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Ender 정을 이용한 Type 3 개방성 경골 골절의 치료
이상홍,박진석,신동민,하상호 대한골절학회 1989 대한골절학회지 Vol.2 No.2
Type III open tibial fracture is difficult to treat because of frequent complications, and recently external fixation have been used successfully. Intramedullary nailing with flexible nails is now routinely performed in Type I and II open tibial fractures. Thirteen cases of Type III open tibial fractures treated with Ender nails from January 1 983 to December 1988 were identified and retrospectively reviewed. The results were as follows: 1. The patients were predominantly more cammon in male and the average age was 41 years, and most common cause was traffic accident. 2. According to the Gustilo and Andersons classification, Type III - A was 7 cases, Type III-B was 5 cases, and Type lll-C was 1 case. All 13 cases were combined fibular fracture. 3. All 13 cases were used two Ender nails, nailing methods were two antegrade insertion (7 cases), two retrograde insertion (3 cases), and one antegrade R retrograde insertion (3 cases). 8 cases were operated within one day of accident, 7 cases were used other combined metals, and 5 cases were treated with Rush pinning of fibular fracture. 4. Among the secondary additional operation required after Ender nailing, bone operation were 7 cases, soft tissue operation were 5 cases, and delayed amputation were 2 cases, 5. Among II cases except amputation, controversial camplicatians were nonunion (6 cases), chronic osteomyelitis (1 case), delayed union ll case). 6. A retrospective evaluation of 13 cases treated Ender nailing revealed that Ender nailing was simple, effective method in some selected cases of Type III open tibia fractures.
이상홍 한국디지털정책학회 2016 디지털융복합연구 Vol.14 No.4
This study proposed new methods to classify normal and epileptic seizure signals from EEG signals using peaks extracted by wavelet transform(WT) and Hilbert transform(HT) based on a neural network with weighted fuzzy membership functions(NEWFM). This study has the following three steps for extracting inputs for NEWFM. In the first step, the WT was used to remove noise from EEG signals. In the second step, the HT was used to extract peaks from the wavelet coefficients. We also selected the peaks bigger than the average of peaks to extract big peaks. In the third step, statistical methods were used to extract 16 features used as inputs for NEWFM from peaks. The proposed methodology shows that accuracy, specificity, and sensitivity are 99.25%, 99.4%, 99% with 16 features, respectively. Improvement in feature selection method in view to enhancing the accuracy is planned as the future work for selecting good features from 16 features. 본 논문에서는 가중 퍼지소속함수 기반 신경망(neural network with weighted fuzzy membership functions; NEWFM) 기반의 웨이블릿 변환(wavelet transform)과 힐버트 변환(Hilbert transform)에 의해 추출한 첨점(peak)을 사용하여 뇌파(EEG)로부터 정상 파형과 간질 파형을 분류하는 새로운 방안을 제안하였다. NEWFM의 입력을 추출하는데 다음과 같은 3개의 단계가 수행되었다. 첫 번째 단계에서는 뇌파로부터 잡음을 제거하기 위해서 웨이블릿 변환을 사용하였다. 두 번째 단계에서는 웨이블릿 계수로부터 첨점(peak)을 추출하기 위해서 힐버트 변환을 사용하였다. 또한 크기가 큰 첨점을 추출하기 위해서 첨점의 평균값보다 큰 첨점만을 선택하였다. 세 번째 단계에서는 통계적 방법을 이용하여 첨점으로부터 NEWFM의 입력으로 사용할 16개의 특징을 추출하였다. NEWFM은 이들 16개의 특징을 입력으로 사용하여 99.25%, 99.4%, 99%의 정확도, 특이도, 민감도를 각각 구하였다. 향후 연구에서는 특징선택을 이용하여 16개의 특징으로부터 좋은 특징을 선택하여 정확도를 향상시킬 계획이다.
이상홍,강신욱,조승환 대한고관절학회 2017 Hip and Pelvis Vol.29 No.4
Purpose: The aim of the current study is to report the advantage and disadvantage of total hip arthroplasty performed in direct anterior approach (DAA) by comparing it to the posterolateral approach (PLA). Materials and Methods: Twenty-five hip arthroplasty done in DAA (12 total hip arthroplasty [THA] and 13 bipolar hemiarthroplasty [BHA]) were compared with the same number done in PLA (13 THA and 12 BHA). Intraoperative assessments including operation time, anesthetic time, bleeding amount were recorded with intraoperative complications. Immediate postoperatively, position of the prosthesis and leg length discrepancy were measured and were compared between the two approaches. Results: The operation time was 22 minutes and 19 minutes longer in DAA for THA and BHA respectively while the anesthetic time difference was 26 and 10 respectively. However, these parameters showed no statistical difference. No significance was found when bleeding amount was compared. For DAA, cup alignment was within safe zone in 100% both for inclination and for anteversion while this was 83.3% and 75.0% respectively in PLA. Leg length difference was 3 mm in DAA and 5 mm in PLA but had no significant difference. Tensor fascia lata tear was the most common complication occurring in 9 patients. Conclusion: Although significant was not reached there was trend toward more operation time and anesthetic time when DAA was used. However, the trend also showed that cup and stem were likely to be in more accurate position and in adequate size which is likely due to the accurate use of fluoroscopy