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2004 7th International Conference on Solid-State and Integrated Circuits Technology Proceedings, ICSICT 2004

作者： Quan, Wu-Yun Baek, Chang-Ki Kim, Dae M. Gang, Ruan Huang, Yiping ASIC and System State-Key Research Lab. Department of Microelectronics Fudan University 220 Handan-road 200433 Shanghai China School of Electrical Engineering and Computer Science ISRC Seoul National University Kwanak P.O. Box 34 Seoul 151-744 Korea Republic of Korea Institute for Advanced Study 207-43 Cheongryangri Seoul Korea Republic of

Presented herein is an efficient simulation technique enabling systematic investigation of the soft programming over-erased flash EEPROM cells. The simulation provides a method by which to find the optimal soft programming technique for given current. The method requires only the cell performance data and allows investigation of the soft programming under various bias conditions. In principle, the methodology can also be used to investigate the programming and erase operations. © 2004 IEEE.

关键词： Flash memory

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Sparse controller realisation with small roundoff noise

Sparse controller realisation with small roundoff noise

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作者： Li, G. Wu, J. Chen, S. Sch. of Elec./Electron. Engineering Nanyang Technological University Singapore 639798 Natl. Key Lab. Indust. Contr. T. Inst. of Advanced Process Control Zhejiang University Hangzhou 310027 China Sch. of Electron./Computer Science University of Southampton Highfield Southampton SO17 1BJ United Kingdom

The effect of roundoff noise in a digital controller is analysed for a digital feedback control system. An analytical expression for the roundoff noise gain, defined as the ratio between the variances of the output error and the rounding error, is obtained. The problem of identifying the minimum roundoff noise realisations can be solved using an existing procedure. Noting that the optimal realisations are fully parametrised, based on a polynomial operator approach a new sparse controller realisation is derived. This realisation is a generalisation of the direct forms in the classical shift operator and the prevailing delta-operator. It provides more degrees of freedom with which to reduce the roundoff noise. The problem of finding optimal polynomial operators can be solved by an exhaustive search, and a design example is given. It is shown that with the proposed sparse realisation the optimal polynomial operators can outperform the shift- and delta-operators.

关键词： Discrete time control systems

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Erratum: Sensorless Speed Measurement of AC Machines Using Analytic Wavelet Transform (IEEE Transaction on Industry Apllications (Sept./Oct. 2002) 38 (1344-1350))

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IEEE Transactions on Industry Applications 2004年第1期40卷 202-202页

作者： Aller, Jose M. Habetler, Thomas G. Harley, Ronald G. Tallam, Rangarajan M. Lee, Sang Bin Departamento de Conversión Univ. Simón Bolívar Caracas 1080-A Venezuela Sch. of Elec./Computer Engineering Georgia Institute of Technology Atlanta GA 30332 United States Advanced Technologies Laboratories Rockwell Automation Milwaukee WI 53201 United States Electromech. Ener. Conversion Lab. Gen. Elec. Corp. Res./Development Niskayuna NY 12309 United States

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Resource Volume Management for Shared File System in SAN Environment 16

Resource Volume Management for Shared File System in SAN Env...

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16th International Conference on Parallel and Distributed Computing Systems, PDCS 2003

作者： Lim, Seung-Ho Hwang, Joo Young Kim, Kyung Ho Lee, Jupyung Park, Kyu Ho Computer Engineering Research Lab EECS Korea Advanced Institute of Science and Technology Taejon Korea Republic of

ISBN: (纸本)9781618398161

In this paper, a volume management scheme that supports multi-host environments is designed and implemented. The proposed scheme provides various features for enterprise internet services such as online resizing, online migration and an enhanced configuration scheme considering workload access patterns and disk geometry. The SANfs is a shared file system in which multiple hosts can share multiple disks via a storage area network (SAN). SANfs is designed to provide high storage I/O performance and reliability to support the intemet web server, but various features of SANfs are limited by traditional storage management technology;therefore, a volume management scheme for SANfs is required. The designed volume manager in this paper, called SANfs-V M, can maximize the performance of SANfs and provide SANfs with high storage volume scalability and availability. It can provide SANfs with maximum system uptime and unlimited storage capacity using online resizing management. SANfs-VM can also provide the opportunity to use the disk characteristics and access pattems of system workloads by utilizing an enhanced configuration scheme. © PDCS 2003. All rights reserved.

关键词： Storage management

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A real-time disk scheduler for multimedia integrated server considering the disk internal scheduler

A real-time disk scheduler for multimedia integrated server ...

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International Parallel and Distributed Processing Symposium, IPDPS 2003

作者： Kim, Kyung Ho Hwang, Joo Young Lim, Seung Ho Cho, Joon Woo Park, Kyu Ho Computer Engineering Research Lab. EECS Korea Advanced Institute of Science and Technology Korea Republic of

ISBN: (纸本)0769519261

The SCSI or the fibre channel (FC) disk drive, called SCSI-FC disk drive has its own internal queue and internal scheduler which maximize its own throughput. The request service order scheduled by the block device drive in Linux is changed by the disk internal scheduler (DIS) and we call this reordering. The conventional real-time disk schedulers are based on Linux block device driver, and the deadlines of the real-time requests are not guaranteed by the reordering of the DIS. This paper proposes a real-time disk scheduling architecture on Linux which solves the reordering problem. It consists of the global scheduler and the local scheduler. The global scheduler selects the real-time requests, predicts their disk I/O times and determines the order based on the spatial locality. The local scheduler is the DIS controlled by the SCSI-FC device driver. The device driver notifies the DIS that the real-time requests with the earlier deadlines must be served before those with the later deadlines. The local scheduler feeds back the measured disk service time to the global scheduler when a requested disk service completes. We have implemented the proposed multimedia disk scheduler on Linux, and the experimental results show that the deadline misses of periodic requests can be reduced up to 19 times (94.7%) by the proposed method. © 2003 IEEE.

关键词： Linux

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i2SCSI: Intelligent iSCSI Disk Providing Cache Consistency in TCP/IP-based Storage Area Network 16

i2SCSI: Intelligent iSCSI Disk Providing Cache Consistency i...

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16th International Conference on Parallel and Distributed Computing Systems, PDCS 2003

作者： Lee, Jupyung Hwang, Joo Young Lim, Seung-Ho Park, Kyu Ho Computer Engineering Research Lab EECS Korea Advanced Institute of Science and Technology Taejon Korea Republic of

ISBN: (纸本)9781618398161

The internet SCSI(iSCSI)[6] disk has been studied as a storage system which can be directly connected to TCP/IP network. We designed and implemented a shared disk following the iSCSI protocol and providing cache consistency. It is named as intelligent iSCSI (i2SCSI) disk. The i2SCSI disk is developed to extend SANfs[2] over TCP/IP-based storage area network and solve the problem of managing a file lock in a centralized lock server by distributing lock manager over the disks. The i2SCSI disk provides cache consistency of all blocks that belong to the disk using a conventional cache consistency method. Due to the limitation of memory size inside disk, file-level locking is hard to implement in the i2SCSI disk. Instead, the i2SCSI disk uses 'contiguous blocks-level locking'. By doing so, memory utilization becomes smaller. A read lock is not required in the i2SCSI disk, which enhances read performance. The prototype of the i2SCSI disk and its client is designed and implemented in Linux 2.4. The experimental environment for the i2SCSI is set up on Linux cluster and performance of the i2SCSI disk is evaluated in the environment. Microbenchmark results show the effect of lock conflict on read/write latency and realistic workload test results show the effect of lock unit size on overall performance. © PDCS 2003. All rights reserved.

关键词： Locks (fasteners)

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New model-based HMM distances with applications to run-time ASR error estimation and model tuning 8

New model-based HMM distances with applications to run-time ...

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8th European Conference on Speech Communication and Technology, EUROSPEECH 2003

作者： Huang, Chao-Shih Lee, Chin-Hui Wang, Hsiao-Chuan Advanced Research Product Value Lab. Acer Inc. Tao-Yuan Taiwan School of Electrical and Computer Engineering Georgia Institute of Technology AtlantaGA United States Department of Electrical Engineering National Tsing Hua University Hsin-Chu Taiwan

We propose a novel model-based HMM distance computation framework to estimate run-time recognition errors and adapt recognition parameters without the need of using any testing or adaptation data. The key idea is to use HMM distances between competing models to measure the confusability between phones in speech recognition. Starting with a set of simulated models in a given noise condition, the corresponding error rate could be estimated with a smooth approximation of the error count computed form the set of phone distances without using any testing data. By minimizing the estimated error between the desired and simulated models, the target model parameters could also be adjusted without using any adaptation data. Experimental results show that the word errors, estimated with the proposed framework, closely resemble the errors obtained by running actual recognition experiments on a large testing set in a number of adverse conditions. The adapted models also gave better recognition performances than those obtained with environment-matched models, especially in low signal-to-noise conditions.

关键词： Errors

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Sensorless performance optimization of single-phase induction motors

Sensorless performance optimization of single-phase inductio...

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International Conference on Power Electronics and Drive Systems (PEDS)

作者： S. Vaez-Zadeh A. Payman Advanced Motion Systems Research Lab Department of Electrical and computer Engineering University of Tehran Tehran Iran

Single-phase induction motors suffer from low torque average and high torque pulsations. These problems can be overcome by a switching capacitor in series with the stator auxiliary winding. However, the switching of the capacitor requires the motor speed signal over the entire speed range to provide performance optimization in terms of high torque average and low torque pulsations. In this paper a simple speed estimation method for single-phase induction motors is proposed in the stationary reference frame to overcome the problems associated with the use of speed sensors. Based on this method, a sensorless torque optimization system is suggested. The system is then validated by extensive simulation results. The speed estimation method was used in the sensorless control of the motors.

关键词： Induction motors Torque Capacitors Equations Stator windings Switches Optimization methods Costs Equivalent circuits Rotors

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A case study on the comparison of non-parametric spectrum methods for broken rotor bar fault detection

A case study on the comparison of non-parametric spectrum me...

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Annual Conference of Industrial Electronics Society

作者： B. Ayhan Mo-Yuen Chow H.J. Trussell Myung-Hyun Song Advanced Diagnosis and Control Lab Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA Department of Electrical Control Engineering Sunchon University Cheonanshi South Korea

Broken rotor bars in an induction motor create asymmetries and result in abnormal amplitude of the sidebands around the fundamental supply frequency and its harmonics. Applying a spectrum analysis technique on motor current and inspecting the spectrum amplitudes at the broken rotor bar specific frequencies for abnormality is a well-known procedure for broken rotor bar fault detection and diagnosis. Among the spectrum analysis techniques for broken rotor bar fault detection, the fast Fourier transform (FFT) is the most widely used technique. There are other spectrum techniques, which are based on the power spectral density estimates. In this paper we compare the three well-known spectrum analysis methods: FFT, periodogram and Welch's periodogram methods according to their performance on the broken rotor bar fault detection problem. The results indicate that Welch's periodogram method has better fault discrimination capability and is more robust compared to the other two methods. A statistical hypothesis test applied to the results of the three methods depicts the comparison results quantitatively.

关键词： Fault detection Rotors Frequency Bars Induction motors Fault diagnosis Fast Fourier transforms Performance analysis Robustness Testing

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Constructing sparse realisations of finite-precision digital controllers based on a closed-loop stability related measure

Constructing sparse realisations of finite-precision digital...

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作者： Wu, J. Chen, S. Li, G. Chu, J. Natl. Lab. Indust. Contr. Technol. Inst. of Advanced Process Control Zhejiang University Hangzhou 310027 China Dept. of Electron./Computer Science University of Southampton Highfield Southampton SO17 1BJ United Kingdom Sch. of Elec./Electronic Engineering Nanyang Technological University Singapore Singapore

The authors present a study of the finite word length (FWL) implementation for digital controller structures with sparseness consideration. A closed-loop stability related measure is derived, taking into account the number of trivial elements in a controller realisation. A practical design procedure is presented, which first obtains a controller realisation that maximises a lower bound of the proposed measure, and then uses a stepwise algorithm to make the realisation sparse. Simulation results show that the proposed design procedure yields computationally efficient controller realisations with an enhanced FWL closed-loop stability performance.

关键词： Digital control systems

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