• 한국멀티미디어학회논문지
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• 제3권1호
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• pp.41-52
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• 2000

본 논문에서는 인터넷 쇼핑몰에서 구매자가 효과적으로 상품을 검색할 수 있는 상품 검색 지원 에이전트를 설계하고 구현하였다. 기존 쇼핑몰에서의 전자 카탈로그는 주제별 또는 검색어에 의한 상품 정보를 제공하거나 상품구매 이력에 관한 구매 정보를 구매자에게 제시하였다. 본 논문에서는 보다 효과적인 구매 정보를 제공하기 위해 기존 구매자의 탐색 패턴을 분석하여 이를 근거로 하여 구매하려는 상품과 관련된 상품 정보를 제시해 주는 상품 검색 지원 에이전트를 개발하였다. 따라서 구매자는 구매하려는 상품과 관련된 정보를 보다 효과적으로 얻을 수 있어 효율적인 쇼핑을 즐길 수 있을 것이다.

• 한국정보시스템학회지:정보시스템연구
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• 제13권1호
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• pp.161-177
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• 2004

In the catalogs that have presently been under research, the product information cannot be represented in a classified form but it also fails to be well defined, lacking the description of detail information for various products on a systematic fashion. And the product information is duplicated on its representation. In this study, an implementing model is to be proposed to analyze and classify the information that can be in use of describing various products, and to describe an integrated products information for various types of products while making up for the weak points of presently available researches. Also, this study shows that it is possible for the proposed model to represent various units of product information with presently proposed model applied to computers and book products in high demand of transaction, and by implementing electronic catalogues in the existing researches to prove its efficiency.

• 한국CDE학회논문집
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• 제12권2호
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• pp.109-117
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• 2007

Three-dimensional mesh models have been widely used in various applications such as simulations, animations, and e-catalogs. In such applications the normal vectors of mesh models are used mainly for shading and take up the major portion of data size and transmission time paper over networks. Therefore a variety of techniques have been developed to compress them efficiently. In this paper, we propose the MOEC (Modified Octree Encoding Compression) algorithm, which allow multi lever compression ratios for 3D mesh models. In the algorithm, a modified octree has nodes representing their own positions and supporting a depth of the tree so that the normal vectors are compressed up to levels where the shading is visually indistinguishable. This approach provides efficient in compressing normals with multi-level ratios, without additional encoding when changing in compression ratio is required.

• 한국주거학회논문집
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• 제13권4호
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• pp.53-60
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• 2002

The purpose of this study is to provide the guidelines for the planning and design of officetels, meeting the requirements of life in one-person household which is a new type in housing market. Literature survey is used as a research method. We analyzed the needs of officetel residents, by reviewing researches and by examining internet homepages and catalogs of 20 officetels sold since 2000. Case study analysis method is used as a qualitative analysis. The major findings of this study are as follows; 1) In dwelling unit space, it lacks the independence of working space and the privacy of living space. Therefore, the provision of various unit plans, such as 2-bay plan, unit with mezzanine floor or movable walls, layout of kitchen and dining area in window side, is proposed. 2) In communal space, it lacks the consideration of natural environments and the systematic maintenance. Therefore, the introduction of communal workshop and conference rooms and of various types of garden space, is proposed.

• 천문학회보
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• 제41권2호
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• pp.53.2-53.2
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• 2016

We present our experiences with open-source spatio-temporal database systems for managing and analyzing big astronomical data acquired by wide-field time-domain sky surveys. Considering performance, cost, difficulty, and scalability of the database systems, we conduct comparison studies of open-source spatio-temporal databases such as GeoMesa and PostGIS that are already being used for handling big geographical data. Our experiments include ingesting, indexing, and querying millions or billions of astronomical spatio-temporal data. We choose the public VVV (VISTA Variables in the Via Lactea) catalogs of billions measurements for hundreds of millions objects as the test data. We discuss issues of how these spatio-temporal database systems can be adopted in the astronomy community.

• 천문학논총
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• 제7권1호
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• pp.9-17
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• 1992

The power spectrum of the galaxy distribution is accurately measured up to wavelengths over $100\;h^{-1}$ Mpc from the CfA 1 and 2 catalogs. We find that our results agree with power spectra calculated by others from smaller samples of optical, radio and infrared galaxies. The power spectrum of an open CDM model (${\Omega}h$ = 0.2 and ${\delta}_8$ = 1; see below for definitions) best approximates the observed power spectrum. The power spectrum of the standard COM model (${\Omega}h$ = 0.5 and ${\delta}_8$ = 1) is inconsistent with the observed one at the 99% confidence level. Our best estimation of the corresponding correlation function in real space is ${\xi}(r)\;=\;(r/6.2h^{-1}Mpc)^{-1.8}$ for r < $20h^{-1}$ Mpc.

• 천문학회보
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• 제37권1호
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• pp.57.2-57.2
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• 2012

We present a survey for finding hidden star clusters using the WISE data. There are more than two thousand star clusters in the current catalogs of star clusters in the Milky Way Galaxy. However, there are still numerous star clusters remaining to be discovered, especially, along the Milky Way. The WISE, NIR to MIR all sky survey, is an efficient source to find star clusters obscured by dust along the Milky Way. Taking the advantage of the power of WISE, we survey a wide area at ${\mid}l{\mid}<30^{\circ}$ and ${\mid}b{\mid}<6^{\circ}$, toward to the central region of the Milky Way to find new star clusters. To find cluster candidates, we used two kinds of method: the visual inspection and the brightness density investigation. We will report the progress of this survey.

• 천문학회보
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• 제42권2호
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• pp.88.3-89
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• 2017

We present our experiences with open-source NoSQL database systems in analyzing spatial and temporal astronomical data. We conduct experiments of using Redis in-memory NoSQL database system by modifying and exploiting its support of geohash for astronmical spatial data. Our experiment focuses on performance, cost, difficulty, and scalability of the database system. We also test OpenTSDB as a possible NoSQL database system to process astronomical time-series data. Our experiments include ingesting, indexing, and querying millions or billions of astronomical time-series measurements. We choose our KMTNet data and the public VVV (VISTA Variables in the Via Lactea) catalogs as test data. We discuss issues in using these NoSQL database systems in astronomy.

• 천문학회보
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• 제42권1호
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• pp.53.4-53.4
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• 2017

With large-volume surveys becoming the norm, it is increasingly important to accurately model the galaxy-halo connection and being able to create mock universes of galaxies - starting from dark matter halo catalogs - that reproduce with high-fidelity all the characteristics of a given experiment. This step is necessary, in order to safely interpret cosmological data and fully control systematic effects. We are developing a new Python-based tool which integrates several existing packages and allows one to reproduce many of the forms used to describe galaxy-halo models, ranging from halo occupation distribution (HOD) to abundance matching techniques, along with the characteristics of a given survey and the main testable observables. We are making the code parallel for high-performance parallel-architectures.

• 한국멀티미디어학회논문지
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• 제6권6호
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• pp.945-952
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• 2003

B2B의 전자상거래의 발달로 상품 정보를 효과적으로 표현하고, 이러한 정보를 회사들간에 교환하기 위한 디지털 카탈로그는 점차 그 중요성이 인식되고 있다. 본 논문은 상품들을 통합하여 효과적으로 표현할 수 있는 통합 상품 표현 모델을 참조하고, 이 모델을 Oracle 8i에서 제공하는 XDK(XML Development Kit)를 사용하여 구현한다. 먼저, 상품 표현 모델을 XML DTD로 표현하고, 이 DTD로 표현된 KML상품 정보를 효과적으로 Oracle 8i에 데이터베이스에 저장하고 검색하는 시스템을 구축한다. 마지막으로, 구축된 시스템에 대한 실행 예제를 보여준다.