Parsimonious translation models for information retrieval     

Seung-Hoon Na  In-Su KangJong-Hyeok Lee 《Information processing & management》2007

In the KL divergence framework, the extended language modeling approach has a critical problem of estimating a query model, which is the probabilistic model that encodes the user’s information need. For query expansion in initial retrieval, the translation model had been proposed to involve term co-occurrence statistics. However, the translation model was difficult to apply, because the term co-occurrence statistics must be constructed in the offline time. Especially in a large collection, constructing such a large matrix of term co-occurrences statistics prohibitively increases time and space complexity. In addition, reliable retrieval performance cannot be guaranteed because the translation model may comprise noisy non-topical terms in documents. To resolve these problems, this paper investigates an effective method to construct co-occurrence statistics and eliminate noisy terms by employing a parsimonious translation model. The parsimonious translation model is a compact version of a translation model that can reduce the number of terms containing non-zero probabilities by eliminating non-topical terms in documents. Through experimentation on seven different test collections, we show that the query model estimated from the parsimonious translation model significantly outperforms not only the baseline language modeling, but also the non-parsimonious models.  相似文献   

The dynamics of technological change in UK retail banking services: An evolutionary perspective   总被引：1，自引：0，他引：1  

Davide Consoli 《Research Policy》2005,34(4):461-480

The purpose of this paper is to elaborate an evolutionary perspective on the process of structural change that has characterized the banking industry in the United Kingdom (UK). For this purpose, the evolution of retail financial services is contrasted against the backdrop of the implementation and development of information and communication technologies (ICTs). The paper delves into the sources and the effects of technological change in banking over a long-term perspective (1840s-1990s) to point out the significance of the opportunities and the constraints that have shaped the growth and development of this industry. This is interpreted as a three-stage evolutionary process driven by intertemporal coordination across several complementary domains, including activities of production, business organization, consumption and the underlying regulatory setting. It is concluded that the evolution of UK retail banking displays the characteristics of a distributed process of innovation in which developers of technologies, service suppliers and customers contribute to the process of structural change of the industry.  相似文献   

企业信息能力基本框架研究   总被引：9，自引：1，他引：9  

余彩霞 《情报科学》2003,21(10):1113-1115

面对国际国内激烈的竞争环境和市场的进一步开放，本文从企业生存与发展的战略高度出发，分析了企业信息能力的基本框架．它包括企业信息能力的评价标准，企业信息能力的作用，中外企业在信息能力方面的差距和提高企业信息能力的建设．  相似文献   

高等师范院校化学实验教学改革与探索     

梁讯  任祥忠 《技术与创新管理》2006,27(5):69-70,73

全面剖析了高等师范院校化学实验课程教学中存在的问题,从优化实验教学内容,改革实验教学手段,变革实验成绩考核办法,加强实验教学的师资力量等方面,探讨了如何培养学生的创新能力,全面推进素质教育。  相似文献   

A review of ontology based query expansion     

J. Bhogal  A. Macfarlane  P. Smith 《Information processing & management》2007

This paper examines the meaning of context in relation to ontology based query expansion and contains a review of query expansion approaches. The various query expansion approaches include relevance feedback, corpus dependent knowledge models and corpus independent knowledge models. Case studies detailing query expansion using domain-specific and domain-independent ontologies are also included. The penultimate section attempts to synthesise the information obtained from the review and provide success factors in using an ontology for query expansion. Finally the area of further research in applying context from an ontology to query expansion within a newswire domain is described.  相似文献   

高校信息意识教育研究     

袁桂琴  宛玲 《情报科学》2001,19(12):1242-1245

信息化社会要求高校培养具有创新精神和初中能力的现代型人才，而信息意识又是创新精神和实践能力提高与发展的基础，针对目前我国高校信息意识教育比较滞后的现状，本文在指出信息意识教育的重要性的同时，着重探讨了在高校开展信息意识教育的具体内容和实施的途径。  相似文献   

贸易技术壁垒的博弈分析   总被引：9，自引：0，他引：9  

鲁文龙  陈宏民 《预测》2003,22(4):62-64

本文明确提出最小质量标准(MQS)可以作为贸易技术壁垒(TBT)来考虑，因为贸易技术壁垒的实质就是设定一个高于进口产品质量的标准，以阻碍进入。在此前提下，本文首先考虑了在一个开放的经济体中．企业的利润及社会福利随MQS的变化情况。其次，对开放和封闭经济体中的MQS作了比较。结果表明，输入国政府设定最小质量标准，会使得生产低质量产品的进入企业利润增加，生产高质量产品的在位企业利润减少．但输入国消费者剩余提高，且消费者剩余的增加幅度要大于本国企业利润的减少，因此社会福利增加，输入国政府有动机设定最小质量标准。  相似文献   

Information-Based Global Economy and Socioeconomic Development: The Case of Bangalore     

Shirin Madon 《The Information Society》1997,13(3):227-244

  相似文献   

基于XML的信息组织与处理：2．应用技术   总被引：2，自引：0，他引：2  

张晓林 《情报科学》2001,19(9):964-971,983

本文介绍基于XML的基础数据与应用文献标记、地数据及知识体系标记、基于XML的应用领域信息处理与交换框架建设，并分析XML在图书情报领域中的应用以及XML对图书情报领域的挑战。  相似文献   

试论实验技术队伍建设     

山颖 《中国科技信息》2007,(16):185-186

实验技术人员的素质和整体效能关系到培养合格人才的问题，还直接影响到实验教学和科研工作的效果。因此．加强高校实验技术队伍整体素质建设，探讨提高实验技术人员水平的途径和建设高素质实验技术队伍的措施是非常必要的。  相似文献