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International Conference on computer Engineering and Systems

作者： Mostafa I. Soliman Computer & Control Section Electrical Engineering Department Faculty of Engineering South Valley University Aswan Egypt

ISBN: (纸本)1424413656;9781424413652

This paper proposes new processor architecture to exploit the increasingly number of transistors per integrated circuit and improve the performance of data parallel applications on general-purpose processors. The proposed processor (called Mat-core) is based on the use of multi-level ISA to explicitly communicate data parallelism to processor in a compact way instead of the dynamic extraction using complex hardware or the static extraction using sophisticated complier techniques. Since the fundamental data structures for data parallel applications are scalar, vector, and matrix data, Mat-core extends a scalar core (for executing scalar instructions) with a matrix unit (for executing vector/matrix instructions). Like vector microarchitectures, the extended matrix unit is organized in parallel lanes; each lane contains a pipeline of each functional unit and a slice of the register file. However, the Mat-core processor can effectively process not only vector but also matrix data on the parallel lanes. The increasingly budget of transistors can be exploited to scale the Mat-core processor by providing more cores in a physical package. On a multi-core processor, performance would be improved by parallel processing threads of codes using multi-threading techniques.

关键词： Data mining Application specific integrated circuits Instruction sets Hardware Data structures Microarchitecture Pipelines Registers Packaging Multicore processing

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FULL-MATRIX INVERSE-BASED MIMO QFT control DESIGN FOR SPACECRAFT FLYING IN FORMATION

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IFAC Proceedings Volumes 2007年第7期40卷 165-170页

作者： M. Garcia-Sanz I. Eguinoa S. Bennani Automatic Control and Computer Science Department. Public University of Navarra. Campus Arrosadia 31006 Pamplona Spain Guidance Navigation and Control Section ESA/ESTEC Keplerlaan 1 2201 AZ Noordwijk The Netherlands

This paper introduces a reformulation to design full-matrix Quantitative Feedback Theory (QFT) controllers for multi-input-multi-output (MIMO) plants with model uncertainty. It considers a double-step procedure: an inverse-based decoupling and a consecutive loop-by-loop quantitative robust control design. The method generalizes several previous non-diagonal MIMO QFT techniques, avoiding some required prior hypotheses of such former methods, and simplifies the design procedure. It deals with two classical control problems: reference tracking and disturbance rejection at plant output. The paper ends applying the new technique to the design of a MIMO controller for a spacecraft flying in a formation that is moving with respect to a central body in a circular orbit.

关键词： Robust Multivariable control Formation Flying Satellite control QFT

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An Initial Rotor Position Estimation Method for Switched Reluctance Motor without Using Machine Parameter

An Initial Rotor Position Estimation Method for Switched Rel...

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International Conference on Electrical Machines and Systems 2007(ICEMS2007)(第十届国际电机与系统会议)

作者： K. Tungpimolrut S. Kachapornkul P.Somsiri P. Jitkreeyarn Tadashi Fukao Akira Chiba Industrial Control and Automation Laboratory Section National Electronics and Computer Technology C Department of Electrical Engineering Faculty of Science and Technology Tokyo University of Science

In this paper a method to estimate the initial rotor position of the switched reluctance motor (SRM) at the stand still condition is proposed. The proposed method can be implemented by the simple microcontroller based system, and it is not necessary to know the magnetization curves. The impulse gate drive signal is applied and the winding current is detected and its approximate value is used for calculating the rotor position. The compensation method to reduce the estimation error thorough one cycle is also mentioned. The proposed method is implemented with the 6-stator-pole and 4- rotor-pole, 1.5 kW 3-phase switched reluctance motor.

关键词： Switched reluctance motor initial rotor position estimation

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A Design of 15 kW Switched Reluctance Motor for Electric Vehicle Applications

A Design of 15 kW Switched Reluctance Motor for Electric Veh...

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International Conference on Electrical Machines and Systems 2007(ICEMS2007)(第十届国际电机与系统会议)

作者： P. Jitkreeyarn K. Tungpimolrut S. Kachapornkul P. Somsiri Tadashi Fukao Akira Chiba Industrial Control and Automation Laboratory Section National Electronics and Computer Technology C Department of Electrical Engineering Faculty of Science and Technology Tokyo University of Science

In this paper, a design of the 3-phase, 6-stator-pole and 4-rotor-pole, 15 kW switched reluctance motor for the propulsion system of the electric vehicle is presented. Its performance such as the torque per volume and... 详细信息

关键词： Switched reluctance motor motor design electric vehicle

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Characteristics of transfers to and captures at Europa

Characteristics of transfers to and captures at Europa

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Spaceflight Mechanics 2006 - AAS/AIAA Space Flight Mechnaics Meeting

作者： Lam, Try Hirani, Anil N. Kangas, Julie A. Engineering Staff Guidance Navigation and Control Section Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive Pasadena CA 91109 Department Computer Science University of Illinois at Urbana-Champaign 201 N. Goodwin Avenue Urbana IL 61801

ISBN: (纸本)0877035288

This paper explores the characteristics (i.e. stability and performance) of transfers to, and captures at Europa. We focus on optimal low-thrust transfers from Ganymede to potential science orbits at Europa and compare different capture types, transfer resonances, and thrust accelerations. The two types of capture methods we consider are capture in a distant retrograde orbit (DRO) and capture by targeting a state on a stable invariant manifold of a halo orbit. We show that each type has its advantages and disadvantages. The first part of DRO-type capture may be easier than a halo-type capture in some design schemes because DROs are generally extremely stable. However, halo-type captures using stable invariant manifolds typically result in fewer escapes even when full ephemeris is used. Moreover, changing the inclination to achieve a high inclination science orbit at Europa is much easier in a halo-type capture. We study these trade-offs in this paper.

关键词： Aerospace engineering

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Significance of Pacemaker vs. Non-Pacemaker Neurons in an Excitatory Rhythmic Network

Significance of Pacemaker vs. Non-Pacemaker Neurons in an Ex...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Liston K. Purvis Terrence M. Wright Jeffrey C. Smith Robert J. Butera Laboratory for Neuroengineering Georgia Institute of Technology Atlanta GA USA Department of Biology Emory University Atlanta GA USA Cellular and Systems Neurobiology Section Laboratory of Neural Control NINDS-National Institutes of Health Bethesda MD USA Laboratory for Neuroengineering and School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

This modeling study investigates the functional role of pacemaker neurons in generating stable rhythms in the pre-Botzinger complex, a subcircuit of the respiratory pattern-generating circuitry in mammals. While the presence of pacemakers within the network is without doubt, the percentage and significance of such pacemakers is still unresolved. Here we revisited earlier network simulations by varying the fraction of pacemaker and non-pacemaker neurons within the network, and quantifying the robustness of the input parameter space and range of frequencies output by the network. Stable network rhythms were possible even with no pacemakers. However, we found that a network of at least 50% pacemakers produced the greatest range of output frequencies and had the more robust input space

关键词： Pacemakers Neurons Frequency Rhythm Robustness Circuits Laboratories Neural engineering Cities and towns USA Councils

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A new technique for automatic text categorization for arabic documents

A new technique for automatic text categorization for arabic...

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5th International Business Information Management Association Conference, IBIMA 2005

作者： Mohamed, Samir A. Ata, Walaa Darwish, Nevin Computer and Control Section Faculty of Engineering South Valley Univ. Aswan Egypt Computer Engineering Department Faculty of Engineering Cairo University Cairo Egypt

ISBN: (纸本)0975339346

Due to the wide spread of Arabic documents on the Internet, it becomes an urgent necessity to build systems that manipulate Arabic documents. In this paper, we propose a new technique of an Automatic Text Categorization (ATC) for Arabic documents based on a light stemming algorithm;which removes suffixes and prefixes from words. Despite the complexity of Arabic language, our technique shows a very significant F-measure varying between 0.85 and 0.987 with an average of 0.955. The obtained results are like those for the well-studied English language using the best ATC techniques including Support Vector Machines.

关键词： Text processing

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Special section on manoeuvering control of marine craft

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control ENGINEERING PRACTICE 2003年第4期11卷 413-414页

作者： Blanke, M Poursanjani, MMA Vukic, ZZ Section of Automation at Oersted Technical University of Denmark DTU Elektrovej Building 326 2800 Lyngby Denmark Southampton Institute East Park Terrace SO14 0YN Southampton UK Department of Control and Computer Engineering University of Zagreb Unska 3 10000 Zagreb Croatia

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Suppressing shock waves on the A1 in The Netherlands - Model calibration and model-based predictive control

Suppressing shock waves on the A1 in The Netherlands - Model...

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2003 IEEE International Conference on Intelligent Transportation Systems, ITSC 2003

作者： Hegyi, A. Duy, D.N. De Schutter, B. Hellendoorn, J. Hoogendoorn, S.P. Stramigioli, S. Delft Center for Systems and Control Delft Univ. of Technology Mekelweg 2 Delft2628 CD Netherlands Transportation Planning and Traffic Engineering Section Fac. Civil Eng. and Geosciences Delft Univ. of Technology P.O. Box 5048 Delft2600 GA Netherlands Control Laboratory EL/CE Fac. of Electrical Eng. Mathematics and Computer Science Univ. of Twente P.O. Box 217 Enschede7500 AE Netherlands

ISBN: (纸本)0780381254

We now apply the model predictive control (MPC) of speed limits that we have presented in previous publications to a calibrated METANET model of a 19 km stretch of the real-world freeway A1 in The Netherlands. This freeway regularly suffers from shock waves originating mainly from on-ramps, and speed limits are now used to suppress these shock waves. First, we calibrate and validate the extended METANET model with data from the A1 freeway, and we use the Delft OD method to estimate the origin-destination patterns that are needed for the simulation of the destination oriented traffic. Next, we verify from data whether the necessary conditions for applying speed limits against shock waves are satisfied. We show that the MPC controller performs well even under the assumption that the traffic demand is not known on the on-ramps and is known for only a few kilometers upstream and downstream of the controlled stretch. This approach results in an improvement of the total time spent in the network with about 15%. © 2003 IEEE.

关键词： Shock waves

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3-D flame temperature field reconstruction with multiobjective neural network

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Chinese Optics Letters 2003年第2期1卷 78-81页

作者：万雄高益庆汪元美 Institute of Automation of Nanjing University of Aeronautics and Astronautics Nanjing 210016 Department of Test and Control Engineering Nanchang Institute of Aeronautical Technology Nanchang 330034 Department of Test and Control Engineering Nanchang Institute of Aeronautical Technology Nanchang 330034 Department of Test and Control Engineering Nanchang Institute of Aeronautical Technology Nanchang 330034 novel 3-D temperature field reconstruction method is proposed in this paper which is based on multi-wavelength thermometry and Hopfield neural network computed tomography. A mathematical model of multi-wavelength thermometry is founded and a neural network algorithm based on multiobjective optimization is developed. Through computer simulation and comparison with the algebraic reconstruction technique (ART) and the filter back-projection algorithm (FBP) the reconstruction result of the new method is discussed in detail. The study shows that the new method always gives the best reconstruction results. At last temperature distribution of a section of four peaks candle flame is reconstructed with this novel method.

A novel 3-D temperature field reconstruction method is proposed in this paper, which is based on multi-wavelength thermometry and Hopfield neural network computed tomography. A mathematical model of multi-wavelength thermometry is founded, and a neural network algorithm based on multiobjective optimization is developed. Through computer simulation and comparison with the algebraic reconstruction technique (ART) and the filter back-projection algorithm (FBP), the reconstruction result of the new method is discussed in detail. The study shows that the new method always gives the best reconstruction results. At last, temperature distribution of a section of four peaks candle flame is reconstructed with this novel method.

关键词： Mathematical models Neural networks Spectrum analysis

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