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배진규 ( Jin-gyu Bae ),이영규 ( Young-kyu Lee ),박범영 ( Beom-young Park ),임효선 ( Hyo-seon Lym ),정봉수 ( Bong-su Jung ) 한국동물위생학회 2016 韓國家畜衛生學會誌 Vol.39 No.1
The Autofom is a equipment for predicting the amount of pig carcasses meat using the 16 ultrasonic sensors to measure in real time and it was established in Dodram LPC in Gyeonggi Province of Korea for the first time. This study was carried out to validate the reliability of Autofom statistically and to establish guideline for developing a analytic formula through comparing the measurement between Autofom and dissection. The ham parts of sixty-six pig carcasses were measured with Autofom and by two experimental performers. The weight means and standard deviations of ham parts including bone by measurements with Autofom and dissection were 10.69±0.81 kg and 10.77±0.94 kg, respectively a strong positive correlation (P<0.01) was identified, with a coefficient of determination (R2) of 0.82. The weight means and standard deviations of lean ham parts by measurements with Autofom and dissection were 7.41±0.58 kg and 7.42±0.89 kg, respectively a strong positive correlation (P<0.01) was identified, with a coefficient of determination (R2) of 0.72. The root mean square errors of two groups were 0.40 and 0.50, respectively.
복합재료 블레이드 단면 해석 프로그램(Ksec2d-AE)의 신뢰성 검증
배재성(Jae-Seong Bae),김현식(Hyun-Sik Kim),배진규(Jin-Kyu Bae),임태현(Tae-Hyun Lim),황재민(Jae-Min Hwang),정성남(Sung Nam Jung) 한국항공우주학회 2018 韓國航空宇宙學會誌 Vol.46 No.4
본 연구에서는 유한요소법 기반의 단면 특성치 해석 프로그램인 Ksec2d-AE의 정확성을 검증함으로써, 학부 수준의 비행체 구조해석 및 설계 시 활용가능성을 제시하고자 한다. 이를 위해 다양한 요소를 적용하여 Ksec2d-AE 로부터 계산된 단면강성계수 결과에 대한 유한요소의 수렴성을 확인하였다. 또한 Ksec2d-AE로부터 구한 단면강성계수를 상용 구조해석 프로그램인 MSC NASTRAN 으로부터 구한 강성계수와 비교하고, 주요 공학적 중심치(인장 중심, 전단 중심, 주 굽힘축)의 특성에 부합하게 구조물이 거동하는지 확인함으로써 Ksec2d-AE의 단면강성계수 및 중심치 결과를 검증하였다. 본 연구를 통하여 Ksec2d-AE 프로그램의 유용성을 확인하였다. In this study, the accuracy and efficiency of a composite rotor blade cross-section analysis program, Ksec2d-AE, which is available at an educational web-based platform called EDISON-CSD, are assessed for possible use in undergraduate structural analysis projects. To this purpose, the convergence of cross-sectional constants by varying the number of finite elements in the cross-section of a wind turbine blade is investigated. The stiffness constants along with the cross-sectional engineering offsets obtained using Ksec2d-AE are validated against a 3D finite element analysis program MSC NASTRAN.