BIM 소프트웨어 선정요인 분석

이치주(Lee Chi-Joo),이강(Lee Ghang),원종성(Won Jong-Sung) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.7

In this study, degree of support of main BIM functions was analyzed and relative importance and priority were analyzed by drawing out selection factors for selecting proper BIM software per business process. Main contents are as follows. First of all, BIM functions introduced in overseas construction related companies were analyzed in order to analyze main functions and limits of the current main BIM software. In addition, BIM functions required in domestic construction companies were drawn out and level of support at present was analyzed. Next, after drawing out selection factors for selecting BIM software, level of importance and priority were analyzed. Selection factors were drawn out in layers of upper level factors and lower level factors. In case of errors in degree of importance in integration of upper level factors and lower level factors, easiness of modification and mutual connectivity between objects and between drawings and objects were turned out as the highest. Finally, subjects of BIM introduction were classified in aspects of construction companies, design companies, research institutes, and schools and degree of importance was analyzed. Construction companies and design companies showed importance of factors of usability aspect as the highest and factors of business issues aspect were shown as the lowest. In viewpoints of researchers of research institutes and schools, it was found out in sequence of functionality and usability aspects and importance of business issues aspects was shown relatively higher than construction companies and design companies.

디자인 빌드(Design Build) 방식 건설 프로젝트의 성공요인 분석에 관한 연구 - 중.소규모 건설 프로젝트를 중심으로

이치주,김상기,김재준,Lee, Chi-Joo,Kim, Sang-Ki,Kim, Jae-Jun 한국건설관리학회 2007 건설관리 : 한국건설관리학회 학회지 Vol.8 No.5

국내 중 소규모 건설 산업은 시공분야를 중심으로 발전하여 왔으며 소프트분야가 상대적으로 취약하다. 또한 다양한 발주 체계가 활용되지 못하는 문제점을 안고 진행되고 있다. 더욱이 현재 국내 건설 프로젝트들은 자금력과 기술력을 갖춘 대형 건설업체들이 경쟁 우위를 점하고 있어 중 소규모 건설업체들의 입지가 줄어들고 있다. 최근국내 외 건설시장의 대형화, 고도화와 함께 기술집약적인 공사가 늘어감에 따라 기술경쟁이 가능한 설계시공일괄(Design-Build)방식의 건설 산업이 늘어나고 있는 추세이며 규모가 작은 중 소건설기업의 상황에서는 더욱 건설시장에서 효과적인 경쟁력을 보유하여야 할 것으로 예상한다. 이에 본 연구는 디자인 빌드 방식의 성공요인과 중 소규모 프로젝트 사례조사를 한 후 AHP 분석을 통해 성공요인 도출 및 중요도 분석을 함으로써 중 소규모 건설업체의 디자인 빌드 방식의 성공적 수행을 위한 중점 관리요인을 제시하고자 한다. 그리하여 향후 중 소 건설업체의 발전과 생산성 향상을 위한 기반을 제공하고자 한다. The minor construction companies in Korea have grown in focusing on the construction operation field. Also, soft field is vulnerable area, and there are not enough delivery systems, therefore, a capacity of the construction industry expansion and productivity is insufficient. Furthermore, the minor construction companies are losing their areas, because the major construction companies having numerous know-how and ample funds are competitive. As the construction industry are more larger and complicated, the design build methods might be increased in the construction industry and the minor construction companies could have more competitive. Hence, this paper analyzes the success factor in minor construction projects by design build methods focusing on instance $company^{\circ}{\phi}s$ case and survey, and critical success factor deduction and importance degree analysis of this factor using AHP analysis. In addition, this paper gives fundamental data how to manage the construction project effectively for minor construction $companies^{\circ}{\phi}s$ expansion in near future.

계층분석법(AHP)을 이용한 마감공정의 계획 및 관리요인 분석에 관한 연구 - 초고층 주거건축물 공사 건식벽체공법을 대상으로

이치주,김재준,이윤선,Lee, Chi-Joo,Kim, Jae-Joon,Lee, Yoon-Su 한국건설관리학회 2007 건설관리 : 한국건설관리학회 학회지 Vol.8 No.1

건설 산업의 새로운 부가가치 영역으로 초고층 주거건축에 대한 관심과 투자가 증가하고 있다. 이러한 초고층 건축물을 시공하는 과정에서 많은 작업들이 층별로 반복적이며 동시에 진행되는 마감공사는 업체별 공사 관리 능력에 따라 공기 차이가 발생하고 있고, 이는 전체 사업 공기에 큰 영향을 주고 있는 것으로 나타났다. 마감공사의 효율적 수행을 위해서는 초고층 주거 건축물 마감공사의 현장 특성을 고려한 작업의 생산성 영향요인을 도출하고 중요 요인에 대한 중점 관리의 필요성이 제기되고 있다. 생산성 영향요인에는 기술적 요소 외에도 마감공사의 프로세스를 계획하고 관리하는 많은 복합적인 요소들이 존재한다. 본 연구에서는 계층 분석적 의사결정 기법인 AHP 분석을 통해 마감공사 프로세스의 계획 및 관리 요인측면에서 생산성 영향요인의 중요도를 분석하였다. 이와 같이 중요도가 높게 나온 요인 중 잠재 개선 효과가 큰 요인들에 대한 중점 관리 및 연구를 수행한다면 마감공사의 생산성 영향요인에 대한 이해를 높여주는 한편 실무적 관리방향을 제시함으로써 건설기업의 체계적 인 생산성 관리에 기여할 수 있을 것이다. There is an increase in interest and investment in high-rise housing as it is perceived to be a new value-added market in the construction industry. In constructing a high-rise housing, the finishing works are executed in accompaniment with many other activities that are progressed repeatedly and spontaneously on each floor. It was reported that the duration of finishing works differs according to the management ability of the executing company and has a significant effect on the entire project duration. We suggest a need to concentrate on important management factors by analyzing the factors affecting the productivity of finishing works based on the site characteristics in high-rise housing. There are various complex productivity-affecting factors including the technical factors involved in planning and managing the processes of finishing works. From the viewpoint of planning and management factors, the importance of productivity-affecting factors was analyzed using the Analytic Hierarchy Process (AHP). A continuous examination of the management of high-importance factors will make it possible to improve productivity by enhancing the understanding of productivity-affecting factors of finishing works and suggesting a practical management direction.

마코위츠 포트폴리오 모형을 사용한 리츠 투자 포트폴리오 구성방법에 관한 연구

이치주,이강,원종성,함성일,Lee, Chi-Joo,Lee, Ghang,Won, Jong-Sung,Ham, Sung-Ili 한국건설관리학회 2010 한국건설관리학회 논문집 Vol.11 No.2

Domestic construction companies suffer from the difficulty in financing in the wake of economic slump at home and abroad. In the periods of this economic slump, which hit the nation REITs, the facilitator of fluid financing and the stimulating of construction economic, has increasingly been expanded since its introduction in 2001. But, REITs relatively falls behinds any other nations, in terms of its growth speed and marketing volume. The purpose of this research thesis is to suggest the method for composing a portfolio using Markowitz portfolio selection models for stimulating REITs. Main contents are as follows. First, the thesis made the comparative analysis on profit increase in REITs investment in application of models by Markowitz and REITs derivatives from 2007/07/03 to 2008/07/21 during investment analysis periods. The result showed that total profits by Markowitz model amounted to about 10 percent higher than average profits of REITs derivatives. Second, this thesis made the analysis on sensitivity of data-gathering and portfolio change periods of the existing profits, in order to measure the both periods and yield optimum profits. The six month data-collecting periods of profits accounted for some 16% higher profits than profits of REITs derivatives. In case when the two week periods of portfolio change accounted for some 11% higher profits than profits of REITs derivatives. 국내 외 경기 침체의 영향으로 국내 건설업체들은 자금조달의 어려움을 겪고 있다. 이러한 경기 침체기에 자금의 유동화와 건설경기의 활성화를 촉진할 수 있는 리츠 제도가 2001년에 도입되어 점차 확대되고 있지만, 비슷한 시기에 도입한 다른 나라에 비해 성장속도 및 시장규모가 작은 편이다. 본 연구에서는 리츠의 활성화를 위하여 보다 높은 수익률 확보를 위한 포트폴리오 구성 방법으로, 마코위츠 포트폴리오 선정 모형을 적용한 리츠 투자 포트폴리오 구성 방법에 대해 제안하고자 한다. 주요 내용은 다음과 같다. 첫째, 2007년 7월 3일부터 2008년 7월 21일까지의 투자분석기간 동안 마코위츠 모형을 적용한 리츠의 투자결과와 비교대상 리츠들의 평균 수익률을 비교하여 수익률 향상정도를 분석하였다. 그 결과 마코위츠 모형을 적용한 수익률이 비교대상 리츠들의 평균 수익률보다 약 10% 높게 나타났다. 둘째, 기존 수익률의 자료 수집기간과 포트폴리오 교체주기에 대한 민감도 분석을 하여, 최적의 수익률을 나타낼 수 있는 자료 수집기간과 포트폴리오 교체주기를 도출하였다. 수익률 자료 수집기간이 6개월 일 때 비교대상 리츠들의 평균 수익률보다 마코위츠 모형을 적용한 수익률이 약 16% 높게 나타났으며, 포트폴리오 교체주기를 2주 간격으로 설정하였을 때는 약 11% 높게 나타났다.

리츠와 건설경기, 부동산경기, 주식시장과의 관계 분석

이치주,이강,Lee, Chi-Joo,Lee, Ghang 한국건설관리학회 2010 한국건설관리학회 논문집 Vol.11 No.5

리츠는 주식시장에 상장되어 있으면서 부동산 개발을 위한 자금조달의 성격과 부동산에 투자하는 특징도 있으므로, 주식 시장과 건설 및 부동산시장과 관계가 있을 것으로 예상할 수 있다. 본 연구에서는 리츠와 주식시장, 건설 및 부동산 경기와 관계된 지표들을 시계열 분석하여, 리츠와의 영향관계를 분석하였다. 시계열 분석은 백터자기회귀모형과 백터오차수정모형을 사용하였으며, 다음의 세 부분으로 분류하여 분석하였다. 첫째, 리츠와 건설 코스피 지수와의 관계를 분석한 결과, 건설 코스피 지수가 리츠에 영향을 주는 것으로 분석되었다. 둘째, 리츠와 건설경기 동행지수인 건축착공면적, 부동산 경기 지수인 오피스 임대지수와 주택매매가격지수와의 관계를 분석하였다. 각 지표들은 서로 인과관계는 없는 것으로 분석되었지만, 리츠와 주택매매가격지수는 서로에게 영향을 주는 것으로 분석되었다. 셋째, 리츠와 건설경기 선행지수인 건축허가면적의 관계를 분석하였다. 두 지표는 서로 인과관계가 없는 것으로 분석되었지만, 건축허가면적이 리츠에 영향을 미치는 것으로 분석되었다. 본 연구를 통해 리츠는 주식시장과 주택경기, 건설경기 선행지표인 건축허가 면적에 영향을 받지만, 건설경기 동행지표인 건축착공면적과 오피스 임대지수에는 상대적으로 영향을 작게 받는 것으로 분석되었다. Even though REITs (Real Estate Investment Trusts) are listed on the stock market, REITs have characteristics that allow them to invest in real estate and financing for real estate development. Therefore REITs is related with stock market and construction business and real estate business. Using time-series analysis, this study analyzed REITs in relation to construction businesses, real estate businesses, and the stock market, and derived influence factor of REITs. We used the VAR (vector auto-regression) and the VECM (vector error correction model) for the time-series analysis. This study classified three steps in the analysis. First, we performed the time-series analysis between REITs and construction KOSPI(The Korea composite stock price index) and the result showed that construction KOSPI influenced REITs. Second, we analyzed the relationship between REITs and construction commencement area of the coincident construction composite index, office index and housing price index in real estate business indexes. REITs and the housing price index influence each other, although there is no causal relationship between them. Third, we analyzed the relationship between REITs and the construction permit area of the leading construction composite index. The construction permit area is influenced by REITs, although there is no causal relationship between these two indexes, REITs influenced the stock market and housing price indexes and the construction permit area of the leading composite index in construction businesses, but exerted a relatively small influence in construction starts coincident with the composite office indexes in this study.

부동산 프로젝트 파이낸싱의 리스크 인자 분석

이치주(Lee Chi-Joo),김상기(Kim Sang-Ki) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.2

The number of project financing has sevenfold increased between 2003 and 2007, in Korea. The number of project financing in worldwide has increased by 29.7% from 2005 to 2006. Therefore, there is a clear sign that the project financing is becoming common. However, in Korea, rather than project itself, the credit of construction firm is decisive factor for both the size of financial support and whether or not the project is carried out. Therefore it enlarges the business risk and brings about biased beneficiary. Especially, project financing consists of many business participants, so there are many possible risk factors and therefore high risk possibility. If we analyze and minimize these risk sources beforehand, strategic decision-making and high profitability business would be possible. In this research, we attempt to evaluate the factors by fuzzy theory that have effects on project financing of small & medium enterprises that have relatively smaller credit than large enterprise.

건축 외장유리 선정요인의 중요도에 따른 경제적 효과 분석

이치주(Lee Chi-Joo),이강(Lee Ghang) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.1

This study suggest a selection method for exterior glass with regard to energy efficiency, CO₂ emissions, and economics. First, it set up a hierarchy of factors for the selection of exterior glass and analyze their importance. As a result of the importance analysis, insulation is the highest importance factor, followed in order by economic and technical state, lighting, view, and others. Second, exterior glasses were classified for application in apartment buildings and office buildings based on the importance of selection factors, and then some types of exterior glass were selected for energy efficiency analysis. Third, this study analyzed energy efficiency, CO₂ emissions, and LCC(life cycle cost) after the selected glasses had been applied to actual office and apartment buildings. In cases in which two types of glass were applied to office buildings, the break-even points were 4 years and 14 years respectively, while the economic profits over 40 years were 2,536,332,214 won and 146,972,379 won. In cases where two types of glass were applied to apartment buildings, the break-even point was 1 year, and the economic profits over 40 years were 1,416,321,266 won and 130,760,294,093 won.

CM 업무에서 BIM 도입 우선항목 도출

이치주(Lee Chi-Joo),이강(Lee Ghang),원종성(Won Jong-Sung),윤성찬(Yun Sung-Chan) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.6

Although the number of projects applying Building Information Modeling (BIM) has increased, most construction industry groups that have adopted BIM are large construction corporations and architecture firms. BIM has had small effect because most of the application areas have been reviewed in part for construction error and clash detection. This study analyzed the necessity of original task improvement and the expected effect of BIM adoption in high-rise buildings in the increasing market size of Construction Management (CM) corporations. It also considered standards that have been suggested for BIM adoption. First, eight items were reclassified from the perspective of task-oriented action for the CM tasks of the Construction Management Association of America (CMAA), and high-priority tasks for improvement were derived from the perspective of productivity. Next, the expected effect of BIM adoption was investigated from previous studies and survey, and its applicability was analyzed in original tasks that need improvement. Although a detailed application method was not suggested for the potential improvement of tasks and lacked expert for survey, this study will provide standards to be considered by CM corporations that might investment in the adoption of BIM. Furthermore, the reclassified CM tasks could be used not only in the construction of high-rise buildings, but also that of other buildings.

건설시장 시나리오 분석에 따른 중ㆍ소 건설업체의 대응전략

김상기(Kim Sang-Ki),이치주(Lee Chi-Joo),이강(Lee Ghang),김재준(Kim Jae-Jun) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.4

To be contrast past which supply ahead of demand and institutional entry barrier built present which uncertainty and instability is raised, for achieving business result it is necessary with differentiation resources and grasping who is competitor who is customer. Especially small and medium-sized firms in trouble with funding have to be faithful to customer satisfaction and managing customer to attain the constant market demand. But problem related with row-price order and worse profit causes deficient investment in managing customer. Who confront with this uncertain construct market small and medium-sized firms have to set up self-strategy with analyzing customer/orderer relationship and possibly outbreakable scenario. This research adopting scenario planning technique and design of experiment is looking through core-issues raised connected with managing customer of small and medium-sized construct firms and analyzing the effect cause, after submitting scenario for highly probable future situation in vision of customer, estimated and evaluated through the design of experiment. And presenting the strategy direction to confront with scenario situation it can be use to be a database for analyzing of customer/orderer/building-owner for small and medium-sized firms.