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유신성,오효정 한국기록관리학회 2021 한국기록관리학회지 Vol.21 No.2
Interest in the “Corona White Paper” is increasing, as it has been prolonged to more than a year since the first confirmed COVID-19 case. The National Archives of Korea began collecting records for the production of government-level white papers, and some local governments and institutions are preparing to establish their corona white papers. However, the existing disaster white paper simply presents a summary of the situation and does not include the analysis or evaluation of the disaster response results, making the established measures unsuitable for similar disasters. In particular, most of the data are collected and analyzed manually by some experts, which is costly and time-consuming. This study presents a plan to build a white paper that can reflect a mutual understanding with the citizens by automatically collecting and analyzing online records, namely, records from institutional websites, online news platforms, and social media records. The types and characteristics of white papers and online media were analyzed; guidelines that match the four attributes of the white paper by referring to the existing white paper on infectious diseases were presented; and their effectiveness through actual construction examples were verified. Moreover, this study aims to establish effective preemptive countermeasures in the event of a novel disaster and maximize the record and promotion of corrective activities by collecting and recording reactions from citizens. Furthermore, the study helps eliminate unilaterally drafted top-down white papers. 작년 국내 첫 코로나-19 확진자 발생 이래 1년이 넘은 현재까지 팬데믹 상황이 장기화되면서 ‘코로나 백서’에 관한 관심이 높아지고 있다. 이에 부응해 국가기록원은 정부 차원의 백서 제작을 위한 기록물 수집 작업을 시작하였으며, 일부 지방자치단체와 기관에서도 독자적인 코로나 백서의 구축을 준비하고 있다. 그러나 기존 재난백서는 단순한 상황에 대한 정리일 뿐 대응 결과에 대한 분석이나 평가가 포함되지 않아 이후 유사 재난이 발생 시 참고하여 활용하기에는 무리가 있다. 특히 자료 대부분을 일부 전문가들의 수작업에 의존하고 있어 백서 구축에 드는 시간과 비용이 많이 든다. 이에 본 연구는 온라인 기록물 즉, 기관의 웹 문서, 인터넷 뉴스, SNS 기록물 등을 자동으로 수집⋅분석함으로써 시민들과의 상호이해가 반영될 수 있는 백서 구축방안을 제시한다. 이를 위해 백서와 온라인 미디어의 유형 및 특징을 분석한다. 특히 기존의 감염병 관련 백서를 참고하여 백서의 4대 속성에 부합한 가이드라인을 제시한 후 실제 구축예시를 통해 실효성을 검증하고자 한다. 본 연구를 통해 일부 공무원이나 전문가들이 일방적으로 작성한 하향식의 백서가 아닌 시민의 반응을 수렴하고 기록화함으로써 미래의 새로운 재난 발생 시 효과적인 선제대응 방안을 마련하는 동시에 시정 활동 기록 및 홍보를 극대화할 수 있을 것으로 기대한다.
Minimum Lubrication Technique Using Silicone Oil for Friction Reduction of Stainless Steel
유신성,김대은 한국정밀공학회 2013 International Journal of Precision Engineering and Vol.14 No.6
Liquid lubricants are widely used to reduce the friction and wear of mechanical components. In this research, silicone oil was used in order to investigate its effectiveness in the lubrication of stainless steel. Specifically, the aim was to assess the friction reduction characteristics of silicone oil under minimum lubrication conditions. Silicone oil lubricants can be easily recycled,and they are comprised of relatively non-hazardous chemicals. Also, silicone oil lubricants are well known for their thermally stable properties. They have a relatively high flash point temperature and a high auto-ignition point temperature. Friction experiments were performed using silicone oil as the lubricant for stainless steel specimens. As a means to apply the minimum amount of lubricant, the thermal evaporation coating method was used. The stainless steel plates were slid against stainless steel balls in the friction tests. The results of the friction experiments showed that the thermally evaporated silicone oil lubricant was effective in reducing the friction of stainless steel. It was also found that the friction signal of the lubricated condition was more stable than that of the unlubricated condition. The results of this work demonstrated the possibility of minimum lubrication for friction reduction of metals.
유신성(Shin Sung Yoo),허윤영(Yoon-Young Heo),김대은(Dae-Eun Kim) Korean Society for Precision Engineering 2014 한국정밀공학회지 Vol.31 No.5
Surface roughness of mechanical components is an important factor which affects the tribological phenomena. Various surface patterns have been applied to surfaces to improve the tribological characteristics of mechanical components. In this work, the friction reduction effect of micropatterns on silicon was investigated. For this purpose, micro-dimple patterns were fabricated on silicon wafer by DRIE process. In the friction experiments silicone oil was used as lubricant. Also, the lubricant was cleaned to simulate a lubricant depleted condition. In depleted lubricated condition, friction coefficient of micro-pattern specimens was lower than specimens without micro-patterns. It was found that friction reduction effect of micro-pattern could be successfully maintained even after cleaning the lubricant on the surface.
유신성(Sin-Seong Yu),최기쁨(Kippeum Choi),명현(Hyun Myung),오효정(Hyo-Jung Oh) 한국정보기술학회 2020 한국정보기술학회논문지 Vol.18 No.6
Pest managements are required preventive care before the outbreak. Recently, the correlation between pests and soil has been proved, and then it has beed increased the need for new predictive models different from existing studies. In this study, we propose prediction model of pest according to individual farms based on heterogeneous public big data. The model is focused on ‘prediction’ rather than existing ‘diagnosis’ research. In addition, we collected and refined information of various big data such as farmland, soil, pest historic records, as well as weather information, and finally utilized total of over 3.7 million data. Especially, the correlation of the collected factors was analyzed to select only the effective qualities for predicting pests. A two-step model was proposed for the prediction of pests in this study: The proposed model will be ultimately used as a preliminary study for the pest prediction and control system of ‘win-win’ using IPM(Integrated Pest Management).
근접장 광기록 시스템에서 윤활층 증발에 의한 렌즈 오염 저감 방안
유신성(Sin-Sung Yoo),이정규(Jung-Kyu Lee),김대은(Dae-Eun Kim) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
In the Near-Field Recording (NFR) technology, the gap between optical head and disk media should be maintained below 100 nm. Therefore the reliability issues in NFR become crucial. In order to achieve high reliability of NFR storage device, it is essential to reduce the lens contamination. A possible way to reduce contamination is to control the surface energy of a lens surface, since low surface energy can decrease the possibility of lens contamination. The result of this work show that lens contamination can occur by the lubricant evaporation from a disk media when laser beam irradiates. Also, it is shown that and the Self-Assembled Monolayer (SAM) film coated on an optical lens can reduce the contamination induced by lubricant evaporation.