• 한국안전학회지
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• 제29권2호
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• pp.53-61
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• 2014

This study evaluated wind loads considering a local basic wind velocity and construction periods to define the level of applied wind loads for system supports. Structural responses of system supports were examined and compared to those of system supports with the level of wind loads following various standards and specifications for permanent and temporary structures. And, the maximum combined stress ratios were estimated to evaluate the structural safety of a considered system support. From results, it was found that the wind load level should be applied in accordance with construction periods when estimating the safety of system supports. Looking into the response by change of the basic wind velocity according to local regions, it is no need to consider wind loads in regions with the basic wind velocity of 30 m/s. However, it was analyzed that wind loads should be considered in the regions with the basic wind velocity of 40 m/s or above. In addition, wind loads should be considered in designing system supports located at the region with the basic wind velocity of 35 m/s starting from construction period of 1.5 years. The standard specification for temporary work was analyzed as an incorrect standard in evaluating wind loads, since it underestimated the response of system supports in accordance with the local basic wind velocity and construction periods.

• 한국건설관리학회논문집
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• 제23권6호
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• pp.3-14
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• 2022

현장에서 발생하는 정량적인 공사 인원과 기간의 분석은 새로운 적정 인원의 기준을 제시할 수 있다. 본 연구는 업무효율 지표들 중 가장 중요한 요소인 업무절차의 수행시간을 예측하는 대기행렬 모형을 제시한다. 아파트 골조공사 작업 사이클은 같은 공정이 반복되는 특성을 가진다. 본 연구는 이러한 특성을 바탕으로 지연된 골조공사 기준층 사이클을 대기행렬 모형을 활용하고 그것을 분석하였다. 그리고 인원수와 공사 기간을 조정한 후 모형의 성능을 분석하였다. 본 연구는 대기행렬의 성능 분석을 실시하여 공정의 물량에 따른 인적자원관리 의사결정을 지원하고자 한다.

• 한국건축시공학회지
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• 제21권6호
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• pp.641-652
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• 2021

화성성역의궤에는 화성성역에 대한 상세정보가 기록되어 있으나, 현대적 건설관리 관점에서 분석과 평가는 제한적으로 진행되었다. 이에 본 연구에서는 팔달문을 대상으로 하여 시간, 비용, 인력 등 건설관리 관련 정보를 분석하였다. 팔달문 건설에 주요공종은 기초공사와 석공사였고, 전체 공기는 6개월로 전체적으로 매우 빠르게 공사가 진행되었다. 팔달문 건설의 소요비용의 총합은 약 52,423냥인데, 자재비에 약 15,9332냥이 소요되고, 인건비에는 약 36,4901냥이 소요되었다. 이를 현재가치로 환산하면, 자재비 약 11억원, 인건비 약 25억원으로 합은 약 36억원 수준이다. 향후에 공종별 작업 기간과 연계된 상세 투입인력 도출 등 추가적인 연구를 진행할 예정이다.

• 건축역사연구
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• 제18권1호
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• pp.91-111
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• 2009

The purpose of this study is to analyze paejang system of the castle constructions In the late period of Chosun dynasty. Moreover, this study aimed to examine effects and influences of its constructional productivity. The results are as follow; 1. Paejang was originally a sort of military positions. Thereafter it had been adopted to the various fields like soonrapaes. Pae, which was a regular working unit organized with $30{\sim}50$ laborers, took charge of the works allocated with its own chargeable section. 2. The first adoption of paejang system was found at the construction of Ganghwa-oyseong in 1690. Since the period of King Yeongjo and Jeongjo, it was generally used as a working system. 3. Yoo Hyeongwon had early suggested that this system should be adopted as a reformative system because it had a perfect command system like Soko-je, the provincial military system. 4. At the constructions of Dongnae-upseong, Jeonjoo-upseong and Daegoo-upseong in the period of King Yeongjo, paes were organized to $40{\sim}60$units, and worked in the fields of masonry, carnage and picking of stones. 5. At the construction of Soowon-seong in the period of King Jeongjo, a large number of various paejangs participated in all of working fields. Especially masonry-paes were usually organized with over 100 units. 6. It was estimated that paejang system surely could guarantee saving labors and term of works. Moreover, it was a basis for the further development form of dogup-je, a contracted work system. 7. Paejang system was applied in the constructions of Buddhist temples since the middle period of 1700s and later, it was widely used in the constructions of palaces.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 봄 학술논문 발표대회
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• pp.289-290
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• 2021

The PC system has advantages in terms of project management, such as shortening the construction period and reducing costs. However, it is difficult to activate the technology due to insufficient application of the technology. Therefore, there is a need for a strategy to expand and activate the PC system. This study is a basic research for PC construction project management, and its purpose is to derive the entire construction process from factory production of PC components to on-site construction. In this study, the construction process of the PC system was derived through literature review, and the main matters for the construction process management of PC system were confirmed in the analysis process. In the future, the results of this study are expected to be used as basic data for research for PC project management, such as deriving construction classification and calculating construction periods.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 봄 학술논문 발표대회
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• pp.161-162
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• 2023

The construction inspection is conducted by the contractor or construction supervisor after a certain stage of work has been completed. As the consturction inspection task is dependant on construction schedule, however, it is difficult to plan inspection task systematically, resulting in increased supervision costs, delays in construction, and disputes. Therefore, this study aims to integrate inspection work with schedule management to systematize inspection procedures. Firstly, the inspection work is defined based on the construction supervision checklist. Then its relationship with the construction process, required time, and resources for inspection tasks are defined in construction schedule. Lastly, a process management program is used to assess the effects of applying the inspection work and examine changes in the overall construction period and process management. The proposed method in this study can support to plan construction inspection more systematically and to improve the effectiveness of construction quality management.

• 한국건설관리학회논문집
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• 제13권3호
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• pp.67-77
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• 2012

프로젝트 초기단계에서 신뢰도 높은 공정계획을 수립하고 공사기간 산정을 정확하게 하는 것은 공사 지연을 예방할 수 있으며, 연속적으로 발생하는 의사결정을 신속하고 정확하게 내리는 데 도움이 된다. 특히 초고층 프로젝트의 경우는 작업이 복잡하고 공사비가 크기 때문에 공사기간을 정확히 예상하는 것이 어렵고 공사지연시 발생하는 손실이 막대하다. 따라서 월별 작업가능률을 정확히 예상하고 적용하는 연구가 매우 중요하며 이는 초고층 프로젝트의 성패와 직결된다고 할 수 있다. 하지만 고도가 높아질수록 기후 환경은 지표면 근처와 차이가 생기기 때문에 일반적인 프로젝트의 작업가능률 산정방법은 초고층 프로젝트에서 정확성이 떨어지게 된다. 따라서 본 연구에서는 작업높이에 따라 변하는 기후요소 변화를 예측하여 이를 적용하여 높이에 따른 작업가능률을 산정하고, 각 지역의 기후특색에 따른 결과를 비교 분석하였다. 산정된 결과에 따르면 작업고도가 높아질수록 부산, 인천, 서울 순으로 작업가능률이 떨어졌으며, 이는 풍속의 영향이 가장 컸다. 이러한 작업높이를 고려한 지역별 작업가능률 산정은 향후 초고층 프로젝트 공사기간 산정업무, 타당성 조사, 대상 지역 선택 등에 활용될 수 있을 것으로 기대된다.

• 한국농공학회지
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• 제14권1호
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• pp.2503-2519
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• 1972

The studies were carried out to find the cause and the quantitative evaluation of sea dike materials loss which is occured during the period of construction works for the tideland reclamation projects on the west coast of Korea. Major subjects to studies were to establish the typical relationships between the tidal flow and the movement of dike materials, the tidal-flow and the erosion, the dike materials and the ratio of material movement(losses), construction methods and the ratio of materials movement (losses). Based on the above subjects, the studies were made for the purpose of obtain the following informations; (1) Collecting and evaluaing the data of dike material losses due to foundation settlement, from designed existing dikes on the west coast. (2) By the field investigation at A-San Sea Dike, Pyong Taek Project, the Comparison would be made by the relationships between the tide velocity and the movement of dike foundation under the natural conditions and the period of construction so that find out the relationship between the dike materials of foundation situation and settlements. With regard to the dike construction works, it is so difficult to calculate the exact quantity of material losses due to the foundation settlements. The major factors that affect the settlement losses of the dike materials are: (1) Topographical variation (2) Swepting the sectional area of dike by the tide velocity. (3) Dumping riprap to the outerside of dike during the period of construction works. (4) Sectional area losses by the cause of occurence of the new tide channels. (5) material losses by the heavy storms. (6) Consolidation settlement by the foundation weakness. (7) Material losses by the earth materials by tide flow. Most hi호 material losses were occured by the Consolidation settlement due to the foundation weakness, the maximum tide velocities due to decrease the cross sectional area of the gaps and erosion of foundation due to the range of tide, Inner and outerside of dike, or dike material loses due to the tide flow. Final conclusion would be obtained by the continuous measurement of consolidation settlement at the stage of final clusure of the dike. (It is scheduled to close on the end of 1972) However, intermediate conclusion can be introduced as follows: (1) The estimation of material(losses) during the period of construction works for the existing sea-dikes up to date were only empirical. The material losses at the general closure for design was estimated at 10% of the riprap, 20% of the earth materials, and 20% of the riprap, 40% of the earth materials at the final closure of the dike. The final closure estimated double quantity to the general closure, but it is still doubt. (2) The ratio of consolidation settlements was found smaller than the calculated quantity. It can be foreseen that settlement speeds is higher thom the calculated speeds. (3) The movement of dike foundation under the natural conditions were not so depends on the geological conditions of the foundation. (4) When the tide velocities was estimated 100 at the normal tide, it was estimated 125 at the high tide and 55 at the low tide. The tide velocities at the low tide shows apparently lower than the high tide and the higher velocities at the deep water depth.

• 한국안전학회지
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• 제36권3호
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• pp.31-39
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• 2021

In Korea, more than half of work-related fatalities have occurred on construction sites. To reduce such occupational accidents, safety inspection by government agencies is essential in construction sites that present a high risk of serious accidents. To address this issue, this study developed risk prediction models of serious accidents in construction sites using five machine learning methods: support vector machine, random forest, XGBoost, LightGBM, and AutoML. To this end, 15 proactive information (e.g., number of stories and period of construction) that are usually available prior to construction were considered and two over-sampling techniques (SMOTE and ADASYN) were used to address the problem of class-imbalanced data. The results showed that all machine learning methods achieved 0.876~0.941 in the F1-score with the adoption of over-sampling techniques. LightGBM with ADASYN yielded the best prediction performance in both the F1-score (0.941) and the area under the ROC curve (0.941). The prediction models revealed four major features: number of stories, period of construction, excavation depth, and height. The prediction models developed in this study can be useful both for government agencies in prioritizing construction sites for safety inspection and for construction companies in establishing pre-construction preventive measures.

• 국제학술발표논문집
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• The 1th International Conference on Construction Engineering and Project Management
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• pp.875-880
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• 2005

This paper represents a partial outcome of a doctoral research undertaken at the University of Tokyo, Japan. The doctoral research looked on the phenomenology of innovation and its implications for the construction industry in Japan. This paper focuses on the perception of innovation by major Japanese construction clients and major Japanese construction firms. Among construction researchers innovation is a popular topic and no conference will miss covering the issue. After a period of very critical judgment on the ability of the construction sector to innovate and partially even frustration on the inflexibility of the sector, a much more positive attitude was taken. At present, most construction researchers would agree that the construction sector clearly is very innovative. That stands in contrast with how construction practitioners perceive their own sector. This paper presents the results of and empirical research in how construction clients and contractors in Japan perceive the issue of innovation. In fact the perceptions differ largely and give interesting insights on particularities of the Japanese construction sector and on the mismatch of clients and contractors perceptions.