一种用来保护私有信息的K-匿名模型

针对信息推理性攻击，阐述了信息泄漏问题产生的原因，分析了现有的研究技术，在此基础上提出了一种用来保护私有信息的K-匿名模型，有效地防止了信息泄漏，同时也讨论了与K-匿名模型相关的问题，并通过实例加以验证。     

数字视频图像中运动估计的实现

要提高视频压缩编码的效率，必须选择一种实用的数字视频压缩技术。因MPEG-2，MPEG-4等压缩技术中的运动估计算法可以满足这种要求而具有良好的应用前景。     

基于网页探测技术的数据搜索系统的设计与实现

从网络搜索的原理入手,详细阐述了网络搜索的工作过程,包括对网络协议和搜索算法的研究和论证,对系统主要功能、构成和工作流程也进行了细致地划分、描述和解释.在整个设计过程中,首先制定了系统设计的理念原则,这是一个好的系统设计的基础,其次,给出了系统的程序设计,明确了系统的性能、功能要求、任务、结构和工作原理,最后给出了系统的程序实现.     

基于离散余弦变换的数字水印算法

在图像离散余弦变换重要系数的幅度成分中加入水印并利用相关监测器进行监测,以实现对多媒体数字产品的版权保护.实验证明,该算法对通常的图像处理,如剪切、噪声干扰、几何旋转等都具有一定的鲁棒性和不可见性.     

Effect of thrombin on the apoptosis of hippocampal neurons in vitro

Hippocampal neurons were treated by thrombin and thrombin receptor activating peptides (TRAP). Cell survival rate was decreased in a dose-dependent manner by MTT assay. The numbers of apoptotic cell and apoptotic rate of hippocampal neurons treated by different concentrations of thrombin were increased in a dose-dependent manner by terminal deoxynucleotidyl transferase (TdT) mediated dUTP-biotin nick end-labeling (TUNEL) method and Flow Cytometry. When the concentration of thrombin is 40 U/mL, TUNEL positive cells and apoptotic rate of hippocampal neurons reached peak value, were 27.3±4.0 and (29.333±4.633)%, respectively. Immunocytochemistry assay show that Bcl-2 protein expression was down-regulated and Bax protein expression was up-regulated with the concentration of thrombin increased. TRAP can mimic the effect of thrombin to induce apoptosis on hippocampal neurons. These data demonstrated that thrombin induced hippocampal neuron apoptosis in a dose-dependent manner through activating protease-activated protein-1 (PAR-1). The change in expression of Bcl-2 and Bax was related with the effect of high concentration thrombin induced apoptosis on hippocampal neurons. Foundation item: Supported by the Natural Science Foundation of Hainan Province (N30215) Biography: YANG Wen-qiong (1968-), female, Ph.D. candidate, research direction: cerebrovascular disease.     

以人为中心的机器人系统的人机交互技术

以人为中心的机器人系统(HCR)强调以人为本、人机合作的思想，主要用于动态、非结构化的环境和必需有人机共同完成的任务。笔者提出了基于穿戴计算的人机接口，使HCR的人机交互不受时间、空间的限制。通过增强现实，机器人的状态、报警等重要信息成为输出通道传输的重点，有效地减少了对信息传输带宽和再现信息的资源占用，减轻操作者的负担，进而提高HCR操作者对本地状态的意识和对远程环境的感知。通过并行、互补的多通道及整合、融合多个输入信息的方法，消除信息的多又性和噪声，从根本上克服当前人机交互的输入瓶颈，实现更加高效、人性化的HCR人机交互。     

Novel Hyper-Redundant Manipulator-. Design, Study and Experiment

A novel hyper-redundant manipulator named RT1 is designed and studied. The unique feature of RT1 is all degrees of freedom (DOF) are actuated with only one motor via special designed hinge bar universal joints. The mechanisms of RT1 are introduced in detail. Some experiments are carried out in order to test the movability and adaptability of the manipulator. RT1 is actuated by pulse string and acts discretely. The discrete working space of RT1 is described and the parameter optimization for kinematical redundancy resolution is studied also. The optimization criterion is altering the design parameter as little as possible during manipulator's motion from the initial position to the expected position. An optimization example is given that is realized with Matlab optimize tool-box.     

论高校科协在科技创新中的地位与作用

从高校科协在高校科技工作中的定位问题展开讨论,在分析高校科协的性质与特点的基础上,探讨高校科协的任务、地位及在促进科技创新过程中发挥的重要作用。     

胶体晶体及三维有序多孔材料的制备

以粒径为80～320nm的单分散苯乙烯／苯乙烯磺酸钠共聚微球为原料，采用一种全新而简单的制备高度有序胶体晶体模板的方法，利用静电相互作用、表面张力以及蒸发过程中的离子扩散等作用在液面形成了不合溶剂的高度有序的胶体晶体．将溶胶-凝胶前驱液在毛细效应作用下渗入胶体晶体间隙，待前驱液固化后，经煅烧去除苯乙烯微球，制备出了具有三维有序结构的多孔材料——倒置蛋白石．