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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.
재실자의 시쾌적과 건물에너지성능을 고려한 슬랫형 블라인드 자동제어전략
오명환(Oh, Myung-Hwan),윤종호(Yoon, Jong-Ho),신우철(Shin, U-Cheol) 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.11
Glass Envelope is vulnerable to insulation performance and controling solar radiation. Insulation performance is consistently improving these days due to recent building energy saving policy in South Korea. However, solar control at glass envelope is still limited to meeting requirements of ideal high performance. Generally, Inside Blind plays an important role of solar controlinstead of glass which have a characteristics of transmitted solar.Unfortunately, most of them are controled by occupants and which method is not resonable in building energy. Therefore, achieving the high efficient performance building, automated control blind system considering reduction of building loads have to be adopted. Furthermore, considering occupants visual comport about removing discomfort glare is also essential.