中文全文检索系统截词检索的实现研究

本文探讨了在基于关键词索引的中文全文检索系统中实现各种截词检索的方法,建立了关键词索引的Hash索引,这种方法即能节省内存又提高检索效率。     

Syntactic based approach for grammar question retrieval

With the popularity of online educational platforms, English learners can learn and practice no matter where they are and what they do. English grammar is one of the important components in learning English. To learn English grammar effectively, it requires students to practice questions containing focused grammar knowledge. In this paper, we study a novel problem of retrieving English grammar questions with similar grammatical focus. Since the grammatical focus similarity is different from textual similarity or sentence syntactic similarity, existing approaches cannot be applied directly to our problem. To address this problem, we propose a syntactic based approach for English grammar question retrieval which can retrieve related grammar questions with similar grammatical focus effectively. In the proposed syntactic based approach, we first propose a new syntactic tree, namely parse-key tree, to capture English grammar questions’ grammatical focus. Next, we propose two kernel functions, namely relaxed tree kernel and part-of-speech order kernel, to compute the similarity between two parse-key trees of the query and grammar questions in the collection. Then, the retrieved grammar questions are ranked according to the similarity between the parse-key trees. In addition, if a query is submitted together with answer choices, conceptual similarity and textual similarity are also incorporated to further improve the retrieval accuracy. The performance results have shown that our proposed approach outperforms the state-of-the-art methods based on statistical analysis and syntactic analysis.     

案例检索以及案例库建设中的若干问题

本文介绍了新兴的检索方式——案例检索，并对案例库建设中存在的问题进行了探讨。     

《科学引文索文》(SCI)数据库的检索技巧

本文讨论了《科学引文索引》数据库的检索技术。针对五种不同的检索要求,结合实际的检索例子,制定出相应的检索策略,并说明了检索注意事项。     

论查新员业务素质在企业科技查新中的作用

为了使科技查新人员能够更好的完成企业的查新委托,提高自身的业务素质能力,本文主要从查新员与企业客户的沟通交流、数据库及网络资源的选择、查新课题查新点的提炼归纳以及查新结论的撰写4个方面,对查新员在查新工作中可能遇到的问题及其应具备的业务素质能力进行了论述,力争提高科技查新的质量,科学发展面向企业的科技查新工作。     

模糊理论在信息检索上的应用

模糊理论是为了解决真实世界中普遍存在的模糊现象而发展的一门学问，模糊理论以模糊集合为基础，基本精神是接受模糊性现象存在的事实，而以处理概念模糊不确定的事物为其研究目标，并积极地将其严密量化成计算机可以处理的信息。本文首先简介模糊理论，而后将模糊理论在信息检索上的应用做一探讨，希望通过本文，使大学对模糊理论有更深入的了解，并且思考如何将之更广泛地应用于图书信息学上。     

基于共词分析的中文信息检索可视化研究

说明了新的信息环境下将共词分析方法与信息检索可视化技术相结合的必要性,设计并实现了基于共词分析的中文信息检索可视化系统,对系统主要功能模块进行介绍,并对未来工作进行展望.     

社会化标注系统中标签检索质量模拟研究

社会化标注系统近年发展迅速,伴随出现的垃圾标注泛滥现象不容忽视。本文以社会化标注系统中标签检索质量为研究对象,细化普通用户标注行为,建立社会化标注模拟系统,明确定义系统内用户结构、标注规则、检索策略和检索质量算法,从实证角度评估用户规模变化、用户结构变化、用户标注量变化和垃圾用户的攻击策略选择对标签检索质量的影响。本文对于改善社会化标注系统中的标签检索算法以及提高用户体验具有重要意义。