Search (11 results, page 1 of 1)

0.009228187 = product of:
  0.018456373 = sum of:
    0.018456373 = product of:
      0.036912747 = sum of:
        0.036912747 = weight(_text_:22 in 1781) [ClassicSimilarity], result of:
          0.036912747 = score(doc=1781,freq=2.0), product of:
            0.15901025 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04540776 = queryNorm
            0.23214069 = fieldWeight in 1781, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.046875 = fieldNorm(doc=1781)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Date

22. 3.2008 14:35:21

0.0076901563 = product of:
  0.015380313 = sum of:
    0.015380313 = product of:
      0.030760625 = sum of:
        0.030760625 = weight(_text_:22 in 1397) [ClassicSimilarity], result of:
          0.030760625 = score(doc=1397,freq=2.0), product of:
            0.15901025 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04540776 = queryNorm
            0.19345059 = fieldWeight in 1397, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.0390625 = fieldNorm(doc=1397)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Date

22. 3.2008 14:29:25

0.0076901563 = product of:
  0.015380313 = sum of:
    0.015380313 = product of:
      0.030760625 = sum of:
        0.030760625 = weight(_text_:22 in 1708) [ClassicSimilarity], result of:
          0.030760625 = score(doc=1708,freq=2.0), product of:
            0.15901025 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04540776 = queryNorm
            0.19345059 = fieldWeight in 1708, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.0390625 = fieldNorm(doc=1708)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Date

22. 3.2008 16:15:37

0.0074754483 = product of:
  0.014950897 = sum of:
    0.014950897 = product of:
      0.029901793 = sum of:
        0.029901793 = weight(_text_:1998 in 1486) [ClassicSimilarity], result of:
          0.029901793 = score(doc=1486,freq=2.0), product of:
            0.17527951 = queryWeight, product of:
              3.8601224 = idf(docFreq=2531, maxDocs=44218)
              0.04540776 = queryNorm
            0.17059492 = fieldWeight in 1486, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.8601224 = idf(docFreq=2531, maxDocs=44218)
              0.03125 = fieldNorm(doc=1486)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Abstract

Interested in how an efficient search engine works? Want to know what algorithms are used to rank resulting documents in response to user requests? The authors answer these and other key information on retrieval design and implementation questions is provided. This book is not yet another high level text. Instead, algorithms are thoroughly described, making this book ideally suited for both computer science students and practitioners who work on search-related applications. As stated in the foreword, this book provides a current, broad, and detailed overview of the field and is the only one that does so. Examples are used throughout to illustrate the algorithms. The authors explain how a query is ranked against a document collection using either a single or a combination of retrieval strategies, and how an assortment of utilities are integrated into the query processing scheme to improve these rankings. Methods for building and compressing text indexes, querying and retrieving documents in multiple languages, and using parallel or distributed processing to expedite the search are likewise described. This edition is a major expansion of the one published in 1998. Neuaufl. 2005: Besides updating the entire book with current techniques, it includes new sections on language models, cross-language information retrieval, peer-to-peer processing, XML search, mediators, and duplicate document detection.

0.006659871 = product of:
  0.013319742 = sum of:
    0.013319742 = product of:
      0.026639484 = sum of:
        0.026639484 = weight(_text_:22 in 150) [ClassicSimilarity], result of:
          0.026639484 = score(doc=150,freq=6.0), product of:
            0.15901025 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04540776 = queryNorm
            0.16753313 = fieldWeight in 150, product of:
              2.4494898 = tf(freq=6.0), with freq of:
                6.0 = termFreq=6.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.01953125 = fieldNorm(doc=150)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Classification

006.7 22

Date

7. 3.2007 19:30:22

DDC

006.7 22

0.006152125 = product of:
  0.01230425 = sum of:
    0.01230425 = product of:
      0.0246085 = sum of:
        0.0246085 = weight(_text_:22 in 2249) [ClassicSimilarity], result of:
          0.0246085 = score(doc=2249,freq=2.0), product of:
            0.15901025 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04540776 = queryNorm
            0.15476047 = fieldWeight in 2249, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.03125 = fieldNorm(doc=2249)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Date

22. 3.2008 18:05:16

0.006152125 = product of:
  0.01230425 = sum of:
    0.01230425 = product of:
      0.0246085 = sum of:
        0.0246085 = weight(_text_:22 in 2426) [ClassicSimilarity], result of:
          0.0246085 = score(doc=2426,freq=2.0), product of:
            0.15901025 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04540776 = queryNorm
            0.15476047 = fieldWeight in 2426, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.03125 = fieldNorm(doc=2426)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

0.006152125 = product of:
  0.01230425 = sum of:
    0.01230425 = product of:
      0.0246085 = sum of:
        0.0246085 = weight(_text_:22 in 2428) [ClassicSimilarity], result of:
          0.0246085 = score(doc=2428,freq=2.0), product of:
            0.15901025 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04540776 = queryNorm
            0.15476047 = fieldWeight in 2428, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.03125 = fieldNorm(doc=2428)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

0.005606586 = product of:
  0.011213172 = sum of:
    0.011213172 = product of:
      0.022426344 = sum of:
        0.022426344 = weight(_text_:1998 in 6) [ClassicSimilarity], result of:
          0.022426344 = score(doc=6,freq=2.0), product of:
            0.17527951 = queryWeight, product of:
              3.8601224 = idf(docFreq=2531, maxDocs=44218)
              0.04540776 = queryNorm
            0.12794618 = fieldWeight in 6, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.8601224 = idf(docFreq=2531, maxDocs=44218)
              0.0234375 = fieldNorm(doc=6)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

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

0.0037377242 = product of:
  0.0074754483 = sum of:
    0.0074754483 = product of:
      0.014950897 = sum of:
        0.014950897 = weight(_text_:1998 in 1796) [ClassicSimilarity], result of:
          0.014950897 = score(doc=1796,freq=2.0), product of:
            0.17527951 = queryWeight, product of:
              3.8601224 = idf(docFreq=2531, maxDocs=44218)
              0.04540776 = queryNorm
            0.08529746 = fieldWeight in 1796, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.8601224 = idf(docFreq=2531, maxDocs=44218)
              0.015625 = fieldNorm(doc=1796)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Footnote

Rez. in: JASIST 55(2004) no.11, S.1025-1026 (D.E. Agosto): ""Did you ever feel as though the Internet has caused you to lose control of your library?" So begins the introduction to this volume of over 50 articles, essays, library policies, and other documents from a variety of sources, most of which are library journals aimed at practitioners. Volume editor Block has a long history of library service as well as an active career as an online journalist. From 1977 to 1999 she was the Associate Director of Public Services at the St. Ambrose University library in Davenport, Iowa. She was also a Fox News Online weekly columnist from 1998 to 2000. She currently writes for and publishes the weekly ezine Exlibris, which focuses an the use of computers, the Internet, and digital databases to improve library services. Despite the promising premise of this book, the final product is largely a disappointment because of the superficial coverage of its issues. A listing of the most frequently represented sources serves to express the general level and style of the entries: nine articles are reprinted from Computers in Libraries, five from Library Journal, four from Library Journal NetConnect, four from ExLibris, four from American Libraries, three from College & Research Libraries News, two from Online, and two from The Chronicle of Higher Education. Most of the authors included contributed only one item, although Roy Tennant (manager of the California Digital Library) authored three of the pieces, and Janet L. Balas (library information systems specialist at the Monroeville Public Library in Pennsylvania) and Karen G. Schneider (coordinator of lii.org, the Librarians' Index to the Internet) each wrote two. Volume editor Block herself wrote six of the entries, most of which have been reprinted from ExLibris. Reading the volume is muck like reading an issue of one of these journals-a pleasant experience that discusses issues in the field without presenting much research. Net Effects doesn't offer much in the way of theory or research, but then again it doesn't claim to. Instead, it claims to be an "idea book" (p. 5) with practical solutions to Internet-generated library problems. While the idea is a good one, little of the material is revolutionary or surprising (or even very creative), and most of the solutions offered will already be familiar to most of the book's intended audience.

0.0030760625 = product of:
  0.006152125 = sum of:
    0.006152125 = product of:
      0.01230425 = sum of:
        0.01230425 = weight(_text_:22 in 1789) [ClassicSimilarity], result of:
          0.01230425 = score(doc=1789,freq=2.0), product of:
            0.15901025 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04540776 = queryNorm
            0.07738023 = fieldWeight in 1789, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.015625 = fieldNorm(doc=1789)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Date

23. 3.2008 19:10:22