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장진만 ( Jin-man Chang ),이진주 ( Jin-ju Lee ),서승범 ( Seung-bum Seo ),오승진 ( Seung-jin Oh ),오민아 ( Min-ah Oh ),문소영 ( So-young Moon ),이재영 ( Jai-young Lee ) 한국폐기물자원순환학회(구 한국폐기물학회) 2020 한국폐기물자원순환학회 추계학술발표논문집 Vol.2020 No.-
매립이 완료된 매립지를 관리하는데 있어 매립지의 장기 침하예측은 필수적이다. 침하 예측을 정확히 하지 못할 경우 시설물에 균열 등의 안전과 경제성에 문제가 발생할 수 있다. 매립지에서의 지반침하는 폐기물의 분해, 침출수의 발생, 복토재의 하중, 불균질성과 이방성 등 다양한 영향 인자를 자지며, 그 관계 또한 매우 복잡하다. 인공신경망은 일종의 회귀분석 모델로 입력된 데이터로부터 일정한 패턴을 학습하여 새로운 데이터에 대한 답을 예측하게 된다. 이로 인해 인공신경망은 변수 간 복잡한 비선형 관계의 표현이 가능하며, 변수 간의 상관관계의 학습이 가능하다. 최근 인공신경망을 활용한 주가 예측, 미세먼지 예측 등 환경 분야에서 응용이 증가하는 추세이다. 따라서 본 연구에서는 매립이 종료된 폐기물 매립지의 침하 데이터를 이용하여 인공신경망을 학습시키고 학습시킨 모델을 이용하여 해당 매립지의 침하를 예측하고자 하였다. 연구 지역은 수도권매립지 제1매립장의 침하데이터를 이용하였고, Tensorflow 2.3을 이용하여 모델링을 진행하였다. 예측력이 가장 뛰어난 모델을 선정하기 위하여 은닉층 수와, 뉴런의 수, 최적화 알고리즘, 오차함수, 학습률과 드롭아웃 비율을 변경하여 모델을 훈련시켰다. 최적의 모델은 3개의 GRU 은닉층으로 구성되어 있으며 각층마다 뉴런은 64, 32, 16개를 가진다. 손실함수는 MSLE를 사용했으며, 최적화 알고리즘은 Adam, 드롭아웃 비율은 0.2, 학습율은 0.01로 설정하였다.
연구논문 : 초등 과학 교과전담 교사의 실험수업에서 형성되는 사회문화적 맥락의 특징 -사회문화적 요인 및 요인들 간 상호작용을 중심으로
장진아 ( Jin A Chang ),박지선 ( Park Ji Sun ),송진웅 ( Jin Woong Song ) 한국초등과학교육학회 2014 초등과학교육 Vol.33 No.2
This study explores the features of sociocultural context of experiment classes taught by a science subject teacher. Two experiment classes on electric circuit for fifth graders were observed and video recorded. The data was also collected through student interviews and teacher interviews. Using the cultural historical activity theory, we extracted the six sociocultural factors and analyzed their interactions. This study could identify that four features of the sociocultural context of the cases. First, the rules of science classes were not decided by the teacher, but formed and modified through the negotiation between the teacher and students or between the students. Second, elementary students played a game, i.e. ‘Countdown game’, during their electricity experiments, which had both positive and negative influences on science learning. Third, the science teacher feels a limit on life guidance because of the position as a subject teacher in an elementary school. Lastly, although the science teacher had enough time to prepare science classes, there was no guarantee of the improvement of teaching quality. Based on the results of this study, educational implications are discussed in terms of teaching science experiments and of the science subject teacher system.
장진미(Jin Mi Chang),우나리야(Nariyah Woo) 한국인체미용예술학회 2010 한국인체미용예술학회지 Vol.11 No.4
The art makeup is most shown dynamically the inner image breaking away from standardized formality of current makeup. In addition, it is a realm of beauty which decorates the body without material limit and shows the individual self. The fantasia makeup among them is more diversified of the expression characteristic by emergence of new art trend called futurism and is developed to complex image pattern. In this study, the expression characteristic of futurism is investigated detailed by the examples in relation to the futurism which is shown at the fantasia makeup of one type of expression pattern in art makeup. It can be thought that the expression characteristic of futurism is classified into utopian futurism and dystopian futurism. The utopian futurism is shown the desire about future of human. By contrast with this, the dystopian futurism is shown the anxiety about future of human. The doubly characteristic of futurism in this is shown to highly varied expression style at the fantasia makeup. It can be said that the utopian futurism is expressed as the play instinct and folksy character. It is shown the natural expression trend of escaping consciousness from environment of side effects in the rapidly changing scientific civilization. Besides, it is shown the image which is more intent to human and nature compromising with humanity and mechanical beauty. In contrast, it can be said that the dystopian futurism is expressed as the cyberpunk and decadent character. It is shown the negative imagination in anticipation of unusual fantasy realm to the human future contained of opposing culture which is a material omnipotence, identity loss and human alienation and so on.
두 가지 촉매를 이용한 가교된 무색투명 폴리이미드 필름의 물성 비교
장진해(Jin-Hae Chang) 한국고분자학회 2017 폴리머 Vol.41 No.6
가교 반응이 가능한 2중 결합을 갖는 bicyclo(2,2,2)oct-7-ene-2,3,5,6-tetracarboxylic-dianhydride(BCD)와 bis[4-(3-aminophenoxy)phenyl] sulfone(BAPS)을 N,N-dimethylacetamide(DMAc)에서 반응하여 폴리아믹산(poly(amic acid), PAA)을 얻었다. PAA에 두 가지 촉매를 각각 0~0.10 wt%씩 첨가하고 열처리하여 가교된 무색 투명한 폴리이미드(colorless and transpatrent polyimide, CPI)를 합성하였다. 촉매의 양에 따라 가교된 폴리이미드의 열적 성질, 가교도, 광학적 특성을 조사하였으며, α,α"-azobisisobutyronitrile(AIBN)과 Grubb’s의 두 가지 촉매의 종류에 따른 물성을 서로 비교하였다. 두 가지 촉매가 첨가된 CPI의 물성은 촉매 없는 순수한 CPI보다 열적 성질은 더 증가하였으나 광학적 성질은 오히려 감소하였으며, 두 가지 촉매를 사용하여 얻은 CPI의 열적 성질과 광학적 투명성은 서로 큰 차이가 없었다. A poly(amic acid) (PAA) was prepared by the reaction of bicyclo(2,2,2)oct-7-ene-2,3,5,6-tetracarboxylicdianhydride (BCD), containing double bonds for crosslinking, and bis[4-(3-aminophenoxy)phenyl] sulfone (BAPS) in N,N-dimethylacetamide (DMAc). The PAAs were heat-treated with two different catalysts, α,α"-azobisisobutyronitrile (AIBN) and Grubb’s catalyst, as crosslinking agents to create crosslinked, colorless, and transparent polyimide (CPI) films. The thermal properties, degree of crosslinking, and optical transparency of the CPI were investigated by increasing the catalyst content from 0 to 0.10 wt%. We also tried to clarify the catalytic effects of the two catalysts (AIBN and Grubb’s) on CPI films. The CPI film with the catalyst had better thermal property than pure CPI; in contrast, the addition of the catalyst to the CPI film was found to deteriorate the optical property. The thermal property and optical transparency of the CPI films with two different catalysts were found to be almost similar.