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The synchronized trajectory tracking control problem of multiple mobile robots under actuator faults is studied in this paper. We take the communication delays into consideration in system design and do not require that the network topology is symmetric. A distributed control design approach is proposed by incorporating the synchronized formation control method and a sufficient condition is obtained...
Introducing robots into the operating theatre has become more popular in recent decades. Surgical manipulators have been developed to assist in surgeries like a human assistant to facilitate the surgical procedures. In this paper, we present an eye-controlled interface for the surgeon to control this kind of robot based on eye-tracking glasses. In our approach, we use the monitor for providing the...
Magnetic Resonance Imaging (MRI) presents better performance in breast imaging compared to computed tomography or ultrasound, however, its image quality critically depends on the stabilization of breast tissues during interventions. Conventionally, 2D compression plates for immobilization have been used by various researchers, however, not only do these plates cause anatomical distortion and patient...
The paper presents a real-time and reliable communication system for a newly developed hybrid underwater robotic vehicle (HURV). The surface monitoring station of the HURV is linked with the onboard underwater control system by a fine and neutral buoyance fiber, which enables the state monitoring and tele-operation mode of the vehicle based on the industrial Ethernet Modbus/TCP via the fiber-optic...
In this paper, we address the positioning problem of remote centre of motion (RCM) mechanisms with uncalibrated image feedback from a monocular camera. Nowadays, RCM mechanisms are widely used in minimally invasive robotic surgery due to their ability to distally rotate a tool around a fixed entry port; note that in most surgical applications, the tools are typically controlled by manual/teleoperated...
This paper studies the performances of the popular gradient-based formation-control strategies for teams of autonomous agents when the agents' range measurements are coarse. Since the dynamics of the resulting closed-loop system are discontinuous, Filippov solutions to non-smooth dynamical systems are introduced. Similar to the existing stability results for triangular formations with precise range...
Indoor aerial robots are useful in many applications due to their size, agility and ability to hover. However, tweaking a state-feedback controller to fly stably takes either intensive human supervision, or extensive modeling and identification, hence has never been trivial. In this paper, we give a successful flight controller design that can learn from a single demonstration performed by human and...
Reinforcement learning (RL) has been applied to a wide range of motion control problems in robotics. In particular, policy gradient method (PGM) emerges as a powerful subset of RL that can learn effectively from one's experience. However, when the dynamics is stochastic and is short of samples for learning, the performance of PGM becomes inconsistent and heavily relies on the tweaking of the learning...
Notice of Violation of IEEE Publication Principles"A Combined Scheduling Scheme for Absolute and Relative Differentiated Services in Web-based Teleoperation"by Qing-Yun Li and Yun-Hui Liuin the Proceedings of the 2009 IEEE International Conference on Mechatronics and Automation, August 2009After careful and considered review of the content and authorship of this paper by a duly constituted...
This paper presents an illumination adaptive color object recognition method for robot soccer match. Generally, the colors are identified by referring to the pre-defined bounds for the components of each color. However, it is not an easy work to define non-interfered bounds for different colors, and the bounds are sensitive to illumination conditions. Instead, in this work, different colors are discriminated...
This paper presents a novel adaptive controller for image-based visual servoing of robots with an uncalibrated eye-in-hand camera using line features. The controller is developed based on three key ideas. First, we propose a new method that is similar to the Plucker coordinates, to represent projections of the lines features. The new representation leads to a depth-independent image Jacobian matrix...
This paper presents a novel adaptive controller for image-based visual servoing of robots with an eye-in-hand camera using angle and distance features. The key idea lies in the development of the depth-independent interaction matrix and the proposal of an adaptive algorithm for estimating the unknown geometric parameters of the features in the 3-D space. The Lyapunov theory is used to prove the asymptotic...
This paper presents a novel approach for image-based visual servoing of a robot manipulator with an eye-in-hand camera when the camera parameters are not calibrated and the 3-D coordinates of the features are not known. Both point and line features are considered. This paper extends the concept of depth-independent interaction (or image Jacobian) matrix, developed in earlier work for visual servoing...
This paper presents a novel algorithm, called ISOGRID (isometric grid-based algorithm), for autonomous deployment of mobile sensor networks. Upon an initial random placement of sensor nodes, the algorithm iteratively computes node movements to enhance sensing coverage and avoid obstacles while ensuring sensor connectivity. The principle is to redeploy the sensor nodes such that the communication graph...
This paper presents a new adaptive controller for a robot manipulator to control position of projections of unknown targets using the visual feedback from an eye-in-hand camera. The controller is designed to cope with the case when the intrinsic and extrinsic parameters of the camera are not calibrated. The controller employs the depth-independent image Jacobian to map the errors on the image plane...
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