red and blue position by determining direction of edge in horizontal, vertical and diagonal directions. After determining the green samples, missing red and blue samples estimated using color differences along the direction of edges. Experimental results demonstrate that the proposed method produces visually pleasing images and significantly outperforms existing demosaicking methods in terms peak signal-to-noise ratio (PSNR) and Delta E-ab, which is a measure for the average color distance between original and demosaicked images in the CIELAB color space.

关键词： Color demosaicking Bayer color filter array Edge-adaptive demosaicking Diagonal edge direction PSNR

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A Real-Time Monitoring and Controlling System for Grain Storage with ZigBee sensor Network

A Real-Time Monitoring and Controlling System for Grain Stor...

引用

international conference on Wireless Communications, Networking and Mobile computing (WiCom)

作者： Huiling Zhou Fengying Zhang Jingyun Liu Fenghui Zhang Automation School Beijing University of Posts and Telecommunications Beijing China

the purpose of this study is to develop and test a real-time monitoring and controlling system for grain storage. Because ZigBee/ieee802.15.4 indicates a network system which is highly reliable, cost-effective, low power consumption, programmable and fast establishing, we use ZigBee technology into this system for industry and research applications. the system developed in this application includes a host computer and a data management and control system based on LabWindows/CVI, a ZigBee sensor network. In addition to describing the system architecture, hardware and software, the paper also reports on the performance of the transmission distance of ZigBee wireless node in grain and the node lifetime estimation.

关键词： Real time systems Control systems ZigBee sensor systems Power system reliability Application software System testing Computerized monitoring Computer network reliability Energy consumption

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