• 한국멀티미디어학회:학술대회논문집
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• 한국멀티미디어학회 2003년도 추계학술발표대회(하)
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• pp.984-989
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• 2003

최근 인터넷에서 문서 포맷의 기준으로 XML이 각광을 받고 있으며 XML schema를 통하여 DTD에서는 할 수 없었던 부분을 할 수 있게 되었다. 또한 e-카탈로그에서 XML 문서의 사용이 급증하면서 XML 문서의 설계가 점차 복잡해지고 XML schema 설계가 DTD보다 한층 더 복잡하게 되었기 때문에 XML schema 모델링이 중요한 문제로 대두 되었다. 이에 본 논문에서는 복잡한 XML 문서를 체계적이고 구조화하기 위하여 XML 문서를 UML로 설계하고 UML 모델링 정보를 변질과 누락 없이 추출하기 위하여 REI를 이용하여 UML 모델링 정보를 추출하여 XML로 변환하였다.

• 한국전자거래학회:학술대회논문집
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• 한국전자거래학회 2004년도 e-Biz World Conference
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• pp.302-309
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• 2004

·Catalogs -information about products and services -Contents ＋ Classification Schema ＋ Operational Issues ·What do we do with them？ -[Schulten, et a;, 2001] ‥Narrow down search for complete set of applicable products ‥Comprehend individual description to the precision needed -Support other applications that use product information ‥SCM, ERP, e-Procurement, etc. ·Catalog Management System -Design, storage, navigation ＆ retrieval, transformation, communication, publication(omitted)

• 한국정보과학회논문지:데이타베이스
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• 제32권2호
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• pp.111-119
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• 2005

전자카타로그는 상품에 관한 풍부한 의미를 포함하며 온톨로지가 적용될 여지가 높은 영역이다. 온톨로지는 사물의 본질과 사물간의 관계를 나타내는데, 전자카탈로그를 형식적(formal)인 온톨로지로 표현하는 것은 전자상거래 영역에서 중요하다. DL(Description Logic)은 현재 사용되는 여러 온톨로지 언어의 이론적 기반을 제공한다. 본 논문은 DL 언어를 사용해 전자카타로그를 형식적으로 온톨로지 모델링 한다. 기본적인 모델링 구성요소 집합은 화장 개체 관계(Extended Entity Relationship)로 개념적으로 나타내고, DL 언어로 대응해서 변환한다. EER로 나타낼 수 없는 부가적인 의미적 지식은 직접 DL언어로 표현한다. 논문에서 제시하는 모델링 언어는 언어의 표현력과 복잡도를 고려할 때, 현실적으로 추론에 적합하다고 알려져 있는 SHIQ(d) 언어 범위에 기반하고 있다. 모델링한 온톨로지 e-카타로그의 활용 이해를 돕기 위해 시나리오를 제시하고, 실제 DL 추론 도구를 통해 그 시험적 검증을 한다.

• 천문학회보
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• 제38권2호
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• pp.47.1-47.1
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• 2013

We present structural parameters of galaxies in the Extended Viro Cluster Catalog (EVCC), new catalog of galaxies in the Viro cluster using homogeneous Sloan Digital Sky Survey (SDSS) Date Release 7 (DR7) data. The EVCC covers more extended region of the Viro cluster than of the Virgo Cluster Catalog (VCC) and presents updated morphologies of galaxies using multi-band images and spectral features. We obtain the surface brightness profiles of galaxies using ellipse task in IRAF. Based on the analysis of surface brightness profile we construct a catalog of various structural parameters of galaxies, i.e. central surface brightness, effective radius, sersic index, effective surface brightness, and mean effective surface brightness. Taking advantage of these structural parameters in various parameter spaces, we refine criteria of dividing giant elliptical and dwarf elliptical galaxies. In addition, we found that bulge dominated galaxies have larger sersic index and brighter central surface brightness than disk dominated galaxies. At fixed magnitude, dwarf elliptical galaxies dwarf lenticular galaxies, and dwarf irregular low surface brightness (LSB) galaxies show larger effective radii than giant elliptical galaxies, giant lenticular galaxies, and irregular high surface brightness (HSB) galaxies, respectively. Dwarf elliptical galaxies and dwarf irregular LSB galaxies occupy the similar structural parameter spaces. We suggest that giant elliptical galaxies and dwarf elliptical galaxies may have different origin.

• 천문학회보
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• 제36권2호
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• pp.69.1-69.1
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• 2011

While the Virgo Cluster Catalog (VCC) is well established catalog from deep photographic plate survey, with available survey data recently released (e.g., SDSS), it can be further updated concerning the membership and morphology of galaxies. While membership and morphology of galaxies included in the VCC are based on the single band imaging data, thanks to the multi-color imaging and spectroscopic observations of SDSS, we are able to revise the membership and morphology of sample galaxies in the fields of the Virgo cluster. We present a new catalog of galaxies in the Virgo cluster using SDSS DR7 data, the extended Virgo cluster catalog. Using SDSS imaging and spectroscopic data, we introduce two kinds of galaxy classifications which are complementary each other. In addition to traditional morphological classification by visual inspection of the images ("Primary Classification"), we also attempt to classify galaxies with the spectroscopic features ("Secondary Classification"). The primary classification is basically based on the scheme of galaxy morphological classification of VCC. The secondary classification relies on the SED shape and presence of emission/absorption lines returned from SDSS. Our morphological classifications allow to study the evolution and associated star formation histories of galaxies in the Virgo cluster.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2002년도 봄 학술발표논문집 Vol.29 No.1 (A)
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• pp.325-327
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• 2002

인터넷을 통한 상품 구매는 이젠 언제 어디서나 쉽게 달 수 있는 현상이다. 또한 각종 쇼핑몰과 경매 사이트의 출현으로 소비자는 보다 쉽고 광범위하게 상품을 구매할 수 있게 되었다. 이러한 인터넷 환경속에서 다양한 형태의 정보 자원의 존재는 상품구매의 다양성 측면에서 바라볼 때는 큰 장점이 될 수 있지만 각 사이트마다의 개별적인 카탈로그 정보의 소유로 사용자가 원하는 형태의 상품구매를 위해선 같은 상품이라 할 지라도 끊임없는 시간적 투자와 노력을 들어야만 하는 불편함이 있었다. 이제 더 이상 각 업체만의 고유 카탈로그 정보를 보유할 필요가 없다. 이에 본 연구에서는 표준화되고 정형화된 카탈로그 시스템을 통해 상품 정보를 가져오고 제공된 네트워크 구조의 검색 시스템을 통해 판매자에게 원하는 물품을 제공하는 E-Catalog 시스템 모델을 설계하여 CRM(Customer Relation Management)을 지원하는 효율적인 Marketplace를 이루는데 방향을 두고자 한다.

• 천문학회보
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• 제37권1호
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• pp.58.1-58.1
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• 2012

We present a comprehensive re-analysis of stellar photometric variability in the field of open cluster M37, using our new high-precision light curves. This dataset provides a rare opportunity to explore different types of variability between short (-minutes) and long (-one month) time-scales. To investigate the variability properties of -30,000 objects, we developed new algorithms for detecting periodic, aperiodic, and sporadic variability in their light curves. About 7.5% (2,284) of the total sample exhibits convincing variations that are induced by flares, pulsations, eclipses, starspots and, in some cases, unknown causes. The benefits of our new photometry and analysis package are evident. The discovery rate of new variables is increased by 63% in comparison with the existing catalog of variables, and 51 previously identified variables were found to be false positives resulting from time-dependent systematic effects. Based on extended and improved catalog of variables, we will review the basic properties (e.g., periodicity, amplitude, type) of the variability and how different they are for different spectral types and for cluster memberships.

• Journal of Astronomy and Space Sciences
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• 제33권3호
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• pp.147-166
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• 2016

A radio-quiet γ-ray pulsar is a neutron star that has significant γ-ray pulsation but without observed radio emission or only limited emission detected by high sensitivity radio surveys. The launch of the Fermi spacecraft in 2008 opened a new epoch to study the population of these pulsars. In the 2^nd Fermi Large Area Telescope catalog of γ-ray pulsars, there are 35 (30 % of the 117 pulsars in the catalog) known samples classified as radio-quiet γ-ray pulsars with radio flux density (S₁₄₀₀) of less than 30 μJy. Accompanying the observations obtained in various wavelengths, astronomers not only have the opportunity to study the emitting nature of radio-quiet γ-ray pulsars but also have proposed different models to explain their radiation mechanism. This article will review the history of the discovery, the emission properties, and the previous efforts to study pulsars in this population. Some particular cases known as Geminga-like pulsars (e.g., PSR J0633+1746, PSR J0007+7303, PSR J2021+4026, and so on) are also specified to discuss their common and specific features.

• 시스템엔지니어링학술지
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• 제1권1호
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• pp.26-31
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• 2005

In order to care about preserving the environment for future generations, each country has been required to make the laws of the environment. So manufacturers must design, manufacture and sell goods that meet customer's need and must do this while meeting the needs of the environment. In this research we have developed product structure and configuration management system that treats electronic catalogs for recycling of train parts. This research focused on two system. One is JAVA-based electronic catalog that give the information about recycling of train parts. The other is product structure and configuration management system based on electronic catalog and Bill of Materials(B.O.M).

• 천문학회보
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• 제45권1호
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• pp.50.2-50.2
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• 2020

The dark matter (DM) only simulations have been exploited to study e.g. the large scale structures and properties of a halo. In a baryon side, the high-resolution hydrodynamic simulation such as IllustrisTNG has helped extend the physics of gas along with stars and DM. However, the expansive computational cost of hydrodynamic simulations limits the size of a simulated universe whereas DM-only simulations can generate the universe of the cosmological horizon size approximately. I will introduce a pipeline to estimate baryonic properties of a galaxy inside a dark matter (DM) halo in DM-only simulations using a machine trained on high-resolution hydrodynamic simulations. An extremely randomized tree (ERT) algorithm is used together with multiple novel improvements such as a refined error function in machine training and two-stage learning. By applying our machine to the DM-only simulation of a large volume, I then validate the pipeline that rapidly generates a galaxy catalog from a DM halo catalog using the correlations the machine found in hydrodynamic simulations. I will discuss the benefits that machine-based approaches like this entail, as well as suggestions to raise the scientific potential of such approaches.