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A non-iterative equivalent waveform model for timing analysis in presence of crosstalk

A non-iterative equivalent waveform model for timing analysi...

引用

IEEE International Symposium on Circuits and systems (ISCAS)

作者： K.K. Muchherla Pinhong Chen J.M. Wang Electrical and Computer Engineering University of Arizona Tucson Tucson USA Cadence Design Systems Santa Clara USA

In the deep sub micron (DSM) regime, due to non-uniform scaling of interconnects, coupling capacitance between wires becomes an increasingly dominant fraction of the total wire capacitance. Crosstalk causes delay variations on signal lines and raises signal integrity problems. Including crosstalk in timing analysis has become imperative for current technologies. Existing timing analysis methods do not consider gate driving capability, output loading effects and waveform shape, and hence are not always accurate. We propose a non-iterative equivalent waveform model that addresses these issues.

关键词： Timing Crosstalk Switches Capacitance Shape Wires Delay Iterative algorithms design engineering systems engineering and theory

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The Stability Analysis of the Coordinated Hybrid Agent Framework

The Stability Analysis of the Coordinated Hybrid Agent Frame...

引用

IEEE International Symposium on Intelligent Control (ISIC)

作者： H. Li F. Karray O. Basir I. Song Department of Electrical and Computer Engineering University of Waterloo Waterloo ONT Canada Department of Systems Design Engineering University of Waterloo Waterloo ONT Canada

The coordinated hybrid agent (CHA) framework for the control of multi-agent systems (MASs) has been used to model both the homogeneous and the heterogeneous multi-agent systems. In this framework, the control of the MASs is regarded as a decentralized control and coordination of agents. The CHA framework is able to implement coordination tasks for multi-agent systems. In this study, the stability of MASs modelled by the CHA framework is studied. Because each CHA can be regarded as a discrete event system (DES), we define the stability of CHA systems in the sense of Lyapunov as a logical DES. The necessary and sufficient conditions for CHA systems are presented

关键词： Stability analysis Control systems Multiagent systems Control system synthesis Distributed control Intelligent control Discrete event systems Process control Weight control design engineering

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A real-time scheduler design for fuzzy logic controller

A real-time scheduler design for fuzzy logic controller

引用

IEEE International Conference on Mechatronics and Automation

作者： I. Song F. Karray H. Li Department of Systems Design Engineering University of Waterloo Waterloo ONT Canada Department of Electrical and Computer Engineering University of Waterloo Waterloo ONT Canada

Multi-tasks design in embedded system develop is often used on real-time OS or interrupt driven environment. The multi-task programming development gives many advantages for developers. However, tasks should be carefully designed and analyzed to guarantee that all concurrently running tasks run without missing timing requirements, also known as deadline. In this research, we investigate different types of real-time scheduling schemes and list their advantages and disadvantages. To be more realistic with real-time scheduling, we performed a real-time kernel simulator and car-like robot and its fuzzy logic control simulator. Based on these simulations we suggest the proper usage of real-time scheduling.

关键词： Fuzzy logic Optimal scheduling Processor scheduling Dynamic scheduling Real time systems Bandwidth Embedded system Robots Timing Kernel

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Modelling haptic devices using a rule-based expert system

Modelling haptic devices using a rule-based expert system

引用

IEEE International Workshop on Haptic, Audio and Visual Environments and Their Applications

作者： M.H. Zadeh E. Kubica Department of Electrical and Computer Engineering University of Waterloo Waterloo ONT Canada Department of Systems Design Engineering University of Waterloo Waterloo ONT Canada

Modelling physical systems is one of the main technical challenges in the field of control systems and haptic devices. In this work, a two part methodology is proposed that generates a model which employs qualitative reasoning to encapsulate nonlinear effects that are often approximated as linear processes. We utilize fuzzy set theory to implement a rule-base that has been constructed from both conventional and expert knowledge to model the nonlinear damping behaviour of the PHANToM/spl trade/ haptic device. Our methodology is used to produce an estimate of the nonlinear parameters in a mathematical model a PHANToM/spl trade/ haptic device integrated with a rate feedback controller. Most estimation methods approximate damping factors using a linear approximation based on experimental data. In the first part of our method, a rule-based expert system is developed based on constant parameters which have been estimated from experimental data (linear model) and the system parameters are tuned for multiple operating regions. The second part of our method develops an expert system using constant parameters based on expert knowledge. Several system responses are examined to show the ability of our technique to capture a variety of conditions.

关键词： Haptic interfaces Expert systems Fuzzy systems Imaging phantoms Human computer interaction Linear approximation Damping Hybrid intelligent systems Application software Stability

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A Case Study of a Real-Time Controller design for a Car-Like Robot System

A Case Study of a Real-Time Controller Design for a Car-Like...

引用

IEEE International Symposium on Intelligent Control (ISIC)

作者： Insop Song F. Karray M.S. Masmoudi Howard Li F. Guedea Department of Systems Design Engineering University of Waterloo Waterloo ONT Canada Department of Electrical Computer Engineering University of Waterloo Waterloo ONT Canada Department of Electrical Engineering and Computer Science ENIS Engineering School Sfax Tunisia Center for Innovation in Design and Technology ITESM Monterrey Nuevo Leon Mexico

In embedded system development, multi-tasks design is often used on real-time OS or interrupt driven environment. The multi-task programming development gives many advantages for developers. However, tasks should be carefully designed and analyzed to grantee that all concurrently running tasks run without missing timing requirements, also known as deadline. In this research, we investigate different types of real-time scheduling schemes and list their advantages and disadvantages. To be more realistic with real-time scheduling, we performed with a real-time kernel simulator and car-like robot and it's fuzzy logic control simulator. Based on these simulation we suggest the proper usage of real-time scheduling

关键词： computer aided software engineering Real time systems Control systems Processor scheduling Dynamic scheduling Embedded system Fuzzy logic Robot programming Timing Kernel

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Enhancement of Carrier-Based Modulation Strategies for Multilevel Converters

Enhancement of Carrier-Based Modulation Strategies for Multi...

引用

Annual IEEE Conference on Power Electronics Specialists (PESC)

作者： J. Pou P. Rodriguez J. Zaragoza V. Sala C. Jaen D. Boroyevich Departments of Electronic and Electrical Engineering Power Quality and Renewable Energy (QuPER) Research Group Technical University of Catalonia Spain Departments of Electronic and Electrical Engineering Research Group Terrassa Catalonia SPAIN Department of Electrical and Computer Engineering Center for Power Electronics Systems (CPES) Virginia Polytechnic Institute and State University Blacksburg VA USA Department of Electrical and Computer Engineering Center for Power Electronics Systems (CPES) Blacksburg VA USA

Carrier-based modulation strategies can be improved by inclusion of zero sequences in the modulation signals. In this paper, the modulation signals of a three-level neutral-point-clamped converter are modified to achieve maximum benefit of the DC-link voltage, and to help achieve voltage balance between the DC-link capacitors. The proposed strategy is obtained from the analysis of space-vector modulation patterns. Therefore, compared to standard sinusoidal PWM, 15% larger amplitudes of the output voltage fundamentals, better voltage-balancing performance, and lower switching frequencies in the devices can all be achieved. Furthermore, implementation of this modulation technique in a digital-signal processor is much easier than space-vector modulation, and also lowers processing time requirements. Efficiency of the modulation algorithm is verified by simulation and experiment

关键词： Voltage Pulse width modulation Support vector machines Capacitors Digital modulation Pulse width modulation converters Pattern analysis Switching frequency Sampling methods Field programmable gate arrays

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Automatic selection of DBS target points using multiple electrophysiological atlases

Automatic selection of DBS target points using multiple elec...

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8th International Conference on Medical Image Computing and computer-Assisted Intervention - MICCAI 2005

作者： D'Haese, Pierre-Francois Pallavaram, Srivatsan Niermann, Ken Spooner, John Kao, Chris Konrad, Peter E. Dawant, Benoit M. Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN United States Université Catholique de Louvain Louvain-la-Neuve Belgium Departments of Neurosurgery Vanderbilt Medical Center Nashville TN United States Departments of Radiology Vanderbilt Medical Center Nashville TN United States Sentient Medical Systems Cockeysville MD 21030

ISBN: (纸本)3540293264

In this paper we study and evaluate the influence of the choice of a particular reference volume as the electrophysiological atlas on the accuracy of the automatic predictions of optimal points for deep brain stimulator (DBS) implants. We refer to an electrophysiological atlas as a spatial map of electrophysiological information such as micro electrode recordings (MER), stimulation parameters, final implants positions, etc., which are acquired for each patient and then mapped onto a single reference volume using registration algorithms. An atlas-based prediction of the optimal point for a DBS surgery is made by registering a patient's image volume to that reference volume, that is, by computing a correct coordinate mapping between the two;and then by projecting the optimal point from the atlas to the patient using the transformation from the registration algorithm. Different atlases, as well as different parameterizations of the registration algorithm, lead to different and somewhat independent atlas-based predictions. We show how the use of multiple reference volumes can improve the accuracy of prediction by combining the predictions from the multiple reference volumes weighted by the accuracy of the non-rigid registration between each of the corresponding atlases and the patient volume. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Medical imaging

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Equalizing data-path for processing speed determination in block level pipelining

Equalizing data-path for processing speed determination in b...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： Xiaoyao Liang A. Athalye Sangjin Hong Mobile Systems Design Laboratory Department of Electrical and Computer Engineering Stony Brook University-SUNY Stony Brook NY USA

Signal processing algorithms represented by data flow graphs can be efficiently mapped to hardware using a block level pipelining architecture. In this scheme, nodes of data flow are mapped to processing blocks and buffers are inserted in between as pipelining elements. We present, in this paper, a methodology for equalizing execution times of various nodes in the data path. The method is used to minimize the power dissipation and buffer usage by judiciously selecting the execution speed of hardware units. The block level pipelining allows for simple local controllers for each buffer which are generated by the global controller based on data flow specifications. The evaluation of the methodology on a practical example is presented.

关键词： Pipeline processing Communication system control Signal processing algorithms Control systems Hardware Centralized control Frequency synchronization Distributed control Mobile computing Laboratories

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AES crypto chip utilizing high-speed parallel pipelined architecture

AES crypto chip utilizing high-speed parallel pipelined arch...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： D. Kotturi Seong-Moo Yoo J. Blizzard Cadence Design Systems Plano TX USA Electrical and Computer Engineering Dept University of Alabama Huntsville Huntsville AL USA

In November 2001, the National Institute of Standards and Technology (NIST) of the USA chose the Rijndael algorithm as the suitable Advanced Encryption Standard (AES) to replace the Data Encryption Standard (DES) algorithm. Since then, many hardware implementations have been proposed in literature. We present a hardware-efficient design increasing throughput for the AES algorithm using a high-speed parallel pipelined architecture. By using an efficient inter-round and intra-round pipeline design, our implementation achieves a high throughput of 29.77 Gbit/s in encryption whereas the highest throughput reported in the literature is 21.54 Gbit/s.

关键词： Cryptography Throughput Algorithm design and analysis NIST Hardware Data security National security computer architecture Pipeline processing Field programmable gate arrays

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Dynamic coarse grain dataflow reconfiguration technique for real-time systems design

Dynamic coarse grain dataflow reconfiguration technique for ...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： Xiaoyao Liang A. Athalye Sangjin Hong Mobile Systems Design Laboratory Department of Electrical and Computer Engineering Stony Brook University-SUNY Stony Brook NY USA

The paper explores a reconfigurable platform design methodology for high throughput execution of data centric applications. The reconfiguration platform consists of heterogenous processing elements and buffers interacting through reconfigurable interconnects. The proposed platform is based on block level pipelining with the buffers and their respective controllers forming the pipelining elements. We discuss the dynamic and partial reconfiguration techniques of this platform. Specifically, reconfiguration overhead at runtime is illustrated.

关键词： Real time systems Switches Integrated circuit interconnections computer architecture Pipeline processing Reconfigurable architectures design methodology Throughput Digital signal processing Parallel processing

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