요소작업 기반 티어공법 철골조립 시뮬레이션 모델

임태경,손창백,이동은,Lim, Tae-Kyung,Son, Chang-Baek,Lee, Dong-Eun 대한건축학회 2011 대한건축학회논문집 Vol.27 No.10

This paper presents a simulation model that facilitates to analyze and estimate both time and cost of the steel erection operation making use of tier construction method. By conducting motion and time study, resource processes of the operation and their tasks of the processes are defined. These atomic tasks are used as a building block to implement a simulation model that reflects the real world steel erection operation assembling the steel material in the job site. Task based operation simulation model deals with local variables or delay factors affecting productivity and improves the reusability of existing production models. Therefore, the proposed approach allows the model to adjust more easily to construction method change. The proposed steel erection model was verified by comparing with the Construction Standard Production Unit system (CSPU) and daily work report.

확률.통계적 건설 프로젝트 영업이윤율 추정 시스템 개발

임태경,이동은,Lim, Tae-Kyung,Lee, Dong-Eun 대한건축학회 2011 대한건축학회논문집 Vol.27 No.11

This paper introduces a system called Stochastic Markup Estimation System (SME) for estimating optimum markup for a project. The system was designed and implemented to better represent the real world system involved in construction bidding. The findings obtained from the analysis of existing assumptions used in the previous quantitative markup estimation methods were incorporated to improve the accuracy and predictability of the SME. The existing methods have four categories of assumption as follows; (1) The number of competitors and name of the competitors are known, (2) A typical competitor, who is fictitious, is assumed for easy computation, (3) the ratio of bid price against cost estimate (B/C) is assumed to follow normal distribution, (4) the deterministic output obtained from the probabilistic equation of existing models is assumed to be acceptable. However, these assumptions compromise the accuracy of prediction. In practice, the bidding patterns of the bidders are randomized in competitive bidding. To complement the lack of accuracy resulted from these assumptions, bidding project was randomly selected from the pool of bidding database in the simulation experiment. The probability to win the bid in the competitive bidding was computed using the profile of the competitors appeared in the selected bidding project record. The expected profit and probability to win the bid was calculated by selecting a bidding record randomly in an iteration of the simulation experiment under the assumption that the bidding pattern retained in historical bidding DB manifest revival. The existing computation, which is handled by means of deterministic procedure, were converted into stochastic model using simulation modeling and analysis technique as follows; (1) estimating the probability distribution functions of competitors' B/C which were obtained from historical bidding DB, (2) analyzing the sensitivity against the increment of markup using normal distribution and actual probability distribution estimated by distribution fitting, (3) estimating the maximum expected profit and optimum markup range. In the case study, the best fitted probability distribution function was estimated using the historical bidding DB retaining the competitors' bidding behavior so that the reliability was improved by estimating the output obtained from simulation experiment.

품질기능전개 및 유전 알고리즘을 통합한 금속커튼월의 품질-비용 최적화 시스템 개발

임태경,이동은,Lim, Tae-Kyung,Lee, Dong-Eun 대한건축학회 2011 대한건축학회논문집 Vol.27 No.12

This paper presents a tool called Quality-Cost optimization system, which integrates Genetic Algorithm (GA) and Quality Function Deployment (QFD), for tradeoff between quality and cost of the unitized metal curtain-wall unit. A construction owner as the external customer pursues to maximize the quality of the curtain-wall unit. However, the contractor as the internal customer pursues to minimize the cost involved in designing, manufacturing and installing the curtain-wall unit. It is crucial for project manager to find the tradeoff point which satisfies the conflicting interests pursued by the both parties. The system would be beneficial to establish a quality plan satisfying the both parties. Survey questionnaires were administered to the external customer who have an experience of project installing curtain-wall, the architects who are the independent assessor to obtain, and the internal customer who were involved in curtain-wall design and installation. The Customer Requirements (CRs) and their importance weights, the relationship between Customer Requirements and Technical Attributes (TAs) consisting of a curtain-wall unit, and the cost ratios of each components consisting curtain-wall unit are obtained from the three groups mentioned previously. The data obtained from the surveys were used as the QFD input data to compute the Owner Satisfaction (OS) and Contractor Satisfaction(CS). Multi-objective optimization method using GA is applied to optimize resource allocation under limited budget when multi-objectives, OS and CS, are pursued at the same time. The deterministic multi-objective optimization method using GA and QFD is extended to stochastic model to better deal with the uncertainties of QFD input data and the variability of QFD output data. A case study demonstrates the system and verifies the system conformance.

ARENA 활용 사고사건 통합 건설공정 모델링

임태경(Lim, Tae-Kyung),이동은(Lee, Dong-Eun) 대한건축학회 2016 대한건축학회 학술발표대회 논문집 Vol.36 No.2

요소작업 기반 티어공법 철골조립 시뮬레이션 모델

임태경(Lim, Tae-Kyung),손창백(Son, Chang-Baek),이동은(Lee, Dong-Eun) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.10

This paper presents a simulation model that facilitates to analyze and estimate both time and cost of the steel erection operation making use of tier construction method. By conducting motion and time study, resource processes of the operation and their tasks of the processes are defined. These atomic tasks are used as a building block to implement a simulation model that reflects the real world steel erection operation assembling the steel material in the job site. Task based operation simulation model deals with local variables or delay factors affecting productivity and improves the reusability of existing production models. Therefore, the proposed approach allows the model to adjust more easily to construction method change. The proposed steel erection model was verified by comparing with the Construction Standard Production Unit system (CSPU) and daily work report.

설계ㆍ시공 일괄계약자(Design/Build Contractor) 선정을 위한 확률ㆍ통계적 품질기능전개 기법

임태경(Lim Tae-Kyung),손창백(Son Chang-Baek),이동은(Lee Dong-Eun) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.11

This paper introduces a system, Stochastic Quality Function Deployment (SQFD), which enables quality performance evaluators to estimate the Quality Performance of a Design/Build firm in a competitive bidding under Design/Build contract. The system complements the limitation of existing deterministic QFD by incorporating an algorithm finding out the best fit PDF automatically as well as simulation modeling and analysis method into QFD so as to efficiently deal with the randomness and uncertainty in the data processing relative to the quality performance of a D/B firm. The SQFD system retains the following features in supporting a decision-making relative to the multi-participants and multi-variables: (1) handling the uncertainty of the QFD input variables effectively by implementing the component that searches the best-fit-PDF from QFD input data automatically, (2) measuring the variability of QFD output data, which are SQPIs obtained from SQFD execution, by using the best-fit-PDF found, (3) facilitating data processing and statistical analysis by automating the SQFD system. The validity and reliability of the SQFD system were verified by testing with survey data obtained from experts in quality performance measurement of D/B project delivery system.

공정 시뮬레이션 모형의 재사용성 향상을 위한 싸이클론 모델러 개발

임태경(Lim Tae-Kyung),곽한성(Guak Han-Seong),신원상(Shin Won-Sang),김용우(Kim Yong-Woo),손창백(Son Chang-Baek),이동은(Lee Dong-Eun) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)

The existing web-cyclone system has limitations as follows: (1) it does not efficiently record and keep tracking operation models in a database, (2) these is no classification system which enable to classify similar operations, and categorize them, and (3) it is a syntax oriented modeling tool that does not support graphical user interface(GUI) therefore, it is difficult for project engineer on job-site to model and analyze a specific operation. This research presents a client/server based Cyclone Modeler to improve limitations mentioned above.

건설 노무자의 아차사고 측정 및 평가 방법론

임태경(Lim, Tae-Kyung),이상수(Lee, Sang-Soo),이동은(Lee, Dong-Eun) 대한건축학회 2014 大韓建築學會論文集 : 構造系 Vol.30 No.1

Near-misses which foretell danger signs for potential accidents provide valuable information for safety management on a job-site. Even thought a number of near-misses are caused by construction workers on a job-site everyday, it is difficult to use near-misses information to identify worker inherent risks and establish safety measures due to the absence of a clear definition and an evaluation method for the near-miss. This study aims to present a systematic methodology which effectively measures and analyzes near-misses occurred by a specific worker and provides a personalized safety guidance. This research was conducted as follows: firstly, the term of a near-miss was redefined by the literature survey and previous studies relative to quantifying the accident risk in the view of worker’s behavior were investigated; secondly, a standard motion taxonomy for near-misses was developed to facilitate monitoring the type and time of occurrence of the near-miss accident and near-miss weights along to the standard behaviors were obtained by survey analysis and then a mathematical model to calculate the near-misses index (NMI) was developed; finally, a case study was performed to evaluate the practicality of the proposed assessment model for near-misses of construction worker.

확률ㆍ통계적 건설 프로젝트 영업이윤율 추정 시스템 개발

임태경(Lim, Tae-Kyung),이동은(Lee, Dong-Eun) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.11

This paper introduces a system called Stochastic Markup Estimation System (SME) for estimating optimum markup for a project. The system was designed and implemented to better represent the real world system involved in construction bidding. The findings obtained from the analysis of existing assumptions used in the previous quantitative markup estimation methods were incorporated to improve the accuracy and predictability of the SME. The existing methods have four categories of assumption as follows; (1) The number of competitors and name of the competitors are known, (2) A typical competitor, who is fictitious, is assumed for easy computation, (3) the ratio of bid price against cost estimate (B/C) is assumed to follow normal distribution, (4) the deterministic output obtained from the probabilistic equation of existing models is assumed to be acceptable. However, these assumptions compromise the accuracy of prediction. In practice, the bidding patterns of the bidders are randomized in competitive bidding. To complement the lack of accuracy resulted from these assumptions, bidding project was randomly selected from the pool of bidding database in the simulation experiment. The probability to win the bid in the competitive bidding was computed using the profile of the competitors appeared in the selected bidding project record. The expected profit and probability to win the bid was calculated by selecting a bidding record randomly in an iteration of the simulation experiment under the assumption that the bidding pattern retained in historical bidding DB manifest revival. The existing computation, which is handled by means of deterministic procedure, were converted into stochastic model using simulation modeling and analysis technique as follows; (1) estimating the probability distribution functions of competitors’ B/C which were obtained from historical bidding DB, (2) analyzing the sensitivity against the increment of markup using normal distribution and actual probability distribution estimated by distribution fitting, (3) estimating the maximum expected profit and optimum markup range. In the case study, the best fitted probability distribution function was estimated using the historical bidding DB retaining the competitors’ bidding behavior so that the reliability was improved by estimating the output obtained from simulation experiment.

방수공의 생리학적 작업부하 평가

임태경(Lim, Tae-Kyung),박상민(Park, Sang-Min),이동은(Lee, Dong-Eun) 대한건축학회 2015 大韓建築學會論文集 : 構造系 Vol.31 No.6

Measuring and evaluating the workload occurred to construction worker have not been arrived at a certain maturity because it is not easy to standardize construction operations and these operations are subject to dynamic changes. This paper presents a method that measures quantitatively the workload demanding to the workers engaged in waterproof operation and tests for statistical significant differences among the unit tasks associated with the operation. Three hypotheses involved in the unit tasks (e.g., a primer painting and a polyurethane coating) are established as follows: [Hypothesis 1] Given a same amount of work, the average heart rate occurred to the worker engaged in the urethane coating task is higher than that in the primer painting task. [Hypothesis 2] Given a same amount of work, the average break time required to the worker engaged in the polyurethane coating task is longer than that in the primer painting task. [Hypothesis 3] When measured immediately after completing the two tasks, the body parts that the workers feel uncomfortable were arm (t = 2.449) with statistically significant difference; neck (t = 0.632), shoulder (t = 0.000), waist (t = 1.987) and wrist (t = 0.655) with statistically no significant difference.