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서유성,김동진,박종석,임수재,나수균,최창욱 순천향의학연구소 1998 Journal of Soonchunhyang Medical Science Vol.4 No.2
Dislocation is one of the serious complications in total hip replacement arthroplasties. The purpose of this study is to evaluate the risk factors of dislocation, including age, sex, preoperative diagnosis and bilaterality, history of previous hip surgery, positioning of component, soft tissue tension, treatment after dislocation or redislocation. Authors reviewed 190 patients of total hip replacement arthroplasty, which were performed from Jan. 1990 to Dec. 1996. 15 cases developed dislocation after surgery. Incidence of dislocation was 7.89%(15 of 190 cases). Dislocation after revision was not happened(0 of 18 cases). Inclination of acetabular cup was average 37.5° (range: 31° - 43° ). Average anteversion of the acetabular component was 18.1" by Woo and Morrey method, 11.4° by Hassan method. They were normal range except 3 cases. Dislocation was not prevented even though inclination and anteversion of acetabular cup were within normal range. Soft tissue tension is determined by change of limb and femoral neck length. Average limb length difference was -0.2mm(range; -l0mm - +10mm) and average offset difference was +1.7mm(range;-4mm - +18mm). Revision must be accomplished as soon as possible when limb shortening happen by upward migration of the acetabular component. In conclusion, anteversion of acetabular cup may be most important factor in our cases, so cup position must be fixed in proper position during operation.
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서유성,박형근,최형석,김연일,이병일 순천향의학연구소 2002 Journal of Soonchunhyang Medical Science Vol.8 No.2
In case of the occurrence of osteonecrosis at three or more anatomical location, it is defined as multifocal osteonecrosis, but still any king of study with references hasn't been reported in Korea. The patient who had admitted due to the pain in both knee joints, both hip joints and left ankle joint and we diagnosed as multifocal osteonecrosis by using bone scan and magnetic resonance imaging. To relieve right knee joint and left hip joint pain, we perfomed arthroplasty. Here we present one case report of multifocal osteonecrosis through analysis by patient's history and hematologic examination and provide a review of the literature.
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서유성(You Sung Suh),임석범(Suk Bum Lim),최형석(Hyung Suk Choi),김연일(Yon Il Kim),나수균(Soo Kyoon Rah),이병일(Byung Ill Lee) 대한골절학회 2001 대한골절학회지 Vol.14 No.2
Purpose: This study was performed to analyze the weight-bearing ambulation time, bony union time and complications after fixation of comminuted subtrochanteric fractures of the femur with compression hip screw and evaluate its effectiveness. Material k Methods: From January 1993 to January 2000, 21 cases of Seinsheimer's Type IV and Type V comminuted subtrochanteric fractures of femur which were treated by compression hip screw and followed for more than 1 year were analyzed by weight-bearing ambulation time, bony union time and complications. Results: We recommended partial weight bearing ambulation from 6 weeks after operation and full weight bearing ambulation from 12 weeks after operation. All of 21 cases, primary bony union was achieved and mean time was 16 weeks(range 13 to 25 weeks). 2 cases of mechanical complications were occurred. Also 4 cases of malunion of lesser trochanter and 2 cases of nonunion of lesser trochanter were occurred, but none of them result in limitation of motion, limping nor pain. Conclusions: We thought compression hip screw is a good implant for rigid fixation of comminuted subtrochanteric fractures, especially involve intertrochanteric region like Seinsheimer's Type IV and Type V.
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n-CdS_(0.46)Se_(0.54)/p-Cu_92-x)S_(0.46)Se_(0.54) 이종접합 태양전지의 제작과 그 특성에 관한 연구
유상하,최승평,이상열,홍광준,서상석,김혜숙,전승룡,윤은희,문종대,신영진,정태수,신현길,김택성,유기수 全北大學校 基礎科學硏究所 1994 基礎科學 Vol.16 No.-
승화방법에 의해 CdS_0.46Se_0.54 단결정을 성장하여 결정구조를 조사하고, Van der Pauw 방법으로 Hall effect를 측정하여 carrier density의 온도 의존성과 mobility의 온도 의존성을 조사하였다. 성장된 CdS_0.46Se_0.54 단결정을 치환반응하여 n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 이종접합 태양전지를 제작하였다. Spectral response, 전류-전압특성 및 전력변환 효율을 조사하여 그 결과로부터 개방전압은 0.48V, 단락 전류 밀도는 21mA/㎠, fill factor와 전력변환효율은 각각 0.75와 9.5%를 얻었다. CdS_0.46Se_0.54 single crystal was grown by a sublimation method. The crystal structure and the temperature dependence of carrier density and mobility of CdS_0.46Se_0.54 single crystal were studied. Heterojunction solar cells on n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 were fabricated by the substitution reaction. The spectral response, the J-U characteristics and the conversion efficiency of the n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 heterojunction solar cells were studied. The open-cricuit voltage, short-circuit density, fill factor and conversion efficiency of n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 heterojunction solar cells under 80mW/㎠ illumination were found to be 0.48V, 21mA/㎠, 0.75 and 9.5%, respectively.
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C.V.D. 방법에 의한 Cd_0.78Zn_0.22 S박막 성장과 광전기적 특성연구
유상하,이상렬,홍광준,서상석,김혜숙,전승룡,윤은희,문종대 조선대학교 기초과학연구소 1993 自然科學硏究 Vol.16 No.1
We had grown Cd_0.78Zn_0.22S polycrystal thin films on slide substrate using chemical vapour deposition(CVD) method. We measured X-ray diffraction patterns in order to study Cd_0.78Zn_0.22S polycrystal structure. We studied its band gap using transmission curves and photocurrent and also analyzed photoluminescence using configurational coordinate model. We measured Hall effect·on this sample by Van der Pauw method and studied on carrier density and mobility depending on temperature.
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유병욱,서영석 고려대학교 의과대학 1985 고려대 의대 잡지 Vol.22 No.1
The present study is an analysis of dorsal root ganglion cells and their axons in both dorsal roots and peripheral nerves of L_(6) and S₁ segments in normal and capsaicin-pretreated adult rats. Capsaicin was injected subcutaneously on 2nd day of life. All rats were operated microsurgically to remove somatic and visceral motor nerve fibers from peripheral nerves, and fixed by transcardiac perfusion technique. The dorsal root ganglia were embedded in paraffin, cut serially, and all ganglion cells were counted by light microscopy. The dorsal roots and peripheral nerves were embedded in plastic mixture, and all myelinated and unmyelinated axons were counted by electron microscopy. The results obtained were summarized as followings. 1. In normal rats, the ganglion cell numbers were revealed wide individual differences in L_(6) and S₁ dorsal root ganglia, but not so wide, only less than 20%, when put together. 2. In capsaicin rats, the perished cells in dorsal root ganglia were 46% in average, and most of them were appeared to be small B cells. 3. In capsaicin rats, the decrease rates of axons in dorsal roots and peripheral nerves were almost same in L_(6) or S₁ segment, and the average decrease rate was 10% in myelinated axons, 58% in unmyelinated axons and 44% as a whole. 4. In normal rats, the branching rates were about same in doral root and periphera1 nerve in one segment, but not in different segments. The average rate (1.59) in L_(6) was lower than that (1.76) in S₁. 5. In capsaicin rats, the branching rates of preserved axons (1.67 in L_(6) and 1.87 in S₁) w x e higher than those in normal rats, and those of perished axons(1.49 in L_(6) and 1.63 in S₁) were lower than those in normal rats. 6. Thus, it is manifested that the neonatal capsaicin treatment causes the marked depletions of small B cells in dorsal root ganglia and of unmyelinated axons in dorsal roots and peripheral, i.e., the small ganglion cells give rise to the fine sensorry axons in dorsal roots and peripheral nerves. And, it is suggested that the branching rate of the fine unmyelinated axons is lower than that of large myelinated axons.
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( You Sung Suh ),( Jae Hwi Nho ),( Seong Min Kim ),( Sijohn Hong ),( Hyung Suk Choi ),( Jong Seok Park ) 대한고관절학회 2015 Hip and Pelvis Vol.27 No.1
Purpose: In comminuted intertrochanteric fractures, various operative options have been introduced. The purpose of this study was to determine whether there were differences in clinical and radiologic outcomes among bipolar hemiarthroplasty (BH), compression hip screw (CHS) and proximal femur nail antirotation (PFNA) in treating comminuted intertrochanteric fractures (AO/OTA classification, A2 [22, 23]) Materials and Methods: We retrospectively evaluated total 150 patients (BH, 50; CHS, 50; PFNA, 50) who were operated due to intertrochanteric fractures from March 2010 to December 2012 and were older than 65 years at the time of surgery. We compared these three groups for radiologic and clinical outcomes at 12 months postoperatively, including Harris Hip Score, mobility (Koval stage), visual analogue scale and radiologic limb length discrepancy (shortening). Results: There was no statistical significance among three groups in clinical outcomes including Harris Hip Score, mobility (Koval stage), visual analogue scale. However, there was significant differences in radiologic limb discrepancy in plain radiographs at 12 months postoperatively (radiologic shortening: BH, 2.3 mm; CHS, 5.1 mm; PFNA, 3.0 mm; P=0.000). Conclusion: There were no clinical differences among BH, PFNA, and CHS in this study. However, notable limb length shortening could be originated during fracture healing in osteosynthesis, compared to arthroplasty (BH<PFNA<CHS).
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