Welcome to the Open Repository of the University of Porto!
The Open Repository collects, preserves and publishes the intellectual and scientific production of the academic community of U.Porto. It ensures an open and free access to the full text version of documents whenever it is authorized by the authors.
The repository is organized in Communities and Collections: the first correspond to organic entities of U.Porto and the latter comprise the outputs of each community organized by types of documents – articles, books, chapters of books, master and doctoral thesis, posters, reports and others.
Publications are all covered by Creative Commons public license and it is strictly forbidden any use that is not authorized by it.
E-legging for monitoring the human locomotion patterns
Human motion capture systems help clinicians to detect and identify mobility impairments, early stages of pathologies and evaluate the effectiveness of surgical or rehabilitation intervention. Although there is a considerable number of solutions presently available, these systems are often expensive,&...
A special class of mixed constrained optimal control problems
The focus of this paper is on optimal control problems with mixed state and control inequality constraints. We identify a class of problems which can be associated with an auxiliary problem with both regular mixed constraints and pure state constraints. For that class of probl...
An integral-type constraint qualification to guarantee nondegeneracy of the maximum principle for optimal control problems with state constraints
For optimal control problems involving ordinary differential equations and functional inequality state constraints, the maximum principle may degenerate, producing no useful information about minimizers. This is known as the degeneracy phenomenon. Several non-degenerate forms of the maximum principle, vali...
Reference Governor Strategies for Vehicle Rollover Avoidance
This paper addresses the problem of vehicle rollover avoidance using reference governors (RGs) applied to modify the driver steering input in vehicles with an active steering system. Several RG designs are presented and tested with a detailed nonlinear simulation model. The vehicle dyna...
REIT - Reitoria 249