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international conference on Physics and Control

作者： J.S. Baras Department of Electrical and Computer Engineering and the Institute of Systems Research University of Maryland College Park MA USA

In this paper, we consider multi-agent stochastic optimization and control problems, with partial information. The agent can operate in a distributed and asynchronous fashion. We investigate new problems that arise out of the interaction between observations and control actions by the agent. We show that new non-classical and non-commutative probability models are needed in order to properly formulate such problems. The models we develop here are inspired by models developed for dynamical physics problems. We establish a series of fundamental results for the trade-off between information and control patterns in distributed stochastic control, detection and estimation.

关键词： Stochastic processes Physics Control systems Stochastic systems Feedback Communication system control Quantum computing Educational institutions Cost function sensor systems

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A distributed infrastructure for veterinary telemedicine

A distributed infrastructure for veterinary telemedicine

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Annual international conference of the ieee Engineering in Medicine and Biology Society (EMBC)

作者： S. Warren L. Nagl R. Schmitz J. Yao T. Hildreth H. Erickson D. Poole D. Andresen Department of Electrical Engineering Kansas State University Manhattan KS USA Department of Anatomy & Physiology College of Veterinary Medicine Kansas State University Manhattan KS USA Department of Computing & Information Sciences Kansas State University Manhattan KS USA

The livestock industry can benefit tremendously from systems that continuously monitor cattle state-of-health, allowing the industry to maintain high meat quality, react to the presence of disease, and predict its spread. Requirements for these monitoring systems are similar to requirements that drive human ambulatory monitoring systems based on wearable sensors and wireless data communication. This paper presents early results from an effort to develop a veterinary telemedicine infrastructure based upon wearable monitoring technology originally developed for home health care. The functional layout of the infrastructure is described, and initial hardware and physiological measurements are presented.

关键词： Telemedicine Biomedical monitoring Agriculture Cows Diseases Humans Wearable sensors Wireless sensor networks Wireless communication Data communication

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Cooperative computing for distributed embedded systems

Cooperative computing for distributed embedded systems

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22nd international conference on distributed computing systems

作者： Borcea, C Iyer, D Kang, PL Saxena, A Iftode, L Rutgers State Univ Div Comp & Informat Sci Piscataway NJ 08854 USA

ISBN: (纸本)0769515851

The next generation of computing systems will be embedded, in a virtually unbounded number, and dynamically connected. The current software, network architectures, and their associated programming models are not suitable for this scenario. This paper presents a distributed computing model, Cooperative computing, and the Smart Messages architecture for programming large networks of embedded systems. In Cooperative computing, distributed applications are dynamic collections of migratory execution units, called Smart Messages, working to achieve a common goal. Virtually any user-defined distributed application can be implemented using our model. We present preliminary results for our prototype implementation as well as simulation results for two previously proposed applications for sensor networks, Directed Diffusion and SPIN, implemented using Smart Messages.

关键词： Computer supported cooperative work

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Impact of network density on data aggregation in wireless sensor networks

Impact of network density on data aggregation in wireless se...

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22nd international conference on distributed computing systems

作者： Intanagonwiwat, C Estrin, D Govindan, R Heidemann, J ISI USC Julich Germany

ISBN: (纸本)0769515851

In-network data aggregation is essential for wireless sensor networks where energy resources are limited. In a previously proposed data dissemination scheme (directed diffusion with opportunistic aggregation), data is opportunistically aggregated at intermediate nodes on a low-latency tree. In this paper, we explore and evaluate greedy aggregation, a novel approach that adjusts aggregation points to increase the amount of path sharing, reducing energy consumption. Our preliminary results suggest that, under investigated scenarios, greed), aggregation can achieve tip to 45% energy savings over opportunistic aggregation in high-density networks without adversely impacting latency, or robustness.

关键词： Wireless telecommunication systems

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Performance evaluation of distributed computing paradigms in mobile ad hoc sensor networks 9

Performance evaluation of distributed computing paradigms in...

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9th international conference on Parallel and distributed systems (ICPADS 2002)

作者： Xu, YY Qi, HR Univ Tennessee Dept Elect & Comp Engn Knoxville TN 37996 USA

ISBN: (纸本)0769517609

The emergence of mobile ad hoc sensor networks has brought new challenges to traditional network design. This paper compares the performance of two distributed computing paradigms, the client/server-based paradigm and the mobile-agent-based paradigm, through mathematical modeling and simulation. Previous works have shown that the mobile-agent-based paradigm is more appropriate to handle computations in ad hoc sensor networks. However no simulation;work has been done to quantitatively measure the performance. This paper first describes how computing is accomplished in the mobile-agent-based paradigm. It then presents a modified mathematical model and uses the execution time as a metric to measure the Performance. Eight experiments are designed to show the effect of different parameters to the performance of the paradigms. Experimental results show that in the context of mobile ad hoc sensor networks with hundreds or Eden thousands of nodes, unreliable communication links, and reduced bandwidth, the mobile-agent-based computing provides solutions to low network latency and reliable data processing.

关键词： Bandwidth Computational modeling Computer networks Context Delay distributed computing Mathematical model Mobile communication Mobile computing Time measurement

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Introduction to the ieee Transactions on Mobile computing

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ieee Transactions on Mobile computing 2002年第1期1卷 2-3页

作者： La, Porta, Thomas F. IEEE

No abstract available

关键词： Mobile computing Pervasive computing Computer Networks Application Software Computer Architecture Communication Networks IP Networks Web And Internet Services Communications Technology Mobile Communication

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The impact of data aggregation in wireless sensor networks 22

The impact of data aggregation in wireless sensor networks

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22nd international conference on distributed computing systems

作者： Krishnamachari, B Estrin, D Wicker, S Cornell Univ ECE Ithaca NY 14853 USA

ISBN: (纸本)0769515886

sensor networks are distributed event-based systems that differ from traditional communication networks in several ways: sensor networks have severe energy constraints, redundant low-rate data, and many-to-one flows. Data-centric mechanisms that perform in-network aggregation of data are needed in this setting for energy-efficient information flow. In this paper we model data-centric routing and compare its performance with traditional end-to-end routing schemes. We examine the impact of source-destination placement and communication network density on the energy costs and delay associated with data aggregation. We show that data-centric routing offers significant performance gains across a wide range of operational scenarios. We also examine the complexity of optimal data aggregation, showing that although it is an NP-hard problem in general, there exist useful polynomial-time special cases.

关键词： Energy efficiency

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Performance of a distributed robotic system using shared communications channels

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ieee TRANSACTIONS ON ROBOTICS AND AUTOMATION 2002年第5期18卷 713-727页

作者： Rybski, PE Stoeter, SA Gini, M Hougen, DF Papanikolopoulos, NP Univ Minnesota Dept Comp Sci & Engn Ctr Distributed Robot Minneapolis MN 55455 USA

We have designed and built a set of miniature robots called Scouts and have developed a distributed software system to control them. This paper addresses the fundamental choices we made in the design of the control software, describes experimental results in a surveillance task, and analyzes the factors that affect robot performance. Space and power limitations on the Scouts severely restrict the computational power of their on-board computers, requiring a proxy-processing scheme in which the robots depend on remote computers for their computing needs. While this allows the robots to be autonomous, the fact that robots' behaviors are executed remotely introduces an additional complication-sensor data and motion commands have to be exchanged using wireless communications channels. Communications channels cannot always be shared, thus requiring the robots to obtain exclusive access to them. We present experimental results on a surveillance task in which multiple robots patrol an area and watch for motion. We discuss how the limited communications bandwidth affects robot performance in accomplishing the task, and analyze how performance depends on the number of robots that share the bandwidth.

关键词： distributed software architecture mobile robots multiple robots resource allocation

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Parallel Lanczos bidiagonalization for Total Least Squares Filter in robot navigation

Parallel Lanczos bidiagonalization for Total Least Squares F...

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international conference on Parallel computing in Electrical Engineering (PAR ELEC 2002)

作者： Yang, LT St Francis Xavier Univ Dept Comp Sci Antigonish NS B2G 2W5 Canada

ISBN: (纸本)0769517307;0769517315

In the robot navigation problem, noisy sensor data must be filtered to obtain the best estimate of the robot position. The discrete Kalman filter, which usually is used for prediction and detection of signal in communication and control problems has become a commonly used method to reduce the effect of uncertainty from the sensor data. However, due to the special domain of robot navigation, the Kalman approach is very limited. The use of Total Least Squares Filter has been proposed 13] which is capable of converging with many fewer readings and achieving greater accuracy than the classical Kalman filter. The main disadvantage of those approaches is that they can not deal with the case where the noise subspace of dimension higher than one. Here a parallel Krylov subspace method on parallel distributed memory computers which uses the Lanezos bidiagonalization process with updating techniques is proposed which is more computationally attractive to solve the total least squares problems. The parallel algorithm is derived such that all inner products of a single iteration step are independent. Therefore, the cost of global communication which represents the bottleneck of the parallel performance on parallel distributed memory computers can be significantly reduced. This filter is very promising for very large data information and from our very preliminary experiments we can obtain more precise accuracy and better speedup.

关键词： Communication system control Concurrent computing distributed computing Filters Least squares methods Motion planning Navigation Parallel robots Robot sensing systems Signal detection

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An energy-efficient diagonal-based directed diffusion for wireless sensor networks 9

An energy-efficient diagonal-based directed diffusion for wi...

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9th international conference on Parallel and distributed systems, ICPADS 2002

作者： Chen, Yuh-Shyan Nian, Yau-Wen Sheu, Jang-Ping Department of Computer Science and Information Engineering National Chung Cheng University Chiayi Taiwan Department of Computer Science and Information Engineering National Central University Chung-Li Taiwan

ISBN: (纸本)0769517609

We present a new energy-efficient directed diffusion protocol by using the proposed diagonal-based hexagonal-mesh scheme for a wireless sensor network. The wireless sensor network is more reasonable to build a fixed-topological wireless network environment than the conventional MANET due to the low mobility. Therefore, all sensor nodes are arranged into a fixed-topological wireless network structure, namely the hexagonal-mesh, while the MAC protocol is adopted using the periodic active-and-sleep model. The wireless sensor networks use battery-operated computing and sensing devices. The directed diffusion is mainly operated on the diagonal-paths of the hexagonal-mesh under the energy-efficient consideration. To achieve the energy-efficient purpose, our diagonal-based directed diffusion scheme has the following main contributions: (1) a periodic active-and-sleep MAC protocol on TDMA channel model is designed;(2) a periodic backbone-path-exchange scheme is periodically performed on the diagonal-mesh to consider the per-node fairness problem;and (3) a directed diffusion communication application is developed based on the diagonal-based scheme. Finally, the performance analysis result is demonstrated to illustrate the energy-efficient achievement of our proposed scheme. © 2002 ieee.

关键词： Energy efficiency

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