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임의의 각을 갖는 스트립 線路의 BEND 不連續 特性에 관한 연구
양승인,윤의중,전주성 崇實大學校 1988 論文集 Vol.18 No.-
The purpose of this study is to evaluate the discontinuity effects of the bend. The scattering parameters are compared at various frequencies to study bend discontinuity effects of the stripline with arbitrary bending angle. These results may be useful in the computer-aided design of microwave integrated circuits.
20∼30대에서 발생한 대퇴 경부 골절에 대한 내고정술 후 결과
윤의성 ( Ui Seoung Yoon ),김진수 ( Jin Soo Kim ),민학진 ( Hak Jin Min ),서재성 ( Jae Seong Seo ),윤종필 ( Jong Pil Yoon ),정주영 ( Joo Young Chung ) 대한골절학회 2010 대한골절학회지 Vol.23 No.1
목적: 20∼30대에서 발생한 대퇴 경부 골절의 내고정술 후 결과를 후향적으로 분석하였다. 대상 및 방법: 1998년부터 2005년까지 대퇴 경부 골절로 내고정술을 시행한 20∼30대 환자 중 술 후 최소 2년 이상 추시 가능하였던 20예를 대상으로 하였다. 평균 연령은 32.2세(범위; 21∼39세)였고, 평균 추시 기간은 26.3개월(범위; 24∼45개월)이었다. 골절의 양상은 술 전 시행한 단순 방사선 검사에서 Garden 분류 I형 6예, II형 10예, III형 4예였다. 골절의 해부학적 위치에 따른 분류는 골두하 골절 7예, 중간 경부 골절 9예, 하경부 골절 4예였다. 전례에서 수상 후 12시간 이내에 수술적 치료를 시행하였으며, 수술적 치료는 해부학적 정복을 얻은 후 유관나사를 이용하여 내고정술을 시행하였다. 추시 시 임상 및 방사선학적 검사를 바탕으로 수술적 치료 결과를 분석하였다. 결과: 전례에서 수술 직후 시행한 단순 방사선 검사에서 Garden 정렬 지수에 만족하는 해부학적 정복을 얻었다. 술 후 4.5개월(범위; 3∼6개월)에 전례에서 골유합을 얻었다. 합병증으로 대퇴 골두 무혈성 괴사가 전체 환자 중 7예(35.0%)에서 발생하였다. 무혈성 괴사의 발생 시기는 술 후 평균 10.7(9∼15)개월이었다. 비전위성 골절(Garden I, II)에서 5예(31.3%), 전위성 골절(Garden III)에서 2예(50.0%)가 발생하였고, 골절의 해부학적 위치에 따라 골두하 골절 4예, 중간 경부 골절 3예에서 발생하였다. 결론: 20∼30대에서 발생한 전위성과 비전위성 대퇴 경부 골절의 수술적 치료 결과 두 군 간의 합병증으로 대퇴 골두 무혈성 괴사의 발생률엔 유의한 차이를 보이지 않았다. Purpose: To retrospectively analysis of results of operatively treatment for femoral neck fracture occurred in twenties to thirties. Materials and Methods: 20 patients were selected whom we were able to follow up at least 2 years after internal fixation for femoral neck fracture in twenties to thirties from 1998 to 2005. Mean age was 32.2 (21∼39) and average follow up period was 26.3 (24∼45) months. According to preoperative X-ray, there were 6 cases for Garden classification stage I, 10 for stage II and 4 for stage III, and 7 cases for subcapital fracture, 9 for transcervical fracture, 4 for basicervical fracture. In all cases, operations were performed within 12 hours after the injury. The operations were done after satisfying reduction with the Garden alignment index, with three cannulated screws for internal fixation. Postoperative results were analyzed by clinical symptoms and radiological examinations during follow up periods. Results: In immediately postoperative radiological examination, satisfying anatomical reduction with Garden alignment index was obtained in all cases, and unions were obtained within 4.5 months after the operation (3∼6 month). Avascular necrosis of femoral head occurred in 7 cases of all patients (35.0%). The average time of occurrence of avascular necrosis of femoral head after operation was 10.7 months (9∼15 months). Avascular necrosis was occutted 5 (31.3%) in fracture without displacement (Garden stage I, II), 2 (50.0%) in fracture with displacement (Garden stage III) and 4 in subcapital fracture, 3 in transcervical fracture. Conclusion: The incidence of avascular necrosis of femoral head after the operation for displaced and nondisplaced femoral neck fracture between twenties and forty years was no significant difference.
( Seong-kyu Kim ),( Ui Hong Jung ),( Jung-yoon Choe ) 대한류마티스학회 2020 대한류마티스학회지 Vol.27 No.1
Objective. The aim of this study was to determine the relationships of serum and urine uric acid with severity or activity in knee osteoarthritis (OA). Methods. A total of 42 patients with knee OA was enrolled, together with 58 healthy controls. Serum uric acid and spot urine uric acid levels were assessed for all patients. The severity and activity of knee OA were assessed by musculoskeletal ultrasound (MSUS) and plain radiography of the knee joint. Ultrasonographic abnormalities in knee OA includedsynovial hypertrophy, suprapatellar effusion, cartilage degradation, and osteophyte formation. Kellgren-Lawrence (K-L) grade was used to evaluate radiological progression of knee OA. Results. Patients with K-L grade III had a higher urine uric acid/creatinine ratio compared to those with K-L grade I (p=0.043). Patients with synovial hypertrophy had higher serum uric acid level compared to those without synovial hypertrophy (p=0.016). The urine uric acid/creatinine ratio was higher in patients with cartilage degradation compared to those without cartilage degradation (p=0.022). Serum uric acid was significantly associated with synovial hypertrophy thickness (r=0.375, p=0.018) but not with cartilage thickness after adjusting for age and body mass index. Lower urine uric acid was related with knee OA compared to healthy controls (odds ratio=0.974, 95% confidence interval 0.954∼0.994, p=0.013). Conclusion. The results of our study suggest that serum and urine uric acid reflects synovial inflammation based on MSUS and radiographic progression and then is associated with the pathogenesis of knee OA. (J Rheum Dis 2020;27:51-60)
Yoon, Heun-Joo,Song, Ji-Eun,Um, Yoo-Jung,Chae, Gyung Joon,Chung, Sung-Min,Lee, In-Seop,Jung, Ui-Won,Kim, Chang-Sung,Choi, Seong-Ho Institute of Physics Pub 2009 Biomedical materials Vol.4 No.4
<P>The aim of this study was to evaluate the healing of self-contained coronal defects on a sand-blasted, large-grit, acid-etched (SLA) surface implant, which had a calcium phosphate (CaP) coating applied by ion-beam-assisted deposition (IBAD). We also evaluated the effect of heating the coating to different temperatures. The CaP-coated SLA implants exhibited a slightly larger bone healing capacity in the self-contained coronal defect than SLA implants, indicating that combining SLA surface implants and a CaP coating by the IBAD method had synergistic effects on bone healing. There was no difference in the healing capacity between 350 °C and 450 °C heat treatment of the coating layer.</P>
( Seong-kyu Kim ),( Ui Hong Jung ),( Ji-won Kim ),( Jung-yoon Choe ) 대한류마티스학회 2021 대한류마티스학회지 Vol.28 No.1
Objective. There is a debate over the relevance of ultrasound abnormalities to the pain, functional impairment, and radiologic severity in hand osteoarthritis (OA). This study aims to determine the association between ultrasound abnormalities and clinical, functional, and radiographic measures in hand OA. Methods. A total of 66 patients was consecutively enrolled. All patients with gray-scale synovitis, joint effusion, and osteophytes were examined by ultrasound for 20 hand joints. Radiographic changes in both hands were evaluated by the Kellgren-Lawrence (K-L) grading system and were described as total radiographic severity score and number of affected joints. Other measures were also assessed, including each patient’s visual analogue scale for pain, the Functional Index for Hand Osteoarthritis for functional disability, and grip and pinch strength for hand muscle strength. Results. In total, 10 patients with gray-scale synovitis, 35 with joint effusion, and 66 with osteophytes were detected in hand OA scans on ultrasound. Osteophytes on ultrasound were significantly associated with total radiographic severity score and number of affected joint (r=0.293, p=0.003 and r=0.336, p<0.001, respectively). In addition, there were weak associations of synovitis and joint effusion with radiographic changes. Patients with higher total radiographic severity score showed larger number of ultrasound-detected abnormalities, such as synovitis, joint effusion, and osteophytes (p=0.011, p=0.002, and p<0.001, respectively). Conclusion. This study shows that ultrasound findings, especially osteophytes, were associated with radiographic changes based on K-L grade, but not clinical and functional status in hand OA. (J Rheum Dis 2021;28:17-24)
제 1-2 경추간 아탈구에 의한 경추 척수증에 시행한 분절 나사 고정술을 이용한 간접 감압술
김윤종(Yoon Jong Kim),김경환(Kyeong Hwan Kim),원종화(Jong Hwa Won),민학진(Hak Jin Min),윤의성(Ui Seong Yoon),염진섭(Jin Sup Yeom) 대한정형외과학회 2007 대한정형외과학회지 Vol.42 No.6
제 1-2 경추간 아탈구로 인한 심한 척수 압박과 척수증이 있는 경우, 수술의 목적은 척수를 감압하고 견고한 내고정 및 유합을 얻는 것이다. 척수를 압박하는 골조직을 절제하는 직접 감압술에는 경구 감압술과 제 1 경추 후궁 절제술이 있으나, 이들은 합병증 발생률이 높거나 골 유합을 얻기 힘들다는 단점이 있다. 간접 감압은 골조직 절제 없이 아탈구만을 정복하여 내고정함으로써 척수를 감압하는 것으로, 심한 척수 압박으로 인한 척수증에 대한 간접 감압은 국내에서는 보고된 바 없다. 저자들은 제 1-2 경추간 아탈구로 인한 심한 척수증에 대해 제 1-2 경추간 분절 나사 고정술을 이용한 간접 감압술을 시행하여 만족할 만한 정복 및 감압과 척수증의 호전을 얻었기에 이를 보고하고자 한다. The main aims of surgery for severe cord compression and myelopathy caused by atlantoaxial subluxation are decompression of the spinal cord and achievement of rigid fixation and fusion. Direct decompression by resecting the bony structures that compress the spinal cord includes transoral decompression and resection of the posterior arch of the atlas. The shortcomings of these procedures are a high complication rate and a relatively low rate of union. Indirect decompression can be performed by a reduction of the subluxation and fixation without bone resection. To the best of our knowledge, there are no domestic reports on the use of indirect decompression for severe cord compression and myelopathy for atlantoaxial subluxation. We report a case of a patient that had atlantoaxial subluxation and severe myelopathy; satisfactory reduction of the subluxation and decompression with an improvement in the myelopathy symptoms was achieved by indirect decompression using segmental screw fixation.