Thesis (M.Info.Tech.)--University of Wollongong, 2005. / Includes appendices. Typescript. Includes bibliographical references: leaf 100-105.

University, Diss.--Bamberg, 2007.

Thesis (M.Sc. (Computer Science)) - Rhodes University, 2008.

Thesis (M.Sc.)--University of Waikato, 2007. / Title from PDF cover (viewed May 15, 2009) Includes bibliographical references (p. 99-100)

Thesis (M.S.)--Florida State University, 2006. / Advisor: Yassir AbdelRazig, Florida State University, College of Engineering, Dept. of Civil and Environmental Engineering. Title and description from dissertation home page (viewed Sept. 15, 2006). Document formatted into pages; contains xiii, 341 pages. Includes bibliographical references.

This qualitative study of networks of entrepreneurs in the mobile technology industry in three ecosystems - Kathmandu, Nairobi and London - examines perceptions and attitudes of entrepreneurs related to their networking activities. The focus is on understanding the entrepreneurs' motivations for, and benefits and risks of networking, as well as the overall trends of development of the three ecosystems, which are very different from each other in terms of socioeconomic circumstances. The findings provide new insights into the link between the concept of a community of supportive peers and the acquisition of subjective resources, such as self-efficacy and legitimacy, while also supporting conclusions of earlier empirical and theoretical work linking networks with the acquisition of resources necessary for founding and building a new firm. A comparison of results across the three ecosystems uncovers a strong tendency towards institutional convergence of the three ecosystems based on a model inspired by the Silicon Valley experience. The mechanisms through which this is found to occur are mimesis and storytelling, motivated primarily by learning goals and the pursuit of legitimacy for entrepreneurial action in the mobile technology industry, as well as for the individual ventures. The overall finding emerging from the cases is that, despite significant differences, the three ecosystems are reliant on a shared pool of relevant information and knowledge, via the Internet and through personal and organizational connections. They resemble one another not only in terms of resources sought by entrepreneurs through their networks, but also in the ways entrepreneurs signal their purpose and value to their community, and in the way the describe their environment - through references to other entrepreneurship ecosystems. In the absence of an existing theoretical approach to analyzing convergence of diverse entrepreneurship ecosystems, the study proposes a framework based on DiMaggio and Powell's theory of institutional isomorphism, and integrating the works of Wiewel and Hunter, on legitimacy-building by association through networks, and Djelic, on the process of cross-national transfer, or export, of economic models. The type of isomorphism perceived is termed "aspirational," since it is found to occur in the context of pursuing a specific outcome previously achieved by the application of a particular institutional model. The difference between "aspirational isomorphism" and behaviours described by DiMaggio and Powell lies in the interpretation and adaptation of a model that can then be embedded in a nascent institutional environment (in this case, an entrepreneurial ecosystem). Rather than pure mimesis, aspirational isomorphism is a flexible and creative endeavor.

abstract: With the rise of mobile technology, the personal lives and sensitive information of everyday citizens are carried about without a thought to the risks involved. Despite this high possibility of harm, many fail to use simple security to protect themselves because they feel the benefits of securing their devices do not outweigh the cost to usability. The main issue is that beyond initial authentication, sessions are maintained using optional timeout mechanisms where a session will end if a user is inactive for a period of time. This interruption-based form of continuous authentication requires constant user intervention leading to frustration, which discourages its use. No solution currently exists that provides an implementation beyond the insecure and low usability of simple timeout and re-authentication. This work identifies the flaws of current mobile authentication techniques and provides a new solution that is not limiting to the user, has a system for secure, active continuous authentication, and increases the usability and security over current methods. / Dissertation/Thesis / Masters Thesis Computer Science 2014

To obtain higher profitability in farms, it is essential to proper management of the operations performed, caused by concern over the operational cost of the machines used, which represents a high percentage compared to total costs of operation and can be up to forty percent. This cost can be reduced if the use of machinery is optimized, improving performance and efficiency operational, which is possible by monitoring the machine during its activity in the field. The information for the control can be obtained through the network of sensors and / or Global Positioning System (GPS), which detect and report any physical characteristic of the environment. The telemetry transmission allows instant communication with remote areas through wireless network, with a central information collection. Therefore, the purpose of this study is to develop a prototype Decision Support System for use in Agribusiness (SADA), which allows the manager of agribusiness to the operational control of the agricultural machine. The system was tested in a real harvesting operations in rice and soybean and the harvester machine used was a Massey Ferguson brand, 5650. The tests showed that the redundancy was effective and ensured the transmission through the exchange of technology without degradation of time, since in case of disconnection of the GSM modem, the system takes 30 milliseconds to connect to Xtend and send the data. The system T-SADA has achieved its objectives, secured transmission of data with fault tolerance and redundantly in remote locations and different relief as plain (without obstacles) and small elevations (with some obstacles, hills). The implementation of SADA allowed the confirmation of the hypothesis that the telemetry (T-SADA), combined with a management system (G-SADA), lets you monitor the performance of agricultural machinery on field operations and alert the wrong done. / Para a obtenção de maior lucratividade em propriedades agrícolas, torna-se essencial o correto gerenciamento das operações executadas, ocasionado pela preocupação com o custo operacional das máquinas utilizadas, que representa um percentual elevado em relação aos custos totais da exploração, podendo ser de até quarenta por cento. Esse custo pode ser reduzido se o uso da maquinaria for otimizado, melhorando o desempenho e a eficiência em trabalho, o que é possível através do monitoramento da máquina durante a sua atividade em campo. As informações para o controle podem ser obtidas através de rede de sensores e/ou de Global Positioning System (GPS), que detectam e transmitem alguma característica física do ambiente. A transmissão via telemetria possibilita a comunicação instantânea de áreas remotas, por meio de rede sem fio, com uma central de captação de informações. Assim sendo, a proposta deste trabalho é desenvolver um protótipo de Sistema de Apoio à Decisão para utilização no Agronegócio (SADA), que permita ao gerente do agronegócio fazer o controle operacional da máquina agrícola. O sistema foi testado em situação real, em operações de colheita de arroz e de soja e a máquina usada foi uma colhedora modelo MF 5650, da marca Massey Ferguson. Os testes realizados demonstraram que a redundância foi eficaz e garantiu a transmissão com a troca de tecnologia sem degradação do tempo, já que em caso de desconexão do modem GSM, o sistema leva 30 milisegundos para se conectar ao Xtend e enviar os dados. O sistema T-SADA alcançou os objetivos propostos, garantiu a transmissão dos dados com tolerância a falhas e de forma redundante em locais remotos e de relevos diferenciados, como planície (sem obstáculos) e coxilhas (com alguns obstáculos, morros). A implementação do sistema SADA possibilitou a comprovação da hipótese de que a telemetria (T-SADA), associada a um sistema de gerenciamento (G-SADA), permite monitorar o desempenho de uma máquina agrícola em campo e alertar as operações errôneas realizadas.

Orientador: Aleardo Junior Manacero / Banca: Maurício Araújo Dias / Banca: Marcos Antônio Simplício Júnior / Resumo: O desenvolvimento de tecnologias móveis tem criado oportunidades para uso de aplicações remotas executando em dispositivos como smartphones. Para algumas dessas aplicações é essencial que a autenticação seja feita de modo seguro e eficiente. Nesse sentido surge o uso da tecnologia NFC (Near Field Communication) para obter segurança para transações executadas em aplicativos móveis. Esse tipo de aplicação é bastante interessante para a realização de comércio eletrônico, bem como controle de acesso a informações sigilosas, como dados bancários, por exemplo. Neste trabalho, apresentam-se dois protocolos para fazer a autenticação de dispositivos através de etiquetas NFC, com técnicas de criptografia assimétrica usando algoritmos de curvas elípticas. Ao longo do texto são apresentados os principais conceitos sobre NFC, criptografia e a classe de web services REST (Representational State Transfer), que serve como padrão para a construção dos protótipos dos protocolos Protecting Touch aqui desenvolvidos. Os detalhes sobre a implementação desses protocolos são também apresentados, assim como resultados de experimentos para sua avaliação / Abstract: The appearance of mobile technologies created opportunities for remote applications running in devices such as smartphones. In some of these applications it is essential that authentication have to be performed in a secure and ecient way. In this sense the use of NFC (Near Field Communication) technology came to provide safety to transactions executed through mobile applications. This kind of application is rather attractive to perform electronic commerce, as well as access control for sensitive data, such as banking accounts. In this work it is presented two protocols for user authentication through NFC tags, using asymmetric cryptography by elliptic curves. Throughout the text we present the main concepts about NFC, cryptography and the web services REST (Representational State Transfer), which is used as the building framework for the prototypes of the Protecting Touch protocols presented here. Details about the protocols implementation are also presented, as well as results from the evaluation experiments of these protocols / Mestre

A agricultura de precisão (AP) é um das grandes responsáveis pela inserção de tecnologias cada vez mais avançadas dentro dos sistemas de produção agrícola. Um equipamento que já faz parte da AP é o computador de mão (Personal Digital Assistant, PDA). Porém com a evolução crescente dos dispositivos móveis tais como smartphones e tablets, os PDAs têm se tornado uma alternativa mais obsoleta do ponto de vista tecnológico. São várias as características que tornam smartphones e tablets dispositivos móveis mais atraentes tecnologicamente. A comunicação direta destes com sistemas de posicionamento via satélite foi o primeiro passo para torna-los válidos para o uso em AP. Além disso, dentre as tecnologias de computação, a computação móvel é a que tem mais aceitação pelos usuários do meio agrícola devido à gradativa inserção mercadológica que os telefones celulares exerceram durante os anos passados em todo o mundo. Com a ideia de criar uma nova ferramenta para a AP baseando-se no reconhecimento de voz para substituir e/ou minimizar o uso das telas sensíveis ao toque e planilhas no campo foi escolhido o sistema operacional Android para o desenvolvimento desse aplicativo. O projeto se baseou inicialmente em revisão bibliográfica de estudos de aplicativos móveis desenvolvidos para a AP e por acompanhamento em campo de procedimentos de coleta de dados. O aplicativo resultante desse desenvolvimento se baseou em três partes: configurações, coleta de dados por voz e mapas. Na parte de configurações é permitido ao usuário configurar opções como: variáveis de coleta, uso do GPS (Global Positioning System), uso do reconhecimento de voz, pasta de armazenamento e informações cadastrais. Na coleta de dados por voz o usuário tem um formulário com as variáveis configuradas, que é preenchido por reconhecimento de voz, automaticamente. Os mapas utilizados para auxiliar o usuário a se orientar pelo campo são criados a partir do sistema Google Maps®. É possível também habilitar um assistente de voz que fala ao usuário, por sintetização de voz, o nome da variável que está coletando e confirma para ele o valor que foi reconhecido a partir de sua voz. Um arquivo \'txt\' é criado a partir das informações do formulário contendo também as coordenadas geográficas de cada ponto de coleta, obtidas pelo sistema integrado de GPS do dispositivo, e esse arquivo pode ser utilizado para a entrada de dados em sistemas de informação geográfica (SIG) para a criação de mapas posteriormente. / Precision agriculture (PA) is one of the major responsible for the insertion of increasingly advanced technologies within agricultural production systems. Equipment that is already part of precision agriculture is the handheld computer (PDA). But with the growing trend of mobile devices such as smartphones and tablets, PDAs have become a more obsolete option in the technological context. There are several characteristics that make these devices technologically more attractive. Direct communication of such devices with satellite positioning systems was the first step to make them applicable for use in PA. Moreover, among the computing technologies, mobile computing has more acceptance by users of agricultural marketing due to the gradual insertion that mobile phones have had over the past years worldwide. With the idea of creating a new tool for PA based on the speech recognition to replace and/or minimize the use of touchscreen and worksheets in the field, Android was chosen as the operating system for the development of this application. The design was based initially on studies of mobile applications developed for PA through published articles or through monitoring procedures in field data collection. The application resulting from this development is based on three parts: settings, speech data collection and maps. Part of settings allows the user to set some options for operation of the application as: variables to collect, use of GPS, use of speech recognition, file storage folder to \'txt\' file and registration information, etc. In the data collection the user configures the variables he wants to collect and the application creates a form that is filled through speech recognition automatically. The map is used to help the user navigate the route through the use of Google Maps® base. It is possible to enable a voice assistant that tells him, by voice synthesizer, the name of the variable he is collecting and confirms to him the value that has been recognized by his voice. A \'txt\' file is created containing data along with geographic coordinates obtained from the onboard GPS of the device and it can be used for creating maps in geographic information systems (GIS).