Precise localization of eye centers with multiple cues

Automatic detection and precise localization of human eye centers are the essential processes in photo related multimedia applications. Since eye center points are used as reference base points for further intelligent processing, precise eye center localization is very important. In face recognition the accuracy of localization of eye centers directly influences the identification accuracy. A multiple stage approach with multiple cues for detection and precise localization of eye centers is presented in this paper. Multiple scopes searching strategy is used for correctly extracting eye patch images from the background. Dedicated gradient based features and curvelet based features are constructed and used for comprehensively revealing the intensity distribution characteristics and the edge based texture around eye centers. A rebuilt score calculation mechanism is proposed and the rebuilt scores are used as a specific measurement index reflecting the matching accuracy. The final localizations of eye centers are determined with integrating the gradient based scores and curvelet based scores. The experiment results testing on public face datasets show that the localization accuracy of proposed approach outperforms the accuracy with other state of the art methods.     

加成型硅橡胶灌封料流变性能的研究

研究了加成型硅橡胶灌胶封料的注性能。测定了硅橡胶灌封料的粘度，讨论了配制工艺条件及组份对硅橡胶灌封料流变性能的影响，分析了白炭黑在硅橡胶灌封料中的分散状态，实验结果表明，通过改进配制工艺条件，优化组分，可以制备出满足特定需要并具有高流动性的硅橡胶灌封料。     

关于图像反走样的理论及应用

图像反走样是用于提升图像质量的一个重要环节。导致图像失真的主要原因是由于采样频率过低及重建过滤器的质量低下。在实时渲染的应用中,随着硬件的发展及渲染架构的改变,主流反走样技术逐渐从硬件加速模式发展到后处理模式。纯后处理算法由于缺失子像素信息,无法生成高质量的反走样图像。针对这一问题,混合反走样在保留了后处理反走样效率的同时,通过结合多重采样能提供更精确的边缘处理,并保证图像在时序上的稳定性。     

A New Robust Adaptive Control of Uncertain Nonlinear Systems and Pendulum Application

A new robust adaptive control of uncertain nonlinear systems is proposed in this paper. The proposed method combines sliding mode control with the immersion and invariance (I&I) adaptive scheme, and it has more available degrees of freedom than using the backstepping scheme. Via the proposed method, a class of nonlinear systems with mismatched parametric perturbations can be rendered asymptotically stable and the performance of the system can also be improved. Finally, the proposed method is applied to a simple pendulum with motor dynamics, and simulation results show the effectiveness and performance of the proposed method.     

Stochastic reliable control of a class of networked control systems with actuator faults and input saturation

The stochastic reliable control problem for networked control systems (NCSs) subject to actuator failure and input saturation is investigated in this paper. In order to get the relationship between the maximum allowable consecutive packet dropouts, the packet dropout probability, the actuator failure matrix and the input saturation, a packet dropout probability dependent condition is given via linear matrix inequality (LMI) technology. Then, a suitable reliable controller is designed to ensure the closed-loop system to be exponentially mean square stable against actuator failures and input saturation. Finally, numerical examples are provided to show the effectiveness of the proposed method.     

智能手机点击劫持攻击检测方法研究

点击劫持通过欺骗用户点击经过伪装的界面元素达到攻击目的。移动互联网环境下,智能手机的屏幕特征、手势识别、HTML5支持度高等特性成为点击劫持新的利用点。深入分析并实验验证智能手机脆弱特性,在此基础上提出点击劫持在智能手机上的潜在攻击方案。进而设计并实现一套有针对性的检测方案。该方案从静态页面和动态行为两个角度提取攻击特征,并进行基于规则的量化评估与组合判定。实验结果表明该方案可以有效地降低传统页面特征检测方案的漏报和误报情况。     

PS／炭黑复合材料导电性能的研究

本文通过炭黑（简称ＣＢ）用量、加工工艺、温度对ＰＳ／ＣＢ复合材料导电性能影响的探讨、复合导电材料亚微观结构的观察，研究了ＰＳ／ＣＢ复合材料的导电性能。结果表明，随着ＣＢ含量的增加，材料的电阻率呈非线性下降，当ＣＢ的质量分数在１０％～４０％的范围内时，电阻率下降明显，在此含量范围以后，体积电阻率变化不大；材料的导电性能与加工工艺有关，溶剂法的导电性能比混炼法好；电阻率随温度的升高均有上升的趋势。由复合材料的亚微观结构表明，随着ＣＢ含量的增加，ＣＢ由分散的单个颗粒逐渐连结在一起，最后与ＰＳ形成了一种相互交错式的结构     

溶胶-凝胶和碳热还原法制备碳化钛的研究

以钛酸四丁酯和酚醛树脂为原料，乙二醇甲醚为溶剂，冰乙酸为稳定剂，在硝酸的催化下制备出凝胶前驱体，再将制得的前驱体于流通的氩气环境中经高温碳热还原得到碳化钛。讨论了各因素对凝胶时间的影响，用TG，XRD和SEM对制得的前驱体和产品进行了表征。结果表明，控制溶液的pH在2～3，水与钛酸四丁酯的物质的量比为6：1，溶剂与钛酸四丁酯的体积比为4：1时，得到的凝胶红棕色透明，所需时间最短；且由XRD和SEM分析可知，碳热还原反应是由TiO2经历一系列的低价态氧化物转变完成的；前驱体在氩气环境中经1400℃反应1h后生成的产物为TiC，其表面光洁，粒径分布均匀，大小为0．1～0．5μm。     

A study on the factors for improving the ethanol production from Jerusalem artichoke by Kluyveromyces fragilis

This study is to investigate the factors influencing the alcohol production byKluyveromyces fragilis using the juice of Jerusalem Artichoke tubers. The cell growth rate and ethanol production rate were stimulated by aeration and by the addition of unsaturated fatty acids and the cell mass production and the ethanol production were substantially improved. It was found that oxygen and unsaturated fatty acids added played a decisive role on the increase of alcohol tolerance of yeast.