• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2008.11a
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• pp.905-908
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• 2008

The BTL project, 4 years since its operation, has benchmarked the PFI Project in Japan and has been introduced. Given the evaluation step to select a preferred bidder, in a technological factor, the basic plans are corrected and complemented, whereas in a price factor, the low price bidding system is being enforced. There is concern that how to select preferred bidders and how to operate project costs during operation and management period may be problematic. Thus, in this study, using the Analytic Hierarchy Process, the method of deciding the pribrity to select preferred bidders in an early stage of the project and the evaluation model to evaluate the validity of BTL project expenses in process of project enforcement are established. Targeting the group. composed of experts who have experiences in the BTL project. Then, the levelling of evaluation factors and grouping have been carried out as following: LCC analysis and disbursement for government including two more detailed factors.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.21 no.6
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• pp.55-64
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• 2007

This paper represents characteristics and design example of series loaded LCC type high frequency resonant DC-DC converter with variable parallel capacitor in the secondary side of inductive power transformer. In this converter, ZVS(zero voltage switching) technique is applied to reduce turn-off switching losses, and the applied converter used the PFM switching pattern to control output voltage. The operating characteristics of the proposed converter is analyzed using nomalized parameter such as switching frequency and load factor with varing the secondary parallel resonant capacitor. The results of analysis show the operating characteristics and design method of the proposed converter using characteristic values. And the proposed converter can be applied for the contactless power supply with linear transfer system such as dean room facilities of semiconductor and Flat Panel Display.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2007.11a
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• pp.446-449
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• 2007

For the restoration of construction industry, the government have offered the policy since the end of 1990. It has offered to develop the world-class technology and establish the effective production structure. In the government policy, the delivery and contracting method has improved so that construction industry could be recognized. Foreign countries have conducted the R&D and application of Innovative Contracting for improvement of facilities, reduction of LCC and innovation of contractor. Among the Innovative Contracting, 'Performance Warranty Contracting' is defined that A guarantee of the integrity of a product and of the makers responsibility for the replacement or repair of deficiencies. Performance Warranty Contracting is used for technology developments of contractor, improvement of quality, reduction of LCC, prevention of early deficiencies and reduction of owner's inspection works. This paper analyzes concept and effects of Performance Warranty Contracting and presents considerations according to the introduction.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2005.05a
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• pp.13-16
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• 2005

Generally, as corrosive protection processing of a steel structure, zinc galvanizing and heavy duty coating paint are applied. However, zinc galvanizing has the difficulty of restriction of a size, or on-site construction. Moreover, heavy duty coating paint has a problem with many administrative and maintenance expenses with short problem of adhesion, corrosion generating of a damage portion, and maintenance management cycle. In this study, a salt water spray test, CASS test, and the electrochemistry examination were carried out for the thermal metal spray method of construction for corrosive protection performance evaluation. Moreover, the corrosive protection life of a thermal metal spray method of construction was quantitatively calculated on the basis of this experiment. in consideration of LCC, the economical efficiency of a general corrosive protection method of construction and a thermal metal corrosive protection method of construction was compared. Consequently, although initial construction expense was estimated 16 to $30\%$ high, as for a thermal metal spray method of construction, it turns out that the administrative and maintenance expenses for 100 years became cheap 9.3 to 13 or more times.

• Journal of the Architectural Institute of Korea Structure & Construction
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• v.36 no.1
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• pp.147-154
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• 2020

The exterior finishing of reinforced concrete buildings is one of the important factors to prevent durability and prevent natural environment or disaster such as temperature, snow, wind, rain from the outside as well as external design of buildings. Finishing methods can be divided into wet and dry methods. The wet method using paint is relatively easy to construct, but it requires repair and reinforcement every 1 to 5 years and requires a lot of LCC for maintenance. Finishing method using panel has good durability, but it is difficult to install and expensive. Therefore, in this paper, we evaluate the bond strength for the application of the metal spray method in order to overcome the problems of existing methods. Experimental results show that the sandblast + surface roughness agent(S-R(Y)) has a roughness of 41.16 ㎛ and the bond strength is about 3.19 MPa, which is the highest bond strength. In addition, the grinding + surface roughness agent(G-R(Y)) application showed roughness of about 36.59 ㎛ and secured the bond strength performance of 2.94 MPa.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2009.10a
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• pp.387-390
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• 2009

앞으로 국제경쟁력 확보를 위해서는 성능중심의 건설기술기준 적용이 필요하다. 성능중심의 건설기준을 개발하고, 성능계약제도 도입방안을 구축함으로써 시설물의 성능을 향상시키고, 생애주기비용 (LCC)을 절감하며, 설계 및 시공자의 기술개발을 유도하는 것이 필요하다. 본 연구에서는 건축전기설비분야를 중심으로 에너지절약 요소기술을 발굴하고, 설계기준에 기술하기 곤란한 사항, 기술자가 효율적인 업무수행을 위하여 필요한 사항들을 도출하여 실무에 쉽게 활용하도록 설계편람을 작성하는데 있다.

• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 2005.03a
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• pp.388-395
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• 2005

This paper presents cost-effectiveness evaluation of semi-active control system for cable-stayed bridge under earthquake excitation. Bi-state control method with Linear Quadratic Gaussian(LQG) optimal controller is used for generic semi-active dampers. Cost-effectiveness of the structural control system is investigated by using the life-cycle cost(LCC) concept. The evaluation results show that the efficiency of semi-active control system is increased when the damage cost due to the failure of bridge system or the bridge importance is enlarged. It was also found that the damper cost had little influence on the cost-effectiveness of semi-active control system if it was relatively small to the initial construction cost.

• Journal of Korea Society of Industrial Information Systems
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• v.20 no.5
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• pp.107-115
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• 2015

Residential building owners are turning toward renovating their existing buildings to improve old and inefficient HVAC systems. Due to the renovation, much of the added costs will inevitably be passed on to tenants by increasing rent rates. This increment often increases the vacancy rate in the buildings. To balance the interests of both owners and tenants, this paper suggested a method to determine an appropriate rental rate increment for the HVAC system renovation. A case study on residential buildings was conducted to determine a balanced point where the rental rate increment that offsets the amount tenants are willing to pay for the renovation. To calculate all costs incurred by the renovation, life-cycle cost analysis was carried out. Therefore, this paper ultimately provides a threshold value of rental rate increment such that building owners can make a reasonable decision on the HVAC system renovation.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.18 no.34
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• pp.83-89
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• 1995

We call as plant life cycle the process starting from plant plan, design to disuse by way of construction, operation, but the plant facility inside it comes to changes of cope with various inner factor like blazing phenomenon and outer factor according to economic state. On the presumption of these factors, the problem is brought about how plant should be managed, this study attempt to suggest the conservation management through economic evaluation in investment design and alternative, that is, methodology connecting that of economical efficiency evaluation based on LCC(Life Cycle Costing) thinking method and facility management with that of life prediction.

• Journal of Industrial Technology
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• v.23 no.A
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• pp.35-39
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• 2003

There are many kinds of electronic ballast for various kinks of fluorescent lamps. The PFC(Power Factor Correction) circuit in electronic ballast is classified in two types. One is the active PFC and the other is the passive PFC circuit. The active type PFC is higher than the passive type, but the cost of the passive type is cheaper than the active type. In this study, we introduced the modified passive PFC method which is called semi-boost PFC, and then we analyzed and experimented the electronic ballast which is composed of the semi-boost PFC, half-bridge, and LCC resonant tank. Experimental results showed that the $$PF{\geq_-}0.98$$, $$CF{\leq_-}1.4$$ and input current $THD{\approx}15%$.