2009 International Workshop on Chaos-Fractals Theories and Applications最新文献_第2页

Image Compression Algorithm Based on Fractal-Wavelet 基于分形小波的图像压缩算法

2009 International Workshop on Chaos-Fractals Theories and Applications Pub Date : 2009-11-06 DOI: 10.1109/IWCFTA.2009.97

Wen-hui Guo

引用次数: 2

Enhancement of a Chaotic Carrier Bandwidth in a Multi-quantum-well Laser Transmitter Using Self-Phase Modulation in an Optical Fiber Feedback Path 利用光纤反馈路径中的自相位调制增强多量子阱激光发射机中的混沌载波带宽

2009 International Workshop on Chaos-Fractals Theories and Applications Pub Date : 2009-11-06 DOI: 10.1109/IWCFTA.2009.41

Yang Senlin

{"title":"Enhancement of a Chaotic Carrier Bandwidth in a Multi-quantum-well Laser Transmitter Using Self-Phase Modulation in an Optical Fiber Feedback Path","authors":"Yang Senlin","doi":"10.1109/IWCFTA.2009.41","DOIUrl":"https://doi.org/10.1109/IWCFTA.2009.41","url":null,"abstract":"We demonstrate theoretically and numerically a novel method of enhancing the bandwidth of a chaotic carrier from a multi-quantum-well laser transmitter using self-phase modulation (SPM) effect in an optical fiber round path. It is deduced theoretically that the nonlinear phase shift arisen from SPM effect has an impact on the gain and bandwidth enhancement factor of the laser. The second order nonlinear effect of the fiber enriches the varieties of the amplitude and the phase of the laser while the nonlinear phase shift produces a lot of new frequencies, which can spread the bandwidth. Numerical results reveal that, with SPM effect, the new bandwidth be can enhanced 4 times more than the bandwidth without the optical fiber path, and the relaxation oscillation frequency of the chaotic laser is increased to being 2 times more than that of the laser without the optical fiber path. It is found numerically that the enhancement of the chaotic bandwidth depends evidently on the optical fiber length, the power into the optical fiber, the coupling-feedback ratio and the second order nonlinear coefficient affect.","PeriodicalId":279256,"journal":{"name":"2009 International Workshop on Chaos-Fractals Theories and Applications","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122807875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application of Chaos Genetic Algorithm to Transformer Optimal Design 混沌遗传算法在变压器优化设计中的应用

2009 International Workshop on Chaos-Fractals Theories and Applications Pub Date : 2009-11-06 DOI: 10.1109/IWCFTA.2009.30

Shuang Zhang, Qinghe Hu, Xingwei Wang, Zhiliang Zhu

引用次数: 21

Robust Synchronization of Fractional Lorenz Systems Containing Nonlinear Inputs 包含非线性输入的分数阶Lorenz系统的鲁棒同步

2009 International Workshop on Chaos-Fractals Theories and Applications Pub Date : 2009-11-06 DOI: 10.1109/IWCFTA.2009.16

Yi-Sung Yang, Meei-Ling Hung, T. Liao, Jun‐Juh Yan

引用次数: 0

The Cipher Code Parameter Selection and Its Impact on Output Cycles 密码参数选择及其对输出周期的影响

2009 International Workshop on Chaos-Fractals Theories and Applications Pub Date : 2009-11-06 DOI: 10.1109/IWCFTA.2009.37

Q. Ding, Jing Pan, Lu Wang, Guanrong Chen

{"title":"The Cipher Code Parameter Selection and Its Impact on Output Cycles","authors":"Q. Ding, Jing Pan, Lu Wang, Guanrong Chen","doi":"10.1109/IWCFTA.2009.37","DOIUrl":"https://doi.org/10.1109/IWCFTA.2009.37","url":null,"abstract":"This paper gives the circuit design for logistic digital chaotic system, with the analysis of parameter selection for logistic cipher code, effecting factors and calculating method of sequence cycle. Through experiments it is shown that different calculating precisions and u value can be the factor that effects the cycle period most, changing u value can change the cycle and the larger precision can get the bigger cycle basically. For one thing, fixing u value and precision to test the effect of the initial value and find some good precisions; for another, further research shows there are some small cycles in good precisions. Therefore, it is unsafe to use initial value directly as the cipher code, for which the paper supposes an improvement program. This paper tests the cycle under certain conditions, and firstly deduces the cycle calculation formula, proposes the main conditions of cycles effected by the digital chaoic sequences and the cycle calculation method, then gives the scatter gram of precision-u-cycle. The methods given above have actual significances for estimating chaotic sequence cycle of finite precision in assured chaotic application field.","PeriodicalId":279256,"journal":{"name":"2009 International Workshop on Chaos-Fractals Theories and Applications","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131851201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 17

A Feasible Chaotic Encryption Scheme for Image 一种可行的图像混沌加密方案

2009 International Workshop on Chaos-Fractals Theories and Applications Pub Date : 2009-11-06 DOI: 10.1109/IWCFTA.2009.43

Dongming Chen

{"title":"A Feasible Chaotic Encryption Scheme for Image","authors":"Dongming Chen","doi":"10.1109/IWCFTA.2009.43","DOIUrl":"https://doi.org/10.1109/IWCFTA.2009.43","url":null,"abstract":"Cryptography is an important technique to keep private data secretly in order to avoid unauthorized access. Traditional encryption methods such as DES, RSA etc... are widely used today and it seems to be computationally secure. Chaotic encryption is the new direction of cryptography and only few papers discuss on it, and it makes use of chaotic system properties such as sensitive to initial condition and lost of information. An image encryption scheme is proposed, in which shifting the positions and changing the grey values of image pixels are combined simultaneously to ensure a high level of security. Arnold cat map is used to permute the positions of the image pixels in the spatial domain. Then another chaotic logistic map is used to substitute the relationship between the ciphered image and the original image. An external 128 bit secret key is employed and is further modified after encrypting each pixel of the original image to make the encryption more robust against attacks. Sensitivity analysis, key space analysis and statistical analysis of several experimental results indicate the presented scheme has high security and superior quality, and thereby it is feasible.","PeriodicalId":279256,"journal":{"name":"2009 International Workshop on Chaos-Fractals Theories and Applications","volume":"666 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132276552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

A Method to Determine the Parameters of Phase Space Reconstruction Based on the Neural Network 基于神经网络的相空间重构参数确定方法

2009 International Workshop on Chaos-Fractals Theories and Applications Pub Date : 2009-11-06 DOI: 10.1109/IWCFTA.2009.65

Runjie Liu, Z. Hou, Jinyuan Shen

引用次数: 2

Topological Conjugacy Classification of Cellular Automata 元胞自动机的拓扑共轭分类

2009 International Workshop on Chaos-Fractals Theories and Applications Pub Date : 2009-11-06 DOI: 10.1109/IWCFTA.2009.51

J. Guan, Shaowei Shen

引用次数: 0

Chaos-Genetic Algorithm Based on the Cat Map and Its Application on Seismic Wavelet Estimation 基于Cat图的混沌遗传算法及其在地震小波估计中的应用

2009 International Workshop on Chaos-Fractals Theories and Applications Pub Date : 2009-11-06 DOI: 10.1109/IWCFTA.2009.31

F. Wang, Yongshou Dai, Shaoshui Wang

引用次数: 6

Fractal Study on Plant Classification and Identification 植物分类鉴定的分形研究

2009 International Workshop on Chaos-Fractals Theories and Applications Pub Date : 2009-11-06 DOI: 10.1109/IWCFTA.2009.98

Wei Jiang, Cuicui Ji, Hua Zhu

引用次数: 13