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박상원,김학윤,공보석,전제영,이홍건 대한골절학회 1989 대한골절학회지 Vol.2 No.1
The tibial condylar fractrue involving articular surface of the proximal tibia is common in traffic accidents, In the tibial'condylar fracture, the injuries of soft tissue such as ligaments and menisci are frequently accompanied and the weight bearing surface are involved, too. So significant disability of the knee joint often results from the tibial condylar fracture. The fifty cases of the tibial condylar fracture treated at the orthopaedic department of Korea Univerity Hospital from January, 1982 to December, 1986 have been followed for 1 to 3 year The results obtained were aa follows: l. Among the fifty patients, the ratio of sex was 2.1:1 as male predominant, and the prevalent age distributions were in the 3rd and 6th decade. 2. The most common cause of injury was traffic accident in 32 cases(64%). Second in frequency were falls in 7 cases(14%). 3. The laterality of injury was left in 29 cases(58%), right in 21 cases(42%) The locations of injury were lateralcondyle in 34 cases(64%),medial condyle in eight cases(16%) and bicondyles in eight cases(16%). 4. According to the Hohls dassification, the most common was type g in nineteen cases(38%). 5. The most common associated injuries were ipsilateral fibular fracture in 15 cases(30%) and ligament injury in 15 cases(30%) especially frequent in type g and m Among the ligament injuries, the medial collateral ligament tearing was eight cases(53%) as predominant 6. Fifteen cases(30%) were treated by cast immobilization, two cases(4%) by skeletal traction. Thirty-three cases(66%) were treated by operative method. 7. Thirty-seven cases(74%) revealed the rating of acceptable$quot; group according to Roberts criteria.
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Promotion and Work Incentive for a Future Job
박상원 한국경제학회 2016 The Korean Economic Review Vol.32 No.2
We presented a simple model in which agents could determine effort level with the prospect of promotion. Even without any increase of payment or fringe benefits, promotion could provide an incentive for hard work because it could be a signal of one’s ability and the possibility of a better job offer in one’s future career. Outside firms that cannot observe the agents’ current performance use promotion status in order to predict the agents’ ability. We point out that some of the results of the standard career concerns model do not hold here. Because promotion is a binary decision, extra effort becomes effective only when the promotion has not been made without it. This shows that the dispersion of an agent’s ability and noise as well as well-known signal-to-noise ratio play important roles in promotion.
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박상원,이상우,Park, Sang-Won,Lee, Sang-U 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.11
A flow stabilizer, which is made of a honeycomb and three different mesh screens, is located downstream of a butterfly-type valve, for the reduction of flow disturbances behind the valve. Mean flow and turbulence measurements as well as flow visualizations are conducted in the downstream region of the deepens the non-uniformity of the streamwise velocity component and turbulence. The mesh screens considerably reduce the turbulence and enhance the uniformity of mean velocities. The combination of the honeycomb and the three mesh screens results in an efficient reduction in the flow disturbances. In addition, the flow stabilizer proves to have a good performance in the suppression of turbulence at a short distance.
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박상원,박종훈,한승범,최기원,송동익,안은수 대한의학회 2009 Journal of Korean medical science Vol.24 No.2
Despite advances in surgical techniques and instrumentation, current intra-operative estimations of acetabular version in total hip arthroplasty are of limited accuracy. In the present study, two experienced orthopedic surgeons compared intra-operatively measured (using portable imaging) anteversions and vertical inclinations of acetabular components with those measured using standardized radiographs postoperatively in 40 patients. Of the all vertical inclinations measured from intra-operative radiographs, 72.5% (n=29) were within ±2°, and 97.5% (n=39) were within ±5° of those determined using post-operative radiographs, and for anteversion, 52.5% (n=21) were within ±2°, and 97.5% (n=39) were within ±5°. Post-operative radiographs demonstrated that 90.0% (n=36) of vertical inclinations and anteversions were within the adequate zone. Obviously, our method has its limitations, but the authors conclude that the method described in this article better allows surgeons to verify acetabular version intra-operatively. In particular, the described method is suitable in cases with a deformed acetabular anatomy and difficult revision surgery.
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변형률 이력 데이터를 활용한 양방향 LSTM 네트워크 기반 거더의 처짐 예측
박상원,장민우,야즈단파나 오미드 대한토목학회 2024 대한토목학회논문집 Vol.44 No.6
정밀한 안전진단은 시설물의 항속적 운영을 위한 필수지표이다. 상시 다양한 형태의 반복하중에 노출된 교량의 내하력 평가를 위해 하중재하시험을 기반으로 처짐을 계측하는 방법이 널리 활용되고 있다. 최근에는 스마트 진단 기술 발전에 힘입어 영상 정보로부터 응답을 평가하는 방법들이 제시된 바 있다. 그러나 영상 정보를 활용하는 경우 조명, 각도의 왜곡이 발생하거나, 사각지대 정보수집이 어려워 전체 거동 파악이 난해한 등의 단점이 있다. 이 연구에서는 인공지능을 기반으로 거더의 정적 시험시 계측한 변형률 데이터를 활용하여 수직 방향의 처짐을 추정하는 기법을 제시하였다. 하중 재하에 따른 변형률 이력은 명지대학교 하이브리드 구조실험센터에서 수행한 11개 거더에 대한 하중 시험으로부터 취득하였다. 모델 학습을 위하여 입력 매개변수로는 거더의 종류, 정적하중, 변형률 이력계 등으로 구성하였으며, 양방향 Long Short Term Memory(LSTM) 네트워크를 활용하여 경간 중앙에서의 처짐을 추정하는 모델을 개발하였다. 하이퍼파라미터 최적화를 통해 인공지능 모델의 성능을 개선하였고, 정합성 평가를 수행하여 성능을 검증하였다. 또한, 훈련 수준에 따른 예측 정확도와 소요 시간 분석을 통해 제시한 기법의 효용성을 평가하였다. Precise diagnosis of structural condition is essential indicator for the sustained operation of infrastructure. The load tests are widely used to assess the serviceability and safety condition of bridges that are continually exposed to various forms of repeated loading. Recently, advancement in smart diagnostic technologies have introduced methods for assessing structural responses using image data. However, when utilizing image data, challenges such as distortions from lighting and angles, as well as difficulties in collecting information from blind spots, can hinder the comprehensive understanding of structural behavior. To address these limitations, this study presents an artificial intelligence (AI) based method for estimating vertical deflections using strain data measured during static tests on girders. The strain data were obtained from load tests conducted on 11 girders at the Hybrid Structural Testing Center of Myongji University. The deep learning model was developed using a bidirectional Long Short-Term Memory (LSTM) network, with multiple input parameters including girder type, static load, and strain data. The performance of AI model was further enhanced through hyperparameter optimization, and its accuracy was verified through consistency evaluation. Additionally, the effectiveness of the proposed method was evaluated by analyzing prediction accuracy and computational time in relation to the quantity of training data.
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소각재를 이용한 공정배출 이산화탄소 저감 및 재이용 방안 연구
박상원,송경선,김원백,서창열,안지환 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
이산화탄소를 저감하기 위한 연구들이 진행중인 가운데, 최근 이산화탄소를 활용하여 저감과 동시에 자원화를 위한 연구들이 보고 되고 있다. CO2를 활용한 자원화는 촉매합성을 통한 에너지원으로의 전환과 고체형태로 전환하는 광물화가 대표적이라고 할 수 있다. 이중 CO2광물화는 반응을 위한 양이온의 원활한 공급이 필요하다. 하지만 천연자원이 부족한 국내의 실정을 고려할 때, 산업시설 등에서 배출되는 폐기물을 이용하는 방법이 이상적이라고 할 수 있다. 산업시설에서 배출되는 폐기물중 소각재는 비교적 칼슘과 중금속 등의 함유량이 높아 금속광물화 금속원으로 사용가능성이 매우 높다고 할 수 있다. 따라서 본 연구는 환경시설에서 배출되는 소각재와 공정에서 배출되는 이산화탄소를 이용하여 소각재를 재활용하고 이산화탄소를 저감할 수 있는 동시공정의 개발 타당성에 대한 기초연구를 수행 하였다. 기초연구 수행결과 소각재에 포함된 금속이온은 이산화탄소와 원활히 반응하여 금속탄산염을 생성하는 것을 확인 할 수 있었다. 또한, 저농도의 이산화탄소를 농축과정이 필요없이 안정적으로 탄산염으로 전환할 수 있는 가능성을 확인 하였다.
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