• Computational Structural Engineering : An International Journal
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• 제2권1호
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• pp.19-23
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• 2002

A reliability-based cost-benefit model for the risk management of oil platforms in the formulation of optimal decisions based on life-cycle consideration is proposed. The model is based on structural risk assessments and the integration of social issues and economics into the management decision process. Structural risks result from the platform's exposure to the random environmental loading associated with the offshore site where it is located. Several alternative designs of a typical platform are proposed and assessed from the cost-effectiveness viewpoint. This assessment is performed through the generation of cost/benefit relationships that are used, later on, to select the optimal design.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.292-301
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• 2009

The employment of risk management theory in Urban Disaster Management System (UDMS) has become an important trend in recent years. The viewpoint of risk management is mainly a comprehensive risk assessment of various internal and external factors, and a subsequent handling of risks. Through continuous and systematic accumulation and analysis of risk information, disaster prevention and rescue system is established. Taking risk management theory as the foundation, Organization for Economic Cooperation and Development (OECD) has developed a series of UDMS in the mega-cities all over the world. With this system as a common platform, OECD cooperates with different cities to develop disaster prevention and rescue system consisting of vulnerability assessment methods, risk assessment and countermeasures. The paper refers to the urban disaster vulnerability assessment and risk management of OECD and the mega-cities of different advanced and developed countries in the world, and then constructs a preliminarily drafted structure for the vulnerability assessment methods and risk management mechanism in the metropolitan districts of Taiwan.

• International Journal of Naval Architecture and Ocean Engineering
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• 제11권1호
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• pp.353-363
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• 2019

This paper presents a comprehensive simulation and assessment of gas dispersion above sea from a subsea release using a Computational Fluid Dynamics (CFD) approach. A 3D CFD model is established to evaluate the behavior of flammable gas above sea, and a jack-up drilling platform is included to illustrate the effect of flammable gas cloud on surface vessels. The simulations include a matrix of scenarios for different surface release rates, distances between surface gas pool and offshore platform, and wind speeds. Based on the established model, the development process of flammable gas cloud above sea is predicted, and the dangerous area generated on offshore platform is assessed. Additionally, the effect of some critical factors on flammable gas dispersion behavior is analyzed. The simulations produce some useful outputs including the detailed parameters of flammable gas cloud and the dangerous area on offshore platform, which are expected to give an educational reference for conducting a prior risk assessment and contingency planning.

• Coupled systems mechanics
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• 제9권5호
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• pp.433-454
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• 2020

In-place analysis for offshore platforms is essentially required to make proper design for new structures and true assessment for existing structures. The structural integrity of platform components under the maximum and minimum operating loads of environmental conditions is required for risk assessment and inspection plan development. In-place analyses have been executed to check that the structural member with all appurtenances robustness and capability to support the applied loads in either storm condition or operating condition. A nonlinear finite element analysis is adopted for the platform structure above the seabed and the pile-soil interaction to estimate the in-place behavior of a typical fixed offshore platform. The analysis includes interpretation of dynamic design parameters based on the available site-specific data, together with foundation design recommendations for in-place loading conditions. The SACS software is utilized to calculate the natural frequencies of the model and to obtain the response of platform joints according to in-place analysis then the stresses at selected members, as well as their nodal displacements. The directions of environmental loads and water depth variations have important effects on the results of the in-place analysis behavior. The result shows that the in-place analysis is quite crucial for safe design and operation of offshore platform and assessment for existing offshore structures.

• 한국해안·해양공학회논문집
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• 제34권5호
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• pp.135-143
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• 2022

일반적으로 개방된 해안에 위치하고 있는 갯바위, TTP(방파제) 등의 장소는 조수 또는 파랑에 직접 노출되어 있는 위험한 환경임에도 이곳을 찾는 사람들의 잦은 출입으로 안전사고가 빈번하게 발생되는 지역이다. 본 논문은 연안안전사고 예방을 위한 대표적 방안인 위험정보 제공을 위한 위험도평가에 관한 연구로서, 충청남도 태안군 안면읍에 위치한 할미할아비바위(갯바위) 지역을 대상으로 지형형태학적 정보에 기반한 지형적 취약도를 평가하였다. 위험도 매트릭스(Risk Matrix) 기법을 이용하여 16개 방향에 대한 위험도를 평가한 결과, NE, ENE, S, SSW, W 등 경사도가 ±20°를 초과하는 구간이 많이 분포하는 방향에서 지형적 위험도가 높게 평가되었으며, NW 방향은 위험도가 가장 낮은 것으로 평가되었다. 갯바위의 지형형태학적 분석은 일반적인 해안선과 달리 복잡한 지형의 위험요소를 이해하는데 핵심적인 부분으로, 현장 고유의 형태학적 평가인자를 산정할 수 있다. 특히, 현장의 상대적 위험도를 평가하여 위험정보를 제공함으로써 연안활동장소의 부상과 익사 사고의 수를 줄이기 위해 노력하는 해안 관리자들에게 도움이 될 것이다.

• Advances in Computational Design
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• 제2권2호
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• pp.121-131
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• 2017

Collapse was one of the typical common geological hazards during the construction of tunnels. The risk assessment of collapse was an effective way to ensure the safety of tunnels. We established a prediction model of collapse based on Bayesian Network. 76 large or medium collapses in China were analyzed. The variable set and range of the model were determined according to the statistics. A collapse prediction software was developed and its veracity was also evaluated. At last the software was used to predict tunnel collapses. It effectively evaded the disaster. Establishing the platform can be subsequent perfect. The platform can also be applied to the risk assessment of other tunnel engineering.

• 한국안전학회지
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• 제30권3호
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• pp.93-99
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• 2015

Economic burden of work-related musculoskeletal disorder(WMDs) is increasing. Known causes of WMDs include improper posture, repetition, load, and temperature of workplace. Among them, improper postures play an important role. A smart sensor called SensorTag is employed to estimate the trunk postures including flexion-extension, lateral bend, and the trunk rotational speeds. Measuring gravitational acceleration vector in the smart sensor along the tri-orthogonal axes offers an orientation of the object with the smart sensor attached to. The smart sensor is light in weight and has small form factor, making it an ideal wearable sensor for body posture measurement. Measured data from the smart senor is wirelessly transferred for analysis to a smartphone which has enough computing power, data storage and internet-connectivity, removing need for additional hardware for data post-processing. Based on the estimated body postures, WMDs risks can be conviently gauged by using existing WMDs risk assesment methods such as OWAS, RULA, REBA, etc.

• 한국터널지하공간학회 논문집
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• 제22권3호
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• pp.293-310
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• 2020

본 연구에서는 지하철 승강장에서 화재가 발생하는 경우, 제연모드에 따른 위험도를 정량적 위험도 평가기법에 따라서 비교하여 안전확보에 가장 효과적인 제연모드를 제시함을 목적으로 한다. 이를 위해 전형적인 지하철 승장장을 모델로 하여 제연모드별로 대피개시간 및 화재발생열차의 위치에 따른 화재발생 시나리오를 작성하고, 시나리오별로 화재발생률(F)을 산정하고 화재해석과 대피해석을 수행하여 사망자수(N)를 정량적으로 추정하였다. 시나리오별 사고발생률(Frequency)과 사망자수(N:Fatalities)를 추정하여 F/N 선도로 작성하고 이를 사회적 위험도 평가기준과 비교하여 화재 안전성을 평가하였으며, 다음과 같은 결론을 얻었다. 정거장 열차화재 시 인명안전을 위해서는 최대 600 s 이전에 대피가 개시되어야 하며, 정거장 양단배기 시스템이 없는 승강장에서는 승강장 공조시스템을 급기로 운영하여 승강장을 가압하는 것이 대피안전성 확보에 유리한 것으로 나타났다. 승강장 열차화재시나리오에 따른 F/N선도를 작성하여 사회적 위험도 평가기준과 비교한 결과, 제연을 하지 않는 경우에는 한계기준을 상당히 초과하며, 양단배기를 수행하고 승강장을 가압운전모드에서 운영하는 제연모드가 대피안전에 가장 효과적인 것으로 나타났다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2003년도 봄 학술발표회 논문집
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• pp.233-240
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• 2003

A GIS-based tunnelling risk management system (GIS-TURIMS) has been developed in this study The developed system uses ArcView 8.2 as a basic platform and the built-in interface(VBA) has been used to perform first-order simplified analyses for prediction of tunnelling-induced ground movements and building damage assessment. The main emphasis in this study was to develop a working framework that can be used in the perspective of tunnelling risk management. The developed system is capable of carrying out computationally intensive first-order analyses for ground movement prediction as well as building/utilities damage assessment with fully taking advantage of the GIS technologies. This paper describes the concept and details of the GIS-TURIMS development and implementation.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2002년도 가을 학술발표회 논문집
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• pp.311-318
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• 2002

A GIS-based tunnelling risk management system (GIS-TURIMS) has been developed in this study, The developed system uses ArcView 8.2 as a basic platform and the built-in interface (VBA) has been used to perform first-order simplified analyses for prediction of tunnelling-induced ground movements and building damage assessment. The main emphasis in this study was to develop a working framework that can be used in the perspective of tunnelling risk management. The developed system is capable of carrying out computationally intensive analyses for ground movement prediction as well as building/utilities damage assessment with fully taking advantage of the GIS technologies. This paper describes the concept and details of the GIS-TURIMS development and implementation