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일본 오이타현 우스키 마애불상군의 환경변화와 염풍화 특성
조지현,이찬희,Cho, Ji Hyun,Lee, Chan Hee 대한자원환경지질학회 2020 자원환경지질 Vol.53 No.6
우스키 마애불상군의 모암은 아소-4 화산쇄설암층군에 속하는 암회색 응회암이다. 이 불상군은 상부에서 유입되는 강수와 지반에서 상승하는 지하수로 인한 백화현상과 암반의 토양화가 상당히 진행되어 보존대책이 시급한 상태였다. 불상군 표면 염풍화의 주요 원인인 백색오염물에서는 세나다이트, 석고, 백운석이 동정되었다. 이들의 용출실험 결과, 세나다이트는 교반초기에 용해되었다가 4시간 이후 재용출되고, 석고는 2시간 교반까지 검출되다가 4시간 교반 후 용해되는 특성을 보였다. 백색오염물의 재결정 환경을 파악하기 위해 11개월간 미기후 환경을 모니터링한 결과, 봄철에는 세나다이트와 미라빌라이트의 상전이가 넓게 나타나고, 여름과 가을철에는 고온으로 인해 수용액 상태로 유지된다. 겨울철에는 온도가 하강하면서 미라빌라이트의 분포대가 가장 넓게 도시된다. 따라서 석불군 일대의 수분 이동통로를 차단하고 보호각 내에서 유지되는 다습한 환경을 제어하기 위한 초정밀 관측이 요구된다. The host rock of the Usuki Stone Buddha Statues is dark gray welded tuff involved the Aso-4 pyroclastic flow sediments. This Buddha Statues are processing chlorosis from rainfall flowing above and underground water which were urgently needed for conservation measurement. White precipitates, the main source of salt weathering, on the surface of the Buddha Statues are mainly consisted of thenardite, gypsum and dolomite. Extraction experiment result shows that thenardite was dissolved at the beginning of stirring and then redissolved after 4 hours, and gypsum was detected until stirring for 2 hours, and then dissolved after stirring for 4 hours. As a result of monitoring the microclimate environment for 11 months to determine the recrystallization environment of white precipitates, the phase transition between thenadite and mirabilite appears widely in spring, and is maintained in an aqueous solution due to high temperatures in summer and fall. In winter, mirabilite is shown the widest by decreasing temperature. Therefore we requires details monitoring for blocking water transfer port and solved humidity environment in shelter.
연구논문(硏究論文) : 노후소득보장제도연구 -연금크레딧을 중심으로-
조지현 ( Ji Hyun Cho ) 단국대학교 법학연구소 2011 법학논총 Vol.35 No.1
This article analyze the welfare needs of the elderly that presented as a category of new social risk with the advent of post-industrial society. There happens the change of the employment model, family model and the weakening of welfare states in the post-industrial society. The point is that it brings about the various categories of new social risks; youth unemployment, poverty of women, suffering from child-bearing. In addition to these risks, the elderly become one of the new social risk bearer. The purpose of this study is to suggest the elderly income guarantee policy. The one is policy alternatives for childcare credit in National pension which strengthens current childbirth credit. In order to suggest policy alternatives for childcare credit, care credit on other countries are compared. The other is unemployment credit. Unemployment credit system is a system to protect members who would have trouble in their silver years due to unemployment. When Korea adopts the unemployment credit system in its national pension, it is expected that the blind spot would decrease.
열회수에 따른 고온 태양열 열화학 싸이클의 수소 생산에 관한 연구
조지현(Cho Ji-Hyun),서태범(Seo Tae-Beom) 한국태양에너지학회 2017 한국태양에너지학회 논문집 Vol.37 No.2
Two-step water splitting thermochemical cycle with CeO2/ZrO2 foam device was investigated by using a solar simulator composed of 2.5 kW Xe-Arc lamp and mirror reflector. The hydrogen production of CeO2/ZrO2 foam device depending on heat recovery of Thermal-Reduction step and Water-Decomposition step was analyzed, and the hydrogen production of CeO2/ZrO2 and NiFe2O4/ZrO2 foam devices was compared. Resultantly, the quantity of hydrogen generation increased by 52.02% when the carrier gas of Thermal-Reduction step is preheated to 200°C and, when the N2/steam is preheated to 200°C in the Water-Decomposition step, the quantity of hydrogen generation increased by 35.85%. Therefore, it is important to retrieve the heat from the highly heated gases discharged from each of the reaction spaces in order to increase the reaction temperature of each of the stages and thereby increasing the quantity of hydrogen generated through this.
조지현(Ji Hyun Cho) 한국체육교육학회 2013 한국체육교육학회지 Vol.18 No.2
본 연구는 1988년 서울올림픽 유치를 통한 한국사회에서의 엘리트스포츠 현상 및 문제점 등 을 분석한 다. 특히, 엘리트스포츠와 정치, 경제, 그리고 사회와의 관계 및 스포츠정책의 현실과 문제점을 알아보는데 목적을 갖고 있다. 연구방법으로는 질적 연구를 통한 인터뷰 및 자료를 수집하여 실시하였고, 인터뷰대상자 들은 한국사회에 대한 이해도가 높고 영향력을 갖고 있는 정치가, 문화체육관광부 장관, 스포츠 정책가, 저널리스트 그리고 대학교수들을 중심으로 심층면담을 (구조화, 반구조화) 실시하였다. 연구결과로는 1980년대 서울올림픽을 기점으로 현재까지 한국 엘리트스포츠는 매가스포츠 이벤트 유치 및 정부의 전폭적 지원 아래 지속적으로 발전해왔으나, 스포츠정책 시스템 문제 및 선수들이 직면하고 있는 다양한 문제점들이 나타났다. 이에 따라 본 연구결과는 미래 한국엘리트스포츠 발전을 위한 새로운 정책시스템 필요성 및 운동선수 들에게 현실적으로 활용될 수 있는 교육과 진로대책마련의 중요성을 시사하고 있다. This study aims to investigate the consequences of hosting the 1988 Seoul Olympic Games on the provision of elite sport in South Korea which, during the past twenty-five years since the Games, has developed significantly. The project adopted qualitative methods, drawing on interview data with a number of prominent South Korean politicians, diplomats, journalists, and academics, illuminating several important aspects of South Korea`s sport policy, elite sport development, and related problems. In addition, the study emphasises that South Korea`s elite sport system needs to develop and be re-evaluated in order to identify a clear path for the South Korean sporting future.
유한요소법을 이용한 골절치료용 임플란트 시스템 형상설계에 관한 연구
조지현(Ji-Hyun Cho),서금희(Keum-Hee Seo),서태일(Tae-il Seo) 한국생산제조학회 2012 한국생산제조학회지 Vol.21 No.3
This paper investigates shape design processes of two implant systems for bone fracture treatment ; Bone plate and Interlocking nail system. These systems can directly fix fractured human bones by surgical operations. The bone plates consist of various shaped plates and implant screws for fixation of fractured human bones with various manual instruments allowing to handle them. The material corresponds to titanium alloy Ti6Al4V because it is harmless material for human body as well as significantly rigid. This system has to be suitably rigid as well as manually bended in orthopedic surgery operations. The Interlocking nail system is a kind of nail implanted inside fractured human bones. The shapes of these systems have to be suitably designed in order to endure various loads as well as avoid any damages. If various shaped prototypes would be fabricated and tested to design the optimal shapes, optimal shapes could be obtained but very long time and expensive costs must be required. In this paper finite element method was applied into these systems. Under various boundary conditions a series of structural analysis was conducted by using ANSYS. Finally important shape factors could be determined on the basis of the analysis results.