一种基于矩阵覆盖的密码体制

基于矩阵覆盖问题 (MC) ,设计一种新的 MC公钥密码体制 .这种新的公钥密码体制不含超递增序列 ,并且公钥量和密文更小 .     

波束域Root-MUSIC算法的进一步降阶处理

研究了波束域降阶Root-MUSIC算法，在子阵分解降阶的基础上，进一步将多项式的求根阶次降到与源数目相同，提出了求解降阶多项式的方法。该方法最大程度地减少了求根多项式的阶次和求解多项式的次数，并保持了Root—MUSIC算法的优良性能。显著降低运算量是其最大优点，仿真结果验证了降阶算法的有效性，并比较了不同阶次波束域Root—MUSIC算法的估计性能。     

基于公钥的虚拟光学信息安全系统

目前国际上关于光学加密的绝大多数研究都属于对称密钥系统,这种系统由于在网络环境下的密钥管理、分发、传输问题尚未得到解决,所以无法与信息安全领域的国际标准相结合,从而不能嵌入到公钥基础设施(PKI)中。基于密码学的公钥技术提出了一种混合密钥加密系统,并加入认证技术,从而构建了一个网络环境下的虚拟光学信息安全系统模型。将新发展的虚拟光学加密算法与公钥系统的概念以及网络安全技术结合,有效地解决上述问题,为虚拟光学加密方法在网络安全中的应用开辟一条途径。     

基于SVO逻辑的公钥协议进化生成

提出了一种公钥密码体制安全协议的生成方法,用进化策略来生成公钥协议,并采用SVO逻辑来描述和验证公钥协议。所提方法具有较高的扩展性,对于不同的需求,可以生成不同的安全协议。实验表明,所提出的方法能够高效地生成公钥协议,保证所生成公钥协议的安全性,并有效地提高协议效率和降低协议中消息的冗余度。     

NTRU公钥密码体制的遗传算法攻击

提出了一种应用遗传算法攻击NTRU公钥密码体制的方法。针对NTRU私钥的特点，该方法在编码时采取了顺序编码，交叉算子基于双亲的一组循环基因位实现，适应度定义为私钥在[-1，1]间系数个数与总系数个数之比。仿真结果表明，该攻击方法设计合理，将搜索空间缩小了2个数量级。     

契比雪夫多项式降阶方法及在数字滤波器设计中的应用

本文利用契比雪夫多项式的特性，提出了一种误差很小的降低几阶多项式阶数的一种可行方法。并给出了在数字滤波器的设计中用此技术获得的可靠结果。     

基于T-S模型的非线性系统的迭代学习控制

针对T-s模糊系统的轨迹跟踪控制问题,提出了基于正交多项式的迭代学习算法.该方法首先推导了T-S模糊全局系统的等价系统,然后利用正交多项式级数展开技术和其积分运算矩阵,将等价系统的微分方程转化为代数方程.在此基础上,用迭代学习的方式来修正输入量的正交多项式系数.所得算法对于具有任意相对阶的非线性系统,可用输出误差信号本身来构造学习律.仿真实例表明了新算法的有效性.     

基于DCT的线性定常系统高精度仿真算法

为了提高线性定常系统的仿真精度和速度，提出了基于快速DCT的线性定常系统高精度仿真算法。该算法与传统的仿真算法原理不同，它以数字信号处理方法和多项式多点快速求值算法为基础，采用了特殊的误差补偿算法。理论分析和上机仿真实践表明，该算法精度高，对于阶次高的系统计算量很小，尤其适于大规族并行计算。     

抗多普勒效应FRFT-PPM水声通信技术

针对现有水声通信系统抗干扰性能不佳和易受多普勒效应影响的问题,提出了基于分数阶Fourier变换的脉冲位置调制(fractional Fourier transform pulse position modulation, FRFT-PPM)的水声通信系统方案及分数阶域多普勒效应补偿方法。FRFT-PPM水声通信系统采用线性调频（linear frequency modulation, LFM）信号作为通信载波,借用PPM原理将信息调制到分数阶域脉冲位置中进行传输,具有通信速率可调,最高可达1.6kbit/s,抗噪声干扰能力强的优点。根据LFM信号较大多普勒容限和分数阶Fourier变换尺度变换特性,采用分数阶域分数阶域峰值位置补偿来抑制相对运动产生的多普勒效应。通过大量计算机仿真和湖试试验,验证了FRFT-PPM通信系统及分数阶域多普勒效应补偿算法的有效性与可行性。     

一种网上合同签署方案的PKI模型

随着公钥基础设施 (publickeyinfrastructure ,PKI)的出现 ,使得越来越多的电子商务方面的应用可以架构其上。提出一种适于网上电子合同签署的PKI模型。首先介绍了方案中用到的密码学相关知识 ;然后提出模型(包括单CA模型的扩展模型 )并对模型的正确性给出了相应的证明 ;最后 ,比较两个模型 ,对模型的特点作了进一步的说明。此外 ,为了清楚起见 ,还进一步给出了模型的实施方案简图。     

PKI中CRL撤消延迟的研究

首先建立了使用 CRL发布证书撤消信息的数学模型 .在对模型进行分析得基础上 ,对撤消延迟进行了分析 ,得到了撤消延迟的表达式并提出了发布 CRL的最佳方法 .最后给出了计算机仿真结果 ,对理论分析正确性进行了验证 .     

公共危机管理的系统突现分叉机理及其启示

运用系统科学的自组织涨落与分叉机制以及协同作用原理分析公共危机形成的机理。公共危机发生的实质可以看成是社会系统的各种突现分叉。作为系统的突现演化的自组织机制,不仅为公共危机管理的理论分析提供了一个新的视角,而且对公共危机管理的实践也具有重要启示。     

基于VR的塑料虚拟注射成型系统的研究与实现

虚拟现实，作为一门新型技术，已成功地应用于工程、设计和制造业领域。本文提出并实现一种基于虚拟现实技术（VR）的塑料注射成型的可视化交互式仿真系统。创新的采用Delaunay三角剖分技术进行成型设备的三维建模，同时提出了模拟注射成型过程运动仿真的方法，结合基于三维模型的注射成型FEA技术，创建注射成型仿真系统。整个系统可在塑料新产品设计的早期阶段及时的发现产品设计和工艺过程中可能出现的错误和缺陷，进行产品设计和生产工艺的优化，保证产品质量，节省开发新产品的时间和费用。     

户外增强现实系统关键技术及其应用的研究

增强现实技术是虚拟现实技术发展的一个重要分支，具有虚实结合、实时交互、三维注册的新特点，户外增强现实系统是近年来增强现实技术方面的一个新的研究方向，建立一个成功的户外增强现实系统的的最大障碍是缺少在户外条件下的准确跟踪技术。本文分析了实现户外增强现实系统的关键技术及其与室内增强现实系统的区别并讨论了户外增强现实系统的进展及应用。     

中国城镇企业职工基本养老保险基金的精算建模

基本养老保险制度是中国养老保险体系最重要的支柱。本文以城镇企业职工基本养老保险制度为例,建立基本养老保险基金收支的精算模型,与已有社会保障基金的测算模型相比,本文模型假设缴费状态和退休时间均为随机变量,根据基本精算原理刻画制度规定的所有现金流,以2005-2008年北京市城镇职工基本养老保险数据为例,测算结果表明,本文模型的预测结果与实际吻合.本文模型全面、客观地刻画了中国基本养老保险制度,可作为基本养老保险基金未来收支测算的规范精算模型.     

Methodologies for the Participant Construction of Knowledge

Over the last few decades there have been increasingly rapid changes in all fields (economic, political, etc. ...) leading to new forms of education and research. During the 1990s we have been working on innovative forms of education and participant research. In this context, this article includes some reflections on specific experiences of the construction of collective knowledge carried out in several cities, mainly in Spain and Latin America. It focuses on concrete postgraduate course experiences and it shows some innovative ways of collaborative relations between University, Public Administrations, and Social Organizations. The main theoretical and methodological principles of these experiences are also developed. On the other hand, we have been developing a network with some Latin partners on both sides of the ocean and we have recently made contacts with partners from English-speaking countries. We hope this article will contribute to building new bridges and communications on participant and instituent forms of knowledge construction.     

A multiyear lags input-holding-output model on education with excluding idle capital

This paper develops a multi-year lag Input-Holding-Output (I-H-O) Model on education with exclusion of the idle capital to address the reasonable education structure in support of a sustainable development strategy in China. First, the model considers the multiyear lag of human capital because the lag time of human capital is even longer and more important than that of fixed capital. Second, it considers the idle capital resulting from the output decline in education, for example, student decrease in primary school. The new generalized Leonitief dynamic inverse is deduced to obtain a positive solution on education when output declines as well as expands. After compiling the 2000 I-H-O table on education, the authors adopt modifications-by-step method to treat nonlinear coefficients, and calculate education scale, the requirement of human capital, and education expenditure from 2005 to 2020. It is found that structural imbalance of human capital is a serious problem for Chinese economic development. This research was supporting by the Key Project of National Natural Science Foundation of China under Grant No. 60874119, Innovation Funds of Chinese Academy of Sciences, Research Fund for Humanities and Social Sciences in colleges under Grant No. 06BJY102, Key project in Jiangxi Soft Science Project under Grant No. [2006]188, Jiangxi Research Fund for Humanities and Social Sciences in colleges under Grant No. 03JJ01, and Henan Research Fund for Humanities and Social Sciences in colleges under Grant No. 2008-ZD-002.     

Morality materialized: Notes on public prevention as a policy system

Public prevention is discussed as a policy system that owes its coherence to a number of “constitutive principles” rather than to an institutional fabric of its own. Notions from Luhmann's autopoietic social systems theory are combined with some recent developments in discourse analysis to outline this discussion theoretically. As to the constitutive principles, first, it is argued that public prevention is negatively constituted by its divorce from the regular healthcare system. Second, it is demonstrated that the constitutive principles of the public prevention system itself stem from the basic insecurities of this type of social policy. Public prevention strategies always have to impose themselves on existing (social) policy fields, and, more importantly, they often intrude upon people's private lives. That is why they tend to locate responsibility “outside,” moralizing the environment and moralizing things.     

A new neural network-based adaptive ILC for nonlinear discrete-time systems with dead zone scheme

By introducing a dead-zone scheme, a new neural network based adaptive iterative learning control (ILC) (NN-AILC) scheme is presented for nonlinear discrete-time systems, where the NN weights are time-varying. The most distinct contribution of the proposed NN-AILC is the relaxation of the identical conditions of initial state and reference trajectory, which are common requirements in traditional ILC problems. Convergence analysis indicates that the tracking error converges to a bounded ball, whose size is determined by the dead-zone nonlinearity. Computer simulations verify the theoretical results. This research is supported by General Program (60774022) and State Key Program (60834001) of National Natural Science Foundation of China, and Doctoral Foundation of Qingdao University of Science & Technology (0022324).     

基于IC卡数据的老年人公交出行行为

公交是城市老年人主要的出行方式。为研究老年人公交出行行为选择,引导老年人错峰和合理出行,提高公交运营效率,基于长沙市公交IC(Intergrated circuit)卡刷卡数据,分析了老年出行者高峰出行和无谓出行的状况。采用MNP(Multinominal Probit)模型和MNL(Multinominal Logit)模型,以一种新视角构建了老年人公交出发时间和出行次数选择模型,按照出行日期不同分别进行模型参数标定。结果表明:卡片类型、年龄、优惠程度、消费金额对出发时间和出行次数有显著影响,不同年龄段的高峰出行和无谓出行存在差异,且MNL模型的拟合精度度更高,能为解决老年人高峰出行和无谓出行提供指导。