열전대 센서와 압전체 구동기가 부착된 유량제어기의 DC 이득과 시상수를 이용한 제어에 대한 연구

이상경,김영수,Lee, Sang-Kyung,Kim, Young-Soo 한국기계가공학회 2004 한국기계가공학회지 Vol.3 No.1

This study was how to control the mass flow controller in gas supplying system. The flow controller consists of piezoelectric material and sensor with heating wire. It is difficult to obtain accurate model, because MFC was composed of many parts, and the relationship between input and output of controller is nonlinear. The model for control was obtained by time constant and DC gain Based on this model, PID controller was applied to flow controller using DSP board. Also, the results were compared to controller using system identification.

‘식민지 조선’의 맥락에서 읽은 인도 시인 사로지니 나이두

이상경(Lee, Sang-Kyung) 한국어문학회 2018 語文學 Vol.0 No.140

The Indian female poet Sarojini Naidu (1879∼1949) was introduced to colonial Joseon in the 1920s as a highly reputed Asian poet in the West along with Tagore, an Indian politician who led the Salt March with Gandhi in 1930. Due to the uniqueness of her association with Tagore and Gandhi—two prominent figures from India—Naidu rarely received much attention as a foreign female poet in colonial Joseon. However, since Naidu was introduced to Joseon after she had stopped writing and was more actively involved in political activities led by Gandhi, some regarded her as a poet, while others viewed her as a politician. This study highlights Naidu and her works, aiming to reveal the context in which emphasis is changed depending on time period, and attempts to build an integrated understanding of Sarojini Naidu. In the early 1920s, Kim Eok focused on poet Naidu, with a focus on her love poems. Then, in the mid 1920s, Naidu’s poetry was introduced as an example of sympathetic linguistic literature for oppressed people. Around 1930, Jeong, In-seop and Lee, Ha-yun regarded Naidu as more of a politician and introduced poems directly expressing the voice of Indian nationalism. The writers and poets of colonial Joseon felt an affinity for Naidu, who came from a colonized country herself, and used her works based on their own areas of interest. In India, Naidu’s literary and political activities are considered outdated. It is often said that her “aesthetics is feudal, although her politics is democratic nationalism.” Recently, it has been proposed that Naidu’s poems require reinterpretation as both a collusion with and resistance to colonialism. Her works are retrogressive in the use of India’s traditional customs and nature as subject matter but, at the same time, stem from a resistance to modern urbanization. Heo Jeong-suk, a socialist feminist who translated Naidu’s poems into the Korean language for readers in colonial Joseon, seemed to have been well aware of their contextual framing, that is, “a collusion with and resistance to colonialism.”

『대한신문(大韓新聞)』과 이인직

이상경(Lee, Sang-Kyung) 한국어문학회 2014 語文學 Vol.0 No.126

The present study seeks to elucidate the Daehan Sinmun (Korean Newspaper)’s contents through a source book (hereafter “excerpt collection”) transcribing editorials and some articles published in the daily from July 18, 1907 (first issue) to December 28, 1909 and to analyze the logic of journalists as represented by In-jik Yi (1862-1916). First, upon comparison between articles in the Daehan Maeil Sinbo (Korea Daily News) critical of the Daehan Sinmun and the excerpt collection, it was possible to confirm that the latter served as the original source for the collection of excerpts. Second, “A Song of the Righteous Armies Longing for Home” (Uibyeong Sahyang-ga) in the excerpt collection, a work that had sought to persuade members of the anti-Japanese righteous armies (uibyeong) to surrender, was similar in its logical structure to the speech made by Ong-nam Choe in the latter half of the novel The Silver World (Eunsegye) encouraging members of the righteous armies to capitulate.

신경회로망을 이용한 4차원 방사선치료에서의 조사 표적 움직임 예측

이상경,김용남,박경란,정경근,이창걸,이익재,성진실,최원훈,정윤선,박성호,Lee, Sang-Kyung,Kim, Yong-Nam,Park, Kyung-Ran,Jeong, Kyeong-Keun,Lee, Chang-Geol,Lee, Ik-Jae,Seong, Jin-Sil,Choi, Won-Hoon,Chung, Yoon-Sun,Park, Sung-Ho 한국의학물리학회 2009 의학물리 Vol.20 No.3

호흡으로 인한 방사선 치료 표적의 움직임을 고려함으로써 치료 성적 향상과 동시에 주변 장기 보호를 지향하는 4차원 방사선 치료의 구현, 성능 개선의 연구가 활발히 진행되고 있다. 환자가 자연스럽게 호흡하도록 하는 장점이 있는 호흡 동기방식이나 종양추적방식을 사용하는 경우, 방사선조사 표적의 움직임을 예측, 방사선조사 시 이를 보정하여 줌으로써 방사선치료 효과를 극대화할 수 있다. 신경회로망은 통계 수식에 의존하지 않고 주어진 자료를 표현하는 일종의 규칙을 찾아내므로, 방사선 치료 표적의 실시간 움직임과 같은 비선형성을 가진 시계열(Time Series)을 표현하는 데에 유리하다. 본 연구에서는 신경회로망 예측 알고리즘의 4차원 방사선치료에 적용 가능성을 평가하였다. Multi-layer Perceptron으로 신경회로망을 구성하였고 Scaled Conjugate Gradient 알고리즘을 신경회로망 학습 알고리즘으로 사용하였다. RPM 시스템을 이용하여 획득한 실제 임상 현장의 환자에 대한 호흡 자료를 기반으로 학습한 신경회로망 예측 결과를 RPM 시스템의 측정치와 상호 비교하였다. 10명의 환자에의 적용 결과, 신경회로망 학습에 사용된 자료가 환자의 호흡 범위 전체를 포함하지 않는 경우를 제외하고는, 최대절대오차 3 mm 미만의 우수한 예측 성능을 보였다. 학습 영역 이외의 호흡 자료 예측 시 발생하는 상당한 오차는 신경회로망의 외삽에 대한 학습능력 부족을 보이는 것으로, 오차의 원인을 제거하기 위한 일환으로, 호흡자료를 측정할 때 최대 호흡을 하도록 하여 충분한 학습 자료를 확보하는 방안을 고려해 볼 수있겠다. 4차원 방사선치료 시스템 성능 개선에의 직접 활용을 위하여, 다양한 시스템 대기시간에 따른 예측 성능 평가와 방사선 조사 장치와 연동, 실용 타당성 검증의 추가 연구가 진행될 것이다. Studies on target motion in 4-dimensional radiotherapy are being world-widely conducted to enhance treatment record and protection of normal organs. Prediction of tumor motion might be very useful and/or essential for especially free-breathing system during radiation delivery such as respiratory gating system and tumor tracking system. Neural network is powerful to express a time series with nonlinearity because its prediction algorithm is not governed by statistic formula but finds a rule of data expression. This study intended to assess applicability of neural network method to predict tumor motion in 4-dimensional radiotherapy. Scaled Conjugate Gradient algorithm was employed as a learning algorithm. Considering reparation data for 10 patients, prediction by the neural network algorithms was compared with the measurement by the real-time position management (RPM) system. The results showed that the neural network algorithm has the excellent accuracy of maximum absolute error smaller than 3 mm, except for the cases in which the maximum amplitude of respiration is over the range of respiration used in the learning process of neural network. It indicates the insufficient learning of the neural network for extrapolation. The problem could be solved by acquiring a full range of respiration before learning procedure. Further works are programmed to verify a feasibility of practical application for 4-dimensional treatment system, including prediction performance according to various system latency and irregular patterns of respiration.

그래핀을 이용한 전자소자 연구

이상경,김윤지,이병훈,Lee, Sang kyung,Kim, Yun Ji,Lee, Byoung Hun 한국진공학회 2016 진공 이야기 Vol.3 No.1

Although graphene has been considered as one of the promise materials for future logic devices due to extremely high mobility, its applications in electronics have been limited to a few cases such as a flexible interconnect, and RF devices. Furthermore, most of the studies on graphene devices reported unstable operations, claimed to be due to the poor quality of graphene. Nevertheless, recent studies showed that the electrical performance of graphene field effect transistor could be stabilized even with CVD graphene when well-established integration processes to control the interface of graphene were used. These results indicate that as in the case of silicon devices, a proper control of graphene interface is very important for the stable operation of graphene device as well as other 2D material based devices.

하중 혼합감도함수를 이용한 RTP 시스템의 $H^{\infty}$ 제어기 설계

이상경,김종해,오도창,박홍배,Lee, Sang-Kyung,Kim, Jong-Hae,Oh, Do-Chang,Park, Hong-Bae 대한전자공학회 1998 電子工學會論文誌, S Vol.s35 No.6

산업현장에서는 반도체 공정의 산화막(oxidation)과 소둔(annealing) 공정에서 생산성을 향상시키기 위해 기존의 확산로(furnace)보다 RTP(rapid thermal processing) 시스템을 많이 사용하고 있다. 이러한 RTP 시스템의 주요 제어대상은 정확한 웨이퍼(wafer)의 온도조절과 웨이퍼 내의 균일성이다. 본 논문에서는 RTP 시스템의 온도변화와 같은 외란에 대한 견실안정성 문제를 해결하기 위해 하중 혼합감도함수를 이용하여 $H^{\infty}$ 제어기를 설계하고, 온도추적 및 웨이퍼 내의 균일성 등의 견실성능 개선은 루프쉐이핑 방법을 이용한다. 온도에 따른 선형화된 모델은 차수문제로 인하여 실 시스템 구현시 제약조건이 있으므로 한켈(Hankel), 자승근 균형(square-root balanced) 및 슈어 균형(Schur balanced) 방법을 사용하여 모델 차수축소를 하여 제어기를 설계한다. 원래의 모델과 축소된 모델에 대해 성능을 비교하고 시뮬레이션을 통하여 설계한 제어기의 견실안정성과 성능을 확인한다. In industrial fields, RTP(rapid thermal processing) system is widely used for improving the oxidation and the annealing in semiconductor manufacturing process. The main control factors are temperature control of wafer and uniformity in the wafer. In this paper, we propose an $H^{\infty}$ controller design of RTP system satisfying robust stability and performance using weighted mixed sensitivity miniimization and loop shaping technique. And we need reduction technique because of the difficulty of implementation with the obtained high order controller for original model and reduced models, namely, Hankel, square-root balanced, and Schur balanced methods. An example is proposed to show the validity of the proposed method.

사회적지지가 대학생의 학습몰입, 전공만족도에 미치는 영향

이상경(Sang-Kyung Lee) 한국의료정보교육협회 2018 보건의료생명과학논문지 Vol.6 No.2

이 연구는 사회적지지가 대학생의 학습몰입, 전공만족도에 미치는 요인이 무엇인지를 조사하였다. 조사대상은 사립전문대학생 276명을 대상으로 설문조사하여 실시하였다. 자료 분석은 다중회귀분석을 통해 실시하였다. 분석결과를 보면 첫째, 성별이 ‘여자’이며, ‘취업전망이 매우밝다’, ‘학과선택 동기가 적성을 고려하여’ 라고 한 요인이 학습몰입도에 영향을 미치는 것으로 나타났다. 둘째, 전공만족도가 높은 대학생일수록 학습몰입도도 높아지는 정적관계의 영향이 있는 것으로 나타났다. 셋째, 사회적지지에서는 하위요인인 정보적-평가적지지가 높은 대학생일수록 학습몰입도가 높아지는 정적관계의 영향을 미치는 것으로 나타났다. 넷째, 전공만족도가 사회적지지 하위요인인 정보적-평가적지지보다 학습몰입도에 더 많은 영향을 미치는 것으로 나타났다. The study examined the effects of social support on the learning commitment of college students and the satisfaction of their major. A survey was conducted with 276 students of a private college.Multiple regression analysis was implemented for the data.The results of the analysis show as follows: First, those who are female, who have a thought of their bright job prospect, who choose their major for their aptitude, revealed a positive learning commitment. Second, those who have a higher degree of satisfaction on their major unfolded a higher degree of the learning commitment. Third, those who have a higher degree of information-evaluation support in the social support exhibited a higher degree of learning commitment. Fourth and lastly, college students' satisfaction of their major appeared to make more effect on the learning commitment than on information-evaluation support in the social support.

CNN 이용 시 분류정확도를 향상시키기 위한 건축이미지 검색 방법

이상현(Lee, Sang-Hyun),노녕(Lu, Ning) 대한건축학회 2020 대한건축학회논문집 Vol.36 No.9

This research proposes the method of using the Convolutional Neural Network (CNN) more efficiently in the classification of architectural images. The characteristics of images are not considered in the conventional methods of classifying architectural images. In this research, architectural images are first categorized primarily as two-dimensional images such as facades or three-dimensional images such as perspectives before classifying the types of the images. We compared the cases, where the types of architectural images are classified without being categorized as two- or three-dimensional images, with the cases where they are classified after the preliminary categorization is conducted. In this research, it was confirmed that the latter had higher classification accuracy. This implies that for image classification using the CNN, it could be effective to classify the types of architectural images after categorizing the basic preliminary delimitation based on characteristics of the images. We anticipate that the outcome of this research for architectural images will also apply to classification of other types of images.

대학생이 인지하는 부모와의 정서적인 관계가 학습몰입도와 전공만족도에 미치는 영향

이상경(Sang-Kyung Lee) 한국의료정보교육협회 2019 보건의료생명과학논문지 Vol.7 No.2

이 연구는 대학생이 지각하는 부모와의 정서적인 관계가 학습몰입도, 전공만족도에 미치는 요인이 무엇인지를 조사하였다. 조사대상은 사립전문대학생 218명을 대상으로 설문조사하여 실시하였다. 자료 분석은 다중회귀분석을 통해 실시하였다. 분석결과를 보면 첫째, 가정경제 수준이 ‘상’인 대학생, 본인의 취업전망이 ‘밝다’라고 응답한 대학생, 학과선택 동기가 ‘적성을 고려하여’ 선택한 대학생인 경우 학습몰입도에 차이가 나타났다. 둘째, ‘학년’, ‘가족형태’, ‘취업전망’, ‘학과선택 동기’, ‘학과선택 결정권자’ 요인에서 전공만족도에 차이가 나타났다. 셋째, ‘부모와 자녀의 친밀성’, 학과선택 동기, 경제수준, ‘부모와 자녀의 의사소통’, 본인의 취업전망이 ‘밝다’로 응답한 대학생인 경우 학습몰입도에 정(+)의 영향을 미치는 것으로 나타났다. 넷째, ‘부모-자녀의 친밀성’, 본인의 취업전망‘밝다’, ‘보통’, 학과선택결정권자 ‘본인’, 학과지원동기‘적성을 고려하여’, 학과지원동기를 ‘취업및진로’라고 응답한 대학생인 경우 전공만족도에 정(+)의 영향을 미치는 것으로 나타났다. This study examined how much the parents' emotional relationship influences learning concentration and study satisfaction by college students' perception. The subjects consisted of 218 students from a private college, and the study was conducted by a survey. Multiple regression analysis was implemented for the data analysis. The result showed as follows: First, the factors that the economic status is high, the job prospect is bright, the motivation of choosing the major is aptitude revealed a higher degree of learning concentration. Second, such factors as year, form of family, job prospect, motivation of choosing the major, who to choose the major exhibited a higher degree of study satisfaction. Third, close relationship between parents and student, motivation of choosing the major, high economic status, communication between parents and student, bright job prospect unfolded a positive influence on the learning concentration. Lastly, close relationship between parents and student, bright job prospect, their own decision on the major, career-oriented motivation of choosing the major showed a positive influence on their study satisfaction.

일제 말기의 여성 동원과 ‘군국(軍國)의 어머니’

이상경(Lee Sang-Kyung) 한국여성연구소 2002 페미니즘 연구 Vol.- No.2

여성과 민족 혹은 국가의 관계 문제는 구체적 상황을 바탕으로 조망해야하며, 특히 일제 시대 여성 문제의 경우 식민지라는 조건을 바탕으로 구명해야 한다. 일제가 식민지에서 시행한 여성 교육의 이념은 일본에서와 마찬가지로 ‘양처현모’였으나, 일본의 경우 여성도 국민이라는 것을 바탕으로 여성 참정권을 요구하거나 모성 보호를 요구하는 식으로 여성의 독자성을 추구해 나갈 수 있었던 반면에 식민지 조선에서 실시한 양처현모 교육은 탈정치화된 가족주의의 테두리에서 이루어졌다. 그 결과 일본이 여성을 전쟁에 동원하려고 했을 때 이미 국가에 포섭되어 있던 일본 여성들은 이에 적극 호응했을 뿐 아니라 이들을 군인으로 나라(천황)에 바친다는 생각도 국민의 어머니로서 당연한 의무로 자연스럽게 받아들였다. 그러나 일본과 역사적 전통이 다를 뿐 아니라 식민지 지배를 받으면서 공적 영역에 참여할 기회를 거의 가지지 못했던 조선 여성들은 전쟁 참여와 자식 희생에 매우 부정적이었다. 일제는 일본 여성들을 본받자는 운동을 전개하고 각종 선전물들을 쏟아 내었다. 식민지 조선에서 교육과 문필에 종사하던 일부 여성들은 이러한 전쟁 동원에 협력했다. 특히 당시 모성의 자리로 회귀하는 여성, 절대적인 존재에 자신을 던지는 여성상을 그리던 작가 최정희는 자식을 위해서 자신을 버리는 군국의 어머니를 그려내었다. 최정희에게서 여성 주체의식의 미약은 쉽게 식민주의와 전쟁에 협력하는 길을 밟게 했다. 그러나 최정희가 그린 군국의 어머니는 일제가 요구하는 바 ‘황국신민’으로서의 자각을 가진 양처현모이기보다는 ‘삼종지도’를 지키며 자식의 결정을 따르는 어머니였다는 점에서 전쟁 협력의 경우에도 일본과 식민지 조선의 여성은 그 차이를 드러내고 있다. 이처럼 식민지 여성의 ‘국가’에 대한 저항과 협력은 식민주의 본국에서의 여성의 저항과 협력과는 양상을 달리 하며, 식민지에서 여성적 자의식은 민족적 자의식과 배치되거나 모순되는 것이 아니라 오히려 서로를 상승시키거나 하강시키는 역할을 하고 있는 것이다. The problem of women and nationalism must be examined in its concrete reality, the colonial context. In drafting Korean men as Japanese soldier, the greatest obstacle that the Japanese imperial authorities faced was the familism of Korean mothers, who opposed the conscription of their sons. Because of dissimilarities in historical experience and the reality of women, the way in which women were mobilized in Japan, the metropolis, and Korea, its colony, differed. By exploring the reasons for such differences, this paper intends to explore the problem of women and nationalism in the colonial context. The ideology of "wise mothers and good wives," which the Japanese imperialists established as their principle in educating women, was applied differently in Japan and Korea. In Japan, this ideology was first selected as the cornerstone of women's education in 1890, in turn demanding and giving rise to the concept of 'militaristic mothers' amidst the ultranationalistic atmosphere of the First Sino-Japanese War(1894-1895) and the Russo-Japanese War. Also called "atarashii onna(new women)," members and readers of Seito―the first women's magazine published in Japan-created a sensation and drew much attention by opposing the idea of "wise mothers and good wives," which had been strengthened after the Russo-Japanese War, and by claiming women's uniqueness and autonomy. Subsequently, they demanded the suffrage of women not as the nation's wives or mothers but as citizens enjoying rights equal to those of men and, citing women's particularity as a reason, the state protection of motherhood. Indeed, mobilization held many different-and desirable-meanings to various groups of women. To "wise mothers and good wives." the war effort signified the honor of becoming 'militaristic mothers' ; suffragists, on the other hand, saw in the expanded chance for participation in the public arena a hope for women's suffrage; and those women demanding government protection of motherhood regarded the expansion of the role of the state as a sign of the ultimate realization of the welfare state. Made aware of their civic duties only in the last years of the Great Korean(Taehan) Empire, Korean women, on the other hand, could no longer call themselves "citizens" or pursue autonomy in the name of 'citizenry" because their country had been colonized. Conscious of themselves as both women and members of the Korean, most of the "new women" of Korea had actively participated in the March First Independence Movement (1919) but lacked a state that could actualize their unique demands such as those for suffrage and the protection of motherhood. Moreover, following annexation by Japan in 1910, the brand of education granted to women in Korea was based on the concepts of "wise mothers and good wives" and "wifely virtues," which did not go beyond familism. With the prolongation and expansion of the war, however, the Japanese imperialists likewise had to impose civic duties on Korean women, who hitherto had been confined to their families as 'wise mothers and good wives" and carefully controlled so as to prevent any unwanted surge of nationalistic sentiments. As far as Japanese women were concerned, the duty of raising and sacrificing their sons to the Imperial Army was neither novel nor special because the conscription system had been initiated from early on. Indeed, Japanese women were accustomed to the role of being "militaristic mothers" It was precisely in order to supplement the increasing shortage of manpower near the end of the war that the Japanese authorities legislated the Law for the Protection of Mothers and Sons and the National Eugenic Law: motherhood was being protected not for its own sake but for the birth and rearing of many healthy soldiers. Unlike their Japanese sisters, Korean women were not encouraged to be fertile. What the Japanese imperialists emphasized to colonial women in implementing voluntary enlistment in 1938 and, in