Dissertations / Theses: 'Ubiquitous services'

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Leung, Adrian Ho Yin. "Securing mobile ubiquitous services trusted computing." Thesis, Royal Holloway, University of London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.537518.

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Pakkala, Daniel. "Lightweight distributed service platform for adaptive mobile services /." Espoo [Finland] : VTT Technical Research Centre of Finland, 2004. http://www.vtt.fi/inf/pdf/publications/2004/P519.pdf.

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Nylander, Stina. "The ubiquitous interactor : Mobile services with multiple user interfaces." Licentiate thesis, Uppsala : Univ. : Dept. of Information Technology, Univ, 2003. http://www.it.uu.se/research/reports/lic/2003-013/.

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Di, Giovanni Pasquale. "Enhancing Ubiquitous Computing Environments Through Composition of Heterogeneous Services." Doctoral thesis, Universita degli studi di Salerno, 2016. http://hdl.handle.net/10556/2231.

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2012 - 2013
In recent years the substantial advancements in Information and Communication Technologies enabled the development of original software solutions that can provide support to problems people face in their daily activities. Among the technical advancements that have fostered the development of such innovative applications, the gradual transition from stand-alone and centralized architectures to distributed ones and the explosive growth in the area of mobile communication have played a central role. The pro table combination of these advancements has led to the rise of the so-called Mobile Information Systems. Unfortunately, ful lling such a type of systems is very challenging and several aspects have to be taken into account during the design and development of both the front and back ends of the proposed solution. Within this context in this thesis we investigate two main aspects: 1) the elicitation of requirements and the design of usable mobile User Interfaces and 2) the information exchange in a back end combining heterogeneous services, more speci cally services based on the standards of the World Wide Web (W3C) and Open Geospatial Consortium (OGC). In particular, we develop a methodology to support the design of mobile solutions when usability requirements play a key role for the success of the whole system. We also present a solution for a seamless integration of services developed according to di erent standards with speci c focus on the issue of proper management of geospatial metadata in a W3C standards-oriented infrastructure. The result of our investigation is an extension for a key W3C standard for the metadata retrieval to support OGC metadata. The case study considered in our work is a Mobile Information System to be used by a community of farmers in Sri Lanka. [edited by Author]
XII n.s.

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Beltrán, Martínez Victoria. "Contributions to presence-based systems for deploying ubiquitous communication services." Doctoral thesis, Universitat Politècnica de Catalunya, 2011. http://hdl.handle.net/10803/131274.

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Next-Generation Networks (NGNs) will converge the existing fixed and wireless networks. These networks rely on the IMS (IP Multimedia Subsystem), introduced by the 3GPP. The presence service came into being in instant messaging applications. A user¿s presence information consists in any context that is necessary for applications to handle and adapt the user's communications. The presence service is crucial in the IMS to deploy ubiquitous services. SIMPLE is the standard protocol for handling presence and instant messages. This protocol disseminates users' presence information through subscriptions, notifications and publications. SIMPLE generates much signaling traffic for constantly disseminating presence information and maintaining subscriptions, which may overload network servers. This issue is even more harmful to the IMS due to its centralized servers. A key factor in the success of NGNs is to provide users with always-on services that are seamlessly part of their daily life. Personalizing these services according to the users' needs is necessary for the success of these services. To this end, presence information is considered as a crucial tool for user-based personalization. This thesis can be briefly summarized through the following contributions: We propose filtering and controlling the rate of presence publications so as to reduce the information sent over access links. We probabilistically model presence information through Markov chains, and analyzed the efficiency of controlling the rate of publications that are modeled by a particular Markov chain. The reported results show that this technique certainly reduces presence overload. We mathematically study the amount of presence traffic exchanged between domains, and analyze the efficiency of several strategies for reducing this traffic. We propose an strategy, which we call Common Subscribe (CS), for reducing the presence traffic exchanged between federated domains. We compare this strategy traffic with that generated by other optimizations. The reported results show that CS is the most efficient at reducing presence traffic. We analyze the load in the number of messages that several inter-domain traffic optimizations cause to the IMS centralized servers. Our proposed strategy, CS, combined with an RLS (i.e., a SIMPLE optimization) is the only optimization that reduces the IMS load; the others increase this load. We estimate the efficiency of the RLS, thereby concluding that the RLS is not efficient under certain circumstances, and hence this optimization is discouraged. We propose a queuing system for optimizing presence traffic on both the network core and access link, which is capable to adapt the publication and notification rate based on some quality conditions (e.g, maximum delay). We probabilistically model this system, and validate it in different scenarios. We propose, and implement a prototype of, a fully-distributed platform for handling user presence information. This approach allows integrating Internet Services, such as HTTP or VoIP, and optimizing these services in an easy, user-personalized way. We have developed SECE (Sense Everything, Control Everything), a platform for users to create rules that handle their communications and Internet Services proactively. SECE interacts with multiple third-party services for obtaining as much user context as possible. We have developed a natural-English-like formal language for SECE rules. We have enhanced SECE for discovering web services automatically through the Web Ontology Language (OWL). SECE allows composing web services automatically based on real-world events, which is a significant contribution to the Semantic Web. The research presented in this thesis has been published through 3 book chapters, 4 international journals (3 of them are indexed in JCR), 10 international conference papers, 1 demonstration at an international conference, and 1 national conference
Next-Generation Networks (NGNs) son las redes de próxima generación que soportaran la convergencia de redes de telecomunicación inalámbricas y fijas. La base de NGNs es el IMS (IP Multimedia Subsystem), introducido por el 3GPP. El servicio de presencia nació de aplicaciones de mesajería instantánea. La información de presencia de un usuario consiste en cualquier tipo de información que es de utilidad para manejar las comunicaciones con el usuario. El servicio de presencia es una parte esencial del IMS para el despliegue de servicios ubicuos. SIMPLE es el protocolo estándar para manejar presencia y mensajes instantáneos en el IMS. Este protocolo distribuye la información de presencia de los usuarios a través de suscripciones, notificaciones y publicaciones. SIMPLE genera mucho tráfico por la diseminación constante de información de presencia y el mantenimiento de las suscripciones, lo cual puede saturar los servidores de red. Este problema es todavía más perjudicial en el IMS, debido al carácter centralizado de sus servidores. Un factor clave en el éxito de NGNs es proporcionar a los usuarios servicios ubicuos que esten integrados en su vida diaria y asi interactúen con los usuarios constantemente. La personalización de estos servicios basado en los usuarios es imprescindible para el éxito de los mismos. Para este fin, la información de presencia es considerada como una herramienta base. La tesis realizada se puede resumir brevemente en los siguientes contribuciones: Proponemos filtrar y controlar el ratio de las publicaciones de presencia para reducir la cantidad de información enviada en la red de acceso. Modelamos la información de presencia probabilísticamente mediante cadenas de Markov, y analizamos la eficiencia de controlar el ratio de publicaciones con una cadena de Markov. Los resultados muestran que este mecanismo puede efectivamente reducir el tráfico de presencia. Estudiamos matemáticamente la cantidad de tráfico de presencia generada entre dominios y analizamos el rendimiento de tres estrategias para reducir este tráfico. Proponemos una estrategia, la cual llamamos Common Subscribe (CS), para reducir el tráfico de presencia entre dominios federados. Comparamos el tráfico generado por CS frente a otras estrategias de optimización. Los resultados de este análisis muestran que CS es la estrategia más efectiva. Analizamos la carga en numero de mensajes introducida por diferentes optimizaciones de tráfico de presencia en los servidores centralizados del IMS. Nuestra propuesta, CS, combinada con un RLS (i.e, una optimización de SIMPLE), es la unica optimización que reduce la carga en el IMS. Estimamos la eficiencia del RLS, deduciendo que un RLS no es eficiente en ciertas circunstancias, en las que es preferible no usar esta optimización. Proponemos un sistema de colas para optimizar el tráfico de presencia tanto en el núcleo de red como en la red de acceso, y que puede adaptar el ratio de publicación y notificación en base a varios parametros de calidad (e.g., maximo retraso). Modelamos y analizamos este sistema de colas probabilísticamente en diferentes escenarios. Proponemos una arquitectura totalmente distribuida para manejar las información de presencia del usuario, de la cual hemos implementado un prototipo. Esta propuesta permite la integracion sencilla y personalizada al usuario de servicios de Internet, como HTTP o VoIP, asi como la optimizacón de estos servicios. Hemos desarrollado SECE (Sense Everything, Control Everything), una plataforma donde los usuarios pueden crear reglas para manejar todas sus comunicaciones y servicios de Internet de forma proactiva. SECE interactúa con una multitud de servicios para conseguir todo el contexto possible del usuario. Hemos desarollado un lenguaje formal que parace como Ingles natural para que los usuarios puedan crear sus reglas. Hemos mejorado SECE para descubrir servicios web automaticamente a través del lenguaje OWL (Web Ontology Language).

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Clark, R. J. (Russell J. ). "Solutions for ubiquitous information services : multiple protocols and scalable servers." Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/8489.

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Fekih, Hassen Wiem. "A ubiquitous navigation service on smartphones." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI006.

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La navigation pédestre est un domaine de recherche en pleine croissance qui vise à développer des services assurant le positionnement et la navigation en continu des personnes à l'extérieur comme à l'intérieur de bâtiments. Dans cette thèse, nous proposons un prototype de service pour la navigation pédestre ubiquitaire qui tient compte des préférences de l'utilisateur et de la technologie de positionnement optimale disponible. Notre objectif principal est d'estimer, d'une façon continue, la position d'un piéton muni d'un smartphone. En premier lieu, nous proposons un nouvel algorithme, nommé UCOSA, qui permet de sélectionner la technologie de positionnement à adopter à tout moment le long du processus de navigation. L'algorithme UCOSA commence par inférer la nécessité de déclencher un processus de "handover" (changement de technologie) entre les technologies de positionnement détectées (i.e. quand les zones de couvertures se chevauchent) en utilisant la technique de la logique floue. Ensuite, il sélectionne la technologie optimale à l'aide d'une fonction qui calcule un score pour chaque technologie disponible et qui se compose de deux parties. La première partie représente les poids, calculés en utilisant la méthode d'analyse hiérarchique (AHP). Tandis que, la deuxième partie fournit les valeurs normalisées des paramètres considérés. L'algorithme UCOSA intègre aussi la technique de positionnement à l'estime appelé PDR afin d'améliorer le calcul de la position du smartphone. En second lieu, nous portons l'intérêt à la technique de positionnement par empreintes RSS dont le principe consiste à calculer la position du smartphone en comparant les valeurs RSSs enregistrées, en temps réel, avec les valeurs RSSs stockées dans une base de données (radiomap). La majorité des radiomaps sont représentées sous forme de grilles composées de points de référence (PR). Nous proposons une nouvelle conception de radiomap qui ajoute d'autres PRs au centre de gravité de chaque carré de la grille. En troisième lieu, nous abordons le problème de la construction du graphe modélisant un bâtiment multi-étages. Nous proposons un algorithme qui crée tout d'abord un graphe plan pour chaque étage, séparément, et qui relie ensuite les différents étages par des liens verticaux. En dernier lieu, nous étudions un nouvel algorithme nommé SIONA qui calcule et qui affiche d'une manière continue le chemin entre deux points situés à l'intérieur ou à l'extérieur d'un bâtiment. Plusieurs expériences réelles ont été réalisées pour évaluer les performances des algorithmes proposés avec des résultats prometteurs en termes de continuité et de précision (de l'ordre de 1.8 m) du service de navigation
Pedestrian navigation is a growing research field, which aims at developing services and applications that ensure the continuous positioning and navigation of people inside and outside covered areas (e.g. buildings). In this thesis, we propose a ubiquitous pedestrian navigation service based on user preferences and the most suitable efficient available positioning technology (e.g. WiFi, GNSS). Our main objective is to estimate continuously the position of a pedestrian carrying a smartphone equipped with a variety of technologies and sensors. First, we propose a novel positioning technology selection algorithm, called UCOSA for the complete ubiquitous navigation service in indoor and outdoor environments. UCOSA algorithm starts by inferring the need of a handover between the available positioning technologies on the overlapped coverage areas using fuzzy logic technique. If a handover process is required, a score is calculated for each captured Radio Frequency (RF) positioning technology. The score function consists of two parts: the first part represents the user preferences weights computed based on the Analytic Hierarchy Process (AHP). Whereas, the second part provides the user requirements (normalized values). UCOSA algorithm also integrates the Pedestrian Dead Reckoning (PDR) positioning technique through the navigation process to enhance the estimation of the smartphone's position. Second, we focus on the RSS fingerprinting positioning technique as it is the most widely used technique, which principle is to return the smartphone's position by comparing the real time recorded RSS values with the radiomap (i.e. a database of previous stored RSS values). Most of radiomap are organized in a grid, formed or Reference Point (RP): we propose a new design of radiomap which complements the grid with other RPs located at the center of gravity of each grid square. Third, we address the challenge of constructing a graph for a multi-floor building. We propose an algorithm that starts by creating the horizontal graph of each floor, separately, and then, adds vertical links between the different floors. Finally, we implement a novel algorithm, called SIONA that calculates and displays in a continuous manner the pathway between two distinct points being located indoor or outdoor. We conduct several real experiments inside the campus of the University of Passau in Germany to evaluate the performance of the proposed algorithms. They yield promising results in terms of continuity and accuracy (around 1.8 m indoor) of navigation service

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Santos, Pedro Emanuel Albuquerque e. Baptista dos. "Personalization platform for multimodal ubiquitous computing applications." Master's thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/11063.

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Dissertação para obtenção do Grau de Mestre em Engenharia Informática
We currently live surrounded by a myriad of computing devices running multiple applications. In general, the user experience on each of those scenarios is not adapted to each user’s specific needs, without personalization and integration across scenarios. Moreover, developers usually do not have the right tools to handle that in a standard and generic way. As such, a personalization platform may provide those tools. This kind of platform should be readily available to be used by any developer. Therefore, it must be developed to be available over the Internet. With the advances in IT infrastructure, it is now possible to develop reliable and scalable services running on abstract and virtualized platforms. Those are some of the advantages of cloud computing, which offers a model of utility computing where customers are able to dynamically allocate the resources they need and are charged accordingly. This work focuses on the creation of a cloud-based personalization platform built on a previously developed generic user modeling framework. It provides user profiling and context-awareness tools to third-party developers. A public display-based application was also developed. It provides useful information to students, teachers and others in a university campus as they are detected by Bluetooth scanning. It uses the personalization platform as the basis to select the most relevant information in each situation, while a mobile application was developed to be used as an input mechanism. A user study was conducted to assess the usefulness of the application and to validate some design choices. The results were mostly positive.

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Lui, Siu Man. "Impacts of information technology commoditization : selected studies from ubiquitous information services /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?ISMT%202005%20LUI.

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Sumter, George C. (George Cody). "Privacy preservation and auditing for ubiquitous mobile sensing applications and services." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/78501.

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Thesis (S.M. in Technology and Policy)--Massachusetts Institute of Technology, Engineering Systems Division, 2012.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 77-79).
The recent proliferation of mobile phones, with their many associated sensors, has opened the door to an entirely new range of insights and applications with a host of accompanying privacy concerns. In this thesis, we explore techniques for privacy preservation, transparency, and auditing for mobile sensing applications and services. We demonstrate the feasibility of privacy-conscious defaults with the deployment of an open-source mobile sensing framework and examine the requirements for this as a basis of a forced-transparency system. This system is then examined within the scope of present legal and policy frameworks and assessed for use in both open and closed source mobile sensing platforms and frameworks. Finally, we highlight the use of a mobile application prototyping service as a means for early trend detection for future privacy research.
by George C. Sumter.
S.M.in Technology and Policy

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Perez, Alfredo Jose. "An Architecture for Global Ubiquitous Sensing." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3276.

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A new class of wireless sensor networks has recently appeared due to the pervasiness of cellular phones with embedded sensors, mobile Internet connectivity, and location technologies. This mobile wireless sensor network has the potential to address large-scale societal problems and improve the people's quality of life in a better, faster and less expensive fashion than current solutions based on static wireless sensor networks. Ubiquitous Sensing is the umbrella term used in this dissertation that encompasses location-based services, human-centric, and participatory sensing applications. At the same time, ubiquitous sensing applications are bringing a new series of challenging problems. This dissertation proposes and evaluates G-Sense, for Global-Sense, an architecture that integrates mobile and static wireless sensor networks, and addresses several new problems related to location-based services, participatory sensing, and human-centric sensing applications. G-Sense features the critical point algorithms, which are specific mechanisms to reduce the power consumption by continous sensing applications in cellular phones, and reduce the amount of data generated by these applications. As ubiquitous sensing applications have the potential to gather data from many users around the globe, G-Sense introduces a peer-to-peer system to interconnect sensing servers based on the locality of the data. Finally, this dissertation proposes and evaluates a multiobjective model and a hybrid evolutionary algorithm to address the efficient deployment of static wireless sensor nodes when monitoring critical areas of interest.

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Guenkova-Luy, Teodora. "Multimedia networking coordination of multimedia services in next generation mobile networks." Saarbrücken VDM, Müller, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=3037222&prov=M&dok_var=1&dok_ext=htm.

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Balegh, Walid. "Communication and Adaptation in a Ubiquitous Environment." Thesis, Linnéuniversitetet, Institutionen för datavetenskap och medieteknik (DM), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-76624.

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Context awareness means sending the right information to the right user at the righttime. Context is our environment, which can be anything around us such as location,lights, noises etc. To make the context interact with our mobile devices or sensors,there must be protocols for communication and data formats for the “sent” or “received”contextual information so we can give very specific context information tothe user. Since this communication and adaptive part is not well understood, in thispaper we are interested in investigating the technology used for adaptation. We willalso explain how this technology works to adapt itself to changes in the environment.

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Laverton, Christian. "Social Tagging of Services to Support End User Development in Ubiquitous Collaborative Environments." Thesis, Norwegian University of Science and Technology, Department of Computer and Information Science, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9581.

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Tailorability in ubiquitous computing systems is needed at different levels, depending on the targeted end users. For inexperienced end users lacking computer competency, high level mechanisms for tailoring are needed. Systems such as ASTRA, which use a service oriented architecture, can provide such high level tailorability through service composition. With service composition, services can be combined and configured to form applications. However, using service composition introduces new challenges for end users. To find appropriate services, users need mechanisms for searching and browsing services. Equally important is it that users are able to understand how services work and what functionality they offer. Service descriptions can ease this task, but the problem with existing approaches to service descriptions is that they are not intended for end users and are hard to understand. This work looks at social tagging, which is a collaborative process where users attach labels or tags to items. This leads to user created metadata, as opposed to metadata created by experts. By introducing social tagging in ASTRA to describe services, users are provided with a framework for sharing their understanding of services with fellow users. To create a solution for social tagging for service descriptions, a thorough problem analysis was performed. The analysis considered the design space of tagging systems to find appropriate design choices in the problem context. Providing several tag visibility levels was identified as important, especially community tagging. The quality of tags as seen from the community members' perspective is likely to increase, as members of communities often share similar opinions and understandings. An important difference identified between existing tagging systems and tagging of services is that services can be embedded in physical devices. Thus, services can be discovered and accessed physically, which means that physical access to the services' tags should be supported. A requirements specification for a tagging system was specified, focusing on the platform requirements for basic tagging mechanisms, tag based navigation, and searching. The requirements lead to a design of platform architecture, aiming at extending the UbiCollab platform with social tagging functionality. The architecture uses a client/server solution, where the server service is shared among a network of users and handles public and community level tags. The client service is a local service which handles private tags, and acts as an intermediary between end user tools and the server service. A prototype of the platform services and an end user tool was implemented. The implementation is demonstrated through scenarios, showing possible uses of the tagging system.

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Papadopoulos, Homer. "Use of multimedia services within ubiquitous environments : the role of place in the usage process of mobile data services." Thesis, University of Bath, 2009. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.505711.

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Recently, there have been rapid developments in the fields of mobile and wireless technologies which have enabled the acquisition of information at anytime regardless of the location and mobility status of the users. However, despite the increasing popularity of mobile devices which are becoming an indispensable part of our everyday activities, the disappointing results regarding the adoption and use of mobile applications and data services lead scholars to question the understanding of the adoption and usage behaviour within these new wireless environments. The author believes that there could be attributes which are still unexplored and could provide an explanation why the mobile data services are still unsuccessful. The aim of this study is to explore, understand and highlight the role of place in the decision of the people to use mobile data services and thus to assist professionals and scholars to consider the importance of the attributes of place in the design of new applications and in the adoption and usage models of mobile technologies and services. In order to achieve this objective an exploratory in nature research was conducted combining conventional and innovative research methodologies. A model of place was generated which served as a sensitizing device in order to interpret, and analyse the collected data. The first phase of this research involved the understanding of the market in question and the selection of the appropriate case (mobile data services platform) to conduct the research. The second main phase of the research then sought to get a better understanding of how users experience place before deciding to use mobile data services. The research methods were applied within everyday settings with 30 users of the selected mobile data services platform, all of whom were selected according to specific criteria. The findings tend to suggest that participants did experience the different places in a similar way before deciding to use mobile data services.

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Shaheed, Amjad. "A framework for the visualisation and control of ubiquitous devices, services and digital content." Thesis, Liverpool John Moores University, 2011. http://researchonline.ljmu.ac.uk/6018/.

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The General Organization for Technical Education and Vocational Training, Riyadh, Saudi Arabia, has developed a special feeding program for the students at its institutions. The effects of this program on the nutritional and health status of these students have not been evaluated yet, and since no published dietary research has been performed on Technical and Vocational young adult male students, the present work was undertaken to investigate the nutritional status of this community in Riyadh, Kingdom of Saudi Arabia. After a pilot survey, it was decided to use a selfcompleted questionnaire combined with personal interview to investigate the nutritional status of 690 students randomly selected from the study population. Dietary data was collected by two methods: usual weekly intakes "diet history" and actual daily intakes "diet diary". The nutrient intakes were calculated using the unilever Dietary Analysis Program (UNIDAP). The statistical Package for the social Science (SPSS/PC+) was employed to analyse the data; statistical significance of relationships between certain sets of data was determined by chi-square analysis. Some general factors affecting the nutritional status of these students were identified, their nutritional habits and attitudes were investigated, and the average daily intakes of energy, the macronutrients, and selected micronutrients were calculated. The main results of this study shows that the majority of the study population are adolescent, moderately active individuals, and have lower than the standard range of the Body Mass Index; anaemia is the most stated health problem; meal-skipping and eating between meals are common habits amongst the students. Regarding nutrient intake, there was an energy, polyunsaturated fat, and vitamin C deficiency; adequate intake of saturated fat, dietary fibre, retinol, and zinc; more than adequate intake of protein, total fat, cholesterol, thiamin, riboflavin, calcium, and iron. Recommendations are given which aim to improve the nutrition of technical and vocational students.

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Frigui, Soumaya <1985&gt. "The Ubiquitous Role of New Social Media Channels and Innovative Mobile Services: Are Consumers Ready?" Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7374/1/Tesi_def._Frigui_Soumaya.pdf.

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Over the past decade, the world of social media is evolving at warp speed. In light of this rapid evolution, investigating social media users behaviour is top of the agenda for many managers and marketing researchers today (Kaplanand Haenlein, 2010). Indeed, still there are several areas in which we believe social media channels such as social networking, e-commerce, s-commerce, and blogs will make the most trivial evolution in years to come. Given the background provided about social media platforms adoption and strategic usage, there are some interesting and relevant topics that are particularly relevant in research on consumer behaviour towards these geo-information platforms and await further empirical exploration. Firstly, considering the cross-cultural aspects in studying the LBSN adoption on mobile phones, in a relationship social context, is a key driver of the growth and success of mobile LBSN and is even crucial to telecommunication operators to implement these services. Secondly, recently s-commerce is considered as a new form of social media that has arisen which due to its social features seem to have a great power of influence on consumers’ purchasing decision-making process. The marketing area has thus evolved from a time where marketers had the power of influence to today where consumers have a greater power of influence on their peers (Jaffe, 2010). Finally, with the advent of 4G mobile devices and the mobile location based advertising, consumers’ preferences can be pre-identified and advertising content can therefore be delivered to consumers at the right time and at the right place with the right message (Chen and Hsieh, 2012). Therefore, it becomes necessary and reasonable to enhance our understanding about the role of mobile advertising in mediating consumers shopping experience, since we begin to find ourselves bringing our mobile devices everywhere we go.

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Frigui, Soumaya <1985&gt. "The Ubiquitous Role of New Social Media Channels and Innovative Mobile Services: Are Consumers Ready?" Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7374/.

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Over the past decade, the world of social media is evolving at warp speed. In light of this rapid evolution, investigating social media users behaviour is top of the agenda for many managers and marketing researchers today (Kaplanand Haenlein, 2010). Indeed, still there are several areas in which we believe social media channels such as social networking, e-commerce, s-commerce, and blogs will make the most trivial evolution in years to come. Given the background provided about social media platforms adoption and strategic usage, there are some interesting and relevant topics that are particularly relevant in research on consumer behaviour towards these geo-information platforms and await further empirical exploration. Firstly, considering the cross-cultural aspects in studying the LBSN adoption on mobile phones, in a relationship social context, is a key driver of the growth and success of mobile LBSN and is even crucial to telecommunication operators to implement these services. Secondly, recently s-commerce is considered as a new form of social media that has arisen which due to its social features seem to have a great power of influence on consumers’ purchasing decision-making process. The marketing area has thus evolved from a time where marketers had the power of influence to today where consumers have a greater power of influence on their peers (Jaffe, 2010). Finally, with the advent of 4G mobile devices and the mobile location based advertising, consumers’ preferences can be pre-identified and advertising content can therefore be delivered to consumers at the right time and at the right place with the right message (Chen and Hsieh, 2012). Therefore, it becomes necessary and reasonable to enhance our understanding about the role of mobile advertising in mediating consumers shopping experience, since we begin to find ourselves bringing our mobile devices everywhere we go.

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Rieger, Andreas Verfasser], and Sahin [Akademischer Betreuer] [Albayrak. "Framework for Building Situation-Aware Ubiquitous Services in Smart Home Environments / Andreas Rieger. Betreuer: Sahin Albayrak." Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2011. http://d-nb.info/1014946840/34.

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García, Davis Ernesto J. "Contribution to the publish/subscribe communication model for the development of ubiquitous services in wireless sensor networks." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/667126.

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Advances in wireless technologies and the rapid development of integrated electronics have made wireless sensor networks (WSN) one of the key technologies of the Internet of Things (IoT). Thanks to the ability of these networks to measure the physical phenomena of their environment, process and communicate this information using wireless technologies, they have excelled in the development of applications that respond or adapt to the context of a user, as is the case of ubiquitous environments such as smart cities, industrial automation, e-health among others. In addition, the IoT has opened the possibility that intelligent objects or devices are also capable of exchanging status information, conditions and capacity in order to interact with each other, in the same way that human beings have done through systems based on presence. These systems require information of an event in real time to react in a timely manner to the conditions or context of the user or device. These applications open new challenges in the management of WSN resources, since these networks operate in environments that are generally prone to packet loss and consist of generally small nodes with limited resources in memory, processing, bandwidth and power. The main objective of this thesis is the development of several mechanisms that allow the adaptation of the Publish/Subscribe protocols to the characteristics and limitations of the WSN for the provision of ubiquitous services in the context of the IoT. In addition, QoS support is supplied through mechanisms that provide reliability and timeliness in the delivery of packets and data aggregation techniques are applied to be efficient in the power consumption and the WSN bandwidth. Our research proposes an architecture to provide a presence service for WSN based on a Publish/ Subscribe model distributed and focused on mechanisms such as the aggregation of data and the publication of messages on demand to achieve energy efficiency and bandwidth. All these mechanisms have been applied in the design of a system called PASH aimed at home control based on the concept of Ambient Assisted Living (AAL). The reliability provided by Publish/Subscribe protocols in WSN is of great importance in the design of applications that require receiving a message to react on time or in real time to an event. Initially, we focused our study on increasing the proportion of packet delivery (PDR) in the destination node through the improvement of reliability mechanisms. We evaluated the reliability mechanism of the MQTT-SN protocol and several proposed mechanisms of the CoAP protocol. From this evaluation, we propose a new and simple adaptive retransmission mechanism to respond to packet loss in the most appropriate way. Finally, we consider that applications such as: e-health, critical infrastructure control and monitoring, among others, must meet different QoS requirements, such as reliability and timeliness for each type of message received. In addition, data aggregation techniques play an important role in WSN to reduce power consumption and bandwidth. In this thesis, we propose a mechanism that provides the application with three different levels of QoS: we provide an improvement of our previous relay mechanism for reliability, we include the data aggregation in our reliability mechanism and we provide a timeliness mechanism in the delivery of packets.
Els avenços en les tecnologies sense fils i al ràpid desenvolupament de l'electrònica integrada, ha convertit les xarxes de sensors sense fils (WSN) en una de les tecnologies claus de l'Internet de les Coses (Iot). Gràcies a la capacitat que tenen aquestes xarxes de mesurar els fenòmens físics del seu entorn, processar i comunicar aquesta informació utilitzant tecnologies sense fils, s'han destacat en el desenvolupament d'aplicacions que responguin o s'adaptin al context d'un usuari, com és el cas dels entorns ubics com a ciutats intel·ligents, automatització industrial, salut electrònica entre d'altres. A més, el IOT ha obert la possibilitat que els objectes o dispositius intel·ligents també siguin capaços d'intercanviar informació d'estat, condicions i capacitat per tal d'interactuar entre si, de la mateixa manera que els éssers humans ho han fet a través de sistemes basats en presència. Aquests sistemes requereixen informació d'un esdeveniment en temps real per reaccionar de manera oportuna a les condicions o al context de l'usuari o dispositiu. Aquestes aplicacions obren nous desafiaments en l'administració dels recursos de WSN, ja que aquestes xarxes operen en entorns que generalment són propensos a la pèrdua de paquets i consten de nodes generalment petits amb recursos limitats en memòria, processament, ample de banda i alimentació. El principal objectiu d'aquesta tesi és el desenvolupament de diversos mecanismes que permetin l'adequació dels protocols d'Publish / Subscribe a les característiques i limitacions de la WSN per a la provisió de serveis ubics en el context de la IOT. A més, es brinda suport de QoS a través de mecanismes que proporcionen fiabilitat i puntualitat en el lliurament de paquets i s'apliquen tècniques d'agregació de dades per a ser eficients en el consum d'energia i l'ample de banda de la WSN. La nostra investigació proposa una arquitectura per a proporcionar un servei de presència per WSN basat en un model de Publish / Subscribe distribuït i centrat en mecanismes com ara l'agregació de dades i la publicació de missatges en demanda per aconseguir eficiència en l'energia i l'ample de banda . Tots aquests mecanismes han estat aplicats en el disseny d'un sistema anomenat Pash dirigit al control de la llar basat en el concepte de Vida Assistida (AAL). La fiabilitat proporcionada pels protocols de Publish / Subscribe WSN és de gran importància en el disseny d'aplicacions que requereixen rebre un missatge per reaccionar a temps o en temps real davant un esdeveniment. Inicialment enfoquem el nostre estudi en augmentar la proporció de lliurament de paquets (PDR) en el node de destinació a través de la millora dels mecanismes de fiabilitat. Avaluem el mecanisme de fiabilitat del protocol MQTT-SN i diversos mecanismes proposats del protocol COAP. A partir d'aquesta avaluació, proposem un nou i senzill mecanisme de retransmissió adaptable per respondre a la pèrdua de paquets de la manera més adequada. Finalment, considerem que les aplicacions com: salut electrònica, control d'infraestructura crítica i monitoratge, entre d'altres, han de complir diferents requisits de QoS, com la fiabilitat i la puntualitat per a cada tipus de missatge rebut. A més, les tècniques d'agregació de dades tenen un paper important en WSN per reduir el consum d'energia i l'ample de banda. En aquesta tesi, proposem un mecanisme que proporciona a la aplicació tres nivells de QoS diferents: proporcionem una millora del nostre mecanisme de retransmissió anterior per a la fiabilitat, incloem l'agregació de dades en el nostre mecanisme de fiabilitat i proporcionem un mecanisme de puntualitat en el lliurament de paquets.

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21

Wullems, Christian John. "Engineering Trusted Location Services and Context-aware Augmentations for Network Authorization Models." Thesis, Queensland University of Technology, 2005. https://eprints.qut.edu.au/16707/1/Christian_Wullems_Thesis.pdf.

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Context-aware computing has been a rapidly growing research area, however its uses have been predominantly targeted at pervasive applications for smart spaces such as smart homes and workplaces. This research has investigated the use of location and other context data in access control policy, with the purpose of augmenting existing IP and application-layer security to provide fine-grained access control and effective enforcement of security policy. The use of location and other context data for security purposes requires that the technologies and methods used for acquiring the context data are trusted. This thesis begins with the description of a framework for the analysis of location systems for use in security services and critical infrastructure. This analysis classifies cooperative locations systems by their modes of operation and the common primitives they are composed of. Common location systems are analyzed for inherent security flaws and limitations based on the vulnerability assessment of location system primitives and the taxonomy of known attacks. An efficient scheme for supporting trusted differential GPS corrections is proposed, such that DGPS vulnerabilities that have been identified are mitigated. The proposal augments the existing broadcast messaging protocol with a number of new messages facilitating origin authentication and integrity of broadcast corrections for marine vessels. A proposal for a trusted location system based on GSM is presented, in which a model for tamper resistant location determination using GSM signaling is designed. A protocol for association of a user to a cell phone is proposed and demonstrated in a framework for both Web and Wireless Application Protocol (WAP) applications. After introducing the security issues of existing location systems and a trusted location system proposal, the focus of the thesis changes to the use of location data in authorization and access control processes. This is considered at both the IP-layer and the application-layer. For IP-layer security, a proposal for location proximity-based network packet filtering in IEEE 802.11 Wireless LANs is presented. This proposal details an architecture that extends the Linux netfilter system to support proximity-based packet filtering, using methods of transparent location determination through the application of a pathloss model to raw signal measurements. Our investigation of application-layer security resulted in the establishment of a set of requirements for the use of contextual information in application level authorization. Existing network authentication protocols and access control mechanisms are analyzed for their ability to fulfill these requirements and their suitability in facilitating context-aware authorization. The result is the design and development of a new context-aware authorization architecture, using the proposed modifications to Role-based Access Control (RBAC). One of the distinguishing characteristics of the proposed architecture is its ability to handle authorization with context-transparency, and provide support for real-time granting and revocation of permissions. During the investigation of the context-aware authorization architecture, other security contexts in addition to host location were found to be useful in application level authorization. These included network topology between the host and application server, the security of the host and the host execution environment. Details of the prototype implementation, performance results, and context acquisition services are presented.

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22

Wullems, Christian John. "Engineering Trusted Location Services and Context-aware Augmentations for Network Authorization Models." Queensland University of Technology, 2005. http://eprints.qut.edu.au/16707/.

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Context-aware computing has been a rapidly growing research area, however its uses have been predominantly targeted at pervasive applications for smart spaces such as smart homes and workplaces. This research has investigated the use of location and other context data in access control policy, with the purpose of augmenting existing IP and application-layer security to provide fine-grained access control and effective enforcement of security policy. The use of location and other context data for security purposes requires that the technologies and methods used for acquiring the context data are trusted. This thesis begins with the description of a framework for the analysis of location systems for use in security services and critical infrastructure. This analysis classifies cooperative locations systems by their modes of operation and the common primitives they are composed of. Common location systems are analyzed for inherent security flaws and limitations based on the vulnerability assessment of location system primitives and the taxonomy of known attacks. An efficient scheme for supporting trusted differential GPS corrections is proposed, such that DGPS vulnerabilities that have been identified are mitigated. The proposal augments the existing broadcast messaging protocol with a number of new messages facilitating origin authentication and integrity of broadcast corrections for marine vessels. A proposal for a trusted location system based on GSM is presented, in which a model for tamper resistant location determination using GSM signaling is designed. A protocol for association of a user to a cell phone is proposed and demonstrated in a framework for both Web and Wireless Application Protocol (WAP) applications. After introducing the security issues of existing location systems and a trusted location system proposal, the focus of the thesis changes to the use of location data in authorization and access control processes. This is considered at both the IP-layer and the application-layer. For IP-layer security, a proposal for location proximity-based network packet filtering in IEEE 802.11 Wireless LANs is presented. This proposal details an architecture that extends the Linux netfilter system to support proximity-based packet filtering, using methods of transparent location determination through the application of a pathloss model to raw signal measurements. Our investigation of application-layer security resulted in the establishment of a set of requirements for the use of contextual information in application level authorization. Existing network authentication protocols and access control mechanisms are analyzed for their ability to fulfill these requirements and their suitability in facilitating context-aware authorization. The result is the design and development of a new context-aware authorization architecture, using the proposed modifications to Role-based Access Control (RBAC). One of the distinguishing characteristics of the proposed architecture is its ability to handle authorization with context-transparency, and provide support for real-time granting and revocation of permissions. During the investigation of the context-aware authorization architecture, other security contexts in addition to host location were found to be useful in application level authorization. These included network topology between the host and application server, the security of the host and the host execution environment. Details of the prototype implementation, performance results, and context acquisition services are presented.

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23

Faure, Matthieu. "Mise en oeuvre de la composition de services scénarisée et centrée utilisateur pour les environnements pervasifs collaboratifs." Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2012. http://tel.archives-ouvertes.fr/tel-00790156.

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L'informatique pervasive (ou ubiquitaire) est un support pour des environnements contenant de nombreux objets (ou dispositifs) disséminés, équipés d'électronique et interconnectés. Ces dispositifs fournissent un accès distant à une multitude de fonctionnalités qui nous aident dans notre vie quotidienne. Les Architectures Orientées Services sont adaptées à la conception de logiciels pervasifs. En e ffet, chaque dispositif fournit son propre ensemble de fonctionnalités sous la forme de services. Ainsi, en l'absence de mécanisme complémentaire, les utilisateurs se trouvent limités à utiliser les services isolément alors que leurs besoins correspondent à des scénarios qui impliquent une composition de multiples services o erts par plusieurs appareils. Dans cette thèse, nous défendons qu'un système pervasif doit : d'une part, permettre aux utilisateurs d'exprimer facilement leurs besoins en créant des scénarios et d'autre part, proposer à ses utilisateurs une représentation et des moyens de gestion de leur contexte afin qu'ils puissent tirer le meilleur parti de leur environnement et de ses changements. De plus, la présence de plusieurs utilisateurs implique la nécessité de collaborer. Par ailleurs, l'exécution de scénarios doit être résiliente aux changements environnementaux et aux actions des utilisateurs. Elle doit ainsi s'adapter dynamiquement et, si possible, tirer profit du contexte et des changements de l'environnement. Notre contribution, nommée SaS (Scenarios as Services), répond à ces objectifs. Elle propose une approche interopérable capable de s'adapter à l'environnement. Elle fournit une représentation persistante et personnalisable du contexte et inclut un langage de description de scénarios destiné aux utilisateurs. Ces scénarios sont facilement contrôlables, personnalisables et réutilisables. Elle planifie l'exécution pas à pas des scénarios, afin de s'adapter aux changements de l'environnement et de bénéficier des avantages de la mobilité des utilisateurs (exécution d'un scénario, dans la durée, sur plusieurs lieux). Enfin, elle inclut le partage de scénarios qui permet aux utilisateurs de collaborer. Un prototype de SaS, basé sur des normes industrielles (telle qu'OSGi), prouve la faisabilité de notre contribution et nous permet de l'évaluer sur un cas d'étude simple.

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Huhtinen, J. (Jouni). "Utilization of neural network and agent technology combination for distributed intelligent applications and services." Doctoral thesis, University of Oulu, 2005. http://urn.fi/urn:isbn:9514278550.

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Abstract The use of agent systems has increased enormously, especially in the field of mobile services. Intelligent services have also increased rapidly in the web. In this thesis, the utilization of software agent technology in mobile services and decentralized intelligent services in the multimedia business is introduced and described. Both Genie Agent Architecture (GAA) and Decentralized International and Intelligent Software Architecture (DIISA) are described. The common problems in decentralized software systems are lack of intelligence, communication of software modules and system learning. Another problem is the personalization of users and services. A third problem is the matching of users and service characteristics in web application level in a non-linear way. In this case it means that web services follow human steps and are capable of learning from human inputs and their characteristics in an intelligent way. This third problem is addressed in this thesis and solutions are presented with two intelligent software architectures and services. The solutions of the thesis are based on a combination of neural network and agent technology. To be more specific, solutions are based on an intelligent agent which uses certain black box information like Self-Organized Map (SOM). This process is as follows; information agents collect information from different sources like the web, databases, users, other software agents and the environment. Information is filtered and adapted for input vectors. Maps are created from a data entry of an SOM. Using maps is very simple, input forms are completed by users (automatically or manually) or user agents. Input vectors are formed again and sent to a certain map. The map gives several outputs which are passed through specific algorithms. This information is passed to an intelligent agent. The needs for web intelligence and knowledge representation serving users is a current issue in many business solutions. The main goal is to enable this by means of autonomous agents which communicate with each other using an agent communication language and with users using their native languages via several communication channels.

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25

Liu, Jinshan. "Découverte de services sensible à la qualité de service dans les environnements de l'informatique diffuse." Phd thesis, Université de Versailles-Saint Quentin en Yvelines, 2006. http://tel.archives-ouvertes.fr/tel-00469433.

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With the advent of portable devices (e.g., smartphones) and the advances in wireless networking technologies (e.g., WLAN, GPRS, UMTS), the vision of ubiquitous computing is becoming a reality. It aims to facilitate user tasks through the seamless utilization of heterogeneous computing and communication capabilities (represented as services) available in the environment. Service discovery, which is necessary for achieving the above goal, must be aware of the service's non-functional properties due to the challenges posed by ubiquitous computing, such as device portability and mobility. This thesis proposes an overall solution that supports QoS-aware service discovery in ubiquitous computing environments. Our contribution lies in substantiating QoS awareness in the following three aspects. Firstly, during the process of discovering services, the expiring wireless links resulting from device mobility are identified and avoided since they cause service failures and thus hamper service reliability. Secondly, as mu tiple services can be discovered, a comprehensive utility function is proposed to evaluate services in terms of their various non-functional properties, meanwhile taking into account the service user's preferences among them, for the purpose of selecting the best one. Thirdly, to avoid untrustworthy services, a distributed reputation mechanism is proposed to facilitate the evaluation of the service host's trustworthiness. The above three proposed solutions are extensively evaluated respectively, based on analysis and simulation. They are further incorporated into a middleware that supports QoS aware Web service discovery in ubiquitous computing environments. A prototype implementing the middleware is deployed and evaluated. The results show that the overhead introduced by QoS awareness seems reasonable.

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26

Sampat, Miten. "Enabling Locative Experiences." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/35975.

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The appropriate framework to capture and share location information with mobile applications enable the development of interfaces and interface techniques that empower users to obtain and share information on the go. As such, the work in this thesis makes two major contributions. First is the SeeVT framework, a locative backbone that uses currently-available data and equipment in the Virginia Tech and Blacksburg VA environments (e.g., wireless signal triangulation, GPS signals) to make available to applications the location of the device in use. Applications built on this framework have available knowledge of the region in which the userâ s device is located. Second is a set of four applications built on the SeeVT framework: SeeVT â Alumni Edition (a guide for alumni returning to campus, often after lengthy absences), the Newman Project (a library information system for finding books and other library resources), VTAssist (a information sharing system for disabled users), and SeeVT-Art (a guide for users in our local inn and conference center to learn about the art on display). Key in this contribution is our identification and discussion of three interface techniques that emerged from our development efforts: an images-first presentation of information, a lightweight mobile augmented reality style of interaction, and locative content affordances that provide ways to quickly input focused types of information in mobile situations.
Master of Science

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27

Jardim, Carlos Henrique Odenique. "Usando Serviços Web para integrar aplicações cientes de contexto." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-14092006-114217/.

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A Computação Ubíqua está revolucionando a interação do ser-humano com os dispositivos computacionais ao disponibilizar tecnologias pouco intrusivas ao cotidiano das pessoas. A Computação Ciente de Contexto, um dos temas de pesquisa em Computação Ubíqua, tem contribuído para a construção de aplicações capazes de customizar-se e adaptar-se às necessidades do usuário sem a intervenção explícita deste. Suportar o desenvolvimento de aplicações Cientes de Contexto é um dos desafios da Computação Ubíqua. Desenvolvido no mesmo grupo de pesquisa que este trabalho está inserido, o Serviço Web Context Kernel, gerencia informações de contexto e explora as especificações e tecnologias da Web como plataforma de intercâmbio para a informação contextual. O trabalho aqui reportado teve como objetivo investigar a utilização de Serviços Web por meio do emprego da infra-estrutura Context Kernel na integração de aplicações em cenários de trabalho colaborativo e de aprendizado eletrônico. Como resultado, foi elaborado um conjunto de lições aprendidas provenientes do estudo e do emprego das especificações para Serviços Web. Outros resultados foram: as especificações de informações de contexto de grupo e de metadados educacionais em dimensões de contexto e exemplos de utilização do Context Kernel para tornar aplicações cientes de contexto.
Ubiquitous computing has became a revolution in terms of the user-computer interaction by providing technologies that seamlessly integrate themselves to people?s everyday life. Context-aware computing, which is an important research theme in ubiquitous computing, has been contributing for the building of applications that are capable both to customize and adapt themselves aiming to support a user without disturb him. A great challenge in ubiquitous computing has been the support to build context-aware aplications. For that reason, the it has been developed the Context Kernel Web Service, which is a service infrastructure that makes use of Web-based specifications and technologies in order to promote the management and the interchange of context information. In this work the usage of Web Services was analyzed by using the Context Kernel to integrate applications in scenarios of cooperative work and e-learning. As a result, a list of lessons learned was ellaborated with respect to the use and the study of Web Services specifications for context-aware computing. Other results include a context information specifications for metadata about group and educational resources as well as examples of how to use the Context Kernel to leverage applications context-aware.

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28

Jonsson, Katrin. "Digitalized industrial equipment an investigation of remote diagnostics services /." Doctoral thesis, Umeå : Institutionen för informatik, Umeå universitet, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-33717.

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29

Barrientos, Alfredo, Julissa E. Calderón, and Stephanie Mujica. "Context Awareness & Pervasive Computing: Arquitectura lógica de un sistema perceptivo al contexto de un usuario." The International Institute of Informatics and Systemics, 2015. http://hdl.handle.net/10757/608513.

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Los Sistemas Perceptivos del Contexto son capaces de reconocer y anticipar proactivamente a necesidades próximas del usuario teniendo en cuenta intereses, ubicación y proximidad, incluso sin necesidad de comunicárselo de manera explícita. Esto gracias al aprovechamiento de las redes sociales como la herramienta de “Inteligencia de Negocios” que permitirá no sólo conectar a los consumidores con las marcas sino también para entender a los clientes finales y con ello desarrollar productos y servicios especializados. Context Awareness se apoya de los Sistemas de Posicionamiento Global (GSP) quienes facilitan servicios basados en la ubicación del usuario para la creación de soluciones contextuales. Diversas arquitecturas son propuestas para el desarrollo de soluciones contextuales sin embargo carecen de ubicuidad, lo que limita la aplicabilidad de las mismas. Este estudio propone una arquitectura lógica para un Sistema Perceptivo del Contexto que permita agilizar la fase de desarrollo reflejando los niveles de dependencia entre componentes hardware y software. A modo validación se proponen escenarios aplicativos que consumen los servicios y dominios propuestos en la arquitectura con ayuda del procesamiento de los sensores y dispositivos inteligentes del mercado móvil. De esta manera, el estudio mejora el desarrollo de los Sistemas Inteligentes.
Los Sistemas Perceptivos del Contexto son capaces de reconocer y anticipar proactivamente a necesidades próximas del usuario teniendo en cuenta intereses, ubicación y proximidad, incluso sin necesidad de comunicárselo de manera explícita. Esto gracias al aprovechamiento de las redes sociales como la herramienta de “Inteligencia de Negocios” que permitirá no sólo conectar a los consumidores con las marcas sino también para entender a los clientes finales y con ello desarrollar productos y servicios especializados. Context Awareness se apoya de los Sistemas de Posicionamiento Global (GSP) quienes facilitan servicios basados en la ubicación del usuario para la creación de soluciones contextuales. Diversas arquitecturas son propuestas para el desarrollo de soluciones contextuales sin embargo carecen de ubicuidad, lo que limita la aplicabilidad de las mismas. Este estudio propone una arquitectura lógica para un Sistema Perceptivo del Contexto que permita agilizar la fase de desarrollo reflejando los niveles de dependencia entre componentes hardware y software. A modo validación se proponen escenarios aplicativos que consumen los servicios y dominios propuestos en la arquitectura con ayuda del procesamiento de los sensores y dispositivos inteligentes del mercado móvil. De esta manera, el estudio mejora el desarrollo de los Sistemas Inteligentes.

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Faure, Matthieu. "Management of scenarized user-centric service compositions for collaborative pervasive environments." Thesis, Montpellier 2, 2012. http://www.theses.fr/2012MON20110/document.

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L'informatique pervasive (ou ubiquitaire) est un support pour des environnements contenant denombreux objets (ou dispositifs) disséminés, équipés d'électronique et interconnectés. Ces dispositifsfournissent un accès distant à une multitude de fonctionnalités qui nous aident dans notre vie quotidienne.Les Architectures Orientées Services sont adaptées à la conception de logiciels pervasifs. En effet,chaque dispositif fournit son propre ensemble de fonctionnalités sous la forme de services. Ainsi, enl'absence de mécanisme complémentaire, les utilisateurs se trouvent limités à utiliser les servicesisolément alors que leurs besoins correspondent à des scénarios qui impliquent une composition demultiples services offerts par plusieurs appareils.Dans cette thèse, nous défendons qu'un système pervasif doit : d'une part, permettre aux utilisateursd'exprimer facilement leurs besoins en créant des scénarios et d'autre part, proposer à ses utilisateursune représentation et des moyens de gestion de leur contexte afin qu'ils puissent tirer le meilleur parti deleur environnement et de ses changements. De plus, la présence de plusieurs utilisateurs implique lanécessité de collaborer. Par ailleurs, l'exécution de scénarios doit être résiliente aux changementsenvironnementaux et aux actions des utilisateurs. Elle doit ainsi s'adapter dynamiquement et, si possible,tirer profit du contexte et des changements de l'environnement.Notre contribution, nommée SaS (Scenarios as Services), répond à ces objectifs. Elle propose uneapproche interopérable capable de s'adapter à l'environnement. Elle fournit une représentation persistanteet personnalisable du contexte et inclut un langage de description de scénarios destiné aux utilisateurs.Ces scénarios sont facilement contrôlables, personnalisables et réutilisables. Elle planifie l'exécution pasà pas des scénarios, afin de s'adapter aux changements de l'environnement et de bénéficier desavantages de la mobilité des utilisateurs (exécution d'un scénario, dans la durée, sur plusieurs lieux).Enfin, elle inclut le partage de scénarios qui permet aux utilisateurs de collaborer. Un prototype de SaS,basé sur des normes industrielles (telle qu'OSGi), prouve la faisabilité de notre contribution et nouspermet de l'évaluer sur un cas d'étude simple
Pervasive (or ubiquitous) computing is a paradigm for environments containing distributedinterconnected devices that embed electronics. These devices provide a remote access to numerousfunctionalities that assist us in our daily life. Service-Oriented Architectures are suitable to design softwarefor pervasive environments. Indeed, each device provides its own set of functionalities as services.Without any extra mechanism, users can only use a single service at a time. Nevertheless, their needsusually correspond to scenarios which involve a composition of multiple services, provided by multipledevices.In this thesis, we advocate that a pervasive system must, on the one hand, enable users to easily expresstheir needs through scenario creation and, on the other hand, propose to users a representation of theircontext so that they can benefit from both their environment and its changes. In addition, the presence ofseveral users implies that users must be able to collaborate.Our contribution, named SaS (Scenarios as Services), fulfils these requirements. It proposes aninteroperable approach that adapts to its environment. It provides users with a customizable andpersistent representation of their context and includes a scenario description language targeted to users.Scenarios are easy to control, customize and reuse. SaS schedules the step-by-step execution ofscenarios to adapt to environmental changes and benefit from user mobility (scenario execution split over time on successive distinct sites). Finally, SaS includes scenario sharing mechanisms which are abasis for collaboration. A prototype of SaS, based on industrial standards (e.g., OSGi), proves thefeasibility of our contribution and serves for its evaluation on a simple use case

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Salma, Najar. "Adaptation des services sensibles au contexte selon une approche intentionnelle." Phd thesis, Université Panthéon-Sorbonne - Paris I, 2014. http://tel.archives-ouvertes.fr/tel-00989775.

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L'émergence des nouvelles technologies a fait évoluer l'usage de ces technologies dans la perspective d'accéder aux différents systèmes qui prennent place dans notre vie quotidienne à n'importe quel endroit et à tout moment. En effet, la démocratisation des dispositifs et l'évolution des technologies mobiles ont bouleversé la manière dont on utilise ces systèmes dans un environnement pervasif. Dans le cadre de l'entreprise, ces nouvelles technologies ont élargi les frontières des Systèmes d'Information (SI) bien au-delà des frontières physiques de l'organisation. Les directeurs des Systèmes d'Information (DSI) sont ainsi confrontés à de nouveaux modes d'interaction entre le SI et son environnement. Les Systèmes d'Information sont ainsi confrontés à un environnement pour lequel ils n'ont pas été particulièrement conçus. Ces systèmes doivent maintenant faire face à un environnement pervasif, et à l'avenir, intégrer des éléments physiques ainsi que logiques et organisationnels. Nous assistons donc aujourd'hui à l'émergence d'une nouvelle génération de Systèmes d'Information: les " Systèmes d'Information Pervasifs " (SIP). Les Systèmes d'Information Pervasifs se veulent alors une réponse à cette importante évolution des SI. Par contre, ils se doivent de gérer l'hétérogénéité et le dynamisme de l'environnement de manière transparente afin de satisfaire au mieux les besoins des utilisateurs. Nous ainsi sommes face à un problème de conception et de réalisation d'un SIP répondant à tous les besoins de transparence, d'adaptation à l'environnement et d'adaptation à l'utilisateur d'un SIP. Or les SIP constituent aujourd'hui une nouvelle génération des SI qui est difficile à conceptualiser, avec peu de méthodes et de modèles disponibles. Ainsi, il devient essentiel de mettre en place un cadre plus formel permettant d'aider les concepteurs à mieux comprendre les SIP et surtout à mieux les maîtriser, tout en assurant la transparence nécessaire à ces systèmes. Dans ce travail de thèse, nous proposons une nouvelle vision intentionnelle et contextuelle des SIP. Cette nouvelle vision représente une vision centrée utilisateur d'un SIP transparent, non intrusif et compréhensible à l'utilisateur. Elle se base sur l'orientation service, la sensibilité au contexte et sur une approche intentionnelle afin de résoudre les problèmes de transparence, d'adaptation à l'environnement et d'adaptation aux utilisateurs. Par la suite, nous proposons une solution plus globale pour concrétiser cette vision intentionnelle et contextuelle des SIP. Nous proposons un cadre conceptuel des SIP décrivant et formalisant l'ensemble de ses éléments afin d'aider la DSI dans sa conception du système. Nous proposons ensuite des mécanismes de découverte et de prédiction de services qui sont intégrés dans une architecture de gestionnaire de SIP qui est conforme à ce cadre conceptuel. Finalement, nous proposons une démarche méthodologique de conception et de réalisation d'un SIP qui supporte le passage entre le cadre conceptuel et l'implémentation de l'architecture proposée.

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Yachir, Ali. "Composition dynamique de services sensibles au contexte dans les systèmes intelligents ambiants." Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST1053/document.

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Avec l'apparition des paradigmes de l'intelligence ambiante et de la robotique ubiquitaire, on assiste à l'émergence de nouveaux systèmes intelligents ambiants visant à créer et gérer des environnements ou écosystèmes intelligents d'une façon intuitive et transparente. Ces environnements sont des espaces intelligents caractérisés notamment par l'ouverture, l'hétérogénéité, l'incertitude et la dynamicité des entités qui les constituent. Ces caractéristiques soulèvent ainsi des défis scientifiques considérables pour la conception et la mise en œuvre d'un système intelligent adéquat. Ces défis sont principalement au nombre de cinq : l'abstraction de la représentation des entités hétérogènes, la gestion des incertitudes, la réactivité aux événements, la sensibilité au contexte et l'auto-adaptation face aux changements imprévisibles qui se produisent dans l'environnement ambiant. L'approche par composition dynamique de services constitue l'une des réponses prometteuses à ces défis. Dans cette thèse, nous proposons un système intelligent capable d'effectuer une composition dynamique de services en tenant compte, d'une part, du contexte d'utilisation et des diverses fonctionnalités offertes par les services disponibles dans un environnement ambiant et d'autre part, des besoins variables exprimés par les utilisateurs. Ce système est construit suivant un modèle multicouche, adaptatif et réactif aux événements. Il repose aussi sur l'emploi d'un modèle de connaissances expressif permettant une ouverture plus large vers les différentes entités de l'environnement ambiant notamment : les dispositifs, les services, les événements, le contexte et les utilisateurs. Ce système intègre également un modèle de découverte et de classification de services afin de localiser et de préparer sémantiquement les services nécessaires à la composition de services. Cette composition est réalisée d'une façon automatique et dynamique en deux phases principales: la phase offline et la phase online. Dans la phase offline, un graphe global reliant tous les services abstraits disponibles est généré automatiquement en se basant sur des règles de décision sur les entrées et les sorties des services. Dans la phase online, des sous-graphes sont extraits automatiquement à partir du graphe global selon les tâches à réaliser qui sont déclenchées par des événements qui surviennent dans l'environnement ambiant. Les sous-graphes ainsi obtenus sont exécutés suivant un modèle de sélection et de monitoring de services pour tenir compte du contexte d'utilisation et garantir une meilleure qualité de service. Les différents modèles proposés ont été mis en œuvre et validés sur la plateforme ubiquitaire d'expérimentation du laboratoire LISSI à partir de plusieurs scénarii d'assistance et de maintien de personnes à domicile
With the appearance of the paradigms of the ambient intelligence and ubiquitaire robotics, we attend the emergence of new ambient intelligent systems to create and manage environments or intelligent ecosystems in a intuitive and transparent way. These environments are intelligent spaces characterized in particular by the opening, the heterogeneousness, the uncertainty and the dynamicité of the entities which establish(constitute) them. These characteristics so lift(raise) considerable scientific challenges for the conception(design) and the implementation of an adequate intelligent system. These challenges are mainly among five: the abstraction of the representation of the heterogeneous entities, the management of the uncertainties, the reactivity in the events, the sensibility in the context and the auto-adaptation

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Rowan, James Thomas Jr. "Digital Family Portraits: Support for Aging in Place." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7472.

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As people age there is an overwhelming desire to remain in the familiar surroundings of the family home, what is called Aging in Place. But inevitable changes that occur in their lives force the aging adults and their families to consider a move to some form of institutional living. Living at a distance from one another, the adult child attempts to maintain peace of mind concerning the well-being of their aging parents but finds it to be a difficult task. I propose to address this problem by first proposing that technology can help minimize the anxieties experienced by the adult child concerning their aging parents well being by appropriately presenting information on the aging parents daily life. This technological design concept does not require that the aging parent input, or for that matter, do anything other than live their lives as they normally live them. Further, this technology provides this information in a manner that is continuously available to the adult child for either opportunistic or planned perusal. As a single instance of the technological design concept proposed above, the Digital Family Portrait embeds well-being related information into an item commonly found in homes, the picture in a picture frame. The Digital Family Portrait was first tested in a wizard-of-oz field trial, then redesigned based on the outcome of this initial field trial coupled with the results of two lab-based studies and a further informal evaluation. The redesigned Digital Family Portrait was built and installed in the home of an adult child while the sensors to drive it were installed in an aging parents home. A field trial of this installation lasting for one year was conducted. The result of this field trial was to find that the Digital Family Portrait was an acceptable means of resolving certain peace of mind issues for the adult child while not raising privacy. It was found to be used in a socially acceptable manner by the adult child while the aging parent to reported feeling less lonely.

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Kheiravar, Sara [Verfasser], and Thorsten [Akademischer Betreuer] Blecker. "Exploring the acceptance of ubiquitous computing-based Information services in brick and mortar retail environments - an integration of UTAUT2 and media system dependency theory / Sara Kheiravar ; Betreuer: Thorsten Blecker." Hamburg : Universitätsbibliothek der Technischen Universität Hamburg-Harburg, 2018. http://d-nb.info/1163662313/34.

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Moreno, Diana. "Modèles, outils et plate-forme d'exécution pour les applications à services dynamiques." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00875053.

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L'essor de l'Internet et l'évolution des dispositifs communicants ont permis l'intégration du monde informatique et du monde réel, ouvrant ainsi la voie à de nouveaux types d'applications, tels que les applications ubiquitaires et pervasives. Ces applications doivent s'exécuter dans des contextes hétérogènes, distribués et ouverts qui sont en constante évolution. Dans de tels contextes, la disponibilité des services et des dispositifs, les préférences et la localisation des utilisateurs peuvent varier à tout moment pendant l'exécution des applications. La variabilité des contextes d'exécution fait que l'exécution d'une application dépend, par exemple, des services disponibles ou des dispositifs accessibles à l'exécution. En conséquence, l'architecture d'une telle application ne peut pas être connue statiquement à la conception, au développement ou au déploiement, ce qui impose de redéfinir ce qu'est une application dynamique : comment la concevoir, la développer, l'exécuter et la gérer à l'exécution. Dans cette thèse, nous proposons une approche dirigée par les modèles pour la conception, le développement et l'exécution d'applications dynamiques. Pour cela, nous avons défini un modèle de composants à services permettant d'introduire des propriétés de dynamisme au sein d'un modèle de composants. Ce modèle permet de définir une application en intention, par un ensemble de propriétés, de contraintes et de préférences de composition. Une application est ainsi spécifiée de façon abstraite ce qui permet de contrôler la composition graduelle de l'application lors de son développement et de son exécution. Notre approche vise à effacer la frontière entre les activités effectuées avant et pendant l'exécution des applications. Pour ce faire, le même modèle et les mêmes mécanismes de composition sont utilisés de la conception jusqu'à l'exécution des applications. A l'exécution, le processus de composition considère, en plus, les services disponibles dans la plate-forme d'exécution permettant la composition opportuniste des applications ; ainsi que la variabilité du contexte d'exécution permettant l'adaptation dynamique des compositions. Nous avons mis en oeuvre notre approche à travers le prototype nommé COMPASS, qui s'appuie sur les plates-formes CADSE pour la réalisation d'environnements logiciels de conception et de développement, et APAM pour la réalisation d'un environnement d'exécution d'applications à services dynamiques.

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Rodrigues, André Luiz Barbosa. "Uma infraestrutura para monitoramento de sistemas cientes do contexto." Universidade do Estado do Rio de Janeiro, 2009. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=7508.

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Aplicações ubíquas e pervasivas são cientes do contexto dos recursos utilizados no que diz respeito à disponibilidade e qualidade. Esta classe de aplicações pode se beneficiar de mecanismos para descobrir recursos que atendam aos requisitos não-funcionais desejados, e mecanismos para monitorar a qualidade destes recursos. Neste trabalho é proposta uma arquitetura para dois serviços que deveriam ser incluídos na infra-estrutura de suporte a ser utilizada pelas aplicações mencionadas: um Serviço de Contexto, que provê acesso a informações de contexto, e um Serviço de Descoberta, que permite a descoberta dinâmica de recursos, levando em conta restrições de contexto a serem satisfeitas. Estes serviços se apóiam em Agentes de Recursos, que efetivamente monitoram os recursos e sensores. Uma implementação de referência foi desenvolvida, oferecendo os serviços mencionados na forma de Serviços Web e implementando os Agentes de Recursos empregando um padrão de projeto simples. Para avaliar os serviços estes foram utilizados como infra-estrutura para o desenvolvimento de um sistema tolerante a falhas e uma aplicação de assistência domiciliar remota (tele-saúde). O desempenho dos serviços também foi avaliado.
Ubiquitous and pervasive applications are aware of the context of the used resources, regarding their availability and quality. This class of application can benefit from mechanisms to discover resources that meet their non-functional requirements and mechanisms to monitor the quality of those resources. We proposed architecture for two services that should be included in the supporting infrastructure used by the mentioned applications: a Context Service that provides access to context information; and a Discovery Service, which allows the dynamic discovery of resources, considering context constraints to be satisfied. These services rely on Resource Agents, which monitor the actual resources and sensors. A reference implementation was developed, providing the mentioned services as Web Services and implementing the Resource Agents using a simple design pattern. To evaluate these services were employed them as the infrastructure to design a fault tolerant system and a remote assisted living application. The performance of the services was also evaluated.

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Damou, Elmehdi. "ApAM : Un environnement pour le développement et l'exécution d'applications ubiquitaires." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00911462.

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Simplifier notre interaction avec les entités informatiques interconnectées de notre environnement et faciliter l'exploitation des informations générées par celles-ci est l'objectif des environnements et des applications ubiquitaires. Le comportement des applications ubiquitaires dépend de l'état et de la disponibilité des entités (logiciels ou dispositifs) qui composent l'environnement ubiquitaire dans lequel elles évoluent, ainsi que des préférences et localisations des utilisateurs. Développer et exécuter des applications ubiquitaires est un véritable défi que notre approche essaie de relever au travers de l'environnement d'exécution ApAM. Considérant que l'environnement d'exécution est imprévisible, nous partons du principe qu'une application ubiquitaire doit disposer d'une grande flexibilité dans le choix de ses composants et que cette composition doit être automatique. Nous proposons une description abstraite et implicite de la composition (où les composants et les liens entre eux ne sont pas décrits explicitement), ce qui permet de construire l'application incrémentalement pendant la phase d'exécution. La plate-forme d'exécution ApAM implémente ces mécanismes de composition incrémentale et s'en sert pour conférer aux applications ubiquitaires la capacité de " résister " et de s'adapter aux changements imprévisibles de l'environnement d'exécution. Cette propriété dite de résilience est au coeur de notre approche car elle permet aux programmeurs de développer " simplement " des applications " résilientes " sans avoir à décrire les diverses adaptations à réaliser et même sans connaître toutes les perturbations de l'environnement auxquelles elles seront soumises. Notre proposition offre le moyen de développer et d'exécuter des applications ayant un haut niveau de résilience vis-à-vis des évolutions de leur contexte d'exécution, grâce à des mécanismes automatiques capables de construire et de modifier à l'exécution l'architecture logicielle des applications ubiquitaire. Les mécanismes fournis sont génériques mais peuvent être étendus et spécialisés pour s'adapter plus finement à certaines applications ou à des domaines métiers spécifiques.

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Santana, Luiz Henrique Zambom. "ADESCOU : Uma Abordagem para o desenvolvimento de software para computação ubíqua." Universidade Federal de São Carlos, 2008. https://repositorio.ufscar.br/handle/ufscar/400.

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Financiadora de Estudos e Projetos
This dissertation presents an approach to the software development in the Ubiquitous Computing, which instantiates the Rational Unified Process (RUP), based on Ontologies, Semantic Web Services, and Software Agents. Ontologies are employed to improve the description of the use context, enabling the applications to be context-aware. Semantic Web Services are used as software components distributed over the Internet, and are composed to perform complex tasks. Software Agents manages the applications using the Ontologies and the Semantic Web Services. A framework, called UBICK, was built to facilitate the design and the implementation of ubiquitous applications, based on components reuse. A case study illustrates the use of this approach in order to develop an Electronic Reflexive Portfolio in the medical education domain.
Esta dissertação apresenta uma abordagem para orientar o desenvolvimento de software na Computação Ubíqua que instancia o Rational Unified Process (RUP), com base em Ontologias, Serviços Web Semânticos, Agentes de Software. Ontologias são empregadas para facilitar o desenvolvimento de aplicações sensíveis a contexto. Serviços Web Semânticos são utilizados como componentes de software distribuídos pela Internet e são compostos para realizar tarefas complexas. Agentes de Software gerenciam as aplicações, facilitando o uso das Ontologias e dos Serviços Web Semânticos. Um framework, denominado UBICK, foi construído a fim de estruturar o projeto e implementação das aplicações ubíquas, baseado no reuso de componentes. Como estudo de caso, apresenta-se o uso da abordagem proposta no desenvolvimento de um Portfólio Reflexivo Eletrônico para o domínio de ensino na medicina.

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Zanuz, Luciano. "SMALLSOA – Um Motor para Execução de Composições de Serviços em Ambientes Móveis." Universidade do Vale do Rio do Sinos, 2009. http://www.repositorio.jesuita.org.br/handle/UNISINOS/2269.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Arquiteturas orientadas a serviços (SOA) voltaram a ganhar destaque, após o surgimento dos web services, como uma tecnologia capaz de melhorar consideravelmente a interoperabilidade entre aplicações de software. Para apoiar a crescente necessidade de colaboração entre pessoas fisicamente separadas, como em sistemas de trabalho ou ensino à distância, ambientes colaborativos estão sendo construídos utilizando a Internet como plataforma. Com a popularização dos dispositivos móveis, softwares que permitem interações entre quaisquer dispositivos, móveis ou não, utilizando tecnologias variadas de comunicação rumo a um mundo ubíquo, vêm ganhando destaque. SOA, por sua vez, está sendo considerada uma das plataformas mais indicadas para sistemas colaborativos ubíquos. Este trabalho apresenta SmallSOA, um motor para execução de composições de serviços em ambientes móveis, um dos componentes centrais da arquitetura orientada a serviços chamada U-SOA que o grupo de pesquisa de Engenharia de Software e Linguagens de Pr
Services-oriented architectures (SOA) restarted to gain prominence after the emergence of web services as a technology able to improve the interoperability between software applications. To support the growing need for collaboration between people physically separated as in distance work or learning systems, collaborative environments are being constructed using the Internet as platform. With the popularization of mobile devices, software that allows interactions between any devices, mobile or not, using different communication technologies towards a ubiquitous world are gaining prominence. SOA, in its turn, is considered one of the most suitable platforms for ubiquitous collaborative systems. This work presents SmallSOA, an engine for services compositions execution on mobile environments, one of the central components of the service oriented architecture called U-SOA that the research team on Software Engineering and Programming Languages at Unisinos is developing. An engine for services compositions exec

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Bousselmi, Ayoub. "Conception et optimisation d’un système d’information d’aide à la mobilité : une approche multi-agent pour la recherche et la composition des services dans un espace ubiquitaire." Thesis, Ecole centrale de Lille, 2015. http://www.theses.fr/2015ECLI0011/document.

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Dans un contexte de mobilité ubiquitaire, des différents objets sont capables d'interagir avec les utilisateurs pour leurs fournir des services innovants et les aider à optimiser leurs plans de déplacement. En effet, le nombre des utilisateurs est ainsi que le nombre de fournisseurs de service demandés par ces utilisateurs sont en pleine augmentation. Cette croissance implique un aspect de concurrence et nécessite des choix optimisés. Dans ce cadre, l'objectif de cette thèse est de concevoir et optimiser un système d'aide au déplacement qui couvre non seulement les services de déplacement quotidien mais aussi les services touristiques, culturels et bien d'autres. Les travaux de recherche présentés dans ce manuscrit proposent la mise en place d'une Plateforme de Recherche et de composition des Services d'Aide à la Mobilité (PRoSAM) afin d'optimiser les tâches de recherche, composition et distribution des Informations de Mobilité Avancée (IMA). L'aspect dynamique et distribué du problème, nous a conduit à adopter une modélisation orientée agent afin de s'adapter aux conditions d'un environnement ubiquitaire. Grâce à une approche de changement dynamique des rôles des agents utilisateurs et un protocole de négociation innovant, les clients sont capables d'échanger les services d'une manière autonome et d’établir des accords totaux ou partiels en fonction de l'offre et de la demande. Finalement, les résultats de simulation présentés dans cette thèse démontrent l'efficacité des approches adoptées
In a context of ubiquitous mobility, different objects are able to interact with users to provide them with innovative services and help them optimize their travel plans. Indeed, the number of users and the number of service providers requested by these users are actively growing. This growth involves an aspect of competition and requires optimized choices. In this context, the aim of this thesis is to design and optimize a mobility aid system that covers not only transport services but also tourist services, cultural services and many others. The research presented in this thesis proposes the establishment of a Plateforme de Recherche et de composition des Services d'Aide à la Mobilité (PRoSAM) to optimize research, composition and distribution tasks of advanced mobility information. The dynamic and distributed aspects of the problem have led us to adopt an agent-oriented modeling approach to cope with the conditions of a ubiquitous environment. Thanks to a dynamic role switching strategy of user agents and an innovative negotiation protocol, customers are able to exchange services autonomously and to establish full or partial agreements in order to optimize communications over the network. Finally, the simulation results presented in this thesis demonstrate the effectiveness of the proposed approaches

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Zeidler, Andreas. "A Distributed Publish/Subscribe Notification Service for Pervasive Environments." Phd thesis, [S.l.] : [s.n.], 2005. http://elib.tu-darmstadt.de/diss/000519.

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Liu, Yong. "Service discovery in an open ubiquitous computing environment." [Bloomington, Ind.] : Indiana University, 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3386698.

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Thesis (Ph.D.)--Indiana University, Dept. of Computer Sciences, 2009.
Title from PDF t.p. (viewed on Jul 22, 2010). Source: Dissertation Abstracts International, Volume: 70-12, Section: B, page: 7673. Adviser: Kay Connelly.

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Karlsen, Bjarte Stien. "Enabling a Ubiquitous Location Based Service on Campus." Thesis, Norwegian University of Science and Technology, Department of Computer and Information Science, 2005. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9279.

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This thesis have looked at two subjects that are a necessary part of a Location Based Service. Guidelines on how to make a Location Model of the campus has been suggested. The proposed model enhanced already existing suggestions and provides support for different queries. Testing was done with Ekahau WLAN positioning technology to obtain location information. The results of the testing showed that the technology was suitable to provide a services that required accuracy at room-level. Services that required a finer grained location estimate where not feasible.

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Brustad, Andreas Larsen, and Christian Hågensen Mosveen. "UbiCollab: A Service Architecture for Supporting Ubiquitous Collaboration." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for datateknikk og informasjonsvitenskap, 2006. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12787.

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Ubiquitous computing integrates computation into the environment, and enables users to move around and interact with computers more naturally than they currently do. This helps to address some of the traditional challenges of computer supported collaborative work (CSCW), as users are not bound to a desk and a personal computer, and are not forced to stay in a static environment where ad-hoc collaboration is impossible. UbiCollab is a platform for the support of ubiquitous collaboration, and it provides such functionality as context-awareness and automatic device discovery. The vision of UbiCollab is to be both flexible and extendible, so that it can provide ubiquitous collaboration support for many different existing and non-existing domains and settings. A previous study has compiled a set of requirements that needs to be fulfilled in order for a platform to reach this vision. This work re-designs the architecture and the platform components of UbiCollab so that they conform to these requirements. OSGi is chosen as the underlying architecture, supporting the requirements of flexibility and extendibility, and a suitable OSGi framework for the platform is chosen. The platform components and their application programming interfaces (APIs) are designed, and a selected number of these are implemented with full or partial functionality. A testbed of applications and external services is used throughout development to test the flexibility and functionality of the platform and the completeness of the APIs.

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Spikol, Daniel. "Playing and Learning Across Locations: : Indentifying Factors for the Design of Collaborative Mobile Learning." Licentiate thesis, Växjö University, School of Mathematics and Systems Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-3698.

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The research presented in this thesis investigates the design challenges associated with the development and use of mobile applications and tools for supporting collaboration in educational activities. These technologies provide new opportunities to promote and enhance collaboration by engaging learners in a variety of activities across different places and contexts. A basic challenge is to identify how to design and deploy mobile tools and services that could be used to support collaboration in different kinds of settings. There is a need to investigate how to design collaborative learning processes and to support flexible educational activities that take advantage of mobility. The main research question that I focus on is the identification of factors that influence the design of mobile collaborative learning.

The theoretical foundations that guide my work rely on the concepts behind computer supported collaborative learning and design-based research. These ideas are presented at the beginning of this thesis and provide the basis for developing an initial framework for understanding mobile collaboration. The empirical results from three different projects conducted as part of my efforts at the Center for Learning and Knowledge Technologies at Växjö University are presented and analyzed. These results are based on a collection of papers that have been published in two refereed international conference proceedings, a journal paper, and a book chapter. The educational activities and technological support have been developed in accordance with a grounded theoretical framework. The thesis ends by discussing those factors, which have been identified as having a significant influence when it comes to the design and support of mobile collaborative learning.

The findings presented in this thesis indicate that mobility changes the contexts of learning and modes of collaboration, requiring different design approaches than those used in traditional system development to support teaching and learning. The major conclusion of these efforts is that the learners’ creations, actions, sharing of experiences and reflections are key factors to consider when designing mobile collaborative activities in learning. The results additionally point to the benefit of directly involving the learners in the design process by connecting them to the iterative cycles of interaction design and research.

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NETO, ERMINIO DA CAS. "FREQUENCY SHARING BETWEEN UBIQUITOUSLY DEPLOYED FIXED SATELLITE SERVICE EARTH STATIONS AND STATIONS OF THE TERRESTRIAL SERVICES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2016. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=33371@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
PROGRAMA DE EXCELENCIA ACADEMICA
O crescente interesse em Sistemas de alta densidade do Serviço Fixo por Satélite (High Density Fixed-Satellite Services - HDFSS) deu origem a estudos na União Internacional de Telecomunicações (UIT) para que sua implantação siga recomendações no intuito de minimizar a interferência em outros serviços de telecomunicações. Tais sistemas são interessantes devido à sua flexibilidade na implantação ubíqua de terminais de pequeno porte, sem a necessidade de coordenação. Com o objetivo de regulamentar a implantação de tais sistemas, o Grupo de Estudos 4 do Setor de Radio comunicações da UIT, que trata do serviço fixo por satélite, tem desenvolvido e sugerido estudos visando à criação de uma recomendação contendo metodologias para o compartilhamento de frequências envolvendo estações terrenas (terminais) ubiquamente distribuídas. Assim, em 2003, na Conferência Mundial de Radio comunicações da UIT, foram identificadas faixas de frequências específicas para a operação de sistemas HDFSS, sendo que grande parte das faixas de frequência identificadas é compartilhada, em caráter primário, com os sistemas do Serviço Fixo Terrestre (FS) e, por este motivo, é importante que sejam desenvolvidos estudos para regulamentação e o controle deste compartilhamento. No âmbito da UIT a principal motivação desses estudos é a análise da interferência provocada por sistemas HDFSS implantados em um país em serviços que compartilham a mesma frequência em um país vizinho. É neste cenário que o presente trabalho propõe uma metodologia para avaliação da interferência produzida por terminais ubiquamente distribuídos em sistemas FS. Essa metodologia visa a determinação de uma região de coordenação, possibilitando, assim, que terminais sejam implantados livremente fora desta região, garantindo níveis adequados de interferência nos sistemas FS.
The growing interest in High-Density Fixed Service Satellite systems (HDFSS) has led to studies at the International Telecommunication Union (ITU) aiming the development of a recommendation for guidance on its implementation in order to minimize interference affecting other telecommunications services. Such systems are of interest due to their flexibility in the ubiquitous deployment of small terminals, Without the need for coordination. In order to regulate the implementation of such systems, the Study Group 4 of the ITU Radiocommunication Sector, responsible for the fixed-satellite service, has developed and suggested studies aimed at creating a recommendation containing methodologies for frequency sharing involving earth stations (terminals) ubiquitously distributed. Thus, in 2003, at the World Radiocommunication Conference of the ITU, specific frequency bands for HDFSS systems operation have been addressed, and most of the frequency bands identified are shared, on a primary basis, With the terrestrial fixed service systems (FS) and, for this reason, such studies for regulation and control of this share has become important. The ITU main motivation for these studies is the analysis of the interference caused by the HDFSS systems deployed in a country, into the communication sevices of neighboring countries. In this scenario, this paper proposes a methodology for evaluating interference produced by a ubiquitously distributed terminals into FS systems. This method aims at determining a coordination region, thus enabling terminals to be freely deployed outside this region, without producing unacceptable levels of interference into the FS receivers.

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Lee, Choon-Hwa. "Context-aware, ubiquitous service discovery and delivery for mobile clients." [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0000864.

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Morand, Denis. "Cilia : un framework pour le développement d'applications de médiation autonomiques." Phd thesis, Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00952107.

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Cette thèse se situe dans le domaine de l'informatique orientée service. Elle propose un ESB (Enterprise Service Bus) autonomique, c'est-à-dire capable de s'autogérer sur un ensemble d'aspects. Cet ESB, nommé Cilia autonomique, permet de construire des applications de médiation sensibles au contexte. Précisément, la version autonomique de Cilia, que nous proposons, permet l'optimisation de l'utilisation des ressources de la plate-forme d'exécution et l'adaptation dynamique des chaînes de médiation au niveau de la configuration et de la topologie. Notre framework permet également de présenter à tout moment un modèle simplifié des phénomènes liés à l'exécution des chaînes et, ainsi, de faciliter le raisonnement et la prise de décisions d'adaptation. Les travaux de cette thèse ont été validés dans le cadre de l'informatique pervasive. En particulier, Cilia autonomique a été utilisé et instrumenté pour la mise en œuvre d'applications de maintien à domicile et de suivi de la santé des usagers. Les résultats sont disponibles en open source.

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Nassar, Jad. "Ubiquitous networks for Smart Grids." Thesis, Lille 1, 2018. http://www.theses.fr/2018LIL1I053/document.

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Les Smart Grids visent à transformer le réseau électrique actuel en un réseau "plus intelligent" où la production énergétique est décentralisée et automatisée, facilitant l'intégration des sources d'énergie renouvelables. Cette évolution est rendue possible grâce à l'utilisation d'un réseau de communication pour les multiples échanges de données hétérogènes des Smart Grids. L'objectif de cette thèse est de proposer un paradigme de communication efficace en termes de qualité de service pour les Smart Grids basé sur les réseaux de capteurs.Dans un premier temps, on s’intéresse au protocole standard RPL. Nous proposons une évolution de celui-ci à travers une nouvelle fonction objectif. Celle-ci tire parti de l’hétérogénéité matérielle des nœuds et des liens pour introduire la qualité de service. Cela permet à RPL de satisfaire les multiples et différentes exigences en termes de fiabilité, de latence et de priorité dans l'acheminement des données. Nos résultats montrent que notre approche permet bien la différentiation du trafic tout en réduisant la latence du routage et en économisant l'énergie.Nous proposons également d'améliorer l'utilisation du réseau de capteurs en y introduisant l’auto-organisation et la réduction des données. Le but est alors de prédire la valeur des données mesurées plutôt que de les transmettre.Une autre approche explorée est d'agréger les différents messages transitant sur le réseau tout en considérant leurs différentes exigences de qualité de service. Ces deux approches permettent ainsi de réduire la consommation d'énergie tout en respectant les exigences des différentes applications des Smart Grids
Smart Grids aim to transform the current electric grid into a "smarter" network where energy production is decentralized and automated, which facilitates the integration of renewable energy resources. This evolution is made possible thanks to the use of a communication network for the multiple heterogeneous data exchanges of the Smart Grids. Hence, the aim of this thesis is to propose an efficient communication paradigm in terms of quality of service for Smart Grids based on wireless sensor networks.First, we study data routing in Smart Grids with the RPL standard. Nevertheless, RPL is not suitable for Smart Grid applications in terms of quality of service. Therefore, we propose an objective function for RPL that takes different features of both nodes and links into consideration. Results show that our approach improves network performance compared to existing solutions in terms of packet delivery ratio, network lifetime, latency and traffic differentiation.Then, we also propose a more efficient data collection by introducing self-organization and data reduction for these wireless sensors. The goal is to predict the value of the measured data rather than transmitting them. Another explored approach is to aggregate the different messages sent across the network while considering their different requirements in terms of quality of service.These two approaches reduce the energy consumption while respecting the requirements of the different applications of the Smart Grids

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Ingmarsson, Magnus. "Modelling User Tasks and Intentions for Service Discovery in Ubiquitous Computing." Licentiate thesis, Linköping University, Linköping University, MDA - Human Computer Interfaces, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8319.

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Ubiquitous computing (Ubicomp) increases in proliferation. Multiple and ever growing in numbers, computational devices are now at the users' disposal throughout the physical environment, while simultaneously being effectively invisible. Consequently, a significant challenge is service discovery. Services may for instance be physical, such as printing a document, or virtual, such as communicating information. The existing solutions, such as Bluetooth and UPnP, address part of the issue, specifically low-level physical interconnectivity. Still absent are solutions for high-level challenges, such as connecting users with appropriate services. In order to provide appropriate service offerings, service discovery in Ubicomp must take the users' context, tasks, goals, intentions, and available resources into consideration. It is possible to divide the high-level service-discovery issue into two parts; inadequate service models, and insufficient common-sense models of human activities.

This thesis contributes to service discovery in Ubicomp, by arguing that in order to meet these high-level challenges, a new layer is required. Furthermore, the thesis presents a prototype implementation of this new service-discovery architecture and model. The architecture consists of hardware, ontology-layer, and common-sense-layer. This work addresses the ontology and common-sense layers. Subsequently, implementation is divided into two parts; Oden and Magubi. Oden addresses the issue of inadequate service models through a combination of service-ontologies in concert with logical reasoning engines, and Magubi addresses the issue of insufficient common-sense models of human activities, by using common sense models in combination with rule engines. The synthesis of these two stages enables the system to reason about services, devices, and user expectations, as well as to make suitable connections to satisfy the users' overall goal.

Designing common-sense models and service ontologies for a Ubicomp environment is a non-trivial task. Despite this, we believe that if correctly done, it might be possible to reuse at least part of the knowledge in different situations. With the ability to reason about services and human activities it is possible to decide if, how, and where to present the services to the users. The solution is intended to off-load users in diverse Ubicomp environments as well as provide a more relevant service discovery.

Report code: LiU-Tek-Lic-2007:14.

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