基于混沌同步的混沌加密系统安全性

在Kerckhoff准则下，从选择密文攻击出发，探讨了基于混沌同步的混沌加密系统的安全性，并指出在选择密文攻击下可以获得加密系统的密钥．了基于超混沌的混沌加密系统和基于混沌的混合加密系统．结果表明，基于混沌同步的混沌加密系统不具有很高的安全性．     

电液伺服系统研究中的非线性分析方法

运用非线性性分析方法对一试验用电液伺服系统进行理论建模和仿真研究。引入了一 个非线性状态方程来描述电液伺服系统的动态特性。通过仿真结果与实际系统的响应相比较，验证了理论建模是准确的。在理论建模与仿真基础上，设计了一个自校正PID控制器，并且对其控制特性进行了仿真研究。     

Security analysis and modification of a chaotic encryption system

A type of digital chaotic encryption system was proposed in Ref. [1] which uses a class of 1-D piecewise linear (PWL) map to realize chaotic encryption and decryption system through the inverse system approach. In the general with the input terminal. In this paper we show that this cryptosystem can not frustrate chosen-cipher text attack. A type of chaotic encryption system based on self-synchronizing stream cipher is proposed. This system can avoid chosen-cipher text attack and has higher security.     

舰船润滑系统插装式减压阀设计中的非线性分析方法

介绍了一种新型的控制压力低、流通能力大和稳定性好的插装式减压阀,并运用非线性分析方法建立了插装式减压阀的数学模型和MATLAB仿真系统,分析了插装式减压阀的稳态特性和动态特性的影响因素．仿真与试验测试的比较结果表明,所设计的插装阀的性能可满足使用要求．     

Robust gray-image face detector based on local statistical features

An efficient training framework for gray-image face detection was presented. Our system includes two stages.In the first stage, the pattern rejection theory is used for features selection. The local Haar-like wavelet features used as rejection features to reject those patterns are not faces obviously. In the second stage, the Kullback-Leibler divergence in information theory is applied to choose more effective features further and to construct hierarchical classifier. The probability functions of two classes are estimated by joint-histograms. Final decisions are made according to the likelihood ratios between two classes. The experimental results show that our system is the same robust and efficient as the best reported methods, while the training efficiency is higher than others.     

基于参数跳动和扰动的混沌保密系统的理论设计

提出一种基于参数跳动和扰动的混沌保密方法．通过随机改变混沌映射的参数来提高混沌映射的复杂性；同时在有限精度实现时，通过引入随机扰动序列使得输出的混沌序列具有良好的自相关性、均匀分布特性和随机统计特性等．理论研究和模拟结果表明，该混沌序列加密方法具有较好的保密性并且便于软硬件实现．     

Nonlinear Modeling of a High Precision Servo Injection Molding Machine Including Novel Molding Approach

A nonlinear mathematical model of the injection molding process for electrohydraulic servo injection molding machine (IMM) is developed. It was found necessary to consider the characteristics of asymmetric cylinder for electrohydraulic servo IMM. The model is based on the dynamics of the machine including servo valve, asymmetric cylinder and screw, and the non-Newtonian flow behavior of polymer melt in injection molding is also considered. The performance of the model was evaluated based on novel approach of molding - injection and compress molding, and the results of simulation and experimental data demonstrate the effectiveness of the model.     

混沌加密系统的保密性能

从混沌同步对参数失配敏感性的特点出发,探讨了基于自然混沌系统同步分解的混沌保密通信系统的保密性能,指出基于低维混沌系统的通信系统不具有高保密性,容易受自适应同步控制的攻击,针对这一缺陷,对一类基于离散时间混沌噪声发生器的混沌加密方法进行了研究,其加密器与解密器之间对参数匹配误差敏感性的特点能防止自适应同步控制的攻击,且实现简单,加密性能易于控制,均优于基于低维混沌系统同步分解的加密方法。     

机器人yoyo轨迹规划与控制

以机器人yoyo运动控制为例,提出了一种针对周期性动态系统进行轨迹规划的通用方法.把yoyo达到底端时机器人机械臂的高度作为中间状态,通过逐个循环逐个阶段求解该最优问题,可得机器人的参考轨迹和名义控制,同时也可以得到被控对象相应的返回映射.该方法也可用于其他类似的周期性动态系统.