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检索条件"任意字段=Applied Computing 2004 - Proceedings of the 2004 ACM Symposium on Applied Computing"

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Battery-efficient task execution on portable reconfigurable computing

Battery-efficient task execution on portable reconfigurable ...

引用

IEEE International SOC Conference

作者： B. Sethuraman J. Khan R. Vemuri Department of ECECS University of Cincinnati Cincinnati OH USA

We present a battery-efficient task execution methodology for portable reconfigurable computing (RC) platforms. We implement a given algorithm with varying power-performance levels: we call these implementations, Cores and each core is characterized in terms of its power and performance levels. Core change and/or the frequency change are the two mechanisms used to vary the battery consumption. We consider two cases for single task execution: one increasing the performance with a battery life constraint and the other prolonging the battery' life with a performance constraint. The execution time of each task is divided into equal time intervals, called slots. A simulated annealing based algorithm is used to find the best constraint-satisfying sequence of cores offline. Our results show a 50% increase in the total work done (case 1) and 61% increase in battery life (case 2), by using this methodology when compared to a system not using it. The combined effect of both cases is applied to a multiple task execution and the results are reported.

关键词： Portable computers Field programmable gate arrays Frequency Batteries Hardware Time factors Annealing Power system modeling Clocks Runtime

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Activation detection in multi-subject studies of fMRI using GLRT

Activation detection in multi-subject studies of fMRI using ...

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IEEE symposium on Nuclear Science (NSS/MIC)

作者： S.M. Shams G.A. Hossein-Zadeh H. Soltanian-Zadeh Control and Intelligent Processing Center of Excellence Electrical and Computer Engineering Department Institute for Studies in Theoretical Physics and Mathematics University of Tehran School of Cognitive Sciences Tehran Iran Control and Intelligent Processing Center of Excellence Electrical and Computer Engineering Department Institute for Studies in Theoretical Physics and Mathematics and Medical Image Analysis Laboratory Henry Ford Health System University of Tehran School of Cognitive Sciences Iran

A new method based on generalized likelihood ratio test (GLRT) for activation detection in multi-subject studies of functional MRI (fMRI) is proposed. In this method, we test the correlation between the fMRI time series of different subjects and the bases of a signal subspace which increases the flexibility of method in detecting different shapes of hemodynamic response. The proposed multivariate method can be applied to group studies where the conventional cross-correlation method cannot be used due to its univariate property. This method is applied to both experimental and simulated fMRI data and the results are compared to those of general linear model (GLM). We show that the proposed method detects more significant activated regions in analyzing experimental data and more true voxels in simulated data

关键词： Testing Hemodynamics Brain modeling Process control Intelligent control Physics computing Mathematics Time series analysis Magnetic resonance imaging Data analysis

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Simultaneous estimations of ground target location and aircraft direction heading via image sequence and GPS carrier-phase data

Simultaneous estimations of ground target location and aircr...

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IEEE Conference on Control Technology and Applications (CCTA)

作者： L.K. Wang Shan-Chih Hsieh Fei-Bin Hsaio Kou-Yuan Huang Guo-Shing Huang Fan-Jen Tsai Department of Electrical Engineering National Kaohsiung University of Applied Sciences Kaohsiung Taiwan Institute of Aeronautics and Astronautics National Engineering Kung University Tainan Taiwan Department of Computer and Information Science National Chaio-Tung University Hsinchu Taiwan Department of Electrical Engineering National Chinyi Institute of Technology Taichung Taiwan

An exquisite technique, using both dual GPS carrier-phase receivers' measurements and target image sequence, is proposed to attain the stationary target location on the ground as well as the aircraft heading. Direct solving of integer ambiguity in carrier-phase measurements is avoided, while the differences of the integer ambiguity numbers are incorporated in the states of the proposed statistical filter. The extended Kalman filter (EKF) is utilized to obtain the World Geodetic System-1984 (WGS-84) coordinate of the ground target without using any computation-intensive technique such as optical flow and measurement data error sensitive one like least-squares. A generic carrier-phase data processing technique is employed to calculate the attitude of the aircraft. The proposed filter's performance is verified by utilizing actual GPS carrier-phase measurement data.

关键词： Aircraft Image sequences Global Positioning System Optical filters Data flow computing Optical computing Optical receivers Optical sensors Image motion analysis Coordinate measuring machines

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From massively parallel image processors to fault-tolerant nanocomputers

From massively parallel image processors to fault-tolerant n...

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International Conference on Pattern Recognition

作者： J. Han P. Jonker Quantitative Imaging Group Faculty of Applied Sciences Delft University of Technnology Delft Netherlands

Parallel processors such as SIMD computers have been successfully used in various areas of high performance image and data processing. Due to their characteristics of highly regular structures and mainly local interconnections, SIMD or SIMD-like architectures have been proposed for a large-scale integration of recently developed quantum and nanoelectronic devices. In this paper, we present a fault-tolerant technique suitable for an implementation in nanoelectronics, the triplicated interwoven redundancy (TIR). The TIR is a general class of triple modular redundancy (TMR), but implemented with random interconnections. A prototype structure for an image processor is proposed for the implementation of the TIR technique and a simulation based reliability model is used to investigate its fault-tolerance. The TIR is extended to higher orders, namely, the N-tuple interwoven redundancy (NIR), to achieve higher system reliabilities. It is shown that the reliability of a general TIR circuit is, in most cases, comparable with that of an equivalent TMR circuit, and that the design and implementation of restorative devices (voters) are important for the NIR (TIR) structure. Our study indicates that the NIR (TIR) is in particular suitable for an implementation by the manufacturing process of stochastically molecular assembly, and that it may be an effective fault-tolerant technique for a massively parallel architecture based on molecular or nanoelectronic devices.

关键词： Fault tolerance Redundancy Integrated circuit interconnections Nanoscale devices Concurrent computing High performance computing Data processing Computer architecture Large scale integration Virtual prototyping

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Usability evaluation of distributed groupware in distance learning

Usability evaluation of distributed groupware in distance le...

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International Conference on Information Technology Based Higher Education and Training, ITHET

作者： C.T. Blake L. Rapanotti Institute of Educational Technology Open University UK Computing Department Open University UK

This paper deals with the development of an inspection method for the evaluation of synchronous groupware in e-Learning. Distributed groupware are software applications that are able to facilitate collaboration among groups of people over the Internet. These applications are difficult to evaluate due to presence of multiple users working collaboratively in educational or business settings. Recently researchers have investigated the suitability of inspection methods to complement traditional evaluation techniques. So far, such techniques have been applied primarily to groupware within businesses. In this paper, we look at how some of these techniques could be adapted and extended for the evaluation of groupware in learning.

关键词： Usability Collaborative software Collaborative work Computer aided instruction Inspection Application software Electronic learning Educational technology Internet Laboratories

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TRUMMAR - a trust model for mobile agent systems based on reputation

TRUMMAR - a trust model for mobile agent systems based on re...

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IEEE/ACS International Conference on Pervasive Services (ICPS)

作者： G. Derbas A. Kayssi H. Artail A. Chehab Department of Electrical and Computer Engineering American University of Beirut Beirut Lebanon

We present TRUMMAR, a reputation-based trust model that mobile agent systems can use to protect agents from malicious hosts. TRUMMAR is unique in being a truly comprehensive model since it accounts, in a unified framework for a multitude of concepts such as prior-derived reputation, first impression, loss of reputation information with time, hierarchy of host systems (neighbors, friends, and strangers), and the inclusion of interaction results in reputation calculation. TRUMMAR is also general enough to be applied to any distributed system. We show simulation results that verify the correctness of this model and the effects of its various parameters.

关键词： Mobile agents Biological system modeling Biology computing Computational modeling Protection Local area networks Internet Environmental economics Evolution (biology) Artificial intelligence

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Open laboratory for robotics education

Open laboratory for robotics education

引用

IEEE International Conference on Robotics and Automation (ICRA)

作者： J. Fernandez A. Casals Department of Automatic Control and Computer Engineering Universitat Poliltècnica de Catalunya Barcelona Spain

Laboratories are key components in the learning process of applied matters. The laboratory enables students to acquire methodologies, work habitude, knowledge on equipment operation and experience, in conditions as near as possible to their future professional activity. The evolution of communication and information technologies opens new possibilities in educational methods. The purpose of this paper is to present a Web based system for the implementation of a robotics laboratory with didactic finalities. The laboratory is to be accessible indifferently and simultaneously, in situ or via Internet. The system presented aims at providing access to the laboratory at any time, from everywhere, without space problems, paying special attention to safety requirements. For these reasons we call it an Open laboratory.

关键词： Laboratories Educational robots Robot sensing systems Robot programming Mobile robots Programming profession Orbital robotics Educational programs Computer science education Control engineering computing

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A comparison of junction tree and relaxation algorithms for point matching using different distance metrics

A comparison of junction tree and relaxation algorithms for ...

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International Conference on Pattern Recognition

作者： T.S. Caetano T. Caelli D.A.C. Barone Department of Computing Science University of Alberta Edmonton AB Canada Instituto de Informática UFRGS Porto Alegre Rio Grande do Sul Brazil

We have developed a polynomial time optimal method for a class of attributed graph matching problems using the junction tree algorithm from graphical models. In this paper we compare this method with standard probabilistic relaxation labeling using different forms of point metrics and under different levels of additive noise. Results show that, no matter which of the metrics is applied, our technique is more effective than probabilistic relaxation labeling for large graph sizes. For small graph sizes, our technique is still preferable for two of the metrics, while for the third one both techniques perform similarly.

关键词： Pattern matching Pattern recognition

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FFT snake: a robust and efficient method for the segmentation of arbitrarily shaped objects in image sequences

FFT snake: a robust and efficient method for the segmentatio...

引用

International Conference on Pattern Recognition

作者： Tianqing Li Yi Zhang Danya Yao Dongcheng Hu Department of Automation Tsinghua University Beijing China

ISBN: (纸本)0769521282

A robust and efficient algorithm for segmenting arbitrarily shaped objects in images, which is called FFT snake, is proposed in this paper. A low-pass filter with the fast Fourier transform (FFT) of the curve as theoretic internal force is first introduced to smooth the contours. In real algorithm, it is composed of the curves trimming and crossing chains cutting. At last the contours are evolved in the direction of normal vectors of the curve to match the feature-map. The algorithm is then applied to the rapid video feedback on the motion for the real-time diving training. The results are highly encouraging to capture the contours of arbitrarily shaped objects for real-time tracking systems. We believe that FFT snake has wide uses in video compression, multimedia applications, and so on.

关键词： Robustness Image segmentation Image sequences Active contours Shape Video compression Real time systems Geophysics computing Automation Low pass filters

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Assessment of the requirements management process using a two-stage questionnaire

Assessment of the requirements management process using a tw...

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International Conference on Quality Software

作者： G. Cuevas Al. Serrano Ar. Serrano Facultad de Informática Universidad Politécnica de Madrid Spain Department of Information Systems & Computing Brunei University UK

This research advocates the idea that although requirements management process is not carried out in many organizations, there are some people within the organization that perform some requirements management practices. However, these practices are usually not documented and as consequence are not spread across the organization. This paper proposes an assessment methodology based on a two-stage questionnaire to identify which practices of the requirements management process are performed but not documented, which practices require to be prioritized and which are not implemented due to bad management or unawareness. In order to validate the assessment methodology, the questionnaire was applied to an industrial case study.

关键词： Capability maturity model Software quality Coordinate measuring machines Software development management Software maintenance Best practices Systems engineering and theory Software systems Appraisal Costs

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