2차원 고양력장치의 플랩 형상 및 위치 최적화

박영민,강형민,정진덕,이해창,Park, Youngmin,Kang, Hyoungmin,Chung, Jindeog,Lee, Hae-Chang 항공우주시스템공학회 2013 항공우주시스템공학회지 Vol.7 No.3

Numerical optimization of two dimensional high lift configuration was performed with flow solver and optimization method based on RSM(Response Surface Model). Navier-Stokes solver with Spalart-Allmaras turbulence model was selected for the simulation of highly complex and separated flows on the flap. For the simultaneous optimization of both flap shape and setting (gap/overlap), 10 design variables (eight variables for flap shape variation and two variables for flap setting) were chosen. In order to generate the response surface model, 128 experimental points were selected for 10 design variables. The objective function considering maximum lift coefficient, lift to drag ratio and lift coefficient at specific angle of attack was selected to reduce flow separation on the flap surface. The present method was applied to two dimensional fowler flap in landing configuration. After applying the present method, it was shown that the optimized high lift configuration had less flow separation on the flap surface and lift to drag ratio was suppressed over entire angle of attack range.

터보프롭 항공기의 프로펠러 파워효과 해석 및 보정

박영민,정진덕,Park, Youngmin,Chung, Jindeog 항공우주시스템공학회 2015 항공우주시스템공학회지 Vol.9 No.4

During the conceptual design of turboprop aircraft, the power effect driven from rotating propeller is typically obtained from empirical data. In the present paper, propeller power effect was obtained by using unsteady three-dimensional Navier-Stokes solver with $k-{\omega}$ turbulence model for the accurate prediction of turboprop aircraft performance. In order to simulate the relative motion between propeller and fuselage, unsteady sliding mesh method was used. During simulation, three flow conditions such as climb, cruise and descending flight were selected considering the flight envelop of the real turboprop aircraft. For the correction of aerodynamic coefficients, the thrust effect of engine exhaust gas was included based on the engine manufacturer's data. Using the computational results, the correction table for the aerodynamic coefficient of turboprop aircraft was suggested for the performance analysis of turboprop aircraft.

무선통신을 이용한 해상시뮬레이터 구현 연구

박영민 ( Youngmin Park ),임무성 ( Musung Lim ),이성석 ( Sungseok Lee ),이연우 ( Yeonwoo Lee ),김경호 ( Kyung-ho Kim ) 한국정보처리학회 2009 한국정보처리학회 학술대회논문집 Vol.16 No.1

본 논문에서는 해상무선통신시스템(Maritime Wireless Communication System)을 이용하여 Simulator를 구현하는 방식에 관해서 연구 하였다. VHF, CDMA, WiBro와 같이 3가지 무선통신 방식들에 대해서 해상 무선통신에 적용가능한지를 분석하고, Matlab의 GUI를 사용하여 구현된 해상무선통신방식 시뮬레이터를 바탕으로 해상무선통신 채널환경에서 무선통신방신에 대한 성능을 검증하는 시뮬레이션 프레임워크를 제시하였다. 현재까지 기본적으로 CDMA방식으로 무선통신방식 시뮬레이터를 구축하고, 추후 OFDM기반의 WiBro 전송방식에 대해서도 추가로 시뮬레이터를 설계하여 성능을 검증해 보겠다.

유근의 문예활동과 시세계 연구

박영민(Park Youngmin) 한국인물사연구소 2011 한국인물사연구 Vol.15 No.-

The period from the late 16th century to the early 17th century is a time in which excellent literary people performed much. The purpose of this study is to contemplate on the literacy activities and the poetry world of Guen Yoo who was in charge of the literacy spirit (文風) as a Daejaehak and Wonjeopsa. After walking into the path of a government official at the age of 24, Guen Y 00 is a government official and literary person who had experienced the political and social turbulent era for almost 50 years until he passed away at 79. In the 1590s during which the japanese Invasions of Korea in 1592 and 1597 occurred, he searched for ways to overcome the suffers from the wars as a Doseungji. After the japanese Invasions of Korea in 1592 and 1597, in 1600s, Guen Yoo was in charge of being responsible for the literacy spirit and diplomatic documents of joseon usually as an envoy, Wonjeopsa, and Munhyeong. Although it is important for an envoy or Wonjeopsa to jeondae at the diplomatic sites, it is also crucial to treat the other envoys and possess an ability as a literary person to send and receive poetry and prose. As an ambassador, Guen Yoo treated the Chinese envoys smoothly. He also sent and received the poetry and prose properly. Consequently, he became more renowned as a literacy person. In particular, it is notable that the poetry of the Wonjeopsa Guen Yoo's party was published as 『Dongbanghwaeum』in China in 1606. Guen Yoo, who had represented the diplomatic documents and literacy spirit of Joseon in the early 17th century as a Wonjeopsa, was evaluated as the one who formalized accompanying a Jesulgwan when greeting the Chinese envoys. When he was in the position of a Daejaehak, Guen Yoo was in charge of selecting poems of Joseon poets and completed publishing the poets into a 『Donginsibu』. Guen Yoo played a crucial role in writing official documents of diplomacy, advocacy, and the government not only in the 1600s but also in the 1610s.

QTP 무인기용 프로펠러의 하방추력 전산해석

박영민(Youngmin Park),최재훈(Jaehoon Choi),김철완(Cheolwan Kim) 한국항공우주학회 2019 한국항공우주학회 학술발표회 논문집 Vol.2019 No.11

채팅에서 언어 습관 자질을 이용한 화자 검증 시스템

박영민(Youngmin Park),서정연(Jungyun Seo) 한국HCI학회 2011 한국HCI학회 학술대회 Vol.2011 No.1

투사성과 재탐색을 이용한 결정적 한국어 의존구조 분석의 보정기법

박영민(Youngmin Park),서정연(Jungyun Seo) 한국인지과학회 2011 인지과학 Vol.22 No.4

본 논문에서는 투사성의 원칙을 이용해 결정적 한국어 의존 구문분석을 보완하는 방법을 제안한다. 우리는 결정적 의존 구문분석에 투사성의 원칙을 이용하여 의존 구문분석의 오류 를 찾아내고 투사성의 원칙을 만족하도록 수정하여 오류를 개선하였다. 제안하는 모델은 기 존의 결정적 의존 구문분석에 비해 높은 정확률을 제공하고 결정적 의존 구문분석의 장점 을 유지할 수 있다. 또한 우리는 중간 분석결과를 이용한 자질모델을 제안하였다. 우리는 실험을 통하여 제안한 의존 구문분석 모델이 기존의 의존 구문분석 모델들에 비해 성능이 향상됨을 보였다. In this paper, we propose a modified deterministic Korean dependency parser using a projectivity, The modified parser is improved by finding errors, such as cross dependency, from the original parsing results and correcting them according to the projecrivity and head-final principles. Our parser also uses parsing history information in addition to rich features, which only a deterministic algorithm can use. Results on the modified parser for ETRI(2006) corpus, that consists of complex sentences, show that our parser outperforms other parsers.

소규모 공동주거시설의 층간소음 정책 개선방안

박영민 ( Youngmin Park ),강광규 ( Kwangkyu Kang ),이병권 ( Byungkwon Lee ),김경민 ( Kyoungmin Kim ) 한국환경정책평가연구원 2018 수시연구보고서 Vol.2018 No.10

오늘날 실내 생활에서 삶의 질을 높이기 위해서는 실내 주거공간 환경을 편안하고 쾌적하게 유지해야 한다. 그러나 공동주택 거주율이 증가하고 개인 이기주의가 만연하면서 이웃간에 살인사건까지 발생하는 등 층간소음 문제는 이제 심각한 사회 문제로 대두하고 있다. 이와 같이 층간소음으로 인한 이웃 간 분쟁은 줄어들지 않고 계속해서 심각한 사회 문제가 되고 있지만 2014년부터 현재까지 층간소음 관련 정책 및 제도 개선은 미미한 수준이며, 주로 거주자 간 공동체의식 개선 등의 사후관리에 그치고 있다. 한편 정부는 100대 국정과제로 “층간소음 불편 요소 해소”를 반영하였고, 환경부는 2018년 주요업무 추진계획에 “생활 밀착형 소음진동 관리강화”의 일환으로 층간소음 관리에 관한 강화를 반영하였다. 이에 따라 해당 정책 현안 과제를 지원하기 위해 층간소음 분쟁 완화에 관한 수시 연구가 시급한 상황이다. 따라서 본 연구에서는 현행 공동주택 중심의 층간소음 정책의 한계를 개선하고자 2가구 이상의 소규모 공동주거시설을 대상으로 층간소음 예방을 위한 구조적 규제 개선방안을 제시하는 한편 각 지자체에서 적극적으로 참여할 수 있는 사후관리제도 개선방안을 제시하였다. Comfortable and pleasant indoor living environment is inevitable for indoor life quality. However, remarkably increased residential apartments and the number of self-interested people resulted in serious social problems including neighbourhood disputes and conflict. Thus, neighborhood disputes due to apartment noise exposure are not diminishing and continue to be a serious social problem. Up till now from 2014, apartment noise related policies and scheme have remained unchanged, and relevant policy is followed by post-management such as calling for improving community consciousness. Concerning the issue mentioned above, Korean government unveiled its effort to “relieve elimination disturbances of apartment noise” as one of the 100 Policy Tasks. The Ministry of the Environment reflected strengthening of apartment noise management as part of the "Strengthening life-friendly management about noise and vibration". Therefore, it is imperative to conduct research for mitigating the apartment noise disturbances in order to support the policy issues. Therefore, this study, with the purpose of improving current apartment noiserelated policy, proposes improving measures in structural regulation focused on the small-scale residential facilities so as to prevent apartment noise, and the post-management scheme that enables local government to play pivotal role.

멀티콥터 주변 유동장 수치해석

박영민(Youngmin Park),최재훈(Jaehun Choi),이융교(Yunggyo Lee) 한국항공우주학회 2017 한국항공우주학회 학술발표회 논문집 Vol.2017 No.4

샘플 홀드 회로를 이용한 초퍼 안정화 기법이 적용된 저잡음 증폭기

박영민(Youngmin Park),남민호(Minho Nam),조경록(Kyoungrok Cho) 대한전자공학회 2016 전자공학회논문지 Vol.53 No.10

본 논문은 초퍼 안정화기법을 적용한 저잡음 증폭기를 제안한다. 초퍼 안정화기법은 CMOS 증폭기의 저주파수 대역 오프셋과 플리커 잡음을 감소시키는 효과적인 기법이다. 기존의 초퍼 증폭기는 초퍼로 인해 발생되는 초핑 스파이크를 제거하기 위해 Low Pass Filter(LPF)를 사용하기 때문에 저항과 커패시터가 큰 면적을 차지한다는 단점을 가지고 있다. 제안된 초퍼 증폭기는 LPF 대신 샘플 앤 홀드 방식의 초핑 스파이크 제거 회로를 사용하여 적은 전압감쇄에서 36%, 면적에서 11%의 이득을 얻을 수 있다. This paper proposes a Low Noise Amplifier (LNA) with chopper stabilization technique with a sample-hold circuit. Chopper stabilization technique is effective in terms of reducing low frequency offset and flicker noise. Conventional chopper amplifier has a disadvantage in area because of using Low Pass Filter (LPF) for remove chopping spike. The proposed chopper amplifier employed sample and hold technique to decrease chopping spike instead of LPF that improves 36% in voltage damping and 11% in area.