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가변풍량제어시스템과 냉복도밀폐시스템의 적용에 의한 데이터센터의 냉방에너지 절감 효과 분석
박병윤(Park Byung-Yoon),정용호(Jung Yong-Ho) 한국건축친환경설비학회 2013 한국건축친환경설비학회 논문집 Vol.7 No.3
In order to keep the data center server room temperature condition, cooling energy consumption has been rapidly increased as the increasing internal heat gain from the server devices. And the cooling units for server systems are fully operated to satisfy the indoor temperature condition, it results in the excessive energy consumption. There are many wastes of cooling energy which is caused by the structural problems in data center server room. For example, a leakage by the electric cable hole, mixing or recirculation of hot air from the hot aisle to the cold aisle, short circulation of the CRAC(Computer Room Air Conditioning), and others. So there are many strategies to reduce the waste of cooling energy in data center. In this study, cold aisle containment system and variable air volume system were proposed among the various strategies to reduce the energy cosumption. To verify the effectiveness of the energy saving system, test bed which is same with exist server room was set up in IDC(Internet Data Center) building and comparative experiments were carried out in actual conditions. As the result, in case of setting server room temperature 30℃, the server device inlet temperature exceeded 27℃ class 1 condition of the ASHRAE standard. But in case of setting server room temperature below 26℃, the range of inlet temperature of server system was 18~26℃ by cold aisle containment system. In case of variable air volume system and setting server room temperature 26℃, total energy saving was 19.8% to conventional cooling system. After all, variable air volume system and cold aisle containment system were proved to be the effective solution for energy saving cooling system.
전신마취하에 제왕절개술을 받는 전자간증 환자에서 마취유도 시 사용되는 Remifentanil이 산모와 신생아에 미치는 영향
박병윤 ( Byoung Yun Park ),유경연 ( Kyung Yeon Yoo ),이미경 ( Mi Kyoung Lee ),정철원 ( Cheol Won Jeong ),정성욱 ( Seong Wook Jeong ),정성수 ( Sung Su Chung ) 대한마취과학회 2009 Korean Journal of Anesthesiology Vol.57 No.1
Background: Endotracheal intubation elicits cardiovascular and arousal responses. The present study was aimed to determine whether remifentanil affects these responses in patients with preeclampsia. Methods: Thirty preeclamptic women who were scheduled to undergo cesarean delivery under general anesthesia were randomly assigned to receive either remifentanil 1 μg/kg (n=15) or saline (n=15) before induction of anesthesia. Systolic arterial pressure (SBP), heart rate (HR) and bispectral index (BIS) value as well as plasma catecholamine concentrations were measured. Neonatal effects were assessed using Apgar score and umbilical cord blood gas analysis. Results: Induction with thiopental caused a reduction in SBP and BIS (P<0.01) in both groups. Following the tracheal intubation SBP and HR increased in both groups, the magnitude of which was lower in the remifentanil group. BIS values also increased, of which magnitude did not differ between the groups. Norepinephrine concentrations increased significantly following the intubation in the control, while remained unaltered in the remifentanil group. The neonatal Apgar scores (5 min), and umbilical gas values were similar in the two groups except for higher incidence of Apgar score <7 at 1 min in the remifentanil group. Conclusions: Remifentanil 1 μg/kg effectively attenuates hemodynamic and catecholamine but not BIS responses to tracheal intubation in preeclamptic patients undergoing cesarean delivery. However, remifentanil may cause mild neonatal depression and thus should be used when adequate facilities for neonatal resuscitation are available. (Korean J Anesthesiol 2009; 57: 62~8)
영화 <수취인 불명>(2001)에 나타난 세대 간 전쟁기억의 전승과 이미지의 형상화 -집단기억과 세대이론을 중심으로-
박병윤 ( Byung Yun Park ) 한양대학교 현대영화연구소 2013 현대영화연구 Vol.9 No.2
Memories of the past events or experiences or to recall is the act of keeping. But remember, the meaning of the subject and in society in that it can be obtained, depending on the memory configuration is optional and can never be called, and the social context and the events of the past in various forms in accordance with the terms of the memory can be Maurice Halbwachs remember the “personal belongings but also popularly used as a symbol and a story that is stored, transmitted, and the product of the social means” looking into the autobiographical memory and historical memory, and looked at by dividing the collective memory, especially in war memories of the ‘collective memory’ as a country and member plays an important role in the formation of their identity, so many countries, the official history of the war gives special meaning to. From this point of view at the time of the war in 1950, South Korea Koreas happened across social changes, as well as brought to us to live the present influence is still being remembered. Of the division of Korea due to the war situation, rationalizing the national norm of violence that has been used is the most appropriate two euros. This war of the Republic of Korea, South Korea to form a collective memory, its influence continues to the present in that it is different from any other single country, South Korea and the unique atmosphere brings on national sentiment. After all the events of the past South Korea the war is not fixed, or the subject and the situation varies depending on the flow of time and the generations can be remembered. Korea War that the past 60 years, even today, we still have a division in the country to live and the collective memory of consciously or ever envision is muui. This ‘collective experience of war’ and ‘inter-generational tradition’ in terms of the Kim Ki-duk`s film <Address Unknown> U.S. base near the village in the 1970s against the backdrop of the war in the ‘survivors’ own experience and the collective memory of the war due to the lasting division and after that move on to the next generation, a tradition symbolizing the memory image of the enemy is shown. 20 years after the armistice generations years, flows through the years, but nonetheless still a remnant of war and the scars that remain have no qualms stalking the town of USFK military figure and from time to time to train fighters,gun,bow,such as day-to-day use of weapons of war became a long truce still, despite the war cloud passed, will remain the same anxiety appears visualization. Kim Ki-duk is also extremely special to remember the iconic image of the war between the generations been handed down generations and memories, or in the same generations stylized differences and conflicts naeeotda put the brutal images. Thus, this study comes from the Korea War division resulting in the formation of collective memory and tradition of intergenerational memory based on the theory of Karl Mannheim and this film <Address Unknown> symbolically, how to evaluate imaging hayeotneunjireul analysis.