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정윤교(Yoon-Gyo Jung),정혜라(Hye Ra Jung),김일만(Ealmaan Kim) 대한두개저학회 2013 대한두개저학회지 Vol.8 No.2
Osteomas mainly affect the frontal and ethmoid sinuses, and are usually asymptomatic. When enlarged, they can give rise to intracranial manifestations and life-threatening complications. A 41-year-old man presented with severe headache and drowsy mentality after blowing his nose. Computed tomography showed air bubbles in the cisterns and the ventricle and around the osteoma in the frontal sinus, suggesting that the mass was associated with entry of the air into the cranial cavity. Through a frontal sinusotomy, the cauliflower-like osteoma was found to be protruding intracranially through the frontal base and the overlying meninges. By using skull base technique, the osteoma was resected radically and the dural defect was repaired with autografts. This rare condition should be urgently treated in the event of acute deterioration. The literature will be reviewed regarding the management of cranial base osteomas and their complications.
롤러 가압 임프린트 공정에서 잔류막 두께 예측에 관한 연구
조영태(Young Tae Cho),정윤교(Yoon-Gyo Jung) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.1
In order to apply nano imprint technology in large area process, roller pressing is promising because of its low cost and high productivity. When pressing mold by roller, liquid resin is locally squeezed between mold and substrate. In this study, the main focus is to understand which process parameter affects residual layer. To do this, a simple analytical model was introduced. Especially, we consider the aspect ratio of patterns as essential cause of variation of the thickness in the equation. As a result, when the aspect ratio of pattern in the mold increases, the thickness of residual layer also increases. In conclusion, we show that the uniformity of residual layer could be accomplished by the control of velocity and pressing force in roller pressing imprint process.
롤러 가압 임프린트 공정에서 잔류막에 미치는 공정 변수의 영향
조영태(Youngtae Cho),정윤교(Yoon-Gyo Jung) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.5-3
In order to apply the nano imprint technology in the large area process, roller pressing is promising because of low cost and high productivity. When pressing mold by roller, liquid resin is locally squeezed by mold and substrate. In this study, the main focus is to understand which process parameter affects the residual layer. To do this, simple analytic model was introduced. Especially, we insert aspect ratio term in the equation. As a result, when the aspect ratio of pattern in the mold increases, the thickness of residual layer also increases. For the conclusion, the uniformity of residual layer could be accomplished by the control of velocity and pressing force in roller pressing imprint process.
김상명(Sang-Myng Kim),정윤교(Yoon-Gyo Jung),조성림(Sung-Leem Cho) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.3
Recently, the deburring process which is last process of manufacture is one of the important process for complete product. The manual deburring process can cause not only higher error rate but also irregular shape and quality of product. Therefore, Shape Guided Automatic Deburring Machine has been developed to resolve the above problems. But the Shape Guided Automatic Deburring Machine have been applied only to produce a circular product. Therefore, this machine is difficult to apply to products of various shapes. To solve this problem, we would like to develop Generalized Shape Guided Automatic Deburring Machine applicable to various shapes. To this end, we have done the modeling and design using CATIA program and have performed machine simulation.
MC-Space 알고리즘을 이용한 역공학 효율성 증대에 관한 연구
황종대(Jong-Dae Hwang),정윤교(Yoon-Gyo Jung),정종윤(Jong-Yoon Jung) 한국생산제조학회 2005 한국공작기계학회 추계학술대회논문집 Vol.2005 No.-
This study deals with the improvement of efficiency in the aspect of accuracy and time reduction in the reverse engineering. For this, two main strategies are applied in this paper. One is the path smoothness strategy, the other is the collision free strategy. Path smoothness strategy adopts modified B-spline algorithm that is constructed with altered control vertices. It allows improvement of accuracy of reverse engineering with faired surface. Collision free strategy adopts configuration space algorithm defined by two parameters which determine the probe posture. It allows a time reduction of reverse engineering without collision. So this two strategies are named, MC-Space algorithm.