• Journal of KIBIM
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• v.9 no.3
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• pp.30-40
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• 2019

Extraction of fabrication documents is very important because it provides information related to tasks of fabrication and construction. Therefore, in the case of a prefabricated member such as a steel structure, it is necessary to improve the productivity of fabrication documents through 3D BIM. However, research and evidence data on direct comparison analysis of 3D BIM-based documents extraction versus 2D CAD-based documents extraction are hard to find. Thus, this study focuses on productivity analysis of 3D BIM based fabrication documents extraction. In this study, the productivity data of fabrication documents extraction for module construction of EPC project was analyzed. For the productivity analysis, a case study on the fabrication documents of Module A (1,965 sheets) and Module B (1,216 sheets) was conducted. Fabrication documents for each module include general arrangement drawing, assembly drawing, single part drawing and single plate drawing. Comparison of 2D CAD based fabrication documents extraction and 3D BIM based fabrication documents extraction, the productivity for the entire work was improved from 17 hours to 16 hours for Module A and 12 hours to 7 hours for Module B. Especially, the productivity of the assembly drawings, which occupies a large part of the fabrication documents, was improved by about 48.75% from the total time required from 281 hours to 144 hours.

• Journal of the Korean Institute of Landscape Architecture
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• v.39 no.5
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• pp.76-90
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• 2011

As most landscape drawings tend to be recorded in electronic format, the need for layer standards is growing. While the categorization system of planting drawings has been progressing, landscape facility drawings are being delayed. So, the purpose of this study was to establish the categorization system of computerized landscape facility drawing documents. In the beginning of this study, it found that the layer categorization system of "The Standards of Construction CALS/EC computerized drawings v1. 1" and "The submit instructions of electronic design documents" are not suitable for the landscape facility drawings. 1,154 drawings drawn by 10 landscape architect offices were used to analyze the current layer categorization status. As a result, it found that "The Standards of Construction CALS/EC computerized drawings v1. 1" were not introduced in landscape facility drawings and 46% of layers were produced indefinitely. The new layer categorization system consisting of 15 facility items was drawn by applying the ISO construction information categorization system. The new layer categorization system is set on the basis of the legal code, landscape design standards, and design guidelines of public institutions. This new layer categorization system is expected to propagate at the landscape architect offices in the early.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.13 no.2
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• pp.135-140
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• 1995

As the expansion of metropolis has been going, the role of underground utilities has importantly increased. The existed data is difficulty to acquire accurate data and computerize it. In the construction site, Particularly, the map of existed underground utilities has included so much inaccurate data. This study suggestes that making terrain map and surveying if the position of underground utilities are simultaneously done, also this method improves data accuracy and makes the computerized map such as CAD easy match the map of established underground map. The excution of this study collectes data by surveying of terrain and under ground utilities. Through new data collection, we can plot and acquire the position of real under ground utilities and attribute data about them.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2009.04a
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• pp.15-17
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• 2009

The line simplification method based on the turning function is studied in this paper for conversion of ground plan data to geospatial data to update the digital map. This method eliminate vertices effectively by estimating the length and the angle between the vertices based on the turning function which is useful to express the shape of linear feature. As the result, this method shows high shape similarity, high elimination rate of vertices and 100% of satisfaction degree to the drawing rules. Thus this line simplification method is judged to be effective in updating the digital map with ground plans.

• Journal of the Society of Naval Architects of Korea
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• v.56 no.1
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• pp.66-74
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• 2019

In the field of shipbuilding design, the use of 3D CAD is becoming commonplace, and most of the large shipyards are conducting 3D design. However at the production site, workers are still working on 2D drawings rather than 3D models. This tendency is even worse in small-scale shipyards and block manufacturing shops. Particularly, in a manufacturing shop that is engaged in the outsourcing of blocks, it may not be possible to provide 3D model. However, the demand for 3D models in the production field is steadily increasing. Therefore, it would be helpful if 3D model could be generated from a 2D drawing. In this paper, we propose a method to extract template and unfolded surface shape information from shell template offset drawing using computer vision technology. Also a 3D surface model was reconstructed and visualized from the extracted information. The result of this study is thought to be helpful in the work environment where 3D model information can not be obtained.

• Journal of KIBIM
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• v.10 no.4
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• pp.98-109
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• 2020

Based on the prior research which developed the consistency review checklist of the BIM model and 2D drawing through the drawing analysis of the construction documents phase, the apparent limits of the existing template and the template development items were derived. As well, the BIM-based drawing templates of the construction documentation phase were developed and verified using ArchiCAD BIM software. The developed template was then applied to the actual project model in the construction documents phase, and, as a result, 50% of existing work elements could be utilized as templates. This is an increase of more than 30% over the existing template utilization elements, and it is analyzed to be effective in practical application and utilization. Based on the results of this study, if the BIM model construction criteria matching the drawing's utilization purpose are presented, while at the same time the BIM data interlocking and drawing template development studies are conducted, the utilization of BIM data can be maximized and additional drawing work can be minimized to increase the percentage of template utilization elements. In addition, it is believed that this can employed to address functional and institutional problems of BIM-based drawing and make a contribution to the activation of BIM.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.733-735
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• 2002

반도체 CAD기술과 제조기술의 발전으로 인하여 반도체 집적도가 2001년 2002년 각각 0.35, 0.25마이크론 등으로 급속도로 증가하게 되었으며 이러한 집적토의 향상은 기대치 이상의 시스템 성능 향상을 이룩할 수가 있었다. 그러나 피할 수 없는 제조 공정의 변화와 불완전성으로 인하여 칩 크기에 제한이 따르게 되며 그 이상의 크기에서는 상용화가 불가능할 정도로 수율(Yield)이 현저하게 감소하게 된다. 기존의 대부분 연구가 반도체의 생산 공정의 관점에서 준비되어 활용되는 통계 자료에 근거한 경험의 축적이었다. 그런 연유로, 단지 반도체 생산 부분의 자료에만 치중하다보니 실지 반도체 수율에 가장 큰 영향의 요소인 랜덤 디펙트(random defect) 수율을 고려하지 못하는 치명적인 결점이 있다. 본 연구는 반도체 수율 분석과 수율을 증진시키기 위하여 설계된 도면 중 레이아웃에 해당하는 도면을 입력으로 하여, 반도체 생산 설비 즉 공정의 상태나 변수를 모델링하여 이를 수율 예측을 위한 기분 자료로 사용한다. 즉, 설계 단계에서 수율을 예측함으로써 과거 64M DRAM의 초기 단계에서의 수율과 같은 문제점을 해결할 수 있는 방안을 제시할 뿐 아니라, 비 메모리 칩의 수율을 설계단계에서 제공하는 역할을 한다.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2008.10a
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• pp.264-265
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• 2008

본 연구에서는 건물공사에 사용되는 CAD 도면자료를 공간데이터로 변환하기 위한 과정의 일환으로 수치지도 작성내규에 근거한 선형단순화 기법을 제안하였다. 이 기법은 외곽선의 절점들이 수치지도 작성내규의 곡선데이터 점간거리 규정에 만족할 때까지 반복적으로 절점의 구간을 늘려나가는 방식이다. 제안된 기법의 단순화효과를 비교하기 위하여 Douglas-Peucker 알고리듬 등 가장 흔히 사용되는 4개의 선형 단순화기법을 동일한 건물 외곽선에 적용하여 수치지도작성 내규 만족도, 절점수, 선길이, 면적에 대해 비교, 분석하였다. 분석결과 제안된 알고리듬의 경우 수치지도 내규 만족도 면에서 100%에 가까운 만족도를 보였으며 절점수를 효율적으로 줄이면서, 선길이, 면적의 측면에서도 다른 알고리듬들에 비해 거의 손실이 발생하지 않아 추후 건설도면의 변환에 유용하게 사용될 가능성이 높을 것으로 판단된다.

• 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 the Korea Academia-Industrial cooperation Society
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• v.19 no.3
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• pp.147-154
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• 2018

This paper focuses on the development of a support system that can rapidly generate the design data of a hot-form die with cooling channels, commonly known as hot stamping technology. We propose a new process for designing hot-form dies based on our (automated) system, whose main features are derived from the analysis of the design requirements and design process in the current industry. Our design support system consists of two modules, which allow for the generation of a 3D geometry model and its 2D drawings. The module for 3D modeling automation is implemented as a type of CATIA template model based on CATIA V5 Knowledgeware. This module automatically creates a 3D model of a hot-form die, including the cooling channels, that depends on the shape of the forming surface and the number of STEELs (subsets of die product) and cooling channels. It also allows for both the editing of the positions and orientations of the cooling channels and testing for the purpose of satisfying the constraints on the distance between the forming surface and cooling channels. Another module for the auto-generation of the 2D drawings is being developed as a plug-in using CAA (CATIA SDK) and Visual C++. Our system was evaluated using the S/W test based on a user defined scenario. As a result, it was shown that it can generate a 3D model of a hot form die and its 2D drawings with hole tables about 29 times faster than the conventional manual method without any design errors.