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Journal of Systems engineering and Electronics 2010年第6期21卷 1054-1062页

作者： Lin Chai1, 2, Shumin Fei1, 2, Haiyan Jin1, 2, Ruimin Wang1, 2, and Yanhong Li1, 2 1. Key Laboratory of Measurement and Control of Complex Systems of engineering, southeast university, nanjing 210096, P. R. china 2. school of Automation, southeast university, nanjing 210096, P. R. china Key Laboratory of Measurement and Control of Complex Systems of engineering Southeast UniversityNanjing 210096P.R.China school of Automation Southeast UniversityNanjing 210096P.R.China

The problem on stabilization for the system with distributed delays is researched. The distributed time-delay under consideration is assumed to be a constant time-delay, but not known exactly. A design method is proposed for a memory proportional and integral （PI） feedback controller with adaptation to distributed time-delay. The feedback controller with memory simultaneously contains the current state and the past distributed information of the addressed systems. The design for adaptation law to distributed delay is very concise. The controller can be derived by solving a set of linear matrix inequalities （LMIs）. Two numerical examples are given to illustrate the effectiveness of the design method.

关键词： distributed delay linear matrix inequality (LMI) adaptive control time-delay systems memory PI feedback.

Resolution method for overlapping peaks based on the fractional-order differential

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science china Chemistry 2007年第6期50卷 797-805页

作者： LI YuanLu1, YU ShengLin2 & ZHENG Gang2 1 College of information & Control, nanjing university of information science & Technology, nanjing 210044, china 2 College of Automation engineering, nanjing university of Aeronautics and Astronautics, nanjing 210016, china 1. College of information & Control Nanjing University of Information Science & Technology Nanjing 210044 China 2. College of Automation engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

Equations between the differential order and the maximum of the fractional-order differential for the specified peak signals are developed based on the variation of the maximum of the specified peak signals at different orders. Also, equations between the differential order and the zero-crossing of the fractional-order differential of the specified peak signals are proposed according to the variation of the zero-crossing of the specified peak signals at different orders. Characteristic paramters of the Gaus- sian peak, Lorentzian peak, and Tsallis peak can be estimated using estimator I and estimator II which are obtained by the equations above. As a result, a new method is presented to resolve the overlapped peaks signal. Firstly, a fractional-order differential of the specified peak signals is obtained with the fractional-order differentiation filter. Then, characteristic paramters of the specified peak signals can be extracted using estimator I and estimator II. Finally, the Tsallis peak is used as a model to assign the overlapping peak signals correctly. Experimental results show that the proposed method is efficient and effective for the simulated overlapping peaks and detected overlapping voltammetric peak signals.

关键词： fractional-order differentiation filter, fractional-order differential, overlapping peaks, voltammetric peak

Thermal Insulation and Strength of Autoclaved Light Concrete

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Journal of Wuhan university of Technology(Materials science) 2011年第1期26卷 132-136页

作者：杨若冲吴智深 school of Transportation Southeast University Institute of Urban engineering science & Technology Southeast University

The primary objective of this study was to develop an autoclaved light concrete （ALC） material with ultra-thermal insulation property and to investigate the relationship between its physical characteristics and mechanical properties. Through tests of dry bulk density and compressive strength, relationship of physical characteristics and mechanical properties of samples were studied, resulting in a material with ultra-thermal insulation property. Scanning electron microscope （SEM） and energy-dispersive X-ray spectroscopy （EDX） were applied to analyze the micro-morphology and elemental composition of samples. To identify the product phases, X-ray diffraction （XRD） was engaged. The test results showed that compressive strength and thermal coefficient were reduced with the increasing of aluminum powder within the mixtures. As a result the optimal thermal coefficient and compressive strength of samples were improved to 0.061 W/（m·k） and 1.2 MPa, respectively. SEM, EDX and XRD analyses showed that calcium silicate hydrate and tobermorite crystal were main resultant phases.

关键词： autoclaved light concrete ultra-thermal insulation microscopic appearance and phase analysis tobermorite crystal

Basin filling algorithm for the circular packing problem with equilibrium behavioral constraints

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science china(information sciences) 2010年第5期53卷 885-895页

作者： LIU JingFa1& LI Gang2 1school of Computer and Software, nanjing university of information science & Technology, nanjing 210044, china 2school of Mathematics and Physics, nanjing university of information science & Technology, nanjing 210044, china 1. school of Computer and Software Nanjing University of Information Science & Technology Nanjing 210044 China2. School of Mathematics and Physics Nanjing University of Information Science & Technology Nanjing 210044 China

With the background of the satellite module layout design, the circular packing problem with equilibrium behavioral constraints is a layout optimization problem and NP-hard problem in math. For lack of a powerful optimization method, this problem is hard to solve. The energy landscape paving (ELP) method is a class of stochastic global optimization algorithms based on the Monte Carlo sampling. Based on the quasiphysical strategy and the penalty function method, the problem is converted into an unconstrained optimization problem. Here by combining the improved ELP method, the gradient method based on local search and the heuristic configuration update mechanism, a new global search algorithm, basin filling algorithm, is put forward. The numerical results show that the proposed algorithm is effective to solving the circular packing problem with equilibrium behavioral constraints, and is easy to be popularized to other layout optimization problems.

关键词： equilibrium behavioral constraints packing problem layout optimization

Asymptotic bound on binary self-orthogonal codes

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science china Mathematics 2009年第4期52卷 631-638页

作者： DING Yang Department of Mathematics, southeast university, nanjing 210096, china 1. Department of Mathematics Southeast University Nanjing 210096 China

We present two constructions for binary self-orthogonal codes. It turns out that our constructions yield a constructive bound on binary self-orthogonal codes. In particular, when the in-formation rate R = 1/2, by our constructive lower bound, the relative minimum distance δ≈ 0.0595 (for GV bound, δ≈ 0.110). Moreover, we have proved that the binary self-orthogonal codes asymptotically achieve the Gilbert-Varshamov bound.

关键词： algebraic geometry codes concatenated codes Gilbert-Varshamov bound Reed-Muller codes self-dual basis self-orthogonal codes 11T71

Characteristic analysis of unsteady viscous flow around a cavitating propeller

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science china(Technological sciences) 2010年第7期53卷 1983-1992页

作者： ZHU ZhiFeng1, 2, FANG ShiLang1 & WANG XiaoYan1 1 Key Laboratory of Underwater Acoustic Signal Processing of Ministry of Education, southeast university, nanjing 210096, china 2 school of Electrical engineering and information, Anhui university of Technology, Maanshan 243002, china 1. Key Laboratory of Underwater Acoustic Signal Processing of Ministry of Education Southeast University Nanjing 210096 China2. School of Electrical Engineering and Information Anhui University of Technology Maanshan 243002 China

Based on viscous multiphase flow theory, this paper presents some recent validation results with a hybrid grid and sliding mesh solving Unsteady Navier-Stokes (N-S) and Bubble Dynamics equations as applied to prediction of pressure, velocity and vapor volume fraction in the wake in an uniform inflow. Comparable to experimental results, numerical predictions of sheet cavitation, tip vortex cavitation and hub vortex cavitation are in agreement with the corresponding experimental data, the same as numerical predictions of pressure in wake. Tip vortex cavitation is the most important to generate the pressure fluctuation within the near wake. The characteristics such as blade and shaft rate frequency of propeller pressure in wake coincide with its geometric model and parameters. With increasing distance from propeller disk, the pressure signals at blade frequency de-crease. The process of attenuation becomes fast with the decreased advance coefficient and cavitation number.

关键词： cavitating flow RANS propeller sliding mesh multiphase flow

Measurement Study on Wind Characteristics of Typhoon Kalmaegi on the Sutong Bridge

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Wuhan university Journal of Natural sciences 2010年第2期15卷 153-159页

作者： HU Ruomei, WANG Hao, LI Aiqun school of Civil engineering, southeast university, nanjing 210096, Jiangsu, china school of Civil engineering Southeast University Nanjing China

The Sutong Bridge, a cable-stayed located in the southeast coastal area of china, is vulnerable to the Pacific typhoons. From the data measured by two 3D ultrasonic anemometers at the height of 76 m and 306 m, the wind characteristics （including 10-minute mean wind speed and direction, turbulence intensity and gust factor, power spectral density and integral scale of turbulence） of Typhoon Kalmaegi are analyzed The comparison of 10-minute mean wind velocity from the two anemometers vali- dates the reliability of wind data. The turbulence intensities （Iu, Iv, and Iw） show the decreasing trend as the mean wind speed increases. The mean value of Iv/Iu is 0.94, while that of Iw/Iu is 0.90. Discrepancy exists between field-measured power spectra and code-suggested spectra. Those results can enlarge the wind database of the southeast coastal area of china, and provide references for wind resistance evaluation of the bridge.

关键词： structural health monitoring system (SHMS) cable-stayed bridge Typhoon Kalmaegi wind characteristics

Joint subcarrier and power allocation in uplink OFDMA systems based on stochastic game

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science china(information sciences) 2010年第12期53卷 2557-2566页

作者： WU Dan 1,CAI YueMing 1,2 & SHENG YanMing 1 1 Institute of Communications engineering,PLA university of science and Technology,nanjing 210007,china 2 National Mobile Communications Research Laboratory,southeast university,nanjing 210096,china 1. Institute of Communications engineering PLA University of Science and Technology Nanjing 210007 China2. National Mobile Communications Research Laboratory Southeast University Nanjing 210096 China

In uplink orthogonal frequency division multiplexing access(OFDMA) systems,efficient resource allocation can greatly improve system ***,in this paper,we present a game-theoretical approach to achieve a joint subcarrier and power allocation in a distributed ***,the subcarrier allocation problem is modeled as a multi-player discrete,stochastic and finite strategy game,where each of the subcarriers is viewed as a player to choose the most satisfying *** subcarriers of each user are allocated with equal *** the proposed game model,on the one hand,we exploit the support and programming methods to obtain the Nash equilibriums,and analyze their theoretical *** the other hand,we propose a lowcomplexity algorithm based on the linear reward-inaction(L R-I) algorithm to search for the Nash *** the relationship between the convergence results of this algorithm and the Nash equilibriums is *** simulation results demonstrate the effectiveness of the resource allocation game model and algorithm.

关键词： stochastic game OFDMA subcarrier allocation power allocation learning automata linear reward-inaction

A research into the large-scaled spatial forms of cities based on urban design

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science china(Technological sciences) 2009年第9期52卷 2486-2496页

作者： WANG JianGuo school of Architecture, Key laboratory of Urban and Architectural Heritage Conservation of Ministry of Education, southeast university, nanjing 210096, china 1. school of Architecture Key laboratory of Urban and Architectural Heritage Conservation of Ministry of Education Southeast University Nanjing 210096 China

In the process of unprecedented urbanization in contemporary china, a great many of Chinese cities have witnessed a rapid expansion of urban scale to different degrees. With the continuous compilation, amendment and enforcement of urban planning, the functional structure, spatial environment, street patterns and textures and even the social aspect of cities have changed conspicuously, all of which have directly happened to the spatial forms of the dimension, or even the multi-dimension of a certain city. By describing and analyzing the structure, evolution and explicit tokens of the spatial forms of cities, this thesis attempts to set up a model of factors that affect urban forms, as well as discuss the attributes, protection, adjustment and development-potential of urban land closely associated with forms. In addition, on the basis of the professional features for urban design to participate in the modeling and construction-management of desirable spatial forms of cities, the author has put forward technical measures for quantitatively appraising and analyzing the large-scaled spatial forms of cities, thus offering technical support to municipal governments and management departments of planned construction.

关键词： large-scaled spatial forms of cities urban design digital technology

Consensus of multiagent systems based on disturbance observer

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控制理论与应用（英文版） 2010年第2期8卷 145-150页

作者： Hongyong YANG 1 , Fucai WANG 2 , Zhenxing ZHANG 3 , Guangdeng ZONG 4 (1.school of information science and engineering, Ludong university, Yantai Shandong 264025, china 2.school of Electronic and Electrical engineering, Ludong university, Yantai Shandong 264025, china 3.school of Automation, southeast university, nanjing Jiangsu 210096, china 4.Institute of Automation, Qufu Normal university, Qufu Shandong 273165, china) school of information science and engineering Ludong University Yantai Shandong China school of Electronic and Electrical engineering Ludong University Yantai Shandong China school of Automation Southeast University Nanjing Jiangsu China Institute of Automation Qufu Normal University Qufu Shandong China

The objectives of this work are the development and design of disturbance observers (DO’s) for a team of agents that accomplish consensus on agents’ states in the presence of exogenous disturbances. A pinning control strategy is designed for a part of agents of the multiagent systems without disturbances, and this pinning control can bring multiple agents’ states to reaching an expected consensus value. Under the effect of the disturbances, nonlinear disturbance observers are developed for disturbances generated by an exogenous system to estimate the disturbances. Asymptotical consensus of the multiagent systems with disturbances under the composite controller can be achieved. Finally, by applying an example of multiagent systems with switching topologies and exogenous disturbances, the design of the parameters of DO’s are illuminated.

关键词： Multiagent systems Disturbance observer Pinning control Consensus