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Publicações

Publicações por CEGI

2016

VUMO: Towards an Ontology of Urban Mobility Events for Supporting Semi-Automatic Visualization Tools

Autores
Sobral, T; Galvao, T; Borges, J;

Publicação
2016 IEEE 19TH INTERNATIONAL CONFERENCE ON INTELLIGENT TRANSPORTATION SYSTEMS (ITSC)

Abstract
This paper introduces VUMO, a visualization-oriented ontology that formalizes the knowledge about urban mobility events (e.g. ridership and travel intentions) and visualization techniques. It focuses on serving as a foundation for the development of semi-automatic visualization tools, while also facilitating the process of data integration. The ontology allows techniques to be characterized with human perception factors, so they can be considered when automatically infering recommended techniques for a dataset. The ultimate goal is to benefit transportation decision makers and foster the development of semantically rich visualization techniques. We propose a structured visualization workflow based on VUMO, and apply it to the development of a prototype featuring real data extracted from a journey planner mobile application.

2016

Challenging user interaction in Public Transportation Spider Maps: a Cobweb solution for the city of Porto

Autores
Maciel, F; Dias, TG;

Publicação
2016 IEEE 19TH INTERNATIONAL CONFERENCE ON INTELLIGENT TRANSPORTATION SYSTEMS (ITSC)

Abstract
In Public Transportation systems, accurate representation of information has been key for users to take the more advantages of the services and fulfil their travel needs. The Spider Map is a particular schematic representation to illustrate all travel possibilities from a given geographical location. Recently the Spider Map interaction and generation process automation have been studied, although there are yet different possibilities to explore in the technological approach and interactive solution fields. This research proposes the Cobweb solution, dissecting the components of an Interactive Spider Map, focusing on the interactive dynamic potential, the ways to represent information, challenging the existing standard. An implementation of this solution is evaluated using carefully designed user tests to validate the design decisions, taking into consideration different interaction alternatives for each phase of the map generation. The results show improvements regarding the traditional alternative, with positive user response, valuing highly context awareness and information features.

2016

Passenger Journey Destination Estimation From Automated Fare Collection System Data Using Spatial Validation

Autores
Nunes, AA; Dias, TG; Falcao e Cunha, JFE;

Publicação
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS

Abstract
A methodology for estimating the destination of passenger journeys from automated fare collection (AFC) system data is described. It proposes new spatial validation features to increase the accuracy of destination inference results and to verify key assumptions present in previous origin-destination estimation literature. The methodology applies to entry-only system configurations combined with distance-based fare structures, and it aims to enhance raw AFC system data with the destination of individual journeys. This paper describes an algorithm developed to implement the methodology and the results from its application to bus service data from Porto. The data relate to an AFC system integrated with an automatic vehicle location system that records a transaction for each passenger boarding a bus, containing attributes regarding the route, the vehicle, and the travel card used, along with the time and the location where the journey began. Some of these are recorded for the purpose of allowing onboard ticket inspection but additionally enable innovative spatial validation features introduced by the methodology. The results led to the conclusion that the methodology is effective for estimating journey destinations at the disaggregate level and identifies false positives reliably.

2016

Residential building resource consumption: A comparison of Portuguese municipalities' performance

Autores
Horta, IM; Camanho, AS; Dias, TG;

Publicação
CITIES

Abstract
The purpose of this paper is to develop a robust methodology to assess municipalities' performance concerning the consumption of resources in residential buildings. The assessment is carried out at a municipal level to inform decision makers about the relative position of their municipalities compared to others. In addition, the factors associated to better levels of municipal performance are identified, and the extent of their effects is quantified. The study uses an enhanced stochastic frontier panel model based on data of energy, water and materials consumption in Lisbon municipalities during the period 2003-2009. The study reveals that the municipalities' performance has remained stable over the years, although there are considerable differences in performance among municipalities. In addition, it is concluded that municipal performance tends to improve with the environmental policy expenditure and scale size, and decline with buildings' age, population density and the proportion of buildings with private ownership.

2016

Temporary user-centred networks for transport systems

Autores
Nunes, AA; Dias, TG; Zegras, C; Falcao e Cunha, JFE;

Publicação
TRANSPORTATION RESEARCH PART C-EMERGING TECHNOLOGIES

Abstract
The concept of Temporary User-Centred Networks (TUNs) for transport systems is introduced. Affinity in these networks is defined as the time-specific degree of equivalence between travel patterns of users in the system. TUNs reveal latent social structures typically invisible to their users, enabling circumstantial collaboration opportunities amongst them. To make TUNs explicit we quantify affinity as a combination of two measures: journey similarity and journey substitutability. In the urban public transport domain, TUNs enable the diffusion of knowledge across the system in real-time. This can assist passengers adjusting travel decisions to their preferences and objectives according to service status. An enriched Automated Fare Collection (AFC) system dataset is used to demonstrate the market potential of TUNs in the urban public transport domain.

2016

Specifying Modernization into Service-Oriented SaaS System in a Case of Public Transport Document Generator

Autores
Mahfudhi, MG; Dias, TG;

Publicação
EXPLORING SERVICES SCIENCE (IESS 2016)

Abstract
The alignment of the information technology implementation with the ever-changing business strategies in an enterprise drives modernization of the legacy system. However, the existing modernization contexts have not adequately addressed the focus of customer experience and service-orientation within the SaaS system development. This paper investigates the modernization process of legacy system into SaaS system using services concept through multidisciplinary approach. Several best practices are discussed to propose the Service-Oriented Modernization Framework (SOMF) which involves the maturity model for evolution roadmap identification, the service-oriented SaaS reference architecture, and the User-Centered Service-Oriented Software Reengineering (UCSOSR) methodology. An industrial case study is demonstrated by applying the framework to develop the public transport document generator as a service. The modernization process described in the framework provides a comprehensive and systematic guideline in developing a scalable system. In conclusion, this research, by integrating service analysis and design with SOA towards the SaaS modernization, enables the creation of an agile business model to achieve competitive advantages.

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