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프런트 엔드 쿨링팩 일체형 냉각 모듈의 성능평가에 관한 연구
성기천(Gi-Cheon Sung),이재영(Jae-Young Lee),김종기(Jong-Ki Kim),이홍열(Hong-Yeol Lee),김종철(Jong-Chul Kim),박정상(Jeong-Sang Park),김화성(Hwa-Sung Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
This study was performed the performance evaluation of integrated cooling module for front end cooling pack system. It was found the optimal geometry of integrated fin to reduce the heat conduction from the radiator to the condenser. The integrated fins have been applied to the radiator and the condenser. Numerical comparison of the performance is also made with that of the conventional separated fin. The heat capacity and pressure drop characteristics have been experimentally studied for the separated and integrated module. The results obtained indicate that the heat transfer performance of radiator is increased by 13%, outlet temperature of evaporator is decreased by 32% compared with those of the conventional separated module.
원위 경골 골절에 대한 단계적 최소 침습적 금속판 고정술
박성기 ( Sung Ki Park ),오창욱 ( Chang Wug Oh ),오종건 ( Jong Keon Oh ),김경훈 ( Kyung Hoon Kim ),민우기 ( Woo Kie Min ),박병철 ( Byung Chul Park ),정원주 ( Won Ju Jeong ),인주철 ( Joo Chul Ihn ) 대한골절학회 2010 대한골절학회지 Vol.23 No.3
목적: 개방성 창상 또는 연부 조직 손상을 동반한 원위 경골 골절을 단계적 최소 침습적 금속판 고정술로 치료하고 결과를 평가하였다. 대상 및 방법: 원위 경골 골절 환자 20예 (평균 연령, 47.8세)를 대상으로 하였다. AO 분류상 A형 4예, C형 16예였고 8예의 개방성골절이 포함되었다. 가교 외 고정 후 평균 23.9일에 최소 침습적 금속판 고정술을 시행하였다. 최종 추시 때 골유합 및 정렬에 대한방사선적 평가를 하였고, 족관절 운동 범위 및 AOFAS (American Orthopedic Foot & Ankle Society) 점수로 기능적 평가를 하였다. 결과: 20예 중 17예 (85%)에서 평균 21.3주 (범위, 12∼28주)에 일차 골유합을 얻었고 3예의 불유합에서 골 이식이 필요하였다. AOFAS 점수는 평균 88.5점 (범위, 67∼92점이었고, 족관절 운동 범위는 평균 49.2도 (족저 굴곡 37.4도, 족배 굴곡 11.8도)였다. 합병증으로서 경도의 부정정렬 2예, 갈퀴 족 변형 1예, 비골 신경병증 1예가 있었다. 60세 이상의 환자에서 AOFAS 점수가 낮았으나, 골절 형태 등의 다른 인자들은 결과에 영향을 미치지 않았다. 결론: 개방성 골절을 포함한 연부 조직 손상을 동반한 원위 경골 골절에서 단계적 최소 침습적 금속판 고정술은 심부 감염과 연부조직 합병증을 감소시키고 만족스러운 결과를 얻을 수 있을 것으로 생각된다. Purpose: To assess the result of staged minimally invasive plate osteosynthesis (MIPO) for distal tibial fracture with an open wound or injured soft tissue. Materials and Methods: In 20 patients (mean age, 47.8 year-old) with distal tibial fractures, there were 4 type A fractures and 16 type C fractures based on the AO classification system. Eight of the 20 patients had open fractures. MIPO was performed on average 23.9 days after bridging external fixation. At the final follow-up, we assessed the radiological results of bone union and alignment. Functional results were also evaluated by measuring the degrees of ankle motion and the American Orthopedic Foot & Ankle Society (AOFAS) scores. Results: Seventeen of 20 cases (85%) achieved primary union at an average of 21.3 weeks. There were 3 cases of nonunion requiring a bone graft. The mean AOFAS score was 88.5 (range, 67∼92) and the average range of ankle motion was 49.2o (plantarflexion: 37.4o, dorsiflexion: 11.8o). Complication included 2 cases of minor mal-alignment, 1 case of claw toe and 1 case of peroneal neuropathy. Patients over the age of 60 had lower functional results. Additional factors did not affect the final results. Conclusion: Staged MIPO may achieve satisfactory results in distal tibial fractures with soft tissue compromise, decreasing deep infections and soft tissue complications.
박성기,권해욱 ( Sung Ki Park,Hae Wook Kwon ) 한국주조공학회 1988 한국주조공학회지 Vol.8 No.2
N/A The effect of excess sulfur, which is defined as the following equation, on the graphite structure of cast iron, which were treated with the addition of 5% Mg-Fe-Si and aluminum of 0.1 to 0.6%, was studied. △S=final %S -0.34(%RE) -1.33(%Mg) Nodularity increased as the excess sulfur decreased and nodular graphite structure over 80% was obtained with the excess sulfur of less than -0.0285%. Compacted-vermicular graphite over 80% and all flake graphite structures were obtained with the values between -0.0155 and 0.0005% and of more than 0.0020%, respectively. The working range of excess sulfur for the production of more than 80% compacted-vermicular graphite structure was expanded as the amount of aluminum addition increased. Aluminum in the liquid phase inhibits the nodularization of graphite by promoting the segregation of sulfur in it.
클라우드 기반의 모바일 지능형 관제시스템에서의 움직임 감지 알고리즘에 관한 연구
박성기,김옥환,Park, Sung-Ki,Kim, Ok-Hwan 한국전기전자학회 2015 전기전자학회논문지 Vol.19 No.1
This study suggested the mobile intelligent management system based on the cloud service. The mobile intelligent management system are composed of cloud server, middleware and sensor networks. Each modules are controlled on mobile environment and observed operating status of each apparatus for environment. In this pater, the image-based moving detection algorithm applied in order to detect an intruder and average 12.3% are measured in moving detection experiments. it was confirmed the validity of the security device. 본 논문에서는 클라우드 기반의 모바일 지능형 관제시스템 개발을 제안하였다. 모바일 지능형 관제시스템은 클라우드 서버, 미들웨어, 센서로 구성되어 있다. 각 모듈들은 모바일 환경에서 제어되고 주변 환경에 대한 각 기기의 동작 상태를 모니터링 할 수 있다. 본 논문에서는 침입자를 감지하기 위해 영상 기반 움직임 감지 알고리즘을 적용하였고, 움직임 감지 실험에서 움직임 검출율이 평균 12.3% 높게 측정되어 보안장치로써의 타당성을 확인하였다.