This dissertation contributes to a methodology and a better understanding that can be used to study the effects of strategies during a pandemic, especially in multi-community networks. The dissertation is structured as the following: In the first chapter, we introduce the concept of networks and its properties, and node and link percolation, which is an important process embedded in networks. Then we discuss different epidemic models, among which the SIR model is representative of many infectious diseases, and can also be mapped into a link percolation problem. We bring up two quantities that are most important in evaluating the effectiveness of epidemic strategies, one is the total fraction of individuals ever been infected by the final steady state of the SIR model, the other is the peak fraction of infected throughout the process, the second of which has seldom been studied before. There have been many researches on epidemic models within isolated networks, but recently people start getting more interested in network of networks, due to its better representation of real world systems. So we study those two quantities and their dependence on the fraction of bridge nodes in multi-community networks, in the second and third chapters: In the second chapter, we look at the final steady state of the SIR (Susceptible-Infected-Recovered) model, which can be mapped as one cluster in a link percolation problem. Using the scaling relations for the cluster size distributions around the critical point within isolated networks, we find multiple regimes in a network with two communities so that the total fraction of individuals ever been infected asymptotically follows different power laws with the fraction of bridge nodes within each regime. We also find crossovers between neighbor regimes so that the power law exponent changes from one regime to the other. It is interesting to note that the power-law relations get steeper in regimes with smaller transmissibilities, so those epidemic strategies that reduce connections between communities are more effective in those regimes. In the third chapter, we look at the peak fraction of infected of the SIR model, which also shows power law relations with the fraction of bridge nodes in different regimes, as well as crossovers between regimes. We also find that the power-law relation for the peak fraction of infected with the fraction of bridge nodes is steeper than the one for the total fraction of individuals ever been infected in the same regime, which indicates that the peak fraction of infected is more sensitive to strategies that reduce connections between communities. This explains why strategies to flatten the curve are usually taken when there are limited medical resources.

The Blacksburg Electronic Village (BEV) project was established as a partnership between C&P Telephone of Virginia, Virginia Tech, and the town of Blacksburg. In this thesis, I describe the formation of this partnership and the evolution of the project from early 1991 to the spring of 1996. The focus of this thesis is on the technical and policy decisions made in building BEV and on the involvement of the Blacksburg community. Several understandings, or visions, shaped and influenced how builders designed BEV and how the local community learned about it. These visions were described in the press conferences and media descriptions of the BEV project. The BEV Vision Statement included images of the project as a new marketplace, a place for electronic collaboration, a futuristic town, and a way for citizens to reconnect to their community. While the partnership is no longer the defining aspect of the project, the original partners were able to generate enthusiasm for the project and to create a market for information services in Blacksburg. They created the electronic village first and then asked residents to come rather than involving the villagers initially in the construction. The BEV project has now entered a new phase where villagers, volunteers and local companies play a greater role in BEV’s direction. This story of the BEV project provides some observations about envisioning, building, and participating in an electronic village. / Master of Science

Diss. (sammanfattning) Stockholm : Karolinska institutet, 2007. / Härtill 4 uppsatser.

Thesis (Ph. D.)--University of Alabama at Birmingham, 2007. / Title from first page of PDF file (viewed Feb. 17, 2009). Includes bibliographical references (p. 140-158).

Thesis (Ph. D.)--University of Washington, 2007. / Vita. Includes bibliographical references (leaves 104-116).

Fundação Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro / Esta pesquisa teve como objetivo analisar o itinerário da paternidade como uma construção social, a partir das relações estabelecidas entre os pais com os membros da instituição de saúde e as redes sociais em que se inserem. Tal construção se configurou na busca, pelo pai, de reconhecimento do exercício da paternidade, bem como suas repercussões na integralidade do cuidado ao recém-nascido de risco e sua família. Utilizamos como pressupostos conceituais para definição do itinerário da paternidade as teorias da integralidade (desenvolvidas pelo grupo LAPPIS), a teoria do reconhecimento (de Axel Honneth) e de redes sociais (de Paulo Henrique Martins). O cenário da pesquisa foi o Hospital Sofia Feldman, instituição filantrópica de direito privado localizada na periferia de Belo Horizonte, Estado de Minas Gerais. Participaram do estudo três pais que tiveram filhos internados na UTIN e seus familiares, além de profissionais, voluntários e gestores que atuam na instituição. A partir da abordagem da fenomenologia sociológica, realizaram-se entrevistas, observação dos espaços institucionais e dois grupos focais com familiares, adotando-se a Metodologia de Análise de Redes no Cotidiano (MARES) como técnica de coleta de dados. A análise dos itinerários da paternidade nos permitiu discutir as repercussões da trajetória desses pais nas dimensões da integralidade (políticas e organização dos serviços e saberes e práticas dos profissionais). Verificamos que a alta da companheira e internação do filho na neonatologia constituem uma inflexão no percurso dos pais no que concerne à questão do reconhecimento como usuário no serviço e a integralidade do cuidado à família. Além disso, identificamos que as relações estabelecidas no acolhimento desses pais pelos profissionais envolveram a negociação de saberes entre os profissionais, e destes com os usuários, que repercutiram na construção e reconstrução das práticas de cuidado na UTIN. Tais repercussões significaram, na prática, formas de inclusão do pai, que passa de uma situação de observador privilegiado do cuidado com o filho para um mediador colaborador na efetivação da integralidade da assistência do filho na UTIN. Vislumbramos o itinerário da paternidade como uma ferramenta de prática avaliativa na perspectiva do usuário amistosa à integralidade, que possibilita a revalorização da experiência e das relações entre os sujeitos, e que tem no agir em saúde o catalisador para as transformações do cuidado como exercício de cidadania.

Fundação Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro / Esta pesquisa teve como objetivo analisar o itinerário da paternidade como uma construção social, a partir das relações estabelecidas entre os pais com os membros da instituição de saúde e as redes sociais em que se inserem. Tal construção se configurou na busca, pelo pai, de reconhecimento do exercício da paternidade, bem como suas repercussões na integralidade do cuidado ao recém-nascido de risco e sua família. Utilizamos como pressupostos conceituais para definição do itinerário da paternidade as teorias da integralidade (desenvolvidas pelo grupo LAPPIS), a teoria do reconhecimento (de Axel Honneth) e de redes sociais (de Paulo Henrique Martins). O cenário da pesquisa foi o Hospital Sofia Feldman, instituição filantrópica de direito privado localizada na periferia de Belo Horizonte, Estado de Minas Gerais. Participaram do estudo três pais que tiveram filhos internados na UTIN e seus familiares, além de profissionais, voluntários e gestores que atuam na instituição. A partir da abordagem da fenomenologia sociológica, realizaram-se entrevistas, observação dos espaços institucionais e dois grupos focais com familiares, adotando-se a Metodologia de Análise de Redes no Cotidiano (MARES) como técnica de coleta de dados. A análise dos itinerários da paternidade nos permitiu discutir as repercussões da trajetória desses pais nas dimensões da integralidade (políticas e organização dos serviços e saberes e práticas dos profissionais). Verificamos que a alta da companheira e internação do filho na neonatologia constituem uma inflexão no percurso dos pais no que concerne à questão do reconhecimento como usuário no serviço e a integralidade do cuidado à família. Além disso, identificamos que as relações estabelecidas no acolhimento desses pais pelos profissionais envolveram a negociação de saberes entre os profissionais, e destes com os usuários, que repercutiram na construção e reconstrução das práticas de cuidado na UTIN. Tais repercussões significaram, na prática, formas de inclusão do pai, que passa de uma situação de observador privilegiado do cuidado com o filho para um mediador colaborador na efetivação da integralidade da assistência do filho na UTIN. Vislumbramos o itinerário da paternidade como uma ferramenta de prática avaliativa na perspectiva do usuário amistosa à integralidade, que possibilita a revalorização da experiência e das relações entre os sujeitos, e que tem no agir em saúde o catalisador para as transformações do cuidado como exercício de cidadania.

With each new innovation in technology since at least the Industrial Revolution, and probably before, optimists and pessimists have squared off in a cyclic debate over the impact of the day's newest technology. Self-proclaimed futurists for centuries have attempted to foretell the impact of technology on society with varied success. The goal of this research project is to study the effect of computer network technology on the social interactions of the local community organizations in Blacksburg, VA. Online surveys filled out by the leaders and members of these organizations measure different aspects of each organization and the use and usage of Internet technology within that organization. Correlations between the two may help us identify ways technology has affected the way we communicate with one another. Are community organizations communicating more or less? If so, how? Has face-to-face interaction been forsaken in lieu of technology such as email? The effects found in the survey results should give way to meaningful discourse on how technology can best be used to aid social interaction in local organizations. / Master of Science

Computer networks security is a topic which has been extensively researched. This research is fully justified when one notices the dimensions of the problem faced. One can easily identify different kinds of networks, a large quantity of network protocols, and an overwhelming amount of user applications that make extensive use of networks for the purposes those applications were built. This conforms a vast research field, where it is possible for a researcher to set his or her interests over a set of threats, vulnerabilities, or types of attacks, and devise a mechanism to prevent the attack, mitigate its effects or repair the final damages, based upon the specific characteristics of the scenario. Our research group on Computer Networks has been researching on certain kinds of computer networks security risks, specially those affecting wireless networks. In previous doctoral works [13], detection and exclusion methods for dealing with malicious nodes in mobile ad hoc networks (MANETs) had been proposed, from the point of view of every individual network node, using a technique called Intrusion Detection Systems (IDS) based on Watchdog methods. In this scope, we pretend to optimize network throughput removing misbehaved nodes from the network communication processes, a task performed specifically by the Watchdog systems. When isolated security techniques obtain good results on dealing with one type of attacks, a way to improve the whole network performance could be establishing mechanisms for cooperatively sharing information between well-behaved nodes to speed up misbehaved node detection and increase accuracy. Obviously, these mechanisms will have a cost in terms of network transmission overhead and also a small computing time overhead needed to analize the received data and to obtain an opinion about a suspect node. The key issue here it to adequately balance the costs and the benefits related to these cooperation techniques to ensure that the overall network performance is increased if compared with a non-collaborative one. / Serrat Olmos, MD. (2013). Cooperation techniques to improve peer-to-peer wireless networks security [Tesis doctoral]. Editorial Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/32831

Computing is moving away from the desktop, permeating into many everyday objects and the environments in which we live. Many researchers in ubiquitous computing are excited about the potential to profoundly change the way we live by revolutionizing how we interact with information. Despite the excitement, few successful applications are making the transition from the laboratories to the mass market. While this could easily be attributed to the immaturity of the research area, it is also a manifestation of a larger problem—the lack of coherent methods, processes or tools that assist designers in thinking about issues pertinent to ubiquitous computing, as they explore potential ideas and develop some of these into working prototypes. To this end, this research presents an overview of the important characteristics of ubiquitous computing systems identified by many of the leading researchers in the field. Contrasting with conventional systems, we discuss the resulting issues and challenges, and their implications on the future directions of this emerging research area. In a case study, we use scenario-based design to walkthrough the design of a community computing application. At various stages of the design process, the need to focus on more issues relevant to ubiquitous computing design became apparent, resulting in the augmentation of scenario-based design. The augmented scenario-based design process is proposed as a tool for helping designers conceptualize user activities within given usage circumstances and at various stages of the design process. New questions help to identify the most common pitfalls, enabling designers to produce systems that are more socially acceptable and provide a higher likelihood for adoption by everyday users beyond the laboratory. In initial testing, the augmented process was shown to produce better designs. The ultimate ambition of ubiquitous computing technology is to be able to serve users anywhere, at anytime. However, taking into account the dynamic nature of user needs and usage situations, is a novel and non trivial undertaking. In essence, it is a fundamental change that requires designers to rethink many of the conventional answers and processes that help guide the creation of interactive systems. We provide a promising approach. / Master of Science