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개별 블레이드 피치 제어 방식을 이용한 수직축 풍력발전기의 성능 해석 및 시스템 구현
정인오(In Oh Jeong),이윤한(Yun Han Lee),황인성(In Seong Hwang),김승조(Seung Jo Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
This paper describes a research for the performance improvement of the straight-bladed vertical axis wind turbine. To improve the performance of VAWT, the individual blade pitch control method is adopted. For the wind turbine, CFD analysis is carried out by changing blade pitch angle according to the change of wind speed and wind direction. By this method, capacity and power efficiency of VAWT are obtained according to the wind speed and rotating of rotor, and could predict the overall performance of VAWT. It was manufactured to verify performance of the experimental system that consists of rotor including four blades and base. Furthermore, torque sensor and power generator were installed. Also, active controller which can change the pitch angle of the individual blade according to the wind speed and direction was used.
정인오(In-Oh Jeong),최윤미(Yun-Mee Choe),김장용(Jang Young Kim),최선근(Sun Keun Choi),허윤석(Yoon Seok Heo),이건영(Keon Young Lee),김세중(Sei-Joong Kim),조영업(Young Up Cho),안승익(Seung Ik Ahn),홍기천(Kee Chun Hong),신석환(Seok Hwan 대한외과학회 2009 Annals of Surgical Treatment and Research(ASRT) Vol.77 No.6
Purpose: The mortality of intestinal atresia has decreased remarkably owing to prenatal diagnosis, development of diagnosis method, neonatal intensive care, surgical technique, total parenteral nutrition and performing of early surgery. The clinical consideration of our experience about intestinal atresia would be helpful in the understanding of disease. Methods: We reviewed the clinical presentation, hospital days, diagnosis method, surgical method, postoperative early complication and mortality based on medical records, retrospectively, in 32 cases of intestinal atresia encountered at Inha University Hospital between March 1997 and May 2009. Results: The involved sites were; duodenum (n=11; 34.4%), jejunoileum (n=20; 62.5%), and colon (n=1; 3.1%). The mean postoperative fasting time was 6.38 days. The postoperative morbidity was 9.4% and mortality was 3.1%. Conclusion: Complete recovery from intestinal atresia can be insured by prompt diagnosis, early surgery and careful neonatal intensive care.
김성준(Sung Joon Kim),정인오(In Oh Jeong),최익현(Ik Hyeon Choi),안석민(Seok Min Ahn) 한국항공우주연구원 2008 항공우주기술 Vol.7 No.2
본 논문에서는 놋취가 있는 복합적층판의 강도를 예측하는 여러 가지 파손모델을 검토하였다. 놋취가 존재하는 복합적층판의 대표적인 정적 실험결과를 공개된 문헌을 통하여 수집하였다. T300/5208에 대한 강도데이타를 분석하였으며 파손모델에 관련된 여러 가지 매개변수를 결정하였다. 놋취강도 데이터를 여러 가지 파손모델과 비교하였다. This study reviews several fracture models for predicting the notched strength of composite laminates. Representative experimental results on the notched strength of composite laminates containing a large notch subjected to static uniaxial tensile loading have been collected from open literature. Notched strength data for T300/5208 are analyzed. and the various parameters associated with the fracture models have been determined for laminates. Notched strength data sets are compared with fracture models and the applicability of the different fracture models in predicting the notched strength of composite laminates is discussed.
김성준(Sung Joon Kim),정인오(In Oh Jeong),최익현(Ik Hyeon Choi),심재열(Jae-Yeul Shim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The coin-tap test has the ability to indicate damage in a structural element due to a localized change of stiffness. The change in vibration signature may be detected by measurement of the dynamic contact force. A coin-tap test method for discriminating between measurements made on sound and delaminated structures is present. It has been shown that the characteristics of impact force histories from a structure during a tap are changed by the presence of defect beneath the surface of the structure. In this paper, an effective method has been developed for the impact response of composite plates on arbitrary impactor shape.