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Air-Water 모델에서 액상의 유동특성에 관한 연구
오율권,서동표,박설현 한국안전학회 2004 한국안전학회지 Vol.19 No.1
In the present study, the gas injection system based on air-water model was designed to investigate the flov< characteristics of liquid phase. A PIV system was applied to analyze the flow pattern in a ladle which gas started to rise upward from the bottom. Gas flow is one of most important factors which could feature a flow pattern in a gas injection system. As the gas injected into the liquid, the kinetic energy of bubble transfer to liquid phase and a strong circulation flow develops in the liquid phase. Such a flow in the liquid develops vortex and improve the mixing process. Due to the centrifugal force, circulation flow was well developed near both wall sides and upper region respectively. Increasing gas flow was helpful to remove dead zone but, weak flow zone still exists in spite of the increasement of gas flow rate.
One-Step Synthesis of PEG-Coated Gold Nanoparticles by Rapid Microwave Heating
Seol, Seung Kwon,Kim, Daeho,Jung, Sunshin,Chang, Won Suk,Kim, Ji Tae Hindawi Limited 2013 Journal of nanomaterials Vol.2013 No.-
<P>Polyethylene Glycol- (PEG-) coated gold nanoparticles (PEG-AuNPs) are synthesized by a one-step route with rapid microwave heating. Homogeneous nucleation of the primary gold particles is enhanced by increasing the applied microwave power during the initial stage of the synthesis, increasing the temperature ramping rate (<SUB>Rr</SUB>) and resulting in decreased size and improved uniformity of the synthesized PEG-AuNPs. Using rapid microwave heating, we successfully produce uniform colloidal PEG-AuNPs with an average diameter of14.3±2.5 nm within a few minutes. By appropriate tuning of the growth parameters, microwave synthesis can produce largely colloidal PEG-AuNPs with high uniformity.</P>
Seol A Kwon,Seung Hyeon Shin 위기관리 이론과 실천 2018 Crisisonomy Vol.14 No.4
본 연구는 친환경적 도시대기환경을 위한 도시계획 제안연구로서 유사한 지형을 띄고, 지리적으로 도 인접하지만 대기환경은 차이가 있는 대전시와 청주시의 지형요인, 도시특성요인, 대기요인을 토 대로 비교분석해 보았다. 2016년 기준 미세먼지농도 상위 10일간 공기의 흐름을 비교분석한 결과 청주시는 대전시보다 미세먼지농도 상위 10일간 대기의 흐름이 정체되어 있음을 알 수 있었다. 이는 분지형 도시중심에 공업단지가 위치해있어, 외부의 미세먼지와 도심의 미세먼지가 지형적 영향으로 대기가 순환하지 못하고 정체되어, 대기의 오염도가 더 높게 나타나는 것을 알 수 있었다. 따라서 친환경적 도시대기환경 개발을 위한 공기 흐름 유도에 대한 대안은 다음과 같다. 첫째, 찬 공기 생성 지역으로서 도시외곽의 자연지역, 도시 내의 대규모 녹지대 그리고 충분한 면적을 가진 수공간 지역 을 조성하는 것이 필요하다. 둘째 찬 공기를 축적할 수 있는 지역이 필요하다. 셋째, 공기의 흐름이 가능한 통로지역이 필요하다. This research conducted a comparative analysis of Daejeon and Cheongju City which are geographically adjacent and have similar topography but different air environment in order to suggest an urban planning framework for environmentally-friendly urban air environment. It is found that the Cheongju City has a higher level of air pollution than Daejeon since the industrial complex is located in the downtown basin and thus high fine dust concentration is not circulated well. The suggested alternatives for inducing air flow for environmentally- friendly urban air environment are as follows. First, it is necessary to construct natural areas in urban outskirts, large green zones inside the city, and sufficient pond area as they are creating cold air. Second, there is a need of areas to accumulate cold air. Third, it would need a passage area allowing air flow.
Seol A Kwon 위기관리 이론과 실천 2018 Crisisonomy Vol.14 No.3
현대사회의 각종 신종위기는 환경의 변화로 나타난다. 특히 우리나라는 각종 신종위기 중에서도 대기오염으로 인한 조기 사망률과 경제적 피해는 OECD 가입국중에 가장 위험도가 높다. 본 연구는 생활위기 유형 중 미세먼지에 대한 지방정부 환경정책을 서울특별시를 포함한 6개 광역시를 중심으로 비교 분석하여 지방정부의 생활환경위기관리 정책에 대한 질적인 변화와 방안을 제시하고자 한다. 연구결과는 다음과 같다. 첫째, 예보 및 경보에만 치중한 법제도적 정책에서 예방, 대비와 대응과 관련한 구체적 법제도적 구축이 필요하다. 둘째, 생활환경위기관리 정책의 조직설계는 전문화와 체계화가 필요하다. 셋째, 생활환경위기는 지역 간 협력 네트워크 구성이 필요하다. 생활환경위기 중 미세먼지의 해결방안은 단기간에 찾기는 어려울 것이다. 그렇지만 최일선에 있는 지방정부에서 지역주민의 삶의 질 향상을 위하여 미세먼지에 대한 예방ㆍ대비ㆍ대응 정책을 확립하여 지역주민의 건강과 지역 사회의 산업 피해를 최소화 할 필요는 있다. This study aims to suggest qualitative change in local government’s policy for living environment crisis using the case of environmental policy for fine particulate matter in Korea. It also proposes how to implement such change based on a comparison analysis with the data from six metropolitan governments in Korea including Seoul. The results of this study were as follows. First, the legal and institutional policy should focus more on prevention and preparation than forecasting or warning. Second, professionalization and systematization are required for designing the relevant policy organizations. Third, inter-regional cooperation network would be needed for more effective managements of living environment crisis, despite the difficulty to reach out the fundamental solution for the issues of fine particulate matter during a short period of time.
A Study on the Influence of Social Capital on Community Disaster Resilience
Seol A Kwon,Sang Il Ryu 위기관리 이론과 실천 2020 Journal of Safety and Crisis Management Vol.10 No.4
This study highlighted the differentiation from existing researches and on the assumption that social capital will function as an important element in disaster resilience, this study was conducted to explore the influence of social capital on the community disaster resilience through relative importance analysis about the necessity of social capital for the improvement of disaster resilience. As a result, the research outcomes showed that experts recognized reliability factor as most important for the relative importance of social capital in bringing improvement of social community disaster resilience, and it was perceived that participation factor must be established. Additionally, in the result of the overall importance ranking that considered the composite weighted values, the importance was recognized by the order of social participation, politics, reliability about the administrative leaders, and community network. Based on this, it means that reliability about politics and administration are important and active participation is required from the local residents and the community.
Seol A Kwon 위기관리 이론과 실천 2017 Crisisonomy Vol.13 No.10
현대의 생활환경의 변화에 따른 위험요소들은 현재의 일상생활에 피해를 줄 뿐만 아니라 미래사회에도 영향을 미칠 정도로 축적성과 확대성을 가지고 있다. 그리고 발현된 위기들은 위협적이고 치명적인 손상을 끼치지만 인체의 감각기관이 감지할 수 없는 잠재성도 지닌다. 본 연구는 생활환경 변화로 새롭게 등장한 위기 유형들의 불확실성과 위험요소에 대한 실제적인 지방정부의 생활환경 정책을 제시하고자 한다. 연구방법은 주민들의 위험인식을 토대로 분석하였으며 연구결과 위험인식이 지방정부의 환경정책 만족에도 영향을 미치고 있음이 증명되었다. 특히 위험인식과 지방정부 환경정책간의 관계의 가설 검증에서 찾아볼 수 있는 특이점은 설명력이 높은 값의 대부분은 황사, 미세먼지, 생활폐기물매립과 같은 현재 청주시에서 이슈가 되는 위기 유형이고, 비가시적 생활환경위기영역이라는 것이다. 증명된 연구결과에 따라 실제적 생활환경위기 정책을 위해서는 지역주민의 신뢰와 만족을 필요로 하는데 이는 인구사회학적 특성과 지역적 특성을 고려해야 할 것이다. 그리고 생활환경 정책을 수행하는 지방정부 및 기관장의 의지와 지방정부의 자치적 조직들을 활용한 적극적 네트워크 활동도 필요하다. This study aims to present policy alternatives for the local government to adopt to address living environment crisis and its risk factors based on local residents’ policy awareness in Cheongju. It is found that risk perception had an impact on local residents’ satisfaction with local government’s environmental policies. Among others, the one with the largest explanatory power is the most critical crisis in the city such as yellow dust, fine dust, domestic wastes and other invisible living environment crisis. According to the results of this study, policy practices in response to living environment crisis should obtain local residents’ trust and satisfaction and thus consider their sociodemographic and regional characteristics. They also require strong dedication of the local governments and institutions responsible for implementing living environment policies and active networking activities among independent organizations within the local government.
An Analysis of Analytic Hierarchy Process for Inter-Korean Cooperation in Crisisonomy
Seol A Kwon,Sang Il Ryu,Young Ho Eom 위기관리 이론과 실천 2021 Journal of Safety and Crisis Management Vol.11 No.3
The Ministry of Unification, for alleviation of tensions between the two Koreas, is planning cooperation in the health and medical fields such as COVID-19 quarantine and preparation against disaster. The relative priorities were determined for the areas for inter-Korean joint cooperation and the method. The results are as follows: First, experts suggested that the inter- Korean disaster safety cooperation is more important in Inter-Korean exchange area such as Mt. Kumgang and Kaesong Industrial Complex compared to in Area requiring joint response Second, they suggested that the inter-Korean disaster safety cooperation is more important in Recovery-centered type such as contingency and earthquake compared to in Slow progression or Strong-response types. Third, they recognized that the inter-Korean disaster cooperation is more important in the urgent response type than in the Permanent dispatch type. Fourth, they suggested that, although it is more difficult to reach an agreement between the two Koreas, the form of supporting using both equipment and personnel from is more necessary in inter-Korean cooperation in disaster safety.
Panoramic video using scale-invariant feature transform with embedded color-invariant values
Kwon, Oh-Seol,Ha, Yeong-Ho IEEE 2010 IEEE transactions on consumer electronics Vol.56 No.2
<P>The resolutions offered by today¿s multimedia vary significantly owing to the development of video technology. For example, there is a huge gap between the resolution of cellular phones as small input devices and beam projectors as large output devices. Thus, panoramic video technology is one method that can convert a small resolution into a large resolution to lend realism and wide vision to a scene. Yet, transforming the resolution of an image requires feature or object matching based on extracting important information from the image, where the scale-invariant feature transform (SIFT) is one of the most robust and widely used methods. However, identifying corresponding points becomes difficult in the case of changing illumination or two surfaces with a similar intensity, as SIFT extracts features using only gray information. Therefore, this paper proposes a method of image stitching based on color-invariant features for automated panoramic videos. Color-invariant features can discount the illumination, highlights, and shadows in a scene, as they include the property of the surface reflectance independent of illumination changes. The effectiveness and accuracy of the feature matching with the proposed algorithm are verified using objects and illuminations in a booth, followed by panoramic videos.</P>