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이승환,정문상,백구현,이영호,공현식,이상기,김지영,박종현,Rhee, Seung-Hwan,Chung, Moon-Sang,Baek, Goo-Hyun,Lee, Young-Ho,Gong, Hyun-Sik,Lee, Sang-Ki,Kim, Ji-Yeong,Park, Jong-Hyun 대한미세수술학회 2007 Archives of reconstructive microsurgery Vol.16 No.2
Soft-tissue reconstruction of the foot and ankle has long been a challenge for reconstructive surgeons. Limitations in the available local tissue and donor-site morbidity restrict the options. In an effort to solve these difficult problems, the authors have begun to use a subcutaneous fascial pedicled lateral supramalleolar flap. This report presents the authors' experience with five patients treated with this flap. The patients’ ages ranged from 26 to 72 years; four of the patients were male and one was female. The cause of the soft-tissue defects involved acute trauma and malignant melanom. All flaps survived and provided satisfactory coverage of the defect. Compared with the classic lateral supramalleolar flap, when the perforating branch is interrupted in its course, it is possible to elevate this subcutaneous fascial pedicled flap. The distally based flap with a compound pedicle which is continuous with a vascular axis and a band of subcutaneous fascial pedicle has long pedicle. This procedure is valuable for remote defect of the foot. It is believed that this flap is versatile and effective and is a good addition to the available techniques used by reconstructive surgeons for coverage of the foot and ankle.
이승환(Seung Hwan Lee),신동욱(Dong Wook Shin),이승형(Seung Hyong Rhee) 한국정보과학회 2011 한국정보과학회 학술발표논문집 Vol.38 No.1D
전술환경에서는 jamming과 같은 적의 공격과 노드의 잦은 이동에 의해 링크가 불안정 해질 수 있다. 유선환경을 고려한 상용 OSPF는 이러한 문제점에 대하여 적절하게 대응할 수 없는 단점이 있다. 기존의 OSPF는 jamming 신호가 발생하여 링크가 불안정해도 루트가 재설정되지 않는 단점을 가진다. 그리고 노드의 이동에 따른 control 정보의 전송으로 인해 네트워크의 통신 성능이 저하된다. 본 논문에서는 전술환경을 분석하고 기존의 상용 라우팅 프로토콜인 OSPF의 적용 방안에 대해서 알아보고 문제점을 보완할 수 있는 방안을 제안하였다.
Matti-Russe 술식과 Fisk-Fernandez 술식을 이용한 주상골 불유합 치료에 관한 비교 연구
이승환(Seung Hwan Rhee),정문상(Moon Sang Chung),이영호(Young Ho Lee),공현식(Hyun Sik Gong),김지영(Ji Yeong Kim),김민범(Min Boem Kim),오원석(Won Seok Oh),전숙하(Suk Ha Jeon),김정환(Jeong Hwan Kim),백구현(Goo Hyun Baek) 대한정형외과학회 2008 대한정형외과학회지 Vol.43 No.6
목적: 확정형 주상골 불유합에 대하여 적절한 치료를 시행하지 않는 경우 수근골 불안정 및 골관절염의 진행을 피할 수 없는 것으로 알려져 있다. 본 연구에서는 Matti-Russe 술식과 Fisk-Fernandez 술식을 이용한 골유합술의 임상적 및 방사선학적 결과에 대해 비교, 고찰하고자 한다. 대상 및 방법: 2001년 9월부터 2006년 8월까지 본 병원에서 시행한 주상골 골유합술 증례 중 인터뷰에 응한 21례를 대상으로 하였고 평균 추시기간은 31개월이었다. 임상적 평가로는 관절운동범위, 파악력, 환자만족도, 동통 수준을 설문조사하고, 방사선학적 평가로는 골유합, 무혈성괴사, 골관절염 및 DISI 여부를 평가하였다. 또한, 두 수술군 사이에 결과의 차이가 있는지를 비교하였다. 결과: 두 수술군 사이에 동통이나 만족도의 유의한 차이는 없었다, 관절운동범위, 파악력 모두 건측에 비하여 감소한 소견을 보였으나 역시 두 수술군 사이에는 유의한 차이가 없었다. 두 수술군의 골유합률 및 수술 전후 DISI 교정각 사이에도 유의한 차이는 없었고 술 전 관찰된 DISI는 술 후 모두 교정된 소견을 보였다. 골관절염의 경우 전체적으로 7예에서 관찰되었는데, 그 중 술 전에 없던 골관절염이 새롭게 나타난 경우가 1예 있었다. 결론: 두 수술군 사이에 임상적, 방사선학적 평가에 있어서 통계적으로 유의한 차이를 보이지 않으며, 두 술식 모두 골유합과 기능적 회복에 있어서 효과적인 방법이다. Purpose: Established scaphoid nonunion may lead to carpal instability and osteoarthritis. The purpose of this study is to compare the clinical and radiological results of the osteosynthesis between Matti-Russe group and Fisk-Fernandez group. Materials and Methods: Our retrospective study included 21 nonunion cases in 20 patients treated by Matti-Russe or Fisk-Fernandez technique from September 2001 to August 2006. The mean duration of follow up was 31 months. Based on the questionnaire which included clinical information and the radiologic evaluation, we compared the objective and subjective results between two surgical groups. Results: There were no significant differences between two groups in respect of the postoperative satisfaction and the pain. Both the range of motion and the grip power decreased compared to that of the unaffected side, but there were no significant differences between two groups. Also, there were no significant differences in the union rate and the rate of successful correction of DISI deformity. In all cases in which DISI deformity was detected preoperatively, the deformity was corrected postoperatively. There were 7 cases of osteoarthritis, but among them only one case appeared newly after the surgery. Conclusion: There were no significant differences between two surgical groups in clinical and radiological results. Both techniques were effective in achieving bony union and functional recovery.
이승환 ( Seung Hwan Lee ),김태성 ( Tae Sung Kim ),박봉진 ( Bong Jin Park ),이봉암 ( Bong Arm Rhee ),임영진 ( Young Jin Lim ) 대한뇌종양학회·대한신경종양학회·대한소아뇌종양학회 2006 대한뇌종양학회지 Vol.5 No.1
Spontaneous regression of intracranial tumor is rare and especially in case of intratumoral bleeding, it is hardly found in documented report. We experienced 34 year-old male patient with metastatic brain tumor from maxillary malignant melanoma which is turned into tumor bleeding, underwent rapid resolution of tumor bleeding. We report the clinical manifestation, radiological characteristics and histological aspect of this rare case with literature review.
공용 주파수 대역에서 IEEE 802.11과의 공존을 위한 IEEE 802.16 MAC 프로토콜
이승환 ( Seung-hwan Lee ),이승형 ( Seunghyong Rhee ) 한국정보처리학회 2009 한국정보처리학회 학술대회논문집 Vol.16 No.1
본 논문에서는 공용 주파수 대역에서 IEEE 802.11 WLAN과 IEEE 802.16 WMAN과의 효율적인 공존을 위한 MAC 프로토콜을 제안한다. 제안한 프로토콜은 IEEE 802.11 WLAN과 IEEE 802.16 WMAN이 주파수를 공유하며 지리적으로 공존하는 환경을 가정하였다. IEEE 802.16 WMAN의 BS(Base station)와 SS(Subscriber station)의 통신에서 DL(Down Link)구간에서는 SS가 자신의 DL-burst에서 IEEE 802.11의 CTS를 보내 주변의 IEEE 802.11 디바이스들의 통신을 지연시킴으로써 IEEE 802.11 WLAN 및 IEEE 802.16 WMAN이 공존하면서도 충돌을 방지해 전송 효율을 높일 수 있다. 본 논문에서 제안하는 MAC 프로토콜의 동작에 대해 설명하고 시뮬레이션을 통해 기존 방법보다 향상된 성능을 유지함을 보인다.
이혁진,이영호,공현식,이승환,이준오,노영학,김강욱,백구현,Lee, Hyuk-Jin,Lee, Young-Ho,Gong, Hyun-Sik,Rhee, Seung-Hwan,Lee, Joon-Oh,Roh, Young-Hak,Kim, Kang-Wook,Baek, Goo-Hyun 대한미세수술학회 2010 Archives of reconstructive microsurgery Vol.19 No.1
Schwannoma of the brachial plexus region is very rare. There has not been general agreement in terms of surgical outcome from limited number of studies. We analyzed surgical outcomes from 11 cases of schwannomas which occurred in the brachial plexus. From February 2000 to August 2009, 11 patients with schwannomas of the brachial plexus region were surgically treated by a single surgeon. We retrospectively reviewed the medical records and MRI of our cases, and evaluated the neurologic deficit and the recurrence of tumors after surgery. All the cases were proven histologically as schwannomas. The mean age of the patients was 52.6(36~67) years old, 4 of them were male and 7 were female. The tumor was located in the left side in 9 patients, and right in 2. The mean postoperative follow-up was 24.7(6~78) months. Initial presentation was usually painless, palpable mass. The mass was located in various level of the brachial plexus such as root, trunk, cord, or terminal branch level. The size of mass was from $1.5{\times}1.5{\times}0.5$ cm to $11.0{\times}10.0{\times}6.0$ cm. Eight of 11 patients showed no neurologic deficit. Three patients showed postoperative neurologic deficit; two of them had transient sensory deficit, and one of them had weakness of flexor pollicis longus and 2nd flexor digitorum profundus. There were no recurrences. The schwannoma of the brachial plexus region should be considered as a curable lesion with an acceptable surgical risk of injury to neurovascular structures. With precise surgical techniques, these tumors can be removed to improve patient's symptoms with minimal morbidity.
다발성 Kirschner 강선을 이용한 제 5중족골 기저부 골절의 수술적 치료
김지형,김장우,이정익,김상길,이승환,Kim, Jihyeung,Kim, Jang Woo,Lee, Jeong Ik,Kim, Sang Kil,Rhee, Seung Hwan 대한족부족관절학회 2014 대한족부족관절학회지 Vol.18 No.1
Purpose: The purpose of this study is to evaluate the clinical and radiographic results of internal fixation using multiple Kirschner wires (K-wires) for the fifth metatarsal base fracture. Materials and Methods: We retrospectively reviewed 14 patients with a displaced fifth metatarsal base fracture. We measured the distance of fracture displacement on the foot oblique radiograph pre- and post-operatively. We evaluated the clinical results using the visual analog pain scale at six weeks and three months postoperatively and the American Orthopaedic Foot and Ankle Society (AOFAS) mid-foot score at six months postoperatively. Results: In our series, 10 cases were zone I fracture and four cases were zone II fracture. We achieved anatomical reduction and bony union in all of our cases. The average time to bone union was 43 days. The degree of pain around the fifth metatarsal base was significantly decreased after surgery. The average AOFAS score was 95 at six months postoperatively. Conclusion: Multiple K-wire fixation is a relatively simple fixation method for displaced fifth metatarsal base fractures. If we place a K-wire into the medial cortex of the fifth metatarsal, we could prevent proximal migration of the K-wire.