• Title/Summary/Keyword: System Safety Assessment

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Method for simultaneous analysis of bisphenols and phthalates in corn oil via liquid chromatography-tandem mass spectrometry

  • Min-Chul Shin;Hee-Jin Jeong;Seoung-Min Lee;Jong-Su Seo;Jong-Hwan Kim
    • Analytical Science and Technology
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    • v.37 no.5
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    • pp.271-279
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    • 2024
  • Bisphenols and phthalates are endocrine-disrupting chemicals that are commonly used in packaging and as plasticizers. However, they pose health risks through ingestion, inhalation, and dermal contact. Accurate analysis of these pollutants is challenging owing to their low concentration and their presence in complex oil matrices. Therefore, they require efficient extraction and detection methods. In this study, an analytical method for the simultaneous quantification of bisphenols and phthalates in corn oil is developed. The dynamic multiple reaction monitoring mode of liquid chromatography-tandem mass spectrometry is used according to the different polarities of bisphenols and phthalates. The method is validated by assessing system suitability, linearity, accuracy, precision, homogeneity, and stability. The determination coefficients are higher than 0.99, which is acceptable. The percentage recovery and coefficient of variation of the accuracy and precision confirm that this analytical method is capable of simultaneously quantifying bisphenols and phthalates in corn oil. The bisphenols and phthalates in the formulations and pretreatment samples are stable for 7 d at room temperature and 24 h in an auto-sampler. Therefore, this validated analytical method is effective for the simultaneous quantification of bisphenols and phthalates in oils.

Reliability-Based Capacity Rating of High-Speed Rail-Road Bridges (신뢰성에 기초한 고속철도 교량의 내하력평가)

  • 조효남;이승재
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 1995.04a
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    • pp.73-81
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    • 1995
  • In Korea, the pilot construction of the first high-speed railroad on the Seoul-Pusan has already started 2 years ago. In the thesis, an attempt is made to develop reliability-based integrity-assessment models for the computer-aided control and maintenance of high-speed railroad bridges. The strength limit state models for PC railroad bridges encompass the bending and shear strengths as well as the strength interaction equations which simultaneously take into the element and system reliablities of the proposed limit states and reliability models. Then, the actual load carrying capacity and the realistic safety of bridges are evaluated using the system reliability-based equivalent strength, and the results are compared with those of the element reliability-based or conventional methods. Various parametric studies are performed for the proposed reliability-based safety and integrity-assessment models using the actual PC box girder bridges used in the pilot construction. And the sensitivity analyses are performed for the basic random variables included in strength limit state models. It is concluded that proposed models may be practically applied for the rational assessment of safety and integrity of high speed railroad bridges.

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Development of Risk-Based Inspection(RBI) Technology for LNG Plant Based on API RP581 Code (API RP 581 Code를 기반으로한 LNG 플랜트의 Risk-Based Inspection(RBI) 기술 개발)

  • Choi, Song-Chun;Choi, Jae-Boong;Hawang, In-Ju
    • Corrosion Science and Technology
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    • v.11 no.5
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    • pp.179-183
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    • 2012
  • As one of promising solutions to overcome high oil price and energy crisis, the construction market of high value-added LNG plants is spotlighted world widely. The purpose of this study is to introduce LNG-RBI system to develop risk assessment technology with RAM(Reliability, Availability, Maintainability) modules against overseas monopolization. After analyzing relevant specific features and their technical levels, risk assessment program, non-destructive reliability evaluation strategy and safety criteria unification class are derived as core technologies. These IT-based convergence technologies can be used for enhancement of LNG plant efficiency, in which the modular parts are related to a system with artificial optimized algorithms as well as diverse databases of facility inspection and diagnosis fields.

Development of LCA-EFD System for Environment (효율적인 LCA적용을 위한 EFD 시스템 개발)

  • Kim Dong-Jin;Yang Gwang-Mo;Jeon Hyeon-Jeong;Gang Gyeong-Sik
    • Proceedings of the Safety Management and Science Conference
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    • 2004.11a
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    • pp.39-46
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    • 2004
  • As environmental damage increase by a highly developed material civilization of today, many companies take a growing immensely interest in the influence of environment for beginning a new paradigm year by year. The previous assessments dose not run the gamut of industry but is confined within a certain facility or an area. Industrial processes and operations can not be accomplished independently but are connected with each others through suppliers and customer, and these ideas are fundamental notions of Life Cycle Assessment(LCA). This paper will introduce Life Cycle Assessment(LCA) n environment which is rising, and would like to build environmental management system using approach of Quality Function Development(QFD) and Safety Function Development(SFD) belonging to the assessment method.

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Management Approach Based on Quantitative Risk Assessment (정량적 리스크 평가를 기초로 한 경영관리)

  • Jung, Won
    • Journal of Applied Reliability
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    • v.8 no.4
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    • pp.167-179
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    • 2008
  • System risk is the totality of all safety risks to customers, employees, suppliers, and other third parties that arise due to system operations. To assess the risk of major hazards with the potential to cause fatality to the customers and other members of the public, quantitative risk assessment methodologies are used. This paper presents the general principles of risk based management approach to improve the safety of high risk systems such as aviation, railway, and nuclear power plants. For the suitable risk control arrangement, case studies of acceptable risk level, risk rating matrix, and safety management philosophy are presented.

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A Study on the Development of Torsion Analysis Method for Buildings Using Rapid Safety Assessment System Based on Accelerometers (진동계측자료 기반 안전성평가 시스템을 활용한 건축물의 비틀림 분석 방법 개발)

  • Jeong, Seong-Hoon;Jang, Won-Seok;Lee, Jung-Han;Park, Byung-Cheol
    • Journal of the Earthquake Engineering Society of Korea
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    • v.25 no.6
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    • pp.275-281
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    • 2021
  • In this study, algorithms for analyzing the torsion of buildings under earthquake excitation are developed. The algorithm and formulations to account for the torsional angle are verified by analyzing the seismic acceleration time history data. The method was applied to the reference buildings to examine their operation and usability. The reference application demonstrated that the noise-canceling scheme successfully overcame various obstacles in the field measurements. The developed method is expected to be used as a tool to support a loss assessment system for determining the direction and priority of disaster response in the event of an earthquake.

Dynamic Response based System Reliability Analysis of Structure with Passive Damper - Part 2: Assessment of System Failure Probability (수동형 댐퍼를 장착한 구조물의 동적응답기반 신뢰성 해석 - 제2편: 시스템 파괴확률 산정)

  • Kim, Seung-Min;Ok, Seung-Yong
    • Journal of the Korean Society of Safety
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    • v.31 no.5
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    • pp.95-101
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    • 2016
  • This study proposes a multi-scale dynamic system reliability analysis of control system as a method of quantitative evaluation of its performance in probabilistic terms. In this second paper, we discuss the control effect of the viscous damper on the seismic performance of the structure-level failure. Since the failure of one structural member does not necessarily cause the collapse of the structural system, we need to consider a set of failure scenarios of the structural system and compute the sum of the failure probabilities of the failure scenarios where the statistical dependence between the failure scenarios should be taken into account. Therefore, this computation requires additional system reliability analysis. As a result, the proposed approach takes a hierarchial framework where the failure probability of a structural member is computed using a lower-scale system reliability with the union set of time-sequential member failures and their statistical dependence, and the failure probability of the structural system is again computed using a higher-scale system reliability with the member failure probabilities obtained by the lower-scale system reliability and their statistical dependence. Numerical results demonstrate that the proposed approach can provide an accurate and stable reliability assessment of the control performance of the viscous damper system on the system failure. Also, the parametric study of damper capacity on the seismic performance has been performed to demonstrate the applicability of the proposed approach through the probabilistic assessment of the seismic performance improvement of the damper system.

A Study on Safety of Airborne Software and Considerations during Development (항공용 소프트웨어 안전성 및 개발시 주의사항에 대한 고찰)

  • Yi, Baeckjun;Choi, Jong Yeoun;Nam, Gi Wook
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.24 no.2
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    • pp.81-85
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    • 2016
  • It is recognized that safety is a key point of technical competency. Its adoption is widely spread in development of products and it is essentially necessary in aerospace industry because airborne system and equipment are used complex high-technology and implemented systematic performance using software. This study reviews system safety assessment, development assurance level, airborne software, RTCA DO-178 process, and considerations & pitfalls in software development.

A Study on the Survivability Assessment System of Damaged Ships (손상선박의 생존성 평가 시스템에 관한 연구)

  • Lee, Dong-Kon
    • Journal of the Society of Naval Architects of Korea
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    • v.40 no.2
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    • pp.34-40
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    • 2003
  • Ship damage due to maritime casualties lead to marine pollution, loss of life and properties. The maritime casualties come from the rough sea and bad weather condition generally. Therefore the large-scaled casualties will be derived from loss of structural strength and stability due to the progressive flooding and enlargement of damage by the effect of wave and wind. The improvement of damage survivability is very important in maritime safety This paper described the damage survivability assessment system which can be evaluate and improve the ship safety in consideration of loading, sea and damage condition. The components of the system and decision criteria for damage stability and structural safety is established. The ship modeler and behavior analysis program in wave is developed. Finally further research work is also discussed.

Analysis of the IMO's Role for Safe Maritime Transport System

  • Kim, Inchul;An, Kwang
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.21 no.3
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    • pp.266-273
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    • 2015
  • Keeping in mind that there are only limited social, economic and administrative resources for reducing marine casualties, the result of statistical survey showed the loopholes of safe maritime transport system, and rendered that most casualties occurred in coastal waters by human errors. When the IMO Marine Casualty Investigation Code was utilized to reveal any structural vulnerability of the international measures, IMO was required to expand its roles to enhance the interface between Liveware and Environment of SHEL model. So, several risk assessment models were studied and found that Maritime Safety Audit System of the Republic of Korea could be a good example of enhancing safe interface between navigators (Liveware) and the navigational circumstances (Environment). It could be dealt with at IMO level as a tool for applying at human error enforcing waters. International cooperative research for upgrading risk assessment modes should also be future terms of reference.