网络主机脆弱性分析

本文提出了一种基于Agent的网络主机脆弱性分析框架，通过分布在各主机中的Agent对网络主机脆弱性度量进行收集，然后分析在不同网络攻击阶段的脆弱性度量值变化状况。通过该脆弱性评估框架，不仅分析了网络主 机的脆弱性状况、模拟了网络攻击过程，而且为进一步的网络安全防范奠定了基础。     

一种基于可用带宽的QoS多播路由算法

设计一个加权最大可用带宽多播树求解模型,将可用带宽作为主度量并同时兼顾时延、时延抖动和包丢失率3个QoS约束构建多播树.各QoS度量的重要性可根据实际的服务需求灵活调整,算法具有多项式复杂度,并通过仿真证明其有效性.     

IP网端到端性能测量技术研究的进展

本文介绍了Internet端到端测量技术的最新进展,包括性能拓扑推测、时延测量、丢包率测量.最后讨论了未来Internet端到端测量的研究趋势和应用前景.     

Control design for recycled, multi unit processes

An integrated multi-unit chemical plant presents a challenging control design problem due to the existence of recycling streams. In this paper, we develop a framework for analyzing the effects of recycling dynamics on closed-loop performance from which a systematic design of a decentralized control system for a recycled, multi-unit plant is established. In the proposed approach, the recycled streams are treated as unmodelled dynamics of the “unit” model so that their effects on closed-loop stability and performance can be analyzed using the robust control theory. As a result, two measures are produced: (1) the ν-gap metric, which quantifies the strength of recycling effects, and (2) the maximum stability margin of “unit” controller, which represents the ability of the “unit” controller to compensate for such effects. A simple rule for the “unit” control design is then established using the combined two measures in order to guarantee the attainment of good overall closed-loop performances. As illustrated by several design examples, the controllability of a recycled, multi unit process under a decentralized “unit” controller can be determined without requiring any detailed design of the “unit” controller because the simple rule is calculated from the open-loop information only.     

Linear transform for simultaneous diagonalization of covariance and perceptual metric matrix in image coding

Two types of redundancies are contained in images: statistical redundancy and psychovisual redundancy. Image representation techniques for image coding should remove both redundancies in order to obtain good results. In order to establish an appropriate representation, the standard approach to transform coding only considers the statistical redundancy, whereas the psychovisual factors are introduced after the selection of the representation as a simple scalar weighting in the transform domain.In this work, we take into account the psychovisual factors in the definition of the representation together with the statistical factors, by means of the perceptual metric and the covariance matrix, respectively. In general the ellipsoids described by these matrices are not aligned. Therefore, the optimal basis for image representation should simultaneously diagonalize both matrices. This approach to the basis selection problem has several advantages in the particular application of image coding. As the transform domain is Euclidean (by definition), the quantizer design is highly simplified and at the same time, the use of scalar quantizers is truly justified. The proposed representation is compared to covariance-based representations such as the DCT and the KLT or PCA using standard JPEG-like and Max-Lloyd quantizers.     

面向对象软件度量技术

提出了OO度量评价规则和标识一组OO度量套件的方法，一组切实可行的OO度量套件及其形式化描述方法，评价OO关键概念和结构特性。质量度量模型是软件质量评价体系中的关键技术，采用层次结构的度量模型。通过质量度量模型，就建立了软件内部属性和外部属性间的客观的定量的联系。OO软件度量框架用以规范化地帮助评测软件产品质量的过程。     

D-Index: Distance Searching Index for Metric Data Sets

In order to speedup retrieval in large collections of data, index structures partition the data into subsets so that query requests can be evaluated without examining the entire collection. As the complexity of modern data types grows, metric spaces have become a popular paradigm for similarity retrieval. We propose a new index structure, called D-Index, that combines a novel clustering technique and the pivot-based distance searching strategy to speed up execution of similarity range and nearest neighbor queries for large files with objects stored in disk memories. We have qualitatively analyzed D-Index and verified its properties on actual implementation. We have also compared D-Index with other index structures and demonstrated its superiority on several real-life data sets. Contrary to tree organizations, the D-Index structure is suitable for dynamic environments with a high rate of delete/insert operations.     

多变量鲁里叶系统鲁棒输入、输出稳定性的Gap度量界

本文讨论了多变量鲁里叶系统鲁棒输入，输出稳定性问题，文中利用Ｇａｐ度量作为系统中非结构型摄动的测量手段，给出了当系统线性部分的摄动量和Ｇａｐ度量满足某种估计式，同时非线性部分的扇形斜率也受到某种类型摄动时，闭环系统仍能保持稳定的若干充分条件。     

一个软件质量评价系统的设计与实现

文中介绍了一个基于国家标准的软件质量度量模型和评价过程模型（简称ＪＴ－ＳＱＥ模型）的设计思想和主要技术，度量模型为四层次树形结构，评价过程及需求定义，度量和计分三步步骤，该模型为评价软件质量提出了一套可行的评价体系，并简单介绍了基于该模型的软件质量评价工具的结构和功能。     

基于ZEUS的主体度量

在软件工程领域，主体系统的设计和开发受到越来越多的关注。但是传统的软件度量技术和面向对象的软件度量技术不适用于对主体系统的分析，而影响主体系统质量的主要因素是复杂度和知识能力。文中结合ZEUS主体系统，采用FSM框架给出主体复杂度和知识能力的度量指标以及度量主体。