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항공기 개념설계를 위한 천음속 영역의 공력특성 예측에 관한 연구
전권수,김상진,이재우,변영환 건국대학교 산업기술연구원 2000 건국기술연구논문지 Vol.25 No.-
During the aircraft conceptual design phase, rapid aerodynamic analyses over various configurations are required. Hence, empirical and analytic techniques play important roles in estimating the aerodynamic characteristics. In this study, the aerodynamic characteristic estimation technique for transonic region based on empirical and analytical is developed. By comparing with the results of the wind tunnel experiment and existing prediction method, it is verified that the present method is accurate and useful.
구개결 언어에 대한 Screening test와 설문조사의 비교분석
임재석,권종진,장현석,박영준,최철민,전상호,장수정 大韓顎顔面成形再建外科學會 2001 Maxillofacial Plastic Reconstructive Surgery Vol.23 No.6
Purpose : This study was carried out to evaluate the abnormalites of the speeches of the cleft patients and compare the results of the speech evaluations of a speech pathologist with those of parents. Materials and Methods: Eleven cleft patients' parents were questioned about their children's speech and then the speeches of the cleft patients were evaluated by a speech pathologist and their results were compared with those of parents. Results : Nasal emission was noted in twenty percent of patients, with thirty percent demonstrating hypernasality and all demonstrating no hyponasality and aspirate. And twenty percent of patients show hoarseness. There was no statistically significant difference in the sensitivities to nasal emission between the speech pathologist and parents (p>0.05). However the speech pathologist is more sensitive to hypernasality than parents(p<0.05).
Kwon-Su JEON,Jae-Woo LEE,Yung-Hwan BYUN 한국산업응용수학회 2006 한국산업응용수학회 학술대회 논문집 Vol.1 No.2
In this study, repetitive response surface enhancement technique (RRSET) is proposed as a new system approximation method for the efficient multidisciplinary design and optimization (MDO). In order to represent the highly nonlinear behavior of the response with second order polynomials, RRSET introduces a design space transformation using stretching functions and repetitive response surface improvement. The tentative optimal point is repetitively included to the set of experimental points to better approximate the response surface of the system especially near the optimal point, hence a response surface with significantly improved accuracy can be generated with very small experimental points and system iterations. As a system optimizer, the simulated annealing, a global optimization algorithm is utilized. The proposed technique is applied to the several numerical examples, and demonstrates the validity and efficiency of the method. With its improved approximation accuracy, the RRSET can contribute to resolve large and complex system design problems under MDO environment.
Canard Rotor Wing 항공기의 로터 성능 최적화 연구
전권수(Kwon-Su Jeon),이재우(Jae-Woo Lee),변영환(Yung-Hwan Byun),유영훈(Yung H. Yu) 한국항공우주학회 2008 韓國航空宇宙學會誌 Vol.36 No.2
본 연구에서는 고정익과 회전익의 두 가지 모드로 운용되는 canard rotor wing(CRW) 항공기에 대한 사이징과 성능해석 프로그램이 개발되었다. 개발된 프로그램은 기존의 항공기 데이터를 이용하여 각 모드에 대한 검증을 수행하였고 정찰 임무형상에 대해 최적설계 문제를 정의하였다. canard rotor wing의 로터 최적화를 위해 고정익 모드와 회전익 모드에 대해 가중치를 이용한 다중목적함수를 구성하였다. 6개의 서로 다른 가중치와 설계제약조건에 대해 최적설계가 수행되었고 그 결과 개선된 로터형상을 도출하였다. In this study, the sizing and performance analysis program is developed for the canard rotor wing(CRW) aircraft which operates in dual modes (fixed wing mode and rotary wing mode). The developed program is verified for both fixed wing and rotary wing modes using the existing aircraft data and the design optimization formulation is made to perform the reconnaissance mission For the canard rotor wing aircraft optimization, multi-objective function is constructed to consider both the fixed wing mode and rotary wing mode the weighting factor. For six design cases with different weighting factors and different design constraints, the optimization is performed and improved rotor design results are derived.