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복합형 회전익 항공기 동체 설계를 위한 확장된 보 해석
박선후(Sunhoo Park),임병욱(Byeonguk Im),전태영(TaeYoung Chun),염제완(Jewan Yeom),신상준(SangJoon Shin) 한국항공우주학회 2020 韓國航空宇宙學會誌 Vol.48 No.9
본 연구에서는 복합형 회전익 항공기 동체의 설계를 위해 확장된 보 해석을 기술한다. 개발된 보 접근 방법은 등가 보강재 층 방법을 사용하여 보강재로 구성된 동체의 해석이 가능하다. 통합 정식화 보 이론에 기반하여 외피의 두께 및 적층 고려 방법을 제시하였다. 보강재가 고려된 동체에 대해 등가 보강재 층 방법을 적용하여 해석을 수행하였고, 보강재의 제원에 관한 예비 연구 결과를 도출하였으며 상용 프로그램을 이용하여 검증 및 비교를 수행했다. This paper describes an improved beam analysis for compound rotorcraft fuselage design. The present beam approach is capable of analyzing fuselage composed of stiffeners using equivalent layer methodology. Thickness of the skin and laminated layer approach are suggested based on the unified beam formulation. The analysis which considers an equivalent stiffener layer is performed for a fuselage with stiffeners and preliminary study about the specification of stiffeners is conducted and compared by the results using the existing software.
Co-rotational Plane Beam-Dynamic Tip Load를 이용한 Drone Single Arm의 최적 설계
박선후(SunHoo Park),이상구(SangGu Lee),신상준(SangJoon Shin) 한국항공우주학회 2017 韓國航空宇宙學會誌 Vol.45 No.10
본 논문에서는 단일 보의 최적 설계를 활용하여 드론 플랫폼을 구축하였다. 단일 보를끝 단 질량을 가진 외팔보로 가정하였다. 수치 최적화 이론에 기초하여, ANSYS가 얻은 유사한 결과와 비교함으로써 새로운 설계의 검증 및 최적화를 수행 하였다. 마지막으로, 이 설계는 제어 시뮬레이션에 반영되며 공진 상황을 고려한 최적의 구조 설계 요구 사항을 만족함을 보였다. This paper aims to build a drone platform based on an optimum design of its single arm. Its single arm is assumed as a cantilevered beam with a tip mass. Based on the numerical optimization theory, validation and optimization of a new design is conducted by comparing the results with the similar ones obtained by ANSYS. Finally, this design is reflected in the control simulation, and the requirement of an optimum structural design considering the resonance situation is satisfied.
비행 조건의 영향을 고려한 쿼드콥터형 무인비행체의 로터 공력 특성 예측
박선후(SunHoo Park),은원종(WonJong Eun),신상준(SangJoon Shin) 한국항공우주학회 2018 韓國航空宇宙學會誌 Vol.46 No.10
본 연구에서는 무임 회전익기의 종류인 쿼드콥터의 로터 블레이드에 대해 바람 및 비행 조건의 따른 공력특성을 예측하고자 한다. 돌풍 및 비행 조건들을 고려하기 위해 바람의 좌표계 변환 개념을 제시하였다. 강체 블레이드 플래핑 운동방정식을 고려한 깃 요소 및 운동량 이론을 이용해 개별 로터의 제자리, 전지, 상승 비행을 해석하였다. XFOIL을 사용하여 공력결과를 도출하였고, 개발된 BEMT를 이용하여 제자리 비행, 전진, 상승 조건의 검증을 수행했다. 또한 제자리 비행 실험 환경 구축 및 실험 결과와 개발된 BEMT의 비교 및 검증을 수행하였다. This paper aims to predict the aerodynamic characteristics of individual rotor for the gust and flight conditions. Transformation procedure into the wind frame is conducted to analyze the gust. Hover, forward, and climb flight conditions of an individual rotor are analyzed using the blade element momentum theory (BEMT) considering the rigid blade flapping motion. XFOIL is used to derive aerodynamic results. Validation for hover, forward flight, and climb conditions are conducted using the present BEMT. In addition, a static experimental environment is constructed. The experimental results and the present BEMT are compared and verified.
Lee, Jong-Geol,Park, Sunhoo,Bae, Chang-Hwan,Jang, Won-Suk,Lee, Sun-Joo,Lee, Dal Nim,Myung, Jae Kyung,Kim, Cheol Hyeon,Jin, Young-Woo,Lee, Seung-Sook,Shim, Sehwan Oxford University Press 2016 JOURNAL OF RADIATION RESEARCH Vol.57 No.3
<P>Radiation-induced lung injury (RILI) due to nuclear or radiological exposure remains difficult to treat because of insufficient clinical data. The goal of this study was to establish an appropriate and efficient minipig model and introduce a thoracic computed tomography (CT)-based method to measure the progression of RILI. Göttingen minipigs were allocated to control and irradiation groups. The most obvious changes in the CT images after irradiation were peribronchial opacification, interlobular septal thickening, and lung volume loss. Hounsfield units (HU) in the irradiation group reached a maximum level at 6 weeks and decreased thereafter, but remained higher than those of the control group. Both lung area and cardiac right lateral shift showed significant changes at 22 weeks post irradiation. The white blood cell (WBC) count, a marker of pneumonitis, increased and reached a maximum at 6 weeks in both peripheral blood and bronchial alveolar lavage fluid. Microscopic findings at 22 weeks post irradiation were characterized by widening of the interlobular septum, with dense fibrosis and an increase in the radiation dose–dependent fibrotic score. Our results also showed that WBC counts and microscopic findings were positively correlated with the three CT parameters. In conclusion, the minipig model can provide useful clinical data regarding RILI caused by the adverse effects of high-dose radiotherapy. Peribronchial opacification, interlobular septal thickening, and lung volume loss are three quantifiable CT parameters that can be used as a simple method for monitoring the progression of RILI.</P>
Sung, Chang Sup,Park, Sunhoo 한국경영과학회 2003 한국경영과학회 학술대회논문집 Vol.- No.1(1)
This paper considers a continuous-review two-echelon inventory control problem with one-toone replenishment policy incorporated and with lost sales allowed where demand arrives in a stationary Poisson process. The problem is formulated using METRIC-approximation in a combined approach of pricing and (S-1,S) inventory policy, for which an iterative solution algorithm is derived with respect to the corresponding one-warehouse multi-retailer supply chain. Specifically, decisions on retail pricing and warehouse inventory policies are made in integration to maximize total profit in the supply chain. The objective function of the model consists of sub-functions of revenue and cost (holding cost and penalty cost). To test the effectiveness and efficiency of the proposed algorithm, numerical experiments are performed. The computational results show that the proposed algorithm is efficient and derives quite good decisions.