• Proceedings of the Korean Reliability Society Conference
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• 2002.06a
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• pp.111-111
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• 2002

당사 제품인 건설 중장비용 대형 용접 구조물에 대하여, 설계단계부터 구조해석 및 초도품에 대한 Rig Test, 실차 시험 등 여러 단계를 거쳐 내구성을 평가하고 있다. 그러나 용접품 특성상 수명 평가 및 예측이 용이하지 않아 특히 내구성 개선 또는 효율 증대를 위한 경량화 등의 필요에 따른 설계 변경시 시행착오를 거치는 경우가 많다. 이에 개발 일정의 지연, 시험 비용의 증대 등이 불가피하고, 보증 수명의 증대를 통한시장 확대 등에 있어서도 애로가 있다. 또한 기존 Rig Test의 경우도 실제 사용환경과의 차이 등으로 인해 필드에서의 사용 수명을 예측하는데 한계가 있다. 이에 당 센터에서는 통계적 분석을 통한 사용 조건의 DB 구축과 제품 품질 DB의 구축 및 통합을 통하여 제관품의 특성을 반영한 용접 구조물의 가속 수명 평가법의 신뢰도 향상과 시장 목표에 부합하는 최적 설계 달성을 위한 독자적 Tool을 개발하고 있으며, 이에 대한 첫 번째 과제로 기확보 데이터에 대한 상관관계를 분석하였다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1308-1309
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• 2015

자력발전소 계측제어시스템은 과거의 아날로그 설비에서 디지털설비로 개선되고 있으며, 신규로 건설되는 발전소에서는 모든 시스템이 디지털화 되었다. 디지털설비는 하드웨어와 소프트웨어, 통신기능이 통합된 매우 복잡한 설비이며, 기존 하드웨어를 중심으로한 신뢰도 분석방법으로는 신뢰도를 확인하는데 한계가 있다. 따라서 본 논문에서는 기존의 신뢰도 분석방법의 한계를 극복하기 위하여 신뢰도 검증설비를 구성하여 다양한 시나리오에 의한 장기 종합시험을 수행하는 방식으로 신뢰도를 보증할 수 있는 방법과 구성들을 제시한다.

• Proceedings of the Korean Nuclear Society Conference
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• 1997.10a
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• pp.317-322
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• 1997

앞으로 건설되는 원전의 계측제어계통은 디지털 기술로 설계될 전망이다. 그러나 디지털 기술을 원전 계측제어계통에 적용하는데 있어서 디지털 기술이 원전의 안전성이나 신뢰도에 영향을 미치지 않는다는 사실을 보증하여야 하며, 디지털계통의 기능과 성능에 대한 확인/검증은 원전에 설치되기 전에 수행되어야 한다. 계측제어 시험검증설비의 목적은 새롭게 개발되는 디지털 제어 및 보호 알고리즘, 경보축약 알고리즘 또는 운전지원계통등의 성능을 검증하기 위함이다. 시험검증설비의 소프트웨어는 웨스팅하우스형 993 MWe 가압경수로를 모델링한 수학적 모델링과 시험검증설비를 운용하기 위하여 필요한 종합운용프로그램으로 구성된다. 하드웨어는 공학용 워크스테이션, 시험용 패널, 개발되는 계통과의 인터페이스를 위한 VXI 인터페이스 모듈, 그리고 공유메모리의 값을 시험대상 시작품으로 전송하는 Ethernet 모듈 등으로 구성된다. 사용자 인터페이스로 할덴 원자로 프로젝트에서 개발된 Picasso 그래픽 도구를 이용한 화면과 60개의 주요변수의 값을 CRT에 표시하는 기능을 제공한다. 계측제어 시험검증설비를 응용한 계측제어계통 시작품은 정상운전 및 과도상태에서 적절한 시험결과를 제공하였다.

• Journal of Drive and Control
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• v.15 no.4
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• pp.23-29
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• 2018

The objective of this paper is to evaluate the reliability of a volute pump and presents test results through performance and life tests. The performance and life test methods were presented by analyzing the failure modes of the volute pump. Zero failure test time was calculated to evaluate the reliability of the volute pump and then, the test was performed under accelerated conditions. The test was also carried out to check the failure modes of the field conditions. This study can be provided to improve the product reliability through failure analysis of the volute pump. And failure cause of typical failure case has been investigated and improvement design has been presented. The performance test results of before and after the accelerated life test were presented to confirm the improved reliability of the volute pump.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.12 no.4
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• pp.345-361
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• 2014

The systematic quality assurance activities on documents of the safety assessment are required for the safety case of the low- and intermediate-level radioactive waste disposal facility. In this paper, quality assurance system focused on the input data including the site characterization, groundwater flow, system design and monitoring are prepared and discussed. Rule for the input data selection is suggested and applied for the safety assessment which is based on the in-situ/experiment observations, final facility design and waste pileup plan, engineered barrier, field monitoring, recent biosphere, and radionuclide inventory. The reduction of data uncertainty will be expected to contribute to the safety of disposal facility further.

• Plant Journal
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• v.11 no.1
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• pp.30-38
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• 2015

This study is about whether the new Project Finance scheme called "Asset Backed Short Term Bond(ABSTB)" with Project Finance Guarantee Cover provided by Korean Exim Bank(KEXIM) is an appropriate and valid financing structure, through close examinations on domestic and overseas IPP case studies. This study clearly indicates that (i) the interest rate of ABSTB with KEXIM's Project Finance Guarantee is relatively more competitive than the interest rate of other ABSTB guaranteed by EPC Companies (ii) the lower credit rated EPC companies make higher ROE(Return on Equity) through this financing structure. Lastly, Korean EPC Companies can secure profitability through this innovative financing scheme which will also lead to winning more power plant Contracts and become globally competitive.

• THE INTERNATIONAL COMMERCE & LAW REVIEW
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• v.47
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• pp.129-156
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• 2010

Since the 1970s, international construction employers have commonly requested first demand guarantees upon their contractors as a form of security for due performance of their works. Contractors prefer the greater protection offered by more traditional forms of security requiring presentation of an arbitral award or other evidence of the caller's entitlement to compensation. Many contractors nonetheless feel that they have no alternative but to provide these unconditional guarantees in order to compete. However, these unconditional first demand guarantees are controversial and have given rise to numerous disputes both in arbitration and litigation. Disputes arising from first demand guarantees can be broken down into a) applications to prevent a perceived fraudulent or otherwise unfair or improper calling of a guarantee, b) claims arising from such abusive calls and c) claims relating to the consequences of such calls even if the call itself may not be abusive as such. The contractors should carefully assess the risk of an abusive call being made bearing in mind the difficulties he may face in seeking to prevent such a call. He should also bear in mind the difficulties, delays and cost he is likely to encounter in seeking to recover any monies wrongfully called. One option would be to provide that the call can only be made once and to the extent that the employer's damages have been assessed or even incurred or even for the default to have been established by an arbitral tribunal or court. Another option would be to provide that any call be accompanied by a decision of a competent and impartial third party stating that the contractor is in breach. For example, such a requirement could be incorporated into a construction contract based on the FIDIC Conditions by submitting this decision to a Dispute Adjudication Board. Another option would be to provide for the "ICC Counter-Guarantee Scheme". In sum, there would appear to be room for compromise between the employer and the contractor in respect of first demand guarantees by conditioning the entitlement to call such guarantees to the determination of a competent and impartial third party.

• Korean Journal of Construction Engineering and Management
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• v.13 no.4
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• pp.3-15
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• 2012

Currently, Building Information Modeling (BIM) is an emerging technological shift that involves applying and maintaining an integral digital representation of all building information for different phases of the project life-cycle. Although BIM has been recognized as a main stream in the construction industry, it is difficult to ensure the quality of BIM data due to the problems such as internal errors of BIM tools and lack of guidelines considering design quality. Such problems give lots of difficulties to BIM adoption for designers, constructors, and owners. Therefore, it is necessary to develop the requirements including the object-oriented modeling method and property definition by applying the Industry Foundation Classes (IFC) which is an ISO/PAS 16739 standard for ensuring the quality of BIM data. This research aims at proposing the requirements considering the quality of BIM data and demonstrating the efficiency of the requirements with using the Solibri Model Checker (SMC) which is a quality control tool in a case study.

• THE INTERNATIONAL COMMERCE & LAW REVIEW
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• v.50
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• pp.215-250
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• 2011

Korean won overseas construction projects worth 71.6 billion US Dollars in 2010, which exceeded that of 2009 by 45.6%. An overseas construction project is a transaction of large scale, long term project, many parties participating, deferred payment, and of high-technology. It contributes to foreign currency earning, and also leads the nation's export restructuring work towards high value-added one. There are various kinds of risks towards the relevant parties respectively, which are key elements in successfully performing the overseas construction project. There are completion risk, financing risk, operating risk, revenue risk etc, in an employer's place. A contractor may be confronted with payment risk, issuance risk of performance bond, financing risk, performance risk of sub-contractors, and exchange rate risk. In lenders place there are repayment risk, completion risk, and political risk in the host country. In order to mitigate risks, the parties shall take relevant measures or require relevant securities. A contractor needs to evaluate the credibility of an employer in respect of payment risk, and can also request export insurance cover by the Korea Trade Insurance Corporation(the former 'Korea Export Insurance Corporation"). An employer can require a contractor to provide performance bond in respect of completion risk, and employ a well-known first class bank as a mandated arranger to arrange financing with regard to completion risk. Lenders needs to evaluate the credibility of an employer and accomplish feasibility study of the project. Lenders can request insurance cover from export credit agency. Once the parties assess the respective risks and obtain relevant securities, the project will be successfully completed. The success of the project will be sure to bring the parties involved enormous profits and another opportunity to participate in overseas construction project afterwards.

• Journal of the Korea institute for structural maintenance and inspection
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• v.21 no.3
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• pp.9-18
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• 2017

Construction Management at Risk (CMAR) is a project delivery method that enables CM companies to deliver projects at a Guaranteed Maximum Price (GMP). General contractors can apply CMAR from the initial design phase right through the construction phase to reduce risks and improve project performance. One of the major advantages CMAR offers is that it permits a general contractor to provide a comprehensive suite of preconstruction services, including estimating, a constructability review, value engineering, drawings and a specification review, green building, and Building Information Modeling(BIM), among others. However, general contractors in South Korea currently provide only limited preconstruction services using CMAR because few CMAR projects have yet been implemented in Korea and their experience using the method is therefore limited. This benchmark study of how foreign general contractors utilize CMAR in their projects, particularly during the preconstruction process, its purpose, and the roles and responsibilities of each of the different participants in successful implementations thus provides invaluable information and will serve as a useful guide for Korean contractors seeking to incorporate CMAR preconstruction services in their projects and thus improve the competitiveness of their construction businesses.