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Theoretical treatment of sink scheduling problem in wireless sensor networks

Theoretical treatment of sink scheduling problem in wireless...

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2011 IEEE Conference on computer Communications Workshops, INFOCOM WKSHPS 2011

作者： Gu, Yu Ji, Yusheng Li, Jie Zhao, Baohua Information Systems Architecture Science Research Division National Institute of Informatics Tokyo Japan State Key Laboratory of Networking and Switching Technology Beijing 100876 China School of Computer Science Univ. of Science and Technology of China Hefei Anhui 230027 China Department of Computer Science University of Tsukuba Ibaraki 305-8573 Japan

ISBN: (纸本)9781457702488

Sink Scheduling, in the form of scheduling multiple sinks among sink sites to leverage traffic burden, is an effective mechanism for the energy-efficiency of wireless sensor networks (WSNs). Due to the inherent difficulty (NP-hard in general), existing works on this topic mainly focus on heuristic/greedy algorithms and theoretic results remain unknown. In this paper, we fill in the research blank with two algorithms. The first one is based on the Column Generation (CG). It decomposes the original problem into two sub problems and solve them iteratively to approach the optimal solution. However, due to its high computational complexity, this algorithm is only suitable for small scale networks. The other one is a polynomial-time algorithm based on relaxation techniques to obtain an upperbound, which can serve as a performance benchmark for other algorithms on this problem. Through comprehensive simulations, we evaluate the efficiency of proposed algorithms. © 2011 IEEE.

关键词： Wireless sensor networks

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Research on Embedded GPS/GPRS Intelligent Building Security Technology

Research on Embedded GPS/GPRS Intelligent Building Security ...

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2011 4th IEEE International Conference on computer science and Information Technology(ICCSIT 2011)

作者： Di Juxing Zhao Jianguang Si Yachao fanjingjing Department of Computer Science Hebei Institute of Architecture Civil Engineering

ISBN: (纸本)9781612848334

This paper studied GPS location information of the collection, processing, GPRS data transmission network, intelligent building security system features. Based on this techniques, we designed an embedded GPS/GPRS intelligent building security system, which is composed of ARM9 microprocessor S3C2410, GPS/GPRS module and some peripheral devices. The system is running under Linux OS. The characteristics of the system are flexible, powerful, and high practicality.

关键词： Embedded system intelligence building GPS GPRS

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A scalable parallel ray tracing algorithm for satellite imagery

A scalable parallel ray tracing algorithm for satellite imag...

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IEEE International Conference on computer Research and Development

作者： Li, Yu-Gang Zhao, Kun Huang, Yu-Qing Qiu, Zhen-Ge Liu, Zhi-Yong Beijing Lab. of Intelligent Information Technology School of Computer Science BIT Beijing 100081 China Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100081 China Institute of Computing Technology Chinese Academy Sciences Beijing China

ISBN: (纸本)9781612848372

Ray-tracing, can produce high-quality images, however, the use of ray-tracing has been limited due to its high demands on computational power and memory bandwidth, especially in the case of satellite imagery. In this paper, we propose a scalable parallel ray tracing algorithm of satellite imagery on a cluster of multi-core architecture. The algorithm combines demand-driven and data-driven models in order to reduce communication on the cost of maintaining redundant data. In order to make the most of computer's parallelism and increase computational efficiency, it combines two levels of parallelisms, the TLP parallelism brought by the many core architecture and the inter-node parallelism via MPI and OpenMP. Experiment results show that the algorithm is highly scalability. © 2011 IEEE.

关键词： Satellite imagery

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A Data Aggregation Transfer Protocol Based on Clustering and Data Prediction in Wireless Sensor Networks

A Data Aggregation Transfer Protocol Based on Clustering and...

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International Conference on Wireless Communications, Networking and Mobile Computing (WiCom)

作者： Lingjun Meng Huazhong Zhang Yun Zou Institute of Computer System Architecture School of Computer Science and Technology Shandong University Jinan Shandong China

The energy of wireless sensor networks is limited and the energy consumption of wireless communication takes most of the total energy consumption of sensor nodes. This paper proposes an energy-efficient data aggregation transfer protocol based on clustering and data prediction called DACP. In the initialization phase sensor network nodes send messages to sink node, then sink node divides entire networks into several clusters and elects cluster head nodes for each cluster. In the prediction phase sensor member nodes receive predicted data and compare it with sensed data to decide whether send it or not. In the data aggregation phase cluster head nodes aggregate sensed data received from cluster member nodes and decide to send it to sink node or not according to receiving predicted data. It is effective to reduce data transmission and improve the efficiency of data aggregation by data prediction. Simulation results demonstrate that the proposed protocol can significantly provide longer lifetime and prolong the life of every node to survive.

关键词： Energy consumption Wireless communication Wireless sensor networks Clustering algorithms Routing protocols Magnetic heads

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ZONE-DIVIDED AND ENERGY-BALANCED CLUSTERING ROUTING PROTOCOL FOR WIRELESS SENSOR NETWORKS

ZONE-DIVIDED AND ENERGY-BALANCED CLUSTERING ROUTING PROTOCOL...

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2011 4th IEEE International Conference on Broadband Network & Multimedia Technology(第四届IEEE宽带网络与多媒体国际会议 4th IEEE IC-BNMT2011)

作者： Yun Zou Huazhong Zhang Xibei Jia Institute of Computer System Architecture School of Computer Science and TechnologyShandong University Jinan 250100 China

In wireless sensor networks, prolonging the life time is an important research topic. Based on the study of LEACH protocol and EEUC protocol, a novel zone-divided and energy-balanced clustering routing protocol for wireless sensor networks (ZECR) is brought up. The protocol divides the area into several zones according to the distance, and uses the unequal clustering method among these zones to solve the hot spots problem caused by multi-hop mechanism. In the cluster head election phase, only the nodes that meet the energy standard can participate in the competition;in the inter-cluster multi-hop routing phase, the cluster heads with high residual energy in high energy region will be selected as the relay node based on the advantages of zone-divided. Simulation results show that the protocol can effectively balance the energy consumption of each part of the network, solve the hot spots problem, apply to the energy heterogeneous network and prolong the network life time obviously.

关键词： wireless sensor networks LEACH unequal clustering energy-balanced routing protocol

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Distributed Mass-Spring-Relaxation for Anchor-Free Self-Localization in Sensor and Actor Networks

Distributed Mass-Spring-Relaxation for Anchor-Free Self-Loca...

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International Conference on computer Communications and Networks (ICCCN)

作者： Juergen Eckert Felix Villanueva Reinhard German Falko Dressler Computer Networks and Communication Systems Department of Computer Science University of Erlangen Germany Computer Architecture and Networks School of Computer Science University of Castilla La Mancha Spain Institute of Computer Science University of Innsbruck Austria

We present a fully self-organizing approach for creating and maintaining a reference coordinate system for self-localization in Sensor and Actor Networks (SANETs). GPS technology has become a de facto standard for outdoor localization, however, self-localization in GPS denied scenarios is still extremely challenging. Typically, anchor nodes or global state information are used to update the nodes' location information. In contrast, we present a fully self-organizing strategy to generate a distributed reference coordinate system. In particular, we use autonomous robot systems to span and maintain this coordinate system. In particular, we investigated the capabilities of the Mass-Spring-Relaxation (MSR) algorithm, which is frequently used for fault-tolerant and robust localization. Unfortunately, this algorithm needs certain globally valid state information. We extended the MSR algorithm in two ways: First, we made the algorithm independent of a priori global knowledge, and, secondly, we provide extensions that make the algorithm more reliable and robust, and to reduce the number of necessary information exchanges between the nodes. As can be seen from the simulation results, our advanced MSR is very accurate and clearly outperforms the classical MSR for increasing network sizes. We also validated the simulations in an experimental setting. The obtained results confirm the very high localization accuracy.

关键词： Springs Equations Distance measurement Artificial neural networks Hardware Robot sensing systems Accuracy

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Eliminating data invalidation in debugging multiple-clock chips

Eliminating data invalidation in debugging multiple-clock ch...

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作者： Gao, Jianliang Han, Yinhe Li, Xiaowei Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences China School of Information Science and Engineering Central South University China

ISBN: (纸本)9783981080179

A critical concern for post-silicon debug is the need to control the chip at clock cycle level. In a single clock chip, run-stop control can be implemented by gating the clock signal using a stop signal. However, data invalidation might occur when it comes to multiple-clock chips. In this paper, we analyze the possible data invalidation, including data repetition and data loss, when stopping and resuming a multiple-clock chip. Furthermore, we propose an efficient solution to eliminate data repetition and data loss. Theoretical analysis and simulation experiments are both conducted for the proposed solution. We implement the proposed Design-for-Debug (DfD) circuit with SMIC 0.18/Ltm technology and simulate the data transfer across clock domains using SPICE tool. The results show that both data repetition and data loss can be avoided with the proposed solution, even if metastability occurs. © 2011 EDAA.

关键词： Clocks

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An integrated approach for identity and access management in a SOA context 11

An integrated approach for identity and access management in...

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Proceedings of the 16th ACM symposium on Access control models and technologies

作者： Hummer, Waldemar Gaubatz, Patrick Strembeck, Mark Zdun, Uwe Dustdar, Schahram Distributed Systems Group Information Systems Institute Vienna University of Technology Austria Software Architecture Group Faculty of Computer Science University of Vienna Austria Information Systems Institute Vienna University of Economics and Business Austria

ISBN: (纸本)9781450307215

In this paper, we present an approach for identity and access management (IAM) in the context of (cross-organizational) serviceoriented architectures (SOA). In particular, we defined a domainspecific language (DSL) for role-based access control (RBAC) that allows for the definition of IAM policies for SOAs. For the application in a SOA context, our DSL environment automatically produces WS-BPEL (Business Process Execution Language for Web services) specifications from the RBAC models defined in our DSL. We use the WS-BPEL extension mechanism to annotate parts of the process definition with directives concerning the IAM policies. At deployment time, the WS-BPEL process is instrumented with special activities which are executed at runtime to ensure its compliance to the IAM policies. The algorithm that produces extended WS-BPEL specifications from DSL models is described in detail. Thereby, policies defined via our DSL are automatically mapped to the implementation level of a SOA-based business process. This way, the DSL decouples domain experts' concerns from the technical details of IAM policy specification and enforcement. Our approach thus enables (non-technical) domain experts, such as physicians or hospital clerks, to participate in defining and maintaining IAM policies in a SOA context. Based on a prototype implementation we also discuss several performance aspects of our approach. © 2011 ACM.

关键词： Web services

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Using pervasive computing and open space design to transform the schoolyard into an educational setting

Using pervasive computing and open space design to transform...

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2011 7th International Conference on Intelligent Environments, IE 2011

作者： Goumopoulos, Christos Papalexopoulos, Dimitris Kameas, Achilles Stavridou, Athina Tzimopoulou, Sonia Research Academic Computer Technology Institute Patras Greece School of Architecture NTUA Athens Greece School of Science and Technology Hellenic Open University Patras Greece UCL Greece NTUA Athens Greece

ISBN: (纸本)9780769544526

Educational process' experimental implementation with the support of Information Communication Technologies (ICT) integrated to the elective course "Principles of Environmental sciences" of the Second High School Class that combines environmental education, principles of space design, introduction to information technologies in ecology and "green" ICT, and sustainable development through the digital management of planting and of the introduction to the crucial wider issue of precision agriculture. The experimental implementation is realized in collaboration with the professors of the 1st General High School of Agios Dimitrios. Temperature sensors, humidity and illumination are placed in structures parametrically designed according to the bioclimatic conditions of the space of the school yard and have been sited in accordance with the operational needs of the complex. Students interact with plants and offer maintenance services when plants request it. © 2011 IEEE.

关键词： Ecology

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A domain partition model approach to the online fault recovery of FPGA-based reconfigurable systems

A domain partition model approach to the online fault recove...

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作者： Shang, Lihong Zhou, Mi Hu, Yu Yang, Erfu School of Computer Science and Engineering Beihang University Beijing 100191 China Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow Gl 1XW United Kingdom

Field programmable gate arrays (FPGAs) are widely used in reliability-critical systems due to their reconfiguration ability. However, with the shrinking device feature size and increasing die area, nowadays FPGAs can be deeply affected by the errors induced by electromigration and radiation. To improve the reliability of FPGA-based reconfigurable systems, a permanent fault recovery approach using a domain partition model is proposed in this paper. In the proposed approach, the fault-tolerant FPGA recovery from faults is realized by reloading a proper configuration from a pool of multiple alternative configurations with overlaps. The overlaps are presented as a set of vectors in the domain partition model. To enhance the reliability, a technical procedure is also presented in which the set of vectors are heuristically filtered so that the corresponding small overlaps can be merged into big ones. Experimental results are provided to demonstrate the effectiveness of the proposed approach through applying it to several benchmark circuits. Compared with previous approaches, the proposed approach increased MTTF by up to 18.87%. Copyright © 2011 The institute of Electronics, Information and Communication Engineers.

关键词： Fault tolerance

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