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International Conference on Networking, architecture, and Storage (NAS)

作者： Ge Zhang Xu Yang Yiwei Zhang Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy and Sciences Beijing China Department of Information and Technology University of International Relations UIR Beijing China

In modern high performance microprocessors, multi-ported register-files are commonly used and critical in both performance and energy consumption. As capability and issue width of register-file grows, its energy consumption increases rapidly. Much prior work about energy-efficient register-file design is focusing on various low levels except for architecture level. In this paper, an accurate architectural level energy model for register-file is proposed and verified, based on which some efficient and practical improvements are presented to save energy without changing the internal circuits or structure of register-file. We implemented a full-customized 64-bit width 64-entry depth physical register-file with 8 read ports and 4 write ports, whose power is as low as 20 mW, in a 1 GHz 4-issue out-of-order 64-bit MIPS microprocessor, Godson-2 [1], using 90 nm CMOS process. 56.0% of reading energy and 20.3% of writing energy can be saved.

关键词： Circuits computer architecture Energy consumption Microprocessors Registers Energy efficiency Out of order CMOS process Writing Semiconductor device modeling

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Maximize Lifetime of Heterogeneous Wireless Sensor Networks with Joint Coverage and Connectivity Requirement

Maximize Lifetime of Heterogeneous Wireless Sensor Networks ...

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International Conference on Scalable Computing and Communications;International Conference on Embedded Computing, SCALCOM-EMBEDDEDCOM

作者： Yu Gu Yusheng Ji Baohua Zhao Department of Computer Science University of Science and Technology Hefei Anhui China Information Systems Architecture Science Research Division National Institute of Information Tokyo Japan

In this paper, we address the problem of lifetime maximization under coverage and connectivity requirements for heterogeneous wireless sensor networks where different targets need to be covered (sensed ) by different types of wireless sensors running at possibly different sampling rates as well as different initial energy reserve. The problem is particularly challenging since we need to consider both connectivity requirement and so-called target Q-coverage requirement, i.e., different targets may require different sensing quality in terms of the number of transducers, sampling rate, sensing data rate, etc. In this paper, we formulate a lifetime maximization problem, which is general and allows unprecedented diversity in coverage requirements, sampling rates, transmission energy consumption models, communication ranges, and target sensing ranges. Our approach is based on column generation, where a column corresponding to a feasible solution; our idea is to find a column with steepest ascent in lifetime, based on which we iteratively search for the maximum lifetime solution. Through extensive simulations, we systematically study the effect of sampling rates, transmission energy consumption models, communication ranges, and target sensing ranges on the lifetime.

关键词： Wireless sensor networks Sampling methods Sensor systems Monitoring Image sensors Embedded computing Magnetic sensors computer networks Sensor phenomena and characterization Transducers

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Multi-objective particle swarm optimization algorithm for engineering constrained optimization problems

Multi-objective particle swarm optimization algorithm for en...

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IEEE International Conference on Granular Computing (GRC)

作者： Dekun Tan Wenhai Luo Qing Liu Department of Computer Science & Technology Nanchang Institute of Technology Nanchang Jiangxi China Department of Civil Engineering & Architecture Nanchang Institute of Technology Nanchang Jiangxi China School of Information Engineering University of Nanchang Nanchang Jiangxi China

This paper proposes a modified particle swarm optimization algorithm for engineering optimization problems with constraints, in which the penalty function is employed to the traditional PSO algorithm, and at the same time adjusts the personal optimum and global optimum to make PSO being able to solve the non-linear programming problems, then the multi-objective problem can be converted into single objective problem. Moreover, the constraint term played its role in the process of generating particles, those pariticles which don't meet the constraint condition are eliminated. The actual engineering design optimization problem is tested and the results show that the multi-objective particle swarm optimization algorithm can be used to solve the multi-objective constrained optimization problem. Comparison with Genetic Algorithm confirms that the proposed algorithm can find better solutions, and converge quickly.

关键词： Particle swarm optimization Constraint optimization Design optimization Design engineering Functional programming Mathematical model Space exploration Iterative algorithms Testing Genetic algorithms

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A two-step method for estimating the parameters of induction machine models

A two-step method for estimating the parameters of induction...

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IEEE Energy Conversion Congress and Exposition, ECCE

作者： Christopher Laughman Steven B. Leeb Leslie K. Norford Steven R. Shaw Peter R. Armstrong Mitsubishi Electric Research Laboratories Inc. Cambridge MA USA Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA Department of Architecture Massachusetts Institute of Technology Cambridge MA USA Department of Electrical and Computer Engineering Montana State University Bozemon MT USA Masdar Institute of Science and Technology Abu Dhabi UAE

ISBN: (纸本)9781424428922

This paper describes and demonstrates a mathematical algorithm that can monitor the physical parameters of the motor solely by observing the stator electrical currents. This method uses measurements of transient stator currents to identify the parameters of an electromechanical model of the induction motor. These parameters are obtained from a relatively poor initial guess, which is constrained only to be within an order of magnitude of the physical parameters, by using a two-step strategy based upon nonlinear least-squares regression techniques. This makes the approach in this paper useful for diagnostic monitoring and energy scorekeeping. Experimental results are presented which demonstrate the effectiveness of this method on identifying the parameters of a 1 HP induction motor connected to a squirrel cage fan in an air-handling unit.

关键词： Parameter estimation Induction machines Condition monitoring Paper technology Induction motors Current measurement Sensor arrays Velocity measurement Voltage Hardware

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Analysis and Design of the College computer-Aided Instruction System Based on CAI and ICAI's

Analysis and Design of the College Computer-Aided Instructio...

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International Workshop on Education technology and computer Science, ETCS

作者： Minghai Yu Huan Zhang Bo Zhou College of textile & garment Guangzhou University Guangzhou China Computer Department Chengdu University of Information and Technology Chengdu China College of Architecture and Environment Sichuan University Chengdu China

This paper introduced and described the status quo and goal of current Chinese colleges and universities computer assistant teaching systems from many aspects, such as explore the background, design goal, information ... 详细信息

关键词： computer aided instruction Educational institutions Writing Educational technology Courseware computer science education Information technology Application software computer networks Computational modeling

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Parallelization of the nearest-neighbour search and the cross-validation error evaluation for the kernel weighted k-nn algorithm applied to large data dets in matlab

Parallelization of the nearest-neighbour search and the cros...

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International Conference on High Performance Computing & Simulation (HPCS)

作者： Gines Rubio Alberto Guillen Hector Pomares Ignacio Rojas Ben Paechter Peter Glosekotter C. I. Torres-Ceballos Department of Computer Architecture and Technology University of Granada Granada Spain Centre of Emergent Computing School of Computing Napier University UK Department of Electrical Engineering and CS University of Applied Sciences Muenster Germany

The kernel weighted k-nearest neighbours (KWKNN) algorithm is an efficient kernel regression method that achieves competitive results with lower computational complexity than least-squares support vector machines and Gaussian processes. This paper presents the parallel implementation on a cluster platform of the sequential KWKNN implemented in Matlab. This implies both the parallelization of the k nearest-neighbour search and the evaluation of the cross-validation error on a large distributed data set. The results demonstrate the good performances of the implementation.

关键词： Kernel Concurrent computing Clustering algorithms Gaussian processes Function approximation Support vector machines Computational efficiency Least squares approximation computer errors computer architecture

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Dynamic application of slicing technique in grid calling and network resources

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WSEAS Transactions on Circuits and Systems 2009年第1期8卷 73-83页

作者： Wang, Lixia Yang, Aimin Li, Yaohui Gao, Liting Liu, Tieying Department of Computer Science Hebei Institute of Architecture and Civil Engineering No.33 Jianguo Road Zhang Jiakou City Hebei Province China Computer Science and Information Technology College Zhejiang Wanli University No.8 South Qian Hu Road Ningbo Zhejiang Province China HebeiCAIDA Securities Co Ltd China

The grid links all resources in different structures widespread geographically into one logical system via internet, characterized with complexity of network structure, dynamism of network resources and autonomy of each LAN. The high-efficient management of grid resources and high-efficient scheduling of tasks are the important contents in today's net grid research. Slices technology is the present quite popular popular technology, the application domain is widespread. The grid technology and the slice technology fuse in together, may create the more reasonable task scheduling and the scheduling of resources. In this article we divide the tasks into some small tasks assigned with scheduling priorities for each level, and then slice all resources in network into some time slices assigned with resource priorities according to trust mechanism. It promotes the effectiveness and high-efficiency by arranging task scheduling and resource scheduling in priority.

关键词： Grid computing

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Introducing residual errors in accuracy assessment for remotely sensed change detection

Introducing residual errors in accuracy assessment for remot...

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International Colloquium on Signal Processing & Its Applications, CSPA

作者： Mohamad Zamani Zainal Abiden Siti Z. Z. Abidin Department of Surveying Sciences & Geomatic Faculty of Architecture Planning & Surveying University Technology MARA Shah Alam Selangor Darul Ehsan Malaysia Department of Computer Science Faculty of Information Technology and Quantitative Sciences University Technology MARA Shah Alam Selangor Darul Ehsan Malaysia

Accuracy assessment for map comparison is commonly found in urban planning research, especially for detecting error in remotely sensed imagery data. It is to compare two sources of spatial information. In analyzing such information quantitatively, the two datasets are summarized in a confusion matrix, which is represented in a form of percentage of predicted value against its actual data (ground truth). The common acceptable percentage is eighty percent and above. In this paper, we present a new way of accuracy assessment by introducing an additional value called residual error (or predicted error). The residual error is the percentage of error exists when two sources of major errors called mis-classification and mis-location are integrated. Such residual error is incorporated into the assessment so that the results are more accurate and comprehensive. As a case study, we calculate the residual errors of five independent image classifications from six different datasets. Therefore, the accuracy assessment is performed with more details that include not only the confusion matrix, but also the residual errors. In this way, the results of the change detection process can help in doing further analysis for urban growth and land development, particularly for town area.

关键词： Urban planning computer errors Information analysis Cities and towns Uncertainty Remote sensing Signal processing Application software computer architecture Process planning

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An electronically controllable dual-mode universal filter using DO-CCCDBAs

An electronically controllable dual-mode universal filter us...

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International Conference on Electrical Engineering/Electronics, computer, Telecommunications and Information technology, ECTI-CON

作者： Somchai Srisakultiew Supawat Lawanwisut Montree Siripruchyanun Department of Computer Engineering Faculty of Engineering and Architecture Rajamangala University of Technology Nakornrajsima Thailand Department of Information and Communication Engineering Faculty of Industrial Technology Thepsatri Rajabhat University Lopburi Thailand Department of Teacher Training in Electrical Engineering Faculty of Technical Education King Mongkut's University of Technology North Bangkok Bangkok Thailand

This article presents a dual-mode (voltage-mode and current-mode) universal biquadratic filter performing completely standard functions: low-pass, high-pass, band-pass, band-reject and all-pass functions, based on dual output current controlled current differencing buffered amplifiers (DO-CCCDBAs). The features of the circuit are that: the bandwidth and pole frequency can be tuned electronically via the input bias currents: the circuit description is very simple, consisting of merely 2 DO-CCCDBAs and 2 capacitors: the circuit can provide either the voltage-mode or current-mode filter without changing circuit topology. Additionally, each function response can be selected by suitably selecting input signals in digital method. Without any external resistor and simple configuration, the proposed circuit is very suitable to further develop into an integrated circuit. The PSPICE simulation results are depicted, the given results agree well with the theoretical anticipation. The maximum power consumption is approximately 1.81 mW at plusmn1.5 V supply voltages.

关键词： Tuned circuits Band pass filters Voltage control Bandwidth Frequency Capacitors Circuit topology Resistors SPICE Circuit simulation

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A novel framework for a unified international system of volcano early warning and hazard tracking

A novel framework for a unified international system of volc...

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International Conference on Recent Advances in Space Technologies (RAST)

作者： F. Guim I. Rodero E. Ozalp E. Chester Computer Architecture Department Technical University Catalunya Barcelona Spain TUBiTAK UZAY Space Technologies Research Institute Scientific and Technological Research Council of TurKey Ankara Turkey CTAE Aerospace Research and Technology Centre Barcelona Spain

While numerous global initiatives exist to address the potential hazards posed by volcanic eruption events and assess impacts from a civil security viewpoint, there is still no single, unified, international system of early warning and hazard tracking for eruptions. Numerous gaps exist in the risk reduction cycle, from data collection, to data processing, and finally dissemination of salient information to relevant parties. As part of the International Space University's Space Studies Program during summer 2008, a detailed gap analysis of the state of volcano disaster risk reduction was undertaken. Using this analysis as a basis, a novel framework to deal with all the identified gaps is proposed as an outcome of this study. This paper presents the principal innovations concerning the data and information processing within this work. The name of the framework was chosen to be VIDA to abbreviate dasiaVolcanic Activity Processing of Observation and Remote Sensing Data Integrated Data-Sharing and Analysispsila. In order to present this framework, it is shown how different high performance computing resources can be orchestrated in order to support fast and efficient tools that would support VIDA in mitigating the risk posed by volcanic eruptions and other natural hazards. Furthermore, how the system could be used by describing different use cases is also presented in this paper.

关键词： Volcanoes Hazards Risk management Data security Information security Data processing Risk analysis Technological innovation Information processing Remote sensing

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