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Publications

Publications by Armando Sousa

1997

Embedded fuzzy logic controller for drying oil filled transformers

Authors
Carvalho, AS; Sousa, AJM;

Publication
ISIE '97 - PROCEEDINGS OF THE IEEE INTERNATIONAL SYMPOSIUM ON INDUSTRIAL ELECTRONICS, VOLS 1-3

Abstract
Fuzzy Logic is a part of Artificial Intelligence science and provides for control of complex processes, where exact models are not applicable. Such a controller is necessary for the process of drying oil filled transformers. Indeed, this controller needs to tackle with a highly non-linear and time variant process. The development of the controller was fast and the implementation size very small. Its performance proved very robust whilst providing both good dynamical and steady-state behaviour.

2009

Soft Core Robot with Joint Wheel Motion Controller

Authors
Carvalhosa, A; Machado, P; Sousa, A; Alves, JC;

Publication
IECON: 2009 35TH ANNUAL CONFERENCE OF IEEE INDUSTRIAL ELECTRONICS, VOLS 1-6

Abstract
The goal of the "Soft Core Robot" project is to set the way for a robot with minimalistic component and pin count, based on custom computing. Additionally, the "Joint Wheel Motion Controller" specifically takes advantage of custom computing in order to privilege angular precision over linear velocity which is interesting for some applications including mobile robotics. The proposed "Soft Core Robot" is expected to produce a small but very powerful and versatile robot. The chosen processing platform is based on a FPGA plus Microprocessor in the same chip. The proposed example application is the Fire Fighting contest at Instituto Politecnico da Guarda, in Portugal. The Joint Wheel Controller is not yet fully operational but results for the control of a single motor are presented. The overall status of the project is addressed, as well as the pros and cons of the approaches taken.

2010

Survey on team tracking techniques applied to sports

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

Publication
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.

2012

Overcoming Motor-Rate Limitations in Online Synchronized Robot Dancing

Authors
Santiago, CB; Oliveira, JL; Reis, LP; Sousa, A; Gouyon, F;

Publication
INTERNATIONAL JOURNAL OF COMPUTATIONAL INTELLIGENCE SYSTEMS

Abstract
We propose an online sensorimotor architecture for controlling a low-cost humanoid robot to perform dance movements synchronized with musical stimuli. The proposed architecture attempts to overcome the robot's motor constraints by adjusting the velocity of its actuators and inter-changing the attended beat metrical-level on-the-fly. Moreover, we propose quantitative metrics for measuring the level of beat-synchrony of the generated robot dancing motion and complement them with a qualitative survey about several aspects of the demonstrated robot dance performances. Tests with different dance movements and musical pieces demonstrated satisfactory beat-synchrony results despite the physical limitations of the robot. The comparison against robot dance sequences generated without inter-changing the attended metrical-level validated our sensorimotor approach for controlling beat-synchronous robot dancing motions using different dance movements and facing distinct musical tempo conditions.

2012

Optimization Approach for the Development of Humanoid Robots' Behaviors

Authors
Cruz, L; Reis, LP; Lau, N; Sousa, A;

Publication
ADVANCES IN ARTIFICIAL INTELLIGENCE - IBERAMIA 2012

Abstract
Humanoid robots usually have a large number of degrees of freedom which turns humanoid control into a very complex problem. Humanoids are used in several RoboCup soccer leagues. In this work, the SimSpark simulator of the Simulation 3D will be used. This paper presents an automatic approach for developing humanoid behaviors based on the development of a generic optimization system. The paper describes the adopted architecture, main design choices and the results achieved with the optimization of a side kick and a forward kick. For both skills, the optimization approach allowed the creation of faster and more powerful and stable behaviors.

2011

Autonomous Robot Dancing Synchronized to Musical Rhythmic Stimuli

Authors
Santiago, CB; Oliveira, JL; Reis, LP; Sousa, A;

Publication
SISTEMAS E TECNOLOGIAS DE INFORMACAO, VOL I

Abstract
This paper presents a system that is able to control in real time a humanoid robot to perform dance movements to the rhythm of a music. The movements' coordination is performed with the aid of a music analyzer that estimates the beat of the music and calculates a prediction of the next inter-beat-interval (IBI). During the robot dancing performance, a dance movement is chosen from a pre-defined dance library and is executed on-the-fly by the robot. The movements' velocity, as well as the attended metrical-level, are adjusted in real time so that the movement can be executed within the time interval of two beats, and at the same time taking into consideration the robot motor-rates limitations. Results evince a good synchrony of the movement towards the analyzed rhythm, but points to the need of a careful design of the dance movements so they can be naturally executed on time.

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