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RGB Color Image Encryption Method Based on Lorenz Chaotic System and DNA Computation

IETE technical review 2013年第5期30卷 404-409页

作者： Qiang Zhang Xiaopeng Wei Key Laboratory of Advanced Design and Intelligent Computing (Dalian University) Ministry of Education Dalian 116622 China

In this paper, an RGB color image encryption method based on the Lorenz chaotic system and DNA computation is presented. This method can not only change the location of the image pixel but also change the pixel values. Firstly, we split the RGB color image into R, G, B three components. Then, we use the 2D-hyperchaotic sequence to disorder the location of R, G, B three-component pixels. Secondly, three different chaotic sequences are generated by a one-dimensional logistic chaotic map, and the pixel values of the three components R, G, B can be scrambled through the three logistic chaotic sequences. Then the R, G, B digital images can be transformed into DNA coding matrices based on DNA coding rules. Thirdly, 3D chaotic sequences are generated by use of Lorenz chaotic system and are encoded based on DNA encoding rules in order to generate three DNA sequences. Finally, the encrypted image can be obtained by utilizing DNA operations on the DNA sequences of three components R, G, B and DNA sequences generated by the Lorenz chaotic system. The experiment results and encryption effect demonstrate that the proposed scheme is effective, and it has strong sensibility, high security, and good ability of resisting statistic attack.

关键词： 2D-hyperchaotic DNA computation Logistic chaotic map Security color image Security pixel DNA Computation cryptography Lorenz chaotic system DNA Sequence red-green-blue colour model

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A novel couple images encryption algorithm based on DNA subsequence operation and chaotic system

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Optik 2013年第23期124卷 6276-6281页

作者： Qiang Zhang Xiaopeng Wei Key Laboratory of Advanced Design and Intelligent Computing (Dalian University) Ministry of Education Dalian 116622 China

A novel couple images encryption algorithm based on DNA subsequence operation and chaotic system is presented. Different from the traditional DNA encryption methods, our algorithm is not use complex biological operation, but just uses the idea of DNA subsequence operation (such as elongation operation, truncation operation, and deletion operation). And then, do the DNA addition operation under the Chen's Hyper-chaotic map in this image cipher. The simulation experimental results and security analysis show that our algorithm not only has good encryption effect, but also has the ability of resisting exhaustive attack and statistical attack.

关键词： Image encryption DNA sequence Subsequence operation Addition operation Chen's hyper-chaotic Lorenz Security

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Speech emotion recognition using a novel feature set

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Journal of Computational Information Systems 2013年第15期9卷 6097-6104页

作者： Wang, Kunxia Li, Lian Yang, Jing Ren, Fuji Anhui Province Key Laboratory of Affective Computing and Advanced Intelligent Machine Hefei University of Technology Hefei 230000 China School of Electricity and Information Engineering Anhui University of Architecture Hefei 230000 China

Speech emotion recognition has attracted attentions from increased number of researchers in Psychology, Computer science, Phonetics and related disciplines. This paper discusses combining multiple features for speech emotion recognition to yield improved performance. It proposes using combination of multiple features to improve recognition performance. Using ChineseLDC emotional database, the experiment results show that a novel feature set of MFCC, fundamental frequency, Δ MFCC, Δ Δ MFCC, energy, zero-crossing ratio and amplitude can get the best performance as 95% and 84% for emotional speech recognition of four emotional state and six emotional state. © 2013 Binary Information Press.

关键词： Speech recognition

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Kinematics and Dynamics Analysis of a Quadruped Walking Robot with Parallel Leg Mechanism

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Chinese Journal of Mechanical Engineering 2013年第5期26卷 881-891页

作者： WANG Hongbo SANG Lingfeng HU Xing ZHANG Dianfan YU Hongnian Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University Xi’an University of Architecture and Technology Science and Technology Research Institute Yanshan University School of Design Engineering and ComputingBournemouth University

It is desired to require a walking robot for the elderly and the disabled to have large capacity,high stiffness,stability,***,the existing walking robots cannot achieve these requirements because of the weight-payload ratio and simple ***,Improvement of enhancing capacity and functions of the walking robot is an important research *** to walking requirements and combining modularization and reconfigurable ideas,a quadruped/biped reconfigurable walking robot with parallel leg mechanism is *** proposed robot can be used for both a biped and a quadruped walking *** kinematics and performance analysis of a 3-UPU parallel mechanism which is the basic leg mechanism of a quadruped walking robot are conducted and the structural parameters are *** results show that performance of the walking robot is optimal when the circumradius R,r of the upper and lower platform of leg mechanism are 161.7 mm,57.7 mm,*** on the optimal results,the kinematics and dynamics of the quadruped walking robot in the static walking mode are derived with the application of parallel mechanism and influence coefficient theory,and the optimal coordination distribution of the dynamic load for the quadruped walking robot with over-determinate inputs is analyzed,which solves dynamic load coupling caused by the branches’ constraint of the robot in the walk *** laying a theoretical foundation for development of the prototype,the kinematics and dynamics studies on the quadruped walking robot also boost the theoretical research of the quadruped walking and the practical applications of parallel mechanism.

关键词： walking robot parallel leg mechanism kinematics dynamics over-determinate inputs

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Face recognition based on PCA image reconstruction and LDA

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Optik 2013年第22期124卷 5599-5603页

作者： Changjun Zhou Lan Wang Qiang Zhang Xiaopeng Wei Key Laboratory of Advanced Design and Intelligent Computing Dalian University Ministry of Education Dalian 116622 China

Face recognition has become a research hotspot in the field of pattern recognition and artificial intelligence. Principal Component Analysis (PCA) and Linear Discriminant Analysis (LDA) are two traditional methods in pattern recognition. In this paper, we propose a novel method based on PCA image reconstruction and LDA for face recognition. First, the inner-classes covariance matrix for feature extraction is used as generating matrix and then eigenvectors from each person is obtained, then we obtain the reconstructed images. Moreover, the residual images are computed by subtracting reconstructed images from original face images. Furthermore, the residual images are applied by LDA to obtain the coefficient matrices. Finally, the features are utilized to train and test SVMs for face recognition. The simulation experiments illustrate the effectivity of this method on the ORL face database.

关键词： PCA Image reconstruction Residual images LDA Face recognition

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A novel image fusion encryption algorithm based on DNA sequence operation and hyper-chaotic system

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Optik 2013年第18期124卷 3596-3600页

作者： Qiang Zhang Ling Guo Xiaopeng Wei Key Laboratory of Advanced Design and Intelligent Computing (Dalian University) Ministry of Education Dalian 116622 China

A new image fusion encryption algorithm based on image fusion and DNA sequence operation and hyper-chaotic system is presented. Firstly, two DNA sequences matrices are obtained by encoding the original image and the key image. Secondly, using the chaotic sequences generated by Chen's hyper-chaotic maps to scramble the locations of elements from the DNA sequence matrix which generated form original image. Thirdly, XOR the scrambled DNA matrix and the random DNA matrix by using DNA sequence addition operation. At last, decoding the DNA sequence matrix, we will get the encrypted image. The simulation experimental results and security analysis show that our algorithm not only has good encryption effect, but also has the ability of resisting exhaustive attack and statistical attack.

关键词： Image encryption DNA sequence XOR operation Chen's hyper-chaotic Security

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design of a new solution for the wheeled hopping robot

Design of a new solution for the wheeled hopping robot

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UKACC International Conference on Control (CONTROL)

作者： Jingjing Liu Hongbo Wang Hongnian Yu Lili Zhang Luige Vladareanu Adrian Bruja Gal I. Alexandru Parallel Robot and Mechatronic System Laboratory of Hebei Province Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University Qinhuangdao China College of Electrical Engineering Yanshan University Qinhuangdao China School of Design Engineering and Computing Bournemouth University Poole UK Robotics and Mechatronic Department Institute of Solid Mechanics Bucharest Romania

In recent years many researchers are trying to combine wheeled movement with legged movement or hopping movement to strengthen the robots adaptability to environment. Hybrid robots are playing a more and more important role in our modern life. However, their controls are mostly complicated. So in this paper we present a new solution for the wheeled hopping robot. Based on the mechanical design, this robot has two movement modes: wheeled and hopping movement mode. While the center of gravity of the mechanism is under the wheels center, the wheeled hopping robot which is like a tumbler can keep its stability even when the wheels' velocity is zero. In this paper, we firstly introduce the description and design of the wheeled hopping robot. Then we explain how to choose the robot parameters and lastly we describe, how the robot through hopping, successfully traverses obstacles and ditches.

关键词： Mobile robots Shafts Wheels Springs Robot kinematics Force

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Research of unconventional emergency evolution state transfer rule

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ICIC Express Letters, Part B: Applications 2013年第4期4卷 1023-1030页

作者： Li, Tong Xia, Zhangli Zhou, Qing Yang, Wei Management College Hangzhou Dianzi University No. 1 2nd Ave Xiasha Higher Education Zone Hangzhou 310018 China Key Laboratory of Advanced Design and Intelligent Computing Ministry of Education Dalian University No. 10 Xuefu Ave Jinzhou Xinqu Dalian 116622 China

Unconventional emergency is essentially a developing process that event state variable changes from steady to transient, then to a new steady state. This paper uses plant growth dynamics theory to study microcosmic dynamical mechanism of unconventional emergency state space transformation. Under the effect of microcosmic dynamical mechanism, the state space transformation path may be countless. Herein we do not study each possible developing path of unconventional emergency individually, but focus on the analysis of the probability distribution of different paths, then determine the impact of controlling variable on probability distribution and confirm new steady points of unconventional emergency. This paper reveals the scenario elements and coping strategies that the unconventional emergency scenario evolution process faced, and finally provides scientific basis to cope with unconventional emergency. © 2013 ISSN 2185-2766.

关键词： Probability distributions

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Research of Acquisition Method for Pavement Surface Texture Based on Photometric Stereo Techniques

Research of Acquisition Method for Pavement Surface Texture ...

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17th International IEEE Conference on intelligent Transportation Systems & The Asia-Pacific Council on Systems Engineering Conference 2014

作者： Jinyu Lei Enjun Wang Juan Zeng Weifeng Wang Jianbo Wu Intelligent Transportation Systems Research Center Wuhan University of Technology Transportation Research Center Wuhan Institute of Technology Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology engineer at Jiangsu Province Communications Planning and Design Institute Company engineer at Jiangsu Power Transmission and Transformation Corporation

A 3D reconstruction technique was applied to acquire pavement surface texture since the traditional method can’t achieve the balance between accuracy and *** this study,a simple pavement texture detection platform consisting of a camera,lighted sources and tripod was developed basing on four sources photometric stereo *** the pictures captured by detection platform were analyzed by least square method to extract the normals of points in the pavement *** these normals were calculated,they were used to recover surface heights of pavements by tangent plane *** experimental result shows that the 3D model of asphalt pavement recovered by photometric stereo technique is efficiency to reveal the pavement surface topography both in macro-scale and micro-scale.

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AN IMPROVED MODAL ANALYSIS FOR THREE-DIMENSIONAL PROBLEMS USING FACE-BASED SMOOTHED FINITE ELEMENT METHOD

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Acta Mechanica Solida Sinica 2013年第2期26卷 140-150页

作者： Zhicheng He Guangyao Li Zhihua Zhong Aiguo Cheng Guiyong Zhang Eric Li State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Intelligent Systems for Medicine Laboratory School of Mechanical and Chemical EngineeringThe University of Western Australia35 Stirling HighwayCrawley WA 6009Australia Department of Mechanical Engineering National University of Singapore9 Engineering Drive 1117576Singapore

In this work, we further extended the face-based smoothed finite element method （FS-FEM） for modal analysis of three-dimensional solids using four-node tetrahedron elements. The FS-FEM is formulated based on the smoothed Calerkin weak form which employs smoothed strains obtained using the gradient smoothing operation on face-based smoothing domains. This strain smoothing operation can provide softening effect to the system stiffness and make the FSFEM provide more accurate eigenfrequency prediction than the FEM does. Numerical studies have verified this attractive property of FS-FEM as well as its ability and effectiveness on providing reliable eigenfrequency and eigenmode prediction in practical engineering application.

关键词： numerical method meshfree method modal analysis face-based smoothed finiteelement method （FS-FEM）

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