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.

지방정부의 생활환경위기 정책 비교분석

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.

An Empirical Analysis of Women s Perception on Safety Culture and Disaster Vulnerability

Seol A Kwon,Jae Eun Lee 위기관리 이론과 실천 2020 Crisisonomy Vol.16 No.6

This study empirically examines the vulnerability of the community and the perception of the women’s safety culture in order to realize a community that is safe from disaster. The purpose of this paper is to analyze empirically the women’s perception on safety culture and community vulnerability to disasters. The analytical results are as follows. First, according to the safety awareness scores, women tended to have higher risk perception than men. Second, the safety awareness scores by disaster type indicated that their risk perception was highest for man-made disasters. Third, disaster vulnerabilities were mostly found in women s living space, decision-making, demand responsibility, information accessibility, caregiver role, body, and resource accessibility. In short, gender differences appeared in perception on safety culture and disaster vulnerability in decision-making field.

A Study on Support Systems for Jellyfish Damage in Korea Due to Global Warming

Seol A Kwon,Jee Eun Kim 위기관리 이론과 실천 2013 Journal of Safety and Crisis Management Vol.3 No.2

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.

A study on a new method for flexoelectric coefficient estimation of the flexoelectric unimorph sensing element

Seol Ryung Kwon,노용래 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.5

In the flexoelectric sensing element using the bending mode, the estimation of the flexoelectric coefficient was investigated using 3-D stress/strain analysis and experiments. The proposed method uses the results (deformation and strain) from the finite element analysis (FEA). The estimated flexoelectric coefficients were compared with those obtained via the conventional method (Euler’s beam theory) under the assumption of the quasi 1-D stress field. The results show that the RMS value and standard deviation of the estimated flexoelectric coefficient for the 3-D stress-field case of the sensing element are 31.51 µC/m and 0.24 %, respectively. In addition, it is found that the flexoelectric coefficient obtained from the results of the 3-D stress analysis is 1.8 % smaller than that of the quasi-1-D stress analysis. Therefore, in order to obtain a more reliable flexoelectric coefficient in the sensing element, the results of the 3-D numerical stress analysis should be used for accurate estimation of the flexoelectric coefficient.

Direction of DISASTER Management Sys-tem Reform in Preparation for Unified KOREA

Kwon Seol a,Ryu Sang il J-INSTITUTE 2018 International Journal of Human & Disaster Vol.3 No.2

Various efforts are needed in preparation for the predictable Korea unification as a wind of peace blown over the Korean Peninsula brought about the long-terminated exchange between South Korea and North Korea. As bilateral relationship and exchanges are actively done, systematic and specific system needs to be established to manage highly uncertain disasters more efficiently. It is particularly important to establish the comprehensive and integrated disaster management operation system for the unified peninsula after the declaration of the end of war as bilateral relations are abruptly improved and inter-Korean exchange and cooperation continues. This study aims to elevate the tolerance in response to the unification and propose improvements of disaster safety system in the course of cooperation between the government and private institutions. Disaster management system needs to be reformed considering legalization related with research results, disaster term standardization, manual generalization, and regional characterization. It would be desirable to build up disaster management and response system starting from regions such as boundary areas, economic cooperation areas, and exchange areas not by setting a diverse range of disasters and selecting areas in hope of proper cooperation of the further inter-Korean disaster management system.

Measures for Strengthening Performance of DISASTER and Safety Management System at Local Government

Kwon Seol a,Ryu Sang-il J-INSTITUTE 2019 International Journal of Human & Disaster Vol.4 No.1

This study aims to analyze the present local government status systematically and establish practical disaster and safety management system of the local government. Rural area is composed of small business farm commu-nity with people engaged in primary industry. The disaster occuring in rural area includes both social disaster and natural disaster. Urban area is differentiated from rural area in aspect of industrial composition, administration, and facility. The disaster occurring in urban area includes both social disaster and natural disaster. In adminis-trative district aspect, urbanrural complex area refers to city which connects urban and rural area spatially. Met-ropolitan area is a concept contrast to basic local government. Also, current workers for disaster prevention de-partment are insufficient compared to quota. In addition, excessive number of residents is assigned per worker at disaster department. The work hours of workers at disaster department exceeds average work hours at the local government.

Safety Measure for Overcoming Fire Vulnerability of Multiuse Facilities - A Comparative Analysis of Disastrous Conflagrations between Miryang and Jecheon -

Seol A Kwon,Jae Eun Lee,Yong Un Ban,Hae-Jin Lee,Sungeun You,Hyun Jung Yoo 위기관리 이론과 실천 2018 Crisisonomy Vol.14 No.5

우리사회는 지속성장 추구로 경제성장을 이뤘다. 하지만 그 이면에는 금전만능주의로 인한 사회적 무책임, 안전불감증, 무사안일주의로 대형 안전사고와 인재가 끊임없이 발생하고 있다. 이러한 불확 실성 사회에서 우리는 안전하고 건강한 미래사회를 위한 위기관리 시스템의 근본적인 변화와 노력 이 필요하다. 본 연구는 거듭되는 대형화재 참사 발생의 근본적인 화재취약성을 분석하고자 제천 스포츠센터 화재 참사와 밀양 세종병원 화재참사의 사례를 비교분석하였다. 연구결과 물리적 요인, 경제적 요인, 사회적 요인, 환경적 요인에서 모두 화재 취약성 요소들이 발견되었으며, 이에 대한 화재안전 대책 방안으로는 물리적 요인의 한계인 불법건물 증축, 소방안전시설 점검에 대한 처벌 및 법제도의 강화, 화재취약성 감소를 위한 경제적 요인으로는 재난관리 인력 증원, 사회적 요인은 위기관리커뮤니케이션의 개선과 재난약자에 대한 실태조사와 분석을 통한 실제적인 방재대책 마련, 환경적 요인에서의 해결방안으로 안전불감증, 무사안일주의, 느슨한 행정규제의 해소가 필요를 제시하였다. Severe fire vulnerability was revealed during the occurrence of repeated massive fire accidents such as the 2017 Jecheon fire and the 2018 Miryang hospital fire. The analysis and comparison of these cases confirmed that fire vulnerability factors were found in all physical, economic, social, and environmental factors. As the physical strategy for fire safety, this study demonstrated the needs to strengthen the legal punishment system, enforce thorough inspection of fire safety facilities and prevent illegal building extension. The economic strategy for reducing fire vulnerabilities includes the increase in personnel for disaster management. The social strategy focuses on improving risk management communication and preparing a practical alternative for disaster prevention by surveying and analyzing the disaster vulnerable. As for the environmental strategy, it proposes the resolutions of safety negligence, ostrich policy, and lax administrative regulations.

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>