측정지표에 따른 건설생산성 비교

이치주(Lee, Chijoo),이강(Lee, Ghang),원종성(Won, Jongsung) 대한건축학회 2019 大韓建築學會論文集 : 構造系 Vol.35 No.4

To improve productivity in the architecture, construction and engineering industry, it is critical to understand both current and historic trends in construction productivity. This study analyzes and compares construction productivity trends of South Korea, the U.S., the U.K., and Japan 1995 to 2015 using the following three measures: construction labor productivity, construction duration per floor, and construction duration per 1,000 m2 floor area. As the results, the international competitiveness of each country varied according to which measures were used to analyze them. Among the four countries, the construction labor productivity of the U.S. was the highest, followed by that of South Korea. South Korea also had the second highest productivity growth rate, following that of Japan. On the other hand, when analyzed from the perspective of construction duration, the construction productivity in South Korea appeared relatively lower than those of other countries. There were differences in the location of construction competitiveness of each country analyzed by various measures. Therefore, to accurately diagnose and improve the construction competitiveness in South Korea, strategies based on various measures are need to established simultaneously.

우수 중소건설기업의 선정 및 육성방안 연구

이치주 ( Lee Chijoo ) 한국건설경제산업학회 2023 건설경제산업연구 Vol.9 No.1

정부의 정책이 건설산업에 안착하기 위해서는 건설산업에서 비중이 큰 중소건설기업이 정책 변화에 잘 적응하는 것이 중요하다. 하지만, 자금력이 부족한 기업들은 정책변화에 적응하는데 많은 시간이 소요된다. 이 연구에서는 건설산업의 환경과 정책 변화에 중소건설기업이 적응하는 것에 도움을 주기 위하여 중소건설기업 육성방안을 강소 건설기업과 생활밀착형 중소건설기업으로 분류하여 제안하였다. 강소 건설기업은 생산구조 개편에 따라 국내 시장진출을 확대하고자 하는 기업과 해외 시장으로 진출하고자 하는 기업, 그리고 기술개발 및 사업화를 목표로 하는 기업을 대상으로 한다. 생활밀착형 중소건설기업은 국민 개인이 발주하는 국민 생활에 밀착된 소규모 공사를 수행하는 기업이다. 그 기업에 대한 신뢰할 수 있는 정보를 제공하여 건설산업에 대한 전문지식이 부족한 국민 개인이 직접 공사를 발주하는데 도움을 주는 것을 목표로 한다. 생활밀착형 기업의 지원방안은 인증기업 공표와 보증수수료 할인, 전문지식 컨설팅으로 구성된다. 정부가 인증하는 기업 인증제도 중에서 건설기업을 대상으로 하는 것은 드물다. 이 연구에서 제안한 우수 중소건설기업 육성방안의 활성화를 위해서는 법제화된 인증제도 수립에 대한 연구가 필요하다. For the government's policy to take root in the construction industry, it is important for small and medium-sized construction companies, which account for a large portion of the construction industry, to adapt well to policy changes. However, companies with limited funding power take a lot of time to adapt to policy changes. In this study, in order to help small and medium-sized construction companies adapt to change of environment and policy in the construction industry, a plan for fostering small and medium-sized construction companies proposed by dividing them into small hidden champion and life-friendly company. The small hidden champion companies target companies that want to expand their business field in domestic construction market based on a reorganization of construction industry’s production structure, advance into overseas markets, and develop and commercialize of construction technology. The life-friendly companies carry out small-scale construction projects that are closely related to people's lives and ordered by people. The goal is to provide reliable information about life-friendly companies to help people who lack expertise in the construction industry when people order a construction project. The support plan for life-friendly companies are announcement of certified companies, discounts on guarantee fees, and consulting of professional knowledge. Among the corporate certification systems of government, it is rare to target construction companies. For the proposed activating the fostering plan of excellent small and medium-sized construction companies, the study on the establishment of a legislated certification system is need.

화재정보 확인과 대피자 위치추적을 위한 서버 독립형 시스템 개발

이치주 ( Lee Chijoo ),이태관 ( Lee Taekwan ) 한국건축시공학회 2021 한국건축시공학회지 Vol.21 No.6

If a fire breaks out in a building, occupants can evacuate more rapidly if they are able to identify the location of the fire, the exits, and themselves. This study derives the requirements of system development, such as distance non-limitation, a non-additional device, a non-centralized server system, and low power for an emergency, to identify information about the fire and the location of evacuees. The objective is to receive and transmit information and reduce the time and effort of the database for location tracking. Accordingly, this study develops a server-independent system that collects information related to a building fire and an evacuee’s location and provides information to the evacuee on their mobile device. The system is composed of a transmitting unit to disseminate fire location information and a mobile device application to determine the locations of the fire and the evacuee. The developed system can contribute to reducing the damage to humans because evacuees can identify the location of the fire, exits, and themselves regardless of the impaired server system by fire, the interruption of power source, and the evacuee’s location. Furthermore, this study proposes a theoretical basis for reducing the effort required for database construction of the k-nearest neighbor fingerprint.

계약 조항의 애매모호성에 의해서 발생되는 공기지연 클레임의 책임 당사자 확인 프로세스

이치주 ( Lee Chijoo ),권태욱 ( Kwan Taewook ),고훈석 ( Koh Hoonsuk ) 한국건축시공학회 2020 한국건축시공학회지 Vol.20 No.6

This study analyzed main causes of claims in EPC/Turnkey projects. For this purpose, this study referred to the FIDIC silver book, which lists the international standard contract conditions for EPC/Turnkey projects. The most frequent cause of claim was delay. A process was then proposed to determine whether the owner or contractor was the responsible party when the delay claim occurred. The proposed process was for damages for delay which is the conditions of contract for indemnities against delay claim. The process was based on conditions of the contract of two previous EPC/Turnkey projects that were constructed in 2010, the FIDIC silver book, as well as the obligations of owner and contactors. The proposed process is applicable depending on the conditions of the contract and the owner’s meaning. Furthermore, by identifying the responsible party, this study will contribute in identifying the possible claim types before concluding a contract and writing the specific contract.

민간참여 공공주택건설사업의 수익률 분석기준 도출

이치주(Lee, Chijoo) 대한건축학회 2022 대한건축학회논문집 Vol.38 No.6

Public institutions invest in land costs while construction companies invest in construction costs; the profit gained from sales is then distributed among them based on an investment ratio for private participation regarding public housing and construction types. However, when profit distribution takes place the factors that impact the earnings rate are not considered. This study derives analysis criteria for the earnings rate of construction and land costs, financial loss from unsold housing, and the profit distribution difference between private participation type and public housing type construction. Upon analysis of earnings rate changes without criteria being considered, the earnings rate did not reflect the actual cost of a project; it was observed that fair profit distribution was difficult. Additionally, when the construction costs for basic types were applied in cities with high land costs and national concerns, the risk of unsold housing decreased while the earnings rate increased. Thus, a contract type project is a potential method to increase the earnings rate for public institutions in a city. The analysis criteria of the earnings rate proposed in this study can be used to further establish profit distribution criteria between public institutions and construction companies based on the city and project type.

업무분야 규제의 폐지에 따른 종합 및 전문건설사업자들의 상호시장 진출 수준 분석

이치주,강형주,문혁,김민철,Lee, Chijoo,Kang, Hyeongjoo,Moon, Hyuk,Kim, Minchul 한국건설관리학회 2020 한국건설관리학회 논문집 Vol.21 No.2

건설산업의 경쟁력 향상을 위하여 업역규제가 폐지되었으며, 종합 및 전문건설사업자들이 상호시장에 진출할 수 있게 되었다. 정부에서는 후속단계로, 세분화된 업종을 대분류하는 업종체계의 개편을 준비 중이다. 업역규제의 폐지가 건설산업에 미치는 영향을 분석한 자료가 있다면, 업종개편을 단계적으로 적용하기 위한 범위의 결정에 도움을 줄 수 있을 것이다. 본 연구는 상호시장 진출의 가능성이 높은 종합 및 전문건설사업자들의 업종들을 도출한 후, 시장규모를 분석하여 업역규제의 폐지 효과를 설명하고자 한다. 먼저, 과거에 수행한 공사들의 연계성과 등록기준의 유사성을 기반으로, 종합건설사업자들이 진출 가능한 전문공사를 분석하였다. 분석결과, 15개의 전문공사에 진출할 수 있었으며, 시장규모는 2017년 전문공사의 총 수주금액인 약 96조원의 약 82%(78.8조원)으로 분석되었다. 다음으로, 업무내용의 관련성을 기반으로 전문건설사업자들이 진출할 가능성이 높은 종합공사와 시장규모를 분석하였다. 분석결과, 4개의 종합공사에 진출할 수 있는 시장규모는 2017년 종합공사의 총 수주금액인 약 190조원의 약 13%(24.7조원)으로 분석되었다. 본 연구의 분석결과에서는 종합건설사업자가 전문공사 시장으로 진출할 가능성이 전문건설사업자가 종합공사 시장으로 진출할 가능성이 더 클 것으로 나타났다. 하지만, 본 연구는 업종별 업무내용과 등록기준, 업역규제가 폐지되기 전의 공사실적을 기반으로 분석한 한계가 있다. 향후에 업종별 업무내용과 등록기준이 변경된다면, 본 연구의 결과와 차이가 있을 수 있을 것이다. The regulation of business area was abolished to improve the competitiveness of the construction industry and the ability of general and specialty contractors to enter the mutual market. As the next step, the government is preparing for a reorganization of business type. If the impact of the abolishing of business area on the construction industry is analyzed, the result can contribute to determining the step by step application scope of the reorganization of business type. This study derived the business types having a high probability of the mutual market entry of general and specialty contractors. Then, the size of mutual market entry is analyzed. First, the connection between the general and specialty construction, and the similarities between the registration standards of general and specialty construction are analyzed. Based on the result, a general contractor can enter 15 business types of specialty construction, and the market size is about 78.8 trillion KRW. This is about 82% of the total contract cost of specialty construction during the year 2017 (about 96 trillion KRW). Next, based on the relevance of business contents, the market size when general contractors enter the specialty construction market is analyzed. As a result, the market size is about 24.7 trillion KRW, and this is about 13% of total contract cost of general construction during the year 2017 (about 190 trillion KRW). Based on the result of this study, there is a higher probability of the mutual market entry of general contractors into specialty construction than vice versa. However, the result of this study is based on the current contents of business types, registration standards, and construction data of before abolishing the regulation of business area. This is a research limitation. If the business contents and registration standards are changed in the future, the result could differ from the current result.

건설 자동화 장비 도입을 위한 기술도입 영향요인 분석

이치주,이강,심재광,Lee, Chijoo,Lee, Ghang,Sim, Jaekyang 한국건설관리학회 2013 한국건설관리학회 논문집 Vol.14 No.2

안전사고와 민원이 많은 건설현장에서 새로운 건설기술, 특히 자동화 장비가 적용되는 경우는 드물다. 본 연구에서는 건설 자동화 장비의 적용 가능성을 높이기 위하여 고려하여야 하는 기술도입 영향요인들을 도출하고 분석하였다. 먼저, 영향요인들을 기술과 비기술 요인으로 분류하고, 기술요인을 사용성과 기능성 요인으로, 그리고 비기술 요인을 비용, 공사특징, 조직요인으로 분류하였다. 다음으로, 전문가 설문을 통하여 각 영향요인들의 중요도와 실현 가능성을 분석하였다. 사용성과 기능성이 중요도와 실현 가능성이 모두 높은 요인으로 분석되었다. 또한, 영향요인들의 중요도와 실현 가능성에 대한 건설사와 장비 개발사의 관점 차이를 분석하였다. 사전관계와 운전자 태도, 구성원들 의지, 공사품질들은 모두 건설사가 장비 개발사보다 더 높게 인식하고 있었다. 본 연구의 결과를 기반으로 장비 개발사는 건설사와의 관점 차이를 인지하고, 건설사가 중요하게 생각하는 요인들을 중심으로 개발하여야 할 것이다. 또한 본 연구의 결과는 자동화 장비 개발 사전 단계에서 적용할 수 있는 평가기준으로 활용될 수 있을 것이다. New construction technologies, especially automated equipment, are rarely deployed on a construction site where many accidents and claims occur. This study analyzed and derived impact factors for technology adoption to improve the chance of adopting automated construction equipment to the field. First, impact factors were classified into functional and non-functional factors. Then the functional factors were divided into usability and functionality factors, and the non-functional factors into cost, construction property, and organization factors. Next, the importance and realization possibility of each impact factor were analyzed through a survey with experts. Usability and functionality were analyzed to have the highest importance and realization possibility. Lastly, the differences between construction companies and equipment development companies in the importance and realization possibility of each factor were analyzed. Construction companies recognized previous relationship, operator's attitude, members' will, and construction quality more important than equipment development companies.. The equipment development companies should consider these differences between the view of construction companies and that of equipment development companies on the impact factors. The result of this study can be used as a basis for evaluating for automated construction equipment in the preliminary development phase.

암센터 의료시설의 설계변경과 하자보수의 감소를 위한 중점 관리공사 분석

이치주,이강,심재광,Lee, Chijoo,Lee, Ghang,Sim, Jaekyang 한국건설관리학회 2013 한국건설관리학회 논문집 Vol.14 No.5

의료시설은 일반건축물 보다 공사의 복잡성이 높고, 정부규제가 엄격하여 공사 단계에서의 설계변경과 하자보수들이 많이 발생한다. 본 연구에서는 의료시설의 중점 관리공사와 요인들을 도출하고 분석하여, 설계단계와 공사단계에서 관리가 잘 되지 않는 공사들을 분석하였다. 그리고 2013년 현재 진행되고 있는 의료시설 공사 관리자들의 인식을 조사하여, 개선 가능성이 큰 공사를 도출하였다. 먼저, 중점 관리요인들을 건축과 설비, 그리고 전기의 세 분야로 분류하여 도출하였다. 다음으로, 1) 공사 진행단계에서 설계변경이 많이 발생하고, 2) 하자보수들이 많이 발생하고 소요비용이 큰 중점 관리공사와 요인들을 분석하였다. 마지막으로, 진행 중인 의료시설 공사 관리자들이 중요하게 생각하지 않는 공사를 조사하였다. 설계변경과 하자보수가 많지만, 중요하게 생각하고 있지 않다면 개선 가능성이 클 것이기 때문이다. 설계단계에서는 마감공사, 벽체공사, 창호공사, 사무 자동화 및 통신기능 공사, 조명공사, 그리고 공사 관리단계에서는 폐기물 공사, 사무자동화 통신기능, 창호공사, 오염관리, 배관공사로 분석되었다. 본 연구의 결과인 설계변경과 하자보수가 많은 공사, 그리고 개선 가능성이 큰 공사의 관리를 실시 설계단계와 공사 관리단계에서부터 집중 관리하여야 할 것이다. The complexity of constructing medical institutions is higher than that of general buildings, and many change orders in the design and defect repairs in the construction phase are required due to strict government regulations. The priority control of constructions and impact factors of medical institutions were analyzed in this study, and difficulties in the control in the design and construction phase were identified. First, the priority management factors that were identified were as follows: architecture, facilities, and electricity. Second, 1) priority management in constructions and factors resulting in change orders and 2) priority management in constructions involving defect repair were analyzed. Third, the importance recognized by the construction managers were analyzed. The priority management in constructions and factors that were recognized by the construction manager were deducted as having low importance, although there were many change orders and defects. The work of finishing, wall building, joining, office automation and communication function, and lighting were analyzed in the design phase, and waste, the office automation and communication function, ceilings, contamination control, and plumbing were analyzed in the construction phase. The results showed that there will be a decrease in change orders and defects if the concentration of the manager was elevated and priorities were managed.

경제적 투자효과의 예측 정확도 향상을 위한 실질할인율 분석

이치주,이을범,Lee, Chijoo,Lee, Eul-Bum 한국건설관리학회 2015 한국건설관리학회 논문집 Vol.16 No.1

투자에 의해 기대되는 경제적 효과는 실질할인율의 자승으로 매년 나누어서 현재가치로 전환된다. 따라서 실질할인율이 경제성 분석결과에 미치는 영향은 다른 요인들보다 크다. 실질할인율을 예측하는 기존의 일반적인 방법은 과거 특정기간의 평균값을 적용하는 것이다. 본 연구에서는 실질할인율의 예측 정확도를 향상시키기 위한 방법을 제안하였다. 먼저 실질할인율을 구성하는 기업대출 이자율과 소비자 물가지수에 영향을 미치는 경제변수들을 도출하였다. 기업대출 이자율에 영향을 주는 변수들로는 콜 금리와 환율, 소비자 물가지수에 영향을 주는 경제변수는 생산자 물가지수를 선정하였다. 다음으로 실질할인율과 선정된 변수들과의 영향관계를 검정하였다. 영향관계가 존재하는 것으로 분석되었다. 마지막으로 관련된 경제 변수들을 기반으로 2008년부터 2010년까지의 실질할인율을 예측하였다. 예측 결과의 정확도는 실측값과 평균값의 결과와 비교되었다. 실측값이 적용된 실질할인율은 -1.58%였으며, 예측 값은 -0.22%, 평균값은 6.06%으로 분석되었다. 본 연구에서 제안한 방법은 금융위기와 같은 특수 상황을 고려하지 않은 것이지만, 평균값보다 예측 정확도가 크게 우수한 것으로 분석되었다. The expected economic effect by investment was divided by square of real discount rate annually for change to present value. Thus, the impact of real discount rate on economic analysis is larger than other factors. The existing general method for prediction of real discount rate is application of average data during past certain period. This study proposed prediction method of real discount rate for accuracy improvement. First, the economic variables which impact on interest rate of business loan and consumer price of real discount rate were determined. The variables which impact on interest rate of business loan were selected to call rate and exchange rate. The variable which impact on consumer price index was selected to producer price index. Next, the effect relation was analyzed between real discount rate and selected variables. The significant effect relation were analyzed to exit. Lastly, the real discount rate was predicted from 2008 to 2010 based on related economic variables. The accuracy of prediction result was compared with actual data and average data. The real discount rate based on actual data, predicted data, and average data were analyzed to -1.58%, -0.22%, and 6.06%, respectively. Though the proposed method in this study was not considered special condition such as financial crisis, the prediction accuracy was much higher than result based on average data.