Semantic Management of Location-Based Services in Wireless Environments

En los últimos años el interés por la computación móvil ha crecido debido al incesante uso de dispositivos móviles (por ejemplo, smartphones y tablets) y su ubicuidad. El bajo coste de dichos dispositivos unido al gran número de sensores y mecanismos de comunicación que equipan, hace posible el desarrollo de sistemas de información útiles para sus usuarios. Utilizando un cierto tipo especial de sensores, los mecanismos de posicionamiento, es posible desarrollar Servicios Basados en la Localización (Location-Based Services o LBS en inglés) que ofrecen un valor añadido al considerar la localización de los usuarios de dispositivos móviles para ofrecerles información personalizada. Por ejemplo, se han presentado numerosos LBS entre los que se encuentran servicios para encontrar taxis, detectar amigos en las cercanías, ayudar a la extinción de incendios, obtener fotos e información de los alrededores, etc. Sin embargo, los LBS actuales están diseñados para escenarios y objetivos específicos y, por lo tanto, están basados en esquemas predefinidos para el modelado de los elementos involucrados en estos escenarios. Además, el conocimiento del contexto que manejan es implícito; razón por la cual solamente funcionan para un objetivo específico. Por ejemplo, en la actualidad un usuario que llega a una ciudad tiene que conocer (y comprender) qué LBS podrían darle información acerca de medios de transporte específicos en dicha ciudad y estos servicios no son generalmente reutilizables en otras ciudades. Se han propuesto en la literatura algunas soluciones ad hoc para ofrecer LBS a usuarios pero no existe una solución general y flexible que pueda ser aplicada a muchos escenarios diferentes. Desarrollar tal sistema general simplemente uniendo LBS existentes no es sencillo ya que es un desafío diseñar un framework común que permita manejar conocimiento obtenido de datos enviados por objetos heterogéneos (incluyendo datos textuales, multimedia, sensoriales, etc.) y considerar situaciones en las que el sistema tiene que adaptarse a contextos donde el conocimiento cambia dinámicamente y en los que los dispositivos pueden usar diferentes tecnologías de comunicación (red fija, inalámbrica, etc.). Nuestra propuesta en la presente tesis es el sistema SHERLOCK (System for Heterogeneous mobilE Requests by Leveraging Ontological and Contextual Knowledge) que presenta una arquitectura general y flexible para ofrecer a los usuarios LBS que puedan serles interesantes. SHERLOCK se basa en tecnologías semánticas y de agentes: 1) utiliza ontologías para modelar la información de usuarios, dispositivos, servicios, y el entorno, y un razonador para manejar estas ontologías e inferir conocimiento que no ha sido explicitado; 2) utiliza una arquitectura basada en agentes (tanto estáticos como móviles) que permite a los distintos dispositivos SHERLOCK intercambiar conocimiento y así mantener sus ontologías locales actualizadas, y procesar peticiones de información de sus usuarios encontrando lo que necesitan, allá donde esté. El uso de estas dos tecnologías permite a SHERLOCK ser flexible en términos de los servicios que ofrece al usuario (que son aprendidos mediante la interacción entre los dispositivos), y de los mecanismos para encontrar la información que el usuario quiere (que se adaptan a la infraestructura de comunicación subyacente)

Actas da 2ª Conferência Nacional em Interacção Pessoa-Máquina

Actas da 2ª Conferência Nacional em Interacção Pessoa-Máquina, Braga, 16-18 Outubro de 2006Depois do sucesso da primeira edição, organizada em Julho de 2004 na Faculdade de Ciências da Universidade de Lisboa, organizou-se em 2006 a Interacç˜ão 2006 – 2a. Conferência Nacional em Interacç˜ao Pessoa-Máquina – numa iniciativa conjunta do Grupo Português de Computação Gráfica e do Departamento de Informática/Centro de Ciências da Computação da Universidade do Minho. Tal como na sua primeira edição˜ a Interacção 2006 visou promover um ponto de encontro da comunidade interessada na Interacção Pessoa-Máquina em Portugal. Reunindo investigadores, docentes e profissionais, permitiu a divulgação de trabalhos e a troca de experiências entre as comunidades académica e industrial

Applying patterns to hypermedia instructional design (APHID)

This research addresses the issue of automatically generating instructional hypermedia documents (in the form of web sites). Our hypothesis is that, for certain types of hypermedia, an automated approach can produce satisfactory hypermedia applications more efficiently than humans are able to create them. We propose a method (APHID) that guides a hypermedia creator through the design process and partially automates the creation of hypermedia applications. Our method uses concept maps and instructional design patterns, as well as the more common domain and presentation models, to support partial automation for creating instructional hypermedia. Most hypermedia application developers follow basic graphical design principles, but few commonly accepted principles exist for the structuring of hypermedia applications. The design of instructional hypermedia imposes the additional requirement that the designer be expert both in hypermedia design and in instructional design. APHID supports designers through the use of patterns to describe and clarify design concepts for both instructional design and interface design. This thesis describes the design and development of the APHID approach and a prototype software tool that supports the development of instructional hypermedia using the APHID approach. The thesis also presents a study in which web sites created with APHID are compared (by an independent evaluator) to web sites created by instructional technologists. The study shows that good instructional web sites can be generated semi-automatically with less expenditure of time on the part of the instructional designer

A Virtual Architecture Framework for Immersive Learning Environments

This thesis presents a set of experimental studies to understand the benefits of utilising architectural design to create virtual environments optimised for completing a series of cognitively demanding tasks. Each field of investigation is reviewed separately. The first field of investigation relates to spatial design and analysis from an architectural standpoint. The second is concerned with memory, spatial abilities, and embodied cognition. Two VR-based user-studies are designed to further explore the potential interactions between these fields of knowledge. An initial experiment called “Archimemory” is based on a memory palace, a historical mnemonic technique, to explore how spatial knowledge representation can enhance memory retrieval. It compares the benefits of using different architectural designs in VR to support participants’ recall accuracy of a sequence of playing cards. The main user study,called the "Immersive Virtual Architecture Studio" (IVAS), validates a new methodology to study the effect of spatial qualities on embodied cognition related tasks. A spatial analysis using the isovist technique provides an objective approach to measure spatial qualities such as openness and complexity. Participants have to perform a batch of cognitive tasks in the IVAS. Results from the spatial analysis are compared to participants subjective rating of the same spatial qualities as well as their performance.Findings suggest that a spatial performance metric can be evaluated for each room, for instance, it was the highest in the case of the more closed (fewer windows) and more complex (with columns) condition. The combination of spatial analysis and performance metrics obtained from these two novel VR applications, Archimemory and IVAS, leads this research to form a Virtual Architecture Framework. Guidelines are proposed for VR architects, UX designers and scientists to adopt this framework to support further exploration and evaluation of spatial design to enhance human cognitive abilities when experiencing immersive learning environments

Surface interaction : separating direct manipulation interfaces from their applications.

To promote both quality and economy in the production of applications and their interactive interfaces, it is desirable to delay their mutual binding. The later the binding, the more separable the interface from its application. An ideally separated interface can factor tasks from a range of applications, can provide a level of independence from hardware I/O devices, and can be responsive to end-user requirements. Current interface systems base their separation on two different abstractions. In linguistic architectures, for example User Interface Management Systems in the Seeheim model, the dialogue or syntax of interaction is abstracted in a separate notation. In agent architectures like Toolkits, interactive devices, at various levels of complexity, are abstracted into a class or call hierarchy. This Thesis identifies an essential feature of the popular notion of direct manipulation: directness requires that the same object be used both for output and input. In practice this compromises the separation of both dialogue and devices. In addition, dialogue cannot usefully be abstracted from its application functionality, while device abstraction reduces the designer's expressive control by binding presentation style to application semantics. This Thesis proposes an alternative separation, based on the abstraction of the medium of interaction, together with a dedicated user agent which allows direct manipulation of the medium. This interactive medium is called the surface. The Thesis proposes two new models for the surface, the first of which has been implemented as Presenter, the second of which is an ideal design permitting document quality interfaces. The major contribution of the Thesis is a precise specification of an architecture (UMA), whereby a separated surface can preserve directness without binding in application semantics, and at the same time an application can express its semantics on the surface without needing to manage all the details of interaction. Thus UMA partitions interaction into Surface Interaction, and deep interaction. Surface Interaction factors a large portion of the task of maintaining a highly manipulable interface, and brings the roles of user and application designer closer

Using MapReduce Streaming for Distributed Life Simulation on the Cloud

Distributed software simulations are indispensable in the study of large-scale life models but often require the use of technically complex lower-level distributed computing frameworks, such as MPI. We propose to overcome the complexity challenge by applying the emerging MapReduce (MR) model to distributed life simulations and by running such simulations on the cloud. Technically, we design optimized MR streaming algorithms for discrete and continuous versions of Conway’s life according to a general MR streaming pattern. We chose life because it is simple enough as a testbed for MR’s applicability to a-life simulations and general enough to make our results applicable to various lattice-based a-life models. We implement and empirically evaluate our algorithms’ performance on Amazon’s Elastic MR cloud. Our experiments demonstrate that a single MR optimization technique called strip partitioning can reduce the execution time of continuous life simulations by 64%. To the best of our knowledge, we are the first to propose and evaluate MR streaming algorithms for lattice-based simulations. Our algorithms can serve as prototypes in the development of novel MR simulation algorithms for large-scale lattice-based a-life models.https://digitalcommons.chapman.edu/scs_books/1014/thumbnail.jp