Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 36 for “"Query Expansion"”.
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Query expansion techniques for question answering
Query expansion is a technique used to boost performance of a document retrieval engine, such as those commonly found in question answering (QA) systems. Common methods of query expansion for Boolean keyword-based document retrieval engines include inserting query terms, such as alternate …
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Query Expansion Study for Clinical Decision Support
… sources and domain knowledge to implement the expansion. In addition, we have also considered using the doc2vec model to optimize retrieval. Finally, we have applied learning to rank which sorts documents based on relevance and put relevant documents in front of irrelevant documents, so as to …
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Augmenting Dynamic Query Expansion in Microblog Texts
Dynamic query expansion is a method of automatically identifying terms relevant to a target domain based on an incomplete query input. With the explosive growth of online media, such tools are essential for efficient search result refining to track emerging themes in noisy, unstructured text …
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Intelligent personalized approaches for semantic search and query expansion
… importance in the field of personalized querying and personalized web search engines. This thesis focuses on both processes of personalized web search engines, first the reformulation of queries and second ranking query results. The importance of personalized web search lies in its …
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Interactive query expansion and relevance feedback for document retrieval systems
This thesis is aimed at investigating interactive query expansion within the context of a relevance feedback system that uses term weighting and ranking in searching online databases that are available through online vendors. Previous evaluations of relevance feedback systems have been made in …
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Investigating ontology based query expansion using a probabilistic retrieval model
… we examine the use of ontology based query expansion for defining query context. Query expansion can be done in many ways and in this work we consider the use of relevance feedback and pseudo-relevance feedback for query expansion. We examine relevance feedback and pseudo-relevance to …
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Unsupervised query expansion for theme queries by exploration and fusion
… topics than those expressed explicitly in the query terms. For this type of query, it is natural to resort to query reformation techniques such as query expansion. While traditional query expansion may be used to improve the query, new query terms are ranked only once and no verification of …
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Visual intelligence for online communities : commonsense image retrieval by query expansion
… to avoid the hit-or-miss problem. Such semantic query expansion further alleviates the requirement for exhaustive manual annotation. The third weakness of keyword-based image retrieval systems is the lack of support for retrieval by subjective content. We investigate this weakness by creating a …
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Retrieval effectiveness for OCR text using thesauri
… thesis reports on the effects of an automatic query expansion with a subject specific thesaurus on retrieval effectiveness for document collection consisting of OCR text; The investigation encompasses several experiments with a modern retrieval engine based on the probabilistic model. Each …
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Support for taxonomic data in systematics
… area of database usability, by addressing the query needs present in the community, as supported by the analysis of query logs. It formulates clearly the user requirements in the area of phylogeny and classification queries. It then reports on the use of warehousing techniques in the integration …
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Topic specific spider for taxonomic documents
… increase the number of documents collected, two query expansion techniques have been considered and evaluated. We found that generic query expansion performed better than the taxonomically expanded queries. Also, we show that filtering helps improve the performance of the system by reducing the …
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Investigation on Applying Modular Ontology to Statistical Language Model for Information Retrieval
… of two major processes, namely ontology-based query expansion (OQE) and ontology-based document classification (ODC). Research experiments have required development of an independent search tool that can combine the OQE and ODC in a traditional SLM-based information retrieval (IR) process using …
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Information Retrieval with Dense and Sparse Representations
… sparse retrieval's limitations by developing a query expansion and reranking procedure. Using pre-trained language models, we propose an expansion and reranking pipeline for better query expansion, achieving superior retrieval results both in-domain and out-of-domain, yet retaining sparse …
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Unlocking Hierarchical Structural Semantics in Hathitrust Digital Library Historical Medical Book Indexes for Information Retrieval: Two Preliminary Investigations
… knowledge for use as a thesaurus during the query expansion phase of an information retrieval process. The performance of expanded queries based on the book index was compared to the original queries and expanded queries generated through the Local Context Analysis and Word Embedding …
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Examining the Application of Modular and Contextualised Ontology in Query Expansions for Information Retrieval
… The purpose of the PhD was to use ontology-based query expansion (OQE) to improve search effectiveness by increasing search precision, i.e. retrieving relevant documents in the topmost ranked positions in a returned document list. Query experiments have required a novel search tool that can …
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Thesaurus-aided learning for rule-based categorization of Ocr texts
… using domain-specific thesauri revealed that a query expansion approach to rule-based automatic text categorization using domain-dependent thesauri will not improve the categorization of OCR texts. Although some improvement to categorization could be made using rules over a mixture of thesauri, …
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The voting model for people search
… organisation can be ranked in response to a query, so that those persons with relevant expertise to the query topic are ranked first. The expertise areas of the persons are represented by documentary evidence of expertise, known as candidate profiles. The statement of this research work is …
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Spatio-temporal Event Detection and Forecasting in Social Media
… Five methods are proposed, namely dynamic query expansion for event detection, a generative framework for event forecasting, multi-task learning for spatiotemporal event forecasting, multi-source spatiotemporal event forecasting, and deep learning based epidemic modeling for forecasting …
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Enhancing General Language Models for Biomedical Test Retrieval via Diversified Prior Knowledge
… core components. The first, Knowledge-based Query Expansion, leverages authoritative biomedical databases to enrich search queries with domain-specific entities. The second, Aspect-based Filter, identifies documents that are highly relevant to the query. The third, Diversity-based Score …
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Spatiotemporal Event Forecasting and Analysis with Ubiquitous Urban Sensors
… incident detection platform; 2) proposing a query expansion algorithm for traffic-related tweets; and 3) developing a text summarization tool for redundant traffic-related tweets. Cyberbullying detection from social media platforms is one of the major focus of this work: 1) Developing an …
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