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49 results on '"Lee, Woosub"'

47. A safe joint with a joint torque sensor.

Author

Dong-Eun Choi, Gi-Hun Yang, Choi, Junho, Lee, Woosub, Cho, Changhyun, and Kang, Sungchul

Abstract

In this study, a safe joint with a joint torque sensor is presented. The safe joint, named “Spring-Clutch”, is a simple passive mechanism that consists of a spring, a cam, and a joint torque sensor. When the torque applied is less than a pre-set threshold, the Spring-Clutch acts as a rigid joint between the input and output. However, if the applied torque exceeds the threshold, the Spring-Clutch is released and acts as a revolute joint, which results in reduction of the collision force to prevent damage of human and robot. After the applied torque is removed, the Spring-Clutch is immediately re-engaged. In addition, a compact joint torque sensor is installed in the Spring-Clutch to measure the torque at the joint. This paper describes the design principles and performance evaluation of Spring-Clutch, and discusses practical applications to a joint mechanism for safe manipulator. [ABSTRACT FROM PUBLISHER]

Published
2011
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48. Artificial Neural Network enabling Clinically Meaningful Biological Image Data Generation.

Author

Ha J, Kim S, Baik Y, Lee D, Lee W, and Suh S

Subjects
Neural Networks, Computer
Abstract

Biological experiments for developing efficient cancer therapeutics require significant resources of time and costs particularly in acquiring biological image data. Thanks to recent advances in AI technologies, there have been active researches in generating realistic images by adapting artificial neural networks. Along the same lines, this paper proposes a learning-based method to generate images inheriting biological characteristics. Through a statistical comparison of tumor penetration metrics between generated images and real images, we have shown that forged micrograph images contain vital characteristics to analyze tumor penetration performance of infecting agents, which opens up the promising possibilities for utilizing proposed methods for generating clinically meaningful image data.

Published
2020
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49. Design And Experiment Of A Passive Sit-To-Stand And Walking (STSW) Assistance Device For The Elderly.

Author

Kim SW, Song J, Suh S, Lee W, and Kang S

Subjects
Aged, Biomechanical Phenomena, Humans, Muscle Strength, Sitting Position, Standing Position, Lower Extremity, Self-Help Devices standards, Walking
Abstract

Most elderly people complain about the discomfort of movements such as a sit-to-stand (STS) motion through losing their muscular strength of lower extremity over aging. This paper presents a novel passive sit-to-stand and walking (STSW) assistance device to aid in physical support for indoor daily life of the elderly. The STSW assistance device is actuated by a pneumatic cylinder and a gas spring. The standing motion is driven by extension of actuators and the sitting motion is driven naturally with gravitational force of user's weight that reloads actuators. The effect of physical support by using this device was evaluated by experiment with measuring electromyograph signals of subjects during STS motion. As a result, the reduction rate of average maximal voluntary isometric contraction with assistance by the STSW device is about 51.2%. This means that users with the assistive device can stand up by using only about half of muscular activation in the case of natural standing up.

Published
2018
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