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조희근,진도훈,윤문철,Cho, Hee-Geun,Chin, Do-Hun,Yoon, Moon-Chul 한국생산제조학회 2009 한국생산제조학회지 Vol.26 No.3
The end-milling force behaviour is very complex and it is related to a de-noising phenomenon, so it is very difficult to detect and diagnose this static cutting force phenomenon. This paper presents a new method of filtering of end-milling force in end-milling operation using filter bank technique, based on the wavelet transform. In this paper by comparing the history of end-milling force using wavelet filtering the fundamental end-milling property of the wavelet transform is well reviewed and analyzed. This result of wavelet transform using filter bank shows the possible static prediction of end-milling force with severe dynamic properties such as chatter in end-milling operation.
정진석,조희근,윤문철,Jeong, Jin-Seok,Cho, Hee-Geun,Yoon, Moon-Chul 한국생산제조학회 2009 한국생산제조학회지 Vol.25 No.4
The worn crater wear geometry of coated tools after machining has been configured by using Confocal Laser Scanning Microscopy(CLSM) and the Wavelet-based filtering technique. The CLSM can be well suited to construct the three-dimensional crater wear on the rake surfaces of coated tips. However, The raw heightness data of HEI(height encoded image) acquired by CLSM must be filtered due to the electronic and imaging noise occurring in constructing the crater image. So the Wavelet-based filtering algorithm is necessary to denoise the shape features in a micro scales so as to realize accurate crater wear topography analysis. The crater wear patterns filtered enable us to predict the crater wear shape in order to study the tool wear evolution. The study shows that the technique by combining the CLSM and Wavelet-based filtering is an excellent one to obtain the geometries of worn tool rake surfaces over a wide range of surface resolution in a micro scale.
요추 추간판 탈출증의 한의학적 치료와 슬링운동 병행 치료 효과
양미성 ( Mi Sung Yang ),강대희 ( Dae Hee Kang ),기영범 ( Young Bum Ki ),박수곤 ( Su Gon Park ),조희근 ( Hee Geun Cho ),최진봉 ( Jin Bong Choi ),설재욱 ( Jae Uk Sul ),김선종 ( Sun Jong Kim ) 경락경혈학회 2010 Korean Journal of Acupuncture Vol.27 No.4
Objectives: Herniated lumbar intervertebral disc is common reason causing back pain. Lumbar stabilization exercise prevent back pain recurrence by strengthening lumbar muscles. Sling Exercise Therapy(SET) is a system for spinal muscle stabilization and strengthening using fixed string and mobile band. The purpose of this study is to investigate and measure the effectiveness of SET and oriental medicine for Herniated lumbar intervertebral disc. Methods: The subjects for this study are 40 patients suffering from Herniated lumbar intervertebral disc in our clinic. They were measured and compared by Visual Analogue Scale(VAS), 4 grades of recovery degree and sex, age, period of disease, disc herniation type, times of exercise. Results: In the above index, the score(VAS, 4 grades of recovery degree) improved after treatments. But they make no difference between sex, age, period of disease, disc herniation type and times of exercise. Conclusions: These results suggest that SET may be used for Herniated lumbar intervertebral disc for pain management and muscle strengthening as an essential treatment regardless of sex, age, period of disease and disc herniation type.