Σε αυτή τη διδακτορική διατριβή μελετήσαμε τις δυνατότητες αξιοποίησης των οντολογιών στην αναπαράσταση γνώσης σε συστήματα απανταχού και κινητού υπολογίζειν. / In this thesis we studied the use of ontologies for knowledge representation in ubiquitous and mobile computing.

<p>Syftet med denna studie är att belysa situationen för asylsökande barn med uppgivenhetssymptom utifrån behandlarens perspektiv. Syftet är vidare att undersöka behandlarens upplevelser och erfarenheter av att vårda och stödja dessa barn.</p><p>Frågeställningarna som är i fokus berör den vård och stöd som behandlarna erbjuder till barnen och deras familjer, effekter av behandlingen samt specifika behandlingar som är särskilt verksamma i förhållande till de aktuella barnens tillstånd och behov.</p><p>Studien är av en kvalitativ design och den vetenskapliga positionen av konstruktivistisk karaktär. Det empiriska materialet består av intervjuer med nio behandlare som varit i direkt kontakt med barnen och deras föräldrar. Kommande tre teman har varit grundläggande i intervjuerna; symtombilden, vägen ut ur tillståndet och slutligen behandlarens reflektioner kring problemet/fenomenet.</p><p>Studiens teoretiska perspektiv som valdes i syfte att nå en ökad kunskap och förståelse kring fenomenet är; pervasive refusal syndrome, depressiv devitalisering, kvävande moderskap, hopplöshet hos barn, simulering samt munchenhausen by Proxy.</p><p>Studiens resultat och analys kom att visa att fenomenet apatiska flyktingbarn är mycket komplext i sig. Alla behandlare anser att en del barn är verkligt sjuka men att majoriteten av barnen avsiktligt framkallar detta tillstånd. Behandlare har kunnat bevittna flera tillfällen då barnet eller barnen kunde sitta utan hjälp samt gå och äta själva. Alla behandlare upplevde att det var svårt att samarbeta med en del av föräldrarna samt att det fanns ett starkt motstånd till behandlingsarbetet från föräldrarnas sida.</p>

Pervasive computing envisions an environment in which we are surrounded by many embedded computer devices. The existence of those networked devices provides us with a mobile, spontaneous and dynamic way to access various resources provided by different (security policy) domains. In recent years, we have witnessed the evolutionary development of numerous multiple domain applications. One of the richest examples is pervasive environments. Typi- cally, the conventional approach to secure access over multiple domains is to implement a unique trusted infrastructure, extending local identity or capa- bility based security systems and combining them with cross-domain authen- tication mechanisms. However, this does not adequately meet the security requirements of communicating with unknown players in pervasive environ- ments. Moreover, it is infeasible to define a global trust infrastructure and a set of assumptions that every player will trust in the multiple domain context. A powerful design technique to address those new security challenges posed by pervasive environments is to understand them from a domain perspective. This thesis presents Localisation of Trust (LoT), an architectural frame- work designed to address the security need of how to talk to correct strangers in pervasive environments. Based on the localising trust security principle, LoT provides a generic platform for building access control over multiple do- mains from two ends: authentication and authorisation. Firstly, LoT proposes a two-channel authentication protocol to replace traditional (strong) identity- based authentication protocols by exploring desirable contextual information for different pervasive applications. Then, delegation and localised authenti- cation are deployed to achieve authorisation in pervasive environments. The heart of this different semantic is to let the right domain get involved with its local players’ interactions by helping them to convert a “token” to a usable 2 access capability, whilst keeping revocation in mind. This is done by introduc- ing a domain-oriented Encryption-Based Access Control method, using ideas borrowed for Identity-based Encryption. The second part of this thesis describes several specific mechanisms and protocols including a Dual Capabilities Model to achieve the required anti- properties for LoT. Although novel, they are intended primarily as an existence proof rather than being claimed to be ideal. Depending upon the precise application and context, other mechanisms may be better. Most importantly, the architecture-focused LoT provides such a flexibility by introducing multiple domains as a primary concern but leaving untouched the security protocols underlying each single domain and system implementation. Finally, a single domain scenario, guest access, is examined with the light of LoT. The purpose of doing so is to enhance the understanding of domain and other concepts described in LoT and demonstrate the effectiveness and efficiency of LoT for the scenarios chosen.

This thesis is concerned with what pervasive risk management is, and how it can be achieved in practice. Specifically, it examines the effect of social processes and cultural factors on how risk management can be coordinated across and embedded within business processes and organisational culture. A growing literature addresses what is termed risk management maturity: the capability of an organisation to assess, manage, communicate and govern risk (and opportunity). Notwithstanding its benefits, the emphasis of this literature on risk management benchmarking and standardisation has led, arguably, to a bureaucratisation of risk management process. Research followed a case study strategy and data were gathered through semi-structured interviews. A total of 43 interviews were conducted in one private and one public sector organisation. The findings describe a number of social processes and related cultural factors that significantly affected risk management pervasiveness in the two organisations. (1) Shared experience and respect for experience facilitated flexible coordination between operational and strategic risk management. (2) Informal, lateral communication integrated the knowledge of diverse stakeholders required to manage complex environmental risks. (3) Lack of common understanding of the purpose and function of risk management undermined coordination of risk management practice. These findings progress the debate on the balance between standardisation and informal social process to achieve pervasive risk management, and contribute to a richer description of organisational risk management maturity. The findings are of value to risk managers wishing to embed the adaptive and coordinated risk management required in dynamic and complex environments

This diploma thesis "New urban games and their players" treats the new phenomenon of urban games. The text is based on the classical games theory joined with the latest developments in the area and some relevant concepts of urban sociology. From a sociological point of view this thesis explores urban games as a new leisure time phenomenon and clearly states its characteristics as well as its definition. The main focus lies in examining the recent developments in Czech urban games and describing the variety present in urban games today. Other related topics of urban activities are also explained. The mechanics of urban games is explored in the case study of Compagnie, an urban game that took place in Prague in 2010. In the case study, the urban game basics are shown in order to help the general public to understand it. This work is concluded with a socio-demographic analysis of urban game players based on an enquiry done with the participants of the game. The whole text mixes theoretic approach with practical study of urban games, sociological analysis and participatory observation.

En informatique ubiquitaire, l'observation du monde physique et de son "contexte" (une représentation haut niveau de la situation physique) est essentielle. Il existe de nombreux moyens pour observer le contexte. Typiquement, cela consiste en un traitement en plusieurs étapes commençant par la récupération de données brutes issues de capteurs. Diverses technologies de capteurs sont utilisées pour la récupération d'informations de bas niveau sur les activités physiques en cours. Ces données sont ensuite rassemblées, analysées et traitées ailleurs dans les systèmes d'information afin d'offrir une reconnaissance de contexte. Les applications déployées réagissent alors en fonction du contexte/de la situation détecté(e). Parmis les capteurs utilisés, les tags RFID, une technologie émergente, permettent de créer un lien virtuel direct entre les objets physiques et les systèmes d'information. En plus de stocker des identifiants, ils offrent un espace mémoire générique aux objets auxquels ils sont attachés, offrant de nouvelles possibilités d'architectures en informatique omniprésente. Dans cette thèse, nous proposons une approche originale tirant parti de l'espace mémoire offerts aux objets réels par les tags RFID. Dans notre approche, les objets supportent directement le système d'information. Ce type d'intégration permet de réduire les communications requises par le traitement à distance. Pour ce faire, des données sémantiques sont tout d'abord attachées aux objets afin de les rendre auto-descriptifs. Ainsi, les données pertinentes concernant une entité physique sont directement disponibles pour un traitement local. Les objets peuvent ensuite être liés virtuellement grâce à des structures de données dédiées ou ad hoc et distribuées sur les objets eux-mêmes. Ce faisant, le traitement des données peut se faire de façon directe. Par exemple, certaines propriétés peuvent être vérifiées localement sur un ensemble d'objets. Une relation physique peut être déduite directement de la structure de données, d'où le nom de "structures de données tangibles". Vis-à-vis des approches conventionnelles tirant parti des identifiants, notre approche offrent des avantages en termes de vie privée, de mise à l'échelle, d'autonomie et d'indépendance vis-à-vis des infrastructures. Le défi se situe au niveau de son expressivité limitée à cause du faible espace mémoire disponible sur les tags RFID. Les principes sont validés dans deux prototypes aux applications différentes. Le premier prototype est développé dans le domaine de la gestion de déchets afin d'aider le tri et d'améliorer le recyclage. Le deuxième offre des services supplémentaires, tels qu'une assistance lors du montage et de la vérification d'objets composés de plusieurs parties, grâce aux structures de données distribuées sur les différentes parties. / Pervasive computing or ambient computing aims to integrate information systems into the environment, in a manner as transparent as possible to the users. It allows the information systems to be tightly coupled with the physical activities within the environment. Everyday used objects, along with their environment, are made smarter with the use of embedded computing, sensors etc. and also have the ability to communicate among themselves. In pervasive computing, it is necessary to sense the real physical world and to perceive its “context” ; a high level representation of the physical situation. There are various ways to derive the context. Typically, the approach is a multi-step process which begins with sensing. Various sensing technologies are used to capture low level information of the physical activities, which are then aggregated, analyzed and computed elsewhere in the information systems, to become aware of the context. Deployed applications then react, depending on the context situation. Among sensors, RFID is an important emerging technology which allows a direct digital link between information systems and physical objects. Besides storing identification data, RFID also provides a general purpose storage space on objects, enabling new architectures for pervasive computing. In this thesis, we defend an original approach adopting the later use of RFID i.e. a digital memory integrated to real objects. The approach uses the principle where the objects self-support information systems. This way of integration reduces the need of communication for remote processing. The principle is realized in two ways. First, objects are piggybacked with semantic information, related to itself ; as self-describing objects. Hence, relevant information associated with the physical entities are readily available locally for processing. Second, group of related objects are digitally linked using dedicated or ad-hoc data structure, distributed over the objects. Hence, it would allow direct data processing - like validating some property involving the objects in proximity. This property of physical relation among objects can be interpreted digitally from the data structure ; this justifies the appellation “Tangible Data Structures”. Unlike the conventional method of using identifiers, our approach has arguments on its benefits in terms of privacy, scalability, autonomy and reduced dependency with respect to infrastructure. But its challenge lies in the expressivity due to limited memory space available in the tags. The principles are validated by prototyping in two different application domains. The first application is developed for waste management domain that helps in efficient sorting and better recycling. And the second, provides added services like assistance while assembling and verification for composite objects, using the distributed data structure across the individual pieces.

While much attention in location-based game and wearable research is about their benefits as in-class education or is aimed at children, rather less research has been done about the combination of location-based games and wearables in private use. This paper investigates a game solution for the low history knowledge of German teenagers and focuses on the learning success of the combination of a proposed location-based mobile game and wearable, called ‘Geocation’ for educational purposes as well as the enjoyment of it. Two prototype sets, functional and appearance, about the location-relevant topic ‘King Ludwig II’ were created and tested with 36 teenagers in Munich. To analyze the learning success pre-and post-test surveys were conducted and applied to the strategy of gamification. The enjoyment of the combination of the location-based mobile game and wearable was evaluated by connecting it to the GameFlow theory and conducting post-test interviews. The study has shown that the connected wearable was not crucial for the player’s learning success; however, it contributed to the user’s motivation and enjoyment.

Com os avanços dos processos da microeletrônica temos dispositivos menores e com maior poder de computação e comunicação. Um Ambiente Pervasivo contém diferentes dispositivos, tais como sensores, atuadores, eletroeletrônicos e dispositivos móveis que interagem com a pessoa de forma natural ao conhecer o contexto. A diversidade de dispositivos e informações do Ambiente Pervasivo introduz um problema de interoperabilidade. Um Ambiente Pervasivo é dinâmico devido à mobilidade do usuário, a variedade de dispositivos. Neste trabalho, é proposto um modelo semântico de contexto para permitir interoperabilidade e fornecer suporte ao dinamismo do Ambiente Pervasivo. O modelo proposto contém características da modelagem de contexto realizadas por trabalhos anteriores, assim como sua integração com a modelagem de preferências das pessoas, políticas de privacidade e serviços. Verificou-se que o modelo de contexto proposto é adequado mediante sua aplicação em um Estudo de Caso e mediante testes realizados. Mostra-se que a modelo de contexto utilizado ontologias e Serviços Web Semânticos permite tratar com informação incompleta e inconsistente, bem como fornece suporte na interoperabilidade e ao dinamismo do Ambiente Pervasivo. / Advances in microelectronic processes have allowed smaller devices with more computation and communication power. Pervasive environment contains different devices like electronic sensor, actuators and mobile devices which interact with the person naturally after the context is known. The device and information diversity introduce an interoperability problem. Pervasive environments are dynamics because of user\'s mobility and a variety of devices. In this work, we propose a context model to allow interoperability and to give support to pervasive environment dynamism. The proposed model contains features of context modeling developed in previous works, as well as, their integration with the modeling of the people\'s preferences, privacy policies and services. It was verified that the context model is appropriate by their application in a Case Study and by accomplished tests. It is shown that the model of context using ontologies and Semantic Web Services allow us to work with inconsistent and incomplete information, as well as gives support to interoperability and dynamism of the Pervasive Environment.

Com os avanços dos processos da microeletrônica temos dispositivos menores e com maior poder de computação e comunicação. Um Ambiente Pervasivo contém diferentes dispositivos, tais como sensores, atuadores, eletroeletrônicos e dispositivos móveis que interagem com a pessoa de forma natural ao conhecer o contexto. A diversidade de dispositivos e informações do Ambiente Pervasivo introduz um problema de interoperabilidade. Um Ambiente Pervasivo é dinâmico devido à mobilidade do usuário, a variedade de dispositivos. Neste trabalho, é proposto um modelo semântico de contexto para permitir interoperabilidade e fornecer suporte ao dinamismo do Ambiente Pervasivo. O modelo proposto contém características da modelagem de contexto realizadas por trabalhos anteriores, assim como sua integração com a modelagem de preferências das pessoas, políticas de privacidade e serviços. Verificou-se que o modelo de contexto proposto é adequado mediante sua aplicação em um Estudo de Caso e mediante testes realizados. Mostra-se que a modelo de contexto utilizado ontologias e Serviços Web Semânticos permite tratar com informação incompleta e inconsistente, bem como fornece suporte na interoperabilidade e ao dinamismo do Ambiente Pervasivo. / Advances in microelectronic processes have allowed smaller devices with more computation and communication power. Pervasive environment contains different devices like electronic sensor, actuators and mobile devices which interact with the person naturally after the context is known. The device and information diversity introduce an interoperability problem. Pervasive environments are dynamics because of user\'s mobility and a variety of devices. In this work, we propose a context model to allow interoperability and to give support to pervasive environment dynamism. The proposed model contains features of context modeling developed in previous works, as well as, their integration with the modeling of the people\'s preferences, privacy policies and services. It was verified that the context model is appropriate by their application in a Case Study and by accomplished tests. It is shown that the model of context using ontologies and Semantic Web Services allow us to work with inconsistent and incomplete information, as well as gives support to interoperability and dynamism of the Pervasive Environment.

Submitted by Rosivalda Pereira (mrs.pereira@ufma.br) on 2017-08-14T18:44:38Z No. of bitstreams: 1 AntonioPalmeiraFilho.pdf: 3164841 bytes, checksum: 23d94c0539749a601438bcd53f1d7384 (MD5) / Made available in DSpace on 2017-08-14T18:44:38Z (GMT). No. of bitstreams: 1 AntonioPalmeiraFilho.pdf: 3164841 bytes, checksum: 23d94c0539749a601438bcd53f1d7384 (MD5) Previous issue date: 2007-11-09 / Mobile devices have evolved from simple personal digital assistants or cell phones to cutting-edge personal digital assistants, aliasing or combining on-the- y video/audio acquisition and data processing. But giving the best usage to all this new technology in our day-by-day tasks still is challenging. The large variety of devices, the increasing need for ubiquitous mobile services and the network heterogeneity are just some problems developers may nd when deploying for the mobile world. With the popularization of the wireless network technologies, we can nd devices capable of establishing network connections using di erent technologies. Infrastructured networks support good bandwidth with low latency, but they demand an infrastructure of access points that are not available at any place. On the other hand, ad-hoc networks don't need an infrastructure and the communication is done in a peer-to-peer maner. The ad-hoc networks play an important rule in the environments made by mobile devices since they ensure high availability. Spontaneous networks are ad-hoc networks formed occasionally by users that wish to engage in some collaborative task, like a le sharing. In this work we describe a framework to help developers to easily create applications capable of managing and sharing digital content within groups of people in a spontaneous short-range ad-hoc network. We describe the framework architecture, its services and their relationship, as well as some usage scenarios, applications and related works. / Dispositivos móveis evoluíram de simples agendas, calendários ou telefones celulares para modernos assistentes pessoais, capazes de armazenar e processar áudio e vídeo em tempo real. Contudo, dar a melhor utilidade a esta tecnologia em nossas tarefas do dia-a-dia ainda é um desafio. A grande variedade de dispositivos, a crescente necessidade de serviços móveis pervasivos e a heterogeneidade das tecnologias de rede são apenas alguns exemplos dos problemas possivelmente encontrados pelos desenvolvedores ao produzir software para o mundo móvel. Com a popularização das tecnologias de rede, é cada vez mais comum encontrarmos dispositivos móveis capazes de estabelecer conexões através de diferentes tecnologias. Redes infra-estruturadas disponibilizam boas larguras de banda e baixa latência, porém necessitam de uma infra-estrutura de pontos de acesso nem sempre disponível. Por outro lado, as redes ad-hoc não necessitam de infra-estrutura e a comunicação entre seus nós é feita ponto a ponto, razão pela qual desempenham um importante papel nos ambientes formados por dispositivos móveis. Redes espontâneas são redes ad-hoc formadas ao acaso por usuários que desejam participar de alguma tarefa colaborativa, como o compartilhamento de arquivos. Neste trabalho apresentamos um framework cujo objetivo é ajudar os desenvolvedores a criar facilmente aplicações capazes de gerenciar e compartilhar conteúdo digital com grupos de usuários em redes ad-hoc espontâneas de curto alcance. São descritos a arquitetura do framework proposto, seus serviços e relacionamentos, assim como alguns cenários de uso, aplicações e trabalhos relacionados.