Search (26 results, page 1 of 2)

  • × theme_ss:"Datenfernübertragung"
  1. Moen, W.: Information retrieval protocols : Z39.50 and Search & Retrieve via URL (2009) 0.08 
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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.
  2. Joy, F.; Murray, R.: ¬The World-Wide Web and Z39.50 : which way for libraries? (1995) 0.05 
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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
  3. SRW/U erleichtert verteilte Datenbankrecherchen (2005) 0.04 
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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."
  4. Lazinger, S.S.; Peritz, B.C.: Reader use of a nationwide research library network : local OPAC vs. remote files (1991) 0.03 
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    Abstract
    The primary objective of the present study was to exmine whether readers conducting bibliographic searches in ALEPH - Israel's research library network - tend to search only within the OPAC of the library within which they are working or whether they access the remote OPACs of other libraries. The ALEPH network has a dezentralized database. Therefore, it was possible to examine this question because each library has its own access code and each database can be searched separately. The data were collected by means of a one-page questionnaire lefr beside each terminal in the library of the Graduate School of Library and Archive Studies of the Hebrew University of Jerusalem during an entire academic years. results of analysis of the data collected in this survey are presented in 6 tables
    Date
    22. 2.1999 13:06:18
  5. Millsap, L.; Ferl, T.E.: Search patterns of remote users : an analysis of OPAC transaction logs (1993) 0.03 
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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
  6. Henry, M.K.; Keenan, L.; Reagan, M.: Search sheets for OPACs on the internet : a selective guide to U.S. OPACs utilizing VT100 emulation (1991) 0.02 
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  7. Hinnebusch, M.: Z39.50 at ten years : how stands the standard? (1997) 0.02 
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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. Petry, W.; Werner, H.-J.: Anwendertraum: Kommunikations- und Retrieval-Software im Vergleich (1993) 0.01 
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    Source
    Cogito. 9(1993) H.2, S.18-22
  9. Gottswinter, E.; Mönnich, M.W.: Brücken bauen zwischen EDV-Systemen : Einführung in die SR-Normen (1994) 0.01 
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    Abstract
    Explains the basic principles of the ISO Search and Retrieve (SR) standard which facilitates the searching and retrieval of data from computers via electronic networks regardless of the hardware and software used. Provides an introduction to SR and addresses the parameters of SR servies. Abstract Syntax Notation 1 and the preliminary implementation of an SR Update Service in the KARIN cataloguing system
  10. Ciardhuain, S.O.: Developments in networked bibliographic catalogues (1994) 0.01 
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    Abstract
    Computer and communications technology is having a profound impact on libraries and the way in which they serve their users. Discusses online catalogues in libraries, the development of the Internet and OSI, and the development of search and retrieve (SR) protocols to allow standardized access to library catalogues across communications networks. Considers the deployment of SR protocols, problems with interoperability of clients and servers, interlibrary loan possibilities of SR protocols, and the feasibility of electronic document delivery
  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. 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
  13. Matthews, J.R.; Parker, M.R.: Local Area Networks and Wide Area Networks for libraries (1995) 0.01 
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    Date
    30.11.1995 20:53:22
  14. 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
  15. Bradley, P.: Towards a common user interface (1995) 0.01 
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    Abstract
    Discusses the advantages and disadvantages of a common user interface to enable searching of all databases regardless of producer, supplier or location, such as local CD-ROM, or network. Explains client server architecture, the basic component of a common user interface and outlines current developments including the Z39.50 application layer protocol. A common user interface will result in greater synergy between information providers, technology providers, distributors and information professionals. It will also be able to search across the Internet and make that huge wealth of data much more available than it currently is. Predicts that a common user interface will be in operation by the turn of the century
  16. Scheuerer, J.: Onlinebanking (1997) 0.01 
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    Source
    Com!. 1997, H.8, S.22-24
  17. 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
  18. 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
  19. Lucas, T.A.: Time patterns in remote OPAC use (1993) 0.01 
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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
  20. Harms, T.: Kriegserklärung : Telekom schockiert mit neuem Internet-Tarif die Konkurrenz (2000) 0.01 
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    Content
    "Robert T-Online hat endlich wieder einen spannenden Job. Die Aufgabe, Anleger für den Börsengang der Telekom-Internettochter zu begeistern, hat das virtuelle Reklamemännchen abgehakt. Jetzt wirbt der strohblonde Robert bundesweit auf Plakaten und in Zeitungsanzeigen für ,Sssssuper-Highspeed zum Sssssuperpreis". Gemeint ist der brandneue Internettarif T-Online DSL Flat 49 Mark Pauschale im Monat für unbegrenztes Surfen im World Wide Web ohne zusätzliche Telefongebühren. Und das bei Übertragungsraten von 768 Kilobit pro Sekunde für das Herunterladen und 128 Kilobit pro Sekunde für das Versenden von Daten. Also satte zwölfmal so schnell wie bei einem herkömmlichen ISDN-Anschluss. Für Telekom-Marketingvorstand Detlev Buchal ein schlicht unschlagbares Angebot". Das Kürzel DSL steht für "Digital Subscriber Line", zu deutsch "Digitale Teilnehmer-Leitung". DSL-Technologie ermöglicht die Ubertragung breitbandiger Datendienste auf herkömmlichen Telefon-Kupferkabeln. DSL-Zugänge ins Internet bieten nicht nur einen deutlich rascheren Seitenaufbau, sie leisten vor allem erstmals die Übermittlung von Bild- und Tondateien in befriedigender Qualität auf den PC. Mit DSL kann das strapazierte Schlagwort vom Internet-Fernsehen erstmals Realität werden. Zwar hält der Pink Panther schon seit Sommer 1999 unter dem Produktnamen T-DSV für Geschäfts- und Privatkunden auch einen Online-Hochgeschwindigkeitszug unter Dampf. Doch das Angebot stand nur in einigen Ballungsräumen zur Verfügung, schreckte den gemeinen Web-Nutzer durch allzu hohe Entgelte ab und lockte deshalb bisher nur rund 100 000 Interessenten hinter dem PC hervor. Mit der seit Monatsbeginn gültigen drastischen Preissenkung hat sich der Bonner Multimedia-Riese nicht weniger vorgenommen, als in den nächsten Jahren die breite Masse der bereits über 18 Millionen deutschen Internet-Nutzer in Highspeed-Surfer zu verwandeln.
    Und das auf den Telefonstrippen der Deutschen Telekom, als Kunden des hauseigenen Internet-Dienstes T-Online. Unser Ziel ist ganz klar", verkündet Telekom-Manager Buchal: "Die Deutsche Telekom macht mit T-DSL aus dem Internet das schnelle Internet für jedermann". Um tatsächlich alle Welt mit den Hochgeschwindigkeits-Datennetz beglücken zu können, muss allerdings das Telefonnetz in den nächsten Monaten aufgerüstet werden. Bis Ende des Jahres soll der Web-Turbo bereits in rund 600 Ortsnetzen, bis Ende 2001 für 90 Prozent aller Haushalte zur Verfügung stehen. Ende 2000 wollen Buchal und Kollegen 500 000 DSL-Kunden gewonnen haben. Wichtigster Telekom-Kooperationspartner bei der Errichtung der anspruchsvollen DSL-Infrastruktur ist die Firma Siemens. Über die Investitionskosten des Vorhabens wahrt die Bonner Telekomzentrale Stillschweigen. Wer das neue DSI-Verfahren von T-Online nutzen will, kann das sowohl mit einem ISDN-Telefonanschluss als auch mit einer herkömmlichen Leitung. Alle momentan angebotenen ISDN-Tarife der Telekom, aber auch der "analoge" T-Net-Tarif - sind mit dem DSL-Pauschalpreis von 49 Mark kombinierbar Die notwendigen Zusatzgeräte (DSL-Modem und Splitter) werden von der Telekom zur Verfügung gestellt. Unternehmen wie die Hamburger TV-Produktionsfirma MME (Me, Myself & Eye) warten bereits sehnlichst auf eine stärkere Verbreitung von DSL-Anschlüssen. MME will auf speziellen Intemet-TV-Kanälen Pop-Konzerte und Musikvideos ausstrahlen. Für unser Geschäft sind breitbandige Internet-Zugänge zu günstigen Preisen absolut essentiell", betont Christoph Post, MME-Vorstand Neue Medien. Deshalb sind wir hocherfreut über die Aktivitäten der Telekom."
    Weniger begeistert sind die Rivalen der Telekom beim Kampf um den Telefon- und Internetmarkt. Sie werden von der TarifOffensive kalt erwischt. Arcor-Mannesmann etwa dürfte mit dem gerade eingeführten Angebot von 79 Mark für einen 768-Kilobit-Zugang in Zwangs-Kombination mit einem Hochpreis-ISDN-Anschluss beim Kunden wenig Punkte sammeln. Online-Hauptkonkurrent AOL hat das Produkt DSL-Flatrate bislang überhaupt noch nicht auf dem Plan. Dabei könnte das hauseigene Intemet-TV-Angebot AOLlive durch den DSL-Turbo profitieren. Auch bei der Bertelsmann Broadband Group (BBG) ist man mit den DSL-Offerten der Telekom nicht zufrieden. Allerdings aus anderen Gründen. Das Hamburger Unternehmen möchte über Telefonund Kabelnetze interaktives Fernsehen in die Haushalte schicken. "Die Bandbreite ist das entscheidende Handicap", sagt Michael Schacht, Leiter Produktmanagement der BBG. Um unsere Angebote über DSL-Leitungen in guter Qualität auf einen Fernseher zu schicken, reichen 768 Kilobit nicht aus. Wir brauchen mindestens zwei Megabit." Helle Aufregung herrscht bei Deutschlands Kabelnetzbetreibern. Für eine "Kriegserklärung" an die Branche hält Dietmar Schickel, Geschäftsführer des Netzbetreibers Telecolumbus, das Vorgehen der Telekom. Telecolumbus bietet M Berlin einen Highspeed-Zugang zum Web über das TV-Netz an. 49 Mark sind ein quer subventionierter Dumpingpreis. Der Monopolist zeigt seine Krallen", schimpft Schickel. Hintergrund der Empörung: In den Businessplänen der KabelnetzUnternehmen steht die Vermarktung von Highspeed-Internet-Zugängen ganz oben. Sollte die Telekom mit ihrer DSL-Großoffensive in den nächsten zwei Jahren den Markt der Highspeed-Kunden abschöpfen, könnten sich die Milliardeninvestionen, die jetzt in die Modernisierung der Kabelnetze gesteckt werden, nicht mehr rechnen. "Das Tarifdumping" mahnt Schickel, "ist ein Fall für den Regulierer"."

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