Abstract: An obstacle avoidance system having an ultrasonic sensor is provided. The system includes an ultrasonic sensor array having at least one ultrasonic sensor for measuring a distance to an obstacle using an ultrasonic wave, an orientation tracker for tracking a proceeding direction, an controller for receiving distance data and orientation data from the ultrasonic sensor array and the orientation tracker, respectively, and for determining an avoidance orientation based on the distance data and the orientation data, and an avoidance orientation guiding unit for informing the pedestrian of the avoidance orientation determined by the controller. The controller stores distance data for a certain number of previous frames and, if the controller determines that distance data of a first frame is noise, the distance data of the first frame is replaced with an average between the distance data of a frame prior to the first frame and the distance data of a frame after the first frame.

Abstract: A method for detecting signals in spatial multiplexing multiple-input multiple-output (MIMO) systems using a QR-decomposition with M (QRD-M) algorithm is provided. The method includes receiving signals, limiting upper and lower bounds of a complexity in a QR-decomposition with M (QRD-M) algorithm, and detecting the received signals using the QRD-M algorithm. The signal detecting method can effectively reduce the amount of operation generated while detecting signals, using the QRD-M algorithm where the upper and lower bounds of the complexity are limited.

Abstract: A system and method are disclosed, which controls congestion to efficiently transmit data through a network of grid node network in a grid computing environment where a large amount of data is processed.

Abstract: An obstacle avoidance system having an ultrasonic sensor is provided. The system includes an ultrasonic sensor array having at least one ultrasonic sensor for measuring a distance to an obstacle using an ultrasonic wave, an orientation tracker for tracking a proceeding direction, an controller for receiving distance data and orientation data from the ultrasonic sensor array and the orientation tracker, respectively, and for determining an avoidance orientation based on the distance data and the orientation data, and an avoidance orientation guiding unit for informing the pedestrian of the avoidance orientation determined by the controller. The controller stores distance data for a certain number of previous frames and, if the controller determines that distance data of a first frame is noise, the distance data of the first frame is replaced with an average between the distance data of a frame prior to the first frame and the distance data of a frame after the first frame.