Browsing by resource type "conference paper"
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- O 1.º Jardim-de-infância privado da cidade de Bragança – PortugalPublication . Castanheira, LuisO estudo que compõe o trabalho aqui apresentado sistematiza os resultados da investigação realizada sobre a história da 1a instituição particular de Educação Pré-escolar que surgiu em Bragança. A sua abertura foi no ano de 1956 durante o regime Salazarista, que influenciou profundamente a sociedade portuguesa que nunca se mobilizou para inscrever as questões educativas no centro das suas prioridades inadiáveis, senão a partir do final da década de 1960. A temporalidade em que decorre a análise das fontes empíricas sobre esta instituição estende-se, ao longo da segunda metade do século XX, mais precisamente durante o último período do Estado Novo e nos primeiros doze anos após o 25 de abril de 1974, períodos marcantes na sociedade portuguesa. Por um lado, moveram-me motivações pessoais e profissionais; por outro, a evidência, para mim cada vez mais tornada uma exigência, de que a História da Educação em Portugal ficará mais completa com a realização de estudos locais sobre educação em geral e a Educação de Infância em particular. Ao dar a conhecer todo o processo de criação e abertura de um jardim-de-infância privado num tempo onde ainda havia crianças não frequentavam a escola primária, é fundamental conhecer e valorizar a criação de instituições educativas em locais e tempos difíceis de o conseguir. Com este estudo procuro averiguar o espaço que a criança ocupou na sociedade do espaço em geral e nesta instituição em particular, na sociedade de Bragança. As principais fontes primárias em que me baseei consistem em material publicado: monografias e artigos de revistas pedagógicas, imprensa diária e periódica local (em especial o jornal Mensageiro de Bragança que se publica continuamente desde 1940),regional e nacional, legislação e por fim, mas não menos importante, algumas memórias de Educadoras de Infância, crianças que frequentaram esta instituição e o seu pessoal dirigente que trabalharam nesta instituição em estudo. Vale, portanto, ressaltar que é meu propósito, recriar a experiência desta instituição em Educação de Infância na cidade de Bragança e contribuir assim para uma formação mais completa e para uma melhor reflexão sobre a profissão de Educador de Infância. A história de uma instituição é um processo de investigação em que a instituição e a educação se articulam por ação dos sujeitos, situados num horizonte sócio-cultural que define a sua existência e o sentido de cada um face aos seus interesses, motivações e expetativas.
- 15 anos de investigação em contabilidade de gestão estratégica: uma meta-análisePublication . Pires, Rui A.R.; Alves, Maria C.G.; Rodrigues, Lúcia LimaThe main purpose of this paper is to analyse and understand the evolution of the strategic management accounting (SMA) literature by performing a meta-analysis of literature and critiquing of SMA papers published in the leading journals in the field covering fifteen years: 2000-2014 inclusive. We performed a descriptive meta-analysis of 43 SMA papers published in five top ranked accounting journals in order to provide a broad perspective of the field. We use a method and techniques previously employed in the field of management accounting to select and classify the papers. The main findings presented in the paper provide some light about the main topics studied, research settings, theories, methods, and primary data analysis used in SMA research. Therefore, this paper extends upon the previous literature reviews, by extending the scope and the time frame. In addition, this paper provides a meta-analysis of the SMA literature never done before in the field of the SMA.
- A 2.4 GHz wireless electronic shirt for vital signals monitoringPublication . Carmo, João Paulo; Mendes, P.M.; Couto, Carlos; Correia, José H.The paper presents a wireless sensor network for wireless electronic shirts. This allows the monitoring of individual biomedical data, such as the cardio-respiratory function. The solution chosen to transmit the body’s measured signals for further processing was the use of a wireless link, working at the 2.4 GHz ISM band. A radio-frequency (RF) CMOS transceiver chip was designed in the UMC RF 0.18 μm CMOS process. The power supply of the RF CMOS transceiver is of only 1.5 V, thus it can be supplied by a single coin-sized battery. The receiver has a sensibility of -60 dBm and consumes 6.2 mW. The transmitter delivers an output power of 0 dBm with a power consumption of 15.6 mW. Innovative topics concerning efficient power management was taken into account during the design of the RF CMOS transceiver.
- 2.4 GHz wireless sensor network for smart electronic shirtsPublication . Carmo, João Paulo; Mendes, P.M.; Couto, Carlos; Correia, José H.This paper presents a wireless sensor network for smart electronic shirts. This allows the monitoring of individual biomedical data, such the cardio-respiratory function. The solution chosen to transmit the body’s measured signals for further processing was the use of a wireless link, working at the 2.4 GHz ISM band. A radio-frequency transceiver chip was designed in a UMC RF 0.18 μm CMOS process. The power supply of the transceiver is 1.8 V. Simulations show a power consumption of 12.9 mW. Innovative topics concerning efficient power management was taken into account during the design of the transceiver.
- A 2.4-GHz RF CMOS transceiver for wireless sensor applicationsPublication . Carmo, João Paulo; Mendes, P.M.; Couto, Carlos; Correia, José H.The paper describes a radio frequency transceiver designed in UMC RF 0.18 µm CMOS process. This process has a poly and six metal layers, allowing the use of integrated spiral inductors (with a reasonable quality factor), high resistor value (a special layer is available) and a low-power supply of 1.8 V. This RF CMOS transceiver will be applied to implemented a wireless sensors network in a wireless electronic shirt for helping health professionals with rapid, accurate and sophisticated diagnostic concerning cardiopulmonary disease in order to evaluate the presence of breathing disorders in free-living patients. Without proper design, communication will increase network power consumption significantly because listening and emitting are power-intensive activities. Thus, in order to optimise power consumption, it was included in the design of the RF transceiver, the use of control signals. With these control signals it is possible to enable and disable all the transceiver subsystems. These signals allows for example to switch off the receiver when a RF signal is being transmitted, to switch off the transmitter when a RF signal is being received, and to put the transceiver in sleeping mode when neither RF signals are being transmitted, nor being received.
- A 2.4-GHz wireless sensor network for smart electronic shirts integrationPublication . Carmo, João Paulo; Mendes, P.M.; Afonso, José A.; Couto, Carlos; Correia, José H.A typical sensing module is composed of sensors, interface electronics, a radio-frequency (RF) CMOS transceiver and an associated antenna. A 2.4-GHz RF transceiver chip was fabricated in a UMC 0.18 μm CMOS process. The receiver has a sensibility of -60 dBm and consumes 6.3 mW from a 1.8 V supply. The transmitter delivers an output power of 0 dBm with a power consumption of 11.2 mW. Innovative topics concerning efficient power management was taken into account during the design of the transceiver. A solution of individual sensing modules allows a plug-and-play solution. The target application is the integration of a wireless sensor network in smart electronic shirts, for monitoring the cardio-respiratory function and posture.
- 21st century education: progress or doom?Publication . Martins, CláudiaThe reflection on teaching methods is as old as the hills and it has encouraged the introduction of new strategies and methodological approaches, especially since the 17th century. A brief historical overview of the primary methods in language learning since then enables us to realise the underlying, persistent thought in educators’ minds of all times that there must be a more complete, more perfect approach to provide pupils and students with success. Every new method presents itself as the ultimate answer for the painstaking question: How can we reach students and teach them something worthy of their future? Method after method, approach after approach dethrones the previous, proclaiming to the winds that it is the panacea for all evils and that a new dawn in education is to rise. However, we have yet to see this bright future of education, even if this constant struggle has fuelled our will to continue searching. In the 1970s, it was the communicative approach; a couple of decades later, project- and task-based learning. From the beginning of the new millennium on, technology has again been hailed as the definitive response, that enlightened manner to get hold of students’ attention and lead them through avenues of budding success. It has been become fashionable to publicise surveys and case studies on the miracle advantages of using Twitter and similar technologies in the classroom, persuading us that we have finally found the answer. Nonetheless, various studies emphasise the harmful effects of the excessive use of screens, social networks and virtual reality. From our standpoint, this may be an attempt to use the same gadgets students do – and convince them that we are on the same side of the fence – though the truth is that we are no more than “another brick in the wall” and we often feel the bricks are tumbling down. Education may no longer be heading for progress but rather for doom. In our attempt to obey to the winds of change, we have perhaps neglected the importance of high standards and quality, content and practice, of the human contact to establish the liaison between knowledge and feelings. Bearing in mind these considerations, our aim is thus to reflect upon the future of education and where it might lead us.
- 2D cloud template matching - a comparison between iterative closest point and perfect matchPublication . Sobreira, Héber; Rocha, Luís Freitas; Costa, Carlos M.; Lima, José; Costa, Paulo Gomes da; Moreira, António Paulo G. M.Self-localization of mobile robots in the environment is one of the most fundamental problems in the robotics field. It is a complex and challenging problem due to the high requirements of autonomous mobile vehicles, particularly with regard to algorithms accuracy, robustness and computational efficiency. In this paper we present the comparison of two of the most used map-matching algorithm, which are the Iterative Closest Point and the Perfect Match. This category of algorithms are normally applied in localization based on natural landmarks. They were compared using an extensive collection of metrics, such as accuracy, computational efficiency, convergence speed, maximum admissible initialization error and robustness to outliers in the robots sensors data. The test results were performed in both simulated and real world environments.
- 3D Simulator based on simTwo to evaluate algorithms in micromouse competitionPublication . Eckert, Lucas; Piardi, Luis; Lima, José; Costa, Paulo Gomes da; Valente, António; Nakano, Alberto YoshiroRobotics competitions are increasing in complexity and number challenging the researchers, roboticists and enthusiastic to address the robot applications. One of the well-known competition is the micromouse where the fastest mobile robot to solve a maze is the winner. There are several topics addressed in this competition such as robot prototyping, control, electronics, path planning, optimization, among others. A simulation can be used to speed-up the development and testing algorithms but faces the gap between the reality in the dynamics behaviour. In this paper, an open source realistic simulator tool is presented where the dynamics of the robot, the slippage of the wheels, the friction and the 3D visualization can be found. The complete simulator with the robot model and an example is available that allow the users to test, implement and change all the environment. The presented results validate the proposed simulator.
- 3D Simulator with hardware-in-the-loop capability for the micromouse competitionPublication . Piardi, Luis; Eckert, Lucas; Lima, José; Costa, Paulo Gomes da; Valente, António; Nakano, Alberto YoshiroRobotics competitions are a way to challenge researchers, roboticists and enthusiastic to address robot applications. One of the well-known international competition is the Micromouse where the fastest mobile robot to solve a maze is the winner. There are several topics addressed in this competition such as robot prototyping, control, electronics, path planning, optimization, among others while keeping the size of the robot as small as possible. A simulation can be used to speed-up the development and testing algorithms but faces the gap between a simulation and reality, specially in the dynamics behaviour. There are some simulation environments that allow to simulate the Micromouse competition, but in this paper, an Hardware-in-the-loop simulator tool is presented where the simulated robot is controlled by the same microcontroller used by the robot. By this way, the developed algorithms are tested and validated with the limitations and constraints presented in the real hardware, such as memory and processing capabilities. The robot dynamics, the slippage of the wheels, the friction and the 3D visualization are present in the simulator. The presented results show that the same code and hardware controlling the simulated and the real robot identically.