Abstract
In this paper, we propose an algorithm that combine the restriction on motor's velocities and the kinematic model of Omni-Directional mobile robots to improve the trajectory's following. The algorithm verifies the reference velocities of the robot and redefine them if necessary, in order to prevent possible saturation on motor's velocities. Simulation results of the algorithm applied to an omnidirectional mobile robot are presented. Copyright © 2006 IFAC.

Abstract
This paper presents the experimental identification of the model's parameters of an omni-directional mobile robot with four wheels. The parameters related to dynamic equations are the viscous frictions, the coulomb frictions and the inertia moment of the robot. Two methods of parameters identification are described. A simulation environment and simulation results are presented. Copyright © 2006 IFAC.

Abstract
This paper presents a new architecture for coordinating multiple autonomous robots in the execution of cooperative tasks. The architecture is based on the definition of a strategy that uses different tactics, setplays and roles. Roles enable to configure individual behaviour by performing specific tasks using a given set of actions. The proposed architecture allows flexible and efficient multi-robot operation in dynamic environments. The paper also presents an application of the proposed architecture to a complex domain such as middle-size robotic soccer. Our architecture is also generally enough to be applied in different robotic soccer leagues and similar multi-robot problems. Copyright © 2006 IFAC.

Abstract
Some areas of knowledge require the application of new learning methods in order to motivate and involve the students in the learning process. This paper describes the rapid prototyping of mobile robots with the flexible, modular and educational LEGO™ Mindstorms platform, supporting activities on some mobile robotics topics like control, positioning estimation and reconfiguration. The diversity of involved areas (mechanics, electronics, control,...) illustrates quite well the inter-disciplinarity of robotics. Those who are taking their first steps in robotics, specially in mobile robotics, need tools that allow them to learn some introductory concepts. Copyright © 2006 IFAC.

Abstract
This paper presents a trajectory controller for an omni-directional mobile robot. The controller presents important features, as the possibility of defining different translation velocities and angular positions to the robot during the trajectory following. The parameters of the controller are optimizated based on trajectory following simulations, with the mobile robot model. Simulation and real results of trajectory following are presented.

Abstract
This paper presents the experimental dynamic parameters identification of an omni-directional mobile robot with four wheels. Three methods of parameters identification related to dynamic equations are described, the parameters are the viscous frictions, the coulomb frictions and the inertia moment of the robot. A simulation environment, simulation results and real results are presented.