22 research outputs found
Acceptance model in designing for extreme users: extreme athletes using activity trackers
‘Extreme Users’ (EU) is a design method in
Human Computer Interaction, which allows user-centered
design in design groups. ‘Acceptance Models’ is a theory in
Information Systems, which models how users accept and
use technology. We conducted a study to explore the
relationships of the factors influencing Extreme Athletes in
the acceptance and use of Activity Trackers (AT). The data
was collected from a cross-sectional survey conducted using
a self-selected convenience sample of 206. The research
rendered an exploration and an examination of the factors
affecting trail-running athletes. The results were analyzed
using several statistical techniques including Structural
Equation Analysis. Our goal was to observe to what extent
the Health Information Technology Acceptance Model
patterns and outlines EU use of AT. This contribution, to
the best of our knowledge, is new given that the obtained
model can be an initial quantitative working primary tool
for designers using the EU design method.info:eu-repo/semantics/publishedVersio
Assessment of activity trackers: toward an acceptance model
In this project we seek to understand the factors that
influence user acceptance of Activity Trackers, through
a model that quantifies how users come to adhere to
the use of Activity Trackers. The proposed research
model and hypotheses were validated and tested with
data collected from a cross-sectional survey conducted
using a self-selected convenience sample. Constructs
from half dozen of established models were gathered
into a suppositional model, based on their hypothetical
applicable relevance for the Activity Trackers use. The
results were analyzed using a variety of statistical
techniques including Structural Equation analysis. The
final result can be a first step for researchers aiming to
complement their own processes of study, ideation or
design of Activity by taking into account factors such as
Usefulness, Ease of Use, Health Consciousness, Hedonic
Motivation, Image, Habit, etc.info:eu-repo/semantics/publishedVersio
Dynamic world model for context-aware environments
Tese de doutoramento
Tecnologias e Sistemas de informaçãoThe main subject of this dissertation is a dynamic symbolic world
model which is connected to sensor networks through data acquisition
and processing modules. Being dynamic, it is capable of accompanying
the state of the represented spaces in real time. This model
can be distributed over several servers as all the objects in the model
are uniquely described by URI and relations may exist with objects
located in remote servers. It also allows users to construct and share
their own models of the world as they visit different places.
Symbolic world models are complementary to geometric world models
which are much more widespread. They are similar to human mental
models of space, allow for meaningful descriptions of locations and
the creation of relations between them.
The main contributions of our research are: the space characterization
based on traces from available networks, automatic feeding of the
world model through a set of processing modules that receive information
from a wireless network, a world model that resembles human
mental models of space, an editing tool for manual creation of the model
and a set of applications that contribute to the model expansion
and/or use the existing data from the model.O tema principal desta dissertação é um modelo de espaços simbólico e dinâmico ligado a uma rede de sensores através de m´módulos de aquisição e processamento de dados. Sendo dinâmico, acompanha o estado dos espaços representados em tempo real. Este modelo pode ser distribuído por vários servidores uma vez que todos os objetos no modelo estão univocamente identificados por um URI e poderão ser estabelecidas relações entre objetos localizados em servidores remotos. Os utilizadores podem criar e partilhar os seus próprios modelos na medida em que vão visitando os diversos locais de interesse. Os modelos de espaço simbólicos complementam os modelos geométricos que são muito mais comuns. São semelhantes aos modelos mentais, permitem a introdução de descrições mais ricas dos objetos e a criação de relações entre eles. Os contributos deste projeto de investigação são: caracterização dos espaços baseada nos dados provenientes de redes existentes, atualização automática do modelo de espaços através de um conjunto de m´módulos de processamento que recebem os dados de uma rede sem fios, um modelo de espaços semelhante aos modelos mentais, uma ferramenta para criação manual do modelo de espaço e um conjunto de aplicações que atualizam o modelo e/ou utilizam os dados existentes
Navigation based on symbolic space models
Existing navigation systems are very appropriate
for car navigation, but lack support for convenient
pedestrian navigation and cannot be used indoors due to
GPS limitations. In addition, the creation and the
maintenance of the required models are costly and time
consuming, and are usually based on proprietary data
structures. In this paper we describe a navigation system
based on a human inspired symbolic space model. We argue
that symbolic space models are much easier to create and to
maintain, and that they can support routing applications
based on self-locating through the recognition of nearby
features. Our symbolic space model is supported by a
federation of servers where the spatial descriptions are
stored, and which provide interfaces for feeding and
querying the model. Local models residing in different
servers may be connected between them, thus contributing
to the system scalability.Fundação para a Ciência e a Tecnologia (FCT
Towards a novel optical access networks management solution: addressing general management complexity
Past technological advances and an increasing need to communicate have led to the creation of the current telecommunications
networks. A critical part of a telecommunications network is the access network, since it must bridge the clients with the services
provided, ensuring an efficient connection between them. In the last few years, both governments and organizations from several
countries have adopted large fiber optics implementations in their access networks, given its broadband capabilities. However,
the structure of such networks can become very complex, forcing organizations to use means that allow them to efficiently
manage such complexity. Several software solutions available on the market are capable of providing management features for
these networks, but the complexity of these solutions can negatively affect management, making it lengthy and error-prone. In
this paper, we describe the initial development of a software solution, consisting of a set of integrated tools that will make optical
access networks management more efficient by addressing the complexity limitations of the current solutions. One of the tools,
presented in this paper, was tested with a local ISP (Internet Service Provider) and showed to be capable of overcoming the
limitations faced by the organization on managing their optical access network.info:eu-repo/semantics/publishedVersio
Smart mobility: a survey
Internet of Things (IoT) describes a world where
everyday objects are always connected to the Internet, allowing
them to communicate and interact with each other. By
connecting these everyday objects to the Internet and making
them available everywhere at any time, IoT allows to remotely
monitor, manage, and gather status information about them and
their surrounding environment. IoT is a revolutionary concept
that brought new experiences to everyday life and enabled Smart
City initiatives all over the world. These initiatives are using a
combination of technology paired with physical infrastructure
and services, to improve people’s quality of life. One of the high priority domain to support the Smart City’s vision is the field of
Smart Mobility. This paper reviews the current IoT approaches
and concepts related to Smart Cities and Smart Mobility. In
addition, it analyzes distinct features and numerous applications
covering both Intelligent Transportation and Real Time Traffic
Management Systems.info:eu-repo/semantics/publishedVersio
Overview of context-sensitive technologies for well-being
Today smart devices such as smartphones,
smartwatches and activity trackers are widely available and
accepted in most developed societies. These devices present a
broad set of sensors capable of extracting detailed information
about different situations of daily life, which, if used for good,
have the potential to improve the quality of life not only for
individuals but also for the society in general. One of the key
areas where this type of information can help to improve the
quality of life is in healthcare since it allows to monitor and infer
the current level of well-being of the smart devices carriers. In
this paper, some of the available literature about well-being
sensing through context-aware data is reviewed. Also, the main
types of mechanisms used in these studies are identified. These
mechanisms are related to monitoring, generalization, inference,
feedback, energy management and privacy. Furthermore, a
description of the mechanisms used in each study is presented.info:eu-repo/semantics/publishedVersio
PhysioVR: a novel mobile virtual reality framework for physiological computing
Virtual Reality (VR) is morphing into a ubiquitous
technology by leveraging of smartphones and screenless cases in
order to provide highly immersive experiences at a low price
point. The result of this shift in paradigm is now known as mobile
VR (mVR). Although mVR offers numerous advantages over
conventional immersive VR methods, one of the biggest
limitations is related with the interaction pathways available for
the mVR experiences. Using physiological computing principles,
we created the PhysioVR framework, an Open-Source software
tool developed to facilitate the integration of physiological signals
measured through wearable devices in mVR applications.
PhysioVR includes heart rate (HR) signals from Android
wearables, electroencephalography (EEG) signals from a low cost brain computer interface and electromyography (EMG)
signals from a wireless armband. The physiological sensors are
connected with a smartphone via Bluetooth and the PhysioVR
facilitates the streaming of the data using UDP communication
protocol, thus allowing a multicast transmission for a third party
application such as the Unity3D game engine. Furthermore, the
framework provides a bidirectional communication with the VR
content allowing an external event triggering using a real-time
control as well as data recording options. We developed a demo
game project called EmoCat Rescue which encourage players to
modulate HR levels in order to successfully complete the in-game
mission. EmoCat Rescue is included in the PhysioVR project
which can be freely downloaded. This framework simplifies the
acquisition, streaming and recording of multiple physiological
signals and parameters from wearable consumer devices
providing a single and efficient interface to create novel
physiologically-responsive mVR applications.info:eu-repo/semantics/publishedVersio
Supporting Students' Mental Health and Academic Success Through Mobile App and IoT
Smartphones have become devices of choice for running studies on health and well-being, especially
among young people. When entering college,students often face many challenges,such as adaptation
to new situations, establish new interpersonal relationships, heavier workload and shorter deadlines,
teamwork assignments and others. In this paper, the results of four studies examining students’ well being and mental health as well as student’s perception of challenges and obstacles they face during
their academic journey are presented. In addition, a mobile application that acts as a complement
to a successful tutoring project implemented at the authors’ University is proposed. The application
allows students to keep their schedules and deadlines in one place while incorporating virtual tutor
features. By using both, the events from the student’s calendar and his or her mood indicators, the
application sends notifications accordingly. These notifications encompass motivational phrases,
time management guidelines, as well as relaxation tips.info:eu-repo/semantics/publishedVersio