We present Obstacle-aware Virtual Circuit geographic Routing (OVCR), a novel routing mechanism for obstacle-aware wireless sensor networks that uses the obstacle-free path computed by the sink to make the greedy forwarding of geographic routing dependable. OVCR discovers obstacle-free paths by the powerful sink as obstacles are detected. To bypass obstacles, the information of obstacle-free pat...

This paper generalizes the concept of velocity obstacles [3] to obstacles moving along arbitrary trajectories. We introduce the non-linear velocity obstacle, which takes into account the shape, velocity and path curvature of the moving obstacle. The non-linear v-obstacle allows selecting a single avoidance maneuver (if one exists) that avoids any number of obstacles moving on any known trajecto...

The eerie feeling attributed to photo-realistic human-like video game characters may serve as a usability obstacle leaving viewers dissatisfied with a particular character for a video game. This study investigates the relationships between user satisfaction and perceived strangeness and between user satisfaction and human-like appearance for virtual characters. 65 participants were asked to rat...

A new robot path planning methodology called obstacle accommodation has been introduced for robots in cluttered environments. This methodology does not attempt to avoid physical contact between a robot and obstacles. Instead, it controls the contact to prevent damage to the robot. Obstacle accommodation represents a new robotic paradigm in which obstacles can contact robots at unspecified posit...

Identification of genetic loci in complex traits has focused largely on one-dimensional genome scans to search for associations between single markers and the phenotype. There is mounting evidence that locus interactions, or epistasis, are a crucial component of the genetic architecture of biologically relevant traits. While discussion about the best way to identify models for complex traits is...

A new real-time obstacle avoidance approach for mobile robots has been developed and implemented. This approach permits the detection of unknown obstacles simultaneously with the steering of the mobile robot to avoid collisions and advancing toward the target. The novelty of this approach, entitled the Virtual Force Field, lies in the integration of two known concepts: Certainty Grids for obsta...

Based on a non-linear single track model which describes the dynamics of vehicle, an optimal path planning strategy is developed. Real time optimization is used to generate reference control values to allow leading the vehicle alongside a calculated lane which is optimal for different objectives such as energy consumption, run time, safety or comfort characteristics. Strict mathematic formulati...

For variational inequalities of an abstract obstacle type, a comparison principle for the dependence of solutions on the constraint set K is used to provide a continuity estimate.

Three diierent algorithms for qualitative obstacle detection are presented in this paper. Each one is based on diierent assumptions. The rst two algorithms are aimed at yes/no obstacle detection without indicating which points are obstacles. They have the advantage of fast determination of the existence of obstacles in a scene based on the solvability of a linear system. The rst algorithm uses ...

The aim of this paper is to present the concept of an ‘instrumental’ obstacle. In French agricultural education, the spreadsheet is often used as a tool or “artefact” in statistics teaching. Some obstacles to learning appear due to the use of this instrument. Difficulties appear during the learning of analysis of variance by students, who are not trained mathematicians. The concept of average h...