고속 구동용 단상 FRM(Flux-Reversal Machine)의 제어 특성에 관한 연구

장재완(Jae-Wan Jang),김명진(Myung-Jin Kim),장기봉(Ki-Bong Jang),소종석(Jong-Suk Soh),이주(Ju Lee) 대한전기학회 2004 대한전기학회 학술대회 논문집 Vol.2004 No.7

시스템 및 네트워크 모니터링 도구를 이용한 리눅스 서버의 보안성 강화

정성재(Sung-Jae Jung),현상완(Sang-Wan Hyoun),소우영(Woo-Young Soh),송정길(Jung-Gil Song) 한국멀티미디어학회 2004 한국멀티미디어학회 학술발표논문집 Vol.2004 No.1

요추부 척추관 협착증과 동반된 경막내 신경초종: 증례 보고

소재완,김태헌,권세원,Soh, Jae-Wan,Kim, Tae-Heon,Kwon, Sai-Won 대한근골격종양학회 2011 대한골관절종양학회지 Vol.17 No.2

요추부 척추관 협착증과 경막내 종양이 동반되어 있는 환자에서, 척추관 협착증에 대한 수술적 치료만 시행하였다가 수술 후 증상이 잔존할 수 있다. 본 증례는 척추 신경이 척추관 협착증으로 인한 외적인 압박과 함께, 종양의 공간 점유로 경막내 압박을 동반하였던 경우로, 신경 감압술과 경막내 종양의 제거를 동시에 시행하여 성공적으로 치료되었기에 문헌 고찰과 함께 보고하는 바이다. 71세 여자환자가 하부 요통 및 양측 하지로의 방사통을 주소로 내원하였다. 자기 공명 영상에서 제 4-5 요추부는 척추관 협착증 소견과 함께 제 5 요추-제 1 천추부에 경도의 척추 전방 전위증 소견이 관찰되었고, 제 4 요추체 부위에서 타원형의 경막내 공간의 대부분을 점유하는 종괴가 관찰되었다. 후방 도달법으로 감압술 및 유합술을 시행한 다음, 정중 경막 절개술을 통해 종괴를 제거하였다. 조직 검사상 신경초종으로 진단되었고, 수술 후 증상은 현저히 호전되었다. In the patient who has intradural mass associated with spinal stenosis, if the operation for spinal stenosis is performed alone, the symptom may remain. We report with literature review that we achieved the successful outcome after simultaneous decompression of spinal stenosis and space occupying mass removal in the case of intradural and extradural compression. A 71-year-old female patient suffering from low back pain and radiating pain of both lower extremities admitted. In magnetic resonance imaging, spinal stenosis on L4-5 and spondylolisthesis on L5-S1 compressed dural sac and intradural space occupying mass on L4 level compressed. By posterior approach, decompression and interbody fusion were carried out. Then mass was removed with median durotomy. Pathologic diagnosis was schwannoma and the symptom was improved remarkably.

Pt-Catalyzed Growth of Amorphous SiOx Nanowires

Hyoun Woo Kim,Ik-Mo Lee,Jae-Won Soh,Jong Woo Lee,Keun Hyeung Lee,Mi Kyoung Park,Sang-Eon Park,Seung Hyun Shim,Wan In Lee 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I

We have fabricated SiO$_x$ nanowires on a large scale through a Pt-catalyzed process. The scanning electron microscopy (SEM) investigation revealed that the nanowires had diameters in the range of 30 $\sim$ 130 nm. X-ray diffraction (XRD), selected area electron diffraction (SAED), and energy-dispersive X-ray (EDX) analyses indicated that the nanowires were amorphous and consisted only of Si and O elements. The growth of the SiO$_x$ nanowires was most likely controlled by the base-growth mechanism with the assistance of the underlying Pt layer. The room-temperature PL spectrum measurement showed a broad emission band, peaking around 3.0 eV. This simple heating method, with the effectiveness of the Pt catalyst, can be applied to a wide range of substrate materials, which may contribute to producing various useful nanostructures.

Risk factor analysis for predicting vertebral body re-collapse after posterior instrumented fusion in thoracolumbar burst fracture

Jang, Hae-Dong,Bang, Chungwon,Lee, Jae Chul,Soh, Jae-Wan,Choi, Sung-Woo,Cho, Hyeung-Kyu,Shin, Byung-Joon Elsevier 2018 SPINE JOURNAL Vol.18 No.2

<P><B>Abstract</B></P> <P><B>Background Context</B></P> <P>In the posterior instrumented fusion surgery for thoracolumbar (T-L) burst fracture, early postoperative re-collapse of well-reduced vertebral body fracture could induce critical complications such as correction loss, posttraumatic kyphosis, and metal failure, often leading to revision surgery. Furthermore, re-collapse is quite difficult to predict because of the variety of risk factors, and no widely accepted accurate prediction systems exist. Although load-sharing classification has been known to help to decide the need for additional anterior column support, this radiographic scoring system has several critical limitations.</P> <P><B>Purpose</B></P> <P>(1) To evaluate risk factors and predictors for postoperative re-collapse in T-L burst fractures. (2) Through the decision-making model, we aimed to predict re-collapse and prevent unnecessary additional anterior spinal surgery.</P> <P><B>Study Design</B></P> <P>Retrospective comparative study.</P> <P><B>Patient Sample</B></P> <P>Two-hundred and eight (104 men and 104 women) consecutive patients with T-L burst fracture who underwent posterior instrumented fusion were reviewed retrospectively. Burst fractures caused by high-energy trauma (fall from a height and motor vehicle accident) with a minimum 1-year follow-up were included. The average age at the time of surgery was 45.9 years (range, 15–79). With respect to the involved spinal level, 95 cases (45.6%) involved L1, 51 involved T12, 54 involved L2, and 8 involved T11. Mean fixation segments were 3.5 (range, 2–5). Pedicle screw instrumentation including fractured vertebra had been performed in 129 patients (62.3%).</P> <P><B>Outcome Measures</B></P> <P>Clinical data using self-report measures (visual analog scale score), radiographic measurements (plain radiograph, computed tomography, and magnetic resonance image), and functional measures using the Oswestry Disability Index were evaluated.</P> <P><B>Methods</B></P> <P>Body height loss of fractured vertebra, body wedge angle, and Cobb angle were measured in serial plain radiographs. We assigned patients to the re-collapse group if their body height loss progressed greater than 20% at any follow-up time compared with immediate postoperative body height loss; we assigned the remaining patients to the well-maintained group. The chi-square test and <I>t</I> test of SPSS were used for comparison of differences between two groups and multiple logistic regression analysis for risk factor evaluation. Through the decision tree analysis of statistical package R, a decision-making model was composed, and a cutoff value of revealed risk factors and re-collapse rate of each subgroup were identified. The present study wassupported by the University College of Medicine Research Fund (university to which authors belong). There was no external funding source for this study. The authors have no conflict of interest to declare.</P> <P><B>Results</B></P> <P>Re-collapse occurred in 31 of 208 patients (14.9%). In this group, age, the proportion of male gender, preoperative height loss, and preoperative wedge angle were significantly greater than the well-maintained group. Multivariable logistic regression analysis identified two independent risk factors: age (adjusted odds ratio 1.084, p=.002) and body height loss (adjusted odds ratio 1.065, p=.003). According to the decision-making tree, age (>43 years) was the most discriminating variable, andpreoperative body height loss (>54%) was the second. In this model, the re-collapse rate was zero in ages less than 43 years, and among those remaining, nearly 80% patients with greater than 54% of body height loss belonged to the re-collapse group.</P> <P><B>Conclusions</B></P> <P>The independent predictors of re-collapse after posterior instrumented fusion for T-L burst fracture were the age at operation (>43 years old) and preoperative body height loss (>54%). Carefu

비구부 재치환술후 발생하는 탈구의 위험 요인

서유성 ( You Sung Suh ),소재완 ( Jae Wan Soh ),박종석 ( Jong Seok Park ),임수재 ( Soo Jae Yim ),이병일 ( Byung Ill Lee ) 대한고관절학회 2006 Hip and Pelvis Vol.18 No.3

목적: 일차성 인공 고관절 전치환술후 여러 가지 원인에 의해 재치환술을 시행 받은 환자중 비구컵의 교체 없이 폴리에틸렌 삽입물 교환만 시행 받은 환자에서 탈구가 발생하는 경향이 있어 그 원인과 예방 방법에 대해 고찰해 보고자 한다. 대상 및 방법: 일차성 인공 고관절 전치환술후, 비구부만 재치환술을 받은 28예를 대상으로 하였다. 28예중 남자가 20예, 여자가 8예였고, 재치환술시 평균 연령은 55세였으며, 28예 모두 후외방 도달법으로 수술하였다. 17예에서 비구컵, 폴리에틸렌 삽입물과 인공 대퇴 골두 모두를 교환하였고, 10예에서 폴리에틸렌 삽입물과 인공 대퇴 골두만 교환하였으며, 1예에서 폴리에틸렌 삽입물 교환만 하였다. 결과: 재치환술을 시행한 28예 중에서 총 7예에서 탈구가 발생하였다. 7예 모두 비구컵 교체 없이 폴리에틸렌 삽입물과 인공 대퇴 골두만 교체한 경우였다. 또한 탈구가 발생한 7예 모두에서 재치환술후 올바른 자세 유지가 안되면서 조기 체중 부하를 시행하는 등 환자의 협조가 안되었다. 결론: 고관절 재치환술의 방법중 저자들은 비구컵 교체 없이 폴리에틸렌 삽입물과 인공 대퇴 골두만 교체한 경우 새롭게 탈구가 발생하는 경향이 있음을 발견하였는데, 그 주원인으로는 부적절한 연부 조직 장력과 고관절부의 이완 등으로 생각하고, 따라서 재치환술시 대퇴 경부 길이를 증가시키거나, 가장자리가 상승된 폴리에틸렌 삽입물을 사용하거나, 비구컵을 적절한 위치로 재조정하는 것이 필요하고, 또한 재치환술후 조기에 고관절 외전 보조기를 착용하는 것도 탈구의 위험성을 낮추는 방법이라 사료된다. Purpose: To analyze the causes and to prevent dislocations of the hip joint that occur in patients who underwent revisions of total hip arthroplasties by changing only the polyethylene liners and femoral heads, subsequent to primary total hip arthroplasties. Materials and Methods: We evaluated 28 patients who underwent acetabular component revisions of total hip arthroplasties subsequent to primary total hip arthroplasties. The average age of the patients was 55 years old and all 28 patients had operations through the posterolateral approach. In 17 of the cases, the acetabular cups, polyethylene liners, and femoral heads were changed; in 10 cases, just the polyethylene liners and femoral heads were changed; and in 1 case, only the polyethylene liner was changed. Results: We observed 7 cases of hip dislocations that occurred among a total of 28 cases after revisions of total hip arthroplasties. In all 7 cases, the polyethylene liners and femoral heads were changed, but not the acetabular cups. In additional, in all 7 cases of dislocation, the patients were non-compliant and started weight-bearing prematurely after revisions of the total hip arthroplasties Conclusion: We observed new dislocations in the 7 cases in which the polyethylene liners and femoral heads were changed. The main reasons were inadequate soft tissue tension and hip joint laxity. Therefore, it is necessary to increase the neck length, use elevated rim polyethylene liners, readjust the acetabular cups to their optimal positions, and apply hip abduction braces to patients early after revision of total hip arthroplasties in order to lessen the danger of dislocations.

악성 섬유성 조직구종의 반복된 무계획적 절제(단순 낭종으로 오인된 악성 섬유성 조직구종): 증례 보고

소재완,김우종,김창현,권세원,김한조,Soh, Jae-Wan,Kim, Woo-Jong,Kim, Chang-Hyun,Kwon, Sei-Won,Kim, Han-Jo 대한근골격종양학회 2012 대한골관절종양학회지 Vol.18 No.2

73세 남자환자가 내원 8개월 전 좌측 원위 대퇴부의 연부 조직 종괴로 타 병원에서 절제술을 시행받은 뒤, 재발하여 4개월 뒤 재수술을 받았으나, 수술 부위의 치유되지 않는 창상을 주소로 내원하였다. 타 병원에서 시행한 조직 검사 소견은 단순 낭종이었다. 수술 소견상 종괴는 외측 광근의 근막층을 침범하면서 경계가 불규칙하며 주변으로 유착되어 있어, 종괴로부터 5 cm 경계를 확보하여 단순 절제술을 시행하였다. 본원 조직검사 결과, 악성 섬유성 조직구종으로 진단되어 추가적인 방사선 치료를 시행하였다. 수술 후 1년째까지, 크기가 증가되거나 타 부위에 전이되는 소견은 관찰되지 않았다. 단순 낭종으로 생각하고 절제술을 시행하였으나, 악성 섬유성 조직구종으로 확진되었던 경우로, 종양 절제술은 수술 전 세밀한 검사 및 진단이 필요할 것으로 사료된다. A 73-year-old male was admitted for unhealed wound. Eight months ago, the patient had been operated for excision of soft tissue mass on left distal thigh area in previous hospital and after 4 months from first operation, had been reoperated because of recurrence. The pathologic diagnosis of previous operation was simple cyst. In operating finding, the mass invaded the vastus lateralis fascia and had irregular margin and adhesion. We carried out simple excision with retaining 5 cm of free margin from the mass. The pathologic diagnosis of our hospital was malignant fibrous histiocytoma, and then the patient was performed radiation therapy. In 1 year follow-up, there was no significant finding either increasing mass size or metastasis. We misdiagnosed as simple cyst and then performed simple excision, however finally pathologic diagnosis confirmed as malignant fibrous histiocytoma. It is considered to operate a mass that preoperative proper evaluation and diagnosis are required.

Prognostic factors affecting oncologic outcomes in patients with locally recurrent rectal cancer: impact of patterns of pelvic recurrence on curative resection

Park, Jea-Kun,Kim, Young-Wan,Hur, Hyuk,Kim, Nam-Kyu,Min, Byung-Soh,Sohn, Seung-Kook,Choi, Young-Deuk,Kim, Young-Tae,Ahn, Jung-Bai,Roh, Jae-Kyung,Keum, Ki-Chang,Seong, Jin-Sil Springer-Verlag 2009 Langenbeck's archives of surgery Vol.394 No.1

단순 방사선에서의 한국인의 정상 근위 대퇴부의 해부학적 측정: 항회전 근위 대퇴 골수정을 이용한 수술 시 문제점

박종석 ( Jong Seok Park ),김우종 ( Woo Jong Kim ),소재완 ( Jae Wan Soh ),장병웅 ( Byung Woong Jang ),김태헌 ( Tae Heon Kim ),서유성 ( You Sung Suh ) 대한고관절학회 2011 Hip and Pelvis Vol.23 No.4

목적: 한국인의 근위 대퇴부를 측정하여 항회전 근위 대퇴 골수정 삽입 시 문제점을 개선하고자 한다. 대상 및 방법: 2007년 2월부터 2011년 4월까지 대퇴부 전자간 골절로 내원하여 항회전 근위 대퇴 골수정으로 치료 받은 환자 230예를 대상으로 하였다. 단순 방사선을 이용하여 건측 대퇴부의 경간각과 골수정이 삽입되는 골수강에서 협부의 직경 및 환측의 수술 후 대전자부터 근위 골수정까지 돌출되어 있는 길이를 측정하여 평균, 표준편차를 계산하였고 성별과 측정값간의 상관관계를 알아보고자 한다. 결과: 평균 경간각은 129.7°(111.0~138.3°), 직경은 14.5 mm(9.7~23.1 mm), 돌출 길이는 5.5 mm(1.5~15.3 mm)를 나타내었다. 통계학적 결과로 경간각과 성별은 유의한 차이가 있었다(p=0.000). 협부의 직경과 성별은 유의한 차이를 보이지 않았다(p=0.775). 돌출 길이와 성별의 상관관계도 성별과 유의한 차이를 보이지 않았다(p=0.753). 결론: 항회전 근위 골수정을 이용한 대퇴부 전자간 골절 수술에서 기구 선택이 제한적이었던 경험을 토대로 한국인의 해부학적 대퇴부의 경간각과 지름 및 골수정의 돌출 길이를 제시하며 한국인 체형에 맞는 골수정 규격의 다양화와 골수정의 근위부 길이가 좀 더 짧은 새로운 기구 제작에 사용될 수 있을 것이라 사료된다. Purpose: We propose to improve the use of Proximal Femoral Nail Anti-rotation in Korea by reporting anatomical measurements of the normal Korean proximal femur. Materials and Methods: A total of 230 patients were enrolled who had all experienced a femoral intertrochanteric fracture and undergone the Proximal Femoral Nail Anti-rotation surgical procedure between February 2007 and April 2011. We measured the neck-shaft angle and endosteal width at the isthmus of a normal femur, and the distance between the greater trochanter and the nail tip of the Proximal Femoral Nail Anti-rotation in post-operative plain radiography. We analyzed the average and standard deviations of the measurements. We also investigated correlations with the patient gender. Results: The average neck-shaft angle and endosteal width at the isthmus were 129.7°(111.0~138.3°) and 14.5 mm (9.7~23.1 mm), respectively. The average protruded nail length was 4.9 mm (1.0~15.0 mm). The femur neck-shaft angle had a correlation ratio with gender (p=0.000). However, the endosteal width at the isthmus level and the protruded nail length had no correlation ratio with gender (p=0.108, 0.573, respectively). Conclusion: Until now, in intertrochanteric fracture operations using Proximal Femoral Nail Anti-rotation, the selection of devices has been extremely limited. Through this study we present the average Korean anatomical neckshaft angle, endosteal width of the femur, and protruding length of the nail tip. We expect that these numerical values can be used in the production of new devices with shorter proximal nails, which would be more appropriates for Koreans.

무시멘트 인공 고관절 전치환술 시 대퇴 스템의 중립위 삽입을 위한 유용한 방법

김우종 ( Woo Jong Kim ),박종석 ( Jong Seok Park ),소재완 ( Jae Wan Soh ),지정우 ( Jung Woo Ji ),노재휘 ( Jae Hwi Noh ),원성훈 ( Sung Hun Won ),장병웅 ( Byung Woong Jang ),김창현 ( Chang Hyun Kim ),서유성 ( You Sung Suh ) 대한고관절학회 2012 Hip and Pelvis Vol.24 No.4