A Novel Web Query Automatic Expansion Based on Rough Set

0 IntroductionSearchingthe webis not always sosuccessful as users expect .Most of the retrieved sets of documents in a web searchmeet the search criteria but do not satisfy the user’s needs. Onecrucial reasonis that users generallylack of specificityin the for-mulation of the queries.Some causes of this are that most of theti mes ,the user does not knowthe vocabulary of thetopic,or que-ryterms do not come to user’s mind at the query moment .One possible solutiontothis problemis the process …     

ERP instantaneous synchronization analysis based on cross approximate entropy

A complexity estimating algorithm, cross approximate entropy (Cross-ApEn), was developed to analyze the instantaneous synchronization of cognitive ERPs, which could indicate the interactions of different brain regions during selective attention tasks. In order to illustrate the validity of Cross-ApEn’s reflection of instantaneous synchronization, cross covariance was also calculated to compare with the final result. Two main phenomena can be noticed from this investigation: (1) The Cross-ApEn of electrode pairs over frontal and parietal areas became lower during the response period (0—400 ms) in both incongruent and congruent situations. (2) It was shown that Cross-ApEn presents lower value in incongruent situation than that in congruent one during response period (0—400 ms) at most electrode pairs. These results demonstrated that Cross-ApEn is effective to evaluate ERPs’ instantaneous synchronization designating the cooperation of different brain regions and may bring a new view to cognitive neural imaging and recognition.     

基于B/S的交互式数据查询的一种方法

运用Dreamweaver的动态网页制作技术,以微软的.NET为开发平台,采用B/S结构,以SQL Server 2000作为后台数据库服务器,以ASP.NET组件ADO.NET访问数据库,实现了一种B/S的数据库查询.     

ERP instantaneous synchronization analysis based on cross approximate entropy

A complexity estimating algorithm, cross approximate entropy (Cross-ApEn), was developed to analyze the instantaneous synchronization of cognitive ERPs, which could indicate the interactions of different brain regions during selective attention tasks. In order to illustrate the validity of Cross-ApEn’s reflection of instantaneous synchronization, cross covariance was also calculated to compare with the final result. Two main phenomena can be noticed from this investigation: (1) The Cross-ApEn of electrode pairs over frontal and parietal areas became lower during the response period (0—400 ms) in both incongruent and congruent situations. (2) It was shown that Cross-ApEn presents lower value in incongruent situation than that in congruent one during response period (0—400 ms) at most electrode pairs. These results demonstrated that Cross-ApEn is effective to evaluate ERPs’ instantaneous synchronization designating the cooperation of different brain regions and may bring a new view to cognitive neural imaging and recognition.     

灰函数的Neville白化逼近与并行算法设计

将插值问题中著名的Neville方法引入到灰函数的白化过程之中,研究一种介于“充足信息”与“贫信息”之间的一种折衷的函数逼近方法,这种方法不仅将贫信息问题的处理过程程序化,而且还为并行计算提供了一种可行的方案。     

矩形排水暗沟断面尺寸的计算

本文提出计算矩形断面排水暗沟合理宽度的公式,并推导出了当宽度(或水深)一定时,水深(或宽度)的近似计算公式,例举了其在工程设计中的应用。     

W^22（D）空间函数的近似再生

本文介绍一个具有再生核的函数Ｈｉｌｂｅｒｔ空间Ｗ＾２２（Ｄ）并给出了该空间再生核函数表达式。利用它构造Ｗ＾２２（Ｄ）空间上函数ｕ（Ｍ）的近似再生函数ｕｎ（Ｍ），随着再生核函数项数ｎ的增加，近似再生函数的误差在Ｗ＾２２（Ｄ）空间范数意义下单调下降且趋于零。     

考虑管理人因素的风险项目期权估值方法研究

基于对风险项目及其“孪生证券”风险和收益特性的分析，认为真正的“孪生证券”实际中很难存在，进而提出利用“近似孪生证券”与无风险证券的构造资产组合来复制实物期权收益特征，利用无风险磁利分析确定项目实物期权价值的方法。考虑管理人因素造成的实物期权内部风险特征的不可复制性，利用“确定性等值”将内部风险价值V1具体化，对“近似孪生证券”方法进行了修正。     

Active Server Pages与数据库接口探析

使用Active Server Pages技术，通过ASP页面与数据库进行连接，并实现查询、修改、删除等功能。     

试题库管理系统

本文介绍了考务管理信息系统的功能和特点重点论述了试题库管理信息系统的设计思想、实现方法。充分合理应用了系统软件程序库，大大加强了通用数据库的功能。