• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2009년도 춘계학술대회 논문집
• /
• pp.287-288
• /
• 2009

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2008년도 춘계학술대회 논문집
• /
• pp.153-154
• /
• 2008

• Journal of Welding and Joining
• /
• 제18권3호
• /
• pp.68-75
• /
• 2000

The incomplete penetration(IP) discontinuity in butt joint weld, which is detected during safety analysis of the steel bridge by nondestructive evaluation(NDE) method, is classified as unacceptable defect according to the NDE codes and standards. In fact, there are a little allowance in butt joint weld in the view point of design criterion, and also detected IP discontinuity should be classified and evaluated for the fatigue strength and residual life estimation. In this study, we performed fatigue test to evaluate the fatigue strength of high strength steel(SWS490A) containing IP discontinuities in various size, the results compared and classified according to the bridge construction standard specification which published by korea administration of construction and traffic. Experimental results could be used to evaluate and estimate the IP discontinuities considering different stress range in butt joint bridge weld during periodic safety inspection.

• 정보처리학회논문지:소프트웨어 및 데이터공학
• /
• 제10권5호
• /
• pp.187-194
• /
• 2021

사람의 행동인식(Action Recognition)은 사람의 관절 움직임에 따라 어떤 행동을 하는지 인식하는 것이다. 이를 위해서 영상처리에 활용되는 컴퓨터 비전 태스크를 활용하였다. 사람의 행동인식은 딥러닝과 CCTV를 결합한 안전사고 대응서비스로서 안전관리 현장 내에서도 적용될 수 있다. 기존연구는 딥러닝을 활용하여 사람의 관절 키포인트 추출을 통한 행동인식 연구가 상대적으로 부족한 상태이다. 또한 안전관리 현장에서 작업자를 지속적이고 체계적으로 관리하기 어려운 문제점도 있었다. 본 논문에서는 이러한 문제점들을 해결하기 위해 관절 키포인트와 관절 움직임 정보만을 이용하여 위험 행동을 인식하는 방법을 제안하고자 한다. 자세추정방법(Pose Estimation)의 하나인 AlphaPose를 활용하여 신체 부위의 관절 키포인트를 추출하였다. 추출된 관절 키포인트를 LSTM(Long Short-Term Memory) 모델에 순차적으로 입력하여 연속적인 데이터로 학습을 하였다. 행동인식 정확률을 확인한 결과 "누워있기(Lying Down)" 행동인식 결과의 정확도가 높음을 확인할 수 있었다.

• 한국안전학회지
• /
• 제34권2호
• /
• pp.40-47
• /
• 2019

The Half-depth precast deck is a structural system that utilizes pre-cast panels pre-built at the factory as formwork at the construction stage and as a major structural member at the same time after completion. These systems have joints between segments, and the detail and performance of the joints are factors that have a very large impact on the quality, such as the constructability and durability of the bridge decks. In this study, strength performance evaluation was performed for improved joints using connecting rebar by experimental method. Static loading tests were conducted on the test specimen with improved joint, those with existing joint and those without joint. The test results of the specimens were compared to each other, and the flexural strength required by the design was compared. The flexural strength required in the design was presented by finite element analysis. It has been shown that the flexural strength of the specimens with joints were more than twice that required by the design. But the flexural strength of the specimen with existing joint was about 84% of that without joint. The flexural strength of the specimen with improved joints was a nearly similar degree of that compared to the specimen without joint. And a comparison of the moment-deflection relationship curves of the two specimens also shows a very similar flexural behavior. It is confirmed that improved joint has sufficient flexural strength. In addition to strength, the bridge decks require serviceability, such as deflection and cracking, and in particular, fatigue resistance due to repetitive live loads is an important performance factor. Therefore, further verification studies are required.

• 대한교통학회지
• /
• 제34권3호
• /
• pp.263-277
• /
• 2016

고속도로 공사구간은 차로의 차단 및 공사구간 내 다양한 시설물에 운전자가 노출되기 때문에 사고가 빈번하게 발생하는 구간이다. 공사구간 중 완화구간은 차로차단으로 인하여 차량의 합류가 발생하므로 사고의 위험도가 높다. 따라서 본 연구에서는 주행 시뮬레이션(Driving Simulation)과 교통 시뮬레이션 (Traffic Simulation)의 연계 분석을 적용하여 세 가지 유형의 차로합류 기법에 대한 안전성을 비교 평가하였다. 분석 결과, 기존 차로차단 기법보다 사전 유도기법 또는 Joint Merge기법이 안전성 측면에서 효과적인 것으로 나타났다. 서비스 수준(LOS) A, B인 경우 사전 유도기법이 적정 합류기법으로 판단되었으며, 서비스 수준 C의 경우 Joint Merge기법이 적정 합류기법으로 판단되었다. 본 연구는 현재 운영되고 있는 차로차단 기법 외에 공사구간 교통상황에 따른 다양한 합류기법의 적용 타당성을 주행 및 교통 시뮬레이션의 연계분석을 통하여 안전성 관점에서 평가하였다는 데 의의가 있다.

• 근관절건강학회지
• /
• 제24권1호
• /
• pp.14-23
• /
• 2017

Purpose: The purpose of this study was to identify the factors affecting the perceptions of patient safety culture, safety care knowledge, and safety care activity among nurses at orthopedic hospitals. Methods: Data were collected during Feb. 16 and Feb. 26, 2017, from 195 nurses of 9 small to medium sized orthopedic hospitals. Questionnaires about patient safety culture, safety care knowledge and activity were used. Data were analyzed by descriptive statistics, t-test, ANOVA, $Scheff\acute{e}$ test, Pearson's correlation coefficient, and stepwise multiple regression. Results: The safety care activity was positively correlated with perceptions of patient safety culture (r=.50, p<.001) and knowledge (r=.48, p<.001). Factors that had influence on the safety care activity were the patient safety culture (${\beta}=.30$, p<.001), age (${\beta}=.27$, p<.001), and knowledge of the safety activity (${\beta}=.21$, p=.004). The patient safety care activity was explained 36.6% by those factors. Conclusion: To enhance the patient safety care activity, it should be provided the environment and open communication for the perceptions of patient safety culture and the in service education program for safety care knowledge.

• Nuclear Engineering and Technology
• /
• 제54권7호
• /
• pp.2510-2518
• /
• 2022

The main purpose of collecting and analyzing operating experience events is to look for insights to improve safety. The underlying assumption is the correlation and causality between events with different safety significances. The analysis of this assumption could be valuable to optimize operating experience feedback programs and to enhance safety. This paper analyses the correlation between events with different safety significances. Groups of events from six nuclear energy related databases are considered. The findings are that a correlation exists but with various levels and not as large or consistent as might be expected across different databases. These results might be the basis for further work to analysis causality, to find out how a similarity in causes influences the correlation, and finally to improve the operating experience program.

• 한국방사성폐기물학회:학술대회논문집
• /
• 한국방사성폐기물학회 2018년도 추계학술논문요약집
• /
• pp.31-32
• /
• 2018

• 근관절건강학회지
• /
• 제24권2호
• /
• pp.140-149
• /
• 2017

Purpose: This study aimed to explore the influences of sense of ethics and attitude toward patient safety in confidence in patient safety in nursing students. Methods: This descriptive study was conducted with 198 students who had clinical practices in two nursing schools. Sense of ethics, attitude and confidence about patient safety were measured by a questionnaire. Data were analyzed with SPSS/WIN 19.0 using descriptive statistics, t-test, ANOVA, Pearson's correlation coefficient, and multiple regression analysis. Results: There were significant differences in satisfaction with nursing major by grade. There were significant positive correlations among sense of ethics, attitude toward patient safety, confidence in patient safety, view on patient's safety, and satisfaction with nursing major. Confidence in patient safety was associated with sense of ethics, attitude toward patient safety, and view on patient's safety, with 37.6% of the variance. Conclusion: The findings suggest that we need to develop curriculums for undergraduate students to improve their sense of ethics and patient safety. Further research is needed to examine educational needs on patient safety in nursing students.