Contextual information retrieval (CIR) is a critical technique for today’s search engines in terms of facilitating queries and returning relevant information. Despite its importance, little progress has been made in its application, due to the difficulty of capturing and representing contextual information about users. This thesis details the development and evaluation of the contextual SERL search, designed to tackle some of the challenges associated with CIR from the World Wide Web. The contextual SERL search utilises a rich contextual model that exploits implicit and explicit data to modify queries to more accurately reflect the user’s interests as well as to continually build the user’s contextual profile and a shared contextual knowledge base. These profiles are used to filter results from a standard search engine to improve the relevance of the pages displayed to the user. The contextual SERL search has been tested in an observational study that has captured both qualitative and quantitative data about the ability of the framework to improve the user’s web search experience. A total of 30 subjects, with different levels of search experience, participated in the observational study experiment. The results demonstrate that when the contextual profile and the shared contextual knowledge base are used, the contextual SERL search improves search effectiveness, efficiency and subjective satisfaction. The effectiveness improves as subjects have actually entered fewer queries to reach the target information in comparison to the contemporary search engine. In the case of a particularly complex search task, the efficiency improves as subjects have browsed fewer hits, visited fewer URLs, made fewer clicks and have taken less time to reach the target information when compared to the contemporary search engine. Finally, subjects have expressed a higher degree of satisfaction on the quality of contextual support when using the shared contextual knowledge base in comparison to using their contextual profile. These results suggest that integration of a user’s contextual factors and information seeking behaviours are very important for successful development of the CIR framework. It is believed that this framework and other similar projects will help provide the basis for the next generation of contextual information retrieval from the Web.

[Truncated abstract] Following the introduction in 1999 of Australian Accounting Standard Board (AASB) 1041: 'Revaluations of Non-Current Assets' (Australian Accounting Standards Board 2001a), this study set out to examine the impact of the introduction of this new standard on: the number (percentage) of Australian firms revaluing various classes and submajor classes of non-current assets; and the value relevance and reliability of the information provided with respect to various sub-major classes of non-current assets. The study also set out to examine the apparent motivations for Australian companies electing the fair value (FV) basis, rather than the historic cost (HC) basis, for reporting property, plant and equipment (PP&E). The sample analysed in this study consisted of Australian Stock Exchange (ASX) listed firms that were included in each of the Connect4, Aspect Financial and Core Research Data (CRD) databases. After excluding firms not covered by all three databases and firms where there were missing data problems, 398 and 424 firms were left in the 1999 and 2002 samples, respectively. Of the 398 and 424 firms, there were 194 firms that were common to both sample periods and a separate analysis of these 'common' firms allowed a 'like-for-like' comparison to be made. The financial year ending June 30, 1999 provides data under the previous standard AASB 1010 (Australian Accounting Standards Board 2000) before the introduction of AASB 1041, while the financial year ending 30 June 2002 provides data under AASB 1041 (the new standard). ... At the disaggregated level (that is, for various sub-major classes of non-current assets), it appears that there was a decline in the number (percentage) of firms choosing to revalue investment property, property, and plant and equipment, while there was no change in the number (percentage) of firms choosing to revalue listed or unlisted investments. It appears that AASB 1041's requirement to revalue frequently when the FV basis was adopted discouraged firms from choosing the FV basis for some asset classes, presumably because the costs associated with frequent revaluations outweighed the perceived benefits. In terms of value relevance, the results suggest that where the variables of interest are scaled there was no improvement in the value relevance of the information provided by Australian companies following the introduction of AASB 1041. However, the results from the unscaled regressions do not support this conclusion and instead suggest that the introduction of AASB 1041 was associated with an overall improvement in the value relevance of the information provided with respect to the various sub-major classes of non-current assets investigated in this study. Resolution of this conflicting result is beyond the scope of this dissertation and is an issue worthy of future research. In terms of reliability, the results suggest that the introduction of AASB 1041 was generally associated with: an improvement in the reliability of information reported with respect to non-current assets reported at FV; and a deterioration in the reliability of information reported with respect to non-current assets reported at HC. Finally, with respect to the potential motivations behind a company's choice of the FV basis for reporting PP&E, the results suggest that firms are motivated to revalue PP&E to: improve their borrowing capacity; for signalling purposes; and to reduce information asymmetry.

abstract: Diabetic retinopathy (DR) is a common cause of blindness occurring due to prolonged presence of diabetes. The risk of developing DR or having the disease progress is increasing over time. Despite advances in diabetes care over the years, DR remains a vision-threatening complication and one of the leading causes of blindness among American adults. Recent studies have shown that diagnosis based on digital retinal imaging has potential benefits over traditional face-to-face evaluation. Yet there is a dearth of computer-based systems that can match the level of performance achieved by ophthalmologists. This thesis takes a fresh perspective in developing a computer-based system aimed at improving diagnosis of DR images. These images are categorized into three classes according to their severity level. The proposed approach explores effective methods to classify new images and retrieve clinically-relevant images from a database with prior diagnosis information associated with them. Retrieval provides a novel way to utilize the vast knowledge in the archives of previously-diagnosed DR images and thereby improve a clinician's performance while classification can safely reduce the burden on DR screening programs and possibly achieve higher detection accuracy than human experts. To solve the three-class retrieval and classification problem, the approach uses a multi-class multiple-instance medical image retrieval framework that makes use of spectrally tuned color correlogram and steerable Gaussian filter response features. The results show better retrieval and classification performances than prior-art methods and are also observed to be of clinical and visual relevance. / Dissertation/Thesis / M.S. Electrical Engineering 2012

A presente tese tem como principal objetivo investigar a aplicação do princípio da relevância, proveniente da Teoria da Relevância de Sperber e Wilson (1986; 1995), em um sistema hipermidia adaptativo de apoio educacional. Essa investigação, de caráter exploratório, através de um estudo de caso, visa observar o comportamento do usuário no sistema quando são feitas sugestões de tópicos de estudo de acordo com a relevância de cada um. A relevância, uma propriedade de entradas para processos cognitivos, é uma função baseada na relação econômica de custo/benefício. Segundo a teoria, o custo é o esforço de processamento requerido para assimilar uma nova informação e o benefício, o efeito contextual obtido, ou seja, o benefício cognitivo que o indivíduo pode obter no processamento de tal informação. O sistema foi modelado com base em um framework conceitual adaptativo que previa o uso de uma ontologia de domínio como estrutura de conhecimento. Essa ontologia foi avaliada e valorada por especialistas. A instanciação deste framework aconteceu no domínio de preparação para certificação em testes de proficiência da língua japonesa. As técnicas de adaptação adotadas foram no sentido de guiar a navegação no sistema através do método de sugestão de tópicos relevantes, proposto neste trabalho. O estudo de caso consistiu em observar todo o processo de interação dos usuários com duas versões do sistema, a tradicional e a adaptativa. Os dados coletados foram analisados e interpretados com base em indicadores que consideraram, dentre outros, o comportamento navegacional e a relevância das trajetórias de aprendizagem. / The main goal of this thesis consists in the investigation of the application of the principle of relevance in an adaptive hypermedia system for educational support. This principle comes from Sperber and Wilson‟s Relevance Theory (1986, 1995). This exploratory research, conducted through a case study, aims to observe users‟ behavior on the system when suggestions of topics of study according to their relevance are given. Relevance, a property of inputs to cognitive processes, is a function based on the economical cost/benefit relation. According to the theory, the cost is the processing effort required to assimilate new information and the benefit, the contextual effect obtained, ie, the cognitive benefit that the individual can get from processing such information. The system was modeled based on a conceptual adaptive framework which considered the use of a domain ontology as the knowledge structure. This ontology has been assessed and valued by experts. The instantiation of this framework took place in the area of preparation for certification of proficiency in Japanese language. The adaptation techniques were adopted in order to guide the navigation in the system through the method of suggesting relevant topics, proposed in this work. The case study was held to observe the entire interaction process of users with two versions of the system, the traditional and the adaptive ones. The data collected were analyzed and interpreted based on indicators that considered, among others, the navigational behavior and the relevance of learning paths.

Problem: Sustainability and sustainable development has gained more attention in recent years. As a result, companies are more committed to taking responsibility and demonstrating that it contributes to a sustainable society by publishing a sustainability report. An industry that has proved to be a major problem, and which has become increasingly demanding in the sustainability issue, is the construction industry. However, previous research has shown that sustainability reports have shortcomings in its quality. Purpose: The purpose of this paper is to describe and enhance understanding of the concept of quality and quality in sustainability reports. The study aims at investigating and determining the quality of Swedish companies' sustainability reports between 2014 and 2016 and investigating whether there has been a development regarding the quality of the reports. Methodology: Based on the purpose of the study, a comparative cross-sectional design is used and a combination of quantitative and qualitative research strategy. A content analysis is done by companies' sustainability reports and its quality is assessed based on a predetermined coding scheme. Results and conclusions: The results show that the quality of corporate sustainability reports has increased between 2014 and 2016, but there is still room for improvement. The relevance of sustainability reporting exceeded its credibility. / Problem: Ämnet hållbarhet och hållbar utveckling har under de senaste åren fått allt större uppmärksamhet. I takt med det har företagen får större krav på sig att ta ansvar och visa på att det bidrar till ett hållbart samhälle genom att upprätta en hållbarhetsrapport. En bransch som visat sig vara ett stort problem och som fått allt större krav på sig i hållbarhetsfrågan är byggbranschen. Tidigare forskning har dock visat att hållbarhetsrapporter har haft stora brister i kvaliteten. Syfte: Syftet med denna uppsats är att beskriva och öka förståelsen för begreppet kvalitet och kvalitet i hållbarhetsredovisningar. Studien syftar till att undersöka och fastställa kvaliteten i svenska företags hållbarhetsredovisningar mellan år 2014 och 2016 och undersöka om en utveckling har skett avseende rapporternas kvalitet. Metod: Utifrån studiens syfte används en komparativ tvärsnittsdesign och en kombination av kvantitativ och kvalitativ forskningsstrategi används. En innehållsanalys görs av företagens hållbarhetsredovisningar och dess kvalitet bedöms utifrån ett förutbestämt kodningsschema. Resultat och slutsats: Resultatet visar att kvaliteten i företagens hållbarhetsrapporter har ökat mellan åren 2014 och 2016 men att det fortfarande finns utrymme för förbättring. Hållbarhetsredovisningens relevans översteg dess trovärdighet.

Esta pesquisa mapeia, analisa e problematiza as noções que os leitores mobilizam para avaliar a relevância jornalística nas publicações dos jornais brasileiros de referência no Facebook. Por meio da metodologia da Análise do Discurso, foram examinados 59.786 comentários de 211 publicações dos jornais Folha de S.Paulo, O Estado de S.Paulo e O Globo, no período de abril de 2016. A análise resultou em quatro indicadores de relevância utilizados pelos leitores: o interesse individual, a atribuição de importância, a novidade e a atribuição de qualidade. No interesse individual, os leitores vincularam a relevância das notícias à satisfação de interesses pessoais, se autorreferenciando como critério. A atribuição de importância foi dividida em três sentidos: a rejeição ao não importante, às notícias que os sujeitos consideraram inúteis ou fúteis; a indicação do que é mais importante de acordo com a hierarquização e opinião próprias do leitor; e a contestação dos enquadramentos, questionando os tipos de informações destacadas nas notícias. A falta de novidade foi indicada como um valor associado à relevância, pois o novo é uma expectativa da audiência em relação ao jornalismo. E a atribuição de qualidade pôde ser inferida por meio das deficiências apontadas, como informações erradas e falta de isenção e pluralidade. A análise ainda verificou que os sujeitos percebem algumas lógicas do ambiente digital, como o maior número de fontes de informação, a restrição de acesso nos websites dos jornais, a leitura somente dos títulos das notícias e a consciência da economia do clique. Por último, foram identificadas situações de conversação entre os leitores relacionadas ao interesse (pessoal e dos outros) e à relevância das notícias de entretenimento. A partir do levantamento teórico associado à análise dos comentários, concluímos que a relevância é construída subjetivamente pelos leitores, a partir de posições sociais e ideológicas, que consideram parâmetros próprios de interesse e parâmetros aprendidos da prática de leitura do jornalismo. Esses leitores mobilizam graus diferenciados de importância, relacionando-a com a novidade e a qualidade jornalística, e estão circundados por lógicas conectivas, interativas e informativas das redes sociais. / This research maps, analyzes and problematizes the notions that readers mobilize when evaluating the journalistic relevance of posts by reference Brazilian newspapers on Facebook. Using the methodology of Discourse Analysis, 59,780 comments were analyzed on 211 posts by the newspapers Folha de S. Paulo, O Estado de S. Paulo and O Globo, during April 2016. The analysis resulted in four indicators of relevance used by the readers: individual interest, attribution of importance, novelty and attribution of quality. Under individual interest, the readers linked the relevance of the news to the satisfaction of personal interests, taking self-referencing as the criterion. Attribution of importance was divided into three senses: rejection of the non-important, of news that the subjects consider useless or futile; indication of what is most important according to the reader's own opinion and hierarchization; and contestation of frameworks, questioning the types of information highlighted in the news. The lack of novelty was indicated as a value associated to relevance, since new is an expectation by the audience in relation to journalism. Attribution of quality was inferred from the deficiencies pointed out, such as misinformation and lack of exemption and plurality. The analysis also verified that the subjects perceive some of the logics of the digital environment, such as the increase of information sources, websites with restricted access of the newspapers, reading headlights only and the consciousness of click economy. Lastly, conversational situations between readers were identified regarding interest (personal and of others) and also regarding the relevance of entertainment news. From the theoretical survey associated to the analysis of the comments, we have concluded that relevance is constructed subjectively by readers, from social and ideological positions, who consider personal parameters of interest and parameters learned through the practice of journalistic reading. Readers mobilize different degrees of importance, relating it to novelty and journalistic quality, and are surrounded by connective, interactive and informative logics of social networks.

Páginas-objeto são páginas que representam exatamente um objeto inerente do mundo real na web, considerando um domínio específico, e a busca por essas páginas é chamada de busca-objeto. Os motores de busca convencionais (do Inglês, General Search Engine - GSE) conseguem responder, de forma satisfatória, à maioria das consultas realizadas na web atualmente, porém, isso dificilmente ocorre no caso de buscas-objeto, uma vez que, em geral, a quantidade de páginas-objeto recuperadas é bastante limitada. Essa dissertação propõe um novo método para a identificação e a busca de páginas-objeto, denominado OPIS (acrônimo para Object Page Identifying and Searching). O cerne do OPIS está na adoção de técnicas de realimentação de relevância e aprendizagem de máquina na tarefa de classificação, baseada em conteúdo, de páginas-objeto. O OPIS não descarta o uso de GSEs e, ao invés disso, em sua etapa de busca, propõe a integração de um classificador a um GSE, adicionando uma etapa de filtragem ao processo de busca tradicional. Essa abordagem permite que somente páginas identificadas como páginas-objeto sejam recuperadas pelas consultas dos usuários, melhorando, assim, os resultados de buscas-objeto. Experimentos, considerando conjuntos de dados reais, mostram que o OPIS supera o baseline com ganho médio de 47% de precisão média. / Object pages are pages that represent exactly one inherent real-world object on the web, regarding a specific domain, and the search for these pages is named as object search. General Search Engines (GSE) can satisfactorily answer most of the searches performed in the web nowadays, however, this hardly occurs with object search, since, in general, the amount of retrieved object pages is limited. This work proposes a method for both identifying and searching object pages, named OPIS (acronyms to Object Page Identifying and Searching). The kernel of OPIS is to adopt relevance feedback and machine learning techniques in the task of content-based classification of object pages. OPIS does not discard the use of GSEs and, instead, in his search step, proposes the integration of a classifier to a GSE, adding a filtering step to the traditional search process. This simple approach allows that only pages identified as object pages are retrieved by user queries, improving the results for object search. Experiments with real datasets show that OPIS outperforms the baseline with average boost of 47% considering the average precision.

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No. of bitstreams: 1 arquivototal.pdf: 1113682 bytes, checksum: 2a8dacf3d22e347aed3ac29b08cefb2c (MD5) Previous issue date: 2015-02-24 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / The propose of this research was to analyze the reflection of the quality of Corporate Governance on the process of valuation in Brazilian capital market, considering the Ohlson (1995) model. Was resorted to the data of all companies that traded their shares on the BM&FBOVESPA in the period of 2010-2013. For this, a model of valuation was used, which includes a proxy variable for the quality of Corporate Governance, the Index Quality of Corporate Governance (IQGC), based on the agency theory (JENSEN; MECKLING, 1976), which dimensions were included to minimize the agency problems, which were: Composition of the Board of Directors, Ownership Structure and Control Incentive to Directors, Disclosure, Investor Protection, Audit Committee and Asymmetric Information. Among the dimensions Disclosure was the one that had the higher frequency compared to the others companies, however the Audit Committee obtained the lowest frequency. The IQGC was calculated by Principal Component Analysis (PCA), which consists in a weighted average of the principal generated components with the weights given by their respective variances. The analysis on the IQGC behavior, over the analysis period, showed a growth trend in the level of quality of corporate governance on the companies. To assess the relevance of IQGC in the process of valuation has been included in this proxy model residual income valuation (RIV) of Ohlson (1995), business valuation model based on financial variables that allow the inclusion of 'other information' that may represent factors that are important for the valuation, but that have not been reflected by the variables used. The analysis results of the data in balanced panel model also shows that the quality of corporate governance is value relevant in the Brazilian capital market, once that the model had his coefficient of determination increased with the entry of this variable, which was confirmed by the Wald test. In addition to, the intrinsic characteristics of the companies sought to investigate whether the results persist when analyzed: Size and Liquidity. The results revealed that the only evidence remain on medium size companies and among those with lower liquidity, which can be associated to the specific characteristics of Brazilian market. Given the evidence, we can not reject the hypothesis that the quality of Corporate is value relevant for the valuation in the Brazilian capital market. The result of this study are limited to the sample and the period analyzed. / O objetivo desta pesquisa foi analisar o reflexo da qualidade de Governança Corporativa sobre o processo de avaliação de empresas no mercado brasileiro de capitais, considerando o modelo de Ohlson (1995). Recorreu-se aos dados disponíveis de todas as empresas que negociaram suas ações na BM&FBOVESPA no período de 2010 a 2013. Para isso, foi utilizado um modelo de avaliação de empresas com a inclusão de uma variável proxy para a qualidade de Governança Corporativa, o Índice de Qualidade de Governança Corporativa (IQGC), construído com base na Teoria da Agência (JENSEN; MECKLING, 1976), no qual foram compreendidas dimensões destinadas a minimizar os problemas de agência, quais foram: Composição do Conselho de Administração, Estrutura de Propriedade e de Controle, Incentivo aos Administradores, Disclosure, Proteção aos Investidores, Comitê de Auditoria e Assimetria de Informação. Dentre as dimensões, Disclosure foi aquela que obteve maior frequência entre as empresas, por outro lado, a dimensão Comitê de Auditoria obteve menor frequência. O IQGC foi calculado mediante Análise de Componentes Principais (ACP), que consiste em uma média ponderada dos principais componentes gerados, sendo os pesos dados pelas suas respectivas variâncias. A análise do comportamento do IQGC, ao longo do período analisado, revelou uma tendência de crescimento no nível de qualidade da Governança Corporativa das empresas. Para avaliar a relevância do IQGC no processo de avaliação de empresas, foi inserida essa proxy no modelo Residual Income Valuation (RIV) de Ohlson (1995), modelo de avaliação de empresas baseado em variáveis financeiras que permite a inserção de “outras informações” que possam representar fatores que são importantes para a avaliação de empresas, mas que ainda não foram refletidos pelas variáveis usualmente utilizadas. A análise dos resultados do modelo com dados em painel balanceado permitiu inferir que a qualidade de Governança Corporativa é value relevante no mercado brasileiro de capitais, uma vez que o modelo teve o seu coeficiente de determinação acrescido quando da inserção desta variável, o que foi confirmado pelo teste de Wald. De forma adicional, buscou-se investigar se os resultados persistiam quando analisadas as características intrínsecas das empresas: tamanho e liquidez. Os resultados revelaram que as evidências persistem apenas entre as empresas de tamanho médio e entre aquelas de menor liquidez, o que pode estar associado às características específicas do mercado brasileiro. Diante dessas evidências, não se pode rejeitar a hipótese de que a qualidade de Governança Corporativa é value relevant para a avaliação de empresas no mercado brasileiro de capitais. Os resultados obtidos nesse trabalho são limitados à amostra e ao período analisados.

Made available in DSpace on 2015-04-16T14:48:57Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 1565684 bytes, checksum: ba6d2c00fa272d176688486d7e7e7e8c (MD5) Previous issue date: 2012-08-24 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / The area of Information Technology (IT) increased in the last years and consequently the number of academic researches in this area also increased. However, the huge number of production does not assure the quality of the produced papers. Usually the issue quality is discussed due to the irrelevance of these papers, in other words, due to the lack of impact of the research into the practical problems that occur in the organizations and society. It is also verified the lack of tools for effective measurement of researches relevance. In this sense, the main goal of this work is to verify the relevance of the researches developed into Management Science, particularly, in IT area. For this, a questionnaire was created, which is divided into two parts: the first part is based on the classic model of Benbasat and Zmud (1999), which proposes some evaluation dimensions to verify the relevance of researches, focusing on how interesting, actual, applicable and accessible the research is for the IT area; the second part investigates the impact of the IT researches into the academy and organization, through a syncretism test, applied to participants of Enanpad 2011 conference and IT managers of organizations in Paraíba, Pernambuco and Rio Grande do Norte, which tried to measure their knowledge about concepts related to strategic alignment in IT area. The test is structured into ten items, with four levels of difficulty; the scale, which was based on Chan and Reich (2007), Moreno, Cavazzote and Valente (2009), was proposed by the Strategic Alingment Model (SAM) (Henderson e Venkatraman,1993). The issue strategic alignment was chosen because of its relevance for CIO in the last years, which pointed out by Luftman e Ben-Zvi (2010). The results showed two branches of conclusion: the first is the necessity of a restructuration of the current system of production and dissemination of IT research results; the second branch showed that the researchers are unsatisfied with the big quantity of productions and the generalist aspects of these works, which is verified by a huge horizontal production and by the subjectivity involving the main issues discussed. The respondents proposed these two points during the application of the survey; they emphasize the complexity involving the inherent concepts of strategic alignment. The IT managers ask for a succinct and standardized researches aligned with the reality of the organizations. / O campo de tecnologia da informação (TI) cresceu nos últimos anos e sua área acadêmica passou a produzir um maior número de publicações. No entanto, essa grande quantidade de produção acadêmico-científica na área de TI não garante a qualidade dos textos, qualidade muitas vezes contestada devido à irrelevância, ou seja, à baixa incidência ou à ausência de impacto da pesquisa na realidade das organizações e da sociedade. Diante da aparente ausência, na literatura, de instrumentos que mensurem a relevância prática da pesquisa acadêmico-científica em TI, a presente investigação teve como objetivo verificar a relevância das pesquisas acadêmico-científicas em Administração na sub-área de TI. Elaborou-se um questionário dividido em duas partes: a primeira encontra-se fundamentada em modelo clássico de Benbasat e Zmud (1999), adaptado para os fins da presente pesquisa, o qual propõe dimensões para o alcance da relevância na pesquisa acadêmico-científica, focando o quão interessante , atual , aplicável e acessível é a pesquisa acadêmico-científica do campo de TI; e a segunda parte aborda o impacto das pesquisas de TI na academia e nas organizações por meio de um teste de sincretismo que busca medir o conhecimento sobre conceitos de alinhamento estratégico de acadêmicos participantes do Enanpad 2011 e de gestores de TI de empresas de porte médio e grande dos estados da Paraíba, Pernambuco e Rio Grande do Norte, visto que os três estados se destacam no desenvolvimento de tecnologias da informação. O teste encontra-se estruturado em dez questões com quatro níveis de dificuldade, escala determinada pelo acesso e epecificidade, baseado nas referências de Chan e Reich (2007), Moreno, Cavazzote e Valente (2009) e constituído prioritariamente pelo modelo Strategic Alingment Model (SAM) de Henderson e Venkatraman (1993). O tema alinhamento estratégico foi escolhido devido a ser uma das maiores preocupações de executivos de TI nos últimos anos, segundo Luftman e Ben-Zvi (2010). Os resultados revelaram duas vias de conclusão: a primeira é a necessidade de reestruturar o sistema atual de produção e disseminação dos resultados da pesquisas acadêmico-científicas da área de TI, e a segunda via demonstra que os próprios desenvolvedores das pesquisas (os acadêmicos) estão insatisfeitos com o volume de produção e o caráter generalista de suas pesquisas, visto que há uma imensa produção horizontalizada e subjetiva que envolve o campo de TI. Essas alegações foram postas durante a aplicação do questionário pelos respondentes, que defenderam a dificuldade em dominar boa parte do conteúdo que envolve o alinhamento estratégico. Já os gestores de TI defenderam uma pesquisa mais próxima da realidade, mas prioritariamente sucinta e padronizada.

Submitted by Kilvya Braga (kilvyabraga@hotmail.com) on 2018-05-14T13:17:14Z No. of bitstreams: 1 JÚLIO HENRIQUE ROCHA - DISSERTAÇÃO (PPGCC) 2016.pdf: 3692650 bytes, checksum: 97151b25e0e73635f40106266ca79e2e (MD5) / Made available in DSpace on 2018-05-14T13:17:14Z (GMT). No. of bitstreams: 1 JÚLIO HENRIQUE ROCHA - DISSERTAÇÃO (PPGCC) 2016.pdf: 3692650 bytes, checksum: 97151b25e0e73635f40106266ca79e2e (MD5) Previous issue date: 2016 / Capes / Recuperação de Informação Geográfica (GIR) é uma área de pesquisa que desenvolve e viabiliza a construção de mecanismos de busca por conteúdos distribuídos pela Internet envolvendo algum contexto geográfico. Os motores de busca geográfica, que são artefatos produzidos na área de GIR, podem ser especificados para trabalhar em diversos contextos (e.g., esportes, concursos públicos), buscando um tratamento adequado ao tipo de documento manipulado. Atualmente, a comunidade científica e o meio comercial vêm concentrando esforços na construção de motores de busca geográfica com o foco em encontrar notícias distribuídas na Internet. Contudo, motores de busca (geográfica ou não) com foco em notícias, deveriam considerar o fator de credibilidade da informação contida nas mesmas no momento de ordená-las. Infelizmente, na maior parte das vezes, isso não acontece. Mensurar a credibilidade de notícias é uma atividade onerosa e complexa, por exigir o conhecimento dos fatos relatados. Dessa forma, os motores de busca acabam deixando a cargo do usuário a responsabilidade em confiar no que está sendo lido. Nesse contexto, esta dissertação propõe um método de ranking de relevância com foco em notícias e baseado em informações colhidas em redes sociais, para valorar um grau de credibilidade e, assim, ordená-las. O valor de credibilidade da notícia é calculado considerando a afinidade dos usuários, que a compartilharam em sua rede social, com as localidades mencionadas na notícia. Por fim, o ranking de relevância proposto é integrado a uma ferramenta de busca e leitura de notícias, denominada GeoSEn News, que viabiliza a consulta por meio de diversas operações espaciais e permite a visualização dos resultados em diferentes perspectivas. Tal ferramenta foi utilizada para avaliar o método proposto através de experimentos utilizando dados colhidos na rede social Twitter e em mídias informativas espalhadas pelo Brasil. A avaliação apresentou resultados promissores e atestou a viabilidade da construção do ranking de relevância que se baseia em informações coletadas em redes sociais. / Geographic Information Retrieval is a research field that develops and allows the construction of search engines to retrieve information with geographic context that is available on the Internet. Produced in the GIR field, geographic search engines can be specified to work in many different contexts (e.g., as sports, concerts), seeking proper ways to handle the chosen document type. Nowadays, the scientific community and the commerce are focusing efforts on building geographic search engines to find news over the Internet. However, search engines (geographical or otherwise) focused on news should consider the information credibility factor in the moment of ranking them. Unfortunately, in most cases, it is not what happens. Measure the news credibility is a complex and expensive task since it requires knowledge of the stated facts. Thereby, search engines end up giving the user the responsibility to trust or not what is being read. In this context, this work proposes a relevance ranking method focused in news and based on information collected from social networks, to evaluate a credibility factor and thus, rank them. The news credibility value is calculated considering the affinity of users who have shared it on their social network with the locations mentioned in the news. Lastly, the proposed relevance ranking is integrated with a search engine and reading news tool called GeoSEn News, which enables various spatial operations queries and allows result visualization in different perspectives. Through experiments using data collected in the social network Twitter and informational media throughout Brazil, this tool was used to evaluate the proposed method. The evaluation presented promising results and certified the feasibility of building relevance ranking based on information collected from social networks.