Search (47 results, page 1 of 3)

  • × theme_ss:"Datenfernübertragung"
  1. SRW/U erleichtert verteilte Datenbankrecherchen (2005) 0.02 
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    Content
    "Seit zwei Jahrzehnten nutzen vor allem Bibliotheksverbünde das Protokoll Z39.50, um ihren Benutzern im Internet die simultane Abfrage mehrerer Datenbanken zu ermöglichen. Jetzt gibt es einen Nachfolger dieses Protokolls, der eine einfachere Implementierung verspricht. Damit ist auch eine größere Verbreitung für die Suche in verteilten Datenbeständen anderer Institutionen, wie z.B. Archiven und Museen, wahrscheinlich. SRW/U (Search and Retrieve Web Service bzw. Search and Retrieve URL Service, www.loc.90v/z3950/agency/zing/srw) wurde von einer an der Library of Congress angesiedelten Initiative entwickelt und beruht auf etablierten Standards wie URI und XML. Die mit SRW und SRU möglichen Abfragen und Ergebnisse unterscheiden sich nur in der Art der Übertragung, verwenden aber beide dieselben Prozeduren. Davon gibt es nur drei: explain, scan und searchRetrieve. Die beiden Erstgenannten dienen dazu, allgemeine Informationen über den Datenanbieter bzw. die verfügbaren Indexe zubekommen. Das Herzstück ist die search-Retrieve-Anweisung. Damit werden Anfragen direkt an die Datenbank gesendet und die Parameter des Suchergebnisses definiert. Verwendet wird dafür die Retrievalsprache CQL (Common Query Language), die simple Freitextsuchen, aber auch mit Boolschen Operatoren verknüpfte Recherchen ermöglicht. Bei SRU werden die Suchbefehle mittels einfacher HTTP GET -Anfragen übermittelt, die Ergebnisse in XML zurückgeliefert. Zur Strukturierung der Daten dienen z.B. Dublin Core, MARC oder EAD. Welches Format von der jeweiligen Datenbank bereitgestellt wird, kann durch die explain-Anweisung ermittelt gebracht werden."
    Source
    Information - Wissenschaft und Praxis. 56(2005) H.5/6, S.274
  2. Millsap, L.; Ferl, T.E.: Search patterns of remote users : an analysis of OPAC transaction logs (1993) 0.01 
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    Abstract
    The focus of this study is the search behavior of remote users of the University of California MELVYL Library System, an OPAC. Transaction logs from randomly selected remote user search sessions are analyzed. Descriptive data on the number and type of searches, choice of search mode and database, number of retrievals, number and type of errors, and use of system HELP facilities are presented. The search data have been cross-tabulated with demographic data on the same group of remote users, collected through an online survey conducted by the authors. Effectiveness of system usage is discussed. A case mode is made for the desirability of additional heuristics in the catalog portion of the system
    Source
    Information technology and libraries. 12(1993) no.3, S.321-343
  3. Moen, W.: Information retrieval protocols : Z39.50 and Search & Retrieve via URL (2009) 0.01 
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    Abstract
    Information retrieval (IR) protocols support effective and interoperable intersystem search and retrieval. Although intersystem search methods have been envisioned and under development since the 1970s, it was the Z39.50 IR protocol, first released in 1988, that demonstrated real-world possibilities for such search and retrieval. As the networked information environment changed with the emergence of the World Wide Web, the need for standard IR protocols did not disappear, and one can argue the need is even more compelling given both the visible and invisible Web. A new protocol, based on the experience from Z39.50 but simpler and more comprehensible than Z39.50, is now being used for Web search and retrieval. Search and retrieve via URL (SRU) uses Web technologies and standards resulting in a Web friendly protocol that provides standard search access to existing Z39.50 resources and a wide-range of new non-catalog digital resources. This entry provides both an overview of the two protocols and technical details to understand both. A brief discussion of IR and communications protocols provides background to the specifics of these two IR protocols. Although communication protocols are by their nature technical specifications, this entry focuses on an overview of the functions and capabilities of the protocols. It uses technical concepts and terminology from the protocols to help explain how the protocols work but limits discussion of technical details.
    Source
    Encyclopedia of library and information sciences. 3rd ed. Ed.: M.J. Bates
  4. Ferl, T.E.; Millsap, L.: Remote use of the University of California MELVYL Library System : an online survey (1992) 0.01 
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    Abstract
    This report presents the results of a survey of users who access the University of California's online union catalog, the MELVYL library system, via microcomputers with modems or connections carried through local or wide area networks. The report includes descriptive statistics on user location, status, subject interest, affiliation, in-library versus out-of-library usage patterns, need for assistance, and desire for new features
    Source
    Information technology and libraries. 11(1992) no.3, S.285-303
  5. Low, K.: ABCs of OPACs (1994) 0.01 
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    Abstract
    Looks at the services offered by academic OPACs. Describes the services provided by Harvard Online Library Information System, University of California MELVYL Catalog, Stanford University' SOCRATES, and Princeton University Library. Many libraries now offer dial-up and/or Internet access to their OPACs
  6. Corey, J.F.: ¬A grant for Z39.50 (1994) 0.01 
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    Abstract
    In Sept. 1990, the US Dept. of Education's Library Technology and Cooperation Grants Program awarded a three-year grant to the Florida Center for Library Automation (FCLA), an agency of the Florida State University System, to develop software adhering to the ANSI Z39.50 Information Retrieval protocol standard. The Z39.50 software was to operate over the OSI communications protocols and be integrated with FCLA's NOTIS system, which is shared by all 9 state universities in Florida. In order to test the correctness of its Z39.50 software, FCLA sought out other library software developers who would be willing to develop Z39.50 systems of their own. As part of this process, FCLA helped to found the Z39.50 Implementor's Group (ZIG), which has since gone on to improve the standard and promote Z39.50 implementations throughout much of the North American library systems marketplace. Early on in the project, it became apparent that TCP/IP would be a more heavily used communication vehicle for Z39.50 messages than OSI. FCLA expanded its design to include TCP/IP and, by the end of the grant in Sept. 1993, will have a working Z39.50 system that can communicate over both OSI and TCP/IP networks
  7. Hinnebusch, M.: Z39.50 at ten years : how stands the standard? (1997) 0.01 
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    Abstract
    The ANSI Z39.50 standard was adopted 10 years ago. It outlines a set of rules and procedures to allow a computer system to search the databases provided by another system and to retrieve the results of that search. Traces its development adoption in library automation product lines. Recent major developments have been the migration to version 3 and the adoption of community profiles. Community profiles are documents that describe agreements that a community of interest develops to ensure clients and servers can interpret in specific ways. Describes the Government Information Locators Service, WAIS, ATS, ZDSR, Cataloguing, CEOS CIP, Digital Collection, Digital Library Objects and Museum Profiles
  8. Snelson, P.: Relationships between access and use in information systems : remote access to and browsing of online catalogues (1993) 0.01 
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    Abstract
    Examined two groups of online catalogue users segregated by their method of access to the system: terminals in the library or remote workstations. An online survey collected demographic data, perceptions on source and terminal accessibility, and information on usage, task variety and search satisfaction. Transaction logs furnished data on browsing behavious, while interviews of both groups provided additional information about remote use. Results indicate that remote use is comparable to traditional use
    Imprint
    Medford, NJ : Learned Information
    Source
    Integrating technologies - converging professions: proceedings of the 56th Annual Meeting of the American Society for Information Science, Columbus, OH, 24-28 October 1993. Ed.: S. Bonzi
  9. Kalin, S.W.: ¬The searching behavior of remote users : a study of one online public access catalog (OPAC) (1991) 0.01 
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    Abstract
    This study aimed to determine if the searching behaviour of remote users of LIAS, Penn State's online catalogue differed from those using the OPAC within the library. More than 1.000 searches done by remote users (those accessing the system via either dial-access or the university's computer network) were compared to more than 1.000 searches done by in-house users. Each search was duplicated step by step and analysed according to a pre-determined set of criteria. Although few dramatic differences were found between the 2 groups, there were enough subtle differences to generate interest. In general, remote users are the more sophisticated searchers, bearing out the assumption that remote users seem to have a better conceptual knowledge of how an information system should operate. On the other hand, they struggle more with the procedural details of how to use the OPAC. Dial-access users seem to constitute a unique group of users: their searches are often quite different than those done by either network or in-house users
    Imprint
    Medford : Learned Information Inc.
  10. Joy, F.; Murray, R.: ¬The World-Wide Web and Z39.50 : which way for libraries? (1995) 0.01 
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    Abstract
    The function of the W3, like that of Z39.50, is to offer access to networked information, and they appear to have similar client/server architectures. However, libraries need both because of the W3's lack of support for the advanced search, retrieval and management facilities that are expected of modern OPACs and are offered by Z39.50. Current research is involved in developing hybrid W3/Z39.50 services
  11. Boßmeyer, C.: OSI-Anwendungen in Bibliotheken oder Was ein Bibliothekar von OSI wissen sollte (1995) 0.01 
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    Abstract
    Open System Interconnection (OSI) Standard 7498 appeared in 1984. Open systems of PCs and workstations decentralize information processing and divide it between several computers, based on the client-server concept. Relevant terminology is explained, including application protocol, bases of the SR/Z39.50 model, data transmission, search request services, query types, attribute sets, transmission format, transfer syntax, solution models and cooperation between library systems
  12. Hinich, M.J.; Molyneux, R.E.: Predicting information flows in network traffic (2003) 0.00 
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    Abstract
    Hinich and Molyneux review the literature of internet measurement and note three results consistently to be found in network traffic studies. These are "self-similarity," "long-range dependence," by which is meant that events in one time are correlated with events in a previous time and remain so through longer time periods than expected, and "heavy tails" by which they mean many small connections with low byte counts and a few long connections with large byte counts. The literature also suggests that conventional time series analysis is not helpful for network analysis. Using a single day's traffic at the Berkeley National Labs web server, cumulated TCP flows were collected, log transforms were used with the adding of .01 to all values allowing log transforms of the zero values, and providing a distribution that overcomes the heavy tail problem. However, Hinich's bicorrelation test for nonlinearity using overlapping moving windows found strong evidence of nonlinear structures. Time series analysis assumes linear systems theory and thus additivity and scalability. Spectral analysis should provide large peaks at the lowest frequencies if long range dependence is present since the power spectrum would go to infinity if the frequency goes to zero. This does not occur and so long range dependence must be questioned, at least until it is determined what effect other OSI layers may have on the TCP data.
    Source
    Journal of the American Society for Information Science and technology. 54(2003) no.2, S.161-168
  13. Poo, G.-S.; Chai, B.-P.: Modularity versus efficiency in OSI system implementations (1997) 0.00 
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    Abstract
    Examines a number of possible OSI system implementation strategies based on the various prevailing system facilities: processes, threads, kernel and front-end processors. Analyzes the pros and cons of the strategies showing their relative merits in implementation. The analysis leads to the recommendation of an enhanced subsystem architecture that holds the best compromise of the conflicting requirements of modularity and efficiency
  14. Sloan, B.G.: Remote access : design implications for the online catalog (1991) 0.00 
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    Date
    8. 1.2007 17:22:42
    Footnote
    Simultaneously published as Enhancing Access to Information: Designing Catalogs for the 21st Century
  15. Lazinger, S.S.; Peritz, B.C.: Reader use of a nationwide research library network : local OPAC vs. remote files (1991) 0.00 
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    Date
    22. 2.1999 13:06:18
    Source
    Information technology and libraries. 10(1991), S.192-200
  16. Maio, A.; Littlefield, W.: Issues in mounting a commercial database on an online catalog (1992) 0.00 
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    Abstract
    Hartford University mounted a DRA Atlas Integrated library system in 1991, using a DECnet/Ethernet network and a VAX 6310 mainframe computer. As VAX VT320 terminals were available in many campus buildings, the library's catalogue could be searched from many locations and could be dialed up by remote users. Commercial databases in MARC format could be mounted on the system and searched with the same commands that users employed for the OPAC. Explains the use of Periodical Abstracts from UMI on the online catalogue. Discusses searching strategies and compares the Periodical Abstracts Ondisc CD-ROM with the tape loaded product
  17. Petry, W.; Werner, H.-J.: Anwendertraum: Kommunikations- und Retrieval-Software im Vergleich (1993) 0.00 
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    Source
    Cogito. 9(1993) H.2, S.18-22
  18. Petry, W.: Datenreisen billiger : wie man Telekommunikationskosten sparen kann (1994) 0.00 
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    Source
    Cogito. 10(1994) H.4, S.17-22
  19. Matthews, J.R.; Parker, M.R.: Local Area Networks and Wide Area Networks for libraries (1995) 0.00 
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    Date
    30.11.1995 20:53:22
  20. Lucas, T.A.: Time patterns in remote OPAC use (1993) 0.00 
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    Abstract
    Expanded hours of access and the reduction of peak system loads are often cited as advantages of remote access to OPACs. This argument is based on the assumption that remote users search OPACs when libraries are closed or when there is low internal use. The study tested this assumption by performing a transactional log analysis of the remote and internal use of the OPAC at the Research Libraries of the New York Public Library. Analysis showed that pateerns of remote and internal use differed greatly. A large part of the remote searching occured when the Research Libraries were closed. Compared to internal searching, remote searching was distributed more evenly over the course of the day and the week. Results show that remote access expands the hours of use of the Online catalogue and has potential to reduce peak system loads at the Research Libraries

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