Search (6 results, page 1 of 1)

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Source

Journal of the American Society for Information Science and technology. 52(2001) no.10, S.829-875

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Abstract

Multimedia und Internet, Hypertext und Hypermedia - spannende Begriffe an der Schwelle zum nächsten Jahrtausend. Das Fachbuch behandelt technologische Grundlagen multimedialer Informationssysteme: - Information und Kommunikation / Signale und Codierung / Audiotechnik / Videotechnik / Multimedia via Internet

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Abstract

Multimedia is proliferating on Web sites, as the Web continues to enhance the integration of multimedia and textual information. In this paper we examine trends in multimedia Web searching by Excite users from 1997 to 2001. Results from an analysis of 1,025,910 Excite queries from 2001 are compared to similar Excite datasets from 1997 to 1999. Findings include: (1) queries per multimedia session have decreased since 1997 as a proportion of general queries due to the introduction of multimedia buttons near the query box, (2) multimedia queries identified are longer than non-multimedia queries, and (3) audio queries are more prevalent than image or video queries in identified multimedia queries. Overall, we see multimedia Web searching undergoing major changes as Web content and searching evolves.

Source

Information processing and management. 39(2003) no.4, S.611-621

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Source

Information - Wissenschaft und Praxis. 53(2002) H.8, S.457-460

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Abstract

Relevance has been a difficult concept to define, let alone measure. In this paper, a simple operational definition of relevance is proposed for a Web-based library catalog: whether or not during a search session the user saves, prints, mails, or downloads a citation. If one of those actions is performed, the session is considered relevant to the user. An analysis is presented illustrating the advantages and disadvantages of this definition. With this definition and good transaction logging, it is possible to ascertain the relevance of a session. This was done for 905,970 sessions conducted with the University of California's Melvyl online catalog. Next, a methodology was developed to try to predict the relevance of a session. A number of variables were defined that characterize a session, none of which used any demographic information about the user. The values of the variables were computed for the sessions. Principal components analysis was used to extract a new set of variables out of the original set. A stratified random sampling technique was used to form ten strata such that each new strata of 90,570 sessions contained the same proportion of relevant to nonrelevant sessions. Logistic regression was used to ascertain the regression coefficients for nine of the ten strata. Then, the coefficients were used to predict the relevance of the sessions in the missing strata. Overall, 17.85% of the sessions were determined to be relevant. The predicted number of relevant sessions for all ten strata was 11 %, a 6.85% difference. The authors believe that the methodology can be further refined and the prediction improved. This methodology could also have significant application in improving user searching and also in predicting electronic commerce buying decisions without the use of personal demographic data

Source

Journal of the American Society for Information Science and technology. 52(2001) no.10, S.829-830

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Abstract

Ein Problem der Erstellung von Multimediaanwendungen in Unternehmen ist, dass die Sachkompetenz bezüglich der darzustellenden Inhalte nicht immer bei denjenigen Mitarbeitern liegt, die die Kompetenz für die mediengerechte Aufbereitung haben. Um umfangreiche Hypertextanwendungen - ggf. auch mit interaktiven Aufgaben Lind Multimediaelernenten - zu erzeugen, können Sachautoren von dem Umgang mit Multimediasoftware weitgehend entlastet werden. Der von den Sachautoren verfasste Text ist dazu von vornherein mit minimalen Textauszeichnungen zu versehen. Dazu braucht er seine Textverarbeitung nicht zu verlassen. Um jetzt einen interaktiven Hypertext oder eine 1 lypermediaanwendung mit einzelnen Einträgen und zusätzlichen umfangreichen Navigationskomponenten zu erzeugen und weitere Medien an den jeweils richtigen Stellen einzufügen, ist ein Programm erforderlich, das die Anwendung erzeugen hilft (Engine). Zu den Themen "Hypertext" und "Multimedia" erscheinen etliche Publikationen. Eine Vielzahl von ihnen hat theoretische und konzeptionelle Aspekte zum Inhalt (z. B. Lobin 1999, Brusilovsky 1998, Rouet 1996). Manche betonen den Anwendungsbezug (Gerdes 1997, Hofinann/Simon 1995), der unter besonderer Berücksichtigung für Information oder Ausbildung gesehen werden kann (vgl. Glowalla 1992). Andere sind von historischem Interesse (Nelson 1992), klären die Begrifflichkeit und die Grundlagen (Schnupp 1992, Kuhlen 1991, Seyer 1991, Nielsen 1990, Hashim 1990) oder geben Hinweise auf die Benutzung (MacGrew 1989). Ferner gibt es programmspezifische Literatur, die die technische Handhabung bei der Erstellung unterstützt. Solche Literatur kann genutzt werden, um Aspekte zu gewinnen, die für die Anlage und Ausrichtung einer Hypertextanwendung sinnvoll sind. Werden hingegen existierende Hypertextanwendungen betrachtet, so bleibt der damit verbundene Aufwand und die Organisationsstruktur oft im Dunkeln