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H-cluster: A novel efficient algorithm for data clustering in sensor networks

Journal of Communications 2011年第2期6卷 168-178页

作者： Guo, Longjiang Ren, Meirui Li, Jinbao Liu, Yong Ai, Chunyu School of Computer Science and Technology Heilongjiang University Harbin 150080 China Key Laboratory of Database and Parallel Computing Heilongjiang Province Harbin 150080 China Computer Science Troy University Troy AL 36082 United States

This paper focuses on the problem of data clustering in wireless sensor networks (WSNs). The data time window is a landmark window, from the time WSN starts working up to the current time. The objective is to group sensory data generated by sensor nodes deployed in a two-dimensional physical space by the similarity of sensory data in the multi-dimensional sensory data space. To perform in-network data clustering efficiently, we propose HilbertMap, a novel dimensionality reduction technique based on the Hilbert Curves, to map a multi-dimensional data space to a two-dimensional physical space. Through this mapping, the communications for clustering mostly occur between geographically nearby sensor nodes. We have conducted simulation experiments on both real-world and synthetic datasets. Our results show that HilbertMap improves the communication efficiency while maintaining a good clustering quality. © 2011 ACADEMY PUBLISHER.

关键词： Sensor nodes

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keywords generation algorithm based on bipartite graph

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Tongxin Xuebao/Journal on Communications 2011年第9 A期32卷 146-152页

作者： Yang, Yan Zhu, Jing-Hua Jin, Hu Li, Wei Department of Computer Science and Technology Heilongjiang University Harbin 150080 China Key Laboratory of Database and Parallel Computing Heilongjiang University Harbin 150080 China

To improve the efficiency of keywords generation, a bipartite graph based keywords generation(BGKG) algorithm was proposed. It generated keywords based on search engine logs and built a bipartite graph between query terms and the clicked URLs. It took into account the rank of the URLs in result pages and the order of users' clicking. Experiments were done with real query logs. The results show that keywords generated by BGKG can satisfy the needs of enterprise clients and BGKG is more efficient than other keyword generation algorithms.

关键词： Search engines

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Cross-layer design for multi-power multi-radio wireless sensor networks

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Xitong Gongcheng Lilun yu Shijian/System Engineering Theory and Practice 2011年第SUPPL. 2期31卷 114-118页

作者： Guo, Xiao-Hang Li, Jin-Bao School of Computer Science and Technology Heilongjiang University Harbin 150080 China Key Laboratory of Database and Parallel Computing of Heilongjiang Province Harbin 150080 China

In this paper, we investigate on the optimal routing jointly scheduling, channel and power assignment in multi-power multi-radio WSNs. We first formulate the optimal routing as a linear programming problem, and then design a polynomial time heuristic algorithm. Experiments show that the proposed cross-layer routing significantly reduce the energy consumption and the end-to-end transmission delay.

关键词： Wireless sensor networks

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Anti-theft technology based on wireless sensor network

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Ruan Jian Xue Bao/Journal of Software 2011年第SUPPL. 1期22卷 111-121页

作者： Duan, Jin-Sheng Guo, Long-Jiang Liu, Yong Zhu, Jing-Hua Department of Computer Science and Technology Heilongjiang University Harbin 150080 China Key Laboratory of Database and Parallel Computing of Heilongjiang Province Harbin 150001 China

There are shortcomings in traditional anti-theft technology which can not satisfy a user's demand. The common ways of anti-theft are limited in wireless sensor networks. On the topic of the shadowing effect in wireless communication, this paper introduces a anti-theft technology based on wireless sensor networks. System can check intrusion by analyzing received signal strengths. This paper establishes a framework of anti-theft system and studies the key technologies. By defining the graph model in anti-theft system, the agent distribution problem is abstracted into edges partitioned by vertices problem. B-EPV algorithm is proposed for obtaining the optimal solution. Blade algorithm is designed for solving k-mode set problem to get steady status of link. This paper constructs experimental environment with real motes and verifies the performance of the system. The result shows low false positives and false negatives in the system. © Copyright 2011, Editorial Department of Journal of Software. All rights reserved.

关键词： Wireless sensor networks

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Research on physical conflict model based power allocation and link scheduling in MRMC wireless networks

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Xitong Gongcheng Lilun yu Shijian/System Engineering Theory and Practice 2011年第SUPPL. 2期31卷 101-104页

作者： Guo, Ya-Hong Wang, Xian School of Information Science and Technology Heilongjiang University Harbin 150080 China School of Computer Science and Technology Heilongjiang University Harbin 150080 China Key Laboratory of Database and Parallel Computing of Heilongjiang Province Harbin 150080 China

In order to improve the network spatial reuse and maximize the network throughput, this paper presents a physical conflict model based power allocation and link scheduling algorithm (PPLA). Firstly, PPLA picks available set of parallel links using hexagon coloring method. With physical conflict model, it further obtains the minimum power vector which corresponds to parallel links set. The experimental results indicate that the algorithm can increase network spatial reuse ratio and improve throughput significantly.

关键词： Throughput

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RETRACTED ARTICLE: Collaborative filtering based on time division

RETRACTED ARTICLE: Collaborative filtering based on time div...

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作者： Yang, Yan Yun, Long Department of Computer Science and Technology Key Laboratory of Database and Parallel Computing of Heilongjiang Province Heilongjiang University Harbin China

ISBN: (纸本)9781424455386

Collaborative filtering techniques are widely used in e-commerce systems. However, the rating data are very sparse, which affects prediction accuracy greatly. A time division based collaborative filtering algorithm is proposed in this paper. According to the current time and the released time of items, items are divided into three types, named new item, normal item and old item respectively. Accordingly, users' interests are calculated in the three types respectively and user-item matrix is expanded. When predicting the rate of an item for a user, different strategies are used with different types of items. Data sparsity and new item problems are solved effectively. Empirical studies on MovieLens have shown that our newly proposed method improve recommendation quality obviously. © 2010 IEEE.

关键词： Collaborative filtering

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Literature recommendation based on reference graph

Literature recommendation based on reference graph

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International Conference on Advanced Computer Theory and Engineering

作者： Yan, Yang Long, Yun Key Laboratory of Database and Parallel Computing of Heilongjiang Province Department of Computer Science and Technology Heilongjiang University Harbin China

ISBN: (纸本)9781424465408

Research papers are frequently requested in digital library. When users query for documents about a research problem, users usually want all the related documents and the citations with the relations among them, to enable the user know the development of the research area. Traditional recommendation techniques are mainly based on similarity among users or documents to do recommendation. They do not use the relationships among documents and, especially, cannot provide topology structure of related documents to the user. This paper proposes a new recommendation technique based on reference graph of documents. Combined with traditional recommendation techniques, it can recommend research paper more completely, accurately and clearly. Experimental results show that the reference graph based recommendation technique is more effective. © 2010 IEEE.

关键词： Digital libraries

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OMA: A multi-channel MAC protocol with opportunistic media access in wireless sensor networks

OMA: A multi-channel MAC protocol with opportunistic media a...

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International Conference on Mobile Ad-hoc and Sensor Networks

作者： Li, Jinbao Zhang, Desheng Guo, Longjiang School of Computer Science and Technology Heilongjiang University Harbin Heilongjiang 150080 China Key Laboratory of Database and Parallel Computing of Heilongjiang Province Harbin Heilongjiang 150080 China

ISBN: (纸本)9780769543154

To tackle control channel saturation problems, this paper proposes OMA, an asynchronous duty cycle based multi-channel MAC protocol with opportunistic media access for wireless sensor networks. By adopting opportunistic media access, OMA effectively alleviates, if not completely eliminates, control channel saturation problems. More importantly, OMA is fully distributed with no requirements of time synchronization or multi-radio. Therefore, OMA is very easy to be implemented in resource-constrained sensor nodes. Via the theoretical analysis, the opportunistic probability with which a node opportunistically access the control channel is obtained. To validate the effectiveness of opportunistic media access, extensive simulations and real testbed experiments were conducted. The simulation and experimental results show that when the number of channels is large or the network loads are heavy, OMA improves energy efficiency and throughput significantly compared with other works in the literature. © 2010 IEEE.

关键词： Sensor nodes

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OCO: A multi-channel MAC protocol with opportunistic cooperation for wireless sensor networks

OCO: A multi-channel MAC protocol with opportunistic coopera...

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International Workshop on Wireless Network Algorithm and Theory

ISBN: (纸本)9780769543222

To handle the triple hidden terminal problems, this paper proposes OCO, an asynchronous multi-channel MAC protocol with opportunistic cooperation for wireless sensor networks. By adopting opportunistic cooperation, OCO effectively alleviates, if not eliminates, the triple hidden terminal problems. More importantly, OCO is fully distributed with no requirements of time synchronization or multi-radio scheme, so it is easy to be implemented on the real sensor nodes. Via the theoretical analysis, the opportunistic probability that a node cooperates with its neighbor is obtained. To validate the effectiveness of opportunistic cooperation, extensive simulations and real testbed experiments were conducted. The simulation and experimental results show that when the number of channels is large or the network loads are heavy, OCO improves energy efficiency and throughput significantly compared with other works in the literature. © 2010 IEEE.

关键词： Sensor nodes

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DCM: A duty cycle based multi-channel MAC protocol for wireless sensor networks

DCM: A duty cycle based multi-channel MAC protocol for wirel...

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IET International Conference on Wireless Sensor Network 2010, IET-WSN 2010

ISBN: (纸本)9781849192392

Limitations of current multi-channel MAC protocols include requiring of strict time synchronization, existing large number of multi-channel hidden terminals, and lacking single-hop broadcast support and sleep mechanism, i.e. duty cycling. This paper proposes an asynchronous duty cycle based multichannel MAC protocol, called DCM, for wireless sensor networks. Instead of requiring time synchronization among nodes, DCM takes advantage of receiver-initiated cross channel handshake mechanism to make a channel reservation for data transmission, and employs receiver adjustment mechanism to tackle the problem of the loss of broadcasting data and to improve broadcast reliability. According to theoretical analysis using Queueing theory, this paper obtains the average number of available channels. The simulation and testbed experimental results show that DCM reduces the number of multi-channel hidden terminals effectively, and achieves significant improvement in network throughput with increasing benefit as traffic loads increase while maintaining higher energy efficiency.

关键词： Wireless sensor networks

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