• Korean Journal of Construction Engineering and Management
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• v.13 no.2
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• pp.102-109
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• 2012

One of key success factors in PPI(Public Private Investment) is the structure of risk sharing between the public and the private, and the determination mechanism of fair return to private participants relative to the risk that private participants undertake. In Korea, two basic types of PPI exist. One is BTO and the other is BTL. In BTO, most risks are taken by the private whereas the opposite is the case in BTL. No intermediate form exists. As a result, BTO type projects had difficulty in attracting private participants because of the excessive risks. In this study, one intermediate form is studied where demand risk is shared between the public and the private. In the setting where the public authority takes all the project revenues and then pays ladder type payments to private participants depending upon the level of project revenues, appropriate level of fixed payments is endogenously derived using the real option pricing model. From the fixed payments, expected investment returns are calculated based upon a certain distributional assumption. The results of this study is expected to help introducing diverse forms of PPI in Korea.

• Journal of Korea Multimedia Society
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• v.16 no.4
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• pp.418-429
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• 2013

This paper presents a GIS vector map data compression scheme based on hybrid polyline simplification method and SEC(spatial energy compaction). The proposed method extracts all layers which contain polylines in the GIS vector map and compress all polylines in extracted layers by the hybrid polyline simplification and SEC based on MAE(minimum area error) for each segment in the line. The proposed simplification and SEC increase the compression ratio while preserving the shape quality. We analyze the visual aspects and compression efficiency between the original GIS vector map and the compressed map. From experimental results, we verify that our method has the higher compression efficiency and visual quality than conventional methods.

• Explosives and Blasting
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• v.22 no.3
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• pp.43-55
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• 2004

Use term of tower style construction exceeds recently. Accordingly, according to construction safety diagnosis result, achieve removal or Improvement construction. But when work removal, must shorten shut down time. Therefore, removal method of construction to use blasting demolition of construction is very profitable. Influence construction and equipment by blasting vibration and occurrence vibration caused by felling impact. Is using disadvantageous machine removal method of construction by and economic performance by effect of such vibartion. Therefore, this research studied techniques to forecast vibartion level happened at blasting demolition and vibration reduction techniques by use a scaled model test.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.10
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• pp.2907-2916
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• 2009

PPPs(Public Private Partnerships) in Korea was introduced in 1990s, which mainly used for providing transportation facilities such as railroad and high-way. Since 2005, a service delivery type PPPs, in other words BTL(Build Transfer Lease) has been implemented, which focused on social infra-structure including school, military housing, and sewage facilities. According to previous literature, efficient risk evaluation and management is the key factor for successful PPPs in the UK and Australia. However, Korea doesn't have proper risk evaluation system for PPP type project. In this paper, we explore and analyze risk evaluation system of PPPs in Korea and other countries. Also, we apply empirical methodology used in the UK to a BTL project and set up a new PSC(Public Sector Comparator) with risk evaluation.

• Journal of the Korean Institute of Rural Architecture
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• v.18 no.1
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• pp.11-18
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• 2016

The purpose of this study is to analyze the characteristics for the needs of rural residents and return farmer on rural rental housing. Through these rural rental housing as it wants to improve the living environment of rural areas. Housing problems of rural areas is one of the important factors that determine the quality of life in rural areas. Despite many rural development program it has been deteriorating housing conditions in rural areas. The purpose of this study aims to find the required characteristics of the rural residents and return farmer for rental housing system introduced in rural areas. As research methods, the survey it was required to rent the properties rural residents and expectant return farmer. The main analysis results are summarized as follows. First, expectant return farmer than rural residents are more flavors of rental Residential high. Second, rural residents prefer ratio was higher this apartment, expectant return farmer appeared to prefer the house. Finally, rural residents may prefer concrete homes, expectant return farmer appeared to favor the wooden houses. The results of this study can be a basis for effective strategies for future rural rental housing. More sustainable in the future, including the analysis of various parameters in progress by being linked to policy measures that will be provided. This study aims to be the foundation of sustainability in rural rental housing policy.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2006.11a
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• pp.278-283
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• 2006

Koran Government introduced BTL(Build-Transfer-Lease) to provide convenience through early supplying infrastructure and plans to invest 8,315million dollar to 84 projects of 15 BTL type involving official residence and railroad. But some of construction company hates to invest BTL projects because of its low earning rate. In addition if we correctively apply project which partly has profitability to BTL, the earnning rate declines more seriously. So this paper presents BTL+BTO model which operates BTL in the non-profitable parts to improve convenience of users and BTO in the profitable parts to improve earning rate. BTL+BTO model based on operate period was presented and its suitability was confirmed by applting 00 region official residence project.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2006.11a
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• pp.686-691
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• 2006

Beginning January 2005, the BTL (Build-Transfer-Lease) project was initiated by government to provide high level of public services for the upgraded quality of life. The most important process of the BTL project is operation, because the company have to operate the building about $20{\sim}30$ years after completion. But a lot of problems have been founded so far. For example, no counterplan for the risk in operation, no total control system and the vagueness in project guideline and so on. These problems will cause serious demage to the BTL project. Hence, this paper analyzes the above issues and conducts the interviews with the professionals from the diverse sectors in order to propose the improvement and deliver the successful operation in BTL project.

• Journal of Korean Society of Water and Wastewater
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• v.34 no.3
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• pp.191-200
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• 2020

This study is to improve the efficiency of BTL (Build Transfer Lease) project operation by comparing the infiltration rate based on the data of 5 years of infiltration of the separate sewer system and combined sewer system. In the survey site, the separate sewer system area consists of eight flowmeters in seven treatment basins, and the combined sewer system area consists of eight flowmeters in five treatment basins. The infillration rate was analyzed by night-time domestic flow evaluation method, and the average infiltration rates of the separate sewer system and combined sewer system were 13% and 16%, respectively. Combined sewer system was about 1.3 times higher than the separate sewer system. The average BOD of separate sewer system was 233 mg/L, which was about 2.4 times higher than the combined sewer system was 107 mg/L. In the comparison of the average pipe diameter-length infiltration of separate sewer system and combined sewer system, the separate sewer system and the combined sewer system were about 0.150 ㎥/d/mm/km and about 0.109 ㎥/d/mm/km, respectively. The floating population in mixed residential and commercial areas has been identified as the cause. Therefore, we propose a method to calculate the infiltration rate in consideration of the margin ratio in the area where the night active population is concentrated.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.4
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• pp.2807-2817
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• 2015

The purpose of this study is to draw out implications and directions for improvements on national public rental housing policy by examining SF's public rental housing policy and conditions for low income households, and analyzing 'multilateral considerations for residents and communities' and 'concrete case and policy for support' which are discovered in process of re-development of large-scale public housing revitalization. The results were as follows: First of all, HOPE SF ensures to involve resident as participant in entire project considering exist communities and resettlement of resident. Secondly, HOPE SF supported to enhance the lives of existing residents and their community through integrated support system. Thirdly, HOPE SF collaborated with various participants as partner of city's rehabilitation, thus, invite community opinion to build a sense of cohesion. And for last, HOPE SF tried to create a new financial model for sustainable and practicable rehabilitation.

• Korean Journal of Construction Engineering and Management
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• v.8 no.5
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• pp.92-100
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• 2007

PFI(Private Finance Initiative) Project is carried to expand infrastructure effectively through participation of private investment. From the year 2005, the range is expanded not only industrial infrastructure such as made road, harbors and so on but living infrastructure such as school facilities, environmental facilities. For this reason BTL(Build-Transfer-Lease) system is mainly used in new private finance initiative project but in existing private finance initiative project BTO(Build-Transfer-Operate) system was used. BTL system is operated to judge fitness of private investment and classified into quantitative VFM(Value for Money) and qualitative VFM. In this research the estimation item of qualitative VFM which is hard to deduce the effect is created and after surveying of questionnaire in target of experts, relative importance and weight is established with AHP(Analytic Hierarchy Process). By estimating efficiency and benefit of quantitative VFM and qualitative VFM aspect effectively it is expected to support a rational making decision for operating BTL.