基于Turbo编码的支付安全密钥敏感性表征

在使用电子银行支付和交易中,密钥的敏感性和随机性决定了交易安全。传统方法采用算术编码方法进行电子银行密钥设计,敏感性表征效果不好,安全性不佳,提出一种基于Turbo编码的电子银行支付安全密钥敏感性表征方法,进行电子银行支付Turbo编码设计,设计电子银行支付安全密钥总体系统,基于Turbo编码的电子银行支付密钥重传协议得到改进的电子银行支付安全密钥敏感性表征算法。实验结果证明,该算法电子银行支付安全密钥的敏感性特征和加密性能接近理论最优,实现优化加密,能有效滤除干扰因素影响,对异常操作具有较好的敏感性表征,电子银行支付安全性得到改善。     

基于Turbo码的比特级联合信道安全编译码

联合信道安全编码将信道编码作为加密系统实现了纠错与加密的合二为一.本文采用基于密钥控制随机删余的Turbo码来实现联合信道安全编码.针对目前普遍采用的Turbo码迭代译码方案计算量大、译码延时长和功耗大的问题,采用一种新的比特级迭代译码算法,结合编码时的加密删余信息,对未收敛比特在一个小窗口内进行部分迭代以减少已收敛比特的不必要迭代,从而减少总体迭代次数和计算量.实验表明本方案可在保障通信可靠性和安全性的基础上进一步降低译码开销,提高译码效率.     

Context 模型奇异测度及其在量化中的应用

使用聚类算法实现 Context 量化不仅可以推广量化器的应用范围,而且可以获得编码性能较理想的优化量化器。然而,聚类算法依赖于相似测度。前期研究中采用的描述长度增量不能完全满足相似测度的各项属性,从而导致聚类结果的性能偏差。因此,提出数学描述特性更好的奇异测度增量作为两个计数向量的相似测度,并说明其相应性质。实验结果证明,使用奇异测度增量作为相似测度,不仅能够保证 Context 量化器的稳定性,而且还获得更佳的编码结果。     

What boxing-related stimuli reveal about response behaviour

When two athletes meet inside the ropes of the boxing ring to fight, their cognitive systems have to respond as quickly as possible to a manifold of stimuli to assure victory. In the present work, we studied the pre-attentive mechanisms, which form the basis of an athlete’s ability in reacting to an opponent’s punches. Expert boxers, beginner boxers and people with no experience of boxing performed a Simon-like task where they judged the colour of the boxing gloves worn by athletes in attack postures by pressing two lateralised keys. Although participants were not instructed to pay attention to the direction of the punches, beginner boxers’ responses resembled a defence-related pattern, expert boxers’ resembled counterattacks, whereas non-athletes’ responses were not influenced by the unrelated task information. Results are discussed in the light of an expertise-related action simulation account.     

量子高密度编码原理及其MATLAB仿真

由于没有实际操纵量子比特的条件,MATLAB以其简便的矩阵操纵手段和强大的科学计算功能,成为通信工程人员和在校学生学习量子通信基本原理的良好工具。给出了量子比特及其测定、量子序列、贝尔态基和常用量子逻辑门的MATLAB语言描述。分析了量子高密度编码原理,给出了MATLAB仿真程序。     

基于改进哈夫曼编码的数据压缩方法研究

作为一种无损压缩编码方法,哈夫曼编码在数据压缩中具有重要的应用。经典的哈夫曼编码是在构造哈夫曼的基础上自下而上进行的,通过分析哈夫曼算法的思想,给出了一种改进的哈夫曼数据压缩算法。该算法利用队列结构,从哈夫曼的根节点出发,向叶子节点进行编码,在编码过程中仅将哈夫曼树的每个叶子节点进行一次扫描便可以得到各个叶子节点的哈夫曼编码。实验表明,改进算法不仅压缩率高于以往算法,而且保证了最终生成的压缩文件的安全性。     

可伸缩编码中的RTP封装及其应用

可伸缩视频编码（Scalable Video Coding,SVC）一般采用实时传输协议（Real-time TransportProtocol,RTP）保证视频数据流的实时传输和质量监测。本文在分析SVC码流结构和RTP协议的基础上实现了H.264/SVC视频数据的RTP封装算法,提出了一种基本层与增强层分离的灵活封装机制模拟SVC在不同差错信道中的传输,通过在H.264/SVC模拟测试环境中的实验证明RTP封装机制的有效性,标准兼容性和可扩展性。     

Assessing the concordance between child reports and adult observations of single and mixed emotion in children’s drawings of themselves or another child

The present study assessed concordance between child reported and adult observed strategies to depict single and mixed emotion in the same human figure drawings. 205 children (104 boys, 101 girls) aged 6 years 2 months to 8 years 3 months formed two age groups (6 years 2 months–7 years 2 months and 7 years 3 months–8 years 3 months) across two conditions drawing either themselves or another child. They heard vignettes designed to elicit single and mixed emotion and drew a baseline drawing, counterbalanced happy and sad, and a mixed emotion drawing. Categories of children’s verbal reports and adults’ observations were similar with some variation of use by condition, age group and emotion type. Mixed emotion strategies were more similar to those observed and reported in happy drawings. Findings are discussed in relation to a framework theory of art and social display rules.