This paper proposes a method to deal with holes healing problems in wireless hybrid sensor networks. With recent advances in mobile platforms, hybrid sensor networks including static and mobile sensors are becoming very popular technology. In this paper, we investigate the coverage hole healing efficiency and propose a method to improve the efficiency. Specifically, mobile sensors can dynamical...

path planning and obstacle avoidance 1 R. Glasius A. Komoda S. Gielen Department of Medical Physics and Biophysics, University of Nijmegen, Geert Grooteplein Noord 21, 6525 EZ Nijmegen, The Netherlands, Abstract A model of a topologically organized neural network of a Hop eld type with nonlinear analog neurons is shown to be very e ective for path planning and obstacle avoidance. This determini...

This paper presents an approach to on-line path planning for multiple robots in configuration space. On the basis of defining some points in workspace as fmdamental obstacles, we develop an efficient algorithm for mapping a complex Cartesian obstacle by selecting obstacle's critical points. Its computational time for mapping a two-dimensional obstacle is approximately 5ms with a 33Mhz 80486 CPU...

We report on the experimental observation of vortex cluster shedding from a moving obstacle in an oblate atomic Bose-Einstein condensate. At low obstacle velocities v above a critical value, vortex clusters consisting of two like-sign vortices are generated to form a regular configuration like a von Kármán street, and as v is increased, the shedding pattern becomes irregular with many different...

We consider the collision of a dark soliton with an obstacle in a quasi-onedimensional Bose condensate. We show that in many respects the soliton behaves as an effective classical particle of mass twice the mass of a bare particle, evolving in an effective potential which is a convolution of the actual potential describing the obstacle. Radiative effects beyond this approximation are also taken...

We consider the collision of a dark soliton with an obstacle in a quasi-onedimensional Bose condensate. We show that in many respects the soliton behaves as an effective classical particle of mass twice the mass of a bare particle, evolving in an effective potential which is a convolution of the actual potential describing the obstacle. Radiative effects beyond this approximation are also taken...

The aim of this work is to implement a hybrid approach able to provide an efficient solution of the electromagnetic coupling between an antenna and an obstacle distant few meters away. The idea is to divide the problem into a small number of less complex sub-problems exploiting the advantage of generating the admittance matrix that describes the scattering problem by a numerical code. To this e...

This paper describes a realtime omnidirectional stereo system and its application to obstacle detection and tracking for a mobile robot. The stereo system uses two omnidirectional cameras aligned vertically. The images from the cameras are converted into panoramic images, which are then examined for stereo matching along vertical epipolar lines. A PC cluster system composed of 6 PCs can generat...

A coordinated control framework for multiagent systems using sliding mode control approach was developed in (Ghasemi and Nersesov, 2013). The framework addresses a general class of underactuated agents and presents a specialization to the agents represented by wheeled mobile robots. In this paper, we extend the results of (Ghasemi and Nersesov, 2013) to incorporate the obstacle/collision avoida...

The statistics of persistent events, recently introduced in the context of phase ordering dynamics, is investigated in the case of the one-dimensional lattice random walk in discrete time. We determine the survival probability of the random walker in the presence of an obstacle moving ballistically with velocity v, i.e., the probability that the random walker remains up to time n on the left of...