Search (3 results, page 1 of 1)

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Classification

Bib A 291 / Gesamtkatalog Deutschland
Bib A 291 Gesamtkatalog

SBB

Bib A 291 / Gesamtkatalog Deutschland
Bib A 291 Gesamtkatalog

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Abstract

Many information professionals working in small units today fail to find the published tools for subject-based organization that are appropriate to their local needs, whether they are archivists, special librarians, information officers, or knowledge or content managers. Large established standards for document description and organization are too unwieldy, unnecessarily detailed, or too expensive to install and maintain. In other cases the available systems are insufficient for a specialist environment, or don't bring things together in a helpful way. A purpose built, in-house system would seem to be the answer, but too often the skills necessary to create one are lacking. This practical text examines the criteria relevant to the selection of a subject-management system, describes the characteristics of some common types of subject tool, and takes the novice step by step through the process of creating a system for a specialist environment. The methodology employed is a standard technique for the building of a thesaurus that incidentally creates a compatible classification or taxonomy, both of which may be used in a variety of ways for document or information management. Key areas covered are: What is a thesaurus? Tools for subject access and retrieval; what a thesaurus is used for? Why use a thesaurus? Examples of thesauri; the structure of a thesaurus; thesaural relationships; practical thesaurus construction; the vocabulary of the thesaurus; building the systematic structure; conversion to alphabetic format; forms of entry in the thesaurus; maintaining the thesaurus; thesaurus software; and; the wider environment. Essential for the practising information professional, this guide is also valuable for students of library and information science.

Footnote

In den stärker ins Detail gehenden Kapiteln weist Broughton zunächst auf die Bedeutung des systematischen Teils eines Thesaurus neben dem alphabetischen Teil hin und erläutert dann die Elemente des letzteren, wobei neben den gängigen Thesaurusrelationen auch die Option der Ausstattung der Einträge mit Notationen eines Klassifikationssystems erwähnt wird. Die Thesaurusrelationen selbst werden später noch in einem weiteren Kapitel ausführlicher diskutiert, wobei etwa auch die polyhierarchische Beziehung thematisiert wird. Zwei Kapitel zur Vokabularkontrolle führen in Aspekte wie Behandlung von Synonymen, Vermeidung von Mehrdeutigkeit, Wahl der bevorzugten Terme sowie die Formen von Thesauruseinträgen ein (grammatische Form, Schreibweise, Zeichenvorrat, Singular/Plural, Komposita bzw. deren Zerlegung usw.). Insgesamt acht Kapitel - in der Abfolge mit den bisher erwähnten Abschnitten didaktisch geschickt vermischt - stehen unter dem Motto "Building a thesaurus". Kurz zusammengefasst, geht es dabei um folgende Tätigkeiten und Prozesse: - Sammlung des Vokabulars unter Nutzung entsprechender Quellen; - Termextraktion aus den Titeln von Dokumenten und Probleme hiebei; - Analyse des Vokabulars (Facettenmethode); - Einbau einer internen Struktur (Facetten und Sub-Facetten, Anordnung der Terme); - Erstellung einer hierarchischen Struktur und deren Repräsentation; - Zusammengesetzte Themen bzw. Begriffe (Facettenanordnung: filing order vs. citation order); - Konvertierung der taxonomischen Anordnung in ein alphabetisches Format (Auswahl der Vorzugsbegriffe, Identifizieren hierarchischer Beziehungen, verwandter Begriffe usw.); - Erzeugen der endgültigen Thesaurus-Einträge.
Weitere Rez. in: New Library World 108(2007) nos.3/4, S.190-191 (K.V. Trickey): "Vanda has provided a very useful work that will enable any reader who is prepared to follow her instruction to produce a thesaurus that will be a quality language-based subject access tool that will make the task of information retrieval easier and more effective. Once again I express my gratitude to Vanda for producing another excellent book." - Electronic Library 24(2006) no.6, S.866-867 (A.G. Smith): "Essential thesaurus construction is an ideal instructional text, with clear bullet point summaries at the ends of sections, and relevant and up to date references, putting thesauri in context with the general theory of information retrieval. But it will also be a valuable reference for any information professional developing or using a controlled vocabulary." - KO 33(2006) no.4, S.215-216 (M.P. Satija)

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Content

Inhalt: Chapter 1. Introduction to Web Search Engines: 1.1 A Short History of Information Retrieval - 1.2 An Overview of Traditional Information Retrieval - 1.3 Web Information Retrieval Chapter 2. Crawling, Indexing, and Query Processing: 2.1 Crawling - 2.2 The Content Index - 2.3 Query Processing Chapter 3. Ranking Webpages by Popularity: 3.1 The Scene in 1998 - 3.2 Two Theses - 3.3 Query-Independence Chapter 4. The Mathematics of Google's PageRank: 4.1 The Original Summation Formula for PageRank - 4.2 Matrix Representation of the Summation Equations - 4.3 Problems with the Iterative Process - 4.4 A Little Markov Chain Theory - 4.5 Early Adjustments to the Basic Model - 4.6 Computation of the PageRank Vector - 4.7 Theorem and Proof for Spectrum of the Google Matrix Chapter 5. Parameters in the PageRank Model: 5.1 The a Factor - 5.2 The Hyperlink Matrix H - 5.3 The Teleportation Matrix E Chapter 6. The Sensitivity of PageRank; 6.1 Sensitivity with respect to alpha - 6.2 Sensitivity with respect to H - 6.3 Sensitivity with respect to vT - 6.4 Other Analyses of Sensitivity - 6.5 Sensitivity Theorems and Proofs Chapter 7. The PageRank Problem as a Linear System: 7.1 Properties of (I - alphaS) - 7.2 Properties of (I - alphaH) - 7.3 Proof of the PageRank Sparse Linear System Chapter 8. Issues in Large-Scale Implementation of PageRank: 8.1 Storage Issues - 8.2 Convergence Criterion - 8.3 Accuracy - 8.4 Dangling Nodes - 8.5 Back Button Modeling