납사분해 공정 내 열 교환 네트워크 경제적-환경영향 평가

정효진,정수빈,안유찬,Hyojin Jung,Subin Jung,Yuchan Ahn 한국화학공학회 2023 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.61 No.3

Petrochemical is an energy consuming industry that consumes about 30% of total industrial energy consumption and is a representative carbon dioxide (CO₂) emission source. Among them, the Naphtha Cracking Center (NCC), which produces ethylene, propylene, propane and mixed C4, consumes large amounts of energy and emits significant amounts of CO₂. For this reason, an integrated techno economic- environmental impact assessment aimed at reducing energy consumption and environmental impact factors is necessary to ensure efficiency in terms of economics and environment. This study aims to analyze the efficiency of the heat exchanger network used in the existing NCC base on the pinch analysis and select an improvement plan that can reduced energy consumption. In order to reduces the utility consumption in the process, an optimal heat exchanger network considering the high-temperature and low-temperature stream was derived, and the economic evaluation was conducted by considering the trade-off between the reduction in utility consumption and the increase in heat exchanger installation cost. In addition, an environmental impact assessment was conducted on the reduced CO₂ emission in consideration of the environmental aspect, and the economic environmental impact assessment used the payback period to recover the invested funds to come up with an energy saving plan that can be applied based on the actual process. As a result of considering the economic-environmental impact assessment, when the environmental impact assessment was not considered, it was 4.29 months, 3.21 months, and 3.39 months for each case, and when considering the environmental impact assessment, it was 4.24 months, 3.17 months, and 3.35 months for each case. These results appeared equally both when the environmental impact assessment was not include and when it was include. In addition, a sensitivity analysis was conducted for each case to determine how important factors affect the payback period. As a result of the sensitivity analysis, the cost of the heat exchanger was identified as a major factor influencing the overall cost.

딸기온실에서 점박이응애의 화학적방제와 생물적방제 효율 비교

정효진,강주완,이현승,장호중,박정준,Jeong, Hyo Jin,Kang, Ju-wan,Lee, Hyun Seung,Jang, Hojung,Park, Jung-Joon 한국환경생물학회 2021 환경생물 : 환경생물학회지 Vol.39 No.1

환경친화적 생물적방제를 위해 수출딸기온실에서 해충인 점박이응애 밀도 감소 효율을 화학적방제와 생물적방제로 나누어 동일한 크기의 동일한 온실에서 각각 비교하였다. 생물적방제 온실은 점박이응애의 천적인 칠레이리응애만을 이용하였고, 화학적방제 온실은 일반 화학합성 농약을 이용하여 점박이응애의 밀도를 조절하였다. 화학적방제 온실에 비해 생물적방제 온실에서 점박이응애 모든 태의 밀도가 낮게 관찰되었으며, 생물적방제를 위한 비용이 화학적방제에 비해 낮았다. 이러한 결과는 수출딸기의 주요해충인 점박이응애의 방제에 칠레이리응애를 이용한 생물적방제가 가능한 것을 나타내고 있다. To establish the environmentally friendly biological control of two-spotted spider mites (TSSM), Tetranychus urticae, in exported strawberry greenhouses, the TSSM density reduction efficiency of chemical and biological control measures was compared in commercial, exported strawberry greenhouses. In the biological control greenhouse, only Phytoseiulus persimilis, a natural enemy of TSSM, was released, and the chemical control greenhouse was only sprayed with commercial chemical pesticides. The density of each developmental stage of TSSM was higher in the chemical control greenhouse than in the biological control greenhouse. The management costs were lower for the biological control greenhouse than the chemical control greenhouse. These results suggest that it is possible to effectively control TSSM using P. pesrsimilis in exported strawberry greenhouses.

지리가중회귀분석을 이용한 은평뉴타운 지가 분석

정효진,이지영,Jung, Hyo-jin,Lee, Jiyeong 한국공간정보학회 2015 한국공간정보학회지 Vol.23 No.5

서울시는 강북의 노후화 및 강남과 강북의 경제 불균형을 해소하고자 뉴타운 사업을 시행하였고, 이에 따라 은평구는 시범지구로 지정되었으며 2013년 최종적으로 사업이 완료되었다. 이에 본 연구는 은평구에서 진행된 뉴타운 사업에 따라 발전된 사회적, 경제적 요소들이 지가에 미치는 영향의 정도를 공간 효과를 반영한 지리가중회귀모델을 이용하여 분석하였다. 분석결과 기존의 지가분석에서 주로 이용된 선형회귀모델에 비해 높은 설명력을 가지고 있었으며, AIC값과 잔차의 Moran'I를 통해 좀 더 적합한 모델로 판정하였다. 또한 지역적으로 회귀계수의 차이가 있었으며 부호가 다르게 나타나는 경우도 있어 선형회귀모델을 통한 전역적인 분석방법보다 자세한 설명이 가능해졌다. 추후 은평구 개발에 있어 공간적 특성을 고려하여 지역을 개발한다면 실효성 강화에 도움이 될 수 있을 것으로 판단된다. Newtown Business of Seoul had been performed to reduce deterioration of Gangbuk and economic inequality between Gangnam and Gangbuk. According to this, Eunpyeong-gu was set as test-bed for Newtown business and Newtown business had been completed until 2013. This study aims to analyze the influence of social and economical factors which affect land price using GWR (Geographically Weighted Regression) considered spatial effect. As a result of analysis, GWR model demonstrated a better goodness-of-fit than OLS (Ordinary least square) model typically used in most study. Furthermore, AIC value and Moran's I of residual prove that GWR model is more suitable than OLS model. GWR model enable to explain more detailed than global regression model as coefficient and sign show different value locally. In future, this research will be helpful to develop Eunpyeong-gu considering spatial characters and strength effectiveness of development.

정원장미 신품종 ‘수현’ 육성

정효진(Hyo-Jin Jung),최호정(Ho Jeong Choi),메이 띤 캉(May Thinn Khaing),한태호(Tae-Ho Han) 한국원예학회 2017 한국원예학회 학술발표요지 Vol.2017 No.10

스피치 상황에서 발표자의 특성이 발표불안에 미치는 영향에 관한 연구

정효진(Jung, Hyo Jin),탁진영(Tak, Jin Young) 계명대학교 사회과학연구소 2018 한국사회과학연구 Vol.37 No.2

본 연구는 스피치 상황에서 발표자의 특성인 자기 초점적 주의 성향, 몰입 성향, 자기 수용이 발표 불안에 어떠한 영향을 미치는지 살펴보았다. 구체적인 연구 결과는 다음과 같다. 첫째, 발표자의 자기 초점적 주의 성향은 발표 불안에 유의미한 영향을 미치는 것으로 나타났다. 자기 몰입은 발표 불안에 정(+)의 영향을, 일반적 자기 초점적 주의 성향은 부(-)의 영향을 미치는 것으로 나타났다. 상대적인 영향력은 자기 몰입이 발표 불안에 더 큰 영향을 미치는 것으로 나타났다. 둘째, 발표자의 몰입 성향은 발표 불안에 유의미한 부(-)의 영향을 미치는 것으로 나타났다. 몰입은 요인 분석을 통해 통제 몰입, 성취 몰입, 목적 달성 몰입, 타인 회피 몰입의 4개의 요인이 도출되었는데, 이들 요인이 발표 불안에 세부적으로 어떠한 영향을 미치는지도 살펴보았다. 4개의 몰입 요인 중 발표 불안에 미치는 상대적인 영향력은 성취 몰입과 통제몰입이 높은 수준을 보였다. 셋째, 발표자의 자기 수용은 발표 불안에 부(-)의 영향을 미치는 것으로 나타났다. 자기 수용은 인지 행동적 불안과 정서적 불안에도 유의미한 부(-)의 영향을 미치는 것으로 나타났다. 이와 같이 본 연구에서는 발표자의 개인적 특성이 발표 불안 감소를 얼마나 설명하는지 검증함으로써 앞으로 발표자 특성에 맞는 차별화된 스피치 교육 운영 방안을 제시하는데 도움을 줄 것으로 기대된다. The purpose of this study was to identify the influence of presenter characteristics of self-focused attention, flow and self-acceptance on public speaking anxiety. This study also examined effects of four flow factors and two public speaking anxiety factors identified through factor analysis. The results of study were as follows. First, self-focused attention tendency of presenters had significant effects on public speaking anxiety. ‘Self-absorption’ had positive effects on public speaking anxiety while ‘general self-focused attention’ had negative effects. In relative terms, self-absorption had greater effects on public speaking anxiety. Second, flow tendency of presenters had significant negative effects on public speaking anxiety. The four flow factors of ‘control flow’, ‘achievement flow’, ‘achievement of goal flow’ and ‘avoiding others flow’ were induced through factor analysis and were examined for their effects on public speaking anxiety. Of four flow factors, achievement flow and control flow had relatively greater influence on public speaking anxiety. Third, self-acceptance of presenters had significant negative effects on public speaking anxiety. Self-acceptance also had significant negative effects on both cognitive-behavioral anxiety and emotional anxiety. By examining and testing influence of presenters’ personal characteristics on public speaking anxiety, this study will contribute to better operation of speech education and to establishing effective learning strategy in actual speech education fields.

자동차 변속기와 베어링 기술 동향

정효진(Hyo-Jin Jung),이상훈(Sang-Hoon Lee) 한국자동차공학회 2016 오토저널 Vol.38 No.8

양파 품종 및 색상에 따른 쿼세틴 함량과 항산화 효과

정효진(Hyo Jin Jung),서종분(Jong Bun Seo),이야성(Ya Song Lee),손동모(Dong Mo Son),김민영(Min Young Kim),윤봉기(Bong Ki Yun),남승희(Seung Hee Nam),이을태(Eul Tai Lee),김철우(Cheol Woo Kim) 한국원예학회 2011 한국원예학회 학술발표요지 Vol.2011 No.10

FPGA 기반의 다중주파수 도약 신호 실시간 추적 방안에 관한 연구

정효진(Jung Hyo Jin),심규홍(Sim Kyu Hong),박철순(Park Cheol Sun),박영미(Park Yeong Mi) 한국통신학회 2011 한국통신학회 학술대회논문집 Vol.2011 No.11

프리미티브와 안내 벡터필드 기반 균열맵 합성

정효진(Hyojin Jung),정유나(Yuna Jeong),이성길(Sungkil Lee) 한국정보과학회 2018 정보과학회논문지 Vol.45 No.10

균열은 풍화 작용이나 충격에 의한 표면의 변화를 효과적으로 보여준다. 일반적으로 균열 렌더링은 물리 기반의 시뮬레이션을 이용하나, 그 비용이 크고 물리적이지 않은 효과를 직관적으로 얻기 어렵다. 본 논문은 프리미티브와 안내 벡터필드 기반의 균열맵 합성 기법을 제안한다. 다양한 균열 패턴은 미리 높이맵 프리미티브로 정의되며, Perlin 노이즈를 이용하여 생성된 안내 벡터필드를 따라 그 배치가 결정된다. 결과 균열맵은 프리미티브들을 합성한 높이맵으로 정의되며, 다수의 프리미티브가 정의되는 경우는 최소 높이값을 이용한다. 이러한 프리미티브 기반의 접근 방식은 물리 기반 렌더링과 달리 사용자가 원하는 대로 보다 직관적으로 다양한 균열 효과를 얻을 수 있도록 한다. Cracks effectively show surface changes caused by weather or impacts. In general, crack rendering uses physically-based simulations. However, these approaches require huge computational cost, and it is hard to intuitively obtain non-physical effects. This paper presents a crack-map synthesis technique based on crack-map primitives and a guidance vector field. Diverse crack patterns are pre-defined as height maps. Their placements are determined by the Perlin noise-based guidance vector field. The output crack map is defined as a composite of primitives. When multiple primitives exist in the same area, the lowest of their heights is selected. Unlike other physically-based rendering approaches that have previously been used, our primitive-based approach allows us to easily obtain intuitive crack effects as desired.

영아에서 반복적 천명에 영향을 미치는 요인: Respiratory 감염과 반복적 천명과의 연관성 Syncytial Virus

정효진 ( Hyo Jin Jung ),김민정 ( Min Jung Kim ),이관 ( Kwan Lee ),김현지 ( Hyun Ji Kim ),변순옥 ( Soon Ok Byun ) 대한소아알레르기호흡기학회(구 대한소아알레르기 및 호흡기학회) 2011 소아알레르기 및 호흡기학회지 Vol.21 No.4

Purpose: This study investigated factors affecting recurrent wheezing in infants, focusing on whether or not respiratory syncytial virus (RSV) infections in children <3 years of age induce recurrent wheezing later in life. Methods: The inclusion criteria were children <3 years of age who were hospitalized for an RSV infection from January 2006 to December 2009. We evaluated lateral flow immunochromatography (RSV Respi-Strip test). Subjects with at least three episodes of physician-verified wheezing were defined as recurrent wheezers. A group of 79 children hospitalized with RSV infections were compared with a matched control group. The following data were collected: age, gender, admission duration, gestational age, obesity, history of atopic dermatitis, parental history of allergic diseases, exposure to passive smoking, exposure to indoor animals, and daycare attendance. Results: Rates of obesity and exposure to passive smoking were significantly higher in the RSV group than those in the control group. The frequency of recurrent wheezing in the RSV group (39.2 %) was higher than that in the control group (10.1%). Compared to the control group, recurrent wheezing occurred 5.76 times more often in the RSV group, 2.49 times more often in males, and 2.41 times often in patients with a parental history of allergic diseases. Conclusion: The results demonstrated that RSV infection is significantly associated with recurrent wheezing, and that the risk is higher in male children and in children with a parental history of allergic diseases. (Pediatr Allergy Respir Dis(Korea) 2011;21:319-325)