Invasiveness of LiTaO/sub 3/ and GaAs probes in external E-O sampling

Disturbances of signals on a coplanar waveguide (CPW) induced by the presence of LiTaO/sub 3/ and GaAs electrooptic probes in external electrooptic (EO) sampling have been simulated and compared quantitatively. The finite-difference-time-domain method is used to simulate the full wave field around a coplanar waveguide on a GaAs substrate in an external EO sampling configuration. The results indicate that the induced signal disturbance, or invasiveness, of a LiTaO/sub 3/ probe is almost ten times that of a GaAs probe in terms of the magnitude of S/sub 11/, but that LiTaO/sub 3/ yields about two times the EO response for a given S/sub 11/ and optical probing wavelength. The transparency of LiTaO/sub 3/ to shorter wavelengths, however, allows an even higher sensitivity for this material relative to GaAs. The results suggest that these probes do not exhibit significant invasiveness (magnitude of S/sub 11/ smaller than -40 dB), if they are removed from contact by the distance of CPWs center conductor width.<>     

地方时与区时在电离层研究中的差异

本文指出混淆地时与区时两个时间概念在电离层研究中带来的差异的严重性，建议使用地方与区时这两个名词，而抛弃“本地时”和“当地时”等容易引起混淆的名词。     

宽温环境下磁光盘写入光功率的优化

利用有限单元法研究了环境温度、写入光功率、磁光盘膜面温度分布三者间的关系，在此基础上导出了宽温环境下的最优写入条件，该条件为优化宽温磁光盘读出性能提供了依据。     

基于MVC架构文档报表管理系统的设计与实现

根据公司对文档报表管理的实际需求,通过对某房地产评估公司的日常报告文档管理的各方面的需求分析,将系统的需求抽象化、模块化、系统化,利用.NET开发平台MVC架构实现了报告信息管理、数据维护管理、公司收据和报告文档管理等功能,实现了管理文档的规范化和信息化,提高公司管理文档信息的工作质量、管理水平,为用户提供更为方便快捷的服务。     

RSA公钥算法的新探讨及改进

众所周知,RSA是唯一一个能够同时实现数据加密、数字签名、秘钥交换的算法。其过程可简述为选取两个大的质数乘积n=p’q（非公开）,然后选择一个和牵（n）互质的整数e（其中1〈e〈（b（n））,求其关于欧拉函数巾（n）=（p-1）（q-1）=φ（P）＊φ（q）的逆元d,进而得到公钥对与私钥对（e,n）和（d,n）。假如n是三个或更多素数的乘积会怎样？该算法是否依然成立？本文旨在探讨n取更多素数乘积时所得到的结论以及根据这些结论所能对RSA作出的改进。     

A new intelligent prediction system model-the compound pyramid model

A current development trend in research on intelligent systems is to optimize a general intelligent prediction system into an individuation intelligent prediction system that is applied in specialized fields. Protein structure prediction is a challenging international issue. In this paper, we propose a new intelligent prediction system model, designed as a multi-layer compound pyramid model, for predicting secondary protein structure. The model comprises four independent intelligent interfaces and several knowledge discovery methods. The model penetrates throughout the domain knowledge, with the effective attributes chosen by Causal Cellular Automata. Furthermore, a high pure structure database is constructed for training. On the RS126 dataset, the overall state per-residue accuracy, Q3, reached 83.99%, while on the CB513 dataset, Q3 reached 85.58%. Meanwhile, on the CASP8 sequences, the results are superior to those produced by other methods, such as Psipred, Jpred, APSSP2 and BehairPred. These results confirm that our method has a strong generalization ability, and that it provides a model for the construction of other intelligent systems.     

基于AP2DR2指挥信息系统的安全防护体系研究

本文首先介绍了指挥信息系统安全防护的基本概念和特点,然后从网络安全技术和网络安全管理等方面分析了如何实现指挥信息系统完全,提出了一种基于AP2DR2模型的指挥信息系统安全防护体系,论述了AP2DR2安全模型是一个多层次、全方位的动态防御体系,指挥信息系统安全防护体系从静态、被动向动态、主动转变,有效地保障了指挥信息系统信息的安全。     

Service-oriented smart home applications: composition, code generation, deployment, and execution

A smart home usually has a variety of devices or home appliance, instead of designing software for a specific home, this paper proposes a service-oriented framework with a set of ontology systems to support service and device publishing, discovery of devices and their services, composition of control software using existing control services that wrap devices, deployment, and execution of the composed service in an computing environment, monitoring the execution, and recovery from device failure. The ontology systems specify semantic information about devices, services, and workflows used in various smart home, and users can compose and recompose services for their specific needs. New devices, workflows, and services can be added into ontology. Most of the steps in this process can be automated including code generation. For example, service composition will be carried out in three steps: abstract workflow design, function construction, and device discovery, and different codes can be generated for different computing platforms such as Java and Open Services Gateway initiative environments. In this way, a variety of smart home can be constructed rapidly using the framework by discovery and composition using existing services and workflows. This paper illustrates this framework using a media control example to illustrate the ontology, discovery, composition, deployment, execution, monitoring, and recovery.     

点云模型的谱聚类分割

为了实现点云模型的有意义分割,提出一种基于谱聚类的分割算法.首先用图G表示点云模型,将分割问题转化为图切割问题;然后根据归一化的非对称Laplacian矩阵构造谱聚类空间;最后通过移除掉多余的特征向量,在一个更低维的空间中找到了分割问题的松弛解.文中还给出了该算法相关定理的证明,并通过实验验证了算法的正确性和有效性.     

基于感知的体可视化综述

体可视化是一门交互地视觉呈现三维数据场的技术,允许用户直观方便地理解数据中所包含的几何结构和特征信息,在医学影像、石油勘探、大气气象和科学计算模拟等领域得到广泛应用.由于三维数据场内部特征的复杂性,实现高表达力的体可视化需要同时考虑数据的特性和用户的因素.基于感知的体可视化技术在可视化流程中考虑人类感知过程和认知过程的特点,使得可视化的结果符合人类感知特性和习惯,达到有效地揭示数据特征的目的.文中从用户驱动的体数据分析、符合感知的可视化设计和表意性体可视化3个方面对基于感知的体可视化的相关技术进行梳理总结,并指出该领域需要进一步探索的研究方向.