• 한국철도학회논문집
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• 제20권4호
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• pp.558-567
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• 2017

본 연구는 국내 철도운영기업 종사자 중 철도교통관제사들을 대상으로 그들이 인지하고 있는 이직의도에 대하여 실증분석 하였다. 이직의도에 영향을 미치는 변수들은 타 분야에서 활발히 연구되고 진행되고 있는 변수(임파워먼트, 직무스트레스, 직무만족, 조직몰입, 소진)를 이용하였다. 분석결과 철도교통관제사들의 임파워먼트는 직무스트레스, 이직의도에 직접적인 영향을 미치지 않았으며, 직무만족, 조직몰입, 소진에 직접적인 유의한 영향을 미치는 것으로 나타났다. 직무스트레스는 직무만족, 조직몰입, 소진에 직접적인 영향을 주지 않는 것으로 나타났으며, 직무만족 또한, 조직몰입, 소진, 이직의도에 직접적인 영향을 주지 않는 것으로 나타났다. 소진은 이직의도에 직접적인 영향을 주는 것으로 나타나 철도교통관제사의 소진이 이직의도에 영향을 주는 것으로 나타났다. 결론적으로 임파워먼트가 소진에 직접적인 영향을 주고, 소진은 이직의도에 직접적인 영향을 주는 변수인 것을 나타난 바, 본 연구는 철도교통관제사들의 이직예방을 위해서는 임파워먼트 와 소진의 감정관리가 중요하다는 사실을 시사하고 있다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2009년도 춘계 학술발표회
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• pp.11-16
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• 2009

Better understanding of in-situ mechanical behavior of pavement foundations is very important to predict long-term effects on the system performance of transport infrastructure. In order to do that, resilient stiffness characterization of geomaterals is needed to properly adopt such mechanistic analysis under both traffic and environmental loadings. In this paper, in situ monitoring data from KHC test road was used to analyze the non-linearity of stress conditions under traffic and moisture loadings. Then, the predicted non-linear response using finite element method with a selected constitutive model of foundation geomaterials are verified with the field data.

• 동의신경정신과학회지
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• 제32권1호
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• pp.1-11
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• 2021

Objectives: To investigate the prevalence of acute stress disorder (ASD) and post-traumatic stress disorder (PTSD) in patients with traffic injuries. In addition, PTSD patients was classified using 'pattern identification for jing ji and zheng chong'. Methods: Questionnaires such as the primary care PTSD screen for DSM-5(PC-PTSD-5), Korean version of PTSD checklist-5 (PCL-5-K), and the instrument of pattern identification for jing ji and zheng chong were conducted on 195 patients within 3 days to 1 year after traffic accidents. Patients were recruited from six medical institutions. Collected data were used to determine the prevalence of acute stress disorder and post-traumatic stress disorder. Results: On PC-PTSD-5, the prevalence was 39.1% for ASD and 50% for PTSD. On PCL-5-K, the prevalence was 20.4% for ASD and 29.3% for PTSD. Satisfying both PC-PTSD-5 and PCL-5-K, the prevalence was 18.2% for ASD and 25.8% for PTSD. As a result of pattern identification for jing ji and zheng chong, 'weakness of heart and gall bladder type' accounted for the highest proportions in both ASD and PTSD groups. Conclusions: In this study, the prevalence was 39.1% for ASD and 50% for PTSD by PC-PTSD-5. Satisfying both PC-PTSD-5 and PCL-5-K, the prevalence was 18.2% for ASD and 25.8% for PTSD. Further large-scale prospective studies are needed to analyze the prevalence of ASD and PTSD, the rate of progression from ASD to PTSD, and the type of pattern identification.

• Structural Engineering and Mechanics
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• 제17권5호
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• pp.655-670
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• 2004

This paper aims to evaluate the effect of typhoons on fatigue damage accumulation in steel decks of long-span suspension bridges. The strain-time histories at critical locations of deck sections of long-span bridges during different typhoons passing the bridge area are investigated by using on-line strain data acquired from the structural health monitoring system installed on the bridge. The fatigue damage models based on Miner's Law and Continuum Damage Mechanics (CDM) are applied to calculate the increment of fatigue damage due to the action of a typhoon. Accumulated fatigue damage during the typhoon is also calculated and compared between Miner's Law and the CDM method. It is found that for the Tsing Ma Bridge case, the stress spectrum generated by a typhoon is significantly different than that generated by normal traffic and its histogram shapes can be described approximately as a Rayleigh distribution. The influence of typhoon loading on accumulative fatigue damage is more significant than that due to normal traffic loading. The increment of fatigue damage generated by hourly stress spectrum for the maximum typhoon loading may be much greater than those for normal traffic loading. It is, therefore, concluded that it is necessary to evaluate typhoon induced fatigue damage for the purpose of accurately evaluating accumulative fatigue damage for long-span bridges located within typhoon prone regions.

• Safety and Health at Work
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• 제9권4호
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• pp.454-461
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• 2018

Background: Working conditions and psychosocial work factors have acquired an important role explaining the well-being and performance of professional drivers, including those working in the field of public transport. This study aimed to examine the association between job strain and the operational performance of public transport drivers and to compare the expositions with psychosocial risk at work of three different types of transport workers: taxi drivers, city bus drivers, and interurban bus drivers. Method: A sample of 780 professional drivers was drawn from three transport companies in Bogota (Colombia). The participants answered the Job Content Questionnaire and a set of sociodemographic and driving performance questions, including age, professional driving experience, work schedules, and accidents and penalties suffered in the last 2 years. Results: Analyses showed significant associations between measures of socio-labor variables and key performance indicators such road traffic accidents and penalties. Furthermore, multiple linear regression analysis contributed to explain significantly suffered accidents from key variables of the Job Demand-Control model, essentially from job strain. In addition, throughout post-hoc analyses, significant differences were found in terms of perceived social support, job strain, and job insecurity. Conclusion: Work stress is an issue that compromises the safety of professional drivers. This research provides evidence supporting a significant effect of job strain on the professional driver's performance. Moreover, the statistically significant differences between taxi drivers, city bus drivers, and interurban bus drivers in their expositions to work-related stress suggest the need for tailored occupational safety interventions on each occupational group.

• 한국산학기술학회논문지
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• 제14권11호
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• pp.5334-5337
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• 2013

본 논문에서는 도심 미관의 보완을 위해 와이어를 제거한 교통신호등의 구조 해석을 수행한다. 실제 교통신호등의 3차원 CAD 모델로부터 쉘 요소로 이루어진 유한요소 모델을 생성하였고, 특히 교통신호등의 지주 및 가로재는 모양, 두께, 보강재 등을 고려하였다. 풍하중을 적용하여 응력 및 변형 해석을 수행하였으며, 풍하중이 적용될 경우에 교통신호등에 미치는 결과를 분석하여 설계 개선에 대한 기본 작업을 수행하였다.

• Structural Engineering and Mechanics
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• 제55권1호
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• pp.111-135
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• 2015

Bridge behavior under passing traffic loads has been studied for the past 50 years. This paper presents how to model congestion on bridges and how the maximum dynamic stress of bridges change during the passing of moving vehicles. Most current research is based on mid-span dynamic effects due to traffic load and most bridge codes define a factor called the dynamic load allowance (DLA), which is applied to the maximum static moment under static loading. This paper presents an algorithm to solve the governing equation of the bridge as well as the equations of motions of two real European trucks with different speeds, simultaneously. It will be shown, considering congestion in eight case studies, the maximum dynamic stress and how far from the mid-span it occurs during the passing of one or two trucks with different speeds. The congestion effect on the maximum dynamic stress of bridges can make a significant difference in the magnitude. By finite difference method, it will be shown that where vehicle speeds are considerably higher, for example in the case of railway bridges which have more than one railway line or in the case of multiple lane highway bridges where congestion is probable, current designing codes may predict dynamic stresses lower than actual stresses; therefore, the consequences of a full length analysis must be used to design safe bridges.

• 동의신경정신과학회지
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• 제30권3호
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• pp.295-304
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• 2019

Objectives: The purpose of this case report was to propose Yangshimtang-Gamibang on three patients diagnosed with acute stress disorder. Methods: Yangshimtang-Gamibang was treated on three patients diagnosed with acute stress disorder after experiencing a traffic accident. The effects of Yangshimtang-Gamibang were evaluated through BAI (Beck Anxiety Inventory), NRS (Numerical rating scale), NDI (Neck Disability Index), ODI (Oswestry Disability Index), respectively, and quality of sleep was assessed with total sleep time and number of times waking up during sleep. Results: After the treatment, there was significant decrease in the value of BAI score, a measurement of anxiety, as well as the value of NRS, NDI, ODI, a measure of pain. Also, the sleep quality of three patients improved. Conclusions: The results indicate that Yangshimtang-Gamibang may have an effect on people with acute stress disorder who recently experienced a traffic accident.

• 한국산학기술학회논문지
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• 제20권12호
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• pp.254-264
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• 2019

본 연구는 교통사고 환자의 외상후 스트레스 장애 위험정도, 회복탄력성 및 사회적 관계망이 외상후 성장에 미치는 영향을 알아보기 위해 시도된 서술적 상관관계 연구이다. 연구대상자는 K도 C시 소재 100병상 이상 5개 병원의 교통사고 환자 158명이었으며, 2018년 7월 1일부터 8월 31일까지 구조화된 설문지를 이용하여 자료를 수집하였다. 수집된 자료는 t-test, ANOVA, Pearson's correlation coefficients, Multiple Regression으로 분석하였다. 외상후 성장에 미치는 영향요인을 파악한 결과, 연구의 설명력은 36.9%로 나타났으며, 대상자의 외상후 성장에 미치는 영향요인은 사회적 관계망, 외상후 스트레스 장애 위험정도 순으로 나타났다. 또한 사회적 관계망은 회복탄력성과 외상후 성장의 관계를 완전매개하였다. 이를 토대로, 교통사고 환자의 사회적 관계망이 크고 외상후 스트레스 장애 위험정도가 클수록 외상 후 성장이 높아짐을 확인하였고, 사회적 관계망은 회복탄력성과 외상후 성장의 관계를 완전매개한다는 것을 확인하였다. 따라서 교통사고 환자의 외상후 성장을 돕기 위해 사회적 관계망과 회복탄력성 향상 방안에 대해 모색할 필요가 있고, 교통사고 환자에 대한 반복적이고 장기적인 관찰을 통해 외상후 성장에 대한 추가연구가 필요할 것으로 사료된다.

• 인간식물환경학회지
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• 제24권6호
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• pp.639-649
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• 2021

Background and objective: Various images from visual display terminals (VDTs) as well as living lighting are important parts of our daily life; thus, properly controlling the lighting environment - that is, illuminance, color temperature and good images from VDTs - can have a substantial effect on improving the mental health and work efficiency in everyday life. We examined electroencephalography (EEG) and heart rate variability (HRV) responses to various lighting conditions in 25 university students as they viewed images of a green landscape or traffic congestion. Methods: EEG was performed in darkness and when the room was illuminated with 10 different light-emitting diode (LED) color temperatures, while the EEG and HRV responses to green landscape or traffic congestion image stimuli were measured in darkness and during room illumination with three different LED color temperatures. Results: We found a significant difference between darkness and high LED illumination (400 lx) at 7 (CZ, F4, FZ, O1, O2, OZ, and T6) of 30 channels, while the alpha wave activity increased during darkness. In the second experiment, the green landscape image stimuli in the 30 lx-2600 K lighting condition elicited theta wave activity on the EEG, whereas the traffic congestion image stimuli under high LED illumination elicited high beta and gamma wave activities. Moreover, the subjects exhibited better stress coping ability and heart rate stability in response to green landscape image stimuli under illuminated conditions, according to their HRV. Conclusion: These results suggest that lower color temperatures and illumination levels alleviate tension, and that viewing green landscape image stimuli at low illumination, or in darkness, is effective for reducing stress. Conversely, high illumination levels and color temperatures are likely to increase tension and stress in response to traffic congestion image stimuli.