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About

About

José Machado da Silva obtained a PhD degree on electrical and computer engineering in 1998 and is currently an Associated Professor at the Faculty of Engineering of the University of Porto, and a Senior Researcher at INESC Porto. His teaching and research interests include analogue, mixed-signal, and RF VLSI design and test, signal processing, and biomedical electronics.

Interest
Topics
Details

Details

005
Publications

2019

A more rational selection of the behaviour factor for seismic design according to Eurocode 8

Authors
Macedo, L; Silva, A; Castro, JM;

Publication
Engineering Structures

Abstract
The main objective of the research presented in this paper is to assess the influence of a more rational selection of the behaviour factor (q) for the seismic design of steel moment-resisting frames (MRFs) according to Eurocode 8 (EC8). To this end, a large set of steel MRFs were designed using for code-prescribed behaviour factors as well as using the Improved Force-Based Design (IFBD) methodology for a more consistent selection of q. The seismic performance of the archetypes was assessed through nonlinear static and response-history analysis. The results point to the discrepancy between the design assumptions and the real response of the structures, as significant differences between the design base shear and the lateral strength of the frames were observed for frames designed with code-prescribed behaviour factors. Moreover, it is shown that IFBD-designed steel frames exhibit more uniform inelastic demands over the building height, as well as ductility demands more compatible with the design assumptions. Finally, the fragility and seismic risk assessment conducted shows that all building archetypes, regardless of the q-scenario considered, exhibit values of mean annual frequency of collapse that comply with limits available in the literature. © 2019 Elsevier Ltd

2019

Wearable sensor networks for human gait

Authors
Machado da Silva, J; Derogarian, F; Canas Ferreira, J; Grade Tavares, V;

Publication
Wearable Technologies and Wireless Body Sensor Networks for Healthcare

Abstract

2019

A precise low power and hardware-efficient time synchronization method for wearable systems

Authors
Derogarian, F; Canas Ferreira, J; Grade Tavares, V; Machado da Silva, J; Velez, FJ;

Publication
Wearable Technologies and Wireless Body Sensor Networks for Healthcare

Abstract

2019

A reliable wearable system for BAN applications with a high number of sensors and high data rate

Authors
Derogarian, F; Canas Ferreira, J; Grade Tavares, V; Machado da Silva, J; Velez, FJ;

Publication
Wearable Technologies and Wireless Body Sensor Networks for Healthcare

Abstract

2018

Design for Calibratability of a N-Integer Low-Frequency Phase-Locked Loop

Authors
Teixeira, RM; da Silva, JM;

Publication
2018 XXXIII CONFERENCE ON DESIGN OF CIRCUITS AND INTEGRATED SYSTEMS (DCIS)

Abstract
Process variations in MOS manufacturing processes tend to increase within each new technology node, leading to lower production yields, particularly those of analogue circuits, which are also sensitive to external perturbations that might force there performance to drift beyond there admissible tolerance margins. This issue is addressed here with the design of a calibratable N-Integer phase-locked loop (PLL) based frequency synthesizer. In the approach being proposed, a statistical analysis is carried out to know the sensitivity of the PLL performance to expected process, temperature, and voltage variations. A training data set is then identified and used to define the calibration law and the required calibration algorithm. Simulation results are presented that confirm its validity.

Supervised
thesis

2018

Redução do Lead Time de Entrega: Um Caso de Estudo na Indústria Farmacêutica

Author
Vasco Águeda Azevedo Carvalho de Sousa

Institution
UP-FEUP

2018

Gestão de dados de investigação do tipo experimental: casos de uso e contribuições para a melhoria da qualidade dos metadados

Author
Cristiana Sofia Pereira Landeira

Institution
UP-FEUP

2018

Gestão da Informação e Colaboração no Cluster Português da Indústria Automóvel

Author
João Nuno Fonseca Sousa

Institution
UP-FEUP

2018

Selection of important posts in the timeline of a social network

Author
Miguel Guilherme Perestrelo Sampaio Pereira

Institution
UP-FEUP

2017

Avaliação e Melhoria da Qualidade de Sinais ECG Adquiridos em Sistemas Vestíveis

Author
Cátia Rafaela Rodrigues Fernandes

Institution
UP-FEUP