一种新型的网络搜索引擎模式——专家咨询搜索引擎     

应峻 《现代图书情报技术》2003,(Z1)

介绍了一种新型的专家咨询搜索引擎模式 ,以 Ask Me.com为例说明专家咨询搜索引擎的特点及使用方法  相似文献   

Das MINERVA-Projekt: Datenbankselektion für Peer-to-Peer-Websuche     

Matthias Bender  Sebastian Michel  Gerhard Weikum und Christian Zimmer 《Informatik - Forschung und Entwicklung》2005,20(3):152-166

Zusammenfassung In diesem Artikel wird MINERVA pr?sentiert, eine prototypische Implementierung einer verteilten Suchmaschine basierend auf einer Peer-to-Peer (P2P)-Architektur. MINERVA setzt auf die in der P2P-Welt verbreitete Technik verteilter Hash-Tabellen auf und benutzt diese zum Aufbau eines verteilten Verzeichnisses. Peers in unserem Ansatz entsprechen v?llig autonomen Benutzern mit ihren lokalen Suchm"oglichkeiten, die bereit sind, ihr lokales Wissen und ihre lokalen Suchm?glichkeiten im Rahmen einer Kollaboration zur Verfügung zu stellen. Wir formalisieren unsere Systemarchitektur und beschreiben das zentrale Problem einer effizienten Suche nach vielversprechenden Peers für eine konkrete Anfrage innerhalb des Verbundes. Wir greifen dabei auf existierende Methoden zurück and passen diese an unseren Systemkontext an. Wir pr?sentieren Experimente auf realen Daten, die verschiedene dieser Ans?tze vergleichen. Diese Experimente zeigen, dass die Qualit?t der Ans?tze variiert und untermauern damit die Wichtigkeit und den Einfluss einer leistungsstarken Methode zur Auswahl guter Datenbanken. Unsere Experimente deuten an, dass eine geringe Anzahl sorgf?ltig ausgew?hlter Datenbanken typischerweise bereits einen Gro?teil aller relevanten Ergebnisse des Gesamtsystems liefert.

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This paper presents the MINERVA project that protoypes a distributed search engine based on P2P techniques. MINERVA is layered on top of a Chord-style overlay network and uses a powerful crawling, indexing, and search engine on every autonomous peer. We formalize our system model and identify the problem of efficiently selecting promising peers for a query as a pivotal issue. We revisit existing approaches to the database selection problem and adapt them to our system environment. Measurements are performed to compare different selection strategies using real-world data. The experiments show significant performance differences between the strategies and prove the importance of a judicious peer selection strategy. The experiments also present first evidence that a small number of carefully selected peers already provide the vast majority of all relevant results.

CR Subject Classification H.4,H.3.3,H3.4  相似文献   

二次插值对称点算法求解一维搜索问题     

杨爽  贾礼平 《乐山师范学院学报》2013,(12):3-5,9

插值法是一类用插值多项式来逼近未知或复杂函数的方法。本文基于二次插值,将插值多项式的极小点和其对称点作为搜索区间的两个探索点,通过不断缩小搜索区间,求解一维搜索问题的最优解。本文给出了二次插值对称点的算法,并用0.618法进行了数值比较。结果表明,新算法比0.618法效果好。  相似文献   

Search tactics used in solving everyday how-to technical tasks: Repertoire,selection and tenacity     

Sophie Rutter  Verena Blinzler  Chaoyu Ye  Max L. Wilson  Michael D. Twidale 《Information processing & management》2019,56(3):919-938

With greater access to computational resources, people use search to address many everyday challenges in their lives, including solving technology problems. Although there are now many useful ‘how-to’ resources online (especially videos on YouTube), it can still be difficult to identify, understand, and resolve certain kinds of technical problem. While research tasks have been studied for many years and we know the tactics people use, we know far less about searchers’ tactics for how-to technical tasks that involve actually being able to apply found information to resolve a problem. Crucial to our study was developing and studying a highly realistic, how-to technical task, for which there was no single guidance resource: making a phone safe for a child. After providing 39 participants with an actual phone to fix, and a search engine to perform the task, we analysed their search tactics using retrospective cued think aloud interviews. Our primary contribution is a set of 77 tactics used, in three categories, along with detail of how common they were. We conclude that people had a lot of tactics in their repertoire. Although it was not hard for participants to find relevant information, what was hard was for participants to find information they could use; indeed only 23% of participants successfully completed the entire task. Domain knowledge affected the choice of tactics used (although not necessarily towards better task success). We discuss these influences and make design recommendations for how future search systems can support those in resolving how-to technical tasks.  相似文献   

Information retrieval in the workplace: A comparison of professional search practices     

Tony Russell-Rose  Jon Chamberlain  Leif Azzopardi 《Information processing & management》2018,54(6):1042-1057

Legal researchers, recruitment professionals, healthcare information professionals, and patent analysts all undertake work tasks where search forms a core part of their duties. In these instances, the search task is often complex and time-consuming and requires specialist expertise to identify relevant documents and insights within large domain-specific repositories and collections. Several studies have been made investigating the search practices of professionals such as these, but few have attempted to directly compare their professional practices and so it remains unclear to what extent insights and approaches from one domain can be applied to another. In this paper we describe the results of a survey of a purposive sample of 108 legal researchers, 64 recruitment professionals and 107 healthcare information professionals. Their responses are compared with results from a previous survey of 81 patent analysts. The survey investigated their search practices and preferences, the types of functionality they value, and their requirements for future information retrieval systems. The results reveal that these professions share many fundamental needs and face similar challenges. In particular a continuing preference to formulate queries as Boolean expressions, the need to manage, organise and re-use search strategies and results and an ambivalence toward the use of relevance ranking. The results stress the importance of recall and coverage for the healthcare and patent professionals, while precision and recency were more important to the legal and recruitment professionals. The results also highlight the need to ensure that search systems give confidence to the professional searcher and so trust, explainability and accountability remains a significant challenge when developing such systems. The findings suggest that translational research between the different areas could benefit professionals across domains.  相似文献   

A knowledge-based semantic framework for query expansion     

Jamal Abdul Nasir  Iraklis Varlamis  Samreen Ishfaq 《Information processing & management》2019,56(5):1605-1617

Searching for relevant material that satisfies the information need of a user, within a large document collection is a critical activity for web search engines. Query Expansion techniques are widely used by search engines for the disambiguation of user’s information need and for improving the information retrieval (IR) performance. Knowledge-based, corpus-based and relevance feedback, are the main QE techniques, that employ different approaches for expanding the user query with synonyms of the search terms (word synonymy) in order to bring more relevant documents and for filtering documents that contain search terms but with a different meaning (also known as word polysemy problem) than the user intended. This work, surveys existing query expansion techniques, highlights their strengths and limitations and introduces a new method that combines the power of knowledge-based or corpus-based techniques with that of relevance feedback. Experimental evaluation on three information retrieval benchmark datasets shows that the application of knowledge or corpus-based query expansion techniques on the results of the relevance feedback step improves the information retrieval performance, with knowledge-based techniques providing significantly better results than their simple relevance feedback alternatives in all sets.  相似文献   

IT环境下文献检索课的发展     

郑宏 《辽宁科技学院学报》2003,5(1):60-62

阐述了在IT环境下，文检课在由传统的手工检索逐步向计算机检索过渡中，文检课如何发展。  相似文献   

"中南"一词的翻译——基于网络语料的调查     

贺文照 《温州职业技术学院学报》2007,7(2):59-62

基于网络语料的调查来证实作者对“中南”英译对应词的猜想。通过搜索引擎,调查了国内网络上“中南”一词的英译情况,同时选取了比较权威的英、美、澳等国的网站语料进行检索,结果验证了“south central”和“central south”的可接受性。虽然没有完全排除“central south”在一定范围内的使用事实,但是,从检索到的语料来看,“south central”的用法优于“central south”。  相似文献   

试论张元济对古籍整理的贡献     

郝永伟 《南昌教育学院学报》2007,22(3):58-61

张元济是现代出版业之父。本文试以搜访和求购丰赡的善本书资源、精校精勘的为人作嫁襟怀、坚实的出版步履三个方面为切入点,以张元济对古籍的整理为视角,探讨张元济对古籍整理的贡献。在出版产业化的今天,研究张元济对古籍整理的贡献有一定的现实意义。  相似文献   

选择与吸纳：“寻根文学”对民族文化记忆的唤醒     

陈灵强 《台州学院学报》2008,30(1):36-40

在全球化的语境中,民族文化记忆的本土反弹是其必然趋势。寻根文学从民族神话中找到了野性思维的优势,将它激活并运用到自己的创作中,构建起一个有着现代特色的原始空间;致力于把地域文化重新发掘出来,使“寻根”作品沾染上鲜明的地域文化色彩;借鉴传统审美经验,其作品展现了汉语言的活力和灵性。  相似文献