• Journal of Korean Society for Geospatial Information Science
• /
• v.17 no.3
• /
• pp.13-21
• /
• 2009

Digital map should have the up-to-dateness as well as the accuracy to perform a role as the national spatial data. As digital mapping process require aerial photograph, surveying, and field working, it consumes a lot of time and cost. So there is a limit to maintain the up-to-dateness. If we updates the digital map frequently by using the as-built drawings, we can prevent the waste of national budget by reuse of existing drawings and make accuracy updates from existing survey results. In spite of this advantages, due to insufficiency of CAD drawing standard, inconsistency of file types of as-built drawings and digital maps, and topology relations between input features and original features, so the frequent updates using the as-built drawings is on the difficult situation to perform. In this research, first, CAD features extracted from as-built drawings land the new/update whether original features exist or not and generate topology from spatial relation of features. Second, suggest the efficient partial-update-plan performing integrity test. As a result, guarantee the accuracy and the up-to-dateness of digital map.

• Journal of the Institute of Electronics Engineers of Korea CI
• /
• v.46 no.5
• /
• pp.57-70
• /
• 2009

A CAD design drawing based on vector data that is very important art work in industrial fields has been considered to content that the copyright protection is urgently needed. This paper presents a watermarking scheme based on k-means++ for CAD design drawing. One CAD design drawing consists of several layers and each layer consists of various geometric objects such as LINE, POLYLINE, CIRCLE, ARC, 3DFACE and POLYGON. POLYLINE with LINE, 3DFACE and ARC that are fundamental objects make up the majority in CAD design drawing. Therefore, the proposed scheme selects the target object with high distribution among POLYLINE, 3DFACE and ARC objects in CAD design drawing and then selects layers that include the most target object. Then we cluster the target objects in the selected layers by using k-means++ and embed the watermark into the geometric distribution of each group. The geometric distribution is the normalized length distribution in POLYLINE object, the normalized area distribution in 3DFACE object and the angle distribution in ARC object. Experimental results verified that the proposed scheme has the robustness against file format converting, layer attack as well as various geometric editing provided in CAD editing tools.

• Proceedings of the Korean Information Science Society Conference
• /
• 2002.04b
• /
• pp.694-696
• /
• 2002

본 논문에서는 초 .중등학교의 교육정보화 시설 및 장비관리의 효율성 제고방안을 제안하였다. 이를 위해 CAD 도면의 BOM 정보를 활용한 학교시설관리와 업무처리 방안을 모색하였다. 먼저, BOM 기능을 활용하여 시설 장비 객체와 관리정보를 함께 기록한 CAD 도민을 얻고, 여기에서 관리대상 객체에 대한 속성을 추출하여 관리정보 DB를 구축하였다. 이를 토대로 구현한 시선관리시스템에서는 사용자가 검색조건을 부여하여 필요한 관리정보를 산출할 수 있도록 하였다. 이 시스템을 통해 효율적이고 통합적인 학교시설 . 장비관리가 가능함을 보였다.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.22 no.5
• /
• pp.475-485
• /
• 2009

In this paper a two-step algorithm is proposed to efficiently generate rebar elements from 3D CAD data in the context of CAD/CAE data transfer. The first step is an algorithm to identify various type rebar objects and their attributes by analyzing 3D CAD data in STEP format, which is one of the international data standards. The second algorithmic step is a procedure to generate one-dimensional rebar elements from the object data made through the first step for finite element analysis or other CAE tasks. Successful rebar element data generation from real 3D CAD data for a reinforced concrete structure shows the efficacy of the proposed algorithm.

• Bulletin of the Society of Naval Architects of Korea
• /
• v.30 no.1
• /
• pp.15-18
• /
• 1993

1970년대 초반부터 조선공업에 이용되기 시작한 CAD/CAM시스템은 설계단계에서 생산단계까지 그 사용이 보편화되고 있으며, 그 적용범위도 계속 넓어져 가고 있다.그러나 이들 CAD/CAM시스템들은 폐쇄형 구조를 가지고 있기 때문에 각종 설계관련 응용프로그램과의 접속에 어려움을 가지고 있다. 현재 개발되고 있는 CAD/CAM은 개방형 구조를 갖고, 기존환경과 접목이 가능한 통합시스템 개발로 나아가고 있다. 이 글에서는 최근 대두되고 있는객체지향기술을 실제 응용분야에 적용할 수 있고 개방형 구조를 갖는, 객체지향형 모델러인 AICS에 관해서 소개하였다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.27 no.2
• /
• pp.281-288
• /
• 2009

In the paper, we try to develop the methodology for updating road networks of large-scale digital maps by using construction drawing data. For the purpose, it is pre-requite step to merge road networks detached in CAD drawing data. As such, tie points are identified in neighboring drawings and used for solving the parameters of 2D conformal transformation between drawings. Then, the merged road network in CAD data is transformed to the coordinate system of digital maps. In the process, IPs in the drawings are considered as control information and 2D affine transformation is selected for coordinate transformation. Through the experiments with real dataset, we can identify that the developed method is valid and generally applicable.

• Journal of The Korean Digital Architecture Interior Association
• /
• v.1 no.1
• /
• pp.46-50
• /
• 2001

It is known that to automate the quantity take-off process enables you to increase the productivity best among the construction business field. However, the limitation of 2D(Two-dimension) CAD System prevented a cost-estimating system which makes the great effects on the quantity take-off process from being developed. This study aims that you can automate both the itemized statements and the quantity take-off process by using commercially available object-oriented CAD system. The commercially available CAD system today does not give us entire satisfaction. This study shows the deduction of the old boundaries of the object-oriented CAD system and the solution of those problems. And it also studied about the quantity take-off process and the automated cost-estimating system that can be used in the simple and plain repair-maintenance work such as the execution drawing which doesn't need the complicated drawings.

• Broadcasting and Media Magazine
• /
• v.27 no.3
• /
• pp.67-78
• /
• 2022

제조업과 같은 산업체에서는 현장을 이해하고 문서를 확인하는 과정에서 시간, 비용이 많이 소요되기 때문에 해석하기 용이한 3차원 형태의 데이터로 미리 제작하고 온라인으로 모델을 공유하고 수정하는 것은 작업 효율을 향상시킬 수 있다. 작업물을 3D 객체 형태로 분석하거나 수정 보완을 위한 가상 목업(mock-up)으로 활용할 경우, 3D 모델링을 빠르고 정확하게 생성하는 기술에 대한 연구가 필요하다. 본 논문에서는 2D CAD 이미지를 분석하여 도형 형태와 수치 정보를 각각 인식하고 3D 객체를 자동 생성하는 방법의 설계를 제안한다. 제안한 방식을 통해서 2D 이미지 파일의 별도 변환 없이 3D 객체로 자동 생성할 수 있다. 빠르게 자동 생성된 3D 객체는 XR 등의 다양한 플랫폼에서 정확하고 세밀한 형태를 가상 공간에서 공유할 수 있어 작업자 간 협업 효율성을 높일 수 있다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.26 no.4
• /
• pp.387-396
• /
• 2008

An integration between construction CAD data and GIS data needs geo-referencing processes of construction CAD data whose coordinate systems are their own native or even unknown. Generally, these processes are based on manually detected conjugate-vertices. In this study, we proposed an semi-automated conjugate -vertices detection method for building features between construction CAD data and a digital map using a vertex attributed string matching algorithm. A geo-referencing function for construction CAD data based on the similarity transform could be derived with those conjugate-vertices. Using our proposed method, we overlaid geo-referenced CAD data to a digital map of the College of Engineering, Seoul National University and evaluated our method.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
• /
• 2009.04a
• /
• pp.11-13
• /
• 2009

This research is renewal way to get latest digital map, We presented techniques to convert to GIS data for update digital map to utilize completion drawing of CAD data that is used construction and SOC construction. Conversion process is consisted of layer extraction, object transform, coordinate transform, format transform. GIS data that is changed via each process from CAD data can update digital map.