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A Study on Separation and Management of Excavated Materials Containing Waste in Korea
( Kyuyeon Kim ),( Suyoung Lee ),( Heesung Moon ),( Taewan Jeon ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 ISSE 초록집 Vol.2019 No.-
The purpose of this study is to survey screening system and resource recovery of excavated materials containing waste from various excavating fields such as reconstruction of landfill sites for reuse, reclamation of unsanitary landfill and residential land development of waste dumping sites. Through the analysis of the samples we were able to understand the characteristics of the excavated materials containing waste such as calorific value, elementary composition, TOC, foreign material content and LOI. Separation technology for excavated materials containing waste started to be developed in the early 2000s and more than 40 techniques were found in Korea Patents, Utility models and New Environmental Techniques. There were about 150 excavation cases of landfilled materials containing waste and most of them were digging out from unsanitary landfills and developing residential land. The selection process of excavated materials containing waste is mainly consist of size sorting process for soil and rocks by the net size of trommel, and plastic sorting process for film-like combustible fractions by rake separation. Further precise separating process is carried out if necessary. It has been found that elimination of the moisture of excavations, removal of attached soil from the surfaces of the excavated combustibles and the quantitative supply method of the input devices are the main operating factors as essential factors for the optimal separation of excavated materials containing waste. For efficient management and recycling of excavated materials containing, it is necessary to set criteria of ash content in separated combustibles and criteria organic matter content in separated soils.
A descriptive study of claims for occupational mental disorder: adjustment disorder
Kim Kyuyeon,Kim Inah,Youn Kanwoo 대한직업환경의학회 2020 대한직업환경의학회지 Vol.32 No.-
Background: The number of claims of Industrial Accidents Compensation Insurance (IACI) for mental illness has increased. In particular, the approval rate was higher in cases with confirmed incident circumstances such as adjustment disorder, acute stress disorder, and post-traumatic stress disorder. With increased numbers of filed IACI applications and their approval rates, the need to evaluate various work-related incidents and stressors consistently is also increasing. Method: In January 2015–December 2017, among the cases of industrial accidents filed for mental illness and suicide by the Korea Workers' Compensation and Welfare Service, 76 filed or approved adjustment disorder cases were included. The cases of adjustment disorder were applied in this study to the “Criteria for Recognition of Mental Disorders by Psychological Loads” established in Japan in 2011 and investigated if cases were approved/rejected consistently. Additionally, features with the greatest influence on approval/rejection were examined quantitatively. Results: The number of applications more than doubled from 2015 to 2017, with the approval rate rising from 66.7% to 90.6%. Among the major categories, applications of adjustment disorder related to “interpersonal relationships” were the largest number of applications. Applications related to “sexual harassment”, “interpersonal relationships”, and “accidents and experiences including fires” showed relatively higher approval rate. The approval rate was the lowest in the case of “change in the amount and quality of work.” Conclusions: Approved cases tend to have special precedents and strong intensity. The main reasons for the rejection were that there were no special precedents and that the intensity of the case was weak. These 2 were the most important factors in determining approval/rejection.
김규연(Kyuyeon Kim),이수영(Suyoung Lee ),전태완(Taewan Jeon),신선경(Sunkyoung Shin) 유기성자원학회 2019 유기성자원학회 학술발표대회논문집 Vol.2019 No.춘계
과거 산업화와 경제발달 과정에서 크게 증가하였던 폐기물이 효율적인 재활용이나 적정 관리되지 못한 채 생활주변의 저지대나 웅덩이에 단순 투기되거나 사후관리가 계획되지 못한 비위생 매립시설에 최종처분 되곤 하였다. 폐기물 발생량의 증가와 사용종료 및 신규 매립지 확보를 위해 사용종료된 비위생매립지 정비사업의시작과「자원순환기본법」제정 등과 함께 폐기물처분부담금의 도입 등 폐기물의 자원화 정책이 강화되면서 매립억제 및 기매립 자원의 재활용을 위한 매립폐기물의순환이용과 순환형매립지 조성사업이 확대되고 있다. 본 연구에서는 폐기물혼입굴착물질의 선별공정 기술조사, 관리규정 및 국내외 굴착·선별 사례와 관리동향 등을 조사하였다. 폐기물혼입굴착물질의 국내 선별기술은2000년대 초반부터 제도적으로 등록 및 인증이 이루어져, 현재 특허 및 실용신안과환경신기술 분야에서 40여건을 확인할 수 있었다. 매립지 정비 및 순환형매립지 조성, 택지 개발 등 건설공사에 따른 폐기물혼입굴착물질에 대한 굴착·선별사례는 약150여건으로 추산되며 비위생매립지 및 택지·대지개발공사가 많은 것을 알 수 있었다. 폐기물혼입굴착물질의 선별공정은 주로 토사류 등 불연물 선별을 위해 트롬멜체망의 크기에 따른 선별, 가연분 선별을 위해 풍력, 갈퀴선별로 구성되어 있으며, 필요 시 추가적인 정밀선별을 실시하고 있었다. 매립 굴착물질의 함유 수분과 비닐류에 부착된 토사의 탈착분리, 투입장치의 정량적 공급방법이 주요한 운전 요소이자 효율적 선별의 평가 요소임을 알 수 있었다.