PAI-1 Expressa no Infiltrado Inflamatório Intratumoral em Pacientes com Carcinoma Epidermoide de Cavidade Oral

PAI-1 Expressa no Infiltrado Inflamatório Intratumoral em Pacientes com Carcinoma Epidermoide de Cavidade Ora

Os determinantes da estrutura de capital de empresas do PSI-20

In this paper, the intention is to analyse the capital structure features of the companies operating in the Portuguese Capital Market (PSI-20). A panel analysis allows the studying of relationships between debt level and those factors which financial literature considers as determining for capital structure: size, tangibility, growth opportunities, operational risk, non-debt tax shields, profit, dividend payout, and stock price performance. This empirical study purports to describe the effects of these variables on the companies' debt level.info:eu-repo/semantics/publishedVersio

Smart load cells: an industrial application

This paper presents a data acquisition solution using a RISC type microcontroller with a very few components around, taking advantage of the ratiometric functioning of the load cells. The need of thermally stable circuits is minimized through the use of the same amplification chain for both signal and reference. The amplification and filtering are done trough switched-capacitor techniques controlled by the microcontroller. This option allows the choice of the proper scale according to the platform and permits the auto-calibration of the system. The weighing tests show errors below 100 gr in 400 kg for an industrial platform of 8 smart load cells. The paper also describes an example of software calibration of a multi-load cell weigh-bridge using one processor per smart load cell

MODUS: uma metodologia de prototipagem de interfaces baseada em modelos

A interface de utilizador é essencial para o sucesso de uma aplicação, ora a sua implementação requer tempo e esforço. Metodologias baseadas em modelos suportadas por uma geração automática têm sido propostas como solução para reduzir os custos de desenvolvimento. No entanto, um elevado nível de automação nestas abordagens requer o uso de modelos detalhados da interface, originando complicações. Por um lado, esta perspetiva é contrária a uma conceção baseada no progressivo refinamento de mockups, típica do desenvolvimento de interfaces. Por outro lado, obriga uma distinção entre os modelos utilizados na lógica de negócio e na interface. Este artigo propõe uma abordagem para gerar a interface de utilizador baseada diretamente em modelos estruturais da lógica de negócio. A identificação do domínio de aplicação é um factor chave da metodologia, permitindo automatizar o processo de geração. Por sua vez a separação entre conteúdo e forma favorece o refinamento iterativo das interfaces geradas.info:eu-repo/semantics/publishedVersio

Usability evaluation of the uCat tool

The uCat tool supports use cases specification, aiming at the generation of architectural prototypes, as per the SCARP approach. This short paper reports on the evaluation of its usability, a major factor in tool adoption by potential users.Este trabalho e financiado por Fundos FEDER através do Programa Operacional Competitividade e Internacionalização – COMPETE 2020 e por Fundos Nacionais atraves da FCT - Fundação para a Ciência e a Tecnologia no âmbito do projeto «POCI-01-0145-FEDER-006961».info:eu-repo/semantics/publishedVersio

From requirements to UI prototypes: a semi-automated approach

Software development poses multiple challenges, from requirements specification to final software production. We have developed two approaches, focused on complementary aspects of the problem. On the one hand, SCARP supports obtaining architectural models (hence, business layer code) from requirements models. On the other, MODUS produces UI prototypes from architectural models. This work presents their integration to obtain a development cycle going from requirements to executable prototypes, supported by semi-automated processes.Este trabalho e financiado por Fundos FEDER através do Programa Operacional Competitividade e Internacionalização – COMPETE 2020 e por Fundos Nacionais atraves da FCT – Fundação para a Ciência e a Tecnologia no âmbito do projeto POCI-01-0145-FEDER-006961.info:eu-repo/semantics/publishedVersio

Acquisition the profile of surfaces with complementary sensor fusion techniques

This paper presents complementary sensor fusion techniques for the acquisition of the profile of surfaces with minimum error using low cost sensors ultrasonic sensors. These surfaces are composed by areas with different depths, corners and specular surfaces. To minimize the constraints of sonar sensors, it was developed dedicated software and hardware, as well as an empirical model was obtained from real data. This model is based in two proposed concepts: Points of Constant Depth (PCD) and Areas of Constant Depth (ACD). Having this sonar model in mind, four sensor fusion techniques are used separately to validate the PCDs and decide the ACDs: average and variance, fuzzy controller and heuristic method based in rules. In this work a PUMA 560 manipulator was equipped with a CCD video camera on the shoulder and four ultrasonic sensors on the wrist, to acquire data to model the geometry of the part’s surface, exploiting the mobility of the robot. The CCD camera view defines the working area, while the ultrasonic sensors enable the acquisition of the surface profile. For the acquisition of the profile of surfaces with a minimum error different and complementary sensor fusion techniques are implemented and applied separately, namely the average and variance, kalman filter, fuzzy controller and heuristic method based in rules