Jungsik Choi

Open BIM-based quantity take-off system for schematic estimation of building frame in early design stage

Abstract Since construction projects are large and complex, it is especially important to provide concurrent construction process to BIM models with construction automation. In particular, the schematic Quantity Take-Off (QTO) estimation on the BIM models is a strategy, which can be used to assist decision making in just minutes, because 70–80% of construction costs are determined by designers׳ decisions in the early design stage [1] . This paper suggests a QTO process and a QTO prototype system within the building frame of Open BIM to improve the low reliability of estimation in the early design stage. The research consists of the following four steps: (1) analyzing Level of Detail (LOD) at the early design stage to apply to the QTO process and system, (2) BIM modeling for Open BIM based QTO, (3) checking the quality of the BIM model based on the checklist for applying to QTO and improving constructability, and (4) developing and verifying a QTO prototype system. The proposed QTO system is useful for improving the reliability of schematic estimation through decreasing risk factors and shortening time required.

An approach to share architectural drawing information and document information for automated code checking system

Abstract The purpose of this study is to suggest a way of optimized managing and sharing information between standard architectural drawings and construction documents in Korea architectural industry for automated code checking system by linked STEP and XML. To archive this purpose, the authors have analyzed current research and technical development for STEP and XML link and developed a prototype system for sharing information between model based drawings and XML based construction documents. Finally, the authors have suggested practical use scenario of sharing information through linked STEP and XML using test case of automatic code checking. In the paper, the possibility of constructing integrated architectural computing environment through exchange and sharing of drawing information and external data for the whole building life-cycle, from the conceptual design stage to the construction and maintenance stage has been examined. Automated code checking through linked STEP and XML could be enhanced through collaboration business, more completed code, improved building performance, and reduced construction costs.

Development of an Open BIM-based Legality System for Building Administration Permission Services

Abstrct In Korea, the government has developed SEUMTER, an administration system for building-related public services, to facilitate and promote electronic submission and permission activities. SEUMTER is a progressive legality system based on 2D drawings for building administration permission services. However, there are a lot of problems related to the development of a legality system due to the complexity of Korean regulations, relationships and structures, the inefficiency of designing a legality system based on 2D drawings, the duplication examinations of documents (soliciting forms for civil affairs), and the drawings themselves. Therefore, the purpose of this study is to develop a legality system for building administration permission services based on open Building Information Modeling (BIM) in Korea. To achieve this purpose, the authors investigate the permission procedures and regulation structures used in current building administration permissions, then formulate an ideal permission procedure and regulation structure for the legality system in Korea. In addition, the authors investigate element technologies (for example, methods of structuring regulation, BIM model checker, BIM model viewer) for a legality system based on BIM and develop a prototypical legality checking software. Finally, the authors suggest strategies and future applications for a legality system based on BIM.

Development of Check-list for BIM Based Architectural Design Quality Check

Received 14 February 2013; received in revised form 9 April 2013; accepted 16 April 2013ABSTRACT The construction industry consists of various and massive architectural information as an archi-tectural process includes a variety of design stages with cooperation of many disciplines. Partic-ularly, architectural information is generated and managed through the life cycle of a building,from conceptual design stage to the construction and maintenance. A Building InformationModel (BIM) serves as a shared knowledge resource for information about a facility forming areliable basis for decisions during its life-cycle from inception onward. BIM technology accom-plished quantitative development being utilized in various disciplines. However, it is necessaryto develop environment and requirement for qualitative improvement of BIM based project. Par-ticularly, requirement is very important for architectural design evaluations. The purpose of thisstudy is to develop and apply of quality control check-list for improving the quality of architec-tural design in BIM environments. To achieve this purpose, the authors have investigated casestudy for open BIM data quality control (software, guideline and application case) and classi-fied quality control targets according to physical/logical quality control and data quality. In addi-tion, the authors have defined open BIM based quality control process and developed qualitycontrol check-list. Finally, the authors have developed automatic quality check system usingrequirements for efficient quality control based on open BIM.Key Words:Building Information Modeling (BIM), Check-list, Code Information Check, IndustryFoundation Classes (IFC), Open BIM, Quality Control, Quality of Architectural Design

Development of BIM Performance Measurement System for Architectural Design Firms

Despite the effort of Korean government to vitalize BIM adoption in AEC industry, the domestic adoption of BIM is still in its initial step. Particular in design field where medium and small firms being the majority, shows lower level of BIM adoption. The primary reason for this can be considered as lacking of necessities caused by uncertain benefits of BIM. Therefore, it is time to develop the objectives, quantifiable and qualitative measurement system of BIM performances. The purpose of this study is to suggest the BIM Performance Measurement System for architectural design firms. In achieving this, the authors have developed Balanced Scorecard (BSC) and validated its appropriateness by questionnaire survey with experts and performing statistical analysis. This development can be contributed to the voluntary BIM adoption by visualizing the detailed benefit of BIM and to the improvement of enterprise competitiveness by facilitating management of design process and estimating future outcome.

Improvement of Open BIM-based Building Permission Process Using EPI(Energy Performance Index)

As many countries have been raising awareness of environmental issues, greater efforts for eco-friendly construction have been made in both governmental and private sectors. However, assessment circumstances for building energy performance and green building standard of legislation are still based on two dimension and handwork. This takes time, cost and labor, and makes assessment inaccurate and inefficient. Therefore, this study suggests methods to improve eco-friendly construction permission process and to automatize open BIM-based assessment of Energy Performance Index (EPI) among several eco-friendly construction certification standards. First, it analyzes the relations between assessment criteria and IFC data, and provides solutions to problems and limitations. Second, it applies the solutions to assessment program in order to automatize open BIM-based assessment for EPI. The eco-friendly construction permission process with these solutions applied will reduce time, cost, and labor by simplifying and automatizing the tasks. Also, the simplified process of design revision will improve not only productivity and efficiency but also accuracy and reliability.

Building Code Typology and Application for Open BIM based Code Checking

Received 24 June 2014; received in revised form 30 July 2014; accepted 11 August 2014ABSTRACTRecently, Productivity of the construction industry has been decreasing than other industries.Because of this, BIM is being spread in the construction industry. However, quality criteria forBIM data is insufficient. Regulation information is an important factor for initial architecturaldesign evaluations. However, building code and related regulation are numerous. National build-ing code structure in Korea is much more complex than other countries. The purpose of thisstudy is to suggest the typology method of building code and apply to real regulations. Toachieve this purpose, the authors have extracted required information to from original regula-tion for code checking and suggested mapping methods between extracted information andinformation of IFC scheme. In addition, the authors have represented EXPRESS-G diagram forextracting information from IFC scheme and suggested code checking method through staircase. Output of this study can be used as a base line data for automated code checking systembased on open BIM. Automated code checking system will be utilized in architectural designevaluations and supported to increase design quality. It can be used to mount in SEUMTER thatis the construction administration system of Ministry of Land, Infrastructure and Transport(MOLIT).Key Words:Building code, Building information modeling (BIM), Code checking, Design quality,Industry foundation classes (IFC), Typology

A Study on the Interoperability Improvement of IFC Property Information for Energy Performance Assessment in the Early Design Phase

Nowadays, AEC industry tries to adopt BIM for low-carbon and eco-friendly building development. With increasing environment policies, many of global construction projects require the adoption of BIM for its many advantages. The advantages can be maximized with Open BIM since it can produce optimal results for various purposes of energy performance assessment. However there are some troubles in representation and property information in the process of Open BIM based energy performance assessment. To examine such troubles, this study focuses on differences between IFC of Open BIM and IDF format of Energy Plus known as the most accurate and diverse energy performance assessment. Two issues the study addresses are form representation and property information. The study figures out the different definition of IFC and IDF, and suggests the way of interoperability. The interoperability test of IFC for building energy performance assessment hope to develop of Open BIM based energy assessment.

Visual language approach to representing KBimCode-based Korea building code sentences for automated rule checking

Abstract The Building Information Modeling (BIM) and its applications enable an automatic building permit process based on 3D building models and their associated information. A crucial part of the building permit process is the interpretation and transformation of natural language-based building regulation into a computer-readable and executable format. As other countries and their projects have developed a certain type of rule-translation methods, KBimCode, part of the KBim application series, has been developed and supported by the Korean government to ignite an automatic, BIM-based building permit system on top of the current e-submission system, which is called Seumter. The rule translation process usually employs a computer hard-coded approach because of its ease of implementation, and there have been advances in making the computer understand the natural language-based building regulations using parametric input tables and script languages. This project includes a step for developing a logic rule-based approach for translating natural language into computer-executable code. However, the main contribution of this study is the introduction of an approach to represent such text-based regulations using visual language for novice programmers, architects, and rule reviewers. This paper describes a KBimCode visual language that is easy-to-write and intuitive because it uses visual symbols instead of textual coding.

A Study on Development of Integrated Management System for BIM Property Information

Received 14 March 2016; received in revised form 28 April 2016; accepted 11 May 2016ABSTRACT BIM library, as a systematic collection of BIM objects where the building information is stored,is a vital factor to construct the BIM based work environment. However, construction businessis faced the problems relating BIM library such as the absence of the standard for establishingBIM library, the discontinuity of BIM librarys compatibility and the lack of practice applicableBIM library. These problems cause the decreasing work efficiency and the recreating BIMmodel, by delivering inefficient information required in each stage and application field. Thepurpose of this study is to suggest the integrated management system for property informationof BIM library in order to minimize the reworking and to manage information of each stageand application field when exchanging and sharing information. To achieve this, the BIM infor-mation classification, the criteria of property requirements for information exchange in BIMapplication field and the BIM library management system are developed. This study could con-tributes to ensuring the reliability and accuracy of results of BIM based analysis and to enhanc-ing the speed of business process with sharing and exchanging building information utilizing asingle BIM model. Key Words:Building Information Modelling (BIM), BIM library, Cost estimation, Energyanalysis, Property information