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X-Ray Sources with No Counterparts in Other Wavelength Bands
김철희,문병권,박홍수 한국천문학회 2014 Journal of The Korean Astronomical Society Vol.47 No.5
In order to identify peculiar X-ray sources, we select 442 sources with no counterparts in other wavelength bands (as of the year 1999) from the ROSAT All-Sky Survey Bright Source Catalog. We cross-correlate this initial list with the NASA/IPAC Extragalactic Database, the USNO and WISE catalogs, and the HEASARC XRAY Master Catalog. Eventually, we are left with four unidentified sources with no counterparts in other wavelength bands. We present these four sources and their X-ray properties in this paper.
김철희,장임석,김정수,Fan Meng,Mizuo Kajino,Hiromasa Ueda,Yuanhang Zhang,손혜영,Youjiang He,Jun Xu,Keiichi Sato,송창근,반수진,Tatsuya Sakurai,Zhiwei Han,Lei Duan,이석조,심상규,영선우,이태영 한국기상학회 2011 Asia-Pacific Journal of Atmospheric Sciences Vol.47 No.4
Three comprehensive acid deposition models were used to simulate the sulfur concentrations over northeast Asia over the period covering entire year of 2002, and discussed the aggregated uncertainties and discrepancies of the three models. The participating models are from the countries participating in the project of Longrange Transboundary Air Pollutants in Northeast Asia (LTP): China,Japan and Korea. The Eulerian Model-3/CMAQ (by China), Regional Air Quality Model (RAQM, by Japan), and Comprehensive Acid Deposition Model (CADM, by Korea) were employed by each country with common emissions data established by the administrative agencies of China, Japan and Korea. The episodic simulation results between 1 to 15, March 2002 are also presented, during which aircraft measurements were carried out over the Yellow sea. The episodic results show both a wide short-term variability in simulations against measurements, and maximum concentration differences of 3~5 times among the three models, requiring that further attention before confidence among the three models can be claimed for short-term simulations. However, the year-long cumulative simulations showed almost the same general features, with lower aggregated uncertainties between the three models, produced by the long term integration over northeast Asia.
김철희,Kim, Cheol-Hui 한국천문학회 1996 天文學論叢 Vol.11 No.1
In order to discover the candidates of emission-line galaxies towards Hydra Void, objective-prism observations using U.K. Schmidt Telescope were carried out. To search the emission feature of [0III]${\lambda}{\lambda}4959,5007$ for all objects on the plate, all observed prism plates were scanned with APM at the Royal Observatory and the copied direct R plates were scanned with PDS Microdensitometer operating in the Inter- University Center for National Science Research Facilities. By utilizing the "XIMTOOL" package, both spectral and direct images for the same field were displayed simultaneously on up and down windows separately. In case of distinct emission features for a certain object, corresponding direct object on the other window was examined through eyeballing to see whether this object is a galaxy. Through this procedure, we discovered in total 33 candidates of emission-line galaxies in a single field.
김철희 한국사회보장학회 2004 사회보장연구 Vol.20 No.1
고용보험 사업의 직업능력개발사업 중 직업훈현(실업자재취직훈련)과 실업급여 사업이 빈곤층의 재취업확률에 어느 정도 효과를 미치고 있는지를 살펴보기 위하여 빈곤층 중에서 직업훈련 참여자와 실업급여 수급자가 재취업으로 이행할 가능성을 해자드 모형과 가속실패시간 모형(AFT) 추정을 통하여 분석하였다. 분석 결과, 직업훈련 참여가 훈련시간, 훈련직종 등에서 모두 재취업 확률을 높이는 것으로 나타나 직업훈련이 빈곤층의 실업탈출에 큰 역할을 하는 것으로 나타났다. 실업급여의 경우에도 실업급여를 받는 경우에 재취업 확률이 높게 나타나 실업급여 또한 빈곤층의 재취업에 긍정적으로 작용하는 것으로 나타났다. 따라서 적극적 노동시장 정책의 일환으로 실시되고 있는 직업훈련과 실업급여제도가 확대되고, 빈곤층이 적극 참여하여 혜택을 받을 수 있도록 이들 계층의 자발적인 관심과 참여 노력은 물론 정부 차원에서도 정책적인 고려가 함께 이루질 필요가 있다는 사실을 발견할 수 있다. In a rapidly changing knowledge-based society, 'poverty' resulting from an increasing income-gap between the rich and the poor become more serious than before in Korea. With a deep concern about the impact of 1997 financial crisis on the poor by increasing rapidly unemployment problem and sudden economic condition shift, this thesis tried to analyze the effect of determinant factors on choosing economic activities of the poor and the impact of unemployment insurance program and job training programs which are the basis of the support system. Unemployment insurance DB were used for analyzing. The significant results of this analysis are summarized as follows. After analyzing a completing job [raining and receiving social benefit effect on the probability to be reemployed, it is possible to find that the participation in the job training is a significant dominant of increasing the probability to be reemployed. It also has an influence to raise the probability to be reemployed in a terms of training period training occupational classification. Thus, the job training seems to have a significant effect for the poor to access to labor market. And also, receiving unemployment benefit turned out to raise the probability to be reemployed. The unemployment benefit also has a positive effect on the reemployment of the poor. So, it is necessary for both the government and the poor themselves to make efforts to participate actively in the job training program and unemployment benefit program.
김철희,김민경,황남희 한국정책분석평가학회 2013 政策分析評價學會報 Vol.23 No.2
본 연구는 경제활동인구 근로형태별 부가조사를 이용하여 데이터 매칭기법을 통해 비정규직 교육훈련의 임금 및 정규직 전환효과를 추정하였다. 그 결과, 성향점수가중치를 이용한 비정규직 교육훈련의 임금효과는 4.3% 인 것으로 파악되었고, 교육훈련이 정규직 전환효과에는 통계적으로 유의하지 않는 것으로 나타났다.본 연구의 시사점은 비정규직 교육훈련의 성과제고 및 활성화 방안으로 제도·정책 개선을 통한 비정규직 교육훈련 기반 조성, 비정규직 교육훈련 인프라 구축, 교육훈련 프로그램의 특성화·다양화 지원 등을 제시하였다.
중증 재생불량성 빈혈 환자에서 신우신염에 대한 광범위항생제치료 중에 속발한 Saccharomyces cerevisiae 진균감염 1예
김철희,이정호,이정찬,강정현,곽상혁,배광봉,김현수,김종숙,조덕연,김삼용 충남대학교 의과대학 지역사회의학연구소 1999 충남의대잡지 Vol.26 No.1
Most patients with aplastic anemia who do not respond to immunosuppressive treatment or are not candidates for bone marrow transplantation die of infection or bleeding. The neutropenia in acute leukemia, aplastic anemia, or occurring subsequently to chemotherapy and bone marrow transplantation increases susceptibility to infection. In general, the number of infectious episodes correlate with the degree and duration of neutropenia. Global immunosuppression produced by conditioning for bone marrow transplantation or graft-versus-host disease, is associated with unusual bacterial and fungal pathogens, or serious viral and protozoan infections. In addition, repeated treatment with broad-spectrum antibiotics is associated with the emergence of resistant organisms and fungal diseases because of the altered microbial microenvironment of the host. The incidence of invasive fungal infection caused by Saccharomycetes eerevisiae in immunosuppressed patients is very rare, compared with that of infection by candida or aspcrgillus species. Cases of Saccharomycetes cerevisiae fungemia occurring in the course of treatment with broad-spectrum antibiotics are reported in patients with extensive burn or with prosthetic valve endocarditis. We experienced a case of urinary tract infection by Saccharomycetes cerevisiae in a 27-year old female patient with severe aplastic anemia. We report the case with a review of relevant literatures.