提高网络环境下的检索效率

围绕查全率、查准率这两个重要指标对网络环境下影响检索效率的因素进行了分析,提出提高网络环境下检索效率的一些方法,以便更好地服务于用户.     

湖北省高校科技成果转化的现状调查与分析

通过对高校科技工作管理者、高校教师以及部分企业的调研发现,目前影响湖北省高校科技成果转化的因素主要是政府管理、资金投入、高校观念转变与机制创新、企业重视等方面,并提出相应的对策与建议.     

Bayesian networks for imputation

Summary.  Bayesian networks are particularly useful for dealing with high dimensional statistical problems. They allow a reduction in the complexity of the phenomenon under study by representing joint relationships between a set of variables through conditional relationships between subsets of these variables. Following Thibaudeau and Winkler we use Bayesian networks for imputing missing values. This method is introduced to deal with the problem of the consistency of imputed values: preservation of statistical relationships between variables ( statistical consistency ) and preservation of logical constraints in data ( logical consistency ). We perform some experiments on a subset of anonymous individual records from the 1991 UK population census.     

网络防火墙技术应用分析

介绍了防火墙的概念、组成原理及几种典型的防火墙系统,对如何加强防火墙的防护作用进行了分析。     

知识经济背景下高等教育改革

知识经济是以知识为基础,以科技为核心,以人力资源为依托,建立在知识的生产、创新、流通、分配和应用上的经济模式,同时又是信息化、网络化、创新化和智力化的新型经济形态.知识经济作为一个新经济形态,为高等教育提供了广阔的发展空间,知识经济的发展依赖于教育的发展.我们要注重教育方式的变革,提高学生对知识创新能力的培养,使学生具有独立获取知识的能力,具有开拓精神,使我们的高等教育培养出千千万万知识经济时代需要的高级人才.     

Diagnostics for dependence within time series extremes

Summary. The analysis of extreme values within a stationary time series entails various assumptions concerning its long- and short-range dependence. We present a range of new diagnostic tools for assessing whether these assumptions are appropriate and for identifying structure within extreme events. These tools are based on tail characteristics of joint survivor functions but can be implemented by using existing estimation methods for extremes of univariate independent and identically distributed variables. Our diagnostic aids are illustrated through theoretical examples, simulation studies and by application to rainfall and exchange rate data. On the basis of these diagnostics we can explain characteristics that are found in the observed extreme events of these series and also gain insight into the properties of events that are more extreme than those observed.     

网络环境下图书馆信息服务创新初探

信息资源网络化给图书馆的生存和发展带来了巨大的冲击,图书馆惟有创新才有出路。本文提出转变观念是信息服务创新的前提;加强网络信息资源的开发利用是信息服务创新的基础;技术创新是信息服务创新的手段;高素质的图书馆员是信息服务创新的关键。     

日本都道府县防灾无线网的建设及借鉴

日本是世界上灾害管理通信系统建设领先的国家,相关经验对我国灾害管理通信系统的建设有着重要的借鉴意义。都道府县防灾无线网是日本灾害管理通信系统的重要组成部分,已具备了较为成熟的建设模式和应用经验。本文介绍了日本灾害管理通信系统的框架、都道府县防灾无线网的体系架构及其通信系统组成,选择了神奈川县、长野县和三重县作为典型案例,对这三个县的防灾无线网的建设和应用情况作了分析,并借鉴日本的经验,结合我国的实际,提出了五个方面的建设建议。     

法律环境的不确定性制约我国股指期货的推出

我国股指期货推出的法律环境面临诸多不确定因素,一方面,《证券法》、新《期货交易管理条例》、《关于审理期货纠纷案件若干问题的规定》、《刑法》和新《破产法》、《中国金融期货交易所交易规则》的颁布和修订,为强化市场监管提供了强有力的法律依据;另一方面,现有法律体系在交易所规则的效力、会计制度、税收制度、净额结算、交易所的性质、透支交易、交易信息的送达、期货公司的举证责任、涉外期货等方面规定不明确,应对相关法律进行修改、梳理和完善,并在刑法典中增加虚假陈述罪、非法经营期货业务罪、泄漏内幕信息罪和挪用期货保证金罪等内容。     

Efe fathers: one among many? A comparison of forager children's involvement with fathers and other males

The study reported describes Efe (pygmy) forager one-, two-, and three-year-olds' involvement with males. The Efe of northeastern Zaïre were chosen because their social organization allows us to examine hypotheses based on studies in Western, technologically complex societies about the distinctive role fathers play in the lives of their young children. Behavioral observations of Efe children's day-to-day activities with fathers, men and boys were recorded using a focal subject sampling technique (Altmann, 1974). Two behavioral measures were created to capture the extent to which males were involved with children: Social engagement describes males' involvement with children and social attention describes eavesdropping by children on males' everyday activities. Eight one-year-olds, 7 two-year-olds and 8 three-year-olds were each observed for six, one-hour observation sessions that were distributed evenly over the daylight hours. Data were analyzed using the traditional measure of involvement (e.g., adult males) and using a newly developed measure of the involvement of the average individual (e.g., average adult mate). Comparisons at each of the ages showed that fathers were consistently like other men in the extent to which children participated in social activities with them and watched their activities. Only fathers' level of social engagement declined significantly as children grew older. Boys' role relative to other males became increasingly distinctive as children aged. The findings suggest that Efe fathers may not be unique in the same sense assumed by Western study ideals, and raise questions about the special status given to fathers in Western theory and data. The patterning of mate involvement with children is discussed in terms of Efe community life, and in terms of Efe children's developing understanding of their relationship with fathers and other males.