A communication security protocol of mobile agent system

The security issues of mobile agent system have embarrassed its widespread implementation. The paper analyses communication security threats and countermeasures of mobile agent system and proposes a communication security protocol of mobile agent system. It provides multifactor authentication, encryption transmission, and integrity protection of mobile agent.     

An equivalency condition of nonsingularity in nonlinear semidefinite programming

<正> In this paper,an equivalency condition of nonsingularity in nonlinear semidefinite programming,which can be viewed as a generalization of the equivalency condition of nonsingularity for linearsemidefinite programming,is established under certain conditions of convexity.     

基于高斯模型拟合的图像分割算法的实现

图像分割算法是计算机图像检测和视频监控的重要组成部分，其目的是为了最大限度的让检测目标与背景分离，以便于系统可以准确的提取目标并做进一步处理。基于高斯模型拟合的自适应阈值算法可以将数据间的干扰降到最低，提高Gauss拟合模型的精度，适用于各种复杂背景环境下的图像分割。     

Integral-type tests for goodness-of-fit

<正> A family of integral-type goodness-of-fit tests is investigated.This family includes someexisting tests,such as the Cramér-von Mises test and Anderson-Darling test,etc.The asymptoticdistributions of the tests in the family under the null and local alternative hypotheses are established.The almost sure convergence under a fixed underlying distribution is obtained.Furthermore,simulationsare conducted to compare the powers of the tests in the family.Simulation results show that fordifferent alternatives,the more powerful tests are different,and the parameter λ has great influence onthe tests in small sample cases.     

An atomistic simulation of site preference and vibrational properties of UMxAl12-x （M = Fe, Co, Ni, Cr and Mn） and UMxAl1z-xHx

A series of lattice inversion pair potentials are used to evaluate the phase stability and site preference for uranium intermetallics UMxAl12-x (M = Fe, Co, Ni, Cr and Mn) and their related hydrides. Calculated results show that Fe, Co, Ni, Cr or Mn atoms preferentially substitute Al at the 8f site. Interstitial H atoms only occupy 2b interstitial sites in UMxAl12-x. Calculated lattice constants are found to agree with a report in the literature. Elastic constants and bulk modulus of UMxAl12-x and UMxAl12-xH were also investigated. In particular, the phonon densities of states (DOS) of these actinide compounds were evaluated for the first time.     

浅谈工程档案资料管理

文章阐述了工程建设过程中工程资料整理的重要性、必要性和做好工程资料整理的意义,介绍了完善资料整理过程中经常遇到的几点问题,在此基础上总结出改进资料整理工作的措施,以此来促进资料质量的进一步提高,为竣工资料归档工作奠定扎实的基础.     

日本农业机械发展状况的统计分析

根据日本农业机械学会的农机统计报告提供的大量数据，分析了目前日本的农业状况以及８０年代以来日本农业机械总的发展状况，同时对主要的农机产品即拖拉机、插秧机和联合收割机进行了具体的分析．还根据这些统计数据对未来日本农业机械的生产情况作了预测．     

跨栏步两腿用力时空规格之教法研究

在高师体育系田径普修课直道跨栏跑的技术教学中，以跨栏步两腿用力的时空规格为教学重点来带动其他技术的学习，教学实验体现出这一教学方法的优越性．     

自制和进口试剂盒在犬细小病毒检测中的应用

用本研究室研制的犬细小病毒单克隆抗体和多克隆抗体，采用夹心ＥＬＩＳＡ原理，研制成功犬细小病毒快速诊断试剂盒。对８７份犬粪便样品进行检测，并与ＨＡ法和美国ＩＤＥＸＸ公司研制的ＥＬＩＳＡ试剂盒进行比较。结果表明，与ＨＡ法相比，自制试剂盒的敏感性为９３．３％，特异性为１００％，总符合率为９５．４％；与美国试剂盒相比，自制试剂盒的敏感性为１００％，特异性为８４．６％，总符合率为９５．０％，达到国外同类产品     

一种利用图进行图像分割的高效方法

利用图像的图表示定义了一个衡量区域间边界存在性的谓词函数,在此基础上给出了一种运行时间与图中边的数目成近似线性,实际效果良好的有效图像分割方法.方法具有在高可变性区域时忽略细节,在低可变性图像区域时保存细节的能力.