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황동하(Dongha Hwang),정요한(Yohan Jung),백제현(Jehyun Baek),이동호(Rhee Dongho) 한국추진공학회 2008 한국추진공학회 학술대회논문집 Vol.2008 No.11
터빈의 익단 간극은 블레이드와 케이싱간 마찰을 줄이기 위한 중요한 부분이다. 수치 해석을 통해 익단 간극이 직접적으로 터빈에 미치는 영향을 판단하기 위하여 UTRC 터빈을 익단 간극이 있는 경우와 없는 경우로 나눠 계산을 수행하였다. CFX를 통해 도출된 해석결과는, 익단 간극이 있는 경우 생성된 와류가 터빈 전반에 걸친 손실을 일으키고 그 결과 익단 간극이 없는 터빈에 비해 더 낮은 전압효율을 보인다. Tip clearance is a critical point in turbine to reduce friction between blade and casing. To estimate the direct effectiveness of the tip clearance, numerically analyzed are flow passing through rotors with and without tip clearance. The Results by CFX tells that rotors with tip clearance have vortex structure which makes larger loss in turbine, and shows lower total-to-total efficiency than that without tip clearance.
냉전 초(1947~1953년) 소련 포스터에 나타난 ‘평화’ 이미지
황동하(Hwang, Dongha) 역사학회 2018 역사학보 Vol.0 No.238
This article examines how the Soviet Union used posters to depict the propaganda of peace. The primary material of this research consists of Soviet posters during 1947~1953. In this paper semiotic approach has been used to consider posters as signs. In these posters, the representative of the East fighting against the aggressive West was not a member of the political elite, but a worker – an anonymous figure emblematic of the first years of socialist construction. In contrast to the heroism of the socialist worker, the depiction of Western Europe consisted of asymmetrical compositions, derogatory and ironic images, which sought to accentuate the viewer’s negative emotions by inducing repulsion or amusement. The poster’s author sought to visually emphasize the powerful forces of nations eager for peace. They also represent the enemy in a belittling light in order to retain the frame of the superiority of the Soviet Union over its enemies. Accordingly, these posters became central to the articulation of a discourse legitimizing the Soviet ‘struggle for peace in all the world.’ The Image of peace in these posters was not primarily about the past, but was written into the Soviet narrative of progress. Here peace was not just about reconstruction, but about building the better future the Revolution had promised. Peace was not just the absence of war. It was the future that revolution was meant to bring. The concept of peace became a metonym for communism itself.