13 research outputs found
Development of Semantic Model of Multi-Level-Building Navigation Using Indoor Ontology and Dijkstra's Algorithm
Location based services (LBS) can be separated into a number of layers: technology layer, application layer, standard layer, and social-ethical layer. This paper presents an ontology development at standard layer. We developed an ontology to identify and classify indoor semantic information to guide the development of LBS applications for multi-level building navigation. This ontology proposed models of multilevel building properties as classes of building, level, zone, link, node, and coordinate. To apply this ontology, we develop an indoor navigation algorithm using the ontology classes and Dijkstra’s algorithm for shortest path in user navigation. A prototype and experiments are implemented to validate this ontology
Évaluation et la représentation spatiotemporelle de l'accessibilité des réseaux piétonniers pour le déplacement des personnes à mobilité réduite
La mobilité des personnes à mobilité réduite (PMR) joue un rôle important dans leur inclusion sociale. Les PMR ont besoin de se déplacer de manière autonome pour effectuer leurs routines quotidiennes comme aller à l'école, au travail, au centre de remise en forme ou faire du magasinage. Cependant, celles-ci ne sont pas entièrement exécutées en raison de la conception non-adaptée des villes pour ces personnes. En effet, la mobilité est une habitude de vie humaine qui est le résultat d'interactions entre les facteurs humains (par exemple, les capacités) et les facteurs environnementaux. Au cours des dernières années, la mise au point de technologies d’aide technique s'est développée progressivement pour permettre aux PMR d’améliorer leur qualité de vie. En particulier, ces technologies offrent une variété de caractéristiques qui permettent à ces personnes de surmonter divers obstacles qui réduisent leur mobilité et contribuent à leur exclusion sociale. Cependant, malgré la disponibilité des technologies d’aide à la navigation et à la mobilité, leur potentiel est mal exploité pour les PMR. En effet, ces technologies ne considèrent pas les interactions « humain-environnement » adéquatement pour ces utilisateurs. L'objectif général de cette thèse est d'utiliser les potentiels des méthodes et des technologies de science de l'information géographique (SIG) afin d’aider à surmonter les problèmes de mobilité des PMR en créant un cadre d'évaluation de l'accessibilité et en développant une approche personnalisée de routage qui prend en compte les profils de ces personnes. Pour atteindre ce but, quatre objectifs spécifiques sont considérés: 1) développer une ontologie de mobilité pour les PMR qui considère les facteurs personnels et environnementaux, 2) proposer une méthode de l’évaluation de l'accessibilité du réseau piétonnier pour la mobilité des PMR en considérant spécifiquement les interactions entre les facteurs humains (la confiance) et les facteurs environnementaux, 3) étudier le rôle des facteurs sociaux dans l'accessibilité des zones urbaines et, finalement, 4) affiner les algorithmes existants pour calculer les itinéraires accessibles personnalisés pour les PMR en considérant leurs profils. En effet, tout d'abord pour développer une ontologie pour la mobilité des PMR, la dimension sociale de l'environnement ainsi que la dimension physique sont intégrées et une nouvelle approche basée sur une perspective « nature-développement » est présentée. Ensuite, une approche fondée sur la confiance des PMR est développée pour l'évaluation de l'accessibilité du réseau piétonnier, compte tenu de l'interaction entre les facteurs personnels et les facteurs environnementaux. De plus, dans une perspective de considération des facteurs sociaux, le rôle des actions politiques sur l'accessibilité du réseau piétonnier est étudié et l'influence de trois politiques potentielles est analysée. Enfin, une nouvelle approche pour calculer des itinéraires personnalisés pour les PMR en tenant compte de leurs perceptions, de leurs préférences et de leurs confidences est proposée. Les approches proposées sont développées et évaluées dans le quartier Saint-Roch à Québec, et ce, en utilisant une application d'assistance mobile et multimodale développée dans le cadre du projet MobiliSIG.Mobility of people with motor disabilities (PWMD) plays a significant role in their social inclusion. PWMD need to move around autonomously to perform their daily routines such as going to school, work, shopping, and going to fitness centers. However, mostly these needs are not accomplished because of either limitations concerning their capabilities or inadequate city design. Indeed, mobility is a human life habit, which is the result of interactions between people and their surrounded environments. In recent years, assistive technologies have been increasingly developed to enable PWMD to live independently and participate fully in all aspects of life. In particular, these technologies provide a variety of features that allow these individuals to overcome diverse obstacles that reduce their mobility and contribute to their social exclusion. However, despite increasing availability of assistive technologies for navigation and mobility, their potential is poorly exploited for PWMD. Indeed, these technologies do not fully consider the human-environment interactions. The overall goal of this dissertation is to benefit from the potentials of methods and technologies of the Geographic Information Sciences (GIS) in order to overcome the mobility issues of PWMD by creating an accessibility-assessing framework and ultimately by developing a personalized routing approach, which better considers the humanenvironment interaction. To achieve this goal, four specific objectives were followed: 1) develop a mobility ontology for PWMD that considers personal factors as well as environmental factors, 2) propose a method to evaluate the accessibility of the pedestrian network for the mobility of PWMD considering the interactions between human factors (confidence) and the environmental factors, 3) study of the role of social factors in the accessibility of urban areas, and finally, 4) refine the existing algorithms to calculate accessible routes for PWMD considering their profile. First, to develop an adapted ontology for mobility of the PWMD, the social dimension of the environment with the physical dimension were integrated and a new approach based on a “Nature-Development” perspective was presented. This perspective led to the development of useful ontologies, especially for defining the relationships between the social and physical parts of the environment. Next, a confidence-based approach was developed for evaluation of the accessibility of pedestrian network considering the interaction between personal factors and environmental factors for the mobility of PWMD. In addition, the role of policy actions on the accessibility of the pedestrian network was investigated and the influence of three potential policies was analyzed. Finally, a novel approach to compute personalized routes for PWMD considering their perception, preferences, and confidences was proposed. The approaches proposed were implemented in the Saint-Roch area of Quebec City and visualized within the multimodal mobile assistive technology (MobiliSIG) applicatio
Advances in Robot Navigation
Robot navigation includes different interrelated activities such as perception - obtaining and interpreting sensory information; exploration - the strategy that guides the robot to select the next direction to go; mapping - the construction of a spatial representation by using the sensory information perceived; localization - the strategy to estimate the robot position within the spatial map; path planning - the strategy to find a path towards a goal location being optimal or not; and path execution, where motor actions are determined and adapted to environmental changes. This book integrates results from the research work of authors all over the world, addressing the abovementioned activities and analyzing the critical implications of dealing with dynamic environments. Different solutions providing adaptive navigation are taken from nature inspiration, and diverse applications are described in the context of an important field of study: social robotics
Shortest Route at Dynamic Location with Node Combination-Dijkstra Algorithm
Abstract— Online transportation has become a basic
requirement of the general public in support of all activities to go
to work, school or vacation to the sights. Public transportation
services compete to provide the best service so that consumers
feel comfortable using the services offered, so that all activities
are noticed, one of them is the search for the shortest route in
picking the buyer or delivering to the destination. Node
Combination method can minimize memory usage and this
methode is more optimal when compared to A* and Ant Colony
in the shortest route search like Dijkstra algorithm, but can’t
store the history node that has been passed. Therefore, using
node combination algorithm is very good in searching the
shortest distance is not the shortest route. This paper is
structured to modify the node combination algorithm to solve the
problem of finding the shortest route at the dynamic location
obtained from the transport fleet by displaying the nodes that
have the shortest distance and will be implemented in the
geographic information system in the form of map to facilitate
the use of the system.
Keywords— Shortest Path, Algorithm Dijkstra, Node
Combination, Dynamic Location (key words
Interactive video retrieval using implicit user feedback.
PhDIn the recent years, the rapid development of digital technologies and the low
cost of recording media have led to a great increase in the availability of
multimedia content worldwide. This availability places the demand for the
development of advanced search engines. Traditionally, manual annotation of
video was one of the usual practices to support retrieval. However, the vast
amounts of multimedia content make such practices very expensive in terms of
human effort. At the same time, the availability of low cost wearable sensors
delivers a plethora of user-machine interaction data. Therefore, there is an
important challenge of exploiting implicit user feedback (such as user navigation
patterns and eye movements) during interactive multimedia retrieval sessions
with a view to improving video search engines. In this thesis, we focus on
automatically annotating video content by exploiting aggregated implicit
feedback of past users expressed as click-through data and gaze movements.
Towards this goal, we have conducted interactive video retrieval experiments, in
order to collect click-through and eye movement data in not strictly controlled
environments. First, we generate semantic relations between the multimedia
items by proposing a graph representation of aggregated past interaction data and
exploit them to generate recommendations, as well as to improve content-based
search. Then, we investigate the role of user gaze movements in interactive video
retrieval and propose a methodology for inferring user interest by employing
support vector machines and gaze movement-based features. Finally, we propose
an automatic video annotation framework, which combines query clustering into
topics by constructing gaze movement-driven random forests and temporally
enhanced dominant sets, as well as video shot classification for predicting the
relevance of viewed items with respect to a topic. The results show that
exploiting heterogeneous implicit feedback from past users is of added value for
future users of interactive video retrieval systems
Anuário CientĂfico – 2011 Resumos de Artigos, Comunicações, Livros e Monografias de Mestrado
Há mais de uma dĂ©cada que o ISEL vem firmando a sua aposta na busca e na divulgação do conhecimento cientĂfico na área da Engenharia, assentes na inovação e no desenvolvimento de novas tecnologias, procurando que os resultados alcançados nos projetos de investigação tenham impacto na indĂşstria e na vida dos cidadĂŁos como forma de responder Ă s necessidades cada vez mais complexas e exigentes da sociedade no seu todo.
Nesta relação, o ISEL tem contribuĂdo para a evolução da produção e do conhecimento cientĂficos, assumindo, por vezes numa posição de vanguarda, ora em iniciativa prĂłpria ora em parceria com diversas instituições, quer de ensino quer do tecido empresarial.
Como forma de dar visibilidade ao trabalho desenvolvido pelos docentes (com afiliação ISEL) e alunos do ISEL, o Anuário CientĂfico tornou-se num meio de divulgação privilegiado, estando disponĂvel em acesso livre a toda a comunidade cientĂfica mas tambĂ©m a todos os cidadĂŁos, podendo ser consultado em formato eletrĂłnico no sĂtio institucional do ISEL, bem como no RepositĂłrio CientĂfico do Instituto PolĂtĂ©cnico de Lisboa.1
Fazendo uma análise comparativa em relação às publicações referentes a 2009 e a 2010, constata-se que o número de publicações duplicou em 2011