• Journal of the Korean Society for Railway
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• v.14 no.1
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• pp.31-38
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• 2011

Turnkey and alternative-design contracts was introduced operation in the country from january 2004 to February 2010. this was introduced operation. The selecting method of contractor for turnkey projects has being operated by an open forum type that consists of technical committee and appraisal committee in an integrated design approach deliberations. But to improve the operation of the problems, the government is operating design review committee consisting of the central, local and special design advisory committee in march 2010. But this system has also been suggested as still problems, too many contracts by large companies, increasing of design cost and excessive competition. This study is intended to contribute that turnkey and alternative-design contracts can be well operated in domestic construction markets. In this paper suggests some improvement methods and operational problems caused from application of an open forum type for selecting contractor of turnkey project.

• Proceedings of the KSR Conference
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• 2006.11b
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• pp.928-934
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• 2006

In this paper, the inductive power collector using electromagnetic induction for vehicle such as the electric railway vehicle system is suggested and some ideas for power collector design to improve the power transfer performance are presented. The inductive power of secondary part is related to amount of linked flux to secondary part by the length of air-gap, which is expected by such a system parameter as mutual inductance. This paper will study for the transfer characteristic of power from input to output and equation including mutual inductance.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.5
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• pp.3587-3595
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• 2015

Low-carbon eco-friendly precast concrete (PC) box structure has been recently was developed as an low-cost infrastructure of near-surface transit system. The concrete of PC box was manufactured by industrial byproducts such as ground granulated blast furnace (GGBF) slag, flyash and rapid-cooling electric arc furnace (EAF) oxidizing slag, its mechanical property and durability were estimated in this study. Based on the mechanical and durability tests, it is found that low-carbon eco-friendly concrete shows high initial compressive strength, more than 90% of design strength (35MPa), and high resistance to salt-attack, chemical- attack and freeze-thaw. Therefore, low-carbon eco-friendly PC box concrete technology is expected to contribute to the railway with low environmental impact.

• Journal of the Korean Society for Railway
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• v.11 no.6
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• pp.562-568
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• 2008

The modern logistics has tried not only to convert the conventional packing system into unit load system using pallet but also to enhance the fitness between packing facilities and transport modes. This is based on the goal to reduce total logistics cost by improving logistics efficiency. Since the packing unit can affect both loading rate and loading facilities, basic form of packing unit is very important to unit load system. The object of this study is to develop a new method for evaluating the effectiveness of standardized packing module. The new method is based on measure of effectiveness (MOE) which are identified by expert survey. This study has originality in that the collecting method for effectiveness of standardized packing module has not been developed up to now.

• Journal of the Korean Geotechnical Society
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• v.25 no.11
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• pp.17-26
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• 2009

The concrete cap, which was established on the top of the micropile, usually considered as an important structural component in micropile supported foundation systems. However, relatively few studies have been made on the load sharing behavior of the capped micropile foundation systems. The primary objective of this study is to assess the load sharing behavior of the capped micropile foundation systems. Therefore, a full-scale test on an instrumented capped micropile is conducted for establishing the load-displacement responses. Nonlinear numerical method was used to quantify the load sharing behavior of the pile cap and micropile respectively. As a result, it was found that the pile cap shares about 50% load from final loading steps in the case of 2 by 1 micropile foundation systems. In the case of 2 by 2, the pile cap shares about 30% load from final loading steps. In addition, the load sharing behavior of the micropile cap becomes larger with an increase in spacing and the battered angle of micropile respectively.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.28 no.4D
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• pp.539-543
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• 2008

The Directional sign system in Korean high speed railway stations has a lot of problems. For an example, It lacks of consistency in the shape or allocation. Also, the signs do not match with the actual directions sometimes. Last but not least, the view is blocked by the other signs such as advertisement or other barriers. We suggested the methods to standardize the sign systems that include visibility, accuracy, consistency, and simplicity. First, we categorized signs into directional signs, locational signs, and infomational signs. Then, we examined the actual high speed railway stations in Korea to learn the real situation. Finally, we suggested the methods to standardize the sign systems considering the factors that are visibility, accuracy, consistency, and simplicity.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.6A
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• pp.587-596
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• 2009

This study analyzes the lateral distribution behavior of external post-tensioning force and evaluates the possibility of strengthening the servicing composite girder bridge by adopting the external post-tensioning force to the parts of the bridge girder. From the results of experiments and analyses, it is founded that the composite girder bridge can be strengthened by applying the external post-tensioning force to the parts of the bridge girder. It is also proved that bracing improve the lateral distribution behavior of post-tensioning force. The lateral distribution behavior of post-tensioning force which influenced by stiffness ratio, girder spacing and span length is changed by the bridge type and the location of tensioned girder. From the results of analyses, set up an equation which can predict the lateral distribution behavior of external post-tensioning force and evaluate the rationality.

• Proceedings of the KIPE Conference
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• 2013.11a
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• pp.237-238
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• 2013

이중화는 전력 전송 시스템, 발전 시스템, 철도 제어 시스템 등 많은 자동화 시스템에서 유지 보수 및 안정도 증진을 위해 사용된다. 그러나, 이중화 개념을 도입할 경우 각 제어기나 통신 라인 측정시스템 등 모든 구성요소들이 2배로 사용되게 되어 시스템 구축 비용이 증가하고 이중화 제어를 위한 알고리즘 및 COL(Change Over Logic)과 같은 이중화 제어용 모듈 등을 추가해야 하는 추가적인 부담도 발생된다. 하지만, 시스템을 이중화할 경우 전체 시스템의 안정도가 어느 정도 개선되는지에 대한 연구는 미미하며, 그럼에도 불구하고 각 산업 전반에서 다양한 구조의 이중화를 체택하고 있다. 따라서 본 논문에서는 확률을 기반으로 시스템 이중화가 전체 시스템 안정도에 어떤 영향을 미치는지 분석하였다.

• 월간 기계설비
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• no.9 s.194
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• pp.64-70
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• 2006

세계 100대 건설사 중 하나인 쌍용건설(주)는 1977년 창립 이래 오늘날 까지 꾸준한 성장을 보이고 있다. 해외건설 시장이 중동에 편중되었던 80년대에는 싱가포르, 말레이시아, 미국, 일본 등 해외시장 개척의 첨병 역할을 톡톡히 했으며, 인천국제공항, 경부고속철도, 경의선 등의 대규모 국책사업을 성공적으로 수행했고 더불어 고속도로, 항만, 플랜트 등을 시공하여 국가 산업 발전에도 기여하였다. 2005년 1조 1천600억 원대의 매출액과 300억 원대의 경상이익, 1조 9천억 원대의 수주를 달성하는 성과를 올린 쌍용건설(주)는 2006년의 경영 목표를 턴키 및 SOC민자사업 확대/ 지방 및 수도권 신도시 위주의 주택사업 전개/ 동남아 국가 사회기반시설공사 적극 참여 및 고급 건축분야 수주 확대 등으로 삼아 이를 이루고자 전력을 다하고 있으며, 이런 노력의 결과로 지난 7월, 인도네시아에서 미화 1억 3천만 달러 규모의 '플라자 인도네시아 확장공사'를 수주하여 건설업계의 화제가 되기도 했다.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2004.11a
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• pp.105-109
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• 2004

우리나라 지형의 특성은 약 70%가 산으로 이루어져 있다. 이러한 지형적 여건은 교통과 관련된 사회간접 자본의 증가로 이어지며, 최근에는 산업의 발전에 힘입어 교통량의 증가와 물류비용의 절감을 목적으로 철도 및 도로의 건설시 터널의 계획 및 시공이 증가되고 있는 추세이다. 이에 따라 터널의 환경개선과 화재시 제연을 목적으로 설치되는 제트팬(Jet Fan)의 용량이 차지하는 전기적 비중이 높아지고, 전압강하에 대한 손실율이 증가되고 있다. 따라서 제트팬의 설치시 배치방법과 터널의 길이에 따른 전기실 배치를 Case 별로 분류하여 전압강하를 계산하고 분석하여 가장 효율적이며 경제적인 방안을 연구하고 정리하여 향후 설계시 기초자료를 제공하고자 하였다.