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.

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.

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.

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.

준실험설계에 의한 코로나19 지원정책의 고용효과 분석 : 소상공인.자영업자를 위한 직접지원금을 중심으로

임태경(Lim, Taekyoung) 한국지방정부학회 2020 지방정부연구 Vol.24 No.3

본 논문은 코로나19 사태로 인한 소상공인･자영업자를 위한 직접지원금의 집행이 숙박･음식업계의 취업률 증가의 동인으로 영향되었는지를 실증적으로 분석하였다. 2020년 1월부터 2020년 6월까지 총 6개월의 단기간 패널자료를 토대로 준실험 설계의 일종인 이중차분법(Difference in Difference, DID)을 사용해 소상공인･자영업자를 위한 직접지원금의 집행이전･이후와 소상공인･자영업자를 위한 직접지원금이 지원된 지역과 그렇지 않은 지역간의 집단 간 비교분석을 통해 대면산업의 대표 분야인 숙박 및 음식업계의 취업률에 대한 효과성을 측정하였다. 분석결과 코로나19로 인한 소상공인 및 자영업자의 위기극복을 위한 직접지원금의 집행이 시작된 3월 이후의 시점과 숙박음식업계의 취업률과는 실증적으로 인과관계가 존재함을 확인할 수 있었다. 하지만 직접지원금의 집행이 시작된 3월 이후부터 5월 이후의 효과는 시간이 지남에 따라 점점 줄어드는 경향을 확인할 수 있었다. 이러한 분석결과는 소상공인 및 자영업자들의 위기극복을 돕기 위한 지자체들의 정책 개입이 코로나19 사태로 인한 고용악화를 부분적으로 완화하고 있다는 실증적인 증거로 판단될 수 있겠다. 최근 코로나19에 관련된 3차 추경이 편성되면서 지원금 투입이 어떤 효과를 유발했는지 불분명하고 기존에 관련된 실증연구가 없는 실정에서 본 연구는 코로나19 대응 정책의 효과성이 존재하는지의 여부를 단기적인 측면에서 실증적으로 분석했다는 점에서 연구의 의의를 찾을 수 있을 것이다. 뿐만 아니라 최근 정책분석 분야에서 광범위하게 활용되고 있는 이중차분(DID) 분석기법을 활용하여 정책지원의 인과적 효과를 분석했다는 점에서 학술적 측면에서도 연구의 의의를 찾을 수 있을 것이다. This paper assesses the quantitative impact of government interventions on job growth in the small businesses in South Korea related to the COVID-19. This study focused particularly on the case study of ‘Direct Subsidies’ supported from local government in order to recover labor market in small business sector and its impact on job growth. Specifically, this research demonstrates empirically a research question: How does the ‘Direct Subsidies related to the COVID-19’ planned from local government affect the labor mark to recover from unemployment and recession at the local level in South Korea? With using a panel dataset with the 17 metropolitan cities of South Korea during the period from 2020 January to 2020 June, the statistical modeling framework most closely aligned with the postulated causal process, and supportable with available data, was a difference-in difference(DID) methodology. The results of DID model are showing that the ‘Direct Subsidies related to the COVID-19’ has had statistically significant positive effects after its supported on the job growth in the small businesses. Otherwise, findings from this study provide empirical evidences that both effects of post-and-treatment did significantly impact negatively to job growth in the small businesses. This results have been reflected the economic downturn generated from COVID-19 outbreak or pandemic situation. The importance of this research stems from recognition that it is importance to evaluate the effectiveness of the ‘Direct Subsidies related to the COVID-19 in terms of stimulating job growth in the viewpoint of short-term. These finding can be informative for governments in responding to future COVID-19 outbreaks.

무선 홈네트워크 환경에서 안전한 양방향 인증 메커니즘에 관한 연구

임태경(Tae-Kyoung Lim),서시오(Si-O Seo),조승표(Seung Pyo Cho),양성현(Sung-Hyun Yang),조충호(Choong-Ho Cho) 한국통신학회 2007 한국통신학회 학술대회논문집 Vol.2007 No.7

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.

혁신도시 개발정책이 청년인구 유입에 미치는 영향에 관한 연구 : 충북혁신도시 사례를 중심으로

임태경 ( Taekyoung Lim ) 한국지방행정연구원 2021 地方行政硏究 Vol.35 No.4

The purpose of this research was to evaluate the effectiveness of the policy of “Innovative City” on the population influx in young adults population aged 20 to 39. This paper aims to fill the research gap by evaluating to view the young adults population movement as effectiveness of the policy of “Innovative City.” Specifically, this research demonstrates empirically research questions: How do the policy of “Innovative City” affect population influx into young adult? What factors have caused to affect young adults population influx? With using a panel dataset, the statistical modeling framework most closely aligned with the postulated causal process, and supportable with available data, was a difference-in difference (DID) methodology. The results of DID model are showing that the policy of “Innovative City“ has had statistically significant positive effects on the young adults population influx since 2016 to be completed the “Innovative City“ construction. Simultaneously, findings from this study provide empirical evidences that both effects of post-and-treatment did also significantly impact to population influx in young adults. The importance of this research stems from recognition that it is importance to evaluate the effectiveness of the policy of “Innovative City” in terms of simulating influx of young adults population aged 20 to 39. These finding can be informative for governments in responding to future mechanism on the decentralization policy in South Korea.

지역경제 활성화에 대한 청년인구 유입의 효과성분석 : 충북혁신도시 사례를 중심으로

임태경(Taekyoung Lim) 한국지방행정학회 2021 한국지방행정학보 (KLAR) Vol.18 No.3

본 연구의 목적은 혁신도시로 유입된 청년인구가 지역경제 활성화에 어떠한 영향력을 미치고 있는지를 실증적으로 분석하는 것이다. 이를 위해 2008년부터 2018년 까지 총 11년간의 패널자료를 구축하여 혁신도시 지역과 비혁신도시 지역을 구분하여 청년인구의 순유입효과를 측정하는데 연구의 초점을 맞추었다. 분석결과, 혁신도시 조성사업이 본격화 되면서 준공된 이후 시점에 수도권 지역에서 혁신도시로 순유입된 청년은 지역경제 활성화에 긍정적인 영향을 주는 것으로 나타났으며, 동시에 비수도권과 수도권 지역간의 인구 불균형 문제를 해소하기 위해 실시된 혁신도시 조성 정책이 혁신도시와 비혁신도시 간의 지역내 청년인구 유입의 불균형 효과를 발생시키고 있음을 확인할 수 있었다. 인구가 지속적으로 감소하고 인구절벽, 지방소멸이라는 우려가 확산되면서 청년인구의 유입 및 정착이 지역의 경제를 다시 활성화 시킬 수 있는 핵심고리로 언급되고 있는 실정에서, 본 논문의 분석결과는 청년인구가 수도권에서 혁신도시로 이동함에 따라 지역경제 활성화 효과를 이끌어다는 결과를 실증적으로 확인했다는 점에서 연구의 차별성을 가지며, 앞으로 수도권 지역으로부터 혁신도시로의 청년인구 순유입을 지속적으로 증가시키기 위한 정책적 방향성과 청년인구 유입의 불균형 현상을 해소하기 위한 구체적인 정책적 대안을 제시했다는 점에서 연구의 의의를 찾을 수 있을 것이다. The purpose of this study was to empirically analyze the influence of the influx of people aged 20-39 years on the regional economic growth. The analysis was based upon the construction of panel data for a total of 11 years between 2008 and 2018 focused on the case of Chungbook Province as an Innovative City. City-level characteristics including influx of the youth population and industry circumstances are shown to be empirically important factors of variation in regional economic growth. Especially, the analytical evidence indicates that people aged 20-39 years moved from metropolitan area to Innovative City located in Chungbook Province led to stimulate regional economic growth. Neither has any study provided an empirical study in terms of the effectiveness of the inflow of the youth on regional economic growth even though the inflow of the youth can mention as a key factor for revitalizing the local economy. In this reagard, this research can be contributed to suggests meaningful policy directions vis-a-vis population imbalance and immigration of people aged 20-39 years.

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.