다중 해상도 중심점 탐색법을 이용한 샥-하트만 센서용 상관관계법의 속도 개선

유재은,윤성기,Yoo, Jae-Eun,Youn, Sung-Kie 한국광학회 2008 한국광학회지 Vol.19 No.1

샥-하트만(Shack-Hartmann) 파면 측정 센서는 여러 분야에서 다양하게 사용되고 있다. 특히 적응광학은 주요 응용분야 중 하나이다. 적응광학 시스템은 실시간으로 빠르게 동작되어야 하므로 고속 파면 측정이 필수적이다. 고속 파면 측정에서는 카메라의 노출시간이 매우 작기 때문에 파면 측정시에 광자 잡음(photon noise)와 판독 잡음(readout noise)등의 잡음의 영향을 크게 받는다. 따라서 잡음에 둔감한 고속 중심점 탐색 알고리즘이 요구된다. 본 논문에서는 잡음에 둔감한 고속 중심점 탐색 알고리즘으로 다중 해상도 상관관계법이 제안되었다. 이 방법은 고속 푸리에 변환(fast Fourier transform)을 이용한 상관관계법과 비교하여 다중 해상도 이미지를 이용함으로써 계산시간을 향상시켰다. 본 논문에서는 무게중심법(center of mass method)과 상관관계법(correlation method)과 다중해상도 상관관계법(multi-resolution correlation method)의 계산시간과 측정 정확도를 비교하기 위해 전산모사 방법이 사용되었다. 제안된 방법의 정확도는 기존의 상관관계법과 유사한 것을 확인하였다. Shack-Hartmann sensors are widely employed as a wavefront measuring device in various applications. Adaptive optics is one of the major applications. Since an adaptive optics system should be operated in real-time, high-speed wavefront sensing is essential. In high-speed operation, integration time of an image detector is very short. In this case, noises such as readout noise and photon noise greatly influence the accuracy of wavefront sensing. Therefore a fast and noise-insensitive centroid finding algorithm is required for the real-time wavefront sensing. In this paper, the multi-resolution correlation method is proposed. By employing multi-resolution images, this method greatly reduces the computation time when compared to the fast Fourier transform (FFT) correlation method. The verification is performed through the computational simulation. In this paper, the center of mass method, correlation method and multi-resolution correlation method are employed to compare the measurement accuracy of the centroid finding algorithms. The accuracy of a Shack-Hartmann wavefront sensor using the proposed algorithm is proved to be comparable to that of the conventional correlation method.

편심측정 결과가 반영된 몬테카를로 시뮬레이션을 이용한 적외선 광학계 조립정렬 공차 할당 기법

유재은,Yoo, Jae-Eun 한국광학회 2011 한국광학회지 Vol.22 No.4

본 논문에서는 광학 민감도가 큰 IR 광학계의 조립정렬과정에서 목표 성능을 만족시키기 위한 조립정렬 허용범위를 설정하는 방법을 제시하였다. 조립정렬 과정에서 편심측정기를 이용하여 각각의 광학소자에 대한 반사 편심량을 측정할 수 있다. 측정된 값을 이용하여 몬테카를로 시뮬레이션을 수행하였고 이를 이용하여 조립 정렬 이후의 광학계의 성능을 예측하였다. 시뮬레이션 결과와 실제 제작된 광학계의 광학 성능을 비교하여 본 논문에서 제시한 공차 할당 기법의 타당성을 확인하였다. In this paper, a tolerance allocation method using Monte-Carlo simulation with measured reflective eccentricity for high-sensitive IR optics is proposed. During optics fabrication and alignment, reflective eccentricity was measured using an optical centration measurement instrument. A Monte-Carlo simulation was performed using measured eccentricity data, and it gives statistical estimated performance of the optics after fabrication. The validity of the proposed tolerance allocation method was verified comparing the estimated MTF result with the measured MTF result of the fabricated optics.

“You inside me inside you”:

Jae Eun Yoo(유재은) 한국외국어대학교 영미연구소 2018 영미연구 Vol.43 No.-

모신 하미드의 세 번째 소설,『라이징 아시아에서 더럽게 부자되기』(How to Get Filthy Rich in Rising Asia)는 풍자적인 제목에서도 알 수 있듯이 자기계발 문학의 패러디이며 그렇게 논의되어왔다. 다른 한편으로는 언어학자들과 서사학 자들은 소설이 2인칭 시점을 활용하는 독특한 방식에 주목한 바 있다. 이 논문은 소설의 2인칭 시점이 보편적인 자아를 비판적으로 재구성하며 특히 자아를 구성하기 위해 희생된 타자들에게 주목하는데 핵심적인 역할을 한다고 주장한 다. 나아가 소설의 독자를 서구에 위치시킴으로써 세계자본의 시대에 흔히 간과되는 복잡하면서도 폭넓은 관계들을 강조하는 양상을 논의한다. Moshin Hamid’s How to Get Filthy Rich in Rising Asia almost announces itself to be a parody of self-help literature and has been duly discussed as such. On the other hand, linguists and narratologists have been interested in the novel’s peculiar use of the second-person narration. I argue that the second-person narration is key to understanding the specific way How to Get Filthy Rich in Rising Asia undermines the popular understanding of the self and recognizes the others at whose expense the self is constructed. Furthermore, by positioning the reader as a Western person, Hamid brings to the fore the expansive and intricate relationships that are formed yet often neglected in the age of global capitalism.

초음파시험법에 의한 콘크리트의 강도 추정

유재은(Yoo, Jae-Eun),박송철(Park, Song-Chul),김민수(Kim, Min-Su),권영웅(Kwon, Young-Wung) 한국콘크리트학회 2004 한국콘크리트학회 학술대회 논문집 Vol.2004 No.11

Co-Ni 합금위에서 수직방향으로 정렬된 탄소나노튜브의 성장

柳在銀(Jae-Eun Yoo),李鐵眞(Cheol-Jin Lee),李泰宰(Tae-Jae Lee),孫權熙(Kwon-Hee Son),申東赫(Dong-Hyuk Shin) 대한전기학회 2000 전기학회논문지C Vol.49 No.8

트라우마를 수행하다 돈 드릴로의 서사실험 연구

유재은 ( Jae Eun Yoo ) 영미문학연구회 2012 안과 밖 Vol.0 No.33

Published in 2000, Don DeLillo``s The Body Artist is radically different from his previous works in its theme and scope. Instead of offering a panoramic overview of the effects of global capitalism, the short novel probes in to the traumatized mind of a body artist. In The Body Artist DeLillo experiments with the narrative from as it performs, rather than heals, the trauma. As a result, the reader is in vited to participate in the portagonist``s gradual recognition of her self as irreversibly damaged by the loss of the loved other. This new way of perceiving the self is important as it leads to the realization of the Self that is vulnerable to, and thus open to, the Other. Thus conceived, this self-other relationship also opens the possibility of re-reading the past and forming a less self-centered future. This is a possibility Delillo explores in Falling Man while dealing with 9?11, a national trauma of the U.S. In the novel, DeLillo counteracts the patriotic and oversimplified representations of 9?11 which have contributed to the totalitarian turn of the Bush administration. Extending the formal experiment of performing trauma on the level of narrative, Falling Man forces the reader to face the naked moment of the catastrophe.However, Falling man forces the reader to face the naked moment of the catastrophe. However, Falling Man stops short of imagining a different kind of a national self, as it fails to confront the complex causes and outcomes of the terror attack.

"잊혀진 전쟁"과 세계화를 넘어: 폴 윤의 『원스 더 쇼어』에 나타난 역사와 소통

유재은 ( Jae Eun Yoo ) 미국소설학회(구 한국호손학회) 2011 미국소설 Vol.18 No.3

The publication of Paul Yoon`s first book, Once the Shore, heralded the arrival of a remarkable new voice in the Korean American literature scene. This essay examines the unique manner in which this collection of short stories "re-presents" the traumatic modern history of Korea. On an imaginary Korean island where Once the Shore is set, the memory of the violent Korean past Japanese imperialism, World War II, American military occupation, the Korean War, etc. is all but lost. In the story "Once the Shore," this historical amnesia, along with American imperialism and global tourism, alienate the traumatized main characters from each other. Despite their complete difference, however, they manage to show kindness to each other, which leads to significant moments of ethical communication. This unconventional form of communication disrupts the conventional boundaries created by nationality and ethnicity, while prompting a re-evaluation and re-interpretation of the past and present. Thus exploring the impact of foreign mostly American power on an isolated yet global space, Yoon sets the trauma of Korean history in the international context, and seeks to resolve it through transnational connections between different individuals. Even though a complete and transparent understanding of each other is rendered impossible, the acts of kindness to the human Other begin the process of remembering and healing.

초음파시험법에 의한 고강도 콘크리트의 강도 추정식

유재은(Yoo Jae-Eun),박송철(Park Song-chul),김민수(Kim Min-Su),권영웅(Kwon Young-Wung) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-

본 연구에서는 초음파 시험법에 의한 고강도 콘크리트의 새로운 강도추정식을 제안하고자 한다. 고강도 콘크리트의 강도 추정식은 크게 부족할 뿐 아니라, 시험에 소요되는 비용이나 속도, 시험의 연의성, 구조체의 손상, 신뢰성 등에 있어서 저마다의 문제점을 가지고 있는 실정이다. 본 연구를 통해서, 콘크리트 재령 730 일 이내에서의 콘크리트 구조체에 대한 초음파 시험으로부터 희귀분석을 통하여 얻은 새로운 고강도 콘크리트의 강도추정식은 다음과 같다. Linear : fck=5884Vp-175.80(r²=84.0%) Quadratic : fck=-99.65Vp²+841.49Vp-1708.57(r²=91.3%) 여기서, 싸 콘크리트 압축강도 추정식 (MPa) Vp 초옹파속도 (by km/sec) This study concerns the new strength equations of high strength concrete by ultrasonic pulse velocity test There are not only few estimate strength equations of concrete by ultrasonic pulse velocity test. but also many problems to apply them because of time, cost, easiness, structural damage, reliability and so on For this study, there performed a series of test and proposed equations as follows; Linear : fck=5884Vp-175.80(r²=84.0%) Quadratic : fck=-99.65Vp²+841.49Vp-1708.57(r²=91.3%) here, fck Estimated compressive strength of concrete by MPa Vp Ultrasonic Pulse Velocity of concrete by km/sec

패션쇼 스테이지에서의 화예디자인에 관한 연구 -게슈탈트의 시지각 원리 이론을 중심으로-

유재은 ( Jae Eun Yoo ) 한국화예디자인학회 2011 한국화예디자인학 연구 Vol.24 No.-

This study is about relationship between the Floral art & design and the Fashion Show Stages. It aims to set the fundament for the expansion of the scope of our activities and advancement of contemporary Floral art & design field as display design elements for Fashion show stages through existing case analysis based on visual perception principles of Gestalt. The results, coming from this article are as follows. First, the visual perception principles of Gestalt is widely used as the visual basic factor of display design of stages and the typology of systematic expression. Second, applying the Floral art & design could invent discriminative fashion show stages, and using natural materials provides sufficient aesthetic value as the medium that communicates with audiences and achieves show`s goal. Lastly, the floral field needs fresh expression techniques along with the flow of time. Therefore, the principles become the ground rules that make current artistic creative work, and it render assistance to new spacial expression with efficiency and economics. When both fashion show and floral art & design that have something one-off and extemporaneous in common affect positive, it will generate a significant synergy effect. With this, the present study expects to offer new possibility in the future.

초음파시험법에 의한 고강도 콘크리트의 강도 추정식

유재은 ( Yoo Jae-eun ),박송철 ( Park Song-chul ),김민수 ( Kim Min-su ),권영웅 ( Kwon Young-wung ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.2

본 연구에서는 초음파 시험법에 의한 고강도 콘크리트의 새로운 강도추정식을 제안하고자 한다. 고강도 콘크리트의 강도 추정식은 크게 부족할 뿐 아니라, 시험에 소요되는 비용이나 속도, 시험의 편의성, 구조체의 손상, 신뢰성 등에 있어서 저마다의 문제점을 가지고 있는 실정이다. 본 연구를 통해서, 콘크리트 재령 730일 이내에서의 콘크리트 구조체에 대한 초음파 시험으로부터 회귀분석을 통하여 얻은 새로운 고강도 콘크리트의 강도추정식은 다음과 같다. Linear : f_ck = 58.84Vp - 175.80 (r²=84.0%) Quadratic : f_ck = -99.65Vp² + 841.49Vp - 1708.57 (r²=91.3%) 여기서,f_ck : 콘크리트 압축강도 추정식(MPa) Vp : 초음파속도(by km/sec) This study concerns the new strength equations of high strength concrete by ultrasonic pulse velocity test. There are not only few estimate strength equations of concrete by ultrasonic pulse velocity test, but also many problems to apply them because of time, cost, easiness, structural damage, reliability and so on. For this study, there performed a series of test and proposed equations as follows ; Linear : f_ck = 58.84Vp - 175.80 (r²=84.0%) Quadratic : f_ck = -99.65Vp² + 841.49Vp - 1708.57 (r²=91.3%) here, f_ck : Estimated compressive strength of concrete by MPa Vp : Ultrasonic Pulse Velocity of concrete by km/sec