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A fully polynomial approximation algorithm for collaborative relaying in sensor networks under finite rate constraints 07

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Proceedings of the 3rd ieee international conference on distributed computing in sensor systems

作者： Rajgopal Kannan Shuangqing Wei Vasu Chakravarthy Murali Rangaswamy Dept of CS Louisiana State University Baton Rouge LA Department of ECE Louisiana State University Baton Rouge LA Air Force Research Laboratories Wright-Patterson AFB Dayton OH Air Force Research Laboratories Hanscom AFB MA

ISBN: (纸本)9783540730897

We take an algorithmic approach to a well-known communication channel problem and develop several algorithms for solving it. Specifically, we develop power control algorithms for sensor networks with collaborative relaying under bandwidth constraints, via quantization of finite rate (bandwidth limited) feedback channels. We first consider the power allocation problem under collaborative relaying where the tradeoff between minimizing ones own energy expenditure and the energy for relaying is considered under the constraints of packet outage probability and bandwidth constrained (finite rate) feedback. Then we develop bandwidth constrained quantization algorithms (due to the finite rate feedback) that seek the optimal way of quantizing channel quality and power values in order to minimize the total average transmission power and satisfy the given probability of outage. We develop two kinds of quantization protocols and associated quantization algorithms. For separate source-relay quantization, we reduce the problem to the well-known k-median problem [1] on line graphs and show a a simple O((KJ)2N) polynomial time algorithm, where log2 KJ is the quantization bandwidth and N is the size of the discretized parameter space. For joint quantization, we first develop a simple 2-factor approximation of complexity O(KJN + N logN). Then, for Ɛ > 0, we develop a fully polynomial approximation scheme (FPAS) that approximates the optimal quantization cost to within an 1+Ɛ-factor. The running time of the FPAS is polynomial in 1/Ɛ, size of the input N and also ln F, where F is the maximum available transmit power.

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Conceptual Mission Analysis for RS Micro-Satellite: EgyptIris-1

Conceptual Mission Analysis for RS Micro-Satellite: EgyptIri...

引用

international conference on Recent Advances in Space Technologies (RAST)

作者： A. M. Elhady National Authority슠for슠Remote Sensing and Space Sciences Cairo Egypt

An experimental micro-satellite project accepts a number of characteristics typically denounced in commercial spacecraft development. These include acceptance of high risk, little component redundancy of the experiments, low-precision control, non-optimal designs, and limited mission duration. It is proposed to use a micro-satellite as a platform for the research and development of micro system technology to enhance the knowledge infrastructure of micro system technology and its applications in space. The present research is focused on micro systems with emphasis on lower mass, lower volume, lower power and enhanced flexibility/reconfigurability. The experimental micro satellite provides an opportunity for commercial of the shelf component and system (sensors and actuators) qualification, monitoring its behavior in a space environment and autonomous system experiments. EgyptIris-l micro-satellite is an experimental remote sensing satellite of small physical size and mass, will operate in a Near Earth Orbit and have a ground sampling distance in the range (10-15)m, which will allow many civilian services. EgyptIris-l project aims at enhancement of scientific capabilities and experience in the field of satellite technologies and space-born Earth observation for the benefit of science and technology to serve in peaceful use of such project. Also, within the partnership framework we aim to manage the project as a geographically distributed teams building different subsystems of EgyptIris-l and combining as well existing knowledge and experience of partners and enhancement if enthusiasm and talent of young students. In addition, an important goal is to develop a robust platform structure capable to serve in many launch vehicles and different mission applications. Preliminary calculations will be carried out to investigate the suitable orbit to achieve mission requirements and define the worst space environment parameters affecting the satellite mission performance. The c

关键词： Satellites Space technology Remote monitoring Peace technology Buildings Space vehicles Research and development sensor systems Actuators Qualifications

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RTNS: an NS-2 extension to simulate wireless real-time distributed systems for structured topologies 07

RTNS: an NS-2 extension to simulate wireless real-time distr...

引用

Proceedings of the 3rd international conference on Wireless internet

作者： Paolo Pagano Mangesh Chitnis Giuseppe Lipari Scuola Superiore Sant'Anna Pisa Italy

ISBN: (纸本)9789639799127

Wireless sensor Networks are now being considered for use in industrial automation and process control. These applications present different characteristics with respect to classical WSN application domains. In particular, the nodes may have high computational load due to the high sampling frequencies; moreover, they present real-time constraints, as data must be processed and transmitted with bounded *** this paper, we present RTNS, a simulator for distributed realtime systems that allows to model and simulate the temporal behavior of network protocols, real-time Operating System and distributed applications. The tool has been developed as a plug-in extension of the popular NS-2 simulator, hence it is possible to reuse most of the packages already available for NS-2. The aspects related to real-time Operating System, the overhead of interrupt handlers and protocol management, and the set of concurrent tasks executing on each node, are modeled using the RTSim simulator. With respect to a previously documented version, the package now has an extended scope and can model complex multi-hop *** presenting the simulator structure, we show how the tool can be used to model and simulate realistic WSN scenarios. Hereby, three examples are presented with the aim of showing how possible failures in the nodes or a load suddenly appearing in gateways connecting neighbor clusters for structured topologies can cause a worsening in the end-to-end transmission delays. We show that the adoption of a real-time Operating System in the nodes along with a proper scheduling policy for tasks can avoid (or at least keep under control) unpredictable effects in end-to-end delay.

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Optimal 3-Dimensional sensor Deployment Strategy

Optimal 3-Dimensional Sensor Deployment Strategy

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3rd ieee Consumer Communications and Networking conference

作者： Watfa, Mohamed K. Commuri, Sesh Univ Oklahoma Dept Elect & Comp Engn Norman OK 73019 USA

ISBN: (纸本)9781424400850

Recent advances in computing technology have led to the production of a new class of computing device: the wireless, battery powered, smart sensor. A Wireless sensor Network (WSN) is an ad-hoc network composed of densely-populated tiny electronic sensing devices, distributed over an area or volume. Deployment of a sensor network can be in a random fashion or can be planted manually. These networks promise a maintenance free, fault-tolerant platform for gathering different kinds of data. In this paper, contrary to existing techniques, the deployment problem in a three dimensional space is rigorously analyzed. The problem of determining the minimum number of sensor nodes that guarantee complete coverage is studied which will serve as an optimality measure for the coverage problem.

关键词： Ad-Hoc and sensor Networks Coverage 3D Deployment

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Platform support for autonomic computing: A research vehicle

Platform support for autonomic computing: A research vehicle

引用

3rd international conference on Autonomic computing, ICAC 2006

作者： Durham, Lenitra M. Milenkovic, Milan Cayton, Phil Intel Corporation

ISBN: (纸本)1424401755

Vast majority of autonomic frameworks and agents reported in literature seem to be implemented in higher layers of software. This paper describes a research project focused on exploring the nature and value of providing platform support for autonomic computing. We postulate that autonomic systems can provide increased manageability and higher availability by executing in an autonomous execution environment and by having rich sensory information at their disposal. We describe the system architecture and prototype environment. © 2006 ieee.

关键词： distributed computer systems

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Discovering likely invariants of distributed transaction systems for autonomic system management

Discovering likely invariants of distributed transaction sys...

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3rd international conference on Autonomic computing, ICAC 2006

作者： Jiang, Guofei Chen, Haifeng Yoshihira, Kenji NEC Laboratories America 4 Independence Way Princeton NJ 08540

ISBN: (纸本)1424401755

Large amount of monitoring data can be collected from distributed systems as the observables to analyze system behaviors. However, without reasonable models to characterize systems, we can hardly interpret such monitoring data effectively for system management. In this paper, a new concept named flow intensity is introduced to measure the intensity with which internal monitoring data reacts to the volume of user requests in distributed transaction systems. We propose a novel approach to automatically model and search relationships between the flow intensities measured at various points across the system. If the modeled relationships hold all the time, they are regarded as invariants of the underlying system. Experimental results from a real system demonstrate that such invariants widely exist in distributed transaction systems. Further we discuss how such invariants can be used to characterize complex systems and support autonomic system management. © 2006 ieee.

关键词： distributed computer systems

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sensor localization and camera calibration in distributed camera sensor networks

Sensor localization and camera calibration in distributed ca...

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3rd international conference on Broadband Communications Networks and systems

作者： Barton-Sweeney, Andrew Lymberopoulos, Dimitrios Savvides, Andreas Yale Univ Dept Elect Engn Embedded Networks & Applicat Lab New Haven CT 06520 USA

ISBN: (纸本)9781424404247

Camera sensors constitute an information rich sensing modality with many potential applications in sensor networks. Their effectiveness in a sensor network setting however greatly relies on their ability to calibrate with respect to each other, and other sensors in the field. This paper examines node localization and camera calibration using the shared field of view of camera pairs. Using a new distributed camera sensor network we compare two approaches from computer vision and propose an algorithm that combines a sparse set of distance measurements with image information to accurately localize nodes in 3D. Our algorithms are evaluated using a network of iMote2 nodes equipped with COTS camera modules. The sensor nodes identify themselves to cameras using modulated LED emissions. Our indoor experiments yielded a 2-7cm error in a 6x6m room. Our outdoor experiments in a 30x30m field resulted in errors 20-80cm, depending on the method used.

关键词： Cameras

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Towards autonomic grid data management with virtualized distributed file systems

Towards autonomic grid data management with virtualized dist...

引用

3rd international conference on Autonomic computing, ICAC 2006

作者： Zhao, Ming Xu, Jing Figueiredo, Renato J. Electrical and Computer Engineering University of Florida

ISBN: (纸本)1424401755

Grid data management is a challenging task because of the heterogeneous, dynamic and large-scale nature of Grid environments. This paper proposes an autonomic Grid data management architecture based on virtualized distributed file systems and WSRF-compliant management services. Autonomic functions are integrated into the services to provide self-managing control over the different entities of Grid-wide file system sessions, in accordance with high-level objectives, and operate together to automatically achieve the desired data provisioning behaviors. Important autonomic features are designed and implemented in this system in the aspects of cache configuration, data replication and session redirection. Experiments with a prototype demonstrate that this architecture can automatically and substantially improve the performance and reliability of Grid data access. © 2006 ieee.

关键词： distributed computer systems

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Scalable communication security in video sensor networks

Scalable communication security in video sensor networks

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3rd international conference on Cybernetics and Information Technologies, systems and Applications/4th international conference on computing, Communications and Control Technologies

作者： Dong, Decun Zhang, Shujing Hu, Fei Madigan, Justin Tongji Univ Multimedia Signal Proc Inst Shanghai 200331 Peoples R China

ISBN: (纸本)9789806560833

Wireless Video sensor Networks (WiSe) has attracted wide attention since it could utilize large amount of low-cost, wireless interconnected, battery-driven camera sensors to monitor the object changes in harsh or remote environments. It is very important to make sure that the video transmission in such a distributed sensor network can countermeasure all types of network attacks such as inserted fake video clips, Sybil attacks (using faked sensor IDs), wormhole attacks (through setting up a better route to attract packets), etc. This paper will propose a light-weight security approach that can prevent typical WiSe network attacks however does not add much overhead to the wireless sensor communications. We have also conducted experimental analysis to verify the energy-efficiency of our WiSe security scheme. Our security proposal is based on a cluster-ripple WiSe routing architecture that is scalable to large network cases.

关键词： wireless video sensor networks (WiSe) multimedia wireless video transmission video security key management

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Adaptive performance control of computing systems via distributed cooperative control: Application to power management in computing clusters

Adaptive performance control of computing systems via distri...

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3rd international conference on Autonomic computing, ICAC 2006

作者： Wang, Mianyu Kandasamy, Nagarajan Guez, Allon Kam, Moshe Department of Electrical and Computer Engineering Drexel University Philadelphia PA 19104

ISBN: (纸本)1424401755

Advanced control and optimization techniques offer a theoretically sound basis to enable self-managing behavior in distributed computing models such as utility computing. To tractably solve the performance management problems of interest, including resource allocation and provisioning in such distributed computing environments, we develop a fully decentralized control framework wherein the optimization problem for the system is first decomposed into sub-problems, and each sub-problem is solved separately by individual controllers to achieve the overall performance objectives. Concepts from optimal control theory are used to implement individual controllers. The proposed framework is highly scalable, naturally tolerates controller failures, and allows for the dynamic addition/removal of controllers during system operation. As a case study, we apply the control framework to minimize the power consumed by a computing cluster subject to a dynamic workload while satisfying the specified quality-of-service goals. Simulations using real-world workload traces show that the proposed technique has very low control overhead, and adapts quickly to both workload variations and controller failures. © 2006 ieee.

关键词： distributed computer systems

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