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International Conference on Control and Automation (ICCA)

作者： Yuanming Ding Akira Sano Liaoning Key Laboratory of Intelligent Information Processing University Key Laboratory of Information Sciences and Engineering Dalian University of Technology Liaoning China Department of System Design Engineering Faculty of Science and Technology Keio University Yokohama Japan

A query-based local inverse modeling approach is proposed to compensate nonlinear power amplifiers (PAs) in orthogonal frequency division multiplexing (OFDM) systems. The PA is represented by the three-box model with a Wiener-Hammerstein structure. The inverse model of the PA is constructed based on the local modeling techniques, which can work as a predistorter (compensator) of nonlinear PA. Furthermore, a new look-up table (LUT) for constructing a predistorter of PA is also given to simplify the query-based nonlinearity compensation scheme (predistortion scheme). The effectiveness of the proposed scheme is validated by numerical simulation for a 64-ary quadrature amplitude modulation OFDM (64QAM-OFDM) transmission systems.

关键词： Power system modeling Power amplifiers OFDM Predistortion Inverse problems Table lookup Nonlinear distortion Nonlinear control systems High power amplifiers Computational complexity

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SPECTS O-CDMA field trials using subpicosecond pulses and integrated encoders/decoders across 80.8-km and 150-km links

SPECTS O-CDMA field trials using subpicosecond pulses and in...

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International Conference on Photonics in Switching (PS)

作者： N.K. Fontaine C. Yang R.P. Scott V.J. Hernandez F. Soares R. Broeke K. Perry G. Nowak W. Cong K. Okamoto B.H. Kolner Z. Ding J.P. Heritage S.J.B. Yoo Department of Electrical and Computer Engineering University of California Davis CA USA Department of Applied Science University of California Davis CA USA Key Laboratory for Micro/Nano Technology and System of Liao-ning ProvinceAerospace Systems Design Laboratory Massachusetts Institute of Technology Lexington MA USA

We compare two field demonstrations of SPECTS-OCDMA on an 80.8-km link and 150-km link using integrated, polarization independent arrayed-waveguide grating (AWG)-based encoders/decoders, an ultra-stable optical freque... 详细信息

关键词： Decoding Fiber nonlinear optics Nonlinear optics Optical receivers Frequency Optical pulses Optical pulse shaping Optical modulation Laboratories Polarization mode dispersion

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Development of core fuel management code system for WWER-type reactors

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Nuclear science and Techniques 2006年第5期17卷 308-313页

作者： XIA Bang-Yang WANG Tao XIE Zhong-Sheng National Key Laboratory for Reactor System Design Technology Chengdu 610041 China Shanghai Jiaotong University Shanghai 200030 China Xi＇an Jiaotong University Xi＇an 710049 China

In this article, a core fuel management program for hexagonal pressurized water type WWER reactors (CFMHEX) has been developed, which is based on advanced three-dimensional nodal method and integrated with thermal hydraulic code to realize the coupling of neutronics and thermal-hydraulics. In CFMHEX, all these feedback effects such as burnup, power distribution, moderator density, and control rod insertion are considered. The verifica- tion and validation of the code system have been examined through the IAEA WWER-1000-type Kalinin NPP benchmark problem. The numerical results are in good agreement with measurements and are close to those of other international institutes.

关键词：核反应堆压水堆燃料管理三维节点法

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Flux expansion nodal method for solving static and transient neutron diffusion equations, in hexagonal-z geometry

Flux expansion nodal method for solving static and transient...

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PHYSOR-2006 - American Nuclear Society's Topical Meeting on reactor Physics

作者： Bangyang, Xia Zhongsheng, Xie Chunyu, Xian Dong, Yao Department of Nuclear Engineering Xi'An Jiaotong University Xi'an Shaanxi 710049 China National Key Laboratory of Reactor System Design Technology Chengdu Sichuan 610041 China

ISBN: (纸本)0894486977

An intranodal flux expansion nodal method (FENM) for solving static and transient neutron diffusion equations in hexagonal-z geometry has been developed, in which the flux distributions are expanded into a set of analytic basis functions and orthogonal second-order polynomials. In order to improve the nodal coupling relations, a new type of nodal boundary conditions is proposed, which requires the continuity of both the zero- and first-order moments of partial currents across the nodal surfaces. The numerical results for a series of benchmark problems demonstrate that FENM exhibits good accuracy and convergence.

关键词： Neutron scattering

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Research and design of China Integral reactor Plant innovative containment

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Hedongli Gongcheng/Nuclear Power Engineering 2006年第6期27卷 91-93+98页

作者： Qin, Zhong National Key Laboratory of Reactor System Design Technology Nuclear Power Institute of China Chengdu 610041 China

China Integral reactor Plant (CIP) is a light water cooled, 300 MW power reactor under development by Chinese National Key laboratory of reactor system design technology. CIP features an integral reactor vessel that contains the CRDM and major reactor coolant system components including reactor core, coolant pumps, once-through steam generators and pressurizer. This integral design approach eliminates the large coolant piping and large loss of coolant accident (LOCA), and thus provides with higher level of securities. This paper introduces the selection of CIP containment system, the design of containment, the determination of design pressure for containment and the calculation analysis of containment structure.

关键词： Pressurized water reactors

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Uniform illumination system with desired emitting angle

Uniform illumination system with desired emitting angle

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SID 26th International Display Research Conference

作者： Whang, Jong-Woel Teng, Yuan-Ting Photoelectric System Simulation and Design Laboratory National Taiwan University of Science and Technology #43 Keelung Rd. Taipei 106 Taiwan

Backlight usually uses CCFL as light sources for the traditional LCD display. With the growing development of LED, it replaces CCFL gradually because of its advantage, such as durability, reliability, low-power and non-pollution. In addition, LED has developed towards the large size display such as LCD TV. Therefore, for backlight, it is quite important to achieve the uniform illumination distribution by arraying LEDs and increase brightness. The configurations of LED arrays and desired emitting angle of a lighting system can be design efficiently for a highly uniform illumination distribution by the method this paper presents, but not by trial and error processes. © 2006 SID.

关键词： Illuminating engineering

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On dynamic generation of business protocol in autonomous Web services

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systems and Computers in Japan 2006年第2期37卷 37-45页

作者： Oya, Makoto Kinoshita, Masahiro Kakazu, Yukinori Graduate School of Information Science and Technology Hokkaido University Sapporo 060-0814 Japan Department of Information Design Faculty of Engineering Hokkaido Institute of Technology Sapporo 006-8585 Japan Department of Information Science Shonan Institute of Technology Fujisawa 251-8511 Japan Open System Engineering Laboratory Division of Synergetic Information Science Graduate School of Information Science and Technology Information Processing Society of Japan IEICE Japan Society of Precision Engineering ACM Department of Information Design Hokkaido Institute of Technology Japan Society of Mechanical Engineers Complex System Engineering Laboratory Division of Synergetic Information Science Graduate School of Information Science and Technology Robotics Society of Japan

One of the issues of autonomous Web services is that precise business protocols across systems are not always predefined. A likely solution to this problem is to dynamically generate business protocols by matching external interface definitions and relating information exposed by each system. The current Web services have a feature called a portType that describes an external interface of a system. This paper proposes to add a new concept called "behavior pattern" to the portType, then provides an algorithm to dynamically generate business protocols. The algorithm compares the portTypes of the concerned system and the opposite system, verifies the possibility of their interaction, and automatically reduces the behavior patterns within executable range. The paper also evaluates this algorithm by applying it to some use cases and shows that the method provides useful early results for realization of autonomous Web services. © 2006 Wiley Periodicals, Inc.

关键词： World Wide Web

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Hybrid Learning Approach for the Collision Avoidance Behavior of a Mobile Robot

Hybrid Learning Approach for the Collision Avoidance Behavio...

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IEEE International Conference on Mechatronics and Automation

作者： Zhiqi Liu Naoyuki Kubota Quality Assessment Laboratory Parametric Technology Corporation Tokyo Japan SORST Japan Science and Technology Corporation Japan Department of System Design Tokyo Metropolitan University Hachioji Tokyo Japan

In the paper, a hybrid learning approach is proposed for a mobile robot to learn the collision avoidance behavior in a dynamic environment. In the proposed approach, a fuzzy controller based on the simplified fuzzy inference is used to control the robot's motion. Each fuzzy rule is expended to have multiple possible strategies. The selection probability of strategies is updated by the learning automaton, and output parameters of fuzzy rules are updated by the steady-state genetic algorithm. Simulation results show that after learning the robot can reach the goal while avoiding collision against moving obstacles. This proves the feasibility of the proposed learning approach

关键词： Collision avoidance Mobile robots Fuzzy control Automatic control Motion control Robot control Robot motion Learning automata Steady-state Genetic algorithms

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An Adaptive Nonlinearity Compensation Scheme for OFDM Communication systems

An Adaptive Nonlinearity Compensation Scheme for OFDM Commun...

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World Congress on Intelligent Control and Automation (WCICA)

作者： Yuanming Ding I. Nilkhamhang A. Sano Liaoning Key Laboratory of Intelligent Information Processing Dalian University Liaoning China Department of System Design Engineering Faculty of Science and Technology Keio University Yokohama Japan

An adaptive predistortion linearization is proposed to compensate for the nonlinear distortions induced by high power amplifiers (HPAs) in orthogonal frequency division multiplexing (OFDM) systems. By expressing the uncertain nonlinear input-output dynamics of HPA by a new simplified Volterra series model (VSM), a predistorter (i.e., compensator) is constructed based on identification of inverse system of the HPA. Once predistorter's parameters are obtained by RLS algorithm, when OFDM signals pass through the cascade system of the predistorter and the HPA, overall linearization from predistorter input to HPA output can be achieved even if HPA is uncertain. The effectiveness of the proposed predistortion method is validated by numerical simulation for 64-ary quadrature amplitude modulation OFDM (64QAM-OFDM) transmission systems

关键词： OFDM Predistortion Adaptive systems Nonlinear distortion High power amplifiers Nonlinear dynamical systems Power system modeling Resonance light scattering Numerical simulation Quadrature amplitude modulation

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Non-holonomy in im torque control

Non-holonomy in im torque control

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International Workshop on Advanced Motion Control (AMC)

作者： B. Crcar P. Cafuta G. Stumberger H.R. Cortes A.M. Stankovic Electrical Engineering Department Al-Azhar University Cairo Egypt School of Engineering Science and Design Glasgow Caledonian University Glasgow Scotland UK Valley Higher Institute for Engineering and Technology Science Valley Academy Cairo Egypt Tech. University of Delft THE NETHERLANDS State Key Laboratory of ASIC & System Fudan University Shanghai CHN

In the paper IM torque control is studied as an example of non-holonomic system with drift terms. Following the famous Brockett integrator problem several control propositions are introduced. The paper extends the control scheme from the state to the output control in several steps. By introducing adjusted amplitude, frequency and phase modulation of the IM stator current vector, the rotor flux linkage vector is implicitly forced to generate required periodic orbits that satisfy nonholonomic constraint. Improvements in the transient feedback performance, maximal steady-state efficiency, avoidance of singularities and sufficient robustness are actually achieved by making the current modulation dependent from the torque error signal. In the contrast with the original work instead of global only local stability could be assured. Simulation and experimental results illustrate main characteristics of the proposed control

关键词： Torque control Frequency Phase modulation Stators Rotors Couplings Orbits Feedback Steady-state Robustness

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