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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

Development, evaluation and application of a geographic information retrieval system

Hu, You-Heng, Surveying & Spatial Information Systems, Faculty of Engineering, UNSW January 2007 (has links)
Geographic Information Retrieval (GIR) systems provide users with functionalities of representation, storage, organisation of and access to various types of electronic information resources based on their textual and geographic context. This thesis explores various aspects of the development, evaluation and application of GIR systems. The first study focuses upon the extraction and grounding of geographic information entities. My approach for this study consists of a hierarchical structure-based geographic relationship model that is used to describe connections between geographic information entities, and a supervised machine learning algorithm that is used to resolve ambiguities. The proposed approach has been evaluated on a toponym disambiguation task using a large collection of news articles. The second study details the development and validation of a GIR ranking mechanism. The proposed approach takes advantage of the power of the Genetic Programming (GP) paradigm with the aim of finding an optimal functional form that integrates both textual and geographic similarities between retrieved documents and a given user query. My approach has been validated by applying it to a large collection of geographic metadata documents. The third study addresses the problem of modelling the GIR retrieval process that takes into account both thematic and geographic criteria. Based on the Spreading Activation Network (SAN), the proposed model consists a two-layer associative network that is used to construct a structured search space; a constrained spreading activation algorithm that is used to retrieve and to rank relevant documents; and a geographic knowledge base that is used to provide necessary domain knowledge for network. The retrieval performance of my model has been evaluated using the GeoCLEF 2006 tasks. The fourth study discusses the publishing, browsing and navigation of geographic information on the World Wide Web. Key challenges in designing and implementing of a GIR user interface through which online content can be systematically organised based on their geospatial characteristics, and can be efficiently accessed and interrelated, are addressed. The effectiveness and the usefulness of the system are shown by applying it to a large collection of geo-tagged web pages.

Using contextual information and machine learning technique to improve retrieval performance /

Huang, Yan Rui. January 2006 (has links)
Thesis (M.Sc.)--York University, 2006. Graduate Programme in Computer Science and Engineering. / Typescript. Includes bibliographical references (leaves 117-126). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:MR19678

A study of critical factors affecting the development of performance measures in evaluating bibliographic information retrieval systems

Regazzi, John J., January 1983 (has links)
Thesis (Ph. D.)--Rutgers University, 1983. / Typescript. "Graduate School of Library and Information Studies." Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

The use of graph theory in modelling thematic structure in the content of documents

Farbey, B. A. January 1984 (has links)
No description available.

Modelling the IR task : supporting the user

Ennis, Mark January 1998 (has links)
No description available.

Distributed inverted files and performance : a study of parallelism and data distribution methods in IR

Macfarlane, Andrew January 2000 (has links)
No description available.

Criteria for user-friendliness in retrieval software design

Trenner, Lesley January 1988 (has links)
No description available.

The entity relationship model as a basis for information retrieval

Pitkin, W. J. January 1984 (has links)
No description available.

Cooperative working in an open hypermedia environment

Melley, Mylene January 1995 (has links)
No description available.

An associative text FILTER for micro-computer based document retrieval

Barros, Silvano Piedade Venacio January 1983 (has links)
No description available.

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