Byung Ju Dan

Free movimg pattern's Online Spanning Tree Coverage Algorithm

The coverage path planning algorithm can be defined as making integration the robots footprint identical to that of the target region [Choset]. The spanning tree coverage which is one of the coverage path planning algorithm is proved to be optimal in the sense that there is no repetitive coverage [Gabriely]. But the online version of spanning tee coverage shows spiral moving pattern which can cause severe localization problems. So we propose a free moving patterns online spanning tree coverage algorithm which can freely make any moving pattern to lessen the localization or moving patterns problem and meet the user request

Smart walker development based on experts' feedback for elderly and disabled

This paper introduces a smart mobile walker which was developed for elderly and disabled. It supports three features, which are walking aid, sit-to-stand aid, and electric scooter. Implementation of each function is briefly described. The overall performance of the smart mobile walker is evaluated by experts in rehabilitation hospitals and continuously being improved.

Development of smart mobile walker for elderly and disabled

This paper introduces a smart mobile walker which support walking aid, sit-to-stand aid, and electric scooter functions for elderly and disabled. It is designed for indoor use like rehabilitation hospital. It helps users exercise sit-to-stand motion, make gaits, and move place to place inside a facility. To support these functions, it changes its configuration. A smart device provides a GUI to communication with users. Detailed implementation of each function is described.

Hidden marker position estimation during sit-to-stand with walker

Motion capture analysis of sit-to-stand task with assistive device is hard to achieve due to obstruction on reflective makers. Previously developed robotic system, Smart Mobile Walker, is used as an assistive device to perform motion capture analysis in sit-to-stand task. All lower limb markers except hip markers are invisible through whole session. The link-segment and regression method is applied to estimate the marker position during sit-to-stand. Applying a new method, the lost marker positions are restored and the biomechanical evaluation of the sit-to-stand movement with a Smart Mobile Walker could be carried out. The accuracy of the marker position estimation is verified with normal sit-to-stand data from more than 30 clinical trials. Moreover, further research on improving the link segment and regression method is addressed.

Development of 2-DOF robotic exoskeleton for upper limb rehabilitation after stroke

This paper presents the development of 2-DOF robotic exoskeleton for upper limb rehabilitation after stroke. We focused on the powered exoskeleton which consists of a cable-driven mechanism actuated by brushless motors. Strain gages measured torques which loaded elbow flexion/extension and wrist pronation/supination axes. To begin each trials, sEMG (surface Electromyography) was used to detect the voluntary movements of subjects.

Development of 2-DOF powered exoskeleton for upper limb rehabilitation

In this paper, we introduce the 2-DOF robotic exoskeleton system for upper limb rehabilitation after stroke. We focused on the 2-DOF powered exoskeleton which consists of a cable-driven mechanism actuated by two motors. Strain gages measured torques which loaded elbow flexion/extension and wrist pronation/supination axes. sEMG(Electromyography) was used to detect the intentional movements of subjects to begin each training trials.

Tactile Temperature Analysis of Home Theater System

In this work, the tactile temperature of home theater systems under natural convection conditions has been investigated through numerical approaches and experiment. The CFD analysis method was used to observe temperature changes of both the case top and the heat source. Based on numerical simulation results, four types of steel sheet mock-up having different vent sizes and locations were tested. As a consequence of the experiments, relationships in temperature variation between the case top and the heat source were investigated and verified. In addition, by using the validated and improved vent system, a fanless home theater system was proposed under high heat dissipating heat sources.Copyright