• Title/Summary/Keyword: 안전성능평가

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Suggestion of Priority Decision Method for Performance Evaluation Based on Risk Index for Small and Medium Sized Bridges (위험도 지수 기반 중소규모 교량 성능평가 우선순위 결정 방안 제안)

  • Lee, Hee-Hyun;Shin, Byoung-Gil;Lee, Yeong-Il;Kim, Young-Min
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.23 no.6
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    • pp.70-76
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    • 2019
  • This paper presents a methodology for priority decision of performance evaluation of small-and-medium-sized highway bridges. This methodology could be used for establishing a maintenance strategy of those bridges which are not liable to the law of the Special Act on the Safety Control and Maintenance of Establishments and are thought laid under blind spot. The risk index are calculated considering vulnerability and social influence, then the bridges are classified as three types, one requiring immediate evaluation, the other one requiring evaluation within next year, and the third one observing, according to the index. The suggested method was applied to a small bridge under service and its field applicability verified. From this study, it was judged that this methodology could be used appropriately for establishing maintenance strategy and saving the maintenance budget.

Study on the Free Roll Decay and Resistance Performances of Fishing Vessels by Varying Appendages (어선 부가물 별 자유 횡 동요 감쇠 및 저항성능에 관한 연구)

  • Mijin Yoon;Janghoon Seo;Dong-Woo Park;Chanjae Lee;Intae Kim;Dong Nam
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.29 no.6
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    • pp.688-696
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    • 2023
  • In the present study, free roll decay and resistance performances of fishing vessels were evaluated with the combinations and variations of in the parameters of appendages which are attached to improve motion performance of fishing vessels. Computational Ffluid Ddynamics was used to perform free roll decay and resistance analysis. The roll period and decay coefficient were derived by the variations in the combination and dimensions of the primary appendages of the bilge keel and the under keel. It was observed thatThe variations of in the length of the under keel did not significantly impact to the roll damping coefficient. Conversely, for the bilge keel, an increase in the length and angle resulted in an increase in the roll damping coefficient. Comparison of resistance performance was additionally assessed among the selected hulls with the appendages and bare hull. The resistance of the hull with the appendages was higher than that of the bare hull due owing to the changes of in the pressure on the surface of the hull and trim angle. Throughout the present study, the impact of appendage parameter and arrangement on the free roll decay and resistance performance of fishing vessels were was assessed,. which This will be beneficial for the application of appendages to fishing vessels.

Improvement of Seismic Performance Evaluation Method for Concrete Dam Pier by Applying Maximum Credible Earthquake(MCE) (가능최대지진(MCE)을 적용한 콘크리트 댐 피어부 내진성능평가 방안 개선)

  • Jeong-Keun Oh;Yeong-Seok Jeong;Min-Ho Kwon
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.27 no.6
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    • pp.1-12
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    • 2023
  • This paper assesses the suitability of existing standards for plastic material models and performance level evaluation methods in seismic performance evaluations of concrete dam piers during Maximum Credible Earthquakes (MCE). Dynamic plastic analysis was conducted to examine the applicability of the plastic material model under various conditions. As a result reveal that when the minimum reinforcement ratio is not met, the average stress-average strain method recommended in current dam seismic performance evaluation guidelines tends to underestimate pier responses compared to the predicted outcomes of dynamic elastic analysis. Consequently, the paper proposes an improvement plan that treats dam piers with an insufficient minimum reinforcement ratio as unreinforced and integrates fracture energy into concrete tensile behavior characteristics for performance level evaluation. Implementing these improvements can lead to more conservative evaluation outcomes compared to current seismic performance evaluation methods.

Evaluation of Popping Performance of Safety Valves in City Gas Facilities (도시가스시설에서 안전밸브의 분출성능에 관한 평가 연구)

  • 김영규;김청균
    • Journal of the Korean Society of Safety
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    • v.13 no.2
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    • pp.104-108
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    • 1998
  • In order to evaluate the performances of safety valves for low pressure, the popping pressure and flow rate of the natural gas have been investigated. The measured results of the popping pressure show that there is a big scattering depending on the manufacture year of a safety valve. And sample A showed the ideal popping pressure mode compared to other B and C samples. The popping flow rate of the safety valve is proportional to the seat size as the inlet pressure increases. These results may be used as a guideline for a design and diagnosis of the safety valve.

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- A Study on Control Charts for Safety and Environmental Performance Evaluation - (안전 및 환경성능평가를 위한 관리도에 관한 연구)

  • Choi Sung Woon
    • Journal of the Korea Safety Management & Science
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    • v.6 no.4
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    • pp.195-213
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    • 2004
  • This paper deals with an efficient and effective method on measuring, monitoring and evaluating safety and environmental performances of a process using SPC control charts. We propose 7 safety control charts as a tool to monitor hazard dendritics, and we propose 15 environment control charts to monitor pollution emissions. We also propose useful guidelines that SPC(Statistical Process Control) control charts can be used for safely and environmental monitoring.

A Study on the Implementation of Aircraft System Safety Assessment using Probabilistic Analysis of Failure Data (고장 데이터의 확률 분석을 적용한 항공기 시스템 안전성 평가 수행 방안 연구)

  • Yoo, Seung-woo;Kim, In-Gul
    • Journal of Aerospace System Engineering
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    • v.14 no.spc
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    • pp.31-38
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    • 2020
  • The aircraft system safety assessment, which is emphasized in the development and certification of aircraft, is a systematic and comprehensive evaluation process to determine that all relevant failure conditions have been identified and that all significant combinations of failures cannot result in unacceptable hazards. As the aircraft systems become more complex and require integrated function and performance, proper safety objectives must be established and appropriate assessments are need to be accompanied. This paper has prepared to propose the efficient probabilistic analysis of failure data to evaluate the risk level over the entire aircraft lifecycle through the safety assessment and to review the considerations for aircraft certification and safety improvement.

A Study on the Improvement of Member Evaluation Method in the Condition Evaluation of Reinforced Concrete Buildings (철근콘크리트 건축물의 상태평가 중 부재평가방법 개선에 관한 연구)

  • Woo, Hye-Sung;Yi, Waon-Ho;Hwang, Kyung-Ran;Lee, Kwan-Hyeong
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.25 no.3
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    • pp.85-91
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    • 2021
  • Type 1 and type 2 buildings must regularly conduct precise safety inspections and precise safety diagnosis for the safety and maintenance of facilities, and the safety grade of the building is determined according to the results of the implementation. In addition, the cycle of inspection and diagnosis is determined according to the safety grade of the building. In order to determine the safety grade of the building, a precise safety inspection conducts condition evaluation, and a precise safety diagnosis conducts condition evaluation and safety evaluation. Therefore, since the inspection and diagnosis cycle is determined according to the safety grade of the building, the condition evaluation and safety evaluation must be precise. However, in the case of member unit evaluation, which is the first step in evaluating the current condition, the evaluation grade is determined by using the representative value of the measurement result, and this may result in an error in the evaluation grade. To solve this problem, this study analyzed evaluation criteria for each evaluation item and presented evaluation criteria using inequalities to respond to measurement results and evaluation scores. In addition, we present a functional formula that can reflect performance scores for each evaluation item.