FCT: CTS - Documentos de conferências internacionais
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- Visible Light Communication in Vehicular Communication ApplicationsPublication . Vieira, Manuel A.; Vieira, M.; Louro, Paula; Vieira, Pedro Manuel de Almeida Carvalho; UNINOVA-Instituto de Desenvolvimento de Novas Tecnologias; CTS - Centro de Tecnologia e SistemasThis paper addresses the issues related to the Visible Light Communication (VLC) usage in vehicular communication applications. We propose a Visible Light Communication system based on Vehicle-to-Vehicle, Vehicleto-Infrastructure and Infrastructure-to-Vehicle communications able to safely manage vehicles crossing through an intersection. By using the streetlamps, street lights and traffic signaling to broadcast information, the connected vehicles interact with one another and with the infrastructure. Using joint transmission, mobile optical receivers collect data, calculate their location for positioning and, concomitantly, read the transmitted data from each transmitter. As receivers and decoders, optical sensors with light filtering properties, are used. Bidirectional communication between the infrastructure and the vehicles is tested. To command the passage of vehicles safely queue/request/response mechanisms and temporal/space relative pose concepts are used. The results show that the innovative solutions for congested intersections are related to the introduction of split intersections. The results indicate that the V-VLC system increases safety by directly monitoring critical points such as queue formation and dissipation, relative speed thresholds, as well as inter-vehicle spacing.
- VLC Based Guidance System to Be Used by Mobile Users Inside Large BuildingsPublication . Vieira, M.; Vieira, Manuel A.; Louro, Paula; Fantoni, A.; Vieira, Pedro Manuel de Almeida Carvalho; UNINOVA-Instituto de Desenvolvimento de Novas Tecnologias; CTS - Centro de Tecnologia e SistemasThe main goal of this paper is a Visible Light Communication (VLC) based guidance system to be used by mobile users inside large buildings. This system is composed of several transmitters (ceiling luminaries), which transmit map information and path guidance messages. Mobile devices, with VLC support, decode the information. A mesh cellular hybrid structure is proposed. The luminaires, via VLC, deliver their geographic position and specific information to the users, making them available for whatever use they request. The communication protocol, coding/decoding techniques, and error control are examined. Bidirectional communication is implemented and the best route to navigate through venue calculated. We propose several guidance services and multi-person cooperative localization. By analyzing the results, it became clear that the system not only provides self-location, but also the capability to determine the direction of travel and to interact with information received in order to optimize the route towards a static or dynamic destination.
- Assessment for Computer Programming CoursesPublication . Barros, João Paulo; UNINOVA-Instituto de Desenvolvimento de Novas Tecnologias; CTS - Centro de Tecnologia e SistemasAs the large number of articles on teaching introductory programming seem to attest, teaching and learning computer programming is difficult. However, perhaps surprisingly, the assessment design for those courses does not seem to be the most studied aspect. This short position paper provides a structured set of options and alternatives to consider when choosing the assessment elements for a programming course. The objective is to promote additional reflection on several alternatives for each assignment, exam, or other assessment elements. Along with this presentation, we point to eventually valuable references. We believe the resulting information should be helpful and applicable to many other disciplines, but the focus is on computer programming courses.
- Configurable Templates for Assistive Technology Mobile AppsPublication . Garcia, Luís Filipe; Barros, João Paulo; Viriato, Cândida; CTS - Centro de Tecnologia e SistemasSimple computer activities have been used for a long time for cognitive and physical training in the context of rehabilitation or mental stimulation. An example is training the skills needed by users with special needs to access the computer through scanning access, which is an access method used by persons with major motor difficulties. The increased availability of less expensive mobile devices with large displays provides an ideal platform for these applications. This work-in-progress paper presents an ongoing work to empower rehabilitation therapists and special education teachers with no previous computer programming experience with a set of highly configurable apps supporting several types of activities for scanning access training. The apps are made available as open projects written in a block-based programming language. This way, they may be configurable by non-programmers while also allowing further changes depending on the programming skills of each rehabilitation therapist or special education teacher. This study intends to validate this approach among this group of users and formulate a set of guidelines concerning software architecture and organization and user interaction, to be used in the development of this kind of application.
- Continuous reinforcement operator applied to resilience in disaster rescue networksPublication . Jassbi, Javad J.; Ribeiro, Rita A.; Camarinha-Matos, Luis M.; Barata, José; Gomes, Maria Isabel; CTS - Centro de Tecnologia e Sistemas; UNINOVA-Instituto de Desenvolvimento de Novas Tecnologias; CMA - Centro de Matemática e AplicaçõesResilience measurement can be viewed as a multicriteria hierarchical decision making problem since calculating the final level of resilience involves measuring different criteria, at several hierarchical levels, and then merging the information together. In this paper, a resilience model for disaster rescue networks is discussed with a full-reinforcement operator, denoted continuous reinforcement operator. This approach is tested with different levels of reinforcement and the results are compared with those from a Fuzzy Inference System. The proposed approach offers interesting features to support balanced development of disaster rescue networks and facilitates managerial decisions by imposing standards for criteria to penalize or reward the information fusion process.
- Mapping patterns of co-innovation networksPublication . Urze, Paula; Abreu, António; CIUHCT - Centro Interuniversitário de História das Ciências e da Tecnologia; CTS - Centro de Tecnologia e SistemasIn recent decades a significant research effort has focused on the role of innovation in giving enterprises a competitive advantage, and of socio-economic growth in general. Using the debate about systems as frameworks for innovation and the mapping of stages of innovation as our starting point, this paper aims to introduce an approach to understand the role of different types of co-innovation networks in terms of their capacity to generate novelty in terms of processes and products. The paper’s empirical section is based on one case study about Portugal’s largest highway concessionaire.
- A JSON/HTTP communication protocol to support the development of distributed cyber-physical systemsPublication . Pereira, Fernando; Gomes, Luis; CTS - Centro de Tecnologia e Sistemas; UNINOVA-Instituto de Desenvolvimento de Novas TecnologiasCyber physical systems are often built using networks of components containing physical and computational resources, enabling the design of distributed applications that collect data from remote sensors and manipulate remote actuators, located on local networks or on far away locations. The communication protocol presented in this paper was designed to support the communication between components of distributed applications. In addition, it includes remote debug and monitoring capabilities, to support the detection and resolution of errors and design mistakes on nodes running on remote locations. Employing the JSON/HTTP standards, the proposed protocol is Web browser friendly, suitable for the creation of Web based applications and user interfaces, but it may be employed on most programming environments that offer libraries to support those standards. As it is based on HTTP, it can easily traverse most firewall configurations and used through proxies. Development of the proposed protocol started on the IOPTTools framework, but the current version was implemented as part of the IOPT-Flow framework, aiming the development of distributed CPS applications based on graphical formalism combining Petri nets and dataflows. Both tool frameworks are available at http://gres.uninova.pt.
- Automated rf-PERTE System for Room Temperature Deposition of TCO CoatingsPublication . Fernandes, M.; Vygranenko, Y.; Vieira, Maria Manuela de Almeida Carvalho; Lavareda, G.; Carvalho, C. Nunes De; Amaral, A.; UNINOVA-Instituto de Desenvolvimento de Novas Tecnologias; CTS - Centro de Tecnologia e Sistemas; DCM - Departamento de Ciência dos MateriaisIn this work we present a fully automated plasma-enhanced reactive thermal evaporation system (rf-PERTE) that can be used for the deposition of transparent metal oxide films without intentional heating of the substrate. The system and developed software enables the full control over critical deposition conditions such as mass flow of oxygen, process pressure, current flowing through crucible and rf-power. These parameters are automatically adjusted during the deposition thus keeping them in a narrow process window. This way, highly transparent and conductive coating can be deposited with a high degree of reproducibility of the optical and electrical characteristics. The resistivity of 9×10-4 Ω-cm and the peak transmittance of 90% in the visible spectral range were achieved for indium oxide films deposited on glass substrates. This technique is also suitable for the deposition of transparent conducting coatings in a wide range of plastic materials for flexible solar cells. In particular, we have successfully deposited indium oxide on PEN (polyethylene naphthalate) sheets with electrical and optical properties approaching the ones for films on glass.