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남상현,김범진,고성훈,정윤규,Nam, Sang-Hyun,Kim, Bom-Jin,Koh, Sung-Hoon,Chung, Yoon-Kyu 대한미세수술학회 2006 Archives of reconstructive microsurgery Vol.15 No.1
Twelve cases in eleven patients with segmental bone defects were treated with contralateral fibula free flap and ipsilateral island fibula flap in an antegrade, retrograde or bidirectional flow fashion. Five cases were managed with free flaps and seven were with ipsilateral fibula island transfer. Among seven cases, antegrade fashion was three, retrograde was three, and bidirectional was one. All patients were related with open tibial fractures and its sequelae except one who had open foot bone fracture. According to Gustilo's classification, ten patients were type IIIb and one was type IIIc. Basically, antegrade-flow flaps based on the peroneal vessels as in the conventional free flap were used for the proximal or middle one-third tibial defects. On the contrary, retrograde-flow flaps based on the communicating branch between the peroneal and posterior tibial vessels were used for the middle or distal one-third of the tibia. Bidirection-flow flap based on intact peroneal vessels were used for the middle portion of the tibia. The patients who have undergone ipsilateral fibula island flap had one of the following problems: a previously failed free flap, below-knee amputation of the opposite leg because of open tibial fracture, refusal to use the contralateral sound leg, or poor general condition to stand a lengthy operation. Six of the patients who have got ipsilateral fibula island flap also had an associated fibula fracture on the same leg, which was ultimately used as one of the osteotomy sites. The follow-up period was from 1 to 10 years. Two cases of free flap were failed: one patient had below-knee amputation and the other patient had ipsilateral fibula transfer. Other cases were successful and excellent hypertophy of the transferred fibula was achieved. Time to bone union ranged from 4 to 11 months. Time to full weight bearing was from 5 to 13 months after surgery. All of the transferred fibulas showed hypertrophy after weight bearing. In one case, stress fracture was developed during ambulation, which was healed conservatively. Nonunion occurred in two cases, which were treated with a long leg cast and cancellous bone graft, respectively. Length discrepancy of the legs was noted. The limb was shorter by an average 0.5 cm in three cases, longer by 1.1 cm in one case. In the case of island fibula transfer, limited arc of rotation was not a problem. Other disabling complications were not seen. We believe that these diverse modalities using a vascularized fibula will make us more comfortable to handle major bone defects.
남상현(Sang-Hyun Nam),김남훈(Namhun Kim) 한국정보기술학회 2008 한국정보기술학회논문지 Vol.6 No.4
For mobile cleaning robots, many users desire to clean faster and more efficiently using path planning for complete coverage cleaning. To clean faster and more efficiently, turning operation of a robot must be minimized. In order to make a turning, a robot must repeat in order to stop with deceleration and start with acceleration. Consequently, mobile robot consumes many time because of stop for change of direction and many energy because of acceleration and deceleration. Thus, path planning that has minimal turning according to the shape of cleaning area is required. This papers proposes a cellular decomposition algorithm combined with flow network for creating efficient paths for cleaning area. This algorithm divides the whole cleaning area by the cells, and represents those cells as the flow network and minimizes path among the cells. Then, it creates complete coverage path planning that produces the path best suited to the cells along the shape of the cells by analysing static points for input and output of each cell. We extend the proposed method to replan paths in dynamic environment with moving obstacles.
남상현(Sang-Hyun Nam),임재익(Jae-Ik Lim),김영(Young Kim),김유택(You-Taek Kim),이영호(Young-Ho Lee) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
To solve internal flow characteristics of pump, used the commercial code CFX with tetra mesh from ICEM-CFD, and SST(Shear Stress Transport) of Turbulence model. The result was appeared by performance curves of Head, Shaft horse power and Efficiency. Even though the performance curves of CFD and Exp. a little different, the CFD results was very similar to the experimental internal flow characteristics.
남상현 ( Nam Sang Hyun ),이영오 ( Lee Young Oh ),전에스더 ( Jeon Esther ),김선우 ( Kim Sun Woo ),윤현도 ( Yun Hyun Do ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1
The purpose of this study is to evaluate the Mechanical Property of SHCC on Replacement Level of Expansion Admixture.
변형경화형 시멘트 복합체(SHCC)로 보강된 철근콘크리트 보의 구조성능
남상현 ( Nam Sang Hyun ),장광수 ( Jang Gwang-soo ),이영오 ( Lee Young-oh ),김선우 ( Kim Sun-woo ),윤현도 ( Yun Hyun-do ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.1
The purpose of this study is to evaluate the structural performance of reinforced concrete beams strengthened with SHCC . The parameter of this study is replacement level of fiber.
CFD에 의한 가이드 베인 개도에 따른 튜블러 수차 특성
남상현(Sang-Hyun Nam),김유택(You-Taek Kim),최영도(Young-Do Choi),이영호(Young-Ho Lee) 한국유체기계학회 2007 유체기계 연구개발 발표회 논문집 Vol.- No.-
The world right now is being faced with problems due to fossil fuels such as global warming. There fore, in order to solve such problems, alternative energy is being looked at more deeply. By using a small hydro power generator of which main concept is based on using the different water pressure levels in pipe lines, energy which was initially wasted by use of a reducing valve at the end of the pipeline, is collected by turbine in the hydro power generator. A propeller shaped hydro turbine has been used in order to use this renewable pressure energy. In this study, in order to acquire basic design data of tubular type hydraulic turbine, output power, head, efficiency characteristics due to the guide vane opening angle are examined in detail. Moreover influences of pressure, tangential and axial velocity distributions on turbine performance are investigated by using a commercial CFD code.