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서지훈(Jihoon Seo),김진영(Jin Young Kim),윤대옥(Daeok Youn) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Atmospheric black carbon (BC) affects the global radiative budget and thus climate by absorbing solar radiation, heating atmosphere, and reducing snow/ice albedo. Although BC emissions from marine engines occupy only a small fraction of total anthropogenic BC emissions, those are expected to be continuously increased in future climate scenarios. In the present study, therefore, we examined possible climate impact of the BC ship emissions by using a Global Climate Model (GCM). The Community Earth System Model (CESM) developed by the US National Center for Atmospheric Research (NCAR) was employed to conduct two equilibrium climate simulations based on the BC ship emissions in the present day (the year 2000) and in the near future (the year 2050 from the RCP4.5 scenario). Composite analyses show that a small increase in the BC ship emissions could induce significant changes in atmospheric circulations, aerosol distributions, and radiative budgets through climate feedbacks. Although BC emissions from shipping are much smaller than those from domestic, industrial, and transportation sources on the lands, the BC emissions from marine engines could also be an important climate primer.
Domestic and foreign disinfection industry trends in response to COVID-19
Jisoo kim(김지수),Jungsook Choi(최정숙),Jihoon Seo(서지훈),Inwoo Choi(최인우),Philjoon Kim(김필준),Jongryul Sohn(손종렬) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5
Since the COVID-19, there has been a growing interest in disinfection in the space where many people stay for a long time, with the spread of new infections caused by Cluster Infection in multi-use facilities in Korea soaring. Since COVID-19, natural ventilation and mechanical ventilation alone have difficulty in controlling bio-aerosols in multi-use facilities, and considering water-borne infections as an infection path of COVID-19, a diverse disinfection process is required. Since the declaration of COVID-19 pandemic, attempts to replace human resources with robots or drones have been increasing due to the spread of non-face-to-face culture that minimizes interpersonal contact. Domestic disinfection is carried out through disinfectants approved by the Ministry of Environment for coronavirus, such as cleaning, spraying disinfection through dispensing drugs, and direct disinfection. Disinfecting spray is also avoided by the Central Disaster and Safety Countermeasures Headquarters in Korea and the WHO. This is because the effect of disinfection is low except in the space where the disinfectant is directly contacted, and the disinfectant stimulates the skin, eyes, and respiratory system, which is not recommended due to the high risk of exposure to the human body. Although most of the domestic and international development and commercialized disinfection technologies have UV lamp and spray disinfection methods, they have clear limitations such as weak spray disinfection effects or ozone from ultraviolet lamps. the disinfection technology needs to be considered for the harmful effects of human exposure of chemicals in disinfectants that are made for the purpose of removing microorganisms, so continuous interest and verification of the technology is needed.
화학사고 발생시 화학사고물질의 실내유입에 따른 피해 최소화 방안 연구
전현우(Jeon, Hyunwoo),김지수(Kim, Jisoo),최정숙(Choi, Joungsook),서지훈(Seo, Jihoon),최윤희(Choi, Yun-Hee),손종렬(Sohn, Jongryeul),김민영(Kim, Minyeong),정나나(Jeong, Na-na) 한국퍼실리티매니지먼트학회 2020 한국퍼실리티매니지먼트학회지 Vol.15 No.2
This study was conducted to find ways to minimize damage caused by the infiltration of hazardous chemicals into the residential area in the event of a chemical accident. The investigation was conducted on major hazardous chemicals by investigating cases of indoor infiltration among chemical accidents at home and abroad. In addition, the management plan for chemical accidents at facilities classified as vulnerable facilities(housing and public facilities, research institutes, subways) was investigated. Based on these findings, the current policies were reviewed and suggestions were made to minimize damage caused by indoor infiltration in the event of chemical accidents.
스태킹 앙상블 머신러닝 기반 미세침흡인 세포 검사의 유방암 진단 인공지능 연구
최재하(Choi Jaeha),김주헌(Kim Juheon),이용진(Lee Yongjin),이승호(Lee SeungHo),김동일(Kim Dongil),서지훈(Seo Jihoon) 한국정보기술학회 2022 Proceedings of KIIT Conference Vol.2022 No.12
국내 여성 유방암(breast cancer) 발생률은 전체 암 중 1위이다. 유방암에 의한 사망률을 줄이기 위하여 정확한 진단과 간편한 진단 방법이 요구되고 있다. 따라서 본 연구에서는 스태킹 분석을 기반으로 유방암 데이터를 머신러닝 하여 유방암 진단의 확률을 높이는 시스템을 연구한다. 본 모델에서는 스태킹 앙상블 기법의 데이터 추출방식에 재귀적 변형을 적용하였다. 결과적으로 제안한 향상된 데이터 추출 방법과 스태킹 기법을 적용하였을 때 적용하지 않은 비교군에 비하여 유방암 진단 정확도가 상승하였다. The incidence of breast cancer in women in Korea is the highest among all cancers. Accurate diagnosis and easy diagnosis methods are required to reduce the mortality rate from breast cancer. Therefore, this study studies a system that increases the probability of breast cancer diagnosis by machine learning breast cancer data based on stacking analysis. in this model, a recursive transformation was applied to the data extraction method of the stacking ensemble technique. As a result, when the proposed improved data extraction method and stacking technique were applied, the accuracy of breast cancer diagnosis increased compared to the comparative group that was not applied.