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1.
[目的/意义] 要实现"一带一路"多语种共享型数据库资源的有效利用，必须解决跨语言检索问题，基于已建"一带一路"数据库检索功能调查结果，分析"一带一路"多语种共享型数据库检索功能需求，以调研跨语言检索平台为视角，为"一带一路"多语种共享型数据库的跨语言检索功能设计与开发提供参考。[方法/过程] 采用文献调研法和网络调研法，选取11个国内外典型的跨语言检索平台，从跨语言检索方法、跨语言翻译实现方法、检索功能设置、检索结果呈现、界面与检索支持语种6个方面进行分析，总结其实现方法。[结果/结论] 为"一带一路"多语种共享型数据库的跨语言检索功能设计与开发提出策略：应采用基于神经网络机器翻译的提问式-文献翻译方法，实现多种检索功能，应用可视化技术呈现检索结果，提供多语言检索界面和资源。 相似文献
2.
基于ISI与KNS服务平台的跨库检索比较 总被引：1，自引：0，他引：1
文章首先介绍了基于ISI检索平台与KNS服务平台的可跨库检索的数据库资源，然后分别介绍了它们的跨库检索方法，最后从最终用户的角度对这两个平台的跨库检索功能进行了比较分析，并指出它们各自的优势与不足。 相似文献
3.
万方《中国学位论文全文数据库——镜像版》检索方法和技巧 总被引：2，自引：0，他引：2
房文革 《图书馆工作与研究》2007,(3):72-72,75
本文概述了万方《中国学位论文全文数据库-镜像版》检索平台的特点，个性化组合检索方法、关联检索、二次检索、分类检索等检索方法和检索技巧。 相似文献
4.
5.
基于Windows平台构建OPAC检索机的研究与实现 总被引：1，自引：0，他引：1
李善杰 《现代图书情报技术》2007,2(12):74-77
针对大学图书馆OPAC检索机缺少专有的系统运行环境的状况，提出一种基于Windows平台构建OPAC检索机的解决方案。并从系统开发的角度，介绍设计和实现Windows平台上的OPAC检索机所要采取的步骤和方法。 相似文献
6.
在对最近升级的ISI Web of Knowkdge检索平台的信息资源进行简要介绍的基础上，对其新功能进行了详细介绍，认为升级后的平台使用户更容易、更有效率地对研究文献进行检索、排序和分析。 相似文献
7.
网络环境下数据库检索平台的评价 总被引：16，自引：0，他引：16
罗春荣 《图书馆理论与实践》2004,(4):1-4
分析了网络环境下数据库检索平台的特征与发展趋势 ,据此提出了网络环境下数据库检索平台的评价指标体系 ,最后讨论了数据库检索平台评价的基本原则和方法 相似文献
8.
基于ISI Web of Knowledge的BIOSIS Previews数据库探析 总被引：2，自引：0，他引：2
郭丽芳 《现代图书情报技术》2004,20(7):63-64
在分析BIOSIS Previews众多检索软件平台的基础上，重点探讨了基于ISI Web of Knowledge平台的BIOSIS Previews数据库特点及其检索方法。 相似文献
9.
国外全文电子期刊数据库检索平台比较研究 总被引：3，自引：0，他引：3
本文对国外全文电子期刊数据库检索平台Scitation、EJOS、Springer LINK及Wiley Inter Science在检索功能、检索结果处理、整合功能、个性化服务及管理功能等方面进行分析比较，对网络环境下外文电子期刊数据库检索平台进行评价并提出建议。 相似文献
10.
Ei Village 2和Web of Knowledge 数据库平台的比较分析 总被引：5，自引：0，他引：5
以INSPEC数据库为例，比较和分析了Ei Village 2和Web of Knowledge在检索功能、检索结果的处理、整合功能、个性化服务、检索效率及管理功能等方面的异同，并对网络环境下数据库检索平台的评价与选择提出了建议。 相似文献
11.
Charles L. A. Clarke Gordon V. Cormack Thomas R. Lynam Chris Buckley Donna Harman 《Information Retrieval》2009,12(6):680-694
Experiments were conducted to explore the impact of combining various components of eight leading information retrieval systems.
Each system demonstrated improved effectiveness through the use of blind feedback, also known as pseudo-relevance feedback, a form of query expansion. Blind feedback uses the results of a preliminary retrieval step to augment the efficacy of a
secondary retrieval step. The hybrid combination of primary and secondary retrieval steps from different systems in a number
of cases yielded better effectiveness than either of the constituent systems alone. This positive combining effect was observed
when entire documents were passed between the two retrieval steps, but not when only the expansion terms were passed. Several
combinations of primary and secondary retrieval steps were fused using the CombMNZ algorithm; all yielded significant effectiveness
improvement over the individual systems, with the best yielding an improvement of 13% (p = 10−6) over the best individual system and an improvement of 4% (p = 10−5) over a simple fusion of the eight systems. 相似文献
12.
针对Web信息检索现状和当前智能检索系统存在的问题，提出一个“先控”智能检索系统，面向基础用户，充分利用质量较高的网络资源分类目录体系，辅助形象化的“知识地图”显示，快速准确地定位用户的信息需求范畴，以提高检索效率和检索精度，同时分析了实现技术和尚待解决的问题。 相似文献
13.
Direct optimization of evaluation measures has become an important branch of learning to rank for information retrieval (IR).
Since IR evaluation measures are difficult to optimize due to their non-continuity and non-differentiability, most direct
optimization methods optimize some surrogate functions instead, which we call surrogate measures. A critical issue regarding
these methods is whether the optimization of the surrogate measures can really lead to the optimization of the original IR
evaluation measures. In this work, we perform formal analysis on this issue. We propose a concept named “tendency correlation”
to describe the relationship between a surrogate measure and its corresponding IR evaluation measure. We show that when a
surrogate measure has arbitrarily strong tendency correlation with an IR evaluation measure, the optimization of it will lead
to the effective optimization of the original IR evaluation measure. Then, we analyze the tendency correlations of the surrogate
measures optimized in a number of direct optimization methods. We prove that the surrogate measures in SoftRank and ApproxRank
can have arbitrarily strong tendency correlation with the original IR evaluation measures, regardless of the data distribution,
when some parameters are appropriately set. However, the surrogate measures in SVM
MAP
, DORM
NDCG
, PermuRank
MAP
, and SVM
NDCG
cannot have arbitrarily strong tendency correlation with the original IR evaluation measures on certain distributions of
data. Therefore SoftRank and ApproxRank are theoretically sounder than SVM
MAP
, DORM
NDCG
, PermuRank
MAP
, and SVM
NDCG
, and are expected to result in better ranking performances. Our theoretical findings can explain the experimental results
observed on public benchmark datasets. 相似文献
14.
针对目前信息服务机构只能提供文献的检索服务而不提供表格检索功能这一现状,提出一种基于向量空间模型的表格检索算法,并从表格特征抽取、特征词权值设置、检索结果匹配排序等方面进行讨论,为未来表格检索服务提供一定的理论依据。 相似文献
15.
一种面向用户兴趣的个性化语义查询扩展方法 总被引：1，自引：0，他引：1
在基于本体的语义查询扩展研究的基础上,结合用户模型的研究,提出要将用户的兴趣模型与查询扩展相结合,实现个性化的语义查询扩展,并把个性化的语义查询扩展过程分为两个阶段——检索关键词向用户模型中的个性化领域本体概念的映射以及在本体层次对映射概念的语义扩展,给出每一阶段的实现算法。实验表明该方法能够提高信息检索的查准率和查全率,在一定程度上满足个性化的查询需求。 相似文献
16.
邓汉成 《现代图书情报技术》1994,10(3):40-44
本文分析了福岛法的缺陷及其起因,提出了称为福岛+的新的运算法。并编成程序在AST 386微机上得到了实现。用本法AST 386微机上处理了300多个国际联机检索提问逻辑式,结果表明:用本法处理所需工作区最大占用数为5,而用福岛法有63%的提问式需占用5-7个工作区,并有17%的工作区溢出率。 相似文献
17.
We propose and describe Parameterized filesystem HITS (PFH), a lightweight rearrangement algorithm that performs a re-ranking of existing content-only search results in tree-like
hierarchical corpora, such as a filesystem. PFH does this by combining the content analysis of the results with structural
analysis of how they are organized. An α parameter is used to vary the structure-content bias, allowing us to observe changes
in performance when we place more emphasis on structure or on content. Using real and simulated data, experiments are provided
to show that α = 0.8 (i.e, 20% structure and 80% content) can substantially boost Mean Reciprocal Rank while keeping other
IR metrics steady. Such an algorithm may be useful for building retrieval systems over hierarchical content such as Desktop
Search, technical documents and books. 相似文献
18.
The Reliable Information Access (RIA) Workshop was held in the summer of 2003, with a goal of improved understanding of information
retrieval systems, in particular with regard to the variability of retrieval performance across topics. The workshop ran massive
cross-system failure analysis on 45 of the TREC topics and also performed cross-system experiments on pseudo-relevance feedback.
This paper presents an overview of that workshop, along with some preliminary conclusions from these experiments. Even if
this workshop was held 6 years ago, the issues of improving system performance across all topics is still critical to the
field and this paper, along with the others in this issue, are the first widely published full papers for the workshop. 相似文献
19.
In the present study we have tried to trace the growth of malaria research at Global Level and the distribution of articles in various journals for the period 1955–2005. The data have been extracted from a database, which has been developed in-house from MEDLINE, SCI, TDB, Ovid Heath Information and Indian Science Abstracts. Study indicates that the exponential model fits the data on journals, articles and authors. The R2 value for the trend for journals, articles, and authors are 0.9502, 0.9475, and 0.9651, respectively. The growth rates for journals, articles and authors are 5.31%, 7.38%, and 10.06%, respectively. The linear multiple regression equation that Articles = ?39.2771 + 3.61719*journals + 0.085882*Authors (R2 = 99.16%) is most meaningful and it may be used to estimate the articles for given numbers of journals and authors. 相似文献
20.
面向农民的问答系统问句处理研究* 总被引：1，自引：0，他引：1
为提高农民获取信息的便利性,文章着重面向农民问答系统的开发,提出问答系统由知识库构建、问句处理、信息检索、答案抽取4个模块组成,其中问句处理是研究重点。在总结农民问句特点的基础上,提出基于疑问词和短语的问句分类方法,并在问句处理过程中采用去除客气词、建立针对非正式疑问词和无疑问词时的“特殊规则表”等方法,以有效地进行问句归类及关键词提取。同时利用所构建的“同义词扩展词表”扩充关键词,并设定不同的权重基准,为信息检索模块的处理奠定基础。 相似文献