Many protection mechanisms in computer security are designed to enforce a configurable policy. The security policy captures high-level goals and intentions, and is managed by a policy author tasked with translating these goals into an implementable policy. In our work, we focus on access control policies where errors in the specified policy can result in the mechanism incorrectly denying a request to access a resource, or incorrectly allowing access to a resource that they should not have access to. Due to the need for correct policies, it is critical that organizations and individuals have usable tools to manage security policies. Policy management encompasses several subtasks including specifying the initial security policy, modifying an existing policy, and comprehending the effective policy. The policy author must understand the configurable options well enough to accurately translate the desired policy into the implemented policy. Specifying correct security policies is known to be a difficult task, and prior work has contributed policy authoring tools that are more usable than the prior art and other work has also shown the importance of the policy author being able to quickly understand the effective policy. Specifying a correct policy is difficult enough for technical users, and now, increasingly, end-users are being asked to make access control decisions in regard to who can access their personal data. We focus on the need for an access control mechanism that is usable for end-users. We investigated end-users who are already managing an access control policy, namely social network site (SNS) users. We first looked at how they manage the access control policy that defines who can access their shared content. We accomplish this by empirically evaluating how Facebook users utilize the available privacy controls to implement an access control policy for their shared content and found that many users have policies are inconsistent with their sharing intentions. Upon discovering that many participants claim they will not take corrective action in response to inconsistencies in their existing settings, we collected quantitative and qualitative data to measure whether SNS users are concerned with the accessibility of their shared content. After confirming that users do in fact care about who accesses their content, we hypothesize that we can increase the correctness of users' SNS privacy settings by introducing contextual information and specific guidance based on their preferences. We found that the combination of viewership feedback, a sequence of direct questions to audit the user's sharing preferences, and specific guidance motivates some users to modify their privacy settings to more closely approximate their desired settings. Our results demonstrate the weaknesses of ACL-based access control mechanisms, and also provide support that it is possible to improve the usability of such mechanisms. We conclude by outlining the implications of our results for the design of a usable access control mechanism for end-users.

This research is about practising friendship as a Christian in contemporary contexts. The thesis uses methods of practical theology, explained in the first chapter, to explore three practices that are important to many young adult Christians: Facebook, friendship and faith. In Chapter 2 we attend to descriptions of Facebook and friendship practices of young adult Christians based on qualitative research conducted through fieldwork. Models are developed to organize assumptions and values of the participants and provide a framework for analysis. In Chapter 3 the practices are placed in the context of wider social/cultural dimensions in order to recognize ways the young people involved in the fieldwork are following culture and where they are being counter-cultural. In Chapter 4 we view what are interpreted as value-laden practices alongside various theologies of friendship. In the fifth chapter the social/cultural aspects of friendship practices encounter and engage with the theological perspectives. The analysis is based on an understanding of the relationship between faith practices and the ‘wider culture' that has been established by the preceding chapters. The final stage of an initial iteration of the practical theology cycle is implementation of reformed practices, illustrated by examples and conclusions in Chapter 6. This application of the practical theology cycle raises consciousness of the need for connection of personal practices and becomes a catalyst for a continuous cycle of examining and reflecting on experiences, contexts, and faith perspectives. The theological voice of young adult Christians is heard and valued in realizing friendship as a means of fulfilling a call in Christ.

The main objective of this thesis is to evaluate activities of the bar U stare studny on social networks and to suggest steps that will enable management to achieve success mainly on Facebook, but also on other networks such as Twitter and Foursquare. The bar is currently using social networks in a very limited way and in this work I would like to contribute to better understanding of the problem and also show the way, which should their online activities take. The theoretical part deals with the social graph, which is later linked to the modern online social networks. The practical part contains steps that aim to improve the marketing campaigns primarily on Facebook, but also on Twitter and Foursquare.

The thesis deals in the first part with the definition of social networks, their historical development and the basic principles of the operation. The content of the second part is focused on the benefits and risks connected to the usage of the social networks and contains the analysis of trends in the marketing practice. The next part is devoted to the most used social networks and describes their functional elements, which can be used by the companies to achieve their marketing objectives. The practical part of this thesis begins with the introduction of the company IBM, their marketing strategy and evaluation of the activities within social networks. The main objective of this thesis is to propose steps that will help IBM to avoid the mistakes which are currently being made. These steps include mainly the layout design and the usage of the most frequently used functionalities to allow more effective utilization of the social networks in marketing strategy. Although is Facebook the key element for the application of the proposed steps, the attention is also devoted to Twitter and the newly established social network called Google+.

Title: Utilization of Facebook in studio Arven's marketing Objectives: The aim of this work is to create a facebook fan page for Power Plate studio Arven in Čelákovice. The facebook fan page was created on the basis of survey. Then the effectiveness of the page was evaluated. Methods: In this work have been taken both quantitative and qualitative methods. The quantitative method was applied in survey among existing clients of studio Arven and facebook fans of fitness clubs. Qualitative method was used during structured interviews. The facebook page was monitored. Results: It was found that the facebook page serves as a presentation for companies. However, fans of the facebook pages do not follow the pages very often. It was also found that is very difficult to bring new clients to the studio thanks to Facebook. Keywords: marketing, marketing communications, social networks, Facebook

Submitted by PPG Comunica??o Social (famecos-pg@pucrs.br) on 2018-08-06T11:00:22Z No. of bitstreams: 1 RAFAELA_CHIAPIN_PECHANSKY_DIS.pdf: 3144167 bytes, checksum: f4fbe242935951e88c596248e5693835 (MD5) / Rejected by Sheila Dias (sheila.dias@pucrs.br), reason: Devolvido devido ? falta da capa institucional e na folha de rosto falta nome do orientador, no arquivo PDF. on 2018-08-07T12:17:16Z (GMT) / Submitted by PPG Comunica??o Social (famecos-pg@pucrs.br) on 2018-08-13T11:32:36Z No. of bitstreams: 1 RAFAELA_CHIAPIN_PECHANSKY_DIS.pdf: 3490414 bytes, checksum: cf0e6655d061531b23c11f764232fc80 (MD5) / Approved for entry into archive by Sheila Dias (sheila.dias@pucrs.br) on 2018-08-13T13:03:24Z (GMT) No. of bitstreams: 1 RAFAELA_CHIAPIN_PECHANSKY_DIS.pdf: 3490414 bytes, checksum: cf0e6655d061531b23c11f764232fc80 (MD5) / Made available in DSpace on 2018-08-13T13:21:19Z (GMT). No. of bitstreams: 1 RAFAELA_CHIAPIN_PECHANSKY_DIS.pdf: 3490414 bytes, checksum: cf0e6655d061531b23c11f764232fc80 (MD5) Previous issue date: 2018-04-27 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / This work aims to understand how the concept of alterity is being ressignified through the digital environment in the contemporary world. The subject of this research is the page Humans of New York. The selected corpus for interpretation (collected throughout 2016 and 2017 and made by 20 posts) is focused on (1) posts that frame immigrants and (2) public manifestations through likes/reactions and comments. For contextualization, a few concepts are discussed, such as internet, social networks, algorithms and filter bubbles. The theme of otherness, then, is placed in perspective, among concepts just as identity, hospitality and anthropology of emotions. The method used is Deep Hermeneuthics, of Thompson, combined with digital methods. The data found indicates that people are conditioned to digital features at the same time as they appropriate a new environment, which impacts fundamentally the way we relate to the Other. / Este trabalho objetiva compreender de que forma o conceito de alteridade est? sendo ressignificado a partir do ambiente digital no mundo contempor?neo. O objeto da pesquisa ? a p?gina Humans of New York. O corpus (selecionado durante 2016 e 2017 e composto por 20 posts) selecionado para a interpreta??o ? delimitado em (1) posts que retratam imigrantes e (2) manifesta??es do p?blico a partir de curtidas/rea??es e coment?rios. Para contextualizar a pesquisa, discutem-se temas como internet, redes sociais, algoritmos e bolhas de filtro. Em seguida, ? colocado em perspectiva o tema da alteridade junto a conceitos como identidade, hospitalidade e antropologia das emo??es. O m?todo empregado ? a Hermen?utica de Profundidade, de Thompson, aliada aos m?todos digitais. Os dados encontrados denotam que as pessoas s?o condicionadas ?s ferramentas digitais ao mesmo tempo em que se apropriam de um novo ambiente, o que impacta fundamentalmente a maneira como nos relacionamos com o Outro.

Submitted by Cristiane Chim (cristiane.chim@ucpel.edu.br) on 2017-11-10T11:09:34Z No. of bitstreams: 1 Natália Radtke.pdf: 1900604 bytes, checksum: 56f2503ede2f5442a6127b009fa10ba0 (MD5) / Made available in DSpace on 2017-11-10T11:09:34Z (GMT). No. of bitstreams: 1 Natália Radtke.pdf: 1900604 bytes, checksum: 56f2503ede2f5442a6127b009fa10ba0 (MD5) Previous issue date: 2017-03-08 / Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq# / #-2555911436985713659# / #600 / This study analyses occurrences of linguistic discrimination in six posts taken from the page “Português da Depressão”(Portuguese of Depression in english), hosted on the website of the social network Facebook. To that end, concepts are used that try to characterize the space online and the details that cover this social network, trying to perceive the effects of meaning in the online language in the interactions that occur between the social network users. The study delivers a theoretical background that pursues outlining and offering a historical overview about the internet and the online sociability regarding the concept of territorynetwork. After that, a brief presentation of the internet slang is made correlating it to the linguistic discrimination, to subsequently approach a discursive and ideological bias on this phenomenon. For this purpose, the CMDA has been used, a methodology that proposes to study the online discursive phenomena. In the analyzes made, it was possible to confirm the hypothesis that the linguistic discrimination is accompanied by other social values. The low linguistic performance, for example, is correlated to a low intellectual level, and the discourses loaded with sarcasm and humor end up naturalizing and perpetuating the linguistic discrimination in the virtual environment. / O presente estudo analisa ocorrências de preconceito linguístico em seis publicações retiradas da página “Português da Depressão”, hospedada no site de rede social Facebook. Para tal, são utilizados conceitos que buscam caracterizar o espaço online e as particularidades que abrangem essa rede social, buscando observar nas interações que ocorrem entre usuários da rede os efeitos de sentido no uso da linguagem online. O estudo apresenta um embasamento teórico que busca delinear e oferecer um panorama histórico acerca da internet e a socialidade online relacionado com o conceito de território-rede. Em seguida é feita uma breve apresentação do internetês correlacionando-o com o preconceito linguístico, para posteriormente ser abordado um viés discursivo e ideológico sobre este fenômeno. Para tanto foi utilizada a CMDA, uma metodologia que se propõe a estudar fenômenos discursivos online. Nas análises feitas, foi possível confirmar a hipótese de que o preconceito linguístico vem acompanhado de outros valores sociais. O baixo desempenho linguístico, por exemplo, é correlacionado a um baixo nível intelectual e os Discursos carregados de sarcasmo e humor acabam por naturalizar e perpetuar o preconceito linguístico no ambiente virtual.

Dissertação (mestrado)—Universidade de Brasília, Faculdade de Educação Física, Programa de Pós-Graduação Strictu-Sensu em Educação Física, 2015. / Este trabalho vincula-se à linha de pesquisa: Estudos Sociais e Pedagógicos da Educação Física, Esporte e Lazer com Tema em: Mídias, Educação e Educação Física do Programa de Mestrado/Doutorado em Educação Física da Universidade de Brasília. A problemática emergida a partir de nossa prática pedagógica e leituras sobre Mídia e Corpo investigou a seguinte questão: qual a influência das redes sociais online, especificamente o Facebook, nas representações sociais de corpo na perspectiva de professores graduados em Educação Física? Tivemos como objetivos: a) Analisar representações sociais de corpo de professores graduados em Educação Física usuários da rede social online Facebook; b) Identificar aspectos das redes sociais online enquanto elementos da mídia que influenciam nas representações sociais sobre o corpo de professores de Educação Física; c) Verificar quais são as informações sobre o corpo veiculadas nas redes sociais online dos professores. A partir dos avanços tecnológicos e das interações humanas ocorridas através do uso dessas tecnologias podemos “observar” representações sociais conforme aponta Moscovici (2003). Levantamos como hipótese nesta pesquisa a possibilidade das representações sociais de corpo dos professores de Educação Física usuários de redes sociais online, especificamente o Facebook, sofrerem influências da mídia enquanto meio social ao qual estão inseridos. Este estudo parte de uma pesquisa qualitativa e descritiva onde os instrumentos para coleta de dados foram uma tarefa de evocação de palavras para identificarmos as representações sociais de corpo dos professores e também utilizamos um questionário online elaborado na plataforma da SURVEY MONKEY composto por questões semiestruturadas baseadas em um roteiro mínimo onde o entrevistado teve a possibilidade de discorrer de forma livre espontânea sobre o tema em questão sem se prender à indagação formulada que de acordo com Rangel (2004) é a condição favorável ao estudo das representações sociais. Na análise dos dados o pressuposto metodológico que norteou a pesquisa foi o processo indutivo-interpretativo que, de acordo com Kipnis (2004) contribui para descrever simultaneamente vários fatores que compõem nossa realidade, buscando uma contextualização, compreensão e interpretação do fenômeno estudado, onde o pesquisador parte de observações mais livres, deixando que dimensões e categorias de interesse emerjam progressivamente durante o processo de coleta, análise e discussão dos dados. Para a análise dos dados foram estabelecidas e aplicadas categorias para classificar a variedade de representações apontadas pelos professores utilizando a análise de conteúdo de Bardin (2011) enquanto um conjunto de técnicas de análise das comunicações que visa obter por meio de instrumentos sistemáticos o conteúdo das mensagens e os indicadores que permitam a inferência de conhecimentos relativos às condições de produção e recepção das mensagens. Os resultados indicaram que o Facebook enquanto rede social e elemento da mídia através de imagens de corpos malhados, “curtidos”, “comentados” e “compartilhados” é capaz de influenciar nas representações de corpo de determinados indivíduos e que as representações sociais desses professores estão intimamente relacionadas ao elemento “saúde”, que por sua vez corresponde ao seu núcleo central e de modo secundário como núcleo periférico encontram-se as palavras “movimento, beleza, estética e vida” que também evidenciam relação com o núcleo central. / This work is linked to the line of research: Social Studies and Pedagogical Physical Education, Sport and Recreation with Theme in: Media, Education and Physical Education of the Masters / PhD in Physical Education from the University of Brasilia. The issue emerged from our pedagogical practice and readings on Media and Body investigated the question: what is the influence of online social networks, specifically Facebook, the body of social representations from the perspective of graduate teachers in physical education? We had the following objectives: a) analyze social representations of the body of graduate teachers in Physical Education users online social network Facebook; b) identify aspects of online social networks as media elements that influence the social representations of the body of physical education teachers; c) Check what information on the body conveyed in online social networks of teachers. From the technological advances and human interactions that occur through the use of these technologies can "observe" social representations as shown by Moscovici (2003). We raised the hypothesis in this study the possibility of social representations of the body of PE teachers online social network users, specifically Facebook, suffer media influences while social environment to which they are inserted. This study is a qualitative and descriptive research where the instruments for data collection were a word recall task to identify the body of social representations of teachers and also used an online questionnaire prepared in the SURVEY MONKEY platform composed of semi-structured questions based on a minimum script where the respondent was able to work out of spontaneous freely on the subject in question without being attached to the formulated question that according to Rangel (2004) is the favorable condition to the study of social representations. In analyzing the data the methodological assumption that guided the research was the inductive-interpretive process that, according to Kipnis (2004) contributes to describe simultaneously several factors that make up our reality, seeking a context, understanding and interpretation of the phenomenon studied, where the researcher part of freer observations, letting dimensions and categories of interest progressively emerge during the process of collection, analysis and discussion of the data. For the analysis of the data were established and applied categories to classify the variety of representations pointed out by teachers using the Bardin content analysis (2011) as a set of analysis techniques of communication that seeks through systematic instruments the content of messages and the indicators that allow the inference of knowledge related to the conditions of production and reception of messages. The results indicated that Facebook as a social network and media element through bodies spotted images, "tanned", "Reviewed" and "shared" can influence the body representations of certain individuals and that social representations of these teachers are closely related to the "health" element, which in turn corresponds to its central and secondarily core and peripheral core are the words "movement, beauty, aesthetics and life" that also show relationship to the core.

Tese de mestrado integrado. Engenharia Electrotécnica e de Computadores. Universidade do Porto. Faculdade de Engenharia. 2011

Tese de mestrado integrado. Engenharia Informática e Computação. Faculdade de Engenharia. Universidade do Porto. 2011