• 천문학회보
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• 제40권2호
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• pp.48.2-48.2
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• 2015

Galaxy Clusters with complex inner structures are excellent laboratories with which to study the properties of galaxies and the groups of galaxies in them. To execute a systematic search for flux-limited galaxy groups and clusters based on the spectroscopic galaxies with r < 17.77 of SDSS data release 12, we adopt a modified version of the friends-of-friends algorithm, whereupon a total of 3272 galaxy groups and clusters with at least 10 members are found. In this study, we aim to assign galaxy subgroups within groups and clusters that enable us to investigate the detained star-formation history of galaxies by applying a modified hierarchical grouping method to our galaxy group and cluster catalog. We note that roughly 70% of our galaxy groups and clusters have subgroups. The most remarkable additional results are as follows. The brightest cluster galaxies (BCGs) have brighter luminosities with larger velocity dispersions of groups and clusters. The BCGs are concentrated toward the most massive subgroups than the second and third one. This result implies that the galaxy properties can be affected by different merger and star-formation histories for differing environments.

• 한국지진공학회논문집
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• 제25권2호
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• pp.83-91
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• 2021

Seismic designs for Korean nuclear power plants (NPPs) under earthquakes' design basis are noticed due to the recent earthquake events in Korea and Japan. Japan has developed the technologies and experiences of the NPPs through theoretical research and experimental verification with extensively accumulated measurement data. This paper describes the main features of the design-time history complying with the Japanese seismic design standard. Proper seed motions in the earthquake catalog are used to generate one set of design time histories. A magnitude and epicentral distance specify the amplitude envelope function configuring the shape of the earthquake. Cumulative velocity response spectral values of the design time histories are compared and checked to the target response spectra. Spectral accelerations of the time histories and the multiple-damping target response spectra are also checked to exceed. The generated design time histories are input to the reactor building seismic analyses with fixed-base boundary conditions to calculate the seismic responses. Another set of design time histories is generated to comply with Korean seismic design procedures for NPPs and used for seismic input motions to the same reactor containment building seismic analyses. The responses at the dome apex of the building are compared and analyzed. The generated design time histories will be also applied to subsequent seismic analyses of other Korean standard NPP structures.

• 한국문헌정보학회지
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• 제42권3호
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• pp.61-79
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• 2008

본 연구는 해외 소장 고문헌의 DB구축과 공동활용 방안을 다루기 위해 해외 소장 고문헌의 정리. 해외 소장 고문헌 DB 시스템의 문제점 및 개선방안. 해외 소장 고문헌의 공동활용 방안을 다룬 것이다. 본 연구를 통해 밝혀진 사실은 다음과 같다. 해외 소장의 고문헌을 정리하기 시작한 것은 국립중앙도서관이 1982년부터 해외기관에 소장된 고문헌을 영인하여 간략목록으로 발행하는 차원에서 시작되었다. 려강출판사가 일본소재 한국고문헌목록 1-4를 발간하여 기초자료로 제공하였다. 국립문화재연구소는 일본, 미국. 프랑스 등의 해외기관에 소장된 고문헌을 조사하여 일부의 목록집을 발행하였고. 국사편찬위원회는 일본소재 고문서 목록을 조사하고 그중 가치 있는 것을 선별하여 목록으로 간행하였다. 해외 소장 고문헌의 DB 시스템에서는 국립중앙도서관의 한국고전적종합목록시스템, 국립문화재연구소의 해외소장한국전적문화재시스템, 국사편찬위원회의 한국사데이터베이스시스템 및 NF목록/원문서비스시스템의 특성이 기술되었고, 각 DB상의 문제점이 파악되었으며 그에 대한 몇 가지 대안도 제시되었다. 공동활용 방안에 있어서는 고문서 정리를 위한 목록 형식 덴 기술(시안)은 새로운 표준안으로 채택될 수 있도록 수정되어야 하고, 관련 기간들은 서지기록을 작성하거나 원문 텍스트를 디지타이징할 때 표준을 준수해야 한다. 고문헌의 DB 구축과 관리를 위한 전문 인력의 양성과 교육이 이루어져야 한다. 긍극적으로는 디지털화된 자원의 공유를 위한 기술개발, 고문헌 컨텐츠의 이용과 개선, 공공의 이용과 참여, 국제적이 이용이 가능하도록 할 수 있는 국가차원의 전담기구가 설립되어야 한다.

• 천문학회보
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• 제37권2호
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• pp.81-81
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• 2012

Since the ultraviolet (UV) flux of an integrated population is a good tracer of recent star formation activities, UV observations provide an important constraint on star formation history (SFH) in galaxies. We present UV color-magnitude relations (CMRs) of early-type dwarf galaxies in the Virgo cluster, based on Galaxy Evolution Explorer (GALEX) UV data and the Extended Virgo Cluster Catalog (EVCC, Kim, S. in prep.). The EVCC covers an area 5.4 times larger (750 deg2) than the footprint of the classical Virgo cluster catalog by Binggeli and collaborators. We secure 1304 galaxies as members of the Virgo cluster and 526 galaxies of them are new objects not contained in the VCC. Morphological classification of galaxies in the EVCC is based on the optical image ("Primary Classification") and spectral feature ("Secondary Classification") of the SDSS data. We find that dwarf lenticular galaxies (dS0s) show a surprisingly distinct and tight locus separated from that of ordinary dwarf elliptical galaxies (dEs), which is not clearly seen in previous CMRs. The dS0s in UV CMRs follow a steeper sequence than dEs and show bluer UV-optical color at a given magnitude. Most early type dwarf galaxies with blue UV colors (FUV-r < 6 and NUV-r < 4) are identified as those showing spectroscopic hints of recent or ongoing star formation activities. We explore the observed CMRs with population models of a luminosity-dependent delayed exponential star formation history. The observed CMR of dS0s is well matched with models with relatively long delayed star formation. Our results suggest that dS0s are most likely transitional objects at the stage of subsequent transformation of late-type progenitors to ordinary red dEs in the cluster environment. In any case, UV photometry provides a powerful tool to disentangle the diverse subpopulations of early-type dwarf galaxies and uncover their evolutionary histories.

• 한국도서관정보학회지
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• 제42권2호
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• pp.257-276
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• 2011

이 연구의 목적은 국립중앙도서관의 '한국고전적종합목록시스템'과 국사편찬위원회의 '한국역사정보통합시스템' 이라는 두 고서 관련 정보 시스템의 검색 인터페이스 기능과 특성을 비교 및 분석하는 것이다. Breeding의 OPAC 표준 기능성 체크리스트를 사용하여 검색 관련 열한 개 항목을 네 개 범주로 나누어 분석한 결과, 키워드 검색, 질의에서 불리안 연산자 사용, 시대순 결과 정렬, 초기 단어 재입력 않고 탐색 수정 가능, 결과 집합 내 검색, 및 개별 도서관이나 장소로 결과 제한 가능 등 여섯 개 기능성은 두 시스템 모두 제공하였으나, 저자, 서명, 주제 브라우즈와 현재 세션의 검색 이력 보기와 불러오기는 두 시스템 다 제공하지 않았다. 이들은 OPAC의 표준 기능성 및 차세대 OPAC 기능성 반영, 이용자 요구와 정보추구행태의 심층적 분석, 주제 접근성 강화 등이 시급한 것으로 나타났다.

• 천문학회보
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• 제35권2호
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• pp.41.2-41.2
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• 2010

We present ultraviolet (UV) properties of dwarf galaxies in the Ursa Major cluster comparing with those in the Virgo cluster. We have constructed SDSS DR7/GALEX GR5 matched optical/UV catalog for dwarf galaxies with various morphologies in these two clusters. Membership of galaxies belonging to the Ursa Major cluster was made by hierarchical grouping method using SDSS spectroscopic data. We classified morphologies of dwarf galaxies using the combination of visual inspection of the images and spectral features returned from SDSS data. In contrast to the case of the Virgo cluster, majority of dwarf galaxies in the Ursa Major cluster lies in the blue cloud of the UV color-magnitude relations (CMRs) implying strong recent or on-going star formation. We discuss the cluster environment on the star formation history and evolution of dwarf galaxies.

• 천문학회보
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• 제42권2호
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• pp.46.1-46.1
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• 2017

Late-type galaxies falling into a cluster would evolve being influenced by the interactions with both the cluster and the nearby cluster member galaxies. Most numerical studies, however, tend to focus on the effects of the former with little work done on those of the later. We thus perform numerical study on the evolution of a late-type galaxy falling radially toward the cluster center interacting with neighbouring early-type galaxies, using N-body, hydrodynamical simulations. Based on the information about the typical galaxy encounters obtained by using the galaxy catalog of Coma cluster, we run the simulations for the cases where a Milky Way Galaxy-like late-type galaxy, flying either edge-on or face-on, experiences six consecutive collisions with twice more massive early-type galaxies having hot gas in their halos. Our simulations show that the evolution of the late-type galaxy can be significantly affected by the high-speed multiple collisions with the early-type galaxies, such as on the cold gas content and the star formation activity, particularly through the hydrodynamic interactions between the cold disk and the hot gas halos. By comparing our simulation results with those of others, we claim that the role of the galaxy-galaxy interactions on the evolution of late-type galaxies in clusters could be comparable with that of the galaxy-cluster interactions, depending on the dynamical history.

• 한국도서관정보학회지
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• 제44권3호
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• pp.359-378
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• 2013

이 연구는 판권기의 기능과 역할을 정리하고 중국에서 발행하는 도서의 판권기 변천사, 관련 법률, 기재요소 등을 살펴보았다. 중국의 도서 판권기를 살펴보면, 판권기에 공통적으로 들어가는 내용은 판권보호와 판본기록을 기재하고 있는 것이다. 판권기는 당해 도서의 서지사항을 특정한 곳, 즉 표제지 이면에 모아서 기재한 것이다. 그런데 이 판권기에 기술되는 서지사항은 출판기술의 발전과 출판환경의 변화에 따라 필요한 서지사항들이 추가로 기재되고 있다. 이 판권기는 도서관에서 목록을 작성할 때 유용한 정보원으로 제공되고 있다.

• 기록학연구
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• 제1호
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• pp.137-188
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• 2000

Korea was highly successful in maintaining a strong tradition of record preservation. However, Japanese imperialism and the Korean war over this century has seen a huge quantity of these once plentiful records either destroyed or relocated overseas. Many of Korea records remain in the custody of foreign archival institutions. Additionally, many records of foreign states concerned with korean affairs, for example, records of the Department of state, in the U.S.A., are of great relevance to Korean modern history. These records which exist in foreign countries are a necessary and invaluable resource in the advancement of Korea studies. After the 1980s, as research interest in Korean modern history increased gradually, much historical material related to Korea was extensively introduced, removed, collected from the U.S.A., Japan, Russia and China etc. by the efforts of pioneering scholars and institutions. Several attempts at collating and publishing this material have been made. Despite this encouraging result, individual scholars and institutions's efforts face problems in relation to removal of records. Firstly, it is repeated nonproductively to remove and collect the same records, for we didn't establish a comprehensive information system, through which the condition of foreign record removal and management is able to be administrated. Secondly, there is no system for arrangement, preservation, use of removed records. For example, finding aids, such as inventory, register, description, isn't prepared for user. A user may usually not understand an accurate context of their creation, preservation removal. Thirdly, almost institution has arranged the removed records among other materials and books. Each institution has a different classification criteria, too. These conditions seem to make a difficulty in national management. This study investigated how the materials for Korea history which has been removed from foreign countries should be managed for effective preservation and use. For these purpose, we investigated the present conditions of removal and management of these materials. Also, we investigated examples of the foreign state, U.S.A. and Japan to have a idea for removal and management policy. Then, This study propose a establishment of information network system as management policy. To administrate removing and managing records effectively, an idea that records belong to the public should be accepted commonly. The policy for management of the record is followings. Firstly, unification of classification is necessary. The records which were removed from foreign countries had better to be classified according to their origins of states and institutions. Secondly, Finding aids should be prepared for user. There are many accession aids such as catalog, register, inventory for user in archives. This will be a efficient method for management. When a record is removed, a card for description of contents must be composed. Thirdly, a digital input and network system establishment is necessary. It will help to manage a condition of removed records. A digital input and management system establishment is not just a project of digitalizing records. At present, various finding aids need to be introduced to make a database for records and archives. An search using only 'search engine' may make a difficulty in finding materials because such method is apt to have too much or little result. So, classification, arrangement, description, response-service should be integrated in these system. The recent technical advancement give a opportunity to realize this idea. Above all, these procedure should be archival process.

• 한국도서관정보학회지
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• 제26권
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• pp.131-168
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• 1997

The future of a country is influenced by the youth. Sound fostering of the youth is important for the country's future. Because of mechanization, industrialization and urbanization of our society, many social problems, such as confusion of the sense of value, dehumanization, money worshi n.0, ppings, juvenile delinquency are increasing. For the solution of problems of juvenile crime and dehumanization, bibliotherapy should be practiced in juvenile reformatories, schools and societies. The purpose of this study is to investigate the effectiveness and value of reading. And also the characteristics, brief history, principles and procedures of bibliotherapy are examined. In addition, the book catalog suitable for bibliotherapy is considered. The results of the study are as follows. (1) In order to solve the problem of dehumanization, and the confusion of the sense of value among young adults, we should enrich and cultivate the characters of young adults through the bibliotherapy. So, bibliotherapy for the treatment of human nature of juveniles should be practiced in the juvenile reformatories, schools and societies. (2) The values of reading in the past were inspiration, information and recreation. But, in recent times, the interest in therapeutic value of reading is increasing. (3) Bibliotherapy is a kind of psychotherapy using selected reading materials. A n.0, pplication scopes of bibliotherapy are very wides, including mental medicine, alcoholic poisoning, drug addiction, juvenile delinquency, counselling and education for school life, etc. (4) The principles of bibliotherapy consist of identification, catharsis, insight and it has self therapeutic principles through the reading. The procedures of bibliotherapy is similar to any other kind of psychotherapy: the participant's statement, diagnosis, treatment, continuous recognition of remedial value. (5) The well suited reading materials for bibliotherapy are literature and biography. Literature and biography are familiar to everyone, because they describe the mentalities, emotions and life styles of human beings. (6) The standard reading lists for bibliotherapy for the proper guidance of juvenile delinquency should be prepared for the solution of developmental tasks, such as, drinking, smoking, friendship, family, love, money, marriage, pregnancy, violence, etc. Finally, Bibliotherapy should be introduced to our school settings and corrections institutions for the proper guidance and prevention of the malpractice of the youths. In addition, we should be endeavor to develop the standard reading lists for bibliotherapy and case study.