The obstacle avoidance problem in geographic forwarding is an important issue for location-based routing in wireless sensor networks. The presence of an obstacle leads to several geographic routing problems such as excessive energy consumption and data congestion. Obstacles are hard to avoid in realistic environments. To bypass obstacles, most routing protocols tend to forward packets along the...

An obstacle avoidance algorithm: the Weighted Safety Vector Field (WSVF) method is presented. In determining the orientation of the mobile robot, the algorithm rst computes the primary steering angle for normal maneuvering which is derived based on the fuzzy inference rule. To cope with the constrained environments such as corner and hallway, the algorithm then computes the secondary steering a...

Abstract: A four-wheeled autonomic trolley of obstacle avoidance is controlled by way of front-wheel steering and backwheel driving. Three pairs of ultrasonic sensors are, respectively, installed on the left front, front and right front of the trolley in order to measure the distances between obstacles and the trolley. Its control strategy is derived from the concept of path planning for mobile...

Plate heat exchangers are widely used in industries due to their special characteristics, such as high thermal efficiency, small size, light weight, easy installation, maintenance, and cleaning. The purpose of this study is to consider the effect of depth, angle, and pitch of hemispheric Chevrons on the convective heat transfer coefficient and pressure drop. In the simulation of the heat ex...

Plate heat exchangers are widely used in industries due to their special characteristics, such as high thermal efficiency, small size, light weight, easy installation, maintenance, and cleaning. The purpose of this study is to consider the effect of depth, angle, and pitch of hemispheric Chevrons on the convective heat transfer coefficient and pressure drop. In the simulation of the heat ex...

In this note we investigate the behavior of polar tangential angle a general plane curve, and in particular prove its monotonicity for certain curves monotone curvature. As an application give (non)existence results obstacle problem involving free elasticae.

Obstacle avoidance methods for mobile robots have proposed in a broad range of studies and the availabilities have been discussed. Most of these studies regard the robots as points or circles and control methods of the translational movements are discussed. In these studies, it is pointed out that a non-circle robot can be transformed into a point robot by expanding the obstacles by the largest...