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하악지시상분할절단술에 의한 하악전돌증 수술후 상순의 변화에 관한 연구
우순섭,위현철,이영수,심광섭,Woo, Soon-Seop,We, Hyun-Chul,Lee, Young-Soo,Shim, Kwang-Sup 대한악안면성형재건외과학회 1999 Maxillofacial Plastic Reconstructive Surgery Vol.21 No.1
Recently, sagittal split ramus oseotomy and intraoral vertical ramus osteotomy have been commonly performed for the correction of mandibular prognathism, occurred to abundant oriental people. Many authors have studied the soft tissue change after orthognathic surgery, especially between mandibular hard tissues and soft tissue of lower lip, but the study of upper lip change is comparatively little. Therefore, we studied the 12 patients, operated only sagittal split ramus osteotomy without genioplasty or maxillary osteotomy in department of oral and maxillofacial surgery, Hanyang university hospital from 1996. 1. 1. to 1998. 7. 20. Preoperative and postoperative cephalometric view was measured to know the change of upper lip position and shape after mandibular setback. The result were obtained as follows. 1. The ratio of upper lip change amount to lower incisor horizontal movement was 15.1%. 2. The ratio of lower facial profile between Sn-Stm and Stm-Mes was changed from 1 : 2.352 to 1 : 2.069 after operation. 3. Post-operative upper lip was flattened 72.4% compared with pre-operative one. 4. The vermilion zone of the upper lip increased 56 % horizontally, 5.8% vertically after operation. 5. The vermilion zone ratio of the lower lip to the upper lip was changed from 1 : 1.253 to 1 : 1.348. 6. The distance between esthetic line and Ls was changed from -3.958mm to -1.15mm.
Forchheimer 포화항력모델을 이용한 투수성 호안의 해수교환량 모의
최지웅 ( Ji-woong Choi ),위현철 ( Hyun-chul Wi ),김대근 ( Dae-geun Kim ) 조선대학교 공학기술연구원 2021 공학기술논문지 Vol.14 No.3
In this study, FLOW-3D's Forchheimer's saturation drag model was used to physically reproduce the flow of infiltrating water in the body of the permeable seawall. This study confirmed that Forchheimer's saturation drag model could be applied to the permeability evaluation of the sea wall. The flow patterns in the body were compared between the temporary seawall constructed using only rubble stones and the back reinforced seawall in which the back part of the seawall was reinforced with filter rocks and mats. The flow patterns in the temporary seawall body were well-reproduced, in which the infiltration water moves from the open sea to the inside, and the flow accelerates as the stream tube shrinks. In the back-reinforced seawall, the flow pattern in which the seepage line of the body rises compared to the temporary seawall is well-reproduced due to the low permeability of the filter mat. When the simulated results of the inland tide surrounded by the seawall were compared with the observation data, the simulated and observed values showed a slight difference within 0.3m. At the T5 point, seawater exchange through the seawall was relatively as large as the temporary seawall installed. The simulation results reproduced the phenomenon that the tidal wave occurred smaller than the T5 point because the seawater exchange rate through the seawall was relatively low at the T6 point. After all, the back-reinforced seawall was smaller. In addition, it reproduced the observation data in which the tide was delayed, and the duration of the ebb tide was superior to that of the flood tide.