No description available.

This thesis is devoted to a component model for Web application and the corresponding tools for its development. The model is described after the review of various existing Web application development methods and models. A case study is also provided to support the analysis. / thesis (PhD)--University of South Australia, 2003.

Web information retrieval is a relatively new research area that has attracted a significant amount of interest from researchers around the world since the emergence of the World Wide Web in the early 1990s. The problems facing successful web information retrieval are a combination of challenges that stem from traditional information retrieval and challenges characterised by the nature of the World Wide Web. The goal of any information retrieval system is to provide an information need fulfilment in response to an information need. In a web setting, this means retrieving as many relevant web documents as possible in response to an inputted query that is typically limited to only containing a few terms expressive of the user's information need. This thesis is primarily concerned with firstly reviewing pertinent literature related to various aspects of web information retrieval research and secondly proposing and investigating a novel concept and context-based approach. The approach consists of techniques that can be used together or independently and aim to provide an improvement in retrieval accuracy over other approaches. A novel concept-based term weighting technique is proposed as a new method of deriving query term significance from ontologies that can be used for the weighting of inputted queries. A technique that dynamically determines the significance of terms occurring in documents based on the matching of contexts is also proposed. Other contributions of this research include techniques for the combination of document and query term weights for the ranking of retrieved documents. All techniques were implemented and tested on benchmark data. This provides a basis for performing comparison with previous top performing web information retrieval systems. High retrieval accuracy is reported as a result of utilising the proposed approach. This is supported through comprehensive experimental evidence and favourable comparisons against previously published results.

Depuis son apparition, le logiciel T-Rex (tree and reticulogram recontruction) est un outil puissant pour la reconstruction et la visualisation d'arbres phylogénétiques et de réticulogrammes. Un réticulogramme est un réseau phylogénétique permettant de représenter les phénomènes d'évolution réticulée tels que l'hybridation, la recombinaison génétique et le transfert latéral de gènes. La reconstruction peut être faite à partir des matrices de distances complètes, des matrices de distances incomplètes et des séquences moléculaires. Dans le but de permettre aux biologistes et aux bioinformaticiens de bénéficier des différentes options, modes de calcul, ainsi que des diverses nouveautés de T-Rex, nous avons développé la version Web de ce logiciel. Dans ce mémoire, nous décrivons les différentes fonctions, méthodes et outils inclus dans T-Rex Web. Nous décrivons aussi les nouveaux programmes ajoutés à T-Rex Web, tels que ClustalW, Calcul de la distance topologique de Robinson et Foulds, et Species Taxonomy. La dernière option permet de générer une matrice de distances d'arbre et de reconstruire des arbres phylogénétiques à partir des listes des lignées des espèces données. La version Web du logiciel T-Rex est disponible à l'adresse URL suivante: www.trex.uqam.ca. ______________________________________________________________________________ MOTS-CLÉS DE L’AUTEUR : T-Rex, arbre phylogénétique, matrice de distance, réticulogramme, interface Web, taxonomie d'espèces.

No description available.

The rise of the World Wide Web attracted concerns among social science scholars, especially those in the communication school who studied it by various methods like content analysis. However, the dynamic environment of the World Wide Web challenged this traditional research method, and, in turn, scholars tried to figure out valid solutions, which were summarized in the literature review section. After 2000, few studies focused on the content analysis of Web sites, while the World Wide Web developed rapidly and affected people??s everyday life. This study conducted a thematic meta-analysis to examine how researchers apply content analysis to the World Wide Web after 2000. A total of 39 studies that used content analysis to study Web sites were identified from three sources. Then data were collected and analyzed. This study found that, from 2000 to 2004, content analysis of the World Wide Web proliferated. The content analytical scholars had created new strategies to cope with challenges posed by the WWW. The suggestions made in this study forms some guidelines in the steps of content analysis research design, potentially aiding the future research of content analysis to Web sites in developing their own valid methods to study the rapid-paced WWW.

Zugl.: Graz, Techn. Univ., Diss., 2007 / Hergestellt on demand

Zugl.: Chemnitz, Techn. Univ., Diplomarbeit, 2008

Thesis (Ph. D.)--University of Missouri-Columbia, 2001. / Typescript. Vita. Includes bibliographical references (leaves 188-194). Also available on the Internet.

Thesis (Ph. D.)--University of Oregon, 2001. / Typescript. Includes vita and abstract. Includes bibliographical references (leaves 232-236). Also available for download via the World Wide Web; free to University of Oregon users.