3GPP系统全系列信息安全及其算法设计与应用

介绍了GSM／GPRS与3GPP系统安全体制的安全功能及其算法；研究了GSM／GPRS中A3／A8、AS／GEA算法的实现技术；给出了3GPP中AKA协议和空中接口安全算法的设计要求及其多种设计方案；并结合我国《商用密码管理条例》的要求，探讨了3GPP中保密性与完整性算法的国内应用的特殊化和国际标准化的问题。     

入世对我国行政职能运行的影响

行政权力的运行必须适应社会的转型要求,随着社会的发展及加入 WTO,行政权力的运行方式必然要发生深刻的变革,从行政权力主导型转交为社会(市场)主导型。行政职能法律化是一个历史规律。     

基于PHP的校园公文发布系统的设计与实现

分析了校园公文发布系统的基本结构 ,给出该系统的设计思路 .在分析B/S结构和PHP技术特点的基础上 ,提出了校园公文发布系统的一种结构形式 ,并使用PHP MySQL技术实现了该系统的主要功能     

Implementation of the finite deformation plastic theory-Tensor derivative and metal forging simulation

It has been shown that the traditional small deformation plasticity can be transplanted to the finite deformation plasticity by using the logarithmic strain measure only. In this way, the mathematical problem of how to find the derivative of a tensor function arises. In this paper, a general method for finding the derivative of a tensor function is proposed. Several metal forging examples are given.During the calculation, the mesh regeneration is not even invoked.     

Relations among gauge functions, metrics and Hausdorff measures

In this paper we discuss the relations among the doubling condition, equivalence of the Hausdorff measures and equivalence of metrics. We will show that H ρ,g1 and H ρ,g2 are equivalent for any compact metric space (X,ρ) if and only if g1 and g2 are equivalent gauge functions. Then, we prove that for given c∈(0,∞)＼{1}, H ρ,g and H cρ,g are equivalent for any compact metric space (X,ρ) if and only if the gauge function g satisfies the doubling condition, where H ρ,g is the Hausdorff measure with respect to the metric ρ and gauge function g.     

Shift visual cryptography scheme of two secret images

A new visual cryptography scheme of two secret images, which is named the shift visual cryptography of two secret images, is given. The compound function family of a general construction model is also introduced. The uniqueness and validity of this model are proved, and the minimum rows and columns for realizing the scheme are obtained. Compared with visual cryptography of one secret image, the shift visual cryptography scheme can share two secret images with the same size of pixels expansion without losing the contrast. It has randomness and various forms, and furthermore, we can also visually recover two secret images even if the two shares are different in form and color.     

江南丘陵区土地利用/覆被分类

江南丘陵区土地利用/履被类型相对比较复杂，传统的基于光谱特征的计算机自动分类的精度难以达到实际应用的需求．为了提高分类精度，需要模仿目视解译过程，从遥感信息机理与地学规律的综合分析人手，综合其它辅助信息进行分类．在对绍兴试验区地学背景知识和遥感数据光谱特性充分分析的基础上，获取了试验区各类典型地物分类的知识，并以规则的形式表示这些知识，集成TM影像亮度值、亮度值关系和DEM、坡度和坡向地理辅助数据对试验区土地利用/履被进行分类．结果表明，该方法可以方便有效地综合多种辅助数据进行分类，得到令人满意的分类结果，本次试验的分类精度为86．66％。     

方程(t)=ax(t)+bx(t-τ)+cx(t+τ)关于[-τ,0]上的初始函数解的存在性

讨论了混合型方程x·(t)=ax(t)+bx(t-τ)+cx(t+τ)x(t)=φ(t)　　t≥0,t∈[-τ,0].其中φ(t)是任意给定的[-τ,0]上的连续函数,a、b、c∈R,当bc≠0时,对该混合型方程的所有解的基本形式做了详细讨论.     

玉米淀粉与丙烯酸胺接枝共聚物的制备

本文研究玉米淀粉与丙烯酰胺接枝共聚物的合成工艺及其在造纸工艺中用作干强剂、助留/助滤剂的效果。研究表明玉米淀粉与丙烯酰胺的质量比为5:3.5,引发剂硝酸铈铵用量为0.2g,反应时间为3h,反应温度为62℃,聚合物质量较好。     

在硅基材料上用Sol-gel法制备涂层测定氧扩散系数研究

提出一种测定氧扩散系数新方法。用Sol-gel法制备了Y2O3/SiO2均匀致密的薄膜,能成功解决其它方法无法得到的冶炼所得到的熔体,光学椭偏测定氧化层的膜厚。探讨了氧在薄膜中的扩散,在Wagner理论基础上,用数学方法表达在掺杂SiO2薄膜氧扩散系数与氧化层膜厚的关系。