数据库安全进展研究

对数据库安全及研究现状进行了详细阐述．并对其研究方向提出了几点建议．     

An application of document filtering in an operational system

This paper describes an applied document filtering system embedded in an operational watch center that monitors disease outbreaks worldwide. At the initial time of this writing, the system effectively supported monitoring of 23 geographic regions by filtering documents in several thousand daily news sources in 11 different languages. This paper describes the filtering algorithm, statistical procedures for estimating Precision and Recall in an operational environment, summarizes operational performance data and suggests lessons learned for other applications of document filtering technology. Overall, these results are interpreted as supporting the general utility of document filtering and information retrieval technology and offers recommendations for future applications of this technology.     

基于因素空间理论的领域知识表示及推理

知识表示及其推理是研究知识集成服务的关键技术。本文研究了3个核心问题：一是模糊逻辑知识表示方法;二是将因素空间理论应用于与具体资源相关领域中的知识表示,实现统一的知识表示方法;三是对基于因素空间理论的知识表示方法进行运用,基于这种表示方法实现真值流知识推理机制,为实现语法层面的知识集成提供理论基础。

Abstract：

Knowledge representation and its inference are the key technologies for the research on integrated knowledge service.This paper studies 3 core issues： the knowledge representation method of fuzzy logic;applying the theory of factor space to the knowledge representation in the domain related to specific resources to realize the unified way of knowledge representation;using the knowledge representation method based on the theory of factor space to realize the truth-valued-flow knowledge inference mechanism so as to provide the theoretical basis for the knowledge integration at the syntax layer.     

基于双向拍卖模型的农地流转交易研究

在农地流转市场中,拥有农地承包经营权的农户是卖方,对农地有需求的组织或个人是买方,政府或中介服务机构可视作拍卖商.为模型化这种经济定价机制,建立了一个双向拍卖模型,首先买卖双方分别报价,然后拍卖商根据双方报价确定成交价格,最后在这一价格下完成交易.模型的均衡分析表明,双向拍卖机制能够实现事后帕累托效率改进.进一步,比较静态分析表明,需求、供给和制度因素对农地流转交易成功的概率有影响,因此,政府可以通过选择适当的对农户利益关心程度来最大化农地流转交易成功的概率.     

论公民的体育权利

通过对公民权利内涵和体育需求发展的分析,以及对公民体育权利法律规定的有关论述,揭示了体育权利已成为现代公民权利体系的一项重要内容。进而提出,确认并保障公民的体育权利,反映了当代国际上体育立法的一种趋向,更应作为我国社会主义体育立法的根本目的和主要任务。     

基于网络入侵监测系统的一种新模型

入侵检测技术IDS是一种主动保护自己免受攻击的一种网络安全技术.它能够帮助系统对付网络攻击,扩展了系统管理员的安全管理能力(包括安全审计、监视、攻击识别和响应),提高了信息安全基础结构的完整性.本文对早期网络入侵检测系统模型的分析上的基础上,提出了一种新型入侵检测模型,从而尽最大可能减少误报和漏报情况的发生,大大提高入侵检测系统的有效性.     

Bayes统计与经典统计方法及其在水文水资源中的应用

对 Bayes统计和经典统计方法的基本思想、理论基础做了较全面的比较 ,指出了二者的主要差异在于信息的利用和概率假设上。二者的相似之处在于它们的统计推断思想基础一致 ,都是基于似然函数。此外 ,还就二者在水文水资源分析中的应用做了说明。     

Another Look at the Logical Uncertainty Principle

The Logical Uncertainty Principle is re-examined from the point of classical logic. Two interpretations are given, an objective one in terms of an axiomatic theory of information, and a subjective one based on Ramsey's theory of probability.     

Web性能测试与预测

讨论了Web应用的性能测试方法和测试工具,并在一个Web应用的实例中给出了运用这些工具和方法的测试过程,以及对测试结果的分析.设计了一种基于转导推理的预测算法,基于有限的历史测试数据,对系统的性能进行预测,并取得了接近实测的预测效果.还根据测试结果简要分析了对Web应用性能进行优化的一般方法.     

A new decision to take for cost-sensitive Naïve Bayes classifiers

Practical classification problems often involve some kind of trade-off between the decisions a classifier may take. Indeed, it may be the case that decisions are not equally good or costly; therefore, it is important for the classifier to be able to predict the risk associated with each classification decision. Bayesian decision theory is a fundamental statistical approach to the problem of pattern classification. The objective is to quantify the trade-off between various classification decisions using probability and the costs that accompany such decisions. Within this framework, a loss function measures the rates of the costs and the risk in taking one decision over another.