In this paper we show that it can be decided in polynomial time whether or not the visibility graph of a given point set is 4-colourable, and such a 4-colouring, if it exists, can also be constructed in polynomial time. We show that the problem of deciding whether the visibility graph of a point set is 5-colourable, is NP-complete. We give an example of a point visibility graph that has chromat...

In this article we address the problem of catching objects that move at a relatively large distance from the robot, of the order of tens of times the size of the robot itself. To this purpose, we adopt casting manipulation and visual-based feedback control. Casting manipulation is a technique to deploy a robotic end-effector far from the robot's base, by throwing the end-effector and controllin...

Toward the goal of robots performing robust and intelligent physical interactions with people, it is crucial that are able to accurately sense human body, follow trajectories around track motion. This study introduces a capacitive servoing control scheme allows robot navigate limbs during close interactions. Capacitive leverages temporal measurements from multielectrode sensor array mounted on ...

according to general circulation model (gcm), zonal thermal belts are 1- inter-tropical convergence zones (itcz) around eqator; 2- sub tropical high (sth) belt around 30 degree latitude; 3- sub polar low (spl) belt around high latitudes. the belt of inter-tropical convergence zone (itcz) displaces in meridional path, about 5° over the oceans and up to 40° over continents, during the seasons of ...

All of the Degrees of Freedom including of position and orientation of the end-effector of a spatial cable robot are sensed and recorded with a new sensor fusion method in this paper for being used as feedback. This goal is achieved by employing a hybrid methodology of image processing and distance measurement device. The advantage of the proposed algorithm over encoder solution is its higher a...

The ability to perform different tasks by a serial manipulator mounted on legged robots, increases the capabilities of the robot. The position/force control problem of such a robot in the stance phase with point contacts on the ground is investigated here. A target plane with known stiffness is specified in the workspace. Active joints of the legs and serial manipulator are used to exert the de...