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남용(Nam Yong),김광호(Kim Gwangho),권정근(Kwon Jeonggeun),임종철(Im Jongchul),서재찬(Seo Jeochan) 한국지반환경공학회 2010 한국지반환경공학회논문집 Vol.11 No.3
흙채움 마대는 현장의 재료를 사용하여 간편하게 사면 및 제방의 복구나 보강에 사용되고 있다. 이런 흙채움 마대의 전단저항력을 증가시키기 위해 흙채움 마대 상?하면에 벨크로(Velcro)를 부착한 흙채움 마대가 개발되었으며, 벨크로를 부착한 흙채움 마대의 역학적 특성을 분석하기 위해 대형직접전단실험과 원호파괴를 가정한 실내모형실험이 수행되었다. 실제 벨크로가 부착된 마대를 이용해 사면을 설계하기 위해 흙-토목섬유 요소실험을 실시하여 강도정수를 파악하였다. 그리고 사면형성 시 벨크로와 흙채움 마대가 혼재하고 있기 때문에 정확한 파괴면을 알 수 없다. 따라서 실내모형실험을 통해 내적파괴에 대한 거동을 분석하고, 역해석을 통해 설계강도정수를 제안하였다. 흙-토목섬유의 요소실험결과, 벨크로의 부착으로 인해 흙채움 마대 상호간의 전단저항 정수인 내부마찰각과 점착력의 증가가 나타났으며, 특히 내부마찰각보다는 점착력의 뚜렷한 증가가 나타난 것으로 분석되었다. 또한, 실내모형실험 결과, 지지력이 20%이상 증가해 대형장비의 주행성 증가와 시공속도의 증대를 가져올 것으로 판단된다. In this study, Generally sandbag was used to reinforce slope or restore levee by using the in-situ material. To increase shear strength of sandbag, the Velcro system was effective for geosynthetic interface and make up for the weakness of shear strength between sandbag to sandbag. In this study, shear properties of geosynthetic-geosynthetic and geosynthetic-soil were evaluated from large scale direct shear tests. The cohesion and the angle of internal friction of each interface was evaluated. And laboratory model tests were performed to compare strength of reinforcement with strength of none reinforcement. As a result of this study, the cohesion and the angle of internal friction of each interface was increased, especially the cohesion was increased more than the angle of internal friction. Also according to the result of model test, the bearing capacity was increased by 20%.
이중평행사변형 구조의 원격중심운동 메커니즘에 관한 연구
정상화(Sanghwa Jeong),김광호(Gwangho Kim),임성빈(Sungbeen Im) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6
Implant surgery is generally accepted as the good technique to replace the teeth completely. Since implant surgery patients are increased every year, researches on implant surgery are actively progressing globally. Success or not of dental implant surgery is affected not only by accurate pre-operative planning but also by ability of surgeon in intra-operative. In this paper, the remote center of motion with double parallelogram linkage is studied. A target point does not move during angular adjustment of the assisted robot for implant surgery by using the remote center of motion mechanism which has double parallelogram structure. The dynamic behaviors of RCM mechanism are observed by visualizing a virtual prototype on the computer screen.
이중평행사변형 구조의 원격중심운동 메커니즘에 관한 연구
정상화(Sanghwa Jeong),김광호(Gwangho Kim),임성빈(Sungbeen Im) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6월
Implant surgery is generally accepted as the good technique to replace the teeth completely. Since implant surgery patients are increased every year, researches on implant surgery are actively progressing globally. Success or not of dental implant surgery is affected not only by accurate pre-operative planning but also by ability of surgeon in intra-operative. In this paper, the remote center of motion with double parallelogram linkage is studied. A target point does not move during angular adjustment of the assisted robot for implant surgery by using the remote center of motion mechanism which has double parallelogram structure. The dynamic behaviors of RCM mechanism are observed by visualizing a virtual prototype on the computer screen.
정상화(Sanghwa Jeong),최석봉(Sukbong Choi),김광호(Gwangho Kim),박준호(Junho Park) 한국생산제조학회 2005 한국공작기계학회 추계학술대회논문집 Vol.2005 No.-
As demands of VBNS and VDSL increase, the development of kernel parts of optical communication such as PLC(Planar Light Circuit), Coupler, and WDM elements increases. The alignment and the attachment technology are very important in the fabrication of optical elements. The ultra precision stage wasn't yet applied in the optical alignment and the optical element alignment was taken too many times. In this paper, the optical element alignment of multi-axis ultra precision stage was studied. The procedure of the alignment algorithms applied to the ultra precision multi-axis stage are developed by LabView programming.