电子教学参考资料系统的研究及其基于JSP技术的设计

分析电子教学参考资料系统(Electronic Reserves system,ERes)的内涵和国内外的研究现状。给出系统必须具备的功能和特点,然后采用JSP+JavaBean的模式,设计出一个ERes系统。     

应用正则式抽取Google网页内容

正确、完整地抽取搜索网页的内容，是对检索到的信息进行处理的基本前提。本文分析了Google网页的结构特征，给出了一组匹配Google网页内容的正则式，并用Visual C# 实现了一个内容抽取器。对多个Google网页的实际应用表明，本文提出的正则式匹配方法可以抽取Google网页的全部主要内容。     

数字图书馆体系结构的发展

首先介绍了目前大多数数字图书馆所遵循的基本的数字图书馆体系结构，该结构在功能上可划分为四个逻辑组件：资源库、命名系统、索引／搜索系统、用户界面。然后介绍了NSDL、NCSTRL两个最大的数字图书馆项目在体系结构的关键问题方面的实践，最后，作者提出了数字图书馆体系结构发展的看法。     

ExpansionTool: Concept-Based Query Expansion and Construction

We develop a deductive data model for concept-based query expansion. It is based on three abstraction levels: the conceptual, linguistic and string levels. Concepts and relationships among them are represented at the conceptual level. The linguistic level gives natural language expressions for concepts. Each expression has one or more matching patterns at the string level. The models specify the matching of the expression in database indices built in varying ways. The data model supports a declarative concept-based query expansion and formulation tool, the ExpansionTool, for heterogeneous IR system environments. Conceptual expansion is implemented by a novel intelligent operator for traversing transitive relationships among cyclic concept networks. The number of expansion links followed, their types, and weights can be used to control expansion. A sample empirical experiment illustrating the use of the ExpansionTool in IR experiments is presented.     

基于隐马尔科夫模型的中文术语识别研究

基于对中文文本信息语法构成尤其是词性搭配的概率特征的分析,提出一种基于双层隐马尔科夫模型的中文泛术语识别和提取的思路和系统框架,并实现相关系统,基于训练语料对多个领域的文本信息进行术语提取测试。实验结果表明,所提出的基于隐马尔科夫模型的中文泛术语识别和提取思想具有较好的实践参考意义。     

基于改进内容过滤算法的高校图书馆文献资源个性化推荐研究

[目的/意义]基于内容的过滤推荐中,针对向量空间模型表示文本时容易造成维度灾难的问题,提出利用余弦值r与匹配度值Sim相结合的方法对原有模型进行改进。[方法/过程]由文献资源和用户兴趣分别筛选出权重较大特征词的词向量,进而由公式计算余弦值r,结合对应的特征词权重进一步计算出匹配度值Sim,将其作为向目标用户推荐文献的依据,并利用河北工业大学图书馆的相关数据对改进模型、向量空间模型及LDA主题模型进行实验,最后利用查准率、召回率、F1值及运行时间等评价指标对3种模型的实验结果进行分析。[结果/结论]实验结果表明所提出的改进模型相比较于实验中的向量空间模型与LDA主题模型具有更高的应用价值与运行效率。     

Knowledge-Enhanced Latent Semantic Indexing

Latent Semantic Indexing (LSI) is a popular information retrieval model for concept-based searching. As with many vector space IR models, LSI requires an existing term-document association structure such as a term-by-document matrix. The term-by-document matrix, constructed during document parsing, can only capture weighted vocabulary occurrence patterns in the documents. However, for many knowledge domains there are pre-existing semantic structures that could be used to organize and categorize information. The goals of this study are (i) to demonstrate how such semantic structures can be automatically incorporated into the LSI vector space model, and (ii) to measure the effect of these structures on query matching performance. The new approach, referred to as Knowledge-Enhanced LSI, is applied to documents in the OHSUMED medical abstracts collection using the semantic structures provided by the UMLS Semantic Network and MeSH. Results based on precision-recall data (11-point average precision values) indicate that a MeSH-enhanced search index is capable of delivering noticeable incremental performance gain (as much as 35%) over the original LSI for modest constraints on precision. This performance gain is achieved by replacing the original query with the MeSH heading extracted from the query text via regular expression matches.     

基于虚本体构建的网格领域本体匹配研究

现有的语义网格信息检索过程,实际上只是用户请求的某些概念描述与网格本体的匹配,无法做到真正的本体与本体之间的匹配。在充分研究现有网格本体匹配算法的基础上,提出构造网格虚本体来形式化描述用户需求,即通过网格领域虚本体的构造为网格本体的匹配做铺垫,同时利用本体分层和图匹配来提高匹配的准确率, 并对其匹配模式和匹配算法都有相应的改进和提高。     

Ultrasonic phased array technology for the non-destructive testing of marble sculptures

The medical ultrasonic phased array technology was modified for the non-destructive testing of marble sculptures and the feasibility of the approach was evaluated. For this purpose, 1?MHz, 64-channel phased array electronic and phased array transducers were developed. The specifications of the electronics and the transducers are presented and discussed. Ultrasound images of inner structures of a marble sculpture are presented. The problem of the acoustic matching layers for different states of deterioration is discussed and the developments in view of a suitable matching layer solution are presented. This matching layer is combined with a new coupling technique that protects the marble surface. The results of experiments on ultrasound phantoms and on a marble sculpture are presented.     

论竞争情报的研究内容

竞争情报研究涉及的全部内容可以分为 3个主要层面 :竞争情报理论研究层面、方法技能层面、应用推广层面。每个层面又包括若干具体内容。 3个层面互为依托 ,相互推动 ,共同消长 ,构成了完整的竞争情报理论体系。参考文献 6     

面向应用的汉语句法分析辅助系统的设计与实现

汉语句法分析是汉语研究和中文信息化处理中的一个关键环节，同时也是难点之一，面向汉语句法分析的辅助系统能为这个领域的研究与实践带来便利。本文概述了句法分析辅助系统的体系结构和基本功能，详细分析了系统实现中的两个关键算法，即括号匹配算法和句法解析算法，初步实验结果表明辅助系统效果良好，达到设计目的。     

基于代数理论的信息检索模型及其推广

在信息检索中，代数理论是构建检索模型的重要手段之一，以代数理论为基础的检索模型克服了布尔模型不能进行部分匹配的缺点而广为采用。本文分析了代数理论的向量空间模型，并对该模型进行了扩展：用最小项标引词以反映词与词之间的关系,用奇异值分解来捕捉文献的语义结构；最后对这三种模型进行了比较。     

面向数据网络的信息组织演变发展

数据与数据之间通过富含语义链接的方式形成了有价值的数据网络,在以语义网为核心的网络架构中,网络资源的语义化结构、细粒度描述、数据关联等特性对数据加工及利用提出了新的挑战,信息组织的处理对象及外延发生着变化,信息组织工具不断丰富且功能趋于统一。本文依据信息组织的不同功能和处理流程可以将其细分为资源层、元数据记录层、词表层,分别对各个层次的特点、变化及其未来发展进行分析,认为从文本中准确提取出反映语义含义的特征项是当前信息组织的关键问题,元数据集、知识组织系统成为词表的主要构成,知识组织系统呈现出描述对象概念化、语义关系多样化、描述语言形式化、数据开放关联性四大特点。图3。参考文献23。     

开放资源互操作框架研究

首先,根据不同权益方及其系统在互操作中扮演的角色与作用将开放资源互操作活动参与者归纳为内容提交者、内容管理与发布者、内容消费者及服务支持者4类角色,并据此提出开放资源互操作的内容组成框架,描述和总结各自的目标、功能和实例;其次,在对开放资源互操作已有的各类协议、标准功能抽象的基础上,提出开放资源互操作4层协议参考模型,分别界定各层提供的服务、接口,并列举典型代表;最后,进一步分析和比较几种主要的互操作技术原理、机制及应用需求。     

基于智慧服务的图书馆阅读推广服务研究

本文以学术型图书馆开展阅读推广服务为对象,主张创建基于智慧服务的自动向读者推荐馆内资源的阅读推广服务系统。该系统包含教育层、增强层、预测层,可提供九项针对科研工作的参考咨询服务和六项推荐阅读服务。其中,教育层是基础层,增强层是关键要素,预测层是顶层。预测层使用教育层和增强层过滤个人需求信息,准确发现与预测读者阅读需求,实现阅读推荐服务,为教学和科研工作提供定性的信息支持。     

Beyond Walter Cronkite’s “And That’s The Way It Is”

Television anchors are key public figures in the American news media, vital for the ratings success of their outlets. This study uses content analysis and framing theory to examine US network news anchors’ role at a pivotal career moment—the last minutes in the all-powerful anchor chair—their swan songs. These final words are examined for messages as anchors express gratitude, sum up careers, provide journalism insights, and pronounce final words of wisdom. The textual analysis revealed several dominant frames—becoming one with the audience, expressions of gratitude to staff and viewers, the anchors’ perception of their historical role noting predecessors and successors, and insightful wisdom about journalism’s role in society. The visual analysis showed a style reinforcing a professional presence, signaling authority, and objectivity. Each American lodestar anchor was different, yet they were similar in how they said goodbye and how they wanted to be remembered.     

图书馆危机管理能力评价指标体系的构建

[目的/意义]构建图书馆危机管理能力评价指标体系,为评估图书馆危机管理能力提供参考。[方法/过程]在理论分析基础上提出初始图书馆危机管理能力评价指标体系,利用德尔菲法修正相关指标,并确定最终图书馆危机管理能力评价指标体系。[结果/结论]图书馆危机管理能力评价指标体系由3个一级指标、9个二级指标和29个三级指标组成。利用29个三级评价指标及其合成权重,可构建图书馆危机管理能力的函数表达式,并计算其大小。     

图书馆人才需求与图书馆学教育

主要以亚马逊和邦诺网上书店为参照,根据网上书店的业务特点和顾客的需求,提出网上书店应具备的基本功能和网上书店的测评指标,并对国内外8个有代表性的网上书店进行比较和测评,从而揭示国内网上书店存在的不足,指出今后应努力的方向和注意的问题。     

基于PostgreSQL的TMX数据存储研究与语料检索平台实现

分析语料存储系统的架构和不足,研究语料存储结构以及相应的检索匹配算法,对系统实现的功能进行描述。旨在探索语料检索系统在更深层次进行语料处理的途径以及证明其可行性。     

Developing an assessment index for collection-user suitability: Application of information entropy in library science

What is lacking from the literature and practice of library print collection assessment is a mathematical function that can integrate variables and quantify the overall measurement of the collection as a final score for the library science practitioners and administrators. The study uses the information entropy to explain a mathematical procedure on how to define variables from the regular circulation statistics. Based on the assessment concepts of circulation statistics and user behavior, the study explores to develop mathematical functions and proposes a Collection-User Suitability index to quantify the suitability measurement of the overall collection and the user intention. The study then considers the extreme conditions to validate the functions and verifies the application of the function via empirical and simulated data. Finally, the authors developed a computing tool and uploaded it to GitHub for free access based on the study's results. It is hoped that library science practitioners and administrators can utilize the mathematical function.