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콘빔형 전산화단층영상을 이용한 치과임플란트 식립유도장치 개발
최형수,김규태,최용석,황의환,Choi, Hyung-Soo,Kim, Gyu-Tae,Choi, Yong-Suk,Hwang, Eui-Hwan 대한영상치의학회 2010 Imaging Science in Dentistry Vol.40 No.4
Purpose : The purpose of this study is to develop a surgical stent for dental implant procedure that can be easily applied and affordable by using cone beam computerized tomography (CBCT). Materials and Methods : Aluminum, Teflon-PFA (perfluoroalkoxy), and acetal (polyoxymethylene plastic) were selected as materials for the surgical stent. Among these three materials, the appropriate material was chosen using the CBCT images. The surgical stent, which could be easily placed into an oral cavity, was designed with chosen material. CBCT images of the new surgical stent on mandible were obtained using Alphard-3030 dental CT system (Asahi Roentgen Co., Ltd., Kyoto, Japan). The point of insertion was prescribed on the surgical stent with the multiplanar reconstruction software of OnDemand3D (CyberMed Inc., Seoul, Korea). Guide holes were made at the point of insertion on the surgical stent using newly designed guide jig. CBCT scans was taken for the second time to verify the accuracy of the newly designed surgical stent. Results : Teflon-PFA showed radiologically excellent image characteristics for the surgical stent. High accuracy and reproducibility of implantation were confirmed with the surgical stent. Conclusion : The newly designed surgical stent can lead to the accurate implantation and achieve the clinically predictable result.
이승열(Syeung-Youl Lee),최형수(Hyung-Soo Choi),맹주철(Joo-Cheol Maeng),전일식(Il-Sik Jeon),권순정(Soon-Jung Kwon) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.5
고속철도구간에서 설빙 또는 자갈비산에 의해 레일두부의 표면에 흠집이 발생하게 된다. 레일 표면에 발생하는 흠집은 차륜의 주행에 영향을 주며 궤도의 부담력이 증대되어 레일에 피로를 유발하게 되며 레일하부 지지층을 이루고 있는 침목, 도상 등에도 악영향을 줄 수 있다. 따라서 본 연구에서는 기존연구문헌을 통해 레일표면 흠집 발생으로 유발되는 궤도부담력을 분석하고 실제 현장에서 윤중, 침목수직변위 등의 측정을 통해 궤도에 발생되는 부담력을 측정 분석하였다. 측정결과에 따르면 레일 흠집의 깊이와 종방향 길이, 차량의 속도가 주요 영향요인임을 확인할 수 있었다. In HSR(High Speed Railway), surface of rail head scratched by snow and scattering gravel. Scratches that occur on the surface of the rail head, affect driving wheel and increased wheel load, it caused rail fatigue and affects tie and ballast. So, in this study analyzed occurring wheel load on track by rail surface scratch through the existing study and measured wheel load and vertical displacement of tie. According to the result of measurement, depth and longitudinal length of the scratches, driving speed of the vehicle are significant factor of increasing wheel load.
고정크로싱 분기기 증속시험을 통한 차량의 주행안전성 평가
권세곤(Se-gon Kwon),모충선(Choong-Sun Mo),최형수(Hyung-soo Choi),박성백(Sung-back Park),손의식(Eui-sik Son),박용주(Yong-ju Park) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
현재 분기기 직선측 최대 통과속도 제한기준은 일본의 협궤사용에 따른 주행안전성 확보를 위한 기준을 준용한 것으로 표준궤를 사용하는 국내의 분기기 최대 통과속도 산정기준은 없는 실정이며, 국내에 부설된 고정크로싱 분기기의 경우 설계속도 180km/h로 제작됨에 따라 일반철도에 부설된 분기기 최대 통과속도와 40km/h 차이를 가지고 있어 열차운행 측면에서 속도향상이 지속적으로 요구되고 있다. 따라서 고정크로싱 분기기 직선측 최대 통과속도 현실화를 위해 단계별 증속시험을 통한 현차주행 성능시험을 시행하여 분기기 종류별, 열차종별, 속도대별 차량 주행안전기준 만족여부를 검증하였다. The current general turnout passing speed limit regulations on straight sections is based on the standard for securing running stability Japan where a narrow gauge is being used. However, in Korea there is no appropriate turnout passing speed calculation standard as a standard gauge is being used. In addition, all rigid crossing turnouts have been manufactured with the design speed of 180km/h, 40km/h lower than the passing speed limit of the turnouts laid on general railways. Therefore, it is consistently requested to improve the speed with a view to stable train operations. As a result, we carried out the road running performance test through staged speed-up tests in an attempt to exceed the speed limit on the straight sections of the rigid crossing turnout to validate if all the rolling stock running safety requirements were met regardless of turnout type, train type, or speed range.