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Al-Cu 합금의 일방향 응고조직과 기계적 성질에 미치는 냉간압연의 영향
오명환,나형용 ( Myung Hwan Oh,Hyong Yong Ra ) 한국주조공학회 1983 한국주조공학회지 Vol.3 No.1
The influence of columnar dendirtes on the mechanical properties of Al-1% Cu alloys as unifirectionalloy solidified under the conditions of controlled crystal growth rate (R) and temperature gradient (G) was investigated. And the change of metallography and mechanical properties when unifirectionalloy solidified alloys and cast alloys were cold-rolled from 10% to 90% in reduction ratio was studied. The results are as follows: 1. The elongation and yield strength of unifirectionalloy solidified alloy are higher then those of cast alloy, but there is a little decrease in ultimate tensile strength. 2. The metallography and mechanical properties are changeable with the primary arm spacings when the unidirectionalloy solidified alloys were cold-rolled from 10% to 90% in reduction ratio. An alloy with larger primary arm spacings was easily changeable in metallography and mechanical properties when it was cold-rolled. 3. The tensile strength of transversely cold-rolled to 90% in reduction ratio was higher then that of longitudionalloy cold-rolled to 90% in reduction ratio. In the case, the fractorgraphs of fractured surface showed that the cast alloy and the unifirectionalloy solidified alloy was ductile-fractured, but the surface of transversely cold-rolled to 90% reduction of unidirection alloy solidified was slip plane qracture.
A Frozen Time Receding Horizon Control for a Linear Discrete Time-Varying System
오명환,오준호,Oh, Myung-Hwan,Oh, Jun-Ho Institute of Control 2010 제어·로봇·시스템학회 논문지 Vol.16 No.2
In the case of a linear time-varying system, it is difficult to apply the conventional stability conditions of RHC (Receding Horizon Control) to real physical systems because of computational complexity comes from time-varying system and backward Riccati equation. Therefore, in this study, a frozen time RHC for a linear discrete time-varying system is proposed. Since the proposed control law is obtained by time-invariant Riccati equation solved by forward iterations at each control time, its stability can be ensured by matrix inequality condition and the stability condition based on horizon for a time-invariant system, and they can be applied to real physical systems effectively in comparison with the conventional RHC.
A Frozen Time Receding Horizon Control for a Linear Discrete Time-Varying System
Myung-Hwan Oh(오명환),Jun-Ho Oh(오준호) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.2
In the case of a linear time-varying system, it is difficult to apply the conventional stability conditions of RHC (Receding Horizon Control) to real physical systems because of computational complexity comes from time-varying system and backward Riccati equation. Therefore, in this study, a frozen time RHC for a linear discrete time-varying system is proposed. Since the proposed control law is obtained by time-invariant Riccati equation solved by forward iterations at each control time, its stability can be ensured by matrix inequality condition and the stability condition based on horizon for a time-invariant system, and they can be applied to real physical systems effectively in comparison with the conventional RHC.
방송전공 학생의 체험학습을 위한 방송박물관의 기능 활성화 연구
오명환(Myung Hwan Oh),임의택(Eui Taek Lim) 사이버커뮤니케이션학회 2009 사이버 커뮤니케이션 학보 Vol.26 No.1
본 논문의 연구 목적은 기존의 방송박물관과 차별화를 통하여 ‘전시와 관람’에 비중을 둔 과거형 방송박물관에서 나아가 살아있는 체험 공간으로써 정체성을 확립하는 것이다. 지식기반 사회, 정보화 시대의 방송박물관은 전문교육을 뒷받침하는 멀티 기능형 체험학습 공간으로 자리매김 되어야 할 것이다. 본 연구는 방송박물관 관람자들이 설비ㆍ전시물ㆍ콘텐츠 장르별로 방송 체험형 박물관을 어떻게 이용하는가를 살펴보았다. 152명의 방송 전공 학생들의 설문 조사를 통해 본 연구의 주요 분석 결과는 다음과 같다. 첫째, 가장 인상 깊었던 설비공간은 버추얼 스튜디오가 관심을 끄는 것으로 나타났다. 둘째, 향후 바람직한 박물관 형태로는 방송에 대한 직접 참여와 체험을 통한 학습공간의 필수성이 높은 것으로 나타났다. 셋째, 직접 체험 분야로는 방송카메라촬영과 방송편집 순으로 높게 나타났다. 넷째, 방송박물관에서 희망하는 수강 과목은 편집, 방송인 특강, 촬영 순으로 나타났다. 다섯째, 방송박물관에 바라는 사항으로는 방송에 대한 직접 체험 시설 및 공간 확충을 기대하고 있는 것으로 나타났다. 이 연구결과를 통해 현장성ㆍ직접성ㆍ체험성이 높은 전문적이고 종합적인 방송박물관이 가장 바람직한 것으로 나타났다. 즉, 방문자는 적극적인 이용자가 되고 관람자는 능동적인 체험자가 되어 창조적 활동을 지향하는 것으로 분석 되었으며, 이러한 연구결과가 갖는 이론적 함의를 논의하고 향후 방송전공학생의 체험학습을 위한 방송박물관 기능 활성화 개선을 위한 정책적 대안을 제시하였다. This study’s object is that through the distinction against the existed broadcasting museum, we established any identity as a live experience space derived from the past broadcasting museum, which is base on ‘Exhibition & Watching’. the broadcasting museum of knowledge based society and IT era should be established as the space for multi-functional experimental study supporting the professional education. I examined how the watchers of the broadcasting museum use the broadcasting experimental typed museum. The below analysis resulted from researching 152 students majored in the broadcasting survey. First, the most impressive space for some equipments is shown as virtual studio. Second, the desirable museum style should be high for the direct participation in the broadcasting and essential space for study. Third, shooting field for the broadcasting with camera and broadcasting edition are presented in order in the direct experimental field. Fourth, the desirable experimental field students want to join is shown as edition, lecture for the broadcasting related person and shooting in order. Fifth, broadcasting related persons are presented to expect their own space for the direct experimental space and establishment of their own spaces. Through the result of this study, professional and general broadcasting museum that high vivid, direct and experimental factors are shown. In other words, the visitors would be the affirmative users and the watcher would be the full-hearted experiencers to aim for the creational activity. Also, I discussed the theoretical meaning and suggested the alternatives based on the policy for activating the broadcasting museum function in experiencing the students’ experimental study, whose majors are broadcasting field in the future.
사무소건물 층수 증가에 따른 BIPV 발전량과 건물에너지소비량 저감에 관한 연구
오명환(Oh Myung-Hwan),윤종호(Yoon Jong-Ho),신우철(Shin Woo-Cheol) 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.4
BIPV system that can alternate building envelope by making materials of PV module should be considered in initial design step for applying PV system efficiently in office building. Meanwhile, area of the building skin also increases as the number of floors increases, but the valid area that can apply BIPV system in effect decreases relatively. Despite of this weak point, installing BIPV system is still being evaluated as the only measure left that can reduce electronic energy consumption in the building. Therefore, the impact on building energy consumption according to the increase of the number of floors when BIPV system is applied in the building was analyzed. And it will be used as basic information for application of BIPV in office building. conomic about application of BIPV is interpreted to be secured within the 10 story high. For over the 11 floors, the methods of increasing the contribution ratio produced by BIPV system through the optimization of install angle and increase in install area of south, high efficiency should be considered. The ways to reduce basic load by integrated design with another renewable energy besides BIPV should be found. Later, the study on the total building energy comsumption with PV generation according to the various type of the basic load and ratio of the width and depth will be performed based on this study.