<p>U okviru disertacije predstavljene su metode realizacije kontekstualnih platformi i kontekstualnih korisničkih sprega za uređaje potrošačke elektronike. Predloženi su algoritmi semantizacije konteksta i procene zauzetosti korisnika, arhitektura rešenja i rezultati evaluacije.</p><p>&nbsp;</p> / <p>In this dissertation methods of implementation of context-aware platforms and context-aware user interfaces for applications in consumer electronics are presented. The work includes the proposition of algorithms for context semantization and user availability estimation, architecture of the solution as well as the results of evaluation experiments.</p>

Les récentes avancées technologiques permettent désormais la fabrication de terminaux mobiles de plus en plus compacts et dotés de plusieurs interfaces réseaux. Le nouveau modèle de consommation de médias se résume par le concept "Anytime, Anywhere, Any Device" et impose donc de nouvelles exigences en termes de déploiement de services ubiquitaires. Cependant la conception et le developpement de réseaux ubiquitaires et convergents de nouvelles générations soulèvent un certain nombre de défis techniques. Les standards actuels ainsi que les solutions commerciales pourraient être affectés par le manque de considération du contexte utilisateur. Le ressenti de l'utilisateur concernant certains services multimédia tels que la VoIP et l'IPTV dépend fortement des capacités du terminal et des conditions du réseau d'accès. Cela incite les réseaux de nouvelles générations à fournir des services ubiquitaires adaptés à l'environnement de l'utilisateur optimisant par la même occasion ses resources. L'IP Multimedia Subsystem (IMS) est une architecture de nouvelle génération qui centralise l'accès aux services et permet la convergence des réseaux fixe/mobile. Néanmoins, l'évolution de l'IMS est nécessaire sur les points suivants :- l'introduction de la sensibilité au contexte utilisateur et de la PQoS (Perceived QoS) : L'architecture IMS ne prend pas en compte l'environnement de l'utilisateur, ses préférences et ne dispose pas d'un méchanisme de gestion de PQOS. Pour s'assurer de la qualité fournit à l'utilisateur final, des informations sur l'environnement de l'utilisateur ainsi que ses préférences doivent transiter en cœur de réseau afin d'y être analysés. Ce traitement aboutit au lancement du service qui sera adapté et optimisé aux conditions observées. De plus pour le service d'IPTV, les caractéristiques spatio-temporelles de la vidéo influent de manière importante sur la PQoS observée côté utilisateur. L'adaptation des services multimédias en fonction de l'évolution du contexte utilisateur et de la nature de la vidéo diffusée assure une qualité d'expérience à l'utilisateur et optimise par la même occasion l'utilisation des ressources en cœur de réseau.- une solution de mobilité efficace pour les services conversationnels tels que la VoIP : Les dernières publications 3GPP fournissent deux solutions de mobilité: le LTE propose MIP comme solution de mobilité alors que l'IMS définit une mobilité basée sur le protocole applicatif SIP. Ces standards définissent le système de signalisation mais ne s'avancent pas sur la gestion du flux média lors du changement d'interface réseau. La deuxième section introduit une étude comparative détaillée des solutions de mobilité dans les NGNs.Notre première contribution est la spécification de l'architecture globale de notre plateforme IMS sensible au contexte utilisateur réalisée au sein du projet Européen ADAMANTIUM. Nous détaillons tout d'abord le serveur MCMS intelligent placé dans la couche application de l'IMS. Cet élément récolte les informations de qualité de services à différents équipements réseaux et prend la décision d'une action sur l'un de ces équipements. Ensuite nous définissons un profil utilisateur permettant de décrire son environnement et de le diffuser en coeur de réseau. Une étude sur la prédiction de satisfaction utilisateur en fonction des paramètres spatio-temporels de la vidéo a été réalisée afin de connaître le débit idéal pour une PQoS désirée.Notre deuxième contribution est l'introduction d'une solution de mobilité adaptée aux services conversationnels (VoIP) tenant compte du contexte utilisateur. Notre solution s'intègre à l'architecture IMS existante de façon transparente et permet de réduire le temps de latence du handover. Notre solution duplique les paquets de VoIP sur les deux interfaces actives pendant le temps de la transition. Parallèlement, un nouvel algorithme de gestion de mémoire tampon améliore la qualité d'expérience pour le service de VoIP. / The latest advances in technology have already defied Moore’s law. Thanks to research and industry, hand-held devices are composed of high processing embedded systems enabling the consumption of high quality services. Furthermore, recent trends in communication drive users to consume media Anytime, Anywhere on Any Device via multiple wired and wireless network interfaces. This creates new demands for ubiquitous and high quality service provision management. However, defining and developing the next generation of ubiquitous and converged networks raise a number of challenges. Currently, telecommunication standards do not consider context-awareness aspects for network management and service provisioning. The experience felt by the end-user consuming for instance Voice over IP (VoIP) or Internet Protocol TeleVision (IPTV) services varies depending mainly on user preferences, device context and network resources. It is commonly held that Next Generation Network (NGN) should deliver personalized and effective ubiquitous services to the end user’s Mobile Node (MN) while optimizing the network resources at the network operator side. IP Multimedia Subsystem (IMS) is a standardized NGN framework that unifies service access and allows fixed/mobile network convergence. Nevertheless IMS technology still suffers from a number of confining factors that are addressed in this thesis; amongst them are two main issues :The lack of context-awareness and Perceived-QoS (PQoS):-The existing IMS infrastructure does not take into account the environment of the user ,his preferences , and does not provide any PQoS aware management mechanism within its service provisioning control system. In order to ensure that the service satisfies the consumer, this information need to be sent to the core network for analysis. In order to maximize the end-user satisfaction while optimizing network resources, the combination of a user-centric network management and adaptive services according to the user’s environment and network conditions are considered. Moreover, video content dynamics are also considered as they significantly impact on the deduced perceptual quality of IPTV services. -The lack of efficient mobility mechanism for conversational services like VoIP :The latest releases of Third Generation Partnership Project (3GPP) provide two types of mobility solutions. Long-Term Evolution (LTE) uses Mobile IP (MIP) and IMS uses Session Initiation Protocol (SIP) mobility. These standards are focusing on signaling but none of them define how the media should be scheduled in multi-homed devices. The second section introduces a detailed study of existing mobility solutions in NGNs. Our first contribution is the specification of the global context-aware IMS architecture proposed within the European project ADAptative Management of mediA distributioN based on saTisfaction orIented User Modeling (ADAMANTIUM). We introduce the innovative Multimedia Content Management System (MCMS) located in the application layer of IMS. This server combines the collected monitoring information from different network equipments with the data of the user profile and takes adaptation actions if necessary. Then, we introduce the User Profile (UP) management within the User Equipment (UE) describing the end-user’s context and facilitating the diffusion of the end-user environment towards the IMS core network. In order to optimize the network usage, a PQoS prediction mechanism gives the optimal video bit-rate according to the video content dynamics. Our second contribution in this thesis is an efficient mobility solution for VoIP service within IMS using and taking advantage of user context. Our solution uses packet duplication on both active interfaces during handover process. In order to leverage this mechanism, a new jitter buffer algorithm is proposed at MN side to improve the user’s quality of experience. Furthermore, our mobility solution integrates easily to the existing IMS platform.

Avec l'apparition des paradigmes des systèmes ubiquitaires ou omniprésents et de l'intelligence ambiante, on assiste à l'émergence d'un nouveau domaine de recherche visant à créer des environnements ou écosystèmes intelligents pouvant offrir une multitude de services permettant d'améliorer la qualité de vie, l'état physique et mental, et le bien-être social des usagers. Dans cette thèse, nous nous focalisons sur la problématique de la représentation sémantique des connaissances et du raisonnement dans le cadre des systèmes à intelligence ambiante et des robots ubiquitaires. Nous proposons deux modèles sémantiques permettant d'améliorer les fonctions cognitives de ces systèmes en termes de gestion du contexte. Au premier modèle, de type ontologique, sont associés un langage de règles et un raisonnement réactif pour la sensibilité au contexte. Pour prendre en compte le caractère dynamique du contexte et assurer une prise de décision cohérente, le mode de raisonnement retenu garantit deux propriétés essentielles : la décidabilité et la non-monotonie. Le deuxième modèle, également de type ontologique, complète le modèle précédent en termes d'expressivité pour la représentation de contextes non-triviaux et/ou liés au temps. Il s'appuie sur des relations n-aires et une représentation narrative des événements pour inférer des causalités entre événements et reconnaitre des contextes complexes non-observables à partir d'événements passés et courants. Les modèles proposés ont été mis en oeuvre et validés sur la plateforme ubiquitaire d'expérimentation du LISSI à partir de trois scenarii d'assistance cognitive et de reconnaissance de contexte / With the appearance of the paradigms of ubiquitous systems and ambient intelligence, a new domain of research is emerging with the aim of creating intelligent environments and ecosystems, that can provide multiple services that can improve quality of life, the physical and mental status and the social wellness of the users. In this thesis, we address the problem of semantic knowledge representation and reasoning, in the context of ambient intelligent systems and ubiquitous robots. We propose two semantic models that improve the cognitive functions of these systems, in terms of context recognition, and context adaptation. The first one is an ontology-based model, which is associated with a rule language to model reactive reasoning process on contextual knowledge. To take into account the dynamicity of context and insure coherent decision-making, this process guarantees two essential properties: decidability and non-monotonic reasoning. The second model is also an ontology-based model that completes the previous model in terms of expressiveness for semantic representation of non-trivial contexts with temporal dimension It is based on n-ary relations and a narrative representation of events for inferring causalities between events, and therefore to build the chronological context of a situation as from past and current events. The proposed models have been implemented on the ubiquitous experimental platform of LISSI, and validated through three scenarios for cognitive assistance and context recognition

La robotique ambiante s'intéresse à l'introduction de robots mobiles au sein d'environnements actifs où ces derniers fournissent des fonctionnalités alternatives ou complémentaires à celles embarquées par les robots mobiles. Cette thèse étudie la mise en concurrence des fonctionnalités internes et externes aux robots, qu'elle pose comme un problème de sélection de services logiciels. La sélection de services consiste à choisir un service ou une combinaison de services parmi un ensemble de candidats capables de réaliser une tâche requise. Pour cela, elle doit prédire et évaluer la performance des candidats. Ces performances reposent sur des critères non-fonctionnels comme la durée d'exécution, le coût ou le bruit. Ce domaine applicatif a pour particularité de nécessiter une coordination étroite entre certaines de ses fonctionnalités. Cette coordination se traduit par l'échange de flots de données entre les fonctionnalités durant leurs exécutions. Les fonctionnalités productrices de ces flots sont modélisées comme des services continus. Cette nouvelle catégorie de services logiciels impose que les compositions de services soient hiérarchiques et introduit des contraintes supplémentaires pour la sélection de services. Cette thèse met en évidence la présence d'un important couplage non-fonctionnel entre les performances des instances de services de différents niveaux, même lorsque les flots de données sont unidirectionnels. L'approche proposée se concentre sur la prédiction de la performance d'une instance de haut-niveau sachant son organigramme à l'issue de la sélection. Un organigramme regroupe l'ensemble des instances de services sollicitées pour réaliser une tâche de haut-niveau. L'étude s'appuie sur un scénario impliquant la sélection d'un service de positionnement en vue de permettre le déplacement d'un robot vers une destination requise. Pour un organigramme considéré, la prédiction de performance d'une instance de haut-niveau de ce scénario introduit les exigences suivantes : elle doit (i)être contextuelle en tenant compte, par exemple, du chemin suivi pour atteindre la destination requise, (ii) prendre en charge le remplacement d'une instance de sous-service suite à un échec ou, par extension, de façon opportuniste. En conséquence, cette sélection de services est posée comme un problème de prise de décision séquentielle formalisé à l'aide de processus de décision markoviens à horizon fini. La dimensionnalité importante du contexte en comparaison à la fréquence des déplacements du robot rend inadaptées les méthodes consistant à apprendre directement une fonction de valeur ou une fonction de transition. L'approche proposée repose sur des modèles de dynamique locaux et exploite le chemin de déplacement calculé par un sous-service pour estimer en ligne les valeurs des organigrammes disponibles dans l'état courant. Cette estimation est effectuée par l'intermédiaire d'une méthode de fouille stochastique d'arbre, Upper Confidence bounds applied to Trees / Ambient robotics aims at introducing mobile robots in active environments where the latter provide new or alternative functionalities to those shipped by mobile robots. This thesis studies the competition between robot and external functionalities, which is set as a service selection problem. Service selection consists in choosing a service or a combination of services among a set of candidates able to fulfil a given request. To do this, it has to predict and evaluate candidate performances. These performances are based on non-functional requirements such as execution time, cost or noise. This application domain requires tight coordination between some of its functionalities. Tight coordination involves setting data streams between functionalities during their execution. In this proposal, functionalities producing data streams are modelled as continuous services. This new service category requires hierarchical service composition and adds some constraints to the service selection problem. This thesis shows that an important non-functional coupling appears between service instances at different levels, even when data streams are unidirectional. The proposed approach focuses on performance prediction of an high-level service instance given its organigram. This organigram gathers service instances involved in the high-level task processing. The scenario included in this study is the selection of a positioning service involved in a robot navigation high-level service. For a given organigram, performance prediction of an high-level service instance of this scenario has to: (i) be contextual by, for instance, considering moving path towards the required destination, (ii) support service instance replacement after a failure or in an opportunist manner. Consequently, this service selection is set as a sequential decision problem and is formalized as a finite-horizon Markov decision process. Its high contextual dimensionality with respect to robot moving frequency makes direct learning of Q-value functions or transition functions inadequate. The proposed approachre lies on local dynamic models and uses the planned moving path to estimate Q-values of organigrams available in the initial state. This estimation is done using a Monte-Carlo tree search method, Upper Confidence bounds applied to Trees

[pt] Pesquisas recentes em Virtualização de Redes focaram no problema conhecido como ossificação da Internet (Anderson et al., 2005), onde múltiplas redes virtuais (Virtual Networks - VN) independentes (Anderson et al., 2005) que exibem um alto grau de autonomia compartilham recursos físicos e podem prover serviços com diferentes graus de qualidade. Nesse sentido, pesquisas na área de Redes de Computadores e Sistemas Distribuídos deram passos evolutivos em repensar o projeto e os princípios arquiteturais de uma VN (Blumenthal e Clark, 2001) (Houidi et al., 2008). Entretanto, até onde sabemos, houve pouca investigação sobre o comportamento autonômico de tais arquiteturas (Prehofer e Bettstetters, 2005) (Movahedi et al., 2012). Sendo assim, esta pesquisa descreve uma tentativa de aplicar princípios de Sistemas Multi-Agentes (Multiagent Systems - MAS) para projetar um modelo autonômico e auto-adaptativo para o gerenciamento de redes virtuais (Virtual Networking Provisioning - VNP). Modelo esse que preenche uma lacuna na atual arquitetura da Internet. Além disso, fornecemos uma análise dos requisitos de um gerenciador auto-adaptativo para projetar um modelo autonômico confiável que é capaz de auto-organizar seus próprios recursos, sem controle, externo, para lidar com mudanças no ambiente. Tal comportamento adaptativo será necessário tendo em vista que a próxima geração da Internet está em evolução. Através da nossa avaliação, demonstramos que o modelo atinge seu propósito principal de auto-organizar uma VN eficientemente, dado que ele é capaz de antecipar cenáris críticos e executar planos adaptativos correspondentes. / [en] Recent research in Network Virtualization has focused on the Internet ossification problem (Anderson et al., 2005) whereby multiple independente virtual networks (VN) (Anderson et al., 2005) that exhibit a high degree of autonomy share physical resources and can provide services with varying degrees of quality. Thus, the Network field has taken evolutionary steps on re-thinking the design and architectural principles of VN (Blumenthal e Clark, 2001) (Houidi et al., 2008). However, to the best of our knowledge, there has been little investigation into the autonomic behaviourof such architectures (Prehofer e Bettstetter, 2005) (Movahedi et all., 2012). This paper describes na attempt to use Multiagent System (MAS) principles to design na autonomic and self-adaptative model for virtual network provisioning (VPN) that fills a gap in the current Internet architecture. In addition, we provide na analysis of the requirements of self-adaptive provisioning for designing a reliable autonomic model that is able to self-organize its own resources, with no external control, in order to cope with environment changes. Such behavior will be required as the next negeneration Internet evolves. Through our evaluation, we demonstrate that the model achieves its main purpose of efficiently self-organizing the VN, since it is able to anticipate critical scenarios and trigger corresponding adaptive plans.

[pt] Tratamento de erros em aplicações móveis sensíveis ao contexto não é uma tarefa trivial devido às características peculiares destes sistemas, como mobilidade, comunicação assíncrona e aumento de imprevisibilidade. Mecanismos convencionais de tratamento de exceções não podem ser utilizados por vários motivos. Primeiro, a propagação de erros deve considerar as mudanças contextuais que ocorrem constantemente nestes sistemas. Segundo, as atividades de recuperação de erros e a estratégia de tratamento de exceções também precisam freqüentemente ser selecionadas de acordo com as informações de contexto. Terceiro, a própria caracterização de uma exceção pode depender do contexto dos dispositivos envolvidos. Embora vários middlewares orientados a contexto ofereçam suporte ao desenvolvimento de aplicações móveis, estes sistemas raramente fornecem suporte adequado ao tratamento de exceções. Este trabalho realiza uma análise das soluções existentes para tratamento de exceções, considerando os requisitos de sensibilidade ao contexto. Além disso, são propostos um modelo para tratamento de exceções sensível ao contexto e um mecanismo implementado a partir de MoCA (Mobile Collaboration Architecture). MoCA é um middleware publish-subscribe que oferece suporte ao desenvolvimento de aplicações móveis colaborativas através da incorporação de serviços de contexto. Finalmente, este trabalho avalia o mecanismo de exceções proposto através de sua utilização em alguns protótipos de aplicações colaborativas desenvolvidas a partir de MoCA. Através do mecanismo, foram implementadas diferentes estratégias de tratamento de exceções que consideram as informações de contexto das aplicações. / [en] Context-sensitive exception handling on mobile systems is not a trivial task due to their intrinsic characteristics: mobility, asynchrony and increased unpredictability. Conventional mechanisms of exception handling can not be used for many reasons. First, error propagation needs considering the contextual changes that often occur in these systems. Second, error recovery and exception handling strategies also frequently need to be selected according to contextual information. Third, the characterization of an exception may depend on the contextual situation of involved devices. Even though there are now several context-oriented middleware systems that provide support for the development of mobile applications, they rarely provide explicit and adequate features for contextsensitive exception handling. This work presents an analysis of existing exception handling mechanisms, which to some extent consider the context-awareness requirements. Besides, it proposes a general model for context-sensitive exception handling and a supporting mechanism implemented using the MoCA (Mobile Collaboration Architecture) infrastructure. MoCA is a publish-subscribe middleware supporting the development of collaborative mobile applications by incorporating explicit services to empower software agents with contextsensitiveness. Finally, this paper reports our experience in implementing contextaware exception handling strategies in some prototype collaborative applications built with the MoCA system.

O advento da TV Digital Interativa no mundo modifica, em definitivo, a experiência do usuário em assistir a TV, tornando-a mais rica principalmente pelo uso do recurso da interatividade. Os usuários passam a ser pró-ativos e começam a interagir das mais diversas formas: construção de comunidades virtuais, discussão sobre um determinado conteúdo, envio de mensagens e recomendações, dentre outras. Neste cenário a participação dos usuários de forma colaborativa assume um papel importante e essencial. Aliado a isso, a recepção na TV Digital Interativa é feita através de dispositivos computacionais que, devido à convergência digital, estão presentes cada vez mais em meios ubíquos. Um outro fator preponderante a considerar, resultante desta mídia, corresponde ao crescimento da quantidade e diversidade de programas e serviços interativos disponíveis, dificultando, assim, a seleção de conteúdo de maior relevância. Diante dos fatos expostos, esta pesquisa tem como principal objetivo propor e implementar uma infra-estrutura de software no cenário da TV Digital Interativa intitulada CollaboraTVware para orientar, de forma transparente, os usuários na escolha de programas e serviços interativos através da participação colaborativa de outros usuários com perfis e contextos similares. No escopo deste trabalho, a participação colaborativa corresponde às avaliações atribuídas por usuários no sentido de expressar opiniões sobre os conteúdos veiculados. As modelagens de usuário, do dispositivo utilizado e do contexto da interação do usuário, essenciais para o desenvolvimento do CollaboraTVware, são representadas por padrões de metadados flexíveis usados no domínio da TV Digital Interativa (MPEG-7, MPEG-21 e TV-Anytime), e suas devidas extensões. A arquitetura do CollaboraTVware é composta por dois subsistemas: dispositivo do usuário e provedor de serviços. A tarefa de classificação, da teoria de mineração de dados, é a abordagem adotada na concepção da infra-estrutura. O conceito de perfil de uso participativo é apresentado e discutido. Para demonstrar e validar as funcionalidades do CollaboraTVware em um cenário de uso, foi desenvolvida uma aplicação (EPG colaborativo) como estudo de caso. / The advent of the Interactive Digital TV around the world transforms, ultimately, the user experience in watching TV, making it richer mainly by enabling user interactivity. The users become pro-active and begin to interact with very different ways: building virtual communities, discussion about contents, sending messages and recommendations etc. In this scenario the user participation in a collaborative assumes an important and essential role. Additionally, the reception in Interactive Digital TV is done by devices that due to digital convergence are increasingly present in ubiquitous environments. Another preponderant issue to consider, resulting from this media, is the growing of the number and diversity of programs and interactive services available, increasing the difficulty of selecting relevant content. Thus, the main objective of this work is to propose and implement a software infrastructure in an Interactive Digital Television environment entitled CollaboraTVware to guide in a transparent way, users in the choice of programs and interactive services through the collaborative participation of other users with similar profiles and contexts. In the scope of this work, the collaborative participation corresponds to the rating given by users in order to express opinions about the content transmitted. The modeling of user, device used and context of user interaction, essential for the development of CollaboraTVware, are represented by granular metadata standards used in the field of Interactive Digital TV (MPEG-7, MPEG-21 and TV-Anytime), and its extensions needed. The CollaboraTVware architecture is composed of two subsystems: user device and service provider. The classification task, from the theory of data mining, is the approach adopted in the infrastructure design. The concept of participative usage profile is presented and discussed. To demonstrate the functionalities in a use scenario, was developed an application (collaborative EPG) as a case study which uses the CollaboraTVware.

Diversos pesquisadores vêm investigando métodos e técnicas para tornar possível às pessoas anotarem vídeos de modo transparente. A anotação pode ser realizada com a fala, com o uso de tinta digital ou algum outro meio que possa ser capturado enquanto a pessoa assiste ao vídeo. Tais anotações podem ser compartilhadas com outras pessoas, que podem estar assistindo ao mesmo vídeo em um mesmo instante ou em momentos diferentes, sendo interessante ainda que as anotações possam ser realizadas por várias pessoas de modo colaborativo. O paradigma Watch-and-Comment (WaC) propõe a captura transparente de anotações multimodais de usuários enquanto os mesmos assistem e comentam um vídeo. Como resultado desse processo, é gerado um vídeo digital interativo integrando o conteúdo original às anotações realizadas. Esta dissertação tem por objetivo explorar conceitos de computação ubíqua, redes sociais, redes peer-to-peer e TV interativa na proposta de um modelo arquitetural de ciência de informações de contexto para aplicações definidas segundo o paradigma WaC. O modelo explora a integração de um serviço ao paradigma, que auxilie ou forneça alternativas para que aplicações, do momento da captura ao acesso das anotações, utilizem informações de contexto do usuário, do vídeo e das anotações. O modelo também auxilia no estudo de colaboração entre usuários que realizam anotações em vídeos. Outra contribuição da dissertação é a prototipação de aplicações para avaliar e refinar o modelo proposto. São apresentadas extensões para a aplicação WaCTool, considerando o uso de redes sociais e de alternativas para a anotação em vídeos / Researchers have been investigating methods and techniques to allow people to annotate videos ubiquitously. Annotations can be made using voice, digital ink or some other media that can be captured while a person watches a video. These annotations can be shared with other people, who can be watching a video on the same time or at a different one. Also, these annotations can be made by many people collaboratively. The Watch-and-Comment (WaC) paradigm aims at capturing multimodal annotations in an ubiquitous way, while users watch and comment some video. As a result, an interactive digital video is generated combining the original content and the annotations. The work reported on this thesis explores concepts such as ubiquitous computing, social networks, peer-to-peer networks and interactive digital TV, to propose an architectural context-aware model to the applications defined by WaC paradigm. The model proposes the integration of a new service to the paradigm, supporting applications on the annotation process by offering capture alternatives and using context information from user, video and annotations. Also, the model provides a study in collaborative annotation process. Another contribution of this thesis is the prototypes built to evaluate and upgrade the proposed model. The prototypes are extensions from WaCTool, considering the use of social networks and alternatives to annotate in videos

Recent years have seen a rapid growth in movement research owing to new technologies contributing to the miniaturization and reduced costs of tracking devices. Similar trends have occurred in how environmental data are being collected (e.g., through satellites, unmanned aerial vehicles, and sensor networks). However, the development of analytical techniques for movement research has failed to keep pace with the data collection advances. There is a need for new methods capable of integrating increasingly detailed movement data with a myriad of contextual data - termed context aware movement analysis (CAMA). CAMA investigates more than movement geometry, by including biological and environmental conditions that may influence movement. However, there is a shortage of methods relating movement patterns to contextual factors, which is still limiting our ability to extract meaningful information from movement data. This thesis contributes to this methodological research gap by assessing the state-of-the art for CAMA within movement ecology and human mobility research, developing innovative methods to consider the spatio-temporal differences between movement data and contextual data and exploring computational methods that allow identification of patterns in contextualized movement data. We developed new methods and demonstrated how they facilitated and improved the integration between high frequency tracking data and temporally dynamic environmental variables. One of the methods, multi-channel sequence analysis, is then used to discover varying human behaviour relative to weather conditions in a large human GPS tracking dataset from Scotland. The second method is developed for combing multi-sensor satellite imagery (i.e., image fusion) of differing spatial and temporal resolutions. This method is applied to a GPS tracking data on maned wolves in Brazil to understand fine-scale movement behaviours related to vegetation changes across seasons. In summary, this thesis provides a significant development in terms of new ideas and techniques for performing CAMA for human and wildlife movement studies.

Submitted by JOSIANE SANTOS DE OLIVEIRA (josianeso) on 2017-06-14T14:34:32Z No. of bitstreams: 1 Marcelo da Silva dos Santos_.pdf: 2140931 bytes, checksum: 0bda778dc68e4215cc28fb62ae63851a (MD5) / Made available in DSpace on 2017-06-14T14:34:32Z (GMT). No. of bitstreams: 1 Marcelo da Silva dos Santos_.pdf: 2140931 bytes, checksum: 0bda778dc68e4215cc28fb62ae63851a (MD5) Previous issue date: 2017-03-22 / Santander Universidades / A popularização do uso de redes sociais virtuais em camadas cada vez mais jovens da sociedade vem tornando-se parte do cotidiano. Neste sentido, surgem novas implementações de Rede Social, como a Rede Social Espontânea (RSE). Ao contrário das redes sociais tradicionais, em que as interações sociais geralmente são uma extensão de relacionamentos existentes no mundo real, uma RSE parte da premissa de que não existe necessidade de relacionamento prévio entre os participantes. Considerando que mesmo em grupos formados por participantes que se conhecem de longa data não é possível assegurar qualquer tipo de interação ativa virtual, em redes sociais espontâneas esse fato poderia tornar-se motivo para desestímulo a sua utilização. O presente trabalho tem como objetivo a construção de um modelo capaz de extrair informações de grupos utilizando redes sociais, permitindo determinar o perfil do grupo a partir das informações extraídas dos históricos contextuais dos seus usuários membros, e, com isso recomendar recursos capazes de influenciar a interação entre os membros. Nesse cenário se enquadra o INTERACT, um modelo que possui como principal contribuição científica utilizar os históricos contextuais dos usuários de uma Rede Social Espontânea ou qualquer outra rede social para incentivar interações entre seus participantes. A utilização desses históricos como recurso para potencializar interações foi identificado como um diferencial em relação aos trabalhos relacionados da área os quais, em sua maioria, empregam somente o contexto atual como forma de gerar ações pontuais e sem relacionamento com outros participantes. Para avaliação do modelo, um grupo de voluntários foi convidado a participar de um experimento onde o INTERACT interagiu com o grupo através de um personagem criado. A análise foi realizada quantitativamente e qualitativamente, através da coleta dos números gerados pelas interações entre os participantes, registro de atividades e questionários. Os resultados apontam aumento no volume de interações entre participantes nos momentos de atuação do protótipo. Os participantes ainda relataram a influência positiva das ações do personagem gerenciado pelo protótipo, reconhecido por parte do grupo como "membro" mais influente. / The popularization of the use of virtual social networks in increasingly young layers of society has become part of daily life. In this sense, new implementations of Social Network, such as the Spontaneous Social Network (SSN), emerge. Unlike traditional social networks, where social interactions are often an extension of existing relationships in the real world, SSN starts from the premise that there is no need for prior relationships between participants. Considering that even in groups formed by participants that are known for a long time it is not possible to assure any kind of virtual active interaction, in spontaneous social networks this fact could become reason to discourage its use. The objective of this work is the construction of a model capable of extracting information from groups using social networks, allowing determining the profile of the group from the information extracted from the contextual histories of its member users, and with this to recommend resources capable of influencing the Interaction between members. In this scenario, INTERACT is a model that has as main scientific contribution to use the contextual histories of the users of a Spontaneous Social Network or any other social network to encourage interactions among its participants. The use of historical as a resource to enhance the interactions was identified as a difference in relation to the works related to the areas of which, for the most part, only use the current context as a way to generate punctual actions and without relationship with other participants. For the evaluation of the model, a group of volunteers was invited to participate in an experiment in which INTERACT interacted with the group through a person created. The analysis was performed quantitatively and qualitatively, through the collection of numbers generated in interactions among the participants, activity records and questionnaires. The results indicate an increase in the volume of interactions between the participants in the moments of performance of the prototype. The participants also reported a positive influence of the actions of the person managed by the prototype, recognized by the group as a influential "member".