Performance analysis of 4G wireless networks using system level simulator

In the last decade, mobile wireless communications have witnessed an explosive growth in the user’s penetration rate and their widespread deployment around the globe. In particular, a research topic of particular relevance in telecommunications nowadays is related to the design and implementation of mobile communication systems of 4th generation (4G). 4G networks will be characterized by the support of multiple radio access technologies in a core network fully compliant with the Internet Protocol (all IP paradigms). Such networks will sustain the stringent quality of service (QoS) requirements and the expected high data rates from the type of multimedia applications (i.e. YouTube and Skype) to be available in the near future. Therefore, 4G wireless communications system will be of paramount importance on the development of the information society in the near future. As 4G wireless services will continue to increase, this will put more and more pressure on the spectrum availability. There is a worldwide recognition that methods of spectrum managements have reached their limit and are no longer optimal, therefore new paradigms must be sought. Studies show that most of the assigned spectrum is under-utilized, thus the problem in most cases is inefficient spectrum management rather spectrum shortage. There are currently trends towards a more liberalized approach of spectrum management, which are tightly linked to what is commonly termed as Cognitive Radio (CR). Furthermore, conventional deployment of 4G wireless systems (one BS in cell and mobile deploy around it) are known to have problems in providing fairness (users closer to the BS are more benefited relatively to the cell edge users) and in covering some zones affected by shadowing, therefore the use of relays has been proposed as a solution. To evaluate and analyse the performances of 4G wireless systems software tools are normally used. Software tools have become more and more mature in recent years and their need to provide a high level evaluation of proposed algorithms and protocols is now more important. The system level simulation (SLS) tools provide a fundamental and flexible way to test all the envisioned algorithms and protocols under realistic conditions, without the need to deal with the problems of live networks or reduced scope prototypes. Furthermore, the tools allow network designers a rapid collection of a wide range of performance metrics that are useful for the analysis and optimization of different algorithms. This dissertation proposes the design and implementation of conventional system level simulator (SLS), which afterwards enhances for the 4G wireless technologies namely cognitive Radios (IEEE802.22) and Relays (IEEE802.16j). SLS is then used for the analysis of proposed algorithms and protocols.

O quadro interativo na aula de inglês : desenvolvimento de práticas comunicativas

Na sociedade da informação, o papel da escola como centro transmissor de conhecimentos está a perder relevância face ao crescente número de fontes de informação alternativas, ricas em conteúdos e de fácil acesso. A alteração de paradigmas cria a necessidade de se introduzirem nos contextos educacionais novas ferramentas e que se adequem estratégias que permitam motivar e ensinar os aprendentes a procurarem e a selecionarem essa informação, participando, desta forma, ativamente na construção do conhecimento. Neste contexto, consideramos que o quadro interativo, pela sua capacidade de funcionar como hub digital, permite integrar recursos dinâmicos e interativos facilitadores do acesso ao conhecimento e à informação. A dissertação que apresentamos, “O Quadro Interativo na aula de inglês: desenvolvimento de práticas comunicativas”, situa-se na área do Multimédia em Educação e, mais especificamente, no domínio da tecnologia e pedagogia em sala de aula. A investigação foi desenhada em torno de um projeto de implementação de quadros interativos (Inov@r com QI) em agrupamentos/escolas do interior do país, associado a um Centro de Formação. A partir de uma investigação qualitativa mista, baseada no tracer study (análise documental, entrevistas e questionários) e no estudo etnográfico (aulas observadas, entrevistas e questionários), procurámos evidenciar a forma como essa tecnologia levou à integração de recursos e à adoção de estratégias promotoras de um ensino e aprendizagem ativo, centrado no aprendente e criando dinâmicas de interação e comunicação facilitadoras do desenvolvimento da competência comunicativa. Os resultados obtidos revelam que a introdução do quadro interativo produz efeitos positivos no ensino e aprendizagem do inglês. A sua integração em contexto de sala de aula abre espaço a um conjunto de potencialidades pedagógicas, promove o uso de recursos digitais variados; leva a uma diversificação de abordagens metodológicas que promovem a interação, criando espaços que levam ao desenvolvimento da competência comunicativa. No entanto, para tornar a introdução do quadro interativo mais eficaz, como ferramenta educativa no processo de ensino e aprendizagem, devemos ter em conta que esse processo de introdução do quadro deve ser planeada e refletida, devendo ter em conta uma nova realidade de conceitos, a tecnologia e as literacias necessárias para uma implementação eficaz. Os docentes devem ser acompanhados, ter acesso a formação técnica e pedagógica; e a possibilidade de integrarem um espaço de colaboração e partilha, como forma mais eficaz de se libertarem de práticas centradas no docente e orientadas apenas para a aquisição de conteúdos. Assim será possível dar lugar a um discurso pedagógico que inclua os vários intervenientes no processo de aprendizagem e a construção de conhecimento, num espaço de interação suportado pela tecnologia

Avaliação em contextos de blended learning no ensino superior

The increasing complexity of the Information Society and the Bologna Declaration in the European context has led Higher Education (HE) institutions to revise their curricula courses, as far as the adoption of new strategies for teaching and learning as well as evaluation are concerned. It can also be emphasized that there has been a growing use of eLearning and of blended learning (bLearning) in HE, since these modes of training seem to be a very convenient option for lifelong learning. In this context, quality is taken as an essential goal in the development of the European Space for Education and Training, where HE institutions compete among themselves, and where evaluation is determinant as a promoter of this quality. Considering the problems summarized above, the research developed, based on four published scientific papers, intended to answer a set of research questions related to evaluation of bLearning contexts in HE. The study used diverse techniques and instruments (questionnaires, document analysis, and observation mediated technologies) spanning two methodological approaches: i) study of descriptive and exploratory nature and ii) case studies of bLearning modules. In the first approach an evaluation model for bLearning courses was developed, where we collected and analyzed, at a national level, the opinions of teachers with bLearning experience about the model dimensions. The case studies presented are post graduation curricular units, where bLearning teaching, learning and evaluation strategies were explored and evaluated, namely peer assessment. The main contributions of the first approach are: the process of questioning around the evaluation of bLearning courses, namely the quality assurance criteria for bLearning, as well as the model developed, providing a framework of theoretical, methodological and empirical elements that can be adapted in similar contexts. From the case studies emerged: the developed evaluation guidelines and the data collection instruments, in order to disseminate evaluation “best practices” that may be useful for other units in similar contexts. Regarding the recommendations about the evaluation of teaching of bLearning courses we emphasize: the use of versatile evaluation objects; the evaluation throughout the process and not just at the end; and the involvement of multiple evaluators, including students (whose feedback is essential to monitor the quality of teaching and learning). From the case studies we highlight: the need for discussion of evaluation frameworks to explore, and consequent increase in the transparency of the evaluation process; the increased interaction between groups; and the peer assessment as a strategy to promote active and autonomous learning. In addition to the contributions and recommendations for practice and research in the area of evaluation in bLearning contexts in HE, listed above, it also emerged from this study useful guidelines regarding educational evaluation in bLearning contexts, in order to improve the quality of teaching, learning and evaluation in such contexts.

Framework for the characterization of hotel websites

Nowadays the importance of websites to the tourism and hospitality industries is fundamental. Hotels, for instance, spend a huge amount of money improving their websites to show all the activities and amenities that they can provide. There are studies to evaluate website performance based on functionality, usability and other factors; nevertheless, they are not exhaustive. This paper presents a framework for the characterization of hotel and resort websites, that was applied as a case study to the websites of 5-star hotels and resorts that operate in the tourism region of the Algarve, Portugal. This framework allows us to identify a set of features for the hotel and resort websites characterization. From these features, we propose a set of comprehensive indicators, grouping them into ten fundamental information dimensions, as well as the application of these indicators and information dimensions, which allows obtaining quantitative and qualitative results.

As tecnologias de informação e comunicação juntamente com o fórum na promoção da formação contínua de professores

Trabalho de projecto de mestrado, Ciências da Educação (Formação de Professores), Universidade de Lisboa, Instituto de Educação, 2011

Divulgação online da religião católica - estudo de caso: análise do website da Diocese do Porto

Dissertação de Mestrado apresentada ao Instituto Superior de Contabilidade e Administração do Porto para a obtenção do grau de Mestre em Marketing Digital, sob orientação de Mestre António da Silva Vieira

Informação e conhecimento: fluxos e apropriação sob uma abordagem crítica

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Contrastive terminology: semitic, anglo-germanic and latin concept building through complex terms. (avoiding one-way method procedures in translation

This paper aims to present a contrastive approach between three different ways of building concepts after proving the similar syntactic possibilities that coexist in terms. However, from the semantic point of view we can see that each language family has a different distribution in meaning. But the most important point we try to show is that the differences found in the psychological process when communicating concepts should guide the translator and the terminologist in the target text production and the terminology planning process. Differences between languages in the information transmission process are due to the different roles the different types of knowledge play. We distinguish here the analytic-descriptive knowledge and the analogical knowledge among others. We also state that none of them is the best when determining the correctness of a term, but there has to be adequacy criteria in the selection process. This concept building or term building success is important when looking at the linguistic map of the information society.

Literacia de informação na Polícia de Segurança Pública

Orientadora: Doutora Anabela Mesquita Teixeira Sarmento

Um estudo sobre as preferências dos consumidores em mercados digitais e tradicionais

Dissertação de Mestrado apresentada ao Instituto Superior de Contabilidade e Administração do Porto para a obtenção do grau de Mestre em Marketing Digital, sob orientação do Mestre Paulo Gonçalves

Digital Divide Across the European Union

Dissertação apresentada como requisito parcial para obtenção do grau de Mestre em Estatística e Gestão de Informação

O âmbito de aplicação material da legislação de proteção de dados pessoais e o tratamento de imagem por pessoa singular

Images have gained a never before seen importance. Technological changes have given the Information Society extraordinary means to capture, treat and transmit images, wheter your own or those of others, with or without a commercial purpose, with no boundaries of time or country, without “any kind of eraser”. From the several different ways natural persons may engage in image processing with no commercial purpose, the cases of sharing pictures through social networks and video surveillance assume particular relevance. Consequently there are growing legitimate concerns with the protection of one's image, since its processing may sometimes generate situations of privacy invasion or put at risk other fundamental rights. With this in mind, the present thesis arises from the question: what are the existent legal instruments in Portuguese Law that enable citizens to protect themselves from the abusive usage of their own pictures, whether because that image have been captured by a smartphone or some video surveillance camera, whether because it was massively shared through a blog or some social network? There is no question the one's right to not having his or her image used in an abusive way is protected by the Portuguese constitution, through the article 26th CRP, as well as personally right, under the article 79th of the Civil Code, and finally through criminal law, articles 192nd and 193rd of the Criminal Code. The question arises in the personal data protection context, considering that one's picture, given certain conditions, is personal data. Both the Directive 95/46/CE dated from 1995 as well as the LPD from 1998 are applicable to the processing of personal data, but both exclude situations of natural persons doing so in the pursuit of activities strictly personal or family-related. These laws demand complex procedures to natural persons, such as the preemptive formal authorisation request to the Data Protection National Commission. Failing to do so a natural person may result in the application of fines as high as €2.500,00 or even criminal charges. Consequently, the present thesis aims to study if the image processing with no commercial purposes by a natural person in the context of social networks or through video surveillance belongs to the domain of the existent personal data protection law. To that effect, it was made general considerations regarding the concept of video surveillance, what is its regimen, in a way that it may be distinguishable from Steve Mann's definition of sousveillance, and what are the associated obligations in order to better understand the concept's essence. The application of the existent laws on personal data protection to images processing by natural persons has been analysed taking into account the Directive 95/46/CE, the LPD and the General Regulation. From this analysis it is concluded that the regimen from 1995 to 1998 is out of touch with reality creating an absence of legal shielding in the personal data protection law, a flaw that doesn't exist because compensated by the right to image as a right to personality, that anyway reveals the inability of the Portuguese legislator to face the new technological challenges. It is urgent to legislate. A contrary interpretation will evidence the unconstitutionality of several rules on the LPD due to the obligations natural persons are bound to that violate the right to the freedom of speech and information, which would be inadequate and disproportionate. Considering the recently approved General Regulation and in the case it becomes the final version, the use for natural person of video surveillance of private spaces, Google Glass (in public and private places) and other similar gadgets used to recreational purposes, as well as social networks are subject to its regulation only if the images are shared without limits or existing commercial purposes. Video surveillance of public spaces in all situations is subject to General Regulation provisions.

Le droit de distribution électronique : essai sur le droit de distribution des oeuvres en droit d'auteur canadien, américain, anglais et français

"Thèse présentée à la Faculté des études supérieures en vue de l'obtention du grade de docteur en droit"

Internet et la liberté d'expression : l'exemple des critiques dirigées contre les oligopoles

"Mémoire présenté à la Faculté des études supérieures en vue de l'obtention du grade de maîtrise en droit option droit des technologies de l'information"

Les missions des bibliothèques publiques autonomes du point de vue des élus municipaux québécois

La légitimité d’une organisation est fondée sur sa mission, c’est-à-dire sur sa raison d’être. Des responsables des bibliothèques et de nombreux chercheurs craignent que la légitimité des bibliothèques publiques soit contestée dans la société de l’information. De plus, les textes officiels présentant les missions des bibliothèques publiques sont divers et les missions y sont délibérément non définies. Au Québec, où une grande majorité des bibliothèques publiques autonomes sont placées directement sous la tutelle des municipalités, les bibliothèques publiques doivent définir et légitimer leurs missions avec les élus municipaux. L’objectif principal de cette recherche est de comprendre, via les discours, le point de vue des élus municipaux québécois sur les missions des bibliothèques publiques autonomes, en comparaison avec les pratiques et les ressources des bibliothèques au plan local. Basé sur la théorie de la construction sociale de la réalité, un cadre conceptuel est proposé de manière à étudier non seulement les discours dans leur dimension textuelle, mais aussi à contextualiser ces discours et analyser l’écart entre ces discours et les pratiques des bibliothèques.La stratégie de recherche adoptée est une étude de cas multiples. L’objectif est de développer une analyse en profondeur de chaque cas et une analyse inter cas. Les douze cas (municipalités) ont été sélectionnés en fonction de deux critères de variation (la taille de la municipalité et le budget annuel alloué par la municipalité à la bibliothèque) et un critère discriminant (la distance par rapport à l’Université de Montréal). Des entrevues ont été menées auprès des élus municipaux présidant la commission ou le comité dont dépendent les bibliothèques publiques. Ces entrevues et les politiques culturelles ont fait l’objet d’une analyse de discours. Les entrevues auprès des responsables des bibliothèques et la documentation ont fait l’objet d’une analyse de contenu. Ces analyses ont permis la triangulation des méthodes et des sources de données.Les élus municipaux québécois, comme les professionnels, n’offrent pas un discours homogène sur les missions des bibliothèques publiques. Toutefois, un modèle de discours émerge. Il montre un discours « limité » par rapport à la littérature, dans lequel une image passive de la bibliothèque est présentée et dans lequel la tradition perdure malgré le contexte de la société de l’information. Mais l’analyse révèle aussi que les élus municipaux construisent leurs points de vue sur leurs propres convictions en tant qu’individus, sur leur rôle dans la gestion de la municipalité en tant qu’élus et sur l’image qu’ils ont des usagers des bibliothèques publiques. Enfin, l’analyse a révélé un axe de différenciation des points de vue selon que le discours s’appuie sur des valeurs fondamentales ou sur les usages (réels ou supposés) de la bibliothèque.