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A feedback-based timeout packets dropping strategy in real-time wireless sensor networks

2nd World Congress on computer Science and information Engineering, CSIE 2011

作者： Shen, Zhuowei Xu, Peng Xu, Xiaoxi Key Lab. of Computer Network and Information Integration Ministry of Education School of Computer Sci. and Eng. Southeast University Nanjing China

ISBN: (纸本)9783642257681

Resource limited real-time wireless sensor network is a new type of application of sensor network. In this kind of networks, there are numerous invalid real-time packets, which have already expired or are destined to expire. In this paper, a feedback-based timeout packet dropping strategy (FBTPD) is proposed. With this strategy, timestamps are piggybacked in real-time packets. So that sink node can gather the historical information and estimate the future transmitting time of some sensor node. Then the estimated transmitting time is fed back to the sensor node in a feedback packet. The sensor node hereby drops the invalid realtime packets which will expire later. Simulation experiments reveal that: compared with other dropping policies, FBTPD can drop more invalid real-time packets, and can significantly improve the throughput of the non real-time packets. Thus FBTPD can efficiently boost the resources utilization in wireless sensor networks, especially in hybrid real-time wireless sensor networks. © Springer-Verlag Berlin Heidelberg 2012.

关键词： Real time systems

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Overlapping community detection combining content and link

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Journal of Zhejiang University-Science C(computers and Electronics) 2012年第11期13卷 828-839页

作者： Zhou-zhou HE Zhong-fei(Mark)ZHANG Philip S.YU Zhejiang Provincial Key Laboratory of Information Network Technology Department of Information Science and Electronic EngineeringZhejiang UniversityHangzhou 310027China Department of Computer Science University of Illinois at ChicagoIL 60607USA

In classic community detection, it is assumed that communities are exclusive, in the sense of either soft clustering or hard clustering. It has come to attention in the recent literature that many real-world problems violate this assumption, and thus overlapping community detection has become a hot research topic. The existing work on this topic uses either content or link information, but not both of them. In this paper, we deal with the issue of overlapping community detection by combining content and link information. We develop an effective solution called subgraph overlapping clustering (SOC) and evaluate this new approach in comparison with several peer methods in the literature that use either content or link information. The evaluations demonstrate the effectiveness and promise of SOC in dealing with large scale real datasets.

关键词： Overlapping Content Link Community detection

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Semantic access control for cloud computing based on e-Healthcare

Semantic access control for cloud computing based on e-Healt...

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2012 IEEE 16th International Conference on computer Supported Cooperative Work in Design, CSCWD 2012

作者： Sun, Lili Wang, Hua Yong, Jianming Wu, Guoxin Centre for Systems Biology University of Southern Queensland Toowoomba Australia School of Information Systems University of Southern Queensland Toowoomba Australia School of Computer Science and Engineering Key Laboratory for Computer Network and Information Integration Southeast University China

ISBN: (纸本)9781467312127

With the increased development of cloud computing, access control policies have become an important issue in the security filed of cloud computing. Semantic web is the extension of current Web which aims at automation, integration and reuse of data among different web applications such as clouding computing. However, Semantic web applications pose some new requirements for security mechanisms especially in the access control models. In this paper, we analyse existing access control methods and present a semantic based access control model which considers semantic relations among different entities in cloud computing environment. We have enriched the research for semantic web technology with role-based access control that is able to be applied in the field of medical information system or e-Healthcare system. This work demonstrates how the semantic web technology provides efficient solutions for the management of complex and distributed data in heterogeneous systems, and it can be used in the medical information systems as well. © 2012 IEEE.

关键词： Cloud computing

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Data stream clustering algorithm based on spatial directed graph

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Advances in information Sciences and Service Sciences 2012年第20期4卷 241-249页

作者： Ren, Jiadong Yuan, Xuemei Dong, Jun College of Information Science and Engineering Yanshan University Qinhuangdao Hebei 066004 China The Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province Qinhuangdao City 066004 China

Recently, the grid-density based clustering has become one of the major issues among all of the clustering approaches, it has special advantages over other clustering algorithms, such as less computation and the ability of clustering with arbitrarily shape, which are particularly useful for the data stream clustering. This paper defines a spatial directed graph named Grid-Based Graph (GBG) to store the non-empty grids in data space, and proposes a data stream clustering algorithm based on spatial directed graph GBGSClu (Grid-Based Graph Stream Clustering). GBG graph composes of vertices and directed edges, if a vertex A has a neighboring dense vertex B, and then there is a directed edge from vertex B to A in GBG. The algorithm maps the data stream into the non-empty vertices online, updates the vertices' feature vectors with the arriving of data stream, deletes the sparse vertices every gap time, generates GBG graph when the clustering quest coming and finally clusters on the current structure. The eventual clustering results can be obtained by only checking the vertices' in-degree which can reduce the computation needed in clustering. The validity and efficiency of GBGSClu algorithm have been tested and verified by clustering on real and synthetic datasets.

关键词： Directed graphs

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PASS: An adaptive multi-copy routing scheme for intermittently connected mobile Ad Hoc networks

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Journal of Convergence information Technology 2012年第14期7卷 315-323页

作者： Xu, Jia Wang, Ru Chuan Sun, Li Juan College of Computer Nanjing University of Posts and Telecommunications Nanjing China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Jiangsu Province Nanjing China Key Laboratory for Computer Network and Information Integration Southeast University Ministry of Education Nanjing China State Key Lab. for Novel Software Technology Nanjing University Nanjing China

Intermittently Connected Mobile Ad Hoc networks (ICMANs) are mobile networks in which complete source-to-destination paths do not exist most of the time. This paper proposed a Predictable Adaptive Seed Spray routing (PASS) for intermittently connected mobile Ad Hoc networks. PASS is a cost-efficient delay-bounded routing protocol without network parameters and provides acceptable and resilient service in the face of challenged environments. Simulations have shown that PASS outperforms existing schemes such as Epidemic, binary spray & wait and AMR with respect to routing cost and adaptability.

关键词： Routing protocols

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Conflict-based belief revision operators in possibilistic logic 26

Conflict-based belief revision operators in possibilistic lo...

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26th AAAI Conference on Artificial Intelligence and the 24th Innovative Applications of Artificial Intelligence Conference, AAAI-12 / IAAI-12

作者： Qi, Guilin Wang, Kewen Key Laboratory of Computer Network and Information Integration of State Education Ministry School of Computer Science and Engineering Southeast University China Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education Jilin University Changchun 130012 China School of Computing and Information Technology Griffith University Australia

ISBN: (纸本)9781577355687

In this paper, we investigate belief revision in possibilistic logic, which is a weighted logic proposed to deal with incomplete and uncertain information. Existing revision operators in possibilistic logic are restricted in the sense that the input information can only be a formula instead of a possibilistic knowledge base which is a set of weighted formulas. To break this restriction, we consider weighted prime implicants of a possibilistic knowledge base and use them to define novel revision operators in possibilistic logic. Intuitively, a weighted prime implicant of a possibilistic knowledge base is a logically weakest possibilistic term (i.e., a set of weighted literals) that can entail the knowledge base. We first show that the existing definition of a weighted prime implicant is problematic and need a modification. To define a revision operator using weighted prime implicants, we face two problems. The first problem is that we need to define the notion of a conflict set between two weighted prime implicants of two possibilistic knowledge bases to achieve minimal change. The second problem is that we need to define the disjunction of possibilistic terms. We solve these problems and define two conflict-based revision operators in possibilistic logic. We then adapt the well-known postulates for revision proposed by Katsuno and Mendelzon and show that our revision operators satisfy four of the basic adapted postulates and satisfy two others in some special cases. Copyright © 2012, Association for the Advancement of Artificial Intelligence. All rights reserved.

关键词： Problem solving

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Zigbee enabled remote temperature monitor system for high-voltage substations

Zigbee enabled remote temperature monitor system for high-vo...

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2012 Spring World Congress on Engineering and Technology, SCET 2012

作者： Jun, Zhang Wei, Dai Di, Huang Sanfeng, Zhang Yi, Ji College of Software Engineering Southeast University Nanjing China College of Computer Science and Engineering Southeast University Nanjing China Key Laboratory of Computer Network and Information Integration Southeast University Ministry of Education Nanjing China

ISBN: (纸本)9781457719646

in high-voltage substations, poor contacts at the junctions of contacts can generate heat leading to high temperature, arc and fire disaster in serious condition. In this paper, we present a remote temperature monitor system to monitor and alarm when temperature of the contacts increases. The system measures temperature by sensor node based on low power consuming temperature sensor and Zigbee communication because power consuming becomes a critical fact constrained by long term running and inconvenient maintenance of high-voltage substations. In the system, sensor nodes are deployed on the contacts to be measured, cluster headers in charge of collecting data from sensor nodes are deployed on each distributor and cluster headers are connected with mast monitor computer via RS485 network. This paper presents design, implementation and test of sensor nodes, cluster headers and the master monitor software. © 2012 IEEE.

关键词： Sensor nodes

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Remote gas meter reading system based on zigbee networks

Remote gas meter reading system based on zigbee networks

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2012 Spring World Congress on Engineering and Technology, SCET 2012

作者： Cai, Shun Zhang, Sanfeng Huang, Di Yu, Shaofeng College of Computer Science and Engineering Southeast University Nanjing China Key Laboratory of Computer Network and Information Integration Southeast University Ministry of Education Nanjing China College of Software Engineering Southeast University Nanjing China

ISBN: (纸本)9781457719646

recently, intelligent home instruments developed fast and have been deployed widely while a crucial problem of how dealing the left devices and properties come up to the top of the water. This paper presents a remote gas meter reading system based on multimedia Zigbee networks and digital image recognition technologies to alleviate difficulties existing in traditional gas meter reading work while keeping existing gas meters unchanged. In the system, sensor nodes take picture of gas meter by a CMOS camera and send it to the sink node over multi-Zigbee-hop in a residential quarter. Then the gas providing company can access gas meter pictures through the Internet and recognize the data automatically by computer vision technology. Making up the gap between the high bandwidth consuming, high reliable requiring picture transport and the bandwidth constrained, error-prone Zigbee networks, this paper also proposes an opportunistic routing with network coding method to improve end-to-end throughput of the whole network. © 2012 IEEE.

关键词： Gases

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A new operator for ABox revision in DL-Lite 26

A new operator for ABox revision in DL-Lite

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26th AAAI Conference on Artificial Intelligence and the 24th Innovative Applications of Artificial Intelligence Conference, AAAI-12 / IAAI-12

作者： Gao, Sibei Qi, Guilin Wang, Haofen Key Laboratory of Computer Network and Information Integration of State Education Ministry School of Computer Science and Engineering Southeast University China SiPaiLou #2 Nanjing 210096 China Shanghai Jiao Tong University Shanghai China

In this paper, we propose a new operator for revising ABoxes in DL-Lite ontologies. We present a graph-based algorithm for ABox revision in DL-Lite, which implements the revision operator and we show it runs in polyno... 详细信息

ISBN: (纸本)9781577355687

关键词： Ontology

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Nonlinearity profile test for an S-box

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2011 International Conference on Future Wireless networks and information Systems, ICFWI 2011

作者： Gao, Sheng Ma, Wenping Zhu, Jiwei Key Laboratory of Computer Network and Information Security Ministry of Education Xidian University Xi'an 710071 China

ISBN: (纸本)9783642273223

A new security test for substitution boxes (S-boxes), the nonlinearity profile test, is presented, together with its results over the S-boxes of DES and AES. The test can be used to measure the global nonlinearity for an S-box effectively, which overcomes the disadvantage of existing methods that cannot evaluate the nonlinear capacity of an S-box against attacks which keep some input bits constant. © 2012 Springer-Verlag GmbH.

关键词： Cryptography

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