• 한국측량학회:학술대회논문집
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• 한국측량학회 2010년 춘계학술발표회 논문집
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• pp.207-208
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• 2010

In this paper, we carried out calibration of laser scanning MMS(Mobile Mapping System) using Lynx Mobile Mapper, a new MMS developed at Optech Incorporated. Laser scanning MMS could be defined as an integration of several subsystems. Subsystems are composed of laser scanner, gps receiver and antenna, INS(Inertial Navigation System), DMI(Distance Measurement Instrument). These are obtained 3D spatial information by direct-georeferencing technology. To obtain 3D spatial information, calibration of laser scanning MMS is required prior to operation system, it is similar to airborme lidar system. 145 checkpoints were used to accuracy estimation. The accuracy results are about 5cm(RMSE) for calibration in all directions(east, north, ellipsoidal height).

• Spatial Information Research
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• 제20권5호
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• pp.91-98
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• 2012

본 연구는 BIM과 GIS간 상호운용성을 위해 외부 BIM 참조 모델을 제안한다. 이를 위해 BIM과 GIS간 상호운용성과 관련된 연구 현황과 유즈케이스들을 조사하였다. 그리고 이러한 상호운용성 지원을 위한 CityGML 모델 확장을 위해 IFC와 CityGML의 구조를 분석하였다. 이런 결과를 바탕으로 IFC로부터 CityGML로 맵핑하는 규칙을 정의한 메타 데이터를 포함한 외부 BIM 참조 모델을 제안하였다.

• Spatial Information Research
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• 제3권1호
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• pp.19-27
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• 1995

논문에서 다룰 시스템은 영상 처리를 이용한 전처리과정에서 사용자에게 필요한 정보를 얻은 뒤 이 자료를 상호교류적으로 입력하는 반자동 지도입력시스템이다. 영상 처리는 주로 중요한 정보의 하나인 외곽선 추출에 주력하였고 이를 위해 적응성 평활화 필터와 연결보존외곽선추출를 사용하였다. 외곽선 정보는 편집기에서 벡터화 하며 편집의 효율을 높이기 위해 내부 자료구조는 확장된 사진트리 구조를 사용하였다. 이러한 작업들은 그 특성에 따라 개인용 컴퓨터와 워크스테이션에 각각 분담시켰고 네트웍을 통해 저장기기를 공유하여 작업의 일관성및 단순화를 추구하였다.

• 지구물리
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• 제6권2호
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• pp.89-97
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• 2003

For safety evaluation of a rockfill dam, it is often necessary to investigate spatial distribution and dynamic characterization of weak zones such as fractures. For this purpose, both seismic and electric methods are adopted together in this research. The former employs the multichannel analysis of surface waves (MASW) method, and aims at the mapping of 2-D shear-wave velocity (Vs) profile along the dam axis that can be associated with dynamic properties of filled materials. The latter is carried out by DC- resistivity survey with a main purpose of mapping of spatial variations of physical properties of dam materials. Results from both methods are compared in their signature of anomalous zones. In addition, downhole seismic survey was carried out at three points within the seismic survey lines and results by downhole seismic survey are compared with the MASW results. We conclude that the MASW is an efficient method for dynamic characterization of dam-filling materials, and also that joint analyses of these two seemingly unrelated methods can lead to an effective safety evaluation of rock-fill dam.

• 한국멀티미디어학회논문지
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• 제18권8호
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• pp.950-959
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• 2015

The necessity of an empirical study on how projection mapping videos are evaluated from consumers' point of view has arisen, as they can lead to visual pollution if factors including spatial characteristics around the structure and details of the contents are not taken into consideration. This study aims to evaluate projection mapping videos and elucidate the question on whether evaluation criteria positively influence the satisfaction level or not. Above all, five evaluation criteria including artistry, creativity, identity, immersion and usefulness were deducted and a hypothesis from preceding research "each evaluation criteria will positively(+) influence the satisfaction level of projection mapping video" has been established. In order to test the hypothesis, big domestic department stores which screened projection mapping videos were selected and a verification experiment has been conducted with ordinary citizens as subjects. In the result of the experiment, among the five evaluation criteria, artistry, creativity, and usefulness were chosen, while identity and immersion were dismissed. The result verifies that if useful information is provided in forms of interesting contents produced with distinctive ideas and creative methods, it will satisfy the consumers as attractive public design.

• 한국산업정보학회논문지
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• 제27권3호
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• pp.1-10
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• 2022

웹 기술의 발전과 함께 대량의 웹 문서들이 생산되고 있다. 이 웹 문서에는 다양한 공간적 텍스트들을 포함하고 있으며, 이 텍스트들을 공간정보로 변환함으로서 공간질의로 텍스트 문서를 검색할 수 있는 기반이 된다. 이러한 공간 텍스트들에는 행정지명이나 관심 지역(POI)이름 뿐만이 아니라 우편번호나 지역 전화번호 등까지 폭넓은 영역으로 구성되어 있다. 이 논문은 웹 문서내 내에 존재하는 공간 텍스트 정보를 기반으로 위치를 맵핑 할 수 있는 알고리즘들을 제시하고 있다. 이 알고리즘들을 통해 웹 문서들을 일반 웹 단어 기반 문서 검색 뿐만 아니라, 지도상에서 공간 영역과 텍스트의 복합형태로 해당 지역을 설명하는 문서들을 검색할 수 있게 된다. 마지막으로 이 논문에서는 제안된 알고리즘들을 이용하여 웹 공간 텍스트 질의 시스템을 구현함으로써 유용함을 보였다.

• 한국GIS학회:학술대회논문집
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• 한국GIS학회 2003년도 추계학술대회논문집
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• pp.15-20
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• 2003

As an emerging technology in Computer graphics areas, SVG(Scalable Vector Graphic) makes it possible to make use of Vector graphics for servicing maps in basic internet browsing environment. SVG based thematic map Internet GIS system implemented by this research is free of special server side GIS mapping system and client side extra technology. It provides high-quality vector map which can interact with the user, template map which can be used for other purpose, glance the future map based on Webservices technologies. Many good characteristics of SVG in mapping at computer screen and reusability of SVG document provide new era of visualzation of geographic information.

• 한국GIS학회:학술대회논문집
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• 한국GIS학회 2003년도 공동 춘계학술대회 논문집
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• pp.629-636
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• 2003

• Smart Structures and Systems
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• 제22권2호
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• pp.201-207
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• 2018

This paper proposes a line laser thermography scanning (LLTS) system for multiple crack evaluation on a concrete structure, as the core technology for unmanned aerial vehicle-mounted crack inspection. The LLTS system consists of a line shape continuous-wave laser source, an infrared (IR) camera, a control computer and a scanning jig. The line laser generates thermal waves on a target concrete structure, and the IR camera simultaneously measures the corresponding thermal responses. By spatially scanning the LLTS system along a target concrete structure, multiple cracks even in a large scale concrete structure can be effectively visualized and evaluated. Since raw IR data obtained by scanning the LLTS system, however, includes timely- and spatially-varying IR images due to the limited field of view (FOV) of the LLTS system, a novel time-spatial-integrated (TSI) coordinate transform algorithm is developed for precise crack evaluation in a static condition. The proposed system has the following technical advantages: (1) the thermal wave propagation is effectively induced on a concrete structure with low thermal conductivity of approximately 0.8 W/m K; (2) the limited FOV issues can be solved by the TSI coordinate transform; and (3) multiple cracks are able to be visualized and evaluated by normalizing the responses based on phase mapping and spatial derivative processes. The proposed LLTS system is experimentally validated using a concrete specimen with various cracks. The experimental results reveal that the LLTS system successfully visualizes and evaluates multiple cracks without false alarms.

• Geosciences Journal
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• 제22권6호
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• pp.1053-1067
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• 2018

This paper uses a probability-based approach to study the spatial relationships between landslides and their causative factors in the Mingchukur area, Bostanlik districts of Tashkent, Uzbekistan. The approach is based on digital databases and incorporates methods including probability analysis, spatial pattern analysis, and interactive mapping. First, an object-oriented conceptual model for describing landslide events is proposed, and a combined database of landslides and environmental factors is constructed by integrating various databases within a unifying conceptual framework. The frequency ratio probability model and landslide occurrence data are linked for interactive, spatial evaluation of the relationships between landslides and their causative factors. In total, 15 factors were analyzed, divided into topography, hydrology, and geology categories. All analyzed factors were also divided into numerical and categorical types. Numerical factors are continuous and were evaluated according to their $R^2$ values. A landslide susceptibility map was constructed based on conditioning factors and landslide occurrence data using the frequency ratio model. Finally, the map was validated and the accuracy showed the satisfactory value of 83.3%.