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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 (CO<sub>2</sub>) 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 CO<sub>2</sub>. 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 CO<sub>2</sub> 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.
정효진(Hyojin Jung),오환섭(Hwansup Oh),허민구(ngu Hur),박철희(Chulhee Park) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
At this research, we examined continuous life span as a probability by the 'temperature changes experiment' of an automobile tungsten filamenet which is considered creep character, facture behavior for material of small amount surface and evaluation of life span as well as prediction. As a result, we confirmed relation ship between the temperature of filament and the continuity span of life and examined the facture mechanism.
정효진(Hyojin Jung),정유나(Yuna Jeong),이성길(Sungkil Lee) Korean Institute of Information Scientists and Eng 2018 정보과학회논문지 Vol.45 No.10
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.
권예진(yejin kwon),정효진(hyojin jung),윤은지(eunji yoon),박용범(yongbom park) 한국정보과학회 2012 한국정보과학회 학술발표논문집 Vol.39 No.1B
요구사항은 소프트웨어 아키텍처 설계의 핵심 요소로서, 아키텍처의 구축과 생성의 근거를 제시해준다. 이러한 요구사항 분석을 위해 다양한 요구사항 분석 방법이 제안되고 있는데 그 중 대표적인 기법은 시나리오 기반의 분석, 목표 기반의 분석, 시나리오를 이용한 목표기반의 분석이다. 그러나 이러한 요구사항 분석 방법들은 정형화되어 있지 않아 요구사항을 분석하는 아키텍트에 의존할 수밖에 없다. 따라서 본 논문에서는 텍스트학을 기반으로 정형화된 기법인 거시구조를 이용한 요구사항 분석 방법을 기반으로 요구사항 분석 프로세스를 개선하여 제안하였다. 기존 연구에서 제안한 거시구조 요구사항 분석 방법을 재해석하여 요구사항을 분석하는 단계를 나누고 각 단계의 시스템 요소 설계와 구조를 정의하여 요구사항 분석 프로세스의 설계를 수행하였다.