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Discharge characterization of two-region arc plasma (TRAP) ion source
이기현,정승호,김태성,장대식,허성렬 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.9
The Korea Atomic Energy Research Institute (KAERI) is developing a novel Two-Region Arc Plasma Ion Source (TRAP) as a negative hydrogen (deuterium) ion source for a Neutral Beam Injection (NBI) system in a fusion tokamak. The TRAP ion source is based on a two-region configuration, comprising a high energy electron region that creates highly vibrationally excited molecules and a low electron temperature region that generates negative ions by attaching electrons to molecules. This configuration can be achieved by optimizing the filament position and magnetic cusp field. In order to optimize the TRAP configuration, the plasma parameters are investigated under various operating conditions, such as filament position, gas pressure, and arc power. Electron density and temperature are determined using Langmuir probe measurements. In this paper, the detailed experimental results are described and discussed
한중관계 30년 평가와 미래발전에 대한 소고 -구동존이를 넘어 화이부동으로-
이기현 한중사회과학학회 2022 한중사회과학연구 Vol.20 No.3
The purpose of this paper is to diagnose the 30-year history of Korea-China relations from a political and diplomatic perspective, analyze the challenges and constraints faced, and present directions for future development. Since the establishment of diplomatic relations, Korea-China relations have continued to develop throughout all fields of politics, economy, and social culture under the principle of Qiudongcunyi(求同存異). Korea and China have become major trade partners each other, and human exchanges have diversified, multilayered, and diversified. Politically, it has developed into a strategic cooperative partnership that operates a security dialogue channel. Of course, it is not without conflict and crisis. They failed to narrow the gap in perception to solve the North Korean nuclear issue and experienced the THAAD crisis. Recently, mutual public sentiment has deteriorated due to social and cultural conflicts. Moreover, the current structural reality can be a constraint on the future development of Korea-China relations. As the global U.S.-China strategic competition intensifies, the decoupling phenomenon of economy, security, values, and ideology can cause unintended misunderstandings and antagonism between the two countries. Economic relations are also becoming more competitive than complementary, and traditional conflict issues such as North Korea’s nuclear test, missile provocations, and the Korea-U.S. alliance can worsen geopolitical and geoeconomic risks on the Korean Peninsula Nevertheless, the development of Korea-China relations is important. This is because China is a geographically adjacent country and has exerted great influence in all aspects of political diplomacy, economic trade, and social culture throughout its long history. Both Korea and China form a consensus on the importance of economic and political and diplomatic partnerships and stable future development. Even if the structural reality at hand is difficult, it is time to face up to the differences and find a way for Huaerbutong(和而不同) to discuss how to respect, coordinate, or overcome them. 본 논문은 한중관계 30년의 역사를 정치외교적 시각에서 진단하고, 직면한 도전과 제약요인들을 분석하여, 미래발전을 위한 방향을 제시 하는 것을 목적으로 한다. 한중관계는 수교 이후 상호 공통의 이해 추구를 중시하는 구동존이(求同存異)의 원칙하에 정치, 경제, 사회문화 전 분야에 걸쳐 발전을 거듭해 왔다. 한중 양국은 상호 주요 무역 파트너가 되었고, 인적 교류는 다양화, 다층화, 다원화되었다. 정치적으로도 안보대화 채널을 가동하는 전략적협력적 동반자 관계로 발전하였다. 물론 갈등과 위기가 없었던 것은 아니다. 북핵 문제 해결을 위한 인식의 차이를 좁히지 못했고, 사드 사태를 경험하기도 하였다. 최근에는 김치, 한복등 사회문화 갈등으로 인해 상호 국민감정이 악화되기도 하였다. 더구나 현재의 구조적 현실은 한중관계의 미래발전에 제약이 될 수 있다. 글로벌 차원의 미중 전략 경쟁이 심화되면서, 경제, 안보, 가치⋅이념의 디커플링 현상이 양국 간에 의도치 않은 오해와 반목을 발생시킬 수 있다. 경제관계도 상호보완성보다는 상호경쟁성이 부각되고 있고, 북한의 핵실험과미사일 도발, 한미 동맹 등 전통적인 갈등 이슈는 한반도의 지정학, 지경학적 리스크를 더욱악화시킬 수 있다. 그럼에도 불구하고, 한중관계의 발전은 중요하다. 중국은 지리적으로 인접한 국가이고, 오랜 역사를 통해 정치외교, 경제무역, 사회문화 모든 방면에서 큰 영향력을 발휘해왔기 때문이다. 또한 한중 양국 모두 경제적, 정치외교적 파트너쉽의 중요성과 안정적인 미래발전에 대해 공감대를 형성하고 있다. 비록 당면한 구조적 현실이 어렵다 하더라도 이제는 서로다름에 대해 직시하고, 이를 어떻게 상호존중, 조율하고, 혹은 극복할 것인지를 논하는 화이부동(和而不同)의 길을 모색해야 할 것이다.
Impact of Wildfire Smoke Exposure on Health in Korea
이기현,오성수,정경숙,안연순,장세진,홍세화,강대룡,김성경,고상백 연세대학교의과대학 2022 Yonsei medical journal Vol.63 No.8
Purpose: The characteristic topography and climate often affect the occurrence of large-scale wildfires in the Eastern Gangwon-doregion of Korea. However, there are no studies on the health effects of these wildfires in Korea. This study aimed to analyze the dif ferences in medical use between a wildfire-affected area and an adjacent non-affected area before and after a wildfire in 2019 inGangwon-do, Korea. Materials and Methods: We used medical usage data from the Korean National Health Insurance Corporation. Rates of medicaluse were determined for citizens of a wildfire-affected area in the Eastern Yeongdong region and a non-affected area in the West ern Yeongseo region. Logistic regression analysis was performed considering an increase in medical use per individual as a de pendent variable; age, sex, income, smoking, drinking, and exercise were included as confounding variables. Results: The odds ratio for medical use in Yeongdong region increased significantly after 3 days, 3 months, and 1 year after a fireoccurred, compared with Yeongseo region. Conclusion: The results of this study confirmed that the use of medical care increased for residents of a wildfire-affected area,compared with those of an adjacent non-affected area. This is the first study on the relationship between wildfires and inpatientmedical use in Korea.
프로젝트 활동에 의한 수업방법이 유아의 수학성취에 미치는 효과
이기현 한국유아교육학회 2000 유아교육연구 Vol.20 No.2
본 연구는 프로젝트 활동에 의한 수업방법이 유아의 수학성취에 미치는 효과를 검증함으로써, 유치원의 실제 수학교육의 방향을 제시해 보고자 하였다. 연구대상은 경북 K시의 T유치원 5세(71개월) 유아로 실험집단 12명 통제집단 20명이었으며 프로젝트 활동은 1999년 9월 14일부터 12월 1일까지 11주 동안 평균 주2회 정도로 총 26회 실시하였다. 결과는 The Psychological Corporation에서 제작한 SESAT-2(Stanford Early Achievement Test-2 ; 1992)의 수학성취 검사 도구에 의해 측정되었다. 연구결과 실험집단과 통계집단간에는 수학성취의 하위영역(수개념, 문제해결, 기하, 측정)중에서 수개념은 통계적으로 유의미한 차이가 나타났으나, 문제해결, 기하, 측정은 두 집단간 차이가 나타나지 않았다. This study is an effort to redirect kindergarten mathematical education through analyzing the effects of the Project Approach on young children's mathematical achievement. The instrument used to measure young children's mathematical achievement was SEAT-2 (Stanford Early Achievement Test-2, 1992) devised by the Psychological Corporation. The project activity was "Soccer", which was practiced about twice a week for 11 weeks (from September 14 to December 1, 1999), each practice took thirty minutes to one hour thirty minutes according to the situations. The subjects who were five-year-old (71-month-old) children in a kindergarten located in K city in Kyungbook province were divided into a control group (20 children) and an experimental group (12 children). The data analyzed by ANCOVA show the following results: In terms of the concepts of numbers among the four sub-areas of the mathematical achievement (concepts of numbers, problem-solving, geometry, measurement), there was a significant statistical difference between the two groups, while in terms of the other three areas there were no statistical significant differences.