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( Chowon Kim ),( Jumin Park ),( Hyeyoung Lee ),( Dae-youn Hwang ),( So Hae Park ),( Heeseob Lee ) 한국미생물생명공학회 2022 Journal of microbiology and biotechnology Vol.32 No.5
This study evaluated the biological properties of lemongrass (Cymbopogon citratus) extracts. The EtOAc extract of lemongrass had DPPH, TEAC, and nitric oxide-scavenging activity assay results of 58.06, 44.14, and 41.08% at the concentration of 50, 10, and 50 μg/ml, respectively. The EtOAc extract had higher elastase and collagenase inhibitory activities than the 80% MeOH, n-hexane, BuOH, and water extracts and comparable whitening activity toward monophenolase or diphenolase. Also, the EtOAc fraction had higher lipase inhibitory and antimicrobial activities against Cutibacterium acnes among extracts which is known to an important contributor to the progression of inflammatory acne vulgaris, and an opportunistic pathogen present in human skin. Total phenolic and flavonoid concentrations in the EtOAc extract were 132.31 mg CAE/g extract and 104.50 mg NE/g extract, respectively. Biologically active compounds in lemongrass extracts were analyzed by LC-MS. This study confirms that lemongrass extracts have potential use as cosmetic skincare ingredients. Thus, lemongrass can be considered a promising natural source of readily available, low-cost extracts rich in antioxidant, skincare, and antimicrobial compounds that might be suitable for replacing synthetic compounds in the cosmeceutical industry.
Kim, Chowon,Lee, Jinwoo,Yoon, Hyejeong,Suhr, Jonghwan The Korean Society for Composite Materials 2022 Composites research Vol.35 No.5
Polymers are inherently vulnerable to flame, which limits their application to various high-tech industries. In addition, environmental regulations restrict the use of halogen-based flame retardants which has best flame-retardant effect. There are inorganic flame retardants and phosphorous flame retardants as representative non-halogen-based flame retardants. However, high content of flame retardants is required to impart high flame retardancy of the polymers, and this leads to a decrease in mechanical properties. In this research, a new approach for inorganic flame retardant-based polymer composites with high mechanical properties and flame retardancy was suggested. Inorganic flame retardants called as magnesium oxysulfate whisker (MOSw) were used in this research. MOSw can extinguish fire by releasing water and non-combustible gases when exposed to flame. In addition, they have reinforcing effect when added into the polymer with its high aspect ratio. Expandable graphite (EG) was used as a flame-retardant supplement by helping to form a more dense char layer. Through this research, it is expected that it can be applied to various industries requiring flame retardancy such as automobile, and architecture by replacing halogen-based flame polymer composites.
먹매김 시공 자동화 로봇 요소기술 및 요구성능 도출 기초 연구
김초원 ( Kim Chowon ),박규선 ( Park Gyu Seon ),지현서 ( Ji Hyunsuh ),김태훈 ( Kim Taehoon ),임현수 ( Lim Hyunsu ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.1
Construction robotics is rapidly forming a market in conjunction with the development of sensing and artificial intelligence technologies. The layout work for accurately constructing the shape and dimensions of the building frame requires high accuracy and precision, and is one of the high demands for productivity and quality improvement through construction automation. Thus, as a preliminary study, we derived the elemental factors and performance requirements for developing an automated layout robot. In addition, alternatives on driving and marking units were investigated based on literature review and practioner’s interview. The result of this study will be used as a basic data for the layout robot design.
옹호연합모형에서의 정책변동 경로와 정책지향학습에 관한 연구 : 한국의 정책사례에 대한 메타분석
김초원(Chowon Kim),장현주(Hyunjoo Chang) 한국국정관리학회 2021 현대사회와 행정 Vol.31 No.4
이 연구는 옹호연합모형에서 정책변동의 주요 경로는 무엇이며, 정책중개자는 누구인지, 그리고 옹호연합들의 신념체계가 변화되는 과정에서 정책지향학습이 있었는지를 분석하였다. 이를 위해 옹호연합모형을 적용한 기존 연구들을 대상으로 메타분석을 수행하였다. 한국의 정책사례에서 정책지향학습이 가장 많이 일어난 분야는 SOC 건설 및 공공갈등 분야인 반면, 정책지향학습이 가장 많이 일어나지 않은 분야는 규제 분야 외 보건 의료분야이었다. 또한 정책지향학습이 일어난 사례에서는 정부가 주요 정책중개자의 역할을 수행한 반면, 정책지향학습이 일어나지 않은 사례에서는 정부 뿐 아니라 정부와 민간 간 협의체가 주요 정책중개자의 역할을 수행하였다. 아울러 옹호연합의 신념체계에 대해 객관적 자료로 분석이 용이할 경우 정책지향학습이 일어날 가능성이 높게 나타났다. 마지막으로 정책지향학습에 의한 정책변동의 가능성 보다는 옹호연합 간 갈등 수준이 높아질수록 정책변동의 가능성이 높아진다는 사실도 확인하였다. 분석을 통해 정책지향학습을 어떻게 정의하는지에 따라 정책지향학습의 발생 여부가 달라질 수 있다는 사실을 발견하였다. 또한 정책중개자의 존재 양식이나 역할과 정책지향학습이 언제, 어떻게, 그리고 어떠한 유형으로 나타나고 정책변동에 어떻게 영향을 주는지에 대해서는 한국의 정책사례에서는 명확한 결과가 나타나지 않았다. 이는 정책지향학습이라는 개념의 모호성 때문인 것으로 보인다. This study analyzed the main path of policy change in the advocacy coalition framework, who was the policy broker, and whether there was policy-oriented learning in the process of changing the advocacy coalition’s belief system. For this purpose, meta-analysis was performed on existing studies to which the advocacy coalition framework was applied. In Korea’s policy case, the fields in which policy-oriented learning occurred the most were SOC construction and public conflict, whereas the fields in which policy-oriented learning did not occur the most were health and medical fields as well as regulation. In addition, in the case where policy-oriented learning occurred, the government played the role of a major policy broker, whereas in the case where policy-oriented learning did not take place, not only the government but also the government-private consultative body played the role of the main policy broker. Also, if the belief system of the advocacy coalition is easy to analyze as objective data, it is highly likely that policy-oriented learning will occur. Lastly, it was confirmed that the possibility of policy change increases as the level of conflict between advocacy coalitions increases, rather than the possibility of policy change through policy-oriented learning. Through the analysis, it was found that the occurrence of policy-oriented learning can vary depending on how policy-oriented learning is defined. In addition, the Korean policy case did not show clear results regarding when, how, and what types of policy brokers exist and how they exist and how they affect policy changes. This seems to be due to the ambiguity of the concept of policy-oriented learning.