• Journal of Advanced Marine Engineering and Technology
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• 제21권5호
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• pp.542-548
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• 1997

In this study an evaluation method of fatigue strength of membrane type LNG tank is presented with FEM analysis and experimental approach of seam and raised edge welds. The study contains the following : l)FEM analysis of test specimens 2)Fatigue tests of seam and raised edge welds 3)Estimation of cumulative damage factor of the welds on the basis of safe life design concept complying with the rules of classification society 4)Review of the effect of mean stress on the fatigue strength 5)Modelling of fatigue life of the welds which is changeable by weld heights With the results obtained in this study, a model ${\Delta}{\delta}/h^2=0.13553\;{N_{f}}^{-0.3151}$ for seam and raised edge welds having a given weld height is proposed to be useful for designers and inspectors.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 1999년도 추계 학술발표회 논문집 Proceedings of EESK Conference-Fall
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• pp.265-272
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• 1999

there is no earthquake resistant design code for the unreinforced masonary(URM) buildings in Korea. But it does not mean that all URM buldings in Korea is safe under the possible extent of an earthquake. The purpose of this study is in the inelastic analysis of unreinforced masonary walls with many different types of openings and carry out their ductilities an strengths, response modification factor of each wall has been compared and the most appropriate response modification factor for URM building in Korea has been proposed.

• 한국안전학회지
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• 제33권5호
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• pp.101-108
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• 2018

This study was carried out to obtain baseline data on the causes of industrial accidents and their prevention by investigating structural models between the Shipyard workers' egogram ego-states (CP: Critical Parent, NP: Nurturing Parent, A: Adult, FC: Free Child, AC: Adapted Child), safe and unsafe behaviors, and industrial accidents (frequency/severity). In order to achieve this goal, 378 workers from 3 locations of major corporations in Geojedo Island and Ulsan took a questionnaire, which was then analyzed with a structural equation model using the SPSS 23.0 and AMOS 24 statistics package, and the main results of the study are as follows. First, NP and A's ego-states had a positive influence on safe behavior, AC's ego-state had a negative influence on safe behavior, and A's ego-state had the largest influence on safe behavior. Second, CP and AC's ego-states had a positive influence on unsafe behavior, and A's ego-state had a negative influence on unsafe behavior. AC's ego-state had the largest influence on unsafe behavior. Third, safe behavior did not have a significant influence on industrial accidents. However, unsafe behavior had a positive influence on industrial accident frequency and industrial accident severity, both sub-factors of industrial accidents. This study, despite its limitations, such as sampling limitations, has the following significance. First, this study verified that ego-state, a psychological characteristic, is an important factor for predicting unsafe behavior that induces industrial accidents. Second, in order to reduce industrial accidents, there is a need to stimulate the A ego-states, and promote continuous safety management and safety education to neutralize the AC ego-state. Third, previous studies were limited in the area of practical methods for reducing unsafe behaviors, but this study presents practical methods for reducing unsafe behaviors by verifying the structural relationship between safe/unsafe behaviors and industrial accidents by selecting ego-gram ego-states, variable personality theory, as an independent variable.

• 동력기계공학회지
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• 제20권6호
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• pp.80-86
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• 2016

In this study, The watertight damper was designed to improve conventional DN 350A butterfly valve. The FSI(Fluid-Structure Interaction) analysis has performed to investigate the safety factor for the watertight damper. When watertight damper of disk was closed, the disk of pressure value is constant. However depending on the opening angle of disk, the flow velocity and pressure are changed. The maximum velocity was appeared at the end of disk on the small outlet area of duct. When the opening angel of disk is $90^{\circ}$, the maximum velocity was appeared at the center of ending disk. So we were found the opening angle of disk is bigger, the flow rate is increased and velocity is also increased from the result of FSI analysis. We can find the least deformation and stress when the opening angel of damper is $90^{\circ}$. When the $45^{\circ}$ opening angle of disk, the largest deformation and stress was found and the minimum safety factor 1.3 was calculated. As a result, we found that the structure of watertight damper is safe enough irrespective of opening angel.

• 한국시뮬레이션학회논문지
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• 제18권1호
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• pp.35-40
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• 2009

분산 네트워크의 사용이 증가함에 따라 분산 작업을 신뢰성 있게 수행하기 위한 연구가 중요한 이슈로 등장하고 있다. 분산 네트워크에서의 작업의 수행은 인터넷 상의 유효자원에서 수행되므로, 가용한 자원에까지 효율적으로 접근할 수 있는가와 수행된 결과가 안정적으로 요청자에게 전달되는 것은 중요한 문제이다. 그래서 본 논문에서는 작업의 수행을 요청하는 곳에서 실제 작업이 실행되는 위치의 자원까지 데이터를 안전하게 전송하기 위한 생존성 인자를 설정하고, 생존성 인자의 값에 따른 데이터 전송속도를 측정하기 위한 성능평가를 수행하였다. 또한 제시한 생존성 인자를 활용한 안전한 전송을 보장할 수 있는 전송 알고리즘을 제시하였다.

• 한국측량학회지
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• 제29권1호
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• pp.11-20
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• 2011

이 연구의 목적은 자전거 이용과 관련하여 주변의 환경요소를 고려한 안전하고 편리한 자전거 도로 설계 개선 및 정보제공방안에 대하여 연구하는데 있다. 이 연구에서는 기존 자전거 도로 설계 및 시공사례 분석을 통하여 현장여건을 반영한 자전거 도로 설계 방안을 수립하고 자전거 도로의 유형별 교통사고 유형 분석, 현황측량, 현지조사 등을 통하여 안전하고 편리한 자전거 도로 건설을 위한 자전거 도로의 유형별 최적 설계방안을 제시하였다. 안전한 자전거 도로 설계를 위해서는 주변환경 요소를 고려한 제원, 폭원, 곡선반경, 오르막차로 등에 대한 자전거 도로 최적설계와 안전표지 안전시설 분리시설 설치를 통하여 교통수단별 이용자간의 통행분리가 이루어져야 함을 알 수 있었다. 또한 안전한 자전거 도로 설계를 위해서는 최소한의 자전거 이용자의 주행 공간 및 자전거 도로 간의 연결성이 확보되어야 하며 자전거 이용자의 활성화를 위해서는 경사, 노선정보, 편의시설위치, 대중교통 연계정보 등 자전거도 도로의 안전 및 편의관련정보를 제공하여야 할 것으로 판단된다.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제29권3호
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• pp.7-15
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• 2023

Purpose: This study was conducted with the aim of presenting spatial planning directions for evacuation spaces based on an analysis of the performance of horizontal evacuation during the early stages of fire incidents in a geriatric hospital. Methods: Based on a review of previous studies, the research model was designed by establishing occupancy conditions, evacuation, and fire scenarios. The analysis model was developed by considering vulnerable areas in terms of evacuation movement and analyzing the results of evacuation performance. Furthermore, the study analyzed the improvement in evacuation performance by arranging refuge areas. Results: The results of the study are as follows. Firstly, vulnerability spots were identified in terms of evacuation performance by schematizing Required Safe Egress Time, Available Safe Egress Time, and their differences. Secondly, the Required Safe Egress Time in the adjacent public spaces along the escape routes of occupants was found to be higher compared to the Available Safe Egress Time. Thirdly, the results of the correlation analysis between the difference in Available Safe Egress Time and Required Safe Egress Time during the early stages of a fire, as well as their constituent factors, demonstrated that user congestion is a more significant factor in compromising evacuation safety than the physical changes in the fire condition. Fourthly, the analysis of evacuation time was conducted by designating refuge areas where occupants can evacuate within a sufficient timeframe. This led to a decrease in the Required Safe Egress Time. Implications: This study is expected to be used as data on the direction of evacuation space planning to improve the evacuation performance of Geriatric Hospital.

• 품질경영학회지
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• 제50권4호
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• pp.635-646
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• 2022

Purpose: In this study, the detailed implementation plan for product safety evaluation and management suggested by KS A ISO 10377 to reduce the risk of harm to consumers and users is presented so that companies can strategically implement it. Methods: In order to achieve the purpose of this study, the upper elements and detailed execution plans shown in KS A 10377 are classified into hierarchies and set as a decision hierarchy. A pairwise comparison is performed to derive it. Results: Among the top factors, 'design safety (D)' was the most important factor, with 0.314. Therefore, ensuring safety in the design stage that can prevent defects in advance is the most important action plan for companies to supply safe products. Conclusion: The results of this study, it is intended to help companies and related organizations more easily understand and continuously apply KS A ISO 10377.

• 해양환경안전학회지
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• 제14권2호
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• pp.157-162
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• 2008

선박의 충돌회피조선에 있어서 조종성능은 중요한 요소이다. 일반적으로 사용되는 조종성능은 심수역을 대상으로 작성되며, 천수역을 항주하는 선박의 조종성은 일반적으로 선회성은 저하되고 침로안정성 또는 추종성은 향상된다. 이러한 선회성의 변화는 충돌회피에 있어 위험을 초래할 수 있다. 본 연구에서는 천수역의 조종성능을 반영함과 동시에 충돌위험정도를 쉽게 파악할 수 있도록 하기 위한 가변안전경계영역의 새로운 적용기법을 제시하였다. 수학적 수치시뮬레이션 검증을 통하여 새롭게 제안된 기법의 유용성을 확인하였다. 따라서 선박충돌위험에 대한 충분한 충돌회피 조선을 지원할 수 있을 것으로 기대된다.

• 대한안전경영과학회지
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• 제16권4호
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• pp.257-262
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• 2014

Risk information may be one of the most important factor for worker's safe behavior because that safe behavior can be oriented by attitude based on risk information. Traditionally KAP(knowledge, attitude and practice) model was useful frame for the change of human behavior. Knowledge is formed by information through experience and education. Worker's health may be prevented by his or her own active safe behavior based on risk information. This paper is to investigate the effect of labor union on the provirion of risk information by labor union. Data for analysis is the third Korean Working Conditions Survey done by Occupational Safety and Health Research Institute in 2011. The sample size is 50,032 economic active person surveyed by household interview survey with structure questionnaire by trained interviewer. The difference of risk information provision among employees was tested by mean difference test. The level of risk information of employees of companies with labor union is higher than that with non labour union. This paper has some implication for the promotion of safe behavior of employees through risk information provision mediated by labor union. Some limitation of this study may be considered because of using the cross sectional survey data.