• Journal of the Korea Institute of Building Construction
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• v.19 no.6
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• pp.521-527
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• 2019

Quantity takeoff and cost estimates in Korea are carried out in practice without any clear standards or standards. Especially, quantity takeoff of Reinforcing bar and BoQ documentation process is very complex using 2D drawings. In this study, 10 case sites were analyzed for the status of inefficient quantity takeoff and how the statement was prepared. In order to solve this problem, this study presented a method for calculating the quantity of rebars through the ratio of concrete volume for schools, offices, and apartment buildings, and analyzed the accuracy of results. In the future, it is expected that the error range can be reduced by defining the factors affecting the results and calculating the correction value for them.

• Korean Journal of Construction Engineering and Management
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• v.23 no.2
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• pp.45-53
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• 2022

The purpose of this study is to present a model for analyzing construction errors of reinforced concrete pile foundations using drones. First, a drone is used to obtain an aerial image of the construction site, and an orthomosaic image is generated based on those images. Then, the circular pile foundation is automatically recognized from the orthomosaic image by using the Hough transform circle detection method. Finally, the distance is calculated based on the the center point of the reinforced concrete pile foundation in the overlapped data. As a case study, the proposed concrete concrete pile foundation construction quality control model was applied to the real construction site in Incheon to evaluate the proposed model.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2009.04a
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• pp.513-516
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• 2009

본 논문에서는 사례연구를 통하여 RC구조 BIM에서의 물량정보 획득의 효율성을 분석하고 이를 기반으로 BIM 프로세스 환경에서의 철근 및 콘크리트 물량산출을 위한 데이터베이스를 구축하여 현장 시공단계에서의 공정 및 물량관리의 협업단계를 가능하도록 하는 철근 Sorting 시스템에 대한 연구를 목적으로 한다. 기존의 건설, 건축분야에서의 정보는 기호적 언어와 2차원 기반의 도면 정보체계를 통해 표현되었지만, BIM 기술을 통해 건물의 실제 형상과 정보를 가지는 3차원 기반의 정보체계로의 변화와 함께 컴퓨터 데이터베이스 내에서 프로젝트에 포함된 모든 정보를 저장하고, 다양한 형태로 필요에 따라 정보를 표현할 수 있게 변화하고 있다. 견적 및 시공을 위한 RC구조설계단계에서의 배근 모델은 협업을 위한 객체 정보의 획득 및 추출이 중요하지만 현재 상용되고 있는 BIM도구에서는 현재까지 미흡한 체계를 이루고 있다. 본 논문에서는 구조설계를 기반으로 배근된 BIM 구조모델 사례를 통하여 기존 BIM도구에서의 물량 정보획득 효율성 분석을 기반으로 객체들의 데이터베이스 구축을 통한 철근 Sorting 시스템 구축 연구를 통하여 협업단계에서의 체계적 물량정보 관리를 가능하도록 하였다.

• Journal of the Korean housing association
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• v.21 no.6
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• pp.1-9
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• 2010

The purpose of this study is to analyze the acceptance of the On-dol, Korean underfloor heating system, in the official residences built by the japanese colonist in 1905~1945. The On-dol is the main element that formed Korean housing culture throughout our her history. Since the climate of Korea is colder than that of Japan, the Japanese-style house built in Korea needed to take measures for the harsher winter. Therefore the official residences built during the japanese colonial period, built after the Japanese-style house, accepted the On-dol as additional heating system for their houses. Over forty years the official residences were constructed in large quantities, and many of the official residences also installed the On-dol. Some important changes were discovered about the acceptance of the On-dol. To define this concretely, this study was performed empirically through the comparison and analysis of governmental architectural drawings. There is great significance to consider that an architectural element of Korea influenced the Japanese-style houses. In conclusion, differences between the official residences with the On-dol and those without, during the latter stage of the japanese colonial period have founded. These results demonstrate that this element of traditional korean architecture affected the development of foreign houses built in Korea.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.22 no.2
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• pp.163-172
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• 2009

BIM technologies based on three-dimensional parametric solid modeling can provide building industries with a wide range of information, and then enable not only to automate architectural drawings, detect clashes between building components, and estimate building materials, but also to manage effectively architectural and engineering information about building spaces, structures, energy, just-in-time delivery, facility management, and code checking. This paper presents an implementation to extract geometric data from IFC files, and validates the system with simple and complex buildings.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.05a
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• pp.612-614
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• 2018

Today, technologies that can acquire modeling data by using image are emerging. That 3D modeling production method, which is frequently utilized in contents industries, creates modeling data by using creator's intuitive sense, with drawings sketched without accurate measurement tools is also true. Recently, technologies that can facilitate modification and amendment of existing design by producing and reorganizing three-dimensional data of a sculpture through combination of image information are developing. This thesis gives suggestion of how to utilize and study the way to produce accurate three-dimensional modeling data by utilizing multiple image data.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.25 no.3
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• pp.29-57
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• 2014

As one of various cultural heritages created by humanity, traditional architectures are an archival heritage and cultural heritage reflecting social trends and historical facts. These traditional architectures show various features depending on characteristics by local areas and climatic conditions. They can be expressed in diverse formats such as a picture, a floor plan, and a book. For managing and retrieving traditional architecture records, it is necessary to develop metadata schema based on the FRBR model. Accordingly, this study analyzes the current situation and the problem of domestic and foreign metadata schema related to cultural heritage, and proposes the FRBR-based metadata schema for managing the traditional architecture.

• Journal of KIBIM
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• v.8 no.1
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• pp.43-55
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• 2018

Recently, there have been increasing studies on the application of digital technology, which has its focus of the irregular building. However, most of these studies have not clarified the objective of the technology and the effectiveness of professional manpower on its performance. This study analyzes actual used technology and the role of specialty contractor. It presents a framework to quantify the performance of the specialty contractor. For these purposes, this paper presents a proposed method to evaluate the activities of specialty contractors using a queueing model. As an attempt to verify the model, an actual irregular building project, in which digital fabrication is applied, is investigated during the construction phase. In order to collect the digital fabrication data, digital fabrication reports and specialty contractor's work log of project are reviewed. In addition, Digital Fabrication input personnel, productivity data are collected through interviews with experts involving in the case project. Analysis of specialty contractor's performance in digital fabrication reveals that the wait status of project participants varies probabilistically depending on the digital technology application level. The results of this study are expected to contribute toward the improvement of the production level in the construction industry.

• Journal of Korean Society of Steel Construction
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• v.23 no.1
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• pp.113-124
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• 2011

This study concerned the interoperability between the structural-analysis model and the default detail model in steel structures available for the structural-design process based on BIM. The purpose of the study was to develop an interface module that can perform data conversion between the analysis and design applications and the BIM applications, through the dotnet frame work development environment using OpenAPI provided by the BIM application vendor. The direct-link method was applied for BIM interoperability. A basic-frame model for detail design and modeling was created from the structural-analysis model to verify if the application was developed. Finally, the proposed process was compared with the existing process to verify the efficiency of the former.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.10
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• pp.6372-6378
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• 2014

This study examined the formal types and public space of Mies van der Rohe's office designs in Germany. The characteristics of the formal types, the relationship between public space and formal types, and the composition of public space were analyzed by hierarchy with perspective drawings and plans. The conclusions were as follows. Mies used the formal types, such as U shape and I shape in his early days. Later, he adopted the curved shape and tried to fragment the forms by combining the curved shape with an I shape. Mies designed the entry space in front of the simple formal types. The curved shape was used to create various hierarchical courtyards and rear gardens. The results suggest that Mies developed his own ideas on the formal types and public space utilizing a variety of methods.