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- 저자 : 박영민(Youngmin Park) (검색결과 138 건)
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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.
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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.
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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.
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자동차 사고로 인한 인적 손해에 있어서 손해배상의 범위
박영민(Park, YoungMin) 한양법학회 2011 漢陽法學 Vol.35 No.-
When casualty occurs due to traffic accident, the resultant damages are divided into active damages related to medical expenses and passive damages related to lost profits and mental damages related to compensation. The three factors for the lost profits, which constitute most part of compensation for damages, are the victim’s income, fault, and disabilities. So, in each of these three factors, the conflicts between the offender and the victim can become acute. This paper analyzes the existing precedents and theories on the income and the disabilities and presents the relevant criteria and alternatives. Income is determined by tax data and if it is not proved by tax data, statistical income, wages of technical workers are applied and when these also cannot be applied, wages of a day laborer of farming villages are applied. Accordingly, I examined through precedents what methods of proof are needed when income is to be proved by tax data, and what methods of proof are needed when income is to be proved in the case of statistical income and technical workers. Currently disabilities are evaluated by applying McBride methods which are considered most appropriate methods at present but have limitations of being unable to keep up with changes in the occupation clusters following the flow of the times and changes in medical technologies. So, new criteria by which modern occupational clusters and medical technologies can be reflected and the existing diverse methods of evaluating disabilities in integrated ways can be applied and the organizations that will practice the criteria need to be established. Compensation for casualties due to traffic accidents should be judged based on concrete validity, and the disputes over income and disabilities continue to exist as long as traffic accidents exist, and it is the tasks of judicial and medical circles to minimize such disputes by establishing more technically sophisticated and systematic criteria.
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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.
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실시간 사용자 프로파일을 반영한 상황인지 DVB 방송 추천 시스템
박영민(YoungMin Park),조성배(SungBae Cho) 한국정보과학회 2010 정보과학회 컴퓨팅의 실제 논문지 Vol.16 No.12
기존의 방송 추천 시스템은 사용자 프로파일 정보를 입력하고 이를 기반으로 콘텐츠 메타데이터와 일치되는 콘텐츠를 추천하는 형태로 연구가 진행되었다. 그러나 디지털 TV와 같이 사용자와의 상호동작이 많은 기기에서는 사용자들의 프로파일은 계속 변경이 일어나고 있고, 사용자의 의도와 프로파일을 정확히 파악하는 것이 추천의 정확도와 만족도를 높이는 것이다. 따라서 본 논문에서는 사용자의 리모컨 입력과 방송시청시간을 통해 실시간으로 사용자 프로파일 정보를 추출하고, 이 정보와 콘텐츠 메타데이터와 연관성을 파악하여 사용자에게 최적의 방송 콘텐츠를 추천한다. 또한 임베디드 시스템의 하드웨어 및 컴퓨팅 파워의 제약을 고려하여 네트워크 통신이나 상용 데이터베이스 시스템을 사용하지 않았고, 시청 시간에 따라 사용자가 원하는 콘텐츠의 장르가 다르다는 점을 고려하여 현재시간을 기준으로 콘텐츠를 추천하여 사용자 만족도를 증가시켰다. The previous study of Digital Broadcasting Recommendation system is based on user explicit profiling information. But user profile is always changing and the exact extraction of user profile is very important in recommendation system like Digital TV using many user interactions. This paper is studied of realtime user profiles aggregation through user remote controller input and matching this profiles with contents meta-data like contents genre information, event information ,content viewing time. It is not used commercial database system and network communication solution considering embedded system hardware restriction. And it is considered people want different content genre based on watching time. From the results of this paper, there are improvement of user satisfaction of contents recommendation.
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