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检索条件"机构=Computer And Embedded Systems Lab"

共 140 条记录，以下是131-140 订阅

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Estimating clock uncertainty for efficient duty-cycling in sensor networks 05

Estimating clock uncertainty for efficient duty-cycling in s...

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3rd ACM International Conference on embedded Networked Sensor systems, SenSys 2005

作者： Ganeriwal, Saurabh Ganesan, Deepak Shim, Hohyun Tsiatsis, Vlasios Srivastava, Mani B. University of California Los Angeles Networked and Embedded Systems lab 56-125B EE-IV CA 90095 United States Department of Computer Science University of Massachusetts MA 01003 United States

ISBN: (纸本)159593054X

Radio duty cycling has received significant attention in sensor networking literature, particularly in the form of protocols for medium access control and topology management. While many protocols have claimed to achieve significant duty-cycling benefits in theory and simulation, these benefits have often not translated to practice. The dominant factor that prevents the optimal usage of the radio in real deployment settings is time uncertainty between sensor nodes. This paper proposes an uncertainty-driven approach to duty-cycling where a model of long-term clock drift is used to minimize the duty-cycling overhead. First, we use long-term empirical measurements to evaluate and analyze in-depth the interplay between three key parameters that influence long-term synchronization - synchronization rate, history of past synchronization beacons and the estimation scheme. Second, we use this measurement-based study to design a rate-adaptive, energy-efficient long-term time synchronization algorithm that can adapt to changing clock drift and environmental conditions while achieving application-specific precision with very high probability. Finally, we integrate our uncertainty-driven time synchronization scheme with a MAC layer protocol, BMAC, and empirically demonstrate one to two orders of magnitude reduction in the transmit energy consumption at a node with negligible impact on the packet loss rate. Categories and Subject Descriptors C.2.2 [computer systems Organization]: computer Communication Networks - Network Protocols. General Terms Algorithms, Experimentation, Performance, Verification. © 2005 ACM.

关键词： Synchronization

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Capturing processor architectures from protocol processing applications: a case study

Capturing processor architectures from protocol processing a...

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Euromicro Symposium on Digital System Design

作者： S. Virtanen J. Paakkulainen T. Nurmi Department of Information Tehnology Embedded Systems Lab Turku Centre for Computer Science (TUCS) University of Turku Turku Finland Department of Information Tehnology University of Turku Turku Finland

We present a case study in finding optimized processor architectures for a given protocol processing application. The process involves application analysis, hardware/software partitioning and optimization, and evaluation of design quality through simulations, estimations and synthesis. The case study was targeted at processing key IPv6 routing functions at 200 MHz using 0.18 /spl mu/m CMOS technology. A comparison to an implementation on a commercial processor revealed that the captured architectures provided similar or better performance. Especially checksum calculation was efficient in the captured architectures.

关键词： Protocols computer architecture Application software CMOS technology Hardware Software quality Design optimization Analytical models Routing CMOS process

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Data aware, low cost error correction for wireless sensor networks

Data aware, low cost error correction for wireless sensor ne...

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IEEE Conference on Wireless Communications and Networking

作者： S. Mukhopadhyay D. Panigrahi S. Dey Mobile Embedded Systems Design and Test Lab Department of Electrical and Computer Engineering University of California San Diego USA

One or the main challenges in adoption and deployment of wireless networked sensing applications is ensuring reliable sensor data collection and aggregation, while satisfying the low-cost, low-energy operating constraints of such applications. A wireless sensor network is inherently vulnerable to different sources of unreliability resulting in transient failures. Existing reliability techniques that address transient failures in circuits and communication channels incur prohibitively high energy, bandwidth and cost overheads in the sensor nodes. In this paper we investigate application-level error correction techniques for sensor networks that exploit the properties of sensor data to eliminate any overhead on the sensor nodes, at the expense of nominal buffer requirements at the data aggregator nodes, which are much less cost/energy constrained. Our approach involves use of spatio-temporal correlations in sensor data, the goals of the application, and its vulnerability to various errors. We present our error-correction algorithm and evaluate it through simulations using real and synthetic sensor data. Experimental results validate the feasibility of our approach to provide high degree of reliability in sensor data aggregation, without imposing overheads on sensor nodes.

关键词： Costs Error correction Wireless sensor networks Telecommunication network reliability Power system transients Crosstalk Circuits Application software Communication channels Monitoring

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Panel: Given that hardware verification has been an Uphill battle, what is the future of software verification?

Panel: Given that hardware verification has been an Uphill b...

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Proceedings - 2nd ACM and IEEE International Conference on Formal Methods and Models for Co-Design, MEMOCODE'04

作者： Shukla, Sandeep K. Bultan, Tevfik Heitmeyer, Constance FERMAT Lab. Center for Embedded Systems for Critical Applications Virginia Tech. Blacksburg VA 24060 Department of Computer Science University of California at Santa Barbara Santa Barbara CA 93106 United States Naval Research Laboratories Washington DC United States

ISBN: (纸本)0780385098

This industrial panel is organized to discuss the views, experiences and opinions of formal methods practitioners from design automation, hardware and software industries, in order to understand the industrial needs and trends in using formal methods. In particular, we discuss the current thrust on application of formal verification in software development, and what hardware formal verification experiences bring to bear for formal software verification. © 2004 IEEE.

关键词： computer hardware

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Poster abstract: Contour detection using actuated sensor networks

Poster abstract: Contour detection using actuated sensor net...

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SenSys'03: Proceedings of the First International Conference on embedded Networked Sensor systems

作者： Dantu, Karthik Sukhatme, Gaurav S. Robotic Embedded Systems Lab. Dept of Computer Science University of Southern California Los Angeles

ISBN: (纸本)1581137079

The detection of concentric contours that monotonically degrade in each direction from the (single) source was analyzed. Static sensor nodes were deployed at random in the plane and each node sensed the field its vicinity. The mobile sensor node collected the sensed values of the field gradient from its neighbor along with their location. Analysis shows that the fraction of detected contours increases as the average node degree of static sensor network increases.

关键词： Telecommunication networks

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Coverage, exploration, and deployment by a mobile robot and communication network

Coverage, exploration, and deployment by a mobile robot and ...

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2nd International Workshop on Information Processing in Sensor Networks, IPSN 2003

作者： Batalin, Maxim A. Sukhatme, Gaurav S. Robotic Embedded Systems Lab Computer Science Department Center for Robotics and Embedded Systems University of Southern California Los AngelesCA90089 United States

ISBN: (纸本)9783540021117

We consider the problem of coverage and exploration of an unknown dynamic environment using a mobile robot(s). The environment is assumed to be large enough such that constant motion by the robot(s) is needed to cover the environment. We present an efficient minimalist algorithm which assumes that global information is not available (neither a map, nor GPS). Our algorithm deploys a network of radio beacons which assists the robot(s) in coverage. This network is also used for navigation. The deployed network can also be used for applications other than coverage. Simulation experiments are presented which show the collaboration between the deployed network and mobile robot(s) for the tasks of coverage/exploration, network deployment and maintenance (repair), and mobile robot(s) recovery (homing behavior). We present a theoretical basis for our algorithm on graphs and show the results of the simulated scenario experiments. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Mobile robots

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SystemC simulation framework of protocol processing architectures for IPv6 routing

SystemC simulation framework of protocol processing architec...

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International Symposium on Signals, Circuits and systems (ISSCS)

作者： D. Truscan S. Virtanen J. Lilius Embedded Systems Lab Turku Centre for Computer Science Turku Finland

In this paper, we present our use of SystemC to simulate IPv6 router architecture on our TTA based protocol processor. Our approach makes it easy to verify the correct functionality and to identify performances bottlenecks in the architecture within a short time frame. All this is done prior to proceeding to synthesize the processor into hardware.

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Adaptive admission control of multimedia traffic in high-speed networks

Adaptive admission control of multimedia traffic in high-spe...

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Proceedings of the 2002 IEEE International Symposium on Intelligent Control

作者： Jagannathan, S. Tohmaz, A. Chronopoulos, Anthony Cheung, H.G. Embedded Systems and Networking Lab. Dept. of Electrical and Comp. Engg The University of Missouri-Rolla 1870 Miner Circle Rolla MO 65409 United States Parallel and Distributed Systems Lab Dept. of Computer Science The University of Texas-San Antonio 6900 North Loop 1604 West San Antonio TX 78249 United States

This paper proposes a novel real-time adaptive admission control (AAC) scheme with a desired quality of service (QoS) guarantee and high network utilization in high-speed networks. The QoS is given in terms of service delay, which is defined as the time it takes for a source to get admitted into the network after it initiates its intended request, packet/cell losses, and transmission delay (time taken to complete transmission from its initiation). AAC uses the following information- the available capacity from a novel adaptive bandwidth estimation scheme, a congestion indicator derived from a congestion controller, Peak Cell Rate (PCR) estimate from new sources, along with the desired QoS metrics, and outputs an 'admit' or 'reject' decision signal to the new sources while guaranteeing QoS and network utilization. Simulation results are presented by streaming ON/OFF and video data into the network. Results show that the proposed AAC admits significantly more traffic compared to other available admission control schemes thereby guaranteeing high network utilization while maintaining the desired QoS.

关键词： Adaptive control systems

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Adaptive admission control of multimedia traffic in high-speed networks

Adaptive admission control of multimedia traffic in high-spe...

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IEEE International Symposium on Intelligent Control (ISIC)

作者： S. Jagannathan A. Tohmaz A. Chronopoulos H.G. Cheung Embedded Systems and Networking Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO USA Parallel and Distributed Systems Lab Department of Computer Science University of Texas-San Antonio TX USA

This paper proposes a novel real-time adaptive admission control (AAC) scheme with a desired quality of service (QoS) guarantee and high network utilization in high speed networks. The QoS is given in terms of service delay, which is defined as the time it takes for a source to get admitted into the network after it initiates its intended request, packet/cell losses, and transmission delay (time taken to complete transmission from its initiation). AAC uses the following information - the available capacity from a novel adaptive bandwidth estimation scheme, a congestion indicator derived from a congestion controller, peak cell rate estimate from new sources, along with the desired QoS metrics, and outputs an 'admit' or 'reject' decision signal to the new sources while guaranteeing QoS and network utilization. Simulation results are presented by streaming ON/OFF and video data into the network. Results show that the proposed AAC admits significantly more traffic compared to other available admission control schemes thereby guaranteeing high network utilization while maintaining the desired QoS.

关键词： Programmable control Adaptive control Admission control Communication system traffic control High-speed networks Quality of service Delay effects Propagation losses Bandwidth Streaming media

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Haptic control of a mobile robot: A user study

Haptic control of a mobile robot: A user study

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2002 IEEE/RSJ International Conference on Intelligent Robots and systems

作者： Lee, Sangyoon' Sukhatme, Gaurav S. Kim, Gerard Jounghyun Park, Chan-Mo Virtual Reality Laboratory Dept. of Comp. Sci. and Eng. Pohang Univ. of Sci. and Technol. Pohang Kyoungbuk 790-784 Korea Republic of Robotic Embedded Systems Lab. Dept. of Computer Science University of Southern California Los Angeles CA 90089-0781 United States

We address the problem of teleoperating a mobile robot using shared autonomy: an on-board controller performs obstacle avoidance while the operator uses the manipulandum of a haptic probe to designate the desired speed and rate of turn. Sensors on the robot are used to measure obstacle range information. We describe a strategy to convert such range information into forces, which are reflected to the operator's hand, via the haptic probe. This haptic information provides feedback to the operator in addition to imagery from a front-facing camera mounted on the mobile robot. Extensive experiments with a user population show that the added haptic feedback significantly improves operator performance in several ways (reduced collisions, increased minimum distance between the robot and obstacles) without a significant increase in navigation time.

关键词： Mobile robots

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