abstract: Semantic web is the web of data that provides a common framework and technologies for sharing and reusing data in various applications. In semantic web terminology, linked data is the term used to describe a method of exposing and connecting data on the web from different sources. The purpose of linked data and semantic web is to publish data in an open and standard format and to link this data with existing data on the Linked Open Data Cloud. The goal of this thesis to come up with a semantic framework for integrating and publishing linked data on the web. Traditionally integrating data from multiple sources usually involves an Extract-Transform-Load (ETL) framework to generate datasets for analytics and visualization. The thesis proposes introducing a semantic component in the ETL framework to semi-automate the generation and publishing of linked data. In this thesis, various existing ETL tools and data integration techniques have been analyzed and deficiencies have been identified. This thesis proposes a set of requirements for the semantic ETL framework by conducting a manual process to integrate data from various sources such as weather, holidays, airports, flight arrival, departure and delays. The research questions that are addressed are: (i) to what extent can the integration, generation, and publishing of linked data to the cloud using a semantic ETL framework be automated; (ii) does use of semantic technologies produce a richer data model and integrated data. Details of the methodology, data collection, and application that uses the linked data generated are presented. Evaluation is done by comparing traditional data integration approach with semantic ETL approach in terms of effort involved in integration, data model generated and querying the data generated. / Dissertation/Thesis / Masters Thesis Computer Science 2016

Made available in DSpace on 2014-06-12T15:54:41Z (GMT). No. of bitstreams: 2 arquivo1991_1.pdf: 2164656 bytes, checksum: 1155c56e11920c8db2f44538c0dec97f (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2008 / Em ambientes corporativos e heterogêneos, o compartilhamento de recursos para a resolução de problemas é fortemente associado à segurança da informação. Um aspecto crítico a ser considerado para as organizações é a exigência de uma eficaz e eficiente aquisição e distribuição de conhecimento a respeito de riscos, vulnerabilidades e ameaças que podem ser, portanto, exploradas e causar incidentes de segurança e impactar negativamente nos negócios. Os diversos ambientes de atuação humana necessitam de meios transparentes para planejar e gerenciar problemas relacionados à segurança da informação. Há um aumento significativo na complexidade de se projetar e planejar segurança necessitando que meios de manipulação da informação sejam adotados. Para isso, esta dissertação propõe uma ontologia para este domínio de segurança computacional, denominada CoreSec. O estudo visa demonstrar que uma vez que o conhecimento é formalizado, é possível reusá-lo, realizar inferência, processá-lo computacionalmente, como também torna-se passível de comunicação entre seres humanos e agentes inteligentes. Nossa proposta considera que a segurança da informação será mais eficiente se esta for baseada em um modelo formal de informações do domínio, tal como uma ontologia, podendo ser aplicada para auxiliar as atividades dos responsáveis de segurança, na análise e avaliação de riscos, elicitação de requisitos de segurança, análise de vulnerabilidades e desenvolvimento de ontologias mais específicas para o domínio de segurança da informação

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The Semantic Web and Linked Data movements with the aim of creating, publishing and interconnecting machine readable information have gained traction in the last years. However, the majority of information still is contained in and exchanged using unstructured documents, such as Web pages, text documents, images and videos. This can also not be expected to change, since text, images and videos are the natural way in which humans interact with information. Semantic structuring of content on the other hand provides a wide range of advantages compared to unstructured information. Semantically-enriched documents facilitate information search and retrieval, presentation, integration, reusability, interoperability and personalization. Looking at the life-cycle of semantic content on the Web of Data, we see quite some progress on the backend side in storing structured content or for linking data and schemata. Nevertheless, the currently least developed aspect of the semantic content life-cycle is from our point of view the user-friendly manual and semi-automatic creation of rich semantic content. In this thesis, we propose a semantics-based user interface model, which aims to reduce the complexity of underlying technologies for semantic enrichment of content by Web users. By surveying existing tools and approaches for semantic content authoring, we extracted a set of guidelines for designing efficient and effective semantic authoring user interfaces. We applied these guidelines to devise a semantics-based user interface model called WYSIWYM (What You See Is What You Mean) which enables integrated authoring, visualization and exploration of unstructured and (semi-)structured content. To assess the applicability of our proposed WYSIWYM model, we incorporated the model into four real-world use cases comprising two general and two domain-specific applications. These use cases address four aspects of the WYSIWYM implementation: 1) Its integration into existing user interfaces, 2) Utilizing it for lightweight text analytics to incentivize users, 3) Dealing with crowdsourcing of semi-structured e-learning content, 4) Incorporating it for authoring of semantic medical prescriptions.

可信度是網路服務首要解決的問題，我們從數位憑證，認證、授權、委任授權等安全層面去研究代理者可信度，並提出一套完整可信度規則分類機制當作信任度判斷的依據。在此篇論文中，我們論證如何將規則概念應用在代理者的溝通協定、服務流程控制上。我們並同時整合語意網規則和本體論的技術，以達到可信的網路服務環境。 / Trust is one of the most important issues for Web Services. We studied the agent trust problem based on security technologies, such as digital certificates, authentication, authorization, and delegation, etc. Furthermore, we propose a complete trust rule taxonomy mechanism to assistant us on the evaluation of agent trustworthiness. In this thesis, we justify the feasibility of using rule concepts on the agent communication protocol and service process control. We also demonstrated how to integrate the semantic web rules and ontologies to have a trusted web services environment.

This thesis builds a foundation for the philosophy of theWeb by examining the crucial question: What does a Uniform Resource Identifier (URI) mean? Does it have a sense, and can it refer to things? A philosophical and historical introduction to the Web explains the primary purpose of theWeb as a universal information space for naming and accessing information via URIs. A terminology, based on distinctions in philosophy, is employed to define precisely what is meant by information, language, representation, and reference. These terms are then employed to create a foundational ontology and principles ofWeb architecture. From this perspective, the SemanticWeb is then viewed as the application of the principles of Web architecture to knowledge representation. However, the classical philosophical problems of sense and reference that have been the source of debate within the philosophy of language return. Three main positions are inspected: the logicist position, as exemplified by the descriptivist theory of reference and the first-generation SemanticWeb, the direct reference position, as exemplified by Putnamand Kripke’s causal theory of reference and the second-generation Linked Data initiative, and a Wittgensteinian position that views the Semantic Web as yet another public language. After identifying the public language position as the most promising, a solution of using people’s everyday use of search engines as relevance feedback is proposed as a Wittgensteinian way to determine sense of URIs. This solution is then evaluated on a sample of the Semantic Web discovered by via using queries from a hypertext search engine query log. The results are evaluated and the technique of using relevance feedback from hypertext Web searches to determine relevant Semantic Web URIs in response to user queries is shown to considerably improve baseline performance. Future work for the Web that follows from our argument and experiments is detailed, and outlines of a future philosophy of the Web laid out.

The shift towards global networking brings with it many opportunities and challenges. In this paper, we discuss key technologies in achieving global semantic interoperability among heterogeneous information systems, including both traditional and web data sources. In particular, we focus on the importance of this capability and technologies we have designed to overcome ontological heterogeneity, a common type of disparity in financial information systems. Our approach to representing and reasoning with ontological heterogeneities in data sources is an extension of the Context Interchange (COIN) framework, a mediator-based approach for achieving semantic interoperability among heterogeneous sources and receivers. We also analyze the issue of ontological heterogeneity in the context of source-selection, and offer a declarative solution that combines symbolic solvers and mixed integer programming techniques in a constraint logic-programming framework. Finally, we discuss how these techniques can be coupled with emerging Semantic Web related technologies and standards such as Web-Services, DAML+OIL, and RuleML, to offer scalable solutions for global semantic interoperability. We believe that the synergy of database integration and Semantic Web research can make significant contributions to the financial knowledge integration problem, which has implications in financial services, and many other e-business tasks. / Singapore-MIT Alliance (SMA)

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Thesis (Ph. D.)--College of Computing, Georgia Institute of Technology, 2004. Directed by Ling Liu. / Vita. Includes bibliographical references (leaves 147-155).

published_or_final_version / abstract / toc / Computer Science and Information Systems / Master / Master of Philosophy