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7th IFAC Symposium on Robust control Design, ROCOND'12

作者： Saat, Shakir Nguang, Sing Kiong Huang, Dan Swain, Akshya Department of Electrical and Computer Engineering University of Auckland 92019 Auckland New Zealand Key Laboratory of System Control and Information Processing Shanghai Jiao Tong University Ministry of Education Shanghai 200240 China

ISBN: (纸本)9783902823038

This paper investigates the problem of designing a nonlinear state feedback controller for a class of uncertain polynomial discrete-time systems using rational Lyapunov functions. The uncertainty that under consideration is modelled as a norm-bounded uncertainty. In general, the problem of designing a controller for polynomial discrete-time systems cannot be formulated as a convex problem. This is due to the fact that the Lyapunov function and the control input is not jointly convex, hence it cannot be solved by a semi definite programming (SDP). In this paper, we propose a novel approach where an integrator is introduced to convexify the nonconvex controller design problem, so that it can be solved easily by SDP. Furthermore, based on the sum of squares approach, sufficient conditions for the existence of a rational polynomial state feedback controller for a polynomial discrete-time systems are given in terms of solvability of polynomial matrix inequalities. These inequalities are then solved by the recently developed sum of squares (SOS) solvers. Finally, numerical example is provided to demonstrate the validity of this integrator approach. © 2012 IFAC.

关键词： Polynomials

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Linear cryptanalysis and security tradeoff of block ciphering systems with channel errors

Linear cryptanalysis and security tradeoff of block cipherin...

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6th International Conference on Network and system Security, NSS 2012

作者： Guo, Jing Wang, Zhuxiao Beijing 100029 China School of Control and Computer Engineering State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China

ISBN: (纸本)9783642346002

Channel errors are usually treated as an obstacle in designing an encrypted wireless system. So we are supposed to reduce them as much as possible due to the potential error bursts contributed by an avalanche effect of block ciphers. In this paper, we propose that channel errors are to be explored for the benefit of security enhancement as they could be translated to additional efforts in cryptanalysis for an adversary node. To achieve this, a system with an outer block channel coder and an inner block cipher is presented. A framework for linear cryptanalysis is established under which an eavesdropper takes advantage of linear relationship among coded symbols, as well as linear approximation of ciphers. Also presented is an analysis on the tradeoff between security enhancement and performance degradation in the presence of channel errors. © 2012 Springer-Verlag.

关键词： Cryptography

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Data mining development in “Actual Mobile guide for Tourist” application

Data mining development in “Actual Mobile guide for Tourist...

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IEEE control and system Graduate Research Colloquium (ICSGRC)

作者： Rifki Wijaya Ary Setijadi Prihatmanto Mochamad Vicky Ghani Aziz Control System and Computer Laboratory School of Electrical Engineering and Informatics Bandung Institute of Technology Bandung Indonesia

IT and tourism is a new innovative combination, the tourist can get the information of the object they want by only get the picture of the object by using their camera in mobile phone, and then the tourist will get th... 详细信息

关键词： Servers Mobile communication Data mining Databases Mobile handsets Business control systems

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Rayleigh particle filter for nonlinear tracking system

Rayleigh particle filter for nonlinear tracking system

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International Conference on Intelligent and Advanced systems, ICIAS

作者： Lenni Yulianti Bambang Riyanto Laboratory of Control and Computer System School of Electrical Engineering and Informatics Institut Teknologi Bandung Bandung Indonesia

Most papers on particle filtering are developed under the assumption that the distribution form of interfering noise is Gaussian, while the real physical systems would be more accurately modeled using non-Gaussian noises. This paper is examining the performance of particle filter for nonlinear tracking system with Rayleigh-distributed noises. We also investigate how Rayleigh particle filtering tends to give better RMSE than the Gaussian one, but needs longer execution time.

关键词： Particle filters Noise Atmospheric measurements Particle measurements Mathematical model Radar tracking

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Random Finite Sets (RFSs) approach in particle-based multi-target multisensor Bayesian filtering

Random Finite Sets (RFSs) approach in particle-based multi-t...

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International Conference on Telecommunication systems, Services, and Applications (TSSA)

作者： Lenni Yulianti Bambang Riyanto P. Ary Setijadi Laboratory of Control and Computer System Institut Teknologi Bandung Indonesia Institut Teknologi Bandung Bandung Jawa Barat ID

Various algorithms on multi-target multisensor tracking have been developed to provide reliable performance, in terms of tracking accuracy and computational efficiency. Propagating full multi-target posterior of the states at every time step of estimation process would certainly not be a suitable option due to its computational costs. To alleviate this problem, Random Finite Sets (RFSs) approach which leads to the implementation of Probability Hypothesis Density (PHD) filter offers more effective method. Based on the theory of Finite Set Statistics (FISST), RFSs represents the multi-target states and multisensor observations as a single meta-state and a single meta-observation, respectively. And the system propagates only the first moment, or PHD, associated with multi-target posterior in every recursion time step. This paper is evaluating the performance of this approach using simulation on a nonlinear range and bearing tracking problem, which is employed to track multi-target using several sensors to get the observations. Simulation results show that the algorithm successfully tracks the targets over the surveillance region, with slightly decreasing performance when the level of noise is higher and the clutter density is denser.

关键词： Target tracking Clutter Mathematical model Radar tracking Filtering Noise Equations

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Design of multiple anti-windup loops for multiple activations

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Science China(Information Sciences) 2012年第9期55卷 1925-1934页

作者： WU XiongJun 1,2 & LIN Zongli 3,1 1 Department of Automation,Shanghai Jiao Tong University,and Key laboratory of system control and Information Processing,Ministry of Education of China,Shanghai 200240,China 2 No.802 Institute of Shanghai Academy of Space Flight Technology,the Eighth Academy of China Aerospace Science and Technology Corporation,Shanghai 200090,China 3 Charles L.Brown Department of Electrical and computer Engineering,University of Virginia,P.O.Box 400743,Charlottesville,VA 22904-4743,USA Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai China No. 802 Institute of Shanghai Academy of Space Flight Technology the Eighth Academy of China Aerospace Science and Technology Corporation Shanghai China Charles L. Brown Department of Electrical and Computer Engineering University of Virginia Charlottesville USA

This paper considers anti-windup design for linear systems subject to actuator *** anti-windup gains are designed for activations immediately at the occurrence actuator saturation,after the saturation has reached a certain level and in anticipation of the occurrence of saturation,*** design is based on the minimization of L 2 gain from the disturbance to the controlled output of the resulting closed-loop *** anti-windup scheme involves a single anti-windup loop for immediate activation.A recent innovation is to design a single anti-windup loop for delayed or anticipatory activation,as well as to design two anti-windup gains,one for immediate activation and one for delayed *** design of three anti-windup gains for three different activations is shown through simulation to lead to significant further performance improvement over the previous activation schemes.

关键词： actuator saturation anti-windup anticipatory activation delayed activation L 2 gain nonlinear control

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Automatic segmentation of brain tumors in magnetic resonance images

Automatic segmentation of brain tumors in magnetic resonance...

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IEEE-EMBS International Conference on Biomedical and Health Informatics, BHI 2012. In Conj. with the 8th Int. Symp.on Medical Devices and Biosensors and the 7th Int. Symp. on Biomedical and Health Engineering

作者： Behzadfar, Neda Soltanian-Zadeh, Hamid Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering University of Tehran Tehran 14395-515 Iran Pooyandegan Rah Saadat Company Tehran 16756-965 Iran Image Analysis Laboratory Radiology Department HenryFord Healh System Detroit MI 48202 United States

ISBN: (纸本)9781457721779

Segmentation of tumors in magnetic resonance images (MRI) is an important task but is quite time consuming when performed manually by experts. Automating this process is challenging due to the high diversity in appearance of tumor tissue in different patients, and in many cases, similarity between tumor and normal tissues. This paper presents an automatic method for segmentation of brain tumors in MRI. We use images of patients with glioblastoma multiform tumors. After pre-processing and removal of the regions that do not have useful information (e.g., eyes and scalp), we create a projection image for determining the primary location of the tumor. This image provides an overall view of the tumor. Then, we grow the primary region to segment the entire tumor. This method is automatic and independent of the operator. It segments low contrast tumors without requiring their exacta tissue boundaries. The segmentation results obtained by the proposed approach are compared with those of an expert radiologist showing excellent correlations among them (R2=0.97). © 2012 IEEE.

关键词： Tumors

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Image mosaicing algorithm for dynamic scenes using multi-scaled PHOG feature and optimal seam

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Moshi Shibie yu Rengong Zhineng/Pattern Recognition and Artificial Intelligence 2012年第4期25卷 624-631页

作者： Zou, Li-Hui Chen, Jie Zhang, Juan Lu, Jing-Hua Key Laboratory of Complex System Intelligent Control and Decision of Ministry of Education School of Automation Beijing Institute of Technology Beijing 100081 China School of Computer and Communication Engineering University of Science and Technology Beijing Beijing 100083 China

Aiming at the problems of registration error and synthetic movement ghost which are caused by moving objects in image mosaicing, a mosaicing algorithm for dynamic scene using multi-scale pyramid histogram of oriented gradients (PHOG) and optimal seam is proposed. Firstly, a new feature, multi-scaled PHOG, is generated by introducing PHOG to multi-scale space corner detections. The feature is used to align images for avoiding the local impact caused by moving objects in image registration. Then, an optimal seam, guaranteeing the minimum difference in geometry and gray value, is searched by graph cut algorithm through constructing an energy function to remove the movement ghost. The experimental results show that the proposed algorithm is efficient in dealing with the problems of image mosaicing with moving objects, and the mosaicing results are satisfactory with high precision.

关键词： Graphic methods

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Performance optimization for cantilevered piezoelectric energy harvester with a resistive circuit

Performance optimization for cantilevered piezoelectric ener...

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2012 9th IEEE International Conference on Mechatronics and Automation, ICMA 2012

作者： Wang, Hongyan Shan, Xiaobiao Xie, Tao State Key Laboratory of Advanced Robot and System Harbin Institute of Technology Harbin China College of Computer and Control Engineering Qiqihar University Qiqihar China

ISBN: (纸本)9781467312776

The power optimality performance of a piezoelectric energy harvester connected to a resistive load is studied. An analytical solution for the unimorph piezoelectric energy harvester based on the piezoelectric constitutive equations and the fundamental mechanics of materials relations is adapted to estimate the optimal power and vibration amplitude. The accuracy of the output performance in the analytical solution is identified from a coupled piezoelectric-circuit finite element analysis (FEA). The results from FEA are in agreement with numerical calculation results. Furthermore, the impact of structural damping and the electromechanical coupling on the optimal energy harvesting performance is studied. The results indicate that the electricity power output has two maximum values at lower damping ratio, and the power output exhibits only one maximum value at higher damping ratio. It is also shown that the piezoelectric materials with higher effective electromechanical coupling coefficient (EMCC) don't necessarily yield more power output. © 2012 IEEE.

关键词： Energy harvesting

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Adaptive Fault–Tolerant control Design Approach for a Wind Turbine Benchmark

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IFAC Proceedings Volumes 2012年第20期45卷 319-324页

作者： Silvio Simani Paolo Castaldi The Department of Electrical and Computer Engineering The University of Auckland 92019 Auckland New Zealand School of Aeronautics and Astronautics Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education Shanghai 200240 China

This paper addresses the development of an active fault tolerant control scheme that is applied to a wind turbine simulated benchmark. The proposed methodology is based on a comprehensive scheme relying on adaptive controllers designed by means of the on–line identification of the system model under diagnosis. In this way, the controller reconfiguration mechanism exploits an adaptive regulator implementation, depending on the on–line estimate of system model. One of the advantages of this strategy is that, for example, the original structure of logic–based switching digital controller scheme already implemented for the wind turbine benchmark can be almost preserved. The active fault tolerant control scheme is therefore applied to a wind turbine simulated benchmark, in the presence of disturbance and measurement errors, along nominal operating conditions, including also different realistic fault situations. The achieved results in both fault–free and faulty conditions serve to show the enhancement of the control performances, and the fault accommodation features.

关键词： Fault tolerant systems adaptive control digital control system design nonlinear systems wind turbine benchmark

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