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 35 for “"SPARQL"”.
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Parallel SPARQL Query Execution using Apache Spark
… such as Resource Description Framework (RDF) and SPARQL are increasingly being adopted by applications on the Web, as well as in domains such as healthcare, finance, and national security and intelligence. While we have witnessed an era of many different techniques for RDF indexing and SPARQL …
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A New Approach for Fast Processing of SPARQL Queries on RDF Quadruples
… for fast and cost-effective processing of SPARQL queries on large RDF datasets containing RDF quadruples (or quads). Our approach employs a decrease-and-conquer strategy: Rather than indexing the entire RDF dataset, it identifies groups of similar RDF graphs and indexes each group …
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Improving the Performance of Parallel SPARQL Query Processing on Apache Spark Using Bloom Filters
… to represent entities and their relationships. SPARQL is the query language for RDF. Today, popular knowledge bases on the Web (e.g., Wikidata, YAGO, Linked Data) employ RDF and SPARQL for representing data and querying relevant information. There is also a growing number of applications in …
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Federated Query Processing for the Semantic Web
… exposed by means of Linked Data-enabled URIs and SPARQL endpoints. Given the sustained growth that we are experiencing in the number of SPARQL endpoints available, the need to be able to send federated SPARQL queries across them has also grown. Tools for accessing sets of RDF data repositories are …
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A question to query LLM as a pipeline replacement in knowledge graph question answering systems
… question directly into an executable SPARQL query. We fine-tune instruction-tuned backbones, Llama-3.1-8B-Instruct and Mistral-7B-Instruct, on paired (question, gold SPARQL) examples, which are formatted through chat templates. As a result, the models can perform single-step query …
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Semantic querying and search in distributed ontologies
… qualified linked data URIs and endpoints of SPARQL. Continuous development that we are experiencing in SPARQL endpoints requires accessing sets of distributed RDF data repositories is getting popularity. This research has offered an extensive analysis of accessing RDF data across distributed …
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What's in a query : analyzing, predicting, and managing linked data access
… Framework (RDF) as a Linked Data model or the SPARQL Protocol and RDF Query Language (SPARQL) for retrieving this information. Whereas most research has been conducted in the area of generating and publishing Linked Data, this thesis presents novel approaches for improved management. In …
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Valid Time RDF
… new constructs to RDF and its query language, SPARQL. We first study these models in a comparative framework and develop a taxonomy for classifying them. On this basis, we propose a new temporal data model, Valid Time RDF, or VTRDF, that incorporates valid time explicitly into RDF. We define …
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Adapting Semantic Web Information Retrieval to Multimedia
… standard query language for the Semantic Web (SPARQL) with media specific concepts and functions. The main contributions of the work are an exhaustive survey on Multimedia query languages of the last 3 decades, the SPARQL extension specification itself and an approach for the efficient …
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Distributed RDF query processing and reasoning for big data / linked data
… of such statements shapes an RDF graph. SPARQL is a query language designed specifically to query RDF data. Linked Data faces the same challenge that Big Data does. We now lead the way to a new wave of a new paradigm, Big Data and Linked Data that identify massive amounts of data in a …
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Supporting Dynamic Queries and Annotations Over Data Graphs
… Specifically, we extend the RDF data model and SPARQL with the notion of variables and named query graphs (i.e., dynamic graphs defined by a SPARQL query) as first-class citizens. By doing so, we allow statements where subjects and objects in RDF triples are dynamic graphs, thus enabling the …
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Information privacy for linked data
… involves the design and implementation of the SPARQL Privacy Insurance Module (SPIM). Using a combination of well-studied techniques, such as authentication and access control, and the mechanisms developed to maintain differential privacy over linked data, it attempts to limit privacy hazards …
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Towards Knowledge Graph Construction From Unstructured Text with LLMs, Triple Identification and Alignment to Wikidata
… tools, such as semantic dependency parsing and SPARQL querying, to extract and align triples with Wikidata entities. Doc-KG includes a predicate mapping mechanism and is evaluated both quantitatively and qualitatively against existing approaches. The advent of LLMs such as GPTs marked a …
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Towards Knowledge Graph Construction From Unstructured Text with LLMs, Triple Identification and Alignment to Wikidata
… tools, such as semantic dependency parsing and SPARQL querying, to extract and align triples with Wikidata entities. Doc-KG includes a predicate mapping mechanism and is evaluated both quantitatively and qualitatively against existing approaches. The advent of LLMs such as GPTs marked a …
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A Framework Supporting Development of Ontology-Based Web Applications
… own customized functions. The framework supports SPARQL-DL query language. The purpose of this framework is to shield the complexity of ontology from the users and thereby ease the development of ontology based Web applications. Having high quality ontology and using this framework, the end-users …
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Question Answering on Dynamic Knowledge Graph for Chemistry
… text classification locates suitable SPARQL query templates. SPARQL queries are formed by filling semantic representations into templates, enabling data retrieval. Evaluation results show that the system outperforms Wolfram Alpha and Google Search Engine baselines in some question …
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Natural Language Interfaces to Conceptual Models
… use of formal query languages (e.g., SeRQL or SPARQL) which pose significant difficulties for non-expert users. One way to lower the learning overhead and make ontology queries more straightforward is through a Natural Lan- guage Interface (NLI). While there are existing NLIs to structured data …
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Semantic Web Based Relational Database Access With Conflict Resolution
… then access the underlying data source through SPARQL queries. The proposed approach takes into consideration the different relationships between the entities of the database schema when it extracts the mapping and the equivalent ontology. Instead of extracting a flat ontology that is an exact …
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An Approach for Building and Querying Linked Datasets
… and Simple Protocol and RDF Query Language (SPARQL) for querying the information used in web documents. In 2005, Sterling [55] described an object whose “informational support is so overwhelmingly extensive and rich that it is regarded as a material instantiation of an immaterial system”. He …
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A semantic data federation engine : design, implementation & applications in educational information management
… Web are: an integrated system for executing SPARQL queries; and, an optimizer that faciliates efficient querying by exploiting statistical information about the data sources.
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