Search (35 results, page 2 of 2)

  • × theme_ss:"Datenfernübertragung"
  1. SRW/U erleichtert verteilte Datenbankrecherchen (2005) 0.01 
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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."
    Object
    SRW/U
  2. Joy, F.; Murray, R.: ¬The World-Wide Web and Z39.50 : which way for libraries? (1995) 0.01 
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  3. Ball, R.; Peters, M.: Datennetze in einem Forschungszentrum : Das INTRANET der Zentralbibliothek des Forschungszentrums Jülich (1998) 0.01 
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  4. Seiler, R.; Jung, K.: Dicke Bilder durch dünne Leitungen : Konzepte und Algorithmen der Bilddatenkompression (2000) 0.01 
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  5. Wüst, R.: ¬Eine Einführung in der Z39.50 : ein neuer Standard und seine Bedeutung für Bibliotheken (1994) 0.01 
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  6. Petry, W.: Datenreisen billiger : wie man Telekommunikationskosten sparen kann (1994) 0.01 
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    Source
    Cogito. 10(1994) H.4, S.17-22
  7. Pospischil, R.: ¬A bypass for the local loop : Deutsche Telekom's strategy for fiber to the home (1995) 0.01 
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  8. Maier-Rabler, U.: Austrian information highway initiatives in the stage of disillusionment (1996) 0.01 
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  9. Pordesch, U.; Roßnagel, A.: "Offene" Kommunikation : zur Verletzlichkeit des Internet und zur Notwendigkeit neuer Sicherheits- und Schutzstrategien in den virtuellen Welten (1997) 0.01 
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  10. Scheuerer, J.: Onlinebanking (1997) 0.01 
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    Source
    Com!. 1997, H.8, S.22-24
  11. Berezak-Lazarus, N.: ADSL - Auf der Überholspur durch die Multimedia-Welt (1999) 0.01 
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    Footnote
    Rez. in: Internet Professionell 2000, H.2, S.22
  12. Cerf, V.G.: Netztechnik (1995) 0.01 
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    Pages
    S.22-31
  13. Lexikon der Datenkommunikation : [traditionelle Techniken: Ethernet, Token Ring; Highspeed Networking: Gigabit Ethernet, ATM, LAN-Switching; Trends: Virtual LAN, VPN, xDSL-Techniken] (1999) 0.00 
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    Abstract
    Ob Newcomer oder Experte: für den DV-Profi, der bei zunehmender Spezialisierung nicht den Überblick verlieren will, ist dieses Buch zu ein nützliches und wertvollens Nachschlagewerk bei der täglichen Arbeit. Ausführliche und detailgenau Begriffserklärungen finden sich u. a. zu folgenden zentralen Themen der Datenkommunikation: - die klassischen Netze: Ethernet, Token Ring, FDD - Highspeed Networking: Fast Ethernet, 100 VGAnyLAN, Frame Relay, Segment Switching, Asynchronous Transfer Mode (ATM) - Internetworking, Virtual LANs - Online-Dienste - Internet, Intranet
  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
  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

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