• 한국CDE학회논문집
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• 제22권1호
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• pp.44-58
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• 2017

The inspection for building occupancy authorization has lacked objectivity due to manual measurement methods. This is why connivance of the illegal buildings has been rampant, which has led to so many incidents. Consequently, this law has lost its intent to protect people's lives and property. In this study, for the purpose of improvement of this law, the research was conducted by the utilization of unmanned aerial vehicle for automated inspection for building occupancy authorization. Theoretical considerations about building occupancy authorization and the trend of UAV technology were accomplished. Secondly, a series of reverse engineering was conducted including digital photography, network RTK-VRS surveying and post-processing data. Thirdly, the resultant spatial information was used for building occupancy inspection authorization in a BIM platform and the effectiveness and applicability of UAV-based inspection was analyzed. As a result, methodology for UAV-based automated building occupancy inspection authorization was derived. And it was found that eleven items would be possible to be automated among thirty total items for building occupancy authorization. Also it was found that UAV-based automated inspection could be valid in inspecting building occupancy authorization due to authentic accuracy, effectiveness and applicability with government policy.

• 한국조경학회지
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• 제44권1호
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• pp.40-50
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• 2016

오늘날 건설, 토목 산업 분야에 활발히 적용되고 있는 BIM은 초기 계획 설계에서부터 시공, 유지관리, 철거에 이르기까지 전 분야의 효율성을 극대화 할 수 있는 기술이지만 국내 조경분야에서는 도입단계에 있다. 본 연구에서는 조경설계분야에 BIM 도입과 활성화를 위하여 BIM 라이브러리(library)와 템플릿(template)의 프로토타입(prototype)을 개발하고 시범적용을 통한 성과를 분석하였다. 프로토타입 개발을 위하여 기 조성된 소공원을 대상으로 도면별 주석과 유형을 분석하여 조경 템플릿 구성요소를 도출하였으며 이를 기반으로 놀이시설물, 파고라, 벤치 등을 패밀리(family) 및 템플릿으로 제작하여 자동화 설계를 가능하게 하였다. 또한 조경설계에서 자주 사용하는 주석과 태그를 만들었으며, 특히 가시성/그래픽 재지정을 이용하여 3D뷰를 구현되도록 하였다. 설계 수량은 경계석 일람표, 마운딩 일람표, 수량집계표, 목차리스트, 포장 수량집계표 등을 그룹화 하여 도면과 연동되도록 하였고 조경 수목은 국내 실정에 맞는 분류기준 및 수목명을 적용하였다. 조경 템플릿은 건축 BIM 프로그램에 탑재될 수 있는 라이브러리 파일 형식(rfa)으로 작성이 가능하도록 하였다. 작성된 템플릿을 시범적용 후 나타난 문제점으로는 수량집계표 작성 시 기호의 자동 삽입, 일람표 작성 시 산출근거를 자동으로 만들지 못하는 문제가 있었다. 이는 BIM 프로그램 및 템플릿 기능 개선을 통해 해결해야 할 것으로 판단된다.

• 한국BIM학회 논문집
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• 제8권1호
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• pp.24-32
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• 2018

A construction machine guidance system is an assistance system that helps construction equipment operators dig grounds during excavation work at a construction site. This system has long been applied in the overseas countries of the United States, Japan and Europe. However, the system has not been paid much attention in Korea. The objective of this paper is to present a business model for adopting construction machine guidance systems in Korea and evaluate the effectiveness of applying the system to excavation work. The business model in this study shows a new process of applying construction machine guidance system, business stakeholders and revenues, and suggests the benefits to the business stakeholders. A field test of the construction machine guidance system proves that the system can be applied as a tool that can improve the productivity of excavation work. This productivity improvement consequently demonstrates that the business model in this study is a prospective challenge in improving the effectiveness of excavation work at the construction site.

• 한국BIM학회 논문집
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• 제8권1호
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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.

• 한국측량학회지
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• 제38권2호
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• pp.131-140
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• 2020

Recently the importance of BIM (Building Information Modeling) that enables 3D location-based design and construction work is being highlighted around the world. In Korea, the road map has been established to settle the design based on BIM using drone survey results by 2025. As the first step, BIM would be applied to road construction projects worth more than 50 billion Korean Won from 2020. On the other hand, drone survey regulation has been enacted and the data for drone survey cost were also included on Standard of construction estimate in 2020. However, more careful improvement is required to reflect drone survey results in BIM design and construction. Currently, Engineering instructions and Standard of construction estimate specifies that earthwork volume must be calculated by cross section method only. So it is required to add the method of DEM (Digital Elevation Model) based volume calculation on these regulations to realize BIM application. In order for that, this study verified the method of DEM based earthwork volume calculation. To get an accurate DEM for accurate volume computation, drone survey was carried out according to the drone survey regulation and then could get an accurate DEM data which have errors less than 3cm in X, Y and 6.8cm in H. As each DEM cell has 3D coordinate component, the volume of each cell can be calculated by obtaining the height of area of the cell then total volume is calculated by multiplying total number of cells by volume of each cell for the construction area. Verification for the new calculation method compare with existing method was carried out. The difference between DEM based volume by drone survey and cross section based volume by traditional survey was less than 1.33% and it can be seen that new DEM method will be able to be applied to BIM design and construction instead of cross section method.

• 한국BIM학회 논문집
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• 제10권4호
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• pp.89-97
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• 2020

The purpose of this study is to identify the problems of the currently used 3D spatial information utilization system to realize a more accurate landscape and to establish a user-oriented environment to improve the utilization plan for future landscape evaluation. As citizens' interest in urban landscapes with strong public characteristics increases and the speed of urban development also increases, more suitable simulation methods for landscape management are required. Nevertheless, there are many cases of inconvenient correction according to development changes along with many errors in various steps for creating landscape simulation. Therefore, in performing landscape deliberation according to development, it is necessary to create more accurate and efficient landscape simulation, and if changes occur after the initial deliberation, a process that can quickly and conveniently correct and supplement data is needed. In addition, it is necessary to create landscape simulation so that the created modeling source can be used by being compatible with other application programs. In this study, a method of constructing a more accurate and efficient simulation at the time of initial deliberation and a method of creating a landscape simulation model for rapid response to a plan that is changed at the time of re-deliberation are described.

• 한국BIM학회 논문집
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• 제12권2호
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• pp.1-11
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• 2022

Road traffic accidents (RTAs) are the leading cause of accidental death among children. RTA reduction is becoming an increasingly important social issue among children. Municipalities aim to resolve this issue by introducing "Smart Pedestrian Crosswalks" that help prevent traffic accidents near children's facilities. Nonetheless such facilities tend to be installed in relatively limited number of areas, such as the school zone. In order for budget allocation to be efficient and policy effects maximized, optimal location selection based on machine learning is needed. In this paper, we employ machine learning models to select the optimal locations for smart pedestrian crosswalks to reduce the RTAs of children. This study develops an optimal location index using variable importance measures. By using k-means clustering method, the authors classified the crosswalks into three types after the optimal location selection. This study has broadened the scope of research in relation to smart crosswalks and traffic safety. Also, the study serves as a unique contribution by integrating policy design decisions based on public and open data.

• 한국BIM학회 논문집
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• 제12권3호
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• pp.39-51
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• 2022

3D scan technology can utilize real spatial information as it is in virtual space, so it can be usefully used in various fields such as reverse engineering of buildings and process management. Recently, with the development of ICT technology, more precise scan data can be obtained, and scan processing time has also been greatly reduced. In addition, the combination of software and scanning equipment used in 3D scanning technology is very diverse, and results are very different depending on which technology is used. Accordingly, there is a problem that it is difficult for a user who has no experience in 3D scanning technology to determine which technology and equipment should be used to obtain good results. In this study, 3D scan technologies mainly used at home and abroad are investigated, classified, and tested at actual construction sites to suggest considerations and suitable 3D scan methods when using 3D scans in construction sites. The test results were analyzed to evaluate the time it takes to scan, the final quality, and the user's convenience according to each technology method.

• 한국전산구조공학회논문집
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• 제23권3호
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• pp.325-330
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• 2010

현행 토목 설계분야에서는 BIM(Building Information Modeling)기반의 3차원 객체모델의 활용이 미미한 수준이다. 본 논문에서는 철도교량의 상부구조인 PSC 박스거더에 대하여 BIM기반의 3차원 객체 모델을 구성하였으며, 모델의 기초구성은 파트(Part)모델로 되어있다. 파트(Part)모델은 여러 가지 단위 모델 중 최소 단위이며, 이것은 설계대상 구조물의 특성을 반영하여 계층구조를 가진다. 3차원 객체 모델은 설계자의 설계변경의도를 신속하게 반영할 수 있어야 한다. 실제 설계과정에서는 반복적인 설계변경이 발생할 수 있기 때문이다. 이를 위하여 설계변수를 파라미터로 구분을 하였으며 그 파라미터들은 3차원 객체모델의 정보와 연계되어 있기 때문에 설계 변경에 신속하게 대응할 수 있다. 이 연구에서 우리는 3차원객체 모델을 토목설계분야에 활용하여 얻을 수 있는 이점을 고찰하였다. 또한 PSC 박스거더의 3차원 객체 모델의 효율적인 적용방안을 제시하였다.

• 한국과학예술포럼
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• 제37권3호
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• pp.135-145
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• 2019

BIM기반 협업 과정에서 정보 교환을 위해 활용중인 IFC(Industry Foundation Classes)는 구조적인 한계로 분야간 정보 교환 결과에 대한 신뢰성을 확보하지 못하고 있다. 결국 분야별 전문 BIM 소프트웨어를 사용 할 수밖에 없는 현실적 문제로 정보 교환 및 변경 과정에서 원할한 상호 운영성을 확보 하지 못하고 있다. 본 연구는 이러한 문제들을 해결하기 위해 소프트웨어 개발사들이 제공하고 있는 오픈 소스(Open Source)를 활용하여 건축-구조 분야 간 BIM 업무 상호 운영성 확보 방안을 찾기 위해 다음과 같이 연구하였다. 첫째, 전문가 설문조사 및 심층 인터뷰를 통해 건축-구조 분야간 협업 과정에서 요구되어지는 정보들과 개선 요소를 도출하였다. 둘째, 개선 요소에 대한 해결 방안을 찾기 위해 Open-API 관련 기존 연구 고찰과 국·내외 API를 개발 사례를 조사 및 분석하였다. 셋째, 각 분야에서 주로 활용중인 BIM S/W를 중심으로 Open API를 활용하여 상호 운영성을 확보 할 수 있는 애드온(Add-On)을 개발하였다. 연구 결과 API를 활용하여 분야간 설계 변경 이력관리를 통한 상호 운영성을 확보 할 수 있는 가능성을 확인 하였다. 향후 시공 및 유지관리 분야까지 API 활용 범위는 넓어질 것으로 판단된다. 따라서 응용 확산을 위해 활용성을 높이기 위해서는 사용자 중심의 검증을 통한 인터페이스 개선에 대한 연구가 추가적으로 필요하다.