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( Nahyeon Cho ),( Young-yeul Kang ),( Ji-yeon Kim ),( Young-sam Yoon ),( Tae-wan Jeon ) 한국폐기물자원순환학회 2022 ISSE 초록집 Vol.2022 No.-
The use of electrical and electronic equipment (EEE) is rapidly increasing with digitalization and electrification. For carbon neutrality and circular economy, many countries are interested in plastic and increasing attention is paid to recycling plastic comprised approximately 2-30% of EEE. Small EEE, compared to large appliances (e.g. refrigerator, washing machine, TV, air conditioner, vending machine), are frequently and easily thrown away because they are replaced with new products for reasons such as changed design and upgraded performance. Recycling of small waste electrical and electronic equipment (WEEE) plastics is a solution that can reduce the amount of waste treated by incineration and landfill. To realize a circular economy and carbon neutrality, it is necessary to improve factors that impede recycling, such as plastic waste treatment in the informal sector and manage hazardous substances in plastics for safety. In this study, firstly, Material flow analysis (MFA) was conducted using national statistical data and field survey results to evaluate the entire process of small WEEE plastics to identify factors that hinder the utilization of plastic waste as a recycled resources at each stage of the life cycle, and propose improvement measures to respond for global plastic management policy Also, to assessment the recycling safety of the WEEE plastics for reuse, the contents of following substances were analyzed: regulatory substances (e.g. heavy metals, brominated flame retardants and phthalates) managed under Restriction of Hazardous Substances in electrical and electronic equipment (RoHS) and Korea’s Act on Resource Circulation of Electrical and Electronic Equipment and Vehicles as well as unregulated substances. The conclusions are drawn concerning the future strategic development in relation to small WEEE plastics management.
조나현 ( Nahyeon Cho ),강영렬 ( Youngyeul Kang ),이선주 ( Sunju Lee ),엄남일 ( Namil Um ),최자형 ( Jahyung Choi ),김가빈 ( Gabin Kim ),전태완 ( Taewan Jeon ),유명수 ( Myungsoo Yoo ) 한국폐기물자원순환학회(구 한국폐기물학회) 2021 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2021 No.-
최근 플라스틱의 무분별한 사용과 폐플라스틱의 부적정 관리로 인한 환경문제가 세계적 현안으로 대두되어 플라스틱 포장재 및 일회용 플라스틱 제품 등의 사용을 줄여나가고 있다. 우리나라도 2018년 5월에 「재활용 폐기물 종합관리 대책」 수립하여 2030년까지 폐플라스틱 발생량을 50 %로 감소시키고 재활용률 70% 상향을 목표로 정책을 마련하였다. 국내 사업장 일반폐기물로 배출되는 폐플라스틱은 2018년 기준으로 총 폐플라스틱 발생량의 53%로 생활계 폐플라스틱 배출량(39%)을 상회하였지만, 사업장 폐플라스틱에 대한 관심과 연구는 PET병, 일회용품 등 생활계 폐플라스틱에 비해 부족하다. 또한 사업장 폐플라스틱은 PP, PS 등 재질 구분 없이 대부분 폐합성수지류(51-03-01)로 혼합 배출되어 순환자원 확보를 위한 관리 방법 개선이 필요한 실정이다. 본 연구는 순환경제의 실현과 재활용 폐기물 종합관리 대책의 실효성 진단을 위해 국내 사업장 일반폐기물로 배출되는 폐합성고분자화합물(51-03)의 전과정 평가를 수행하고자 하였다. 먼저 폐플라스틱 재활용 제품의 안전성 평가를 위해 국내 사업장 폐플라스틱 배출시설에서 발생한 폐플라스틱을 대상으로 중금속 및 플라스틱 첨가제 등의 유해물질 함유실태를 조사하였다. 또한, 원료에서 최종 처분단계까지의 플라스틱 물질흐름도를 작성하여 순환단계별 문제점을 파악하고 이에 대한 개선방안을 제시하고자 하였다.
시계열 교차검증을 적용한 2,3-BDO 분리공정 온도예측 모델의 초매개변수 최적화
안나현 ( Nahyeon An ),최영렬 ( Yeongryeol Choi ),조형태 ( Hyungtae Cho ),김정환 ( Junghwan Kim ) 한국화학공학회 2021 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.59 No.4
Recently, research on the application of artificial intelligence in the chemical process has been increasing rapidly. However, overfitting is a significant problem that prevents the model from being generalized well to predict unseen data on test data, as well as observed training data. Cross validation is one of the ways to solve the overfitting problem. In this study, the time-series cross validation method was applied to optimize the number of batch and epoch in the hyperparameters of the prediction model for the 2,3-BDO distillation process, and it compared with K-fold cross validation generally used. As a result, the RMSE of the model with time-series cross validation was lower by 9.06%, and the MAPE was higher by 0.61% than the model with K-fold cross validation. Also, the calculation time was 198.29 sec less than the K-fold cross validation method.