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Publicações

Publicações por CRIIS

2011

PhenoSat - A tool for vegetation temporal analysis from satellite image data

Autores
Rodrigues, A; Marcal, ARS; Cunha, M;

Publicação
2011 6th International Workshop on the Analysis of Multi-Temporal Remote Sensing Images, Multi-Temp 2011 - Proceedings

Abstract
The availability of temporal satellite image data has increased considerably in recent years. A number of satellite sensors currently observe the Earth with high temporal frequency thus providing a tool for monitoring/understanding the Earth-surface variability more precisely, for several applications such as the analysis of vegetation dynamics. However, the extraction of vegetation phenology information from Earth Observation Satellite (EOS) data is not easy, requiring efficient processing algorithms to properly handle the large amounts of data gathered. The purpose of this work is to present a new, easy-to-use software tool that produces phenology information from EOS vegetation temporal data - PhenoSat. This paper describes PhenoSat, focusing on two new features: the determination of the beginning and maximum of a double growth season, and the selection of a temporal sub-region of interest in order to reduce and control the data evaluated. © 2011 IEEE.

2010

Survey on team tracking techniques applied to sports

Autores
Santiago, CB; Sousa, A; Estriga, ML; Reis, LP; Lames, M;

Publicação
IEEE 2010 International Conference on Autonomous and Intelligent Systems, AIS 2010

Abstract
Recent years have brought an increasing interest on analyzing efficiently the performance of sports players during training sessions and games. The information collected from such analysis is very valuable to educators and coaches since it allows them to better understand the difficulties of a trainee, a player or even an entire team and formulate adequate training and strategic plans accordingly. In order to perform this analysis in a consistent and systematic way, sophisticated sensory systems and data processing techniques are needed. This paper presents a survey on relevant work, current techniques and trends on the area of team tracking systems applied to sports. We propose a classification of these systems by distinguishing them into two main categories: intrusive and nonintrusive. Nonintrusive systems are further refined into outdoor and indoor sports applications. The specific characteristics of each system are itemized, including the identification of the strong points and limitations. Finally, the paper highlights some open issues and research opportunities on this area. © 2010 IEEE.

2010

Applying usability principles to the design of a web interface for the "iLab - Inventory Manager for Electronics Laboratory"

Autores
Pinho, R; Sousa, A; Restivo, A;

Publicação
SISTEMAS Y TECNOLOGIAS DE INFORMACION

Abstract
This paper presents a case study of an existing web application of inventory management for electronics laboratories, accounting for usability principles and best practices for user interface design. The iLab project efficiently manages the inventory, requests, users (borrowings, purchases, etc.) and associated historic and workflow information. This enables users to queue requests and track their statuses. Usability is critical for for the success of such application. A web based interface is to be designed using usability principles, making sure all end-users use the application in an intuitive and effective way. To achieve these goals the study consisted on four phases: plan, analyze, design and, test and refine. After this study it has been concluded that with this methodology developers are able to create more user-friendly and efficient applications.

2010

FEUP Fuzzy Tool II Improved tool for education and embedded control

Autores
Pegoraro, EM; Sousa, A;

Publicação
SISTEMAS Y TECNOLOGIAS DE INFORMACION

Abstract
An innovative software called FEUP Fuzzy Tool was developed by professor and students as a teaching tool to support the control of non-linear systems using the computational resources available. It is based on the theory of Fuzzy Logic control. The tool is currently used for investigation and educational purposes. This document briefly describes and validates through some example applications the current release of the toolbox which makes it one of the most complete and advanced fuzzy logic software available. The present tool now includes Neuro Fuzy optimization, visual debugging and run time control on the PC or in an embeddable platform.

2010

HUMANOID LOW-LEVEL CONTROLLER DEVELOPMENT BASED ON A REALISTIC SIMULATION

Autores
Lima, JL; Goncalves, JC; Costa, PG; Moreira, AP;

Publicação
INTERNATIONAL JOURNAL OF HUMANOID ROBOTICS

Abstract
This article describes a joint trajectory optimized controller developed in a humanoid robot simulator following the real robot characteristics. As simulation is a powerful tool for speeding up the control software development, the proposed accurate simulator allows to fulfill this goal. The simulator, based on the Open Dynamics Engine and GLScene graphics library, provides instant visual feedback. The proposed simulator, with realistic dynamics, allows to design and test behaviors and control strategies without access to the real hardware in order to carry out research on robot control without damaging the real robot. The low-level joints controller techniques, such as acceleration, speed, and energy consumption minimization, are discussed and experimental results are presented in order to validate the proposed simulator.

2010

Fostering advances in mechatronics and robotics resorting to simulation

Autores
Goncalves, J; Lima, J; Malheiros, P; Costa, P;

Publicação
IFAC Proceedings Volumes (IFAC-PapersOnline)

Abstract
This paper presents the modelling and simulation of a wheeled mobile robot designed to operate in structured environments and the development of robot software based on its simulation. The mobile robot was simulated resorting to the SimTwo, a custom made simulator developed by the authors with the purpose to test and produce control software for industrial, humanoid and wheeled robots. The presented example is in the field of edutainment robotics, being presented the localization and navigation in a Fire Fight Robot Contest arena of an omnidirectional mobile robot equipped with brushless motors and infra-red distance sensors. Edutainment robotics plays an important role in education due to the inherent multi-disciplinary concepts that are involved, motivating students to technological areas. It also plays an important role in research and development, because it is expected that the outcomes that will emerge here, will later be transfered to other application areas, such as service robots and manufacturing.

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