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한국형 고속철도 차량의 운행조건에 따른 차내 소음 분석
최성훈(Choi Sunghoon),김재철(Kim Jae-Chul),이찬우(Lee Chan-Woo),문경호(Moon Kyung-Ho) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
The conditions for measurement of the interior noise should meet the international standards. However, due to the limitations in test conditions the possible errors in measurement equipment, reliability of the measurement results has been questioned. Hence, the test procedure for the interior noise measurement of KTX vehicles are reviewed and investigated with the reference of international standards. Furthermore, the acceptable tolerance is inspected through the analysis of the factors that influence the interior noise of the KTX vehicle.
식도 재건 수술에 있어 유문 성형과 식도 접합 경로에 따른 음식물 역류 현상 연구
최성훈(Sunghoon Choi),성재용(Jaeyong Sung),이재익(Jae-Ik Lee) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.7
본 연구에서는 식도 재건 수실 시 유문 성형 여부와 위장 이식편을 이용한 식도 접합 경로에 따른 음식물 역류 현상에 대해 고찰하였다. 위장 이식편의 두 가지 접합 경로(전방, 후방)는 환자10 명의 CT 영상으로부터 얻어졌으며, 식도관 모델은 RP 로 제작하였다. 식도관은 유문 성형 여부의 두가지 유문 모델에 연결하였고, 다양한 압력과 펄스폭을 적용하여 역류되는 유체의 체적과 최대 역류높이를 측정하였다. 그 결과, 역류 체적과 높이는 압력에 따라 증가하였으며, 유문 성형을 하면 전방경로가 후방 경로보다 역류되는 체적과 높이 작게 나타났다. 역류량은 펄스폭이 증가하면 증가하나 최대 역류높이에 대한 영향은 유문 성형 여부에 따라 달라진다. In this study, duodenogastric reflux has been investigated according to pyloroplasty and the path of the gastric tube in esophageal reconstruction. The paths of the gastric graft (front and rear paths) were determined from the CT images of ten patients, and the gastric tube model was constructed using an RP technique. The gastric tubes were connected to the pylorus models with and without pyloroplasty. Various distal pressures and pulse widths were applied, and the volume and maximum height of the refluxate were measured. The results show that the volume and height of the refluxate increase with the distal pressure, and the front path leads to a smaller volume and lesser height of the refluxate than the rear path if pyloroplasty is conduced. The volume of the refluxate is markedly increased by a larger pulse width, but its effect on the maximum height depends on whether pyloroplasty is conducted.
최성훈(Choi Sunghoon),은종필(Eun Jong-Pil),강동훈(Kang Donghoon) 한국철도학회 2009 한국철도학회 세미나자료 Vol.2009 No.5
Measurement of dynamic characteristics are widely used to detect defects in mechanical or civil structures. The most common approach is to measure changes in frequency spectrum or mode shapes using accelerometers. An alternative to using mode shapes is using stain modes. Strain is more sensitive to local defects than displacement, and hence stain modes measurement is an efficient in structural health monitoring. This paper deals with dynamic monitoring of a beam structure using strain sensors. Resistive strain gages and FBG strain gages are used and their characteristics are compared. It has been known that resistive strain gages are week to EMI environment and suffers from noise at high frequency range. It has been shown that the FBG sensor is a good alternative that overcomes such difficulties.