• The KIPS Transactions:PartD
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• v.11D no.2
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• pp.259-268
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• 2004

For supporting Interoperability among heterogeneous data sources in different geographic information systems, it is required to use open API like OGIS OLE DB Proposed in OGC. The OLE/COM Implementation Specification of OGIS only provides interfaces to discover and access spatial data, but does not support interfaces for updating distributed spatial data. To solve this problem, we propose and add interfaces for updating spatial objects distributed over heterogeneous data sources and examining the consistency of spatial relationships between updated objects. We also devise a 2-phase commit protocol based on spatial relationships in order to guarantee the consistency of updated objects. To justify the update scheme using the proposed Interfaces and 2-phase commit prototype we design and implement a prototype system for updating distributed spatial objects.

• 한국공간정보시스템학회:학술대회논문집
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• 1999.06a
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• pp.95-106
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• 1999

많은 지리자료에 대한 효율적이고 효과적인 검색 및 다양한 지리자료 데이터 포맷에 대한 데이터 변환에 드는 비용을 최소화하기 위해 지리자료의 공유, 즉 상호운용(Interoperability)에 대한 필요성이 제기되었으며 이를 위한 표준의 하나로 OpenGIS라는 표준이 만들어지고 있다. OpenGIS는 기존의 표준과는 다른 광범위하고 미래지향적인 특징으로 인해 실질적인 GIS 표준으로 자리잡아 가고 있는 실정이지만, 국내에서는 OpenGIS 구현명세에 대한 체계적인 연구 및 여러 GIS 서버를 대상으로 한 실제구현 사례가 거의 없는 실정이다. 이 논문에서는 컴포넌트 기반의 분산환경에 가장 근접해 있는 OpenGIS OLE/COM 구현명세에 대한 분석을 통해 Gothic, MGE, Oracle에 적용하기 위한 OGIS 데이터 제공자의 설계 및 이를 바탕으로 상호운용을 달성하기 위한 OpenGIS 미들웨어의 설계를 제시한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.10a
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• pp.65-68
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• 2001

서로 다른 GIS 서버의 공간 데이터를 동일한 방법으로 접근하기 위한 개방형 GIS 에 관심이 커지고 있다. 서로 다른 서버간의 상호 운용성을 효과적으로 지원하기 위해서는 데이터제공자를 통한 공간 데이터 모델의 변환이 필수적이므로, 방대한 공간 데이터의 변환과 전송으로 인한 사용자 응답 시간의 지연 문제가 우선 해결되어야 한다. 이 논문에서는 OGIS 데이터소비자에서 효과적인 버퍼 관리를 통해 사용자 응답 시간의 지연 문제를 해결한다. 이 논문에서 제시하는 버퍼 관리 전략은 전체 레이어에 대해서 통합적으로 메모리를 관리하고 각 레이어별로 공간 인덱스를 생성 관리함으로써 데이터 접근 속도를 개선하였다. 제안한 버퍼 관리 전략은 OGIS 데이터소비자인 Mapbase 컴포넌트를 통해 구현함으로써, 데이터 접근 속도의 개선을 입증하였다.

• 한국공간정보시스템학회:학술대회논문집
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• 1998.07a
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• pp.173-180
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• 1998

GIS데이터와 함께 고해상도 원격영상데이터의 활용을 높이기 위한 영상데이터의 표준화에 관한 연구가 추진중이다. 본 연구에서는 ISO/TC와 OGC 등을 비롯한 해외 영상데이터의 표준화 사례를 분석하였으며 국내의 표준화 추이를 살펴보았다. 이러한 분석의 결과를 바탕으로 가장 보편적이고 사용이 용이한 영상데이터의 표준안이 제시되도록 하였다.

• Journal of Korea Spatial Information System Society
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• v.1 no.1 s.1
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• pp.57-67
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• 1999

Two GIS and/or OGIS issues for ITS interoperability have been proposed and reviewed with some implications to Korean setting. They are location referencing and ITS map datum. The former must support ITS communication and data sharing. Therefore, an introduction of location referencing and other related issues have been addressed along with the Oak Ridge National Lab.'s (ORNL) location referencing scheme. The latter, proposed by ORNL, is a planned network of anchor points across the nation, that could potentially serve as a positional reference for ITS application (Gottsegen, 1997). It is composed of a set of nodes and links in a standard non-plannar network at a coarse scale for the entire nation for referencing purposes. To provide case of real time traffic information and to guarantee the seamless interoperability, we do need to develop the core ITS map datum as a national infrastructure, and the location referencing scheme should also be either developed or borrowed and localized to meet the domestic needs. Some institutional issues are also addressed along with the future research agenda.

• Proceedings of the Korean Vacuum Society Conference
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• 2012.02a
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• pp.470-470
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• 2012

Organic thin film transistors (OTFTs) backplane constitute the active elements in new generations of plastic electronic devices for flexible display. The overall OTFTs performance is largely depended on the properties and quality of each layers of device material. In solution based process of organic semiconductors (OSCs), the interface state is most impediments to preferable performance. Generally, a threshold voltage (Vth) shift is usually exhibited when organic gate insulators (OGIs) are exposed in an ambient air condition. This phenomenon was caused by the absorbed polar components (i.e. oxygen and moisture) on the interface between OGIs and Soluble OSCs during the jetting process. For eliminating the polar component at the interface of OGI, the role of high vacuum seasoning on an OGI for all solution processable OTFTs were studied. Poly 4-vinly phenols (PVPs) were the material chosen as the organic gate dielectric, with a weakness in ambient air. The high vacuum seasoning of PVP's surface showed improved performance from non-seasoning TFT; a $V_{th}$, a ${\mu}_{fe}$ and a interface charge trap density from -8V, $0.018cm^2V^{-1}s^{-1}$, $1.12{\times}10^{-12}(cm^2eV)^{-1}$ to -4.02 V, $0.021cm^2V^{-1}s^{-1}$, $6.62{\times}10^{-11}(cm^2eV)^{-1}$. These results of OTFT device show that polar components were well eliminated by the high vacuum seasoning processes.

• Proceedings of the KSRS Conference
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• 2002.10a
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• pp.860-879
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• 2002

Traditionally, Geographical Information Systems can only process spatial data in a procedure-oriented way, and the data can't be treated integrally. This method limits the development of spatial data applications. A new and promising method to solve this problem is the spatial structural query language, which extends SQL and provides integrated accessing to spatial data. In this paper, the theory of spatial structural query language is discussed, and a new geographical data model based on the concepts and data model in OGIS is introduced. According to this model, we implemented a spatial structural query language G/SQL. Through the studies of the 9-Intersection Model, G/SQL provides a set of topological relational predicates and spatial functions for GIS application development. We have successfully developed a Web-based GIS system-WebGIS-using G/SQL. Experiences show that the spatial operators G/SQL offered are complete and easy-to-use. The BNF representation of G/SQL syntax is included in this paper.

• Proceedings of the KSRS Conference
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• 2002.10a
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• pp.880-884
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• 2002

According to the development of computer technology, especially in 3D graphics and visualization, the interest for 3D GIS has been increasing. Several commercial GIS softwares are ready to provide 3D function in their traditional 2D GIS. However, most of these systems are focused on visualization of 3D objects and supports few analysis functions. Therefore in this paper, we design not only a spatial operation processor which can support spatial analysis functions as well as 3D visualization, but also implement a prototype to operate them. In order to support interoperability between the existing models, the proposed spatial operation processor supports the 3D spatial operations based on 3D geometry object model which is designed to extend 2D geometry model of OGIS consortium, and supports index based on R$^*$-Tree. The proposed spatial operation processor can be applied in 3D GIS to support 3D analysis functions.

• The KIPS Transactions:PartD
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• v.11D no.1
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• pp.203-210
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• 2004

A new research of geographic information system has been focused on an open architecture, interoperability and extensibility in their design. In order to process huge data, multidimensional data and heterogeneous geographic format data, these research move away from monolithic system to open structure system managing application layer and user interface layer. Nowadays, many developers have used CORBA middleware for the OGIS systems. However, CORBA middleware has some problems that support only a point-to-point communication and takes a long time to transfer sever data to client. Thus, in this paper, we propose a method on modifying a point-to-point communication and implement the efficient communication method. The proposed method that transfer data from sever to client in one connection support a group communication and reduce a transfer time delay.

• Spatial Information Research
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• v.7 no.2
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• pp.175-190
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• 1999

Recently , as GIS technology is rapidly improved and stabilized, there are some needs to reuse pre-developed and powerful GIS technology. GIS standardization based on components and open interfaces becomes a way to solve those reusability of previous GIS technology. This GIS standardization currently focuses on building the GIS Data Infrastructure that is being deployed globally. Especially, OpenGIS consortium which is mainly made up of international GIS leading vendors is announcing some GIS abstract specifications and implementation specifications. This study focuses on how could we design and implement the OLE/COM-based data provider component based on various DBMS or file systems, how could these data provider components be used for enterprise UIS(Urban Information Systems) and how could various formatted GIS data be shared in one system. Also some problems practically caused by an implementation process of data provider component are listed up and some solutions are given. Furthermore, design and analysis of UML(Unified Modeling Language) was reformed through the data provider component development task and this UML methodology is able to indicate a standardized model for newly developed data provider component.