창호 에너지 소비 효율 등급제와 건물 에너지 소비의 상관관계 분석

곽희정(Hee-Jeong Kwak),장향인(Hyang-In Jang),이현수(Hyun-Soo Lee),엄재용(Jae-Yong Eom),서승직(Seung-Jik Suh) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.6

The purpose of this study is to analyze the correlation between the ‘Fenestration Energy Consumption Efficiency Rating System’ (hereafter referred to as FECERS) and building energy consumption. ‘EnergyPlus’ was used for the calculation of energy consumption in apartments and office buildings, according to FECERS’s rating and SHGC. The result indicates that the FECERS has high correlation with apartments, but has low correlation with office buildings. Also, it indicates that office buildings have a large impact from SHGC, which is not reflected in the FECERS. Consequently, the FECERS needs to be improved, by adding optical properties to assessment items. Additional study is required to establish the fenestration rating system, which, on the basis of this work, has high relevance to building energy consumption.

한국사 수업에서 공평교수의 실천방안

곽희정(Kwak, Hee jeong) 학습자중심교과교육학회 2020 학습자중심교과교육연구 Vol.20 No.14

본 연구는 한국어가 서툴고 한국사에 대한 배경지식이 부족한 중도입국청소년에게 한국사를 어떻게 가르칠 것인가에 관한 교수전략을 탐색해 보는데 그 목적이 있다. 이를 위해 다문화교육의 중요한 철학적 기반인 공평교수(Equity Pedagogy)에 주목하였고, 한국사 수업에서 공평교수를 실천하는 방안을 교수 기술적 측면, 교수 내용적 측면, 교수 구성적 측면인 세 가지 측면에서 탐색해 보았다. 아울러 한국사 수업에서 공평교수를 실천하는 수업 설계방안으로 모국문화와 연계한 내러티브 수업을 제안하였다. 모국문화와 연계한 내러티브 수업은 낮은 한국어 실력으로 인해서 한국사 학습에 어려움을 느끼는 중도입국청소년에게 유용한 수업 방안이다. 본 연구는 다문화배경 학생의 급격한 증가에도 불구하고, 여전히 낯선 학습자인 중도입국청소년에 주목하여 이들의 현실과 요구를 반영한 교수전략을 탐색한 점에 의의가 있다. 향후 중도입국청소년을 포함한 다양한 배경의 소수학습자들을 위한 한국사 교수전략이 더욱 활발하게 논의될 수 있기를 바란다. This study aims to explore the strategies for teaching Korean history to immigrant adolescents with the theoretical basis of equity pedagogy, which is the key philosophical concept in the field of multicultural education. The significance of this study is as follows. First, there is significance in suggesting a study on teaching strategies that can aid practical classroom lessons when there is little to no discussion on Korean history education for students from multicultural background. Second, there is significance in exploring teaching strategies that reflect the realities and needs of immigrant adolescents by focusing on the students themselves, who are still unfamiliar learners, despite the rapid increase in the number of students from multicultural backgrounds. This study will suggest new implications in the field of history education research for minority learners in terms of ethnicity, language, and social economy.

창호 에너지 소비 효율 등급에 따른 건물 에너지 사용량 비교

곽희정(Hee-Jeong Kwak),장향인(Hyang-In Jang),이창연(Chang-Yeon Lee),서승직(Seung-Jik Suh) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.11

This work is intended to analyze how “Fenestration Energy Performance Rating System” affects building energy consumption, investigate the problems of the rating system and propose a direction for improving the system. This research was used the building energy calculation program EnergyPlus to investigate energy consumption of office building. In this work, the analysis case was established on the basis of window-to-wall ratio, thermal transmittance coefficient, Airtightness, and SHGC. And, heating and cooling energy and total energy consumption were compared. According to the comparison analysis, in the case of office building that has a high rate of daytime use, Fenestration Grade was inversely proportional to cooling load, so that the correlation between the rating system and the total energy consumption was low.

ISO 13790의 Monthly method 에너지 요구량 계산에서 열 획득 이용률 산정방법에 관한 연구

곽희정(Kwak, Hee-Jeong),신현국(Shin, Hyun-Gook),조재훈(Jo, Jae-Hun),서승직(Suh, Seung-Jik) 한국건축친환경설비학회 2012 한국건축친환경설비학회 학술발표대회 논문집 Vol.2012 No.10

In order to reduce whole energy consumed in the building, the ratio that heating and air conditioning take in charge of within the building should be decreased considering heat loss and gain of the building. That is, heating and air conditioning system should provide the required spare energy only by calculating the energy demand of the building. The process of calculating heating and air conditioning energy demand is specified in EN ISO 13790(2008) and the calculation method is divided into quasi-steady-state calculation method and dynamic calculation method. Regarding quasi-steady-state calculation method, its calculation process is simpler comparing with dynamic calculation method, but its accuracy is not good. So the alternative that have the dynamic effect even in the condition of steady state is needed in order to raise the accuracy and the concept of gain and loss utilization factor are established for that reason. Gain and loss utilization factor are the experiential value and they gets different along the variables of ?H,0and TH,0 and those variables are decided by each country, however, they are current status that the values regulated in EN ISO 13790(2008) are used in domestic country not the values that are adequate for domestic environmental conditions. So this paper is willing to calculation method of the variables ?H,0 and TH,0 to decide gain utilization factor that is adequate for domestic conditions through foreign and domestic standards.

PMV 제어에 따른 VAV시스템의 실내온열환경 및 에너지소비 특성 비교

장향인(Hyang-In Jang),곽희정(Hee-Jeong Kwak),서승직(Seung-Jik Suh) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.11

The purpose of this work is to analyze the effects of air-conditioning zone control using thermal comfort index and thereby reduce energy and increase the comfort of residents. This researcher used EnergyPlus to compare indoor thermal environment and energy consumption by temperature control and PMV control. According to the comparison analysis, thermal comfort percentage in PMV control was considerably higher than that in the temperature control. And, the energy consumption in PMV control was smaller that in temperature control (22.5 to 24.5℃) so that an air-conditioning zone was found to be very effectively controlled. Like this, this work proved the effects of the control by the use of thermal comfort index. In the future, studies on thermal comfort control for various systems will be conducted.

시판 누룩으로 제조한 막걸리의 품질특성과 biogenic amine 생성

정석태(Seok-Tae Jeong),곽희정(Hee-Jung Kwak),김순미(Soon-Mi Kim) 한국식품과학회 2013 한국식품과학회지 Vol.45 No.6

본 연구는 국내 약ㆍ탁주 제조업체에서 사용하는 대표적인 개량누룩 1종과 재래누룩 4종을 선발하여 막걸리를 담고, 담금 과정 중의 누룩에 따른 술덧의 이화학적, 미생물학적 변화와 BA 생성 특성 및 이들의 상관관계를 조사하고자 하였다. 발효 초기 술덧의 pH는 4.40-5.00이었으나 4일째 감소한 후 이후 약간 증가하는 경향을 나타내었다. 발효 7일째의 총 산 함량은 시험구 간의 차이가 크게 나타나 누룩 C가 가장 많았으며, 개량누룩을 사용한 누룩 A가 가장 낮았다. 술덧의 당도는 누룩 D가 가장 낮았으며, 누룩 A는 발효 초기부터 7일까지 가장 높은 당도를 유지하였다. 발효 7일째 술덧의 색도를 측정한 결과 밝기는 누룩A가 가장 높고, 누룩 E가 가장 낮았으나 적색과 황색은 이와 반대되는 결과를 보여주었다. 술덧의 알코올 농도는 누룩 A가 가장 많았으며, 누룩 B, 누룩 C, 누룩 E, 누룩 D의 순이었으나, 휘발산은 알코올 농도가 가장 많았던 누룩 A의 함량이 가장 낮았다. 술덧의 효모 수와 총 세균 수는 발효 1일에 비해 7일에 감소하였다. 발효 7일째 효모 수는 가장 높은 알코올 농도를 나타낸 누룩 A가 가장 많았고, 총 세균 수는 누룩 E가 가장 많았다. 술덧에서 검출된 BA는 총 3종으로 putrescine은 5종의 술덧 모두에서 발효 초기부터 검출되었으며, tyramine은 누룩 C, 누룩 D, 누룩 E의 발효 7일째에서만 검출되었고, cadaverine은 누룩 E에서만 발효 1일째부터 검출되었다. 이들 술덧의 미생물 균주의 변화를 PCR-DGGE 기법으로 살펴본 결과 발효 1일과 7일째 BA 생성량이 가장 많았던 누룩 E의 밴드가 가장 다양해지는 것을 확인할 수 있었다. 위의 이러한 특성 간의 상관관계를 분석한 결과 총 세균수는 putrescine 및 총 BA 함량과 정의 상관관계를 나타내었고, BA와 색도(L, a, b값) 역시 유의적인 상관관계가 있음을 알 수 있었다. 본 연구는 막걸리의 품질 지표로 활용될 수 있는 BA의 생성이 누룩의 종류에 따라 다르다는 것과 함께 막걸리의 품질 관리는 누룩의 제조 단계에서부터 시작되어야 함을 시사하고 있다. Makgeolli mashes that were brewed using five different commercial nuruks (fermentation starters) were investigated for changes in physicochemistry, microbial diversity, and biogenic amine (BA) production. Mash A brewed with the nuruk (Gaeryang-nuruk) had the highest level of alcohol concentration and the greatest number of yeast cells, whereas mash E had the greatest number of bacterial cells. Only three biogenic amines were detected in the makgeolli mashes: tyramine, putrescine, and cadaverine. Using a PCR-DGGE technique, we observed that mash E had the highest BA production, and had the greatest number of bands on the denaturing gradient gels. We also observed that the numbers of bacterial cells correlated significantly with the putrescine and the total BA content, and that the BA content correlated significantly with the color values (L, a, b). This study shows that the quality of a makgeolli can depend on the type of nuruk. Therefore, we suggest that the quality management of makgeolli should start with the stage of nuruk manufacture.

저온공정 ZnO 적용에 따른 역구조 고분자 태양전지 소자 성능 연구

전재민(Jae Min Jeon),신동열(Dong Yeol Shin),정우진(Woo Jin Jeong),곽희정(Hee Jung Kwak),김준영(Jun Young Kim) 한국태양에너지학회 2021 한국태양에너지학회 학술대회논문집 Vol.2021 No.5

저온공정 ZnO 적용에 따른 역구조 고분자 태양전지 소자 성능 연구

전재민(Jeon Jae-Min),신동열(Shin Dong-Yeol),정우진(Jeong Woo-Jin),곽희정(Kwak Hee-Jung),김준영(Kim Jun-Young) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.3

Recently, active research is being conducted on polymer solar cells to improve power conversion efficiency by developing new device structures, synthesizing polymer materials, and applying them to charge extraction layers. In this study, we analyzed the influence of ZnO on the performance of solar cells by using various ZnO thin films (using the high and low temperature sol-gel processes and the nanoparticle process) as an electron extraction layer in inverted polymer solar cells based on PBDB-T:ITIC. The ZnO thin film was formed by the high-temperature (450°C) sol-gel process, which resulted in an increase in the sheet resistance of the ITO electrode by five times. As a result, the power conversion efficiency of the polymer solar cells was low (4.12%). Conversely, in the nanoparticle process, butanol-based ZnO exhibited better dispersion and surface properties than the IPA-based ZnO, resulting in improved performance of the polymer solar cell (PCE of 6.35% and 4.58% with butanol and IPA-based ZnO, respectively). Additionally, a ZnO precursor solution was developed using the low-temperature (150°C) sol-gel process, which was applied as an electron extraction layer in an inverted polymer solar cell. Consequently, the device performance significantly improved (PCE of 8.89%)due to the formation of a ripple-shaped surface, which facilitated the extraction of electrons due to the excellent surface roughness.