ZnO를 이용한 은 나노와이어 히터의 열 안정성 향상

최원정,조성진,Choi, Wonjung,Jo, Sungjin 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.8

Transparent film heaters employing silver nanowires (Ag NWs) have attracted increasing attention because of their widespread applications. However, the low thermal resistance of Ag NWs limits the maximum operating temperature of the Ag NW film heater. In this study, Ag NW film heaters with high mechanical and thermal stability were successfully developed. The thermal power-out characteristics of the Ag NW heaters were investigated as a function of the Ag NW density. The results revealed that the prepared flexible Ag NW heater possessed high thermal stability over $190^{\circ}C$ owing to ZnO encapsulation. This indicates that the Ag NW film with excellent thermal stability have remarkably high potential for use as electrodes in film heaters operating at high temperatures.

금속 후면 반사막이 GaAs 태양전지의 효율에 미치는 영향

최원정(Wonjung Choi),김창주(Chang Zoo Kim),강호관(Ho Kwan Kang),조성진(Sungjin Jo) 한국태양광발전학회 2014 Current Photovoltaic Research Vol.2 No.2

To investigate the effect of metal back-reflective layers (MBLs) on the performance of GaAs solar cells, we fabricated GaAs solar cells on Al and Ag metal layers using the transfer printing technique. We also investigated the effect of MBL texturing on the performance of transfer printed GaAs solar cells. Transfer printed solar cells with MBLs exhibited improved photovoltaic performance compared to solar cells without MBLs due to light trapping. We demonstrated GaAs solar cells with MBLs on a flexible substrate and performed systematic bending tests. All the measured characteristics of solar cells showed little change in performance.

유전에 관한 모형구성활동에서 학생들의 인식론적 프레이밍 전환과 모형 정교화 탐색

최원정 ( Wonjung Choi ),하희수 ( Heesoo Ha ),김희백 ( Heui-baik Kim ) 한국생물교육학회 2021 생물교육 Vol.49 No.2

This study aimed to explore how shifts to productive framing and sophistication of models are facilitated in a modeling-based instruction in genetics. Fourteen students in four groups participated in modeling- based instruction in genetics, and this study focused on two groups whose practices clearly demonstrated shifts to productive framing. Interviews were conducted after the activity, and the students’ practices both in the activity and interviews were recorded and transcribed for the analysis. The analysis results revealed three contextual cues that facilitated shift to productive framing: (a) recognition of alternative models elicited from group members, (b) drawing justification through the question 'why', and (c) emphasis on participation in the knowledge building process. Two contextual cues that facilitated the sophistication of models were also identified: (a) evaluation of prior knowledge and replacement with the scientific knowledge through group discussion, and (b) using familiar phenomena to explain the target concept. This study contributes to the development of instructional strategies to help students productively engage in scientific modeling and increase their sophistication of models in genetics.

디지털 미디어 환경에서 KS 기본색명을 통해 인지되는 초점색의 속성 연구

최원정(Choi, WonJung),최경실(Choi, GyoungSil) 한국색채학회 2021 한국색채학회 논문집 Vol.35 No.4

Due to digital transformation, accurate color communication is required even in the digital media environment. Focal colors refer to colors of focal points in color categories, representing names of color. Therefore, the focal color can be used as a reference point for color communication even in the digital media environment. In this study, targeting 60 Korean females, focal colors that fall into KS basic color names have been investigated in digital color space and properties of those focal colors have been analyzed. The findings show that focal colors have perceptually outstanding characteristics with a high degree of chroma and lightness. In addition, the focal color derived through the digital color space showed a much higher chroma characteristic than previous studies using color swatches. There was a high level of agreement among subjects regarding hue of focal colors, while demonstrating a low level of agreement regarding chroma of focal colors. Moreover, distribution patterns of each focal color with basic color names varied in accordance with the color space of Yellow-Red, Green-Yellow, Blue-Green, and Red-Blue; in other words, each color space recognized according to basic color names showed different distribution patterns.

기후환경과 방송영상색채의 상관관계 연구

최원정(Wonjung Choi),최경실(Gyoungsil Choi) 한국색채학회 2011 한국색채학회 학술대회 Vol.2011 No.5

색채감성은 글로벌 시대의 마케팅 차별화 전략의 일환으로써 제품의 성패를 좌우하기도 한다. 현지 소비자들의 색채 선호 경향에 대한 이해를 바탕으로 적용되는 컬러마케팅의 활용분야는 패션, 제품뿐 아니라 영상분야까지 확대될 수 있다. 개인이나 집단별 색채감성의 차이는 지역, 민족, 연령, 성별, 소득, 교양수준등에 기인하는데, 본 연구에서는 자연 환경적 요인이 색채선호를 유발한다는 ‘색채기호의 지역설’에 근거해 지역별 기후환경과 방송영상색채의 상관관계에 대해 살펴보고자 한다. 연구를 통해 얻어진 지역별 영상색채 경향은 방송, 영화 및 영상 관련 업계의 해외 영상콘텐츠 제작시 응용될 수 있을 것으로 기대된다.

인지특성을 고려한 선호 재현색 연구

최원정(WonJung Choi),최경실(GyoungSil Choi) 한국색채학회 2014 한국색채학회 논문집 Vol.28 No.2

휴대성이 높은 스마트폰의 대중화로 스마트폰 카메라가 디지털 카메라를 대체하고 있는 가운데 카메라 기능은 스마트폰 선택의 중요한 기준이 되고 있다. 스마트폰 카메라를 이용한 촬영물은 스마트폰의 디스플레이를 통해 바로 확인하는 경향이 높기 때문에 화질 만족도는 매우 중요한 이슈가 된다. 따라서 이미지의 입출력 과정이 동시에 일어나는 스마트폰에 의해 생성된 소프트카피의 인지적인 화질 만족도를 향상시킬 필요가 있다. 선행 연구들에 의하면 사진의 수정과 감상에 있어 결정적인 역할을 하는 자연물의 기억색은 화질 만족도에 우선적으로 영향을 미치는 선호적 속성 중 하나이다. 또한 기기의 색재현력은 화질 선호도와 가장 상관관계가 높은 변수로 나타났다. 따라서 본 연구에서는 스마트폰 카메라를 통해 입력된 하늘색의 색자극이 디스플레이를 통해 출력되었을 때, 사용자의 인지적 특성 중 하늘에 대한 기억색이 하늘의 재현색 평가에 미치는 영향을 분석하였으며, 연구 결과는 다음과 같다. 첫째, 하늘에 대한 기억색은 실제색보다 명도가 높고, 채도가 높거나 동일한 특성을 보였다. 둘째, 하늘에 대한 기기의 재현색과 사용자의 기억색이 유사할수록 재현된 하늘색의 선호도가 높게 나타났다. 셋째, 실제색과 가장 유사한 색재현이 지각적으로 최적화된 색재현으로 평가되지는 않았다. 넷째, 현재 사용 중인 기기에서 경험된 하늘 재현색과 유사하게 재현된 하늘색 이미지에 대해 더 긍정적으로 반응했으며, 이는 반복적인 단순노출효과의 영향인 것으로 사료된다. 마지막으로 평가 도구로 사용된 3개의 스마트폰에서 입출력 과정을 거친 하늘 재현색에 대한 선호 차이는 유의미한 것으로 나타났다. The function of camera is becoming the important standard for the selection of smartphone amid the smartphone camera is replacing the digital camera due to the popularization of high portable smartphone. The level of satisfaction for the Image Quality is becoming the substantially important issue because the filming object using the smartphone camera has a high tendency to be identified rightly through the display of smartphone. Therefore, there is the necessity to improve the level of cognitive satisfaction for the Image Quality of soft copy created by the smartphone simultaneous with the input and output process. According to preceding studies, the memory color of natural object playing a decisive role in the correction and the appreciation of photograph is one of the preferential attributes effecting preferentially on the level of satisfaction for the Image Quality. Also, the color reproduction of equipment appeared to be the variable of highest correlation with the preference of Image Quality. Therefore, When the color stimulus of sky color pass through input-output process of smartphone, the effect of memory color for the sky of cognitive characteristic of users on the evaluation of reproduced color has been analyzed in this study, the study result is as follows: First, the memory color for the sky showed the characteristic of higher lightness and higher or equal saturation compared to the real color. Second, the preference of reproduced sky color appeared high as the reproduced color of equipment for the sky is similar to the memory color of user. Third, the most similar color reproduction to the real color is not evaluated to be the perceptually optimal color reproduction. Fourth, it reacted more positively for the sky color image reproduced similarly to the reproduced color experienced in the equipment in use currently; this is thought to be the repeated mere exposure effect. Finally, the difference of preference for the reproduced color of sky through the process of input and output in 3 smartphones used as the evaluation tool appeared to be significant.

언어 부호화를 통한 기억색의 색채 속성 연구 - 친숙한 자연물을 대상으로

최원정(Choi, WonJung),최경실(Choi, GyoungSil) 한국색채학회 2021 한국색채학회 논문집 Vol.35 No.2

Memory color is a color that is remembered in relation to a familiar object. According to previous studies, memory colors had a higher chroma and lightness than real object colors, and tended to change in the direction of the most impressive chromatic color. The purpose of this study was to investigate the colorimetric properties of the memory colors that were different from the real object color. A preliminary experiment and two main experiment were conducted with a total of 60 women in their 20s and 30s. Through a preliminary experiment, 10 natural objects representing 13 color names, including KS basic color names and sky blue, were selected. In this first experiment, the L, a, b values of the memory colors of 10 natural objects were investigated in a digital color space using a Photoshop color picker. In the second experiment, color names of 10 natural object were investigated by freely describing color names of the objects to be investigated. As a result, the lightness and chroma of the memory colors increased, and the hue tended to reinforce the chromatic color properties. The range of memory colors was reduced compared to the range of real object colors due to the influence of cognitive activity that memorizes the core color characteristics. On the other hand, memory colors of orange, earth and sky were more widely distributed than real object colors. They had a higher response rate to descriptive color names than other objects. It can be estimated whether the difference between object colors and memory colors is due to the mediator effect of focal colors. A focal color is a typical color that best represents a certain color category.

포스트모더니즘 영화의 색채사용 특성에 관한 연구

최원정(WonJung Choi),유연숙(YeonSook Yoo),최경실(GyougnSil Choi) 한국색채학회 2014 한국색채학회 논문집 Vol.28 No.1

영화는 ‘제7의 종합예술’로 공간적, 시간적 예술 요소를 동시에 구현하는 영상매체이다. 에이젠슈테인에 따르면 장면과 장면의 관계된 색채 차이에 따라 다양한 의미 발생이 가능하다. 따라서 영화 관객들은 단순한 이미지나 스토리 이외에 미장센의 색채 표현에 따라 차별화된 영화 이미지와 발생된 의미를 파악할 수 있다. 이에 본 연구는 관객의 능동적인 참여와 개입을 요구하는 포스트모더니즘 영화의 색채 특성에 대해 규명하기 위한 목적으로 수행되었다. 포스트모더니즘 영화 특성이 상당 부분 재현된 장-피에르 주네 감독의 주요 영화 장면들을 대상으로 포스트모더니즘 영화의 양식적 특성과 색채 특성을 분석하였으며, 연구 결과는 다음과 같다. 첫째, 주네 영화의 주요 장면들에서 현실의 지시성 부정, 내러티브의 중심성 부정, 장르의 획일화 부정, 시공간의 연속성 부정이라는 포스트모더니즘 영화의 양식적 특성이 나타났다. 둘째, 주네 영화의 주요 장면들에서 포스트모더니즘 영화 색채의 탈정형성과 장르 간, 시대사조 간, 매체 간 혼용성 그리고 특수 컬러필터에 의해 재구성된 색채 특성이 나타났다. 셋째, 주네 영화에서 전반적으로 사용된 색상은 R, Y, G계열이었으며, 초반 작품에 비해 후반 작품에서 사용된 색조 특성이 더 다양한 것으로 분석되었다. 넷째, 주네의 영화마다 Red와 Green의 보색대비 조화가 공통적으로 적용되어 일상적이지 않은 포스트모더니즘 영화의 비현실적 색채 특성을 표현하였다. The movie is the image media realizing the spatial, time art factor at the same time as ‘the seventh synthetic art. According to Eisenstein, the occurrence of various meaning is possible according to the scene and the related color change of scene. Accordingly, cinema audiences can grasp the differentiated image and the occurred meaning according to the color expression of Mise-en-Scene besides the simple image or the story. Hence, this study has been carried out for the purpose of examining the color characteristic of postmodernism movie demanding the active participation and intervention of audiences. The stylistic characteristic of postmodernism movie and the color characteristic have been analyzed targeting the major movie scene directed by Jean-Pierre Jeunet where the considerable part of characteristic of postmodernism movie is reappeared; the study result is as follows; First, the stylistic characteristic of postmodernism movie called the denial of real referentiality, the denial of centrality of narrative, the denial of uniformity of genre and the denial of time and spatial continuity appeared in major scenes of Jeunet movies. Second, the de-stereotype nature, the mixed use nature among genres, trends of times and media of postmodernism movie color and the recomposed color characteristic by the special color filter appeared in major scenes of Jeunet movies. Third, the color circle used in the movie of Jeunet generally was the line of R, Y, G, and the color characteristic used in the latter half of work has been analyzed to be more various compared with the earlier part of work. Fourth, the uncommon color characteristic of postmodernism movie has appeared as the harmony of complimentary contrast of Red and Green is applied in every movie of Jeunet commonly.

어린이 상해에 영향을 주는 조수석 에어백 설계 인자에 대한 연구

최원정(Wonjung Choi),김권희(Kwonhee Kim),고훈건(Hunkeon Ko),김동석(Dongseok Kim),손창규(Changkyu Son) 한국자동차공학회 2009 한국 자동차공학회논문집 Vol.17 No.1