• KSCE Journal of Civil and Environmental Engineering Research
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• v.26 no.5D
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• pp.849-859
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• 2006

Earnings of domestic enterprises are expected a serious damage because the lowest cost bid system and the current cost estimate system. In 2005 average successful bid rate for the lowest cost bid project is below 60%, this is not reach at the operating budget of enterprise. Many problems such as illegal construction, low price subcontract, chain enterprise loss com in to practice because of low successful bid rate. In addition earnings of the enterprises expected to be the minimum, because of enlarge execution of the current cost estimate system. This study tries to lend assistance by giving alternative for the construction enterprise by presenting the bid system, investigate and compare foreign system with domestic and analyze correlation of the lowest cost bid and the current cost estimate system.

• Journal of Bio-Environment Control
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• v.30 no.4
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• pp.367-376
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• 2021

Strawberry cultivation in Korea is grown in greenhouse, but most farms manage their water supply using a timer control method based on the experience of growers. The timer control has problems in that it is difficult to consider the weather condition, the growth stage of crops, and the moisture content of the substrate, so that the crops cannot be managed at an optimal level, and the accuracy of cultivation management are lacking. The watering methods using integrated solar irradiance and substrate moisture contents are control systems that provide eco-friendly and precise water supply considering the growth conditions of crops. The purpose of this study was to compare the combined water supply control with integrated solar irradiance and substrate moisture contents and timer control method in hydroponic cultivation of strawberries using coir, and to set the optimal integrated solar irradiance level for complex water supply control. The irrigation system was automatically watered when it reached 100, 150, 250 J·cm^-2 based on the external solar irradiance, and forced irrigation was performed at a substrate moisture content of less than 60% in all treatments. The amount of irrigation at once was 50 mL. The timer treatment was applied as a control. The smaller the level of integrated radiation to start watering, the greater the daily amount of irrigation. Both the fresh weight and dry weight per plant were higher in the complex irrigation control method than the timer control, and the 100 and 150 J·cm^-2 treatment had the highest fresh weight, and the 100 J·cm^-2 treatment showed a significantly higher dry weight. The yield was also significantly higher in the complex control method than in the timer, and the early yield increased as the level of integrated solar irradiance was smaller. The fresh weight of fruit was the lowest in the timer-controlled irrigation. As a result of this study, the possibility of combined control irrigation method using integrated solar irradiance and substrate moisture content was confirmed for precise water supply management of strawberries in hydroponics.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.2120-2121
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• 2011

현재 정부가 추진하고 있는 전기분야 실적공사비 적산제도와 관련된 최근의 움직임은 당초의 취지와 달리 실적공사비에 대한 개념 부족과 임의적 해석 등으로 실적공사비 적산제도 도입의 바람직한 방향성에도 불구하고, 실적단가 축적의 기초 자료인 계약내역서의 직접 공사비 낙찰률 적용 관계 등 실적단가의 적정성에 대한에 근본적인 접근보다 예산절감, 물가안정 측면으로 접근하여 시장단가 반영에 대한 왜곡현상이 발생 할 수 있는 제도상의 문제점으로 실적단가 축적에 대한 적정성 판단에 따른 실적단가의 보정 수단이 미약하여, 현행 법제도 하에서 실적단가의 적정성 확보를 위한 대응 방안을 제시하여 실적공사비를 정착시킬 필요가 있다. 왜냐하면 품셈에 의한 문제점 등으로 실적공사비 적산제도로 공공 건설공사의 예정가격산정 방식을 전환 하였다고 볼 때, 본 제도의 실패는 또 다른 제도로의 전환 또는 보완이 필요하다고 판단된다.

• Korean Journal of Construction Engineering and Management
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• v.4 no.1 s.13
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• pp.114-121
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• 2003

The precise quantity of materials is not yet taken off by the CAD system although it has Influenced in design productivity and automatic estimate. And various estimate systems developed so far deal with the quantity take-off of building members separately, which caused to over-estimate the part of each member. Therefore, the purpose of this paper is to develop algorithms of more precise estimate than that of current estimate by solving boundary conditions of the connection parts of building members, such as column, girder, beam, wall and slab. The algorithms are proposed to take off the quantity of concrete and form work and they will be used for the estimate of building structure more precisely and automatically than ever.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.3
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• pp.1474-1480
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• 2013

This study attempted to estimate construction costs in accordance with the resource-based cost estimation (unit cost price) system by diameter for TBM method, and analyzed the direct cost and the total cost. Based on such figures, this study performed a regression analysis and proposed a model for an equation for estimating construction costs. model for the resource-based cost estimation (unit cost price) system classified by diameter for TBM method proposed by this study can be effectively applied to business planning, preliminary investigation, feasibility study, construction cost estimations in the early design stages.

• Journal of the Korea Institute of Building Construction
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• v.5 no.3 s.17
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• pp.58-62
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• 2005

• Journal of the Korea Institute of Building Construction
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• v.5 no.3 s.17
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• pp.52-57
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• 2005

• Journal of the Korea Institute of Building Construction
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• v.1 no.2
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• pp.96-100
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• 2001

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1998.06a
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• pp.1281-1284
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• 1998

• 공원문화
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• s.29
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• pp.47-51
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• 1985