• Title/Summary/Keyword: 스키마버전

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Accessibility to Instances Regardless of Versions in Schema Evolution Environments in Object-Oriented Databases (객체지향 데이터베이스의 스키마진화 환경에서 버전에 무관한 인스턴스 접근)

  • Jin, Min
    • The Transactions of the Korea Information Processing Society
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    • v.6 no.3
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    • pp.553-561
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    • 1999
  • The facility of schema evolution is necessary in object-oriented database applications. There exist several versions of schema and instances created under different versions of the schema concurrently in the database. This base proposes a mechanism for supporting accessing instances regardless of versions of the schema in schema evolution environments in object oriented databases. There is trade-off between the flexibility of schema modification operations and the system overhead for supporting such schema modifications. Access handling routines are provided to the undefined attributes in each version of the class. Access handling routines are also defined for each pair of semantics rather than defining backdate/update functions for each pair of versions of a class. Thus, this mechanism supports the change of semantics with reduced user and system overhead.

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Development of a Hierarchical HydroG-OneFlow Web Services of River GeoSpatial Information (하천공간정보의 계층적 HydroG-OneFlow 웹서비스 개발)

  • Shin, Hyung Jin;Hwang, Eui Ho;Chae, Hyo Sok;Hong, Sung Soo
    • Proceedings of the Korea Water Resources Association Conference
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    • 2015.05a
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    • pp.626-626
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    • 2015
  • 본 연구에서는 하천공간정보의 웹서비스를 위해 SOAP(Simple Object Access Protocol) API 및 REST(Representation State Transfer) API로 제공하는 HydroG-OneFlow 웹서비스를 개발하였다. HydroG-OneFlow는 GML 기반의 서비스를 제공하며 GetBasin, GetGeoVariable 및 GetData 등의 기본서비스로 구성된다. GML은 GIS S/W의 벡터 GML 포맷과 공간정보 오픈플랫폼 서비스인 브이월드 데이터 API에서 제공하는 GML 포맷을 참고하여 하천공간 벡터정보를 제공할 수 있도록 GML을 구성하였다. GDM 공간 데이터에 대한 벡터정보 ML 수용 수준을 향상시킬 수 있도록 벡터구조의 점, 선, 면 정보에 대하여 GML의 PointPropertyType, CurvePropertyType, SurfacePropertyType을 도입하였다. 또한 일반적인 공간자료에서는 Multi 객체에 대한 지원도 필요하다. 현 GDM 데이터베이스에서도 OGC 표준의 MultiPoint, MultiLineString, MultiPolygon을 지원하고 있다. 이를 위하여 GML의 상응 요소인MultiPointPropertyType, MultiCurvePropertyType, MultiSurfacePropertyType을 하천공간정보 벡터 스키마에 도입하여 활용하였다. 클라이언트 서버 통신은 메시지 교환프로토콜인 SOAP을 사용하여 서버의 객체를 직접 호출하여 이루어진다. 서버는 서버의 제공 서비스를 WSDL(Web Service Description Language)를 통하여 게시하고 클라이언트는 이 기준(Criteria)을 참고하여 접근한다. GetData의 경우 Type(GRID or VECTOR), GDM(Geospatial Data Model) 여부(true or false), LayerName, BasinID, GenTime을 인자로 받아 GeoData에서 검색된 정보를 반환한다. SOAP버전은 1.1과 1.2를 지원하여 접근하는 클라이언트에서 선택할 수 있도록 개발하였다.

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A Study on METS Design Using DDI Metadata (DDI 메타데이터를 활용한 METS 설계에 관한 연구)

  • Park, Jin Ho
    • Journal of the Korean Society for information Management
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    • v.38 no.4
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    • pp.153-171
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    • 2021
  • This study suggested a method of utilizing METS based on DDI metadata to manage, preserve, and service datasets. DDI is a standard for statistical data processing, and there are currently two versions of DDI Codebook (DDI-C) and DDI Lifecycle (DDI-L). In this study, the main elements of DDI-C were mainly used. First the structures and elements of METS and DDI-C were first analyzed. And the mapping of the major elements of METS and DDI-C. The standard was finally taken as METS, the format to express it. Since METS and DDI-C do not show a perfect 1:1 mapping, the DDI-C element that best matches each element of the standard METS was selected. As a result, a new dataset management transmission standard METS using DDI-C metadata elements was designed and presented.

An Analysis of Correlation Between Metacognition and Digital Library Searching Behavior

  • Heesop, Kim;Aluko Ademola, Mayokun
    • Journal of the Korea Society of Computer and Information
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    • v.28 no.3
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    • pp.75-82
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    • 2023
  • The main purpose of this study is to analyze the metacognition of digital library search behavior of college students and to provide a fundamental data for the designing a user-centered online information retrieval system to find more optimal search results. In order to achieve the purpose of this study, metacognition was classified into the five main categories, including schema-training, planning, monitoring, evaluation, and transfer, and a total of twenty subcategories were included. A total of 112 students participated in the online questionnaire. The collected data were analyzed using SPSS version 26, and it was found that there was a significant correlation between metacognition of college students and their digital library searching behavior. In particular, the digital library search experience was found to be the strongest factor to be considered as the most important variable in digital library design based on the aspect of user metacognition.

Enhancing Project Integration and Interoperability of GIS and BIM Based on IFC (IFC 기반 GIS와 BIM 프로젝트 통합관리 및 상호 운용성 강화)

  • Kim, Tae-Hee;Kim, Tae-Hyun;Lee, Yong-Chang
    • Journal of Cadastre & Land InformatiX
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    • v.54 no.1
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    • pp.89-102
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    • 2024
  • The recent advancements in Smart City and Digital Twin technologies have highlighted the critical role of integrating GIS and BIM in urban planning and construction projects. This integration ensures the consistency and accuracy of information, facilitating smooth information exchange. However, achieving interoperability requires standardization and effective project integration management strategies. This study proposes interoperability solutions for the integration of GIS and BIM for managing various projects. The research involves an in-depth analysis of the IFC schema and data structures based on the latest IFC4 version and proposes methods to ensure the consistency of reference point coordinates and coordinate systems. The study was conducted by setting the EPSG:5186 coordinate system, used by the National Geographic Information Institute's digital topographic map, and applying virtual shift origin coordinates. Through BIMvision, the results of the shape and error check coordinates' movement in the BIM model were reviewed, confirming that the error check coordinates moved consistently with the reference point coordinates. Additionally, it was verified that even when the coordinate system was changed to EPSG:5179 used by Naver Map and road name addresses, or EPSG:5181 used by Kakao Map, the BIM model's shape and coordinates remained consistently unchanged. Notably, by inputting the EPSG code information into the IFC file, the potential for coordinate system interoperability between projects was confirmed. Therefore, this study presents an integrated and systematic management approach for information sharing, automation processes, enhanced collaboration, and sustainable development of GIS and BIM. This is expected to improve compatibility across various software platforms, enhancing information consistency and efficiency across multiple projects.