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청량리 또는 ‘교외’와 ‘변두리’의 심상 공간 - 한국 근대문학이 재현한 동대문 밖과 청량리 근처 -
정선태 서울시립대학교 서울학연구소 2009 서울학연구 Vol.- No.36
In this essay I am supposed to consider how the image of Cheongnyangni is described in korean modern literature. During colonial period(1910-1945) Cheongnyangni was one of the well-known suburbs of Gyeongseong(Keizo), and literary writers such as Lee Gwang-Soo, Na Do-Hyang, Chae Man-Sik and Kim Gi- Rim wrote episode related with Cheongnyangni in their novels or essays. We can see the good example in Mujeong(The Pitilessness). And the image or imaginative place of Cheongnyangni, as we can see in Mujeong, is reproduced repeatedly in literary texts produced during colonial period. In literary texts Cheongnyangni is represented as the place of taking a walk, amusement and enjoyment. Especially the buddhist temples in and around Cheongnyangni such as Cheongnyang-sa, Yeongdo-sa are imaginated as the place of secret meetings or the place of depravity. These images are strengthened gradually and after all Cheongnyangni is regarded as the place of uncleanliness. But we should know that images are different from realities. The images of Cheongnyangni with which we are seemed to be familiar were formed, produced and circulated both historically and socially. In order not to be swayed by the negative images of the past we have to look into the process of image-making more deeply. And then we will embody new images based upon realities of Cheongnyangni.
특이섭동 기법 기반 제어 시스템에 대한 샘플링 영향 분석 및 개선 - 특이섭동 기법 기반 STT 미사일 디지털 자동조정장치 설계에의 적용
정선태,Jeong, Seon-Tae 대한전자공학회 2000 電子工學會論文誌-SC (System and control) Vol.37 No.3
특이섭동 기법을 이용한 제어 시스템의 설계가 가능하기 위해서는 무엇보다도, 빠른 동력학의 안정성이 중요하다. 그런데, 제어기의 디지털 구현으로 인하여, 이 빠른 동력학의 안정도가 영향을 받을 수 있다. 본 논문은 최근의 개발된 우수한 성능의 특이섭동 기반의 STT 자동조정장치(autopilot) 설계의 경우를 들어 이러한 특이섭동 기법에 기반하여 설계된 제어 시스템에 대한 샘플링 영향을 조사하고 개선된 제어기 설계의 예를 제시하여, 특이섭동 기반 제어 시스템 에 대한 샘플링 영향 분석의 필요성 및 유효성을 밝혔다. The guarantee of the fast dynamics stability is essential for successful application of singular Perturbation technique to control systems design. Even though the fast dynamics of the control systems is rendered stable by an analog controller, the fast dynamics stability of the control systems resulted from an digital implementation of the analog controller can be impaired severely. In this paper, we first investigate the time sampling effects on singular perturbation based control systems by centering on a design example of recently developed singular perturbation based STT missile autopilot with high performance. The investigation shows that the stability margin the fast dynamics of the STT misile autopilot system decreases rapidly as the sampling interval of discretizing the analog autopilot increases. Under this analysis, we propose a composite digital controller with compensation for the decreasing stability margin of the fast dynamics due to time sampling to achieve better performance with respect to sampling time. The improved performance of the proposed composite digital controller is verified by simulation. This result shows that one needs to investigate time sampling effects in the digital implementation of singular perturbation based controllder, and then can have benefit from the investigation.
NYAB 결정육성시 종자정의 방향이 성장외형 및 표면형상에 미치는 영향
정선태,최덕용 한국결정학회 1994 韓國結晶學會誌 Vol.5 No.2
K2O/3MOOS/0.SBB03 융제를 사용하여 TSSG 법으로 육성한 Md:Yal3(BO3)4 (NYAB) 단결정의 결정외형 및 표면형상을 연구하였다. <100>과 <120> 종자정을 사용한 경우는 서로 다른 크기의 프리즘 면들과 (101) 면들이 발달하였고 <001> 종자정을 사용하였을 때는 (001) 면이 함께 발달하였다. 종자정의 방향이 <100>또는 <120> 일때 프리즘 면 위에 성장구룽이 많이 형성되었으나, <001> 일때는 이웃하는 (101) 면에 평행한 줄무늬가 형성 되었다. (101) 면은 이차원 핵생성에 의한 성장이 지배적이고, <001> 종지정을 사용할 때 발달하는 (001) 면은 나선형 전위에 의한 성장이 지배적이었다. 종자정의 방향은 성장외형을 변화시키고 성장외형과 결정의 질을 결정하는 중요한 성장변수로 작용하였다. Growth form and surface morphology of NYAB single crystal grown by TSSG technique using a K2O/3MoOS/0.5B203 flux was investigated. In the crystal grown from <100> or <120> seed, prismatic and (101) faces were well developed with different size each other. (001) face was also developed in the crystal grown from <001> seed. While growth hillocks were observed on the prismatic face of the crystal grown from <100> seed, surface striations parallel to neighbor (101) faces were formed on that face of the crystal grown from <001> seed. The (101) faces were grown by two dimensional nucleation growth. (001) face which was developed at slow growth velocity of [001] direction was grown by screw dislocation Anisotropy of growth velocity as to seed orientation affected on crystal morphology and surface morphology.