• Proceedings of the Korean Institute of Building Construction Conference
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• 2022.04a
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• pp.227-228
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• 2022

In order to achieve the goal of cost management, which is one of the three major management goals of building production, this paper introduces an approximate cost estimating automation technology in the design stage as the importance of predicting construction costs increases. BIM is used for accurate estimating, and the quantity of structural members and finishing materials is calculated by creating a 3D model of the actual building. However, only 2D basic design drawings are provided when making an estimating. Therefore, for accurate quantity calculation, digitization of 2D drawings is required. Therefore, this research calculates the quantity of concrete structural members by calculating the area for the recognition area through 2D drawing recognition technology incorporating computer vision. It is judged that the development technology of this research can be used as an important decision-making tool when predicting the construction cost in the design stage. In addition, it is expected that 3D modeling automation and 3D structural analysis will be possible through the digitization of 2D drawings.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1992.10a
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• pp.63-67
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• 1992

본 논문은 프레스나 해머로 생산되는 리브/웨브 형태를 갖는 축대칭 부품에 대한 블로커설계 자동화시스템의 개발에 관하여 설명한 다. 플레시를 갖는 밀폐형단조 공정에서 블로커 형상의 설계는 매우 중요하다. 일반적으로 단조공정에서 부품의 형상은 대부분 3차 원 형상이다. 그러나 복잡한 3차원 형상의 부품을 그대로 고려하여 설계한다는 것은 어려움이 많고 실용적이지도 못하다. 따라서 블로커를 설계할 때 부품을 단면으로 도려함으로서 설계작업을 단순화시킬 수 있다. 본 논문에서는 축대칭 형태의 부품만을 고려하였다. 한 부품단면은 리브나 웨브와 같은 부분단면들로 분할할 수 있으며, 이 부분단면들에 대하여 설계규칙과 데이타베이스를 적용함으로서 블로커형상을 설계할 수 있다. 부품단면의 형상을 분할하여 시스템 내에 인식시키기 위하여 단면을 도면요소표현, 좌표 및 반경표현 그리고 속성표현으로 나타냈으며 여기에 단면의 도면요소표현은 부품의 체적, 단면적, 원주길이 및 반단면의 질량중심을 계산하는데 쉽게 이용될 수 있다. 그리고 좌표 및 반경표현은 경사각, 코너반경과 필렛반경을 수정하는데 그리고 속성표현은 리브와 웨브의 형태와 특성을 고려하여 블로커를 설계하는데 이용될 수 있다.

• Journal of the Korean Institute of Telematics and Electronics B
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• v.31B no.6
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• pp.91-103
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• 1994

As CAD systems are introduced in the filed of engineering design, the necessities for automatic drawing input are increased . In this paper, we propose a method for realizing automatic drawing input by separation of text regions and graphic regions, extraction of line vectors from graphic regions, and recognition of circular arcs and circles from line vectors. Sizes of isolated regions, on a drawing are used for separating text regions and graphic regions. Thinning and maximum allowable error method are used to extract line vectors. And geometric structures of line vectors are analyzed to recognize circular arcs and circles. By processing text regions and graphic regions separately, 30~40% of vector information can be reduced. Recognition of circular arcs and circles can increase the utilization of automatic drawing input function.

• Journal of Intelligence and Information Systems
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• v.2 no.1
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• pp.27-44
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• 1996

컴퓨터통합생산 시스템의 실현을 위한 중요한 분야의 하나의 부품설계도면으로부터 최종제품을 생산 하는데 필요한 공정계획의 자동화, 즉 컴퓨터지원 자동공정계획(Computer Aided Process Planning ; CAPP) 시스템 기술의 개발이다. 국내외적으로 금형가공 부품을 대상으로 한 CAPP 시스템의 개발은 비교적 저조하므로, 본 연구에서는 사출금형 부품을 대상으로 하여 실용성이 있는 공정계획 전문가시스템 개발을 목적으로 한다. 본 연구에서 금형 공정계획전문가의 경험적 지식을 기반으로 한 사출금형부품의 공정계획 전문가시스템인 MOLDCAPP을 개발하였다. MOLDCAPP 시스템은 도면정보로부터 형상정보를 자동적으로 인식하여 공정계획의 기능 중에서 가동공정, 가공공정 순서, 공작기계 및 절삭공구를 자동적으로 결정한다. 개발된 MOLDCAPP 시스템은 실제 사례연구를 통하여 그 타당성을 분석하였다.

• Journal of the Korean Association of Geographic Information Studies
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• v.2 no.2
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• pp.1-8
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• 1999

Information representing the thickness of the original lines from the thinning results can be used efficiently in order to implement the automated vectorizing system. This paper proposes a preprocessing scheme of thinning which can show the information of the original lines' thickness from the thinning result. In the proposed scheme, the depth of each pixel constructing the lines was calculated, which was represented by the number of layers composed of neighboring pixels surrounding the original pixel. And then the original lines' thickness could be recognized through the depth information of the skeleton from the thinning results. We implemented the proposed scheme and experimented on a contour map. Using the depth information of the skeleton, we could easily distinguish each line of the contour either an intermediate or an index contour.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1992.04a
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• pp.245-249
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• 1992

CAD와 CAM 시스템 사이에서 교량역활을 지원하며, 컴퓨터 통합생산(CIM)시스템을 구축하는데 중요한 기능을 수행하는 것 중의하나인 자동공정설계(Computer Aided Process Planning :CAPP) 시스템의 첫 단계는 부품도면에 존재하는 형상 을 인식하는 것이다. 현재까지 개발된 CAPP 시스템 중 CAD 데이타베이스에서 자동적으로 형상인식을 수행하는 시스템 으로는 축대칭인 회전형상 부품을 대상으로하는 시스템이 많이 개발되어 있으나, 비회전형상 부품을 대상으로하는 시스 템은 CAD 데이타베이스의 부적절성으로 인해 제한점이 많은 부분적인 결과만 나와 있을 뿐이다. 본 연구에서는 비회전 형상 부품인 사출금형 부품을 대상으로하여 AutoCAD 시스템을 사용하여 공정설계자의 개입이 없이부품에 존재하는 형상들을 자동적으로 인식하는 알고리즘 개발에 대해서 기술하고자 한다.

• Journal of Institute of Control, Robotics and Systems
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• v.2 no.3
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• pp.229-235
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• 1996

CAD diagrams generally consists of many basic components: symbols, character, and connection lines. Thus, to recognize the diagrams, it is necessary to extract each components, and understand their meanings and relation among them. This paper describes a method for linking basic components extracted efficiently from hand-down diagrams to OrCAD data format. Experimental results with a hand-drawn diagrams of electronic and logic circuit show utility of the proposed method.

• Korean Journal of Construction Engineering and Management
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• v.20 no.5
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• pp.52-60
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• 2019

The APR1400 is a 1400MWe nuclear power plant developed through national technology development project over a period about 10years. Approximately 65,000 design drawings are produced for APR1400 construction. In order to maintain consistency among numerous drawings, the highest level of design bases drawings (DBDs) are created according to design bases and this is used in the subsequent design. However, DBDs are produced and managed on a document basis and they are managed various field, it was difficult to accurately reflect the design bases information in the subsequent design. Therefore, this study recognizes limitations of the document based DBDs and develops a system that can accurately reflect the design bases information to subsequent design by adopting BIM based design bases integrated information system. Especially, by introducing DBIL(Design Bases Information Layer) concept, DBIL was created and analyzed based on five design bases(Physical protection, Fire protection, Internal missile protection, Internal flood protection, Radiation protection) applied to APR1400. In the final result DBIL set and Datasheet are integrated of room, design bases information, building data(wall, slab, door, window, penetrations). So it can be used for subsequent design automation and design verification. Furthermore, it is expected that APR1400 DBILs data can be used extensively in constructability and design economics analysis through comparison with next generation nuclear power plant.

• The Transactions of the Korea Information Processing Society
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• v.4 no.12
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• pp.2960-2970
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• 1997

In a variety of fields, recently, there is a growing interest in Geographic Information System which facilitates efficient storage and retrieval of geographic information. It is of extreme importance to make a good choice of efficient input method, because it takes the most of the lime and cost in constructing a GIS. Among several steps, thinning input image to produce skeleton of unit width is prerequisite to the automatic input or geographic maps. In this paper, we systematically evaluate the performance of representative thinning algorithms in geographic maps such as contour, cadastral, and water and sewer maps, and suggest appropriate algorithms for the maps, respectively. A thorough experiment indicates that Arcelli's method is best for contour maps, Holt's method for cadastral maps, and Chen's method for water and sewer maps.

• Journal of KIBIM
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• v.13 no.4
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• pp.85-95
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• 2023

In the process of creating drawings based on Building Information Modeling (BIM), automatically generated annotations can cause interference issues depending on the drawing type. This study aims to develop an algorithm for repositioning annotations using genetic algorithms to minimize such interferences. To achieve this, the Application Programming Interface (API) of BIM software was used to analyze data extractable from BIM drawing files. The process involved defining drawing data related to annotation repositioning, preprocessing this data, and deriving optimal placement coordinates for the annotations. Furthermore, applying the developed algorithm to the preliminary design drawings of small and medium-sized neighborhood facilities resulted in approximately a 95.37% decrease in annotation interference, indicating that the proposed algorithm can significantly enhance productivity in BIM-based drawing tasks.