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미세혈관 조영술에 의한 미세혈관 문합후의 혈류재개에 대한 실험적 연구
정필훈,Choung, Pill-Hoon 대한치과의사협회 1985 대한치과의사협회지 Vol.23 No.1
In the assessment of patency of a small vessel anastomosis, micro-arteriography using dental X-ray and film was used as a method of testing the patency of arterial anastomoses in the rat. Micro-arteriography could lead to an objective evaluation of the patency in End-to-End and End-to Side anastomoses. The method used in this study is easily accessible for Oral and Maxillo-facial surgeon to practice the microvascular anastomosis, and requires materials available in every dental clinic.
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Monte Carlo N-Particle Extended Code를 이용한 연 X선 정전기제거장치의 최적제작에 관한 연구(Ⅱ)
정필훈,이동훈 한국안전학회 2017 한국안전학회지 Vol.32 No.6
In order to solve this sort of electrostatic failure in Display and Semiconductor process, Soft X-ray ionizer is mainly used. Soft X-ray Ionizer does not only generate electrical noise and minute particle but also is efficient to remove electrostatic as it has a wide range of ionization. There exist variable factors such as type of tungsten thickness deposited on target, Anode voltage etc., and it takes a lot of time and financial resource to find optimal performance by manufacturing with actual X-ray tube source. Here, MCNPX (Monte Carlo N-Particle Extended) is used for simulation to solve this kind of problem, and optimum efficiency of X-ray generation is anticipated. In this study, X-ray generation efficiency was compared according to target material thickness using MCNPX and actual X-ray tube source under the conditions that tube voltage is 5 keV, 10 keV, 15 keV and the target Material is Tungsten(W). At the result, In Tube voltage 5 keV and distance 100 mm, optimal target thickness is 0.05 ㎛ and fastest decay time appears + decay time 0.28 sec. − deacy time 0.30 sec. In Tube voltage 10keV and distance 100 mm, optimal target Thickness is 0.16 ㎛ and fastest decay time appears + decay time 0.13 sec. − deacy time 0.12 sec. In the tube voltage 15 keV and distance 100 mm, optimal target Thickness is 0.28 ㎛ and fastest decay time appears + decay time 0.04 sec. − deacy time 0.05 sec.
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정필훈,이동근,민병일 대한악안면성형재건외과학회 1981 Maxillofacial Plastic Reconstructive Surgery Vol.3 No.1
Correction of facial imbalance and malocclusion associated with maxillary deformities can be achieved by Le Fort 1 osteotomy. This report of two cases is concerned with surgical correction and soft tissue charges of maxillary protrusion & pseudomandibalar prognathism. The Results are as follows.; 1. Cephalometric analysis, clinical evaluation and model analysis led to a diagnosis of maxillary protrusion in one case & Pseudomandibular prognathism in the other. 2. In the first case, Le Fort 1 osteotomy with aet4ack technique and mid-sagittal sectioning were performed to correct the malocclusion & the severe over-jet. 3. Soft tissue changes of the first case are rolling-in of the vermilion border of the upper lip, reducing upper lip prominence, and increasing the antero-posterior dimension of the nose, 4. In the second case, Le Fort 1 ostertomy with augmentation of paranasal area using proplast were performed to advance the retruded and hypotrophic maxilla. 5. Soft tissue changes of the second case improve upper lip-nose balance by rolling-out of the vermilion border of the upper lip, increasing upper lip prominence, decreasing the antero- posterior dimension of the no and augmentation of paranasal area.
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