• KSCE Journal of Civil and Environmental Engineering Research
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• v.30 no.3D
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• pp.295-302
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• 2010

Since the late 1990s, the BOT mode in China has been extensively used in the water sector in order to attract private investment, improve technical and operational efficiency, and expand the coverage of water services. The BOT mode has been hailed as this provides a win-win structure between the government and private players through formalized procedures and an optimal risk allocation. However, recent market analyses show that some foreign investors are reluctant to participate in the market or even retreat due to uncertainties and risks in the market. This study aims to explore various risks in the Chinese water BOT market based on the thorough literature review, fieldwork, and the case studies on the two wholly foreign-owned BOT water projects: the Chengdu No. 6 and the Shanghai Dachang Water Supply BOT projects. The research results indicate that the Chinese BOT market embraces high risks in political, institutional and legal, and financial systems. The key to a successful takeoff of the BOT mode in the Chinese water market depends on the extent to which the government will be able to remove risky factors in political, institutional and legal, and financing systems. This research outcome will provide a useful reference to the Korean construction companies which consider expanding business to overseas water markets in the form of public private partnership.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2008.11a
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• pp.119-128
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• 2008

Recently, because of the economic slump on the national construction market, enterprises are making a ceaseless effort on participating in the competitiveness enforcement, internationalization and globalization. As this firm has found a larger market abroad and took part in great and small services since 2003, successful services are going under construction in USA, Mongolia and Guam. In this case study, looking around the on-going projects, the analysis and solutions of the differences of the counter attitude and matters resulted from politic, economical, social and cultural gaps are proposed. This study is helpful to enterprises which are planning to extend its business abroad and which want to take part in global standards.

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.339-339
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• 2017

손상함수란 건물, 차량, 농작물 등과 같은 피해대상물에 재난강도에 따른 취약도(vulnerability)를 정량화한 함수로, 재난리스크 모델에서 널리 사용되는 개념이다. 홍수재난에서 손상함수는 일반적으로 피해지역에서 조사된 경험적 피해자료(empirical data)를 활용하거나, 표준화된 피해대상물에 대한 손상성을 전문가의 의견(expert opinion)을 참고하여 개발된다. 이때, 취약도를 설명하는 설명변수는 일반적으로 침수심(inundation depth)이 사용되며, 그에 따른 취약도는 손상률(percent damage)로서 상대함수 형태가 일반적이다. 본 연구는 주거건물(residential building)에 대한 손상함수 개발을 위해 자연재난 손해사정 경력자(8인)를 대상으로 표준화된 주거건물(단독주택, 아파트, 연립/다세대주택)에 대해 침수에 따른 건물 손상성을 조사하였다. 주거건물 손상성을 설명하는 최대범위는 건물내부 바닥고를 기준으로 침수심 3m까지이며, 침수심 변화에 따른 손상성을 건물신축 공종에 따라 질의하고 이를 종합하였다. 조사과정은 (1) 표준건물에 대한 정의, (2) 공종별 침수에 따른 손상여부 질의, (3) 공종별 최대 손상률 평가 및 주요 피해내역 토의, (4) 공종별 침수심에 따른 손상률 평가, (5) 결과종합의 단계로 진행되었고, 이를 통해 주거건물 유형에 따른 손상함수를 개발할 수 있었다. 본 연구에서 개발된 손상함수는 다양한 침수높이에서 주거건물에 대한 취약도를 설명하는 데 장점이 있으나, 그 결과는 향후 홍수피해지역을 대상으로 수집된 다양한 피해조사 결과와 비교하여 보완될 필요가 있다.

• Proceedings of the Korea Water Resources Association Conference
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• 2019.05a
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• pp.186-186
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• 2019

국내에서 자연재난의 대부분을 차지하는 홍수는 매년 반복되어 인명과 재산상의 막대한 손실을 유발하고 있다. 이러한 피해 중 인적피해를 최소화하기 위한 방재계획 및 정책수립이 우선되어야 하지만 적용성 측면에서 미진한 부분이 있는 것이 현실이다. 본 연구는 인적피해 평가를 지원하기 위해 피해실적에 근거한 경험적 인적피해 평가기법을 개발하였다. 또한, 해당기법의 적용성을 평가하기 위해 2017년 청주시 호우피해를 기준으로 적용성 검증을 실시하였다. 인적피해의 경우 인명과 이재민 피해를 동시에 고려하였으며, 인적피해를 위해 기본적으로 노출위험인구와 인적피해 발생확률을 기반으로 하였다. 노출위험인구의 경우 침수구역도와 집계구를 기준으로 계층화된 인구 인벤토리를 이용한 GIS 공간분석 결과로부터 결정된다. 그리고 인적피해 발생확률은 행정안전부의 국가재난관리시스템 내 피해이력, 재해연보 및 한국국토정보공사에서 제공받은 침수흔 적도를 토대로 침수등급과 인구계층을 구분하여 제시하였다. 본 연구를 통해 제시된 보다 효율적이고 정밀한 인적피해 평가 방법이 위험지구 결정, 자연재난 리스크 모델링, 방재사업 대안결정, 예산배분 등의 실무와 학술적 접근에 있어 활발히 활용되길 기대한다.

• Korean Journal of Construction Engineering and Management
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• v.13 no.6
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• pp.107-120
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• 2012

This study is conducted so as to understand actual condition of financial difficulties confronted by construction companies in the recession of real estate market which has been continued since the financial crisis started from USA in the second half of 2008, and provide fundamental data for the establishment of policy direction. Compared with this actual condition survey with a 2008 investigation, it seems that the practice of financial institutions or credit evaluation relating parts among sections, which were pointed as problems in such investigation, are resolved to some extent. It seems that there are many causes to aggravate financial conditions as pointed at this time and such causes are related to self-problems, which are inherent to the construction business, such as the smooth settlement of construction payment, the securement of new construction projects, the limitation according to the risk inherent to the construction business, and the industry vision, etc.

• Korean Journal of Construction Engineering and Management
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• v.12 no.6
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• pp.120-129
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• 2011

An installation of the construction lift has a few limitations by many constrains and these have influences on labor productivity, that can be changed by vertical-transportation management. In the super-tall building construction, a management of construction lift operation is one of the most important factor, but existing methodologies depend on skilled practitioners' experiences. And it is true that the expertise resulted by the experiences does not transfer to the next generation. This study is a part of lifting-management simulation development which aims at the optimal construction lift management. A proposed algorithm is focus on lifting time calculation considering an acceleration capability. This research evaluates the result accuracy using comparative analysis on simulation result and field measuring time.

• Korean Journal of Construction Engineering and Management
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• v.10 no.6
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• pp.117-126
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• 2009

Many work-related risk factors can cause construction site hazards. Considering variable and changeable characteristics of construction site, risk of same trade can be different by combination of inherent characteristics. But established safety management has performed like other industries not reflecting characteristics of construction. So, to suggest risk assessment methodology considering risk influence factors in construction site, this study extracts risk influence factors by literature reviews and surveys, builds the weighting system for classification of factors. And risk of trade is calculated based on frequency and severity of risk. Risk assessment methodology is suggested by integrating risk influence factors and risk of trade. From this, risk considering the conditions of construction sites can be derived and based on the derived risk, safety management can be performed more effectively. This study has meaning for assessing the risk which can reflect characteristics of construction site considering risk influence factors.

• Korean Journal of Construction Engineering and Management
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• v.15 no.5
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• pp.138-146
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• 2014

Modular construction is one of the arising issues in the Korean construction industry due to shorter construction period and higher productivity on site. It is also expected that modular construction market would expand rapidly because of increasing demand of small houses by nuclear families and eco-friendly construction. However modular construction cases have been limited in Korea because of little demand in the market and the construction prices are even higher that the regular reinforced concrete methods. Even worse, because there is no standard bill of services exists in the industry, it may lead to the risk of construction expenses. So, the purpose of this study is focused on the development of bill of services which reflects characteristics and process of modular construction. In order to do this, the concepts and process of modular construction, WBS and CBS are analyzed. Analyses of the case studies and experts interview were executed so that proper principles for organizing bill of service of modular construction is established. Finally according to the 3 steps of modular construction, factory manufacturing, on-site modular construction and on-site general construction, the standard bill of services were suggested with the related coding system.

• Journal of Korean Tunnelling and Underground Space Association
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• v.19 no.6
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• pp.973-984
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• 2017

There is a growing need to apply TBM tunnelling method for the construction of underground facilities such as subways and utility tunnels in urban areas. Due to the variability and uncertainty of the ground, tunnelling in urban areas has various safety hazards which could cause damage to people and properties and it is very costly to recover from accidents. Therefore, it is very important to identify hazards from the planning and design phase and to establish risk mitigation measures. In this study, a total of 31 hazards affecting the stability of TBM tunnelling works in urban areas were listed from both the technical literature and correspondence with experts in tunnelling area. The importance and priorities of the hazards were analyzed by conducting Delphi technique, which is a decision-making method by consensus among experts. Finally, 12 hazards that satisfy the content validity criteria were settled and could be used as major control factors for accident prevention during TBM tunnelling works.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.34 no.5
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• pp.319-325
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• 2021

The 2011 East Japan Earthquake caused accidents at a number of nuclear power plants in Fukushima, highlighting the need for a study on the seismic safety of multiple NPP (Nuclear Power Plant) units. In the case of nuclear power plants built on a site that shows a similar seismic response, there is at least a correlation between the seismic damage of structures, systems, and components (SSCs) of nuclear power plants. In this study, a probabilistic seismic safety assessment was performed for the loss of essential power events of twin units. To derive an appropriate seismic damage correlation coefficient, a probabilistic seismic response analysis was performed. Using the external event mensuration system program, we analyzed the seismic fragility and seismic risk by composing a failure tree of multiple loss of essential power events. Additionally, a comparative analysis was performed considering the seismic damage correlation between SSCs as completely independent and completely dependent.