• Safety and Health at Work
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• 제10권1호
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• pp.75-79
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• 2019

Background: Since the presence of a co-driver can be considered as a companion, partner, or friend for a driver through eliminating driver's loneliness, it plays a significant role in health and safety of drivers. The objective of this study was to investigate the effect of co-drivers on depression and occupational stress on male truck drivers. Methods: This study was an interventional case-control study. Seventy truck drivers were selected and divided into two groups: case (33 truck drivers with co-drivers) and control (37 truck drivers without codrivers). Two Goldberg depression inventories (for evaluating driver's depression) and the Karasek job content questionnaire (for evaluating driver's job stress) were used to collect data which were completed by interview. Results: The results showed that job content values for the case group were higher in all dimensions except job nature. The comparison of the percentages showed significant difference between two groups. Depression rate in drivers with co-driver is truly less than depression rate in drivers without co-driver. There was significant positive relationship between dimensions of job content and depression rate. Conclusion: According to the results of this study, it can be claimed that a co-driver decreases stress and loneliness of drivers, as well as increases work performance and job satisfaction, and, in turn, leads to a decrease in job-related depression.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.646-649
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• 2007

Although the up-to-date(high) technique is developing and automating in many fields, the center of the all fields is closely connected with the human resource. Also, the railway driver is required to have both high technique and high level of mental work. Therefore, this research will grasp the types of the railway driver groups through railway driver's task stress analyze(JCQ and Job Content Questionnaire), and then analyze the human errors which the types can occur. Finally, this research will propose the way to reduce the human errors.

• 감성과학
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• 제13권1호
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• pp.61-68
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• 2010

본 연구에서는 Healey 등(2005)의 데이터를 활용하여 스트레스 정도가 단시간에 변하는 운전상황에서 운전자의 심박변이도 분석을 통해 스트레스 정도에 대한 추정이 가능한지를 예비적으로 평가해 보았다. 단시간에 스트레스 정도가 변하는 운전의 경우 심박변이도 변화 양상은 기존 문헌에 나타난 장거리 운전의 양상과 다르며, meanRR, sdRR, HF, LF/HF, LFnorm, HFnorm의 6가지 심박변이도 파라미터가 스트레스 추정에 유의한 변수로 확인되었다. 정상인 운전자 5명에 대해 6가지 파라미터를 입력변수로, 운전 구간에 따라 변하는 스트레스 정도를 출력변수로 하여 개인별 선형회귀 모델($R^2=0.8604{\pm}0.0959$)을 도출하였으며, 이 선형회귀 모델의 적합성을 평가하기 위하여 심박변이도 데이터를 5분 길이의 16개 세그먼트로 나눈 뒤 실제 스트레스 정도와 추정된 스트레스 정도를 비교해 보았다. 그 결과 일부 세그먼트에서 부정확한 추정 결과가 관찰되기도 하였으나, 실제 스트레스 변화 패턴과 예측된 스트레스 변화 패턴 사이에 높은 상관성이 확인되었다($r=0.8560{\pm}0.0619$). 향후 운전자 구속을 최소화하면서 측정 가능한 심박변이도 분석 시스템을 개발하고, 이를 Healey 등의 연구에서와 유사한 운전 프로토콜을 통해 다수의 피험자에게 적용함으로써 본 연구결과가 유효한지 검증할 계획이다.

• 한국심리학회지 : 문화 및 사회문제
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• 제15권2호
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• pp.319-338
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• 2009

본 연구는 차량 운전 중 운전자가 원하는 속도만큼 속도를 내지 못하는 상황이 운전 스트레스에 어떠한 영향을 미치는지를 알아보고자 실시되었다. 운전자의 속도에 대한 욕구좌절은 희망 주행속도와 실제 주행속도의 차이로 구성개념화 되었다. 연구결과 4가지 도로조건(고속도로, 국도도로, 시내도로, 시골도로) 모두에서 운전자들의 희망 주행속도는 실제 주행속도보다 높게 나타났다. 4가지 도로조건(고속도로, 국도도로, 시내도로, 시골도로)을 종합한 평균 속도 욕구좌절은 운전 스트레스 척도 모든 점수(전체 DSQ점수, 전체 DSI점수, 전체 DSF점수, 진행장애 요인, 운전환경 요인, 사고단속 요인, 교통법규 요인, 시간압력 요인)들에 정적으로 유의한 영향을 미치는 것으로 나타났다. 특히, 속도 욕구좌절이 높아짐에 따라 운전 스트레스 척도의 강도 점수와 진행장애 요인, 시간압력 요인 등이 다른 운전 스트레스 척도 점수들보다 더 큰 영향을 받는 것으로 나타났다. 평균 속도 욕구좌절을 백분위 점수에 따라 4가지 수준으로 구분하여 운전 스트레스 척도 점수들과 과속단속 그리고 가해·피해 교통사고 경험 차이를 분석하였다. 분석결과 속도 욕구좌절이 높은 운전자들은 속도 욕구좌절이 낮은 운전자들보다 운전 스트레스 척도의 점수들도 유의하게 높은 것으로 나타났다. 하지만, 속도 욕구좌절 정도에 따른 과속단속 경험이나 가해·피해사고 경험은 차이가 나타나지 않았다.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2006년도 춘계학술대회 논문집
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• pp.125-130
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• 2006

In this study, tests of brain waves were carried out to investigate the driver's physiological characteristics by the change of the headlight. The participants were 20 men in their 20s and twenty-three different conditions in combinations of waveform of light, voltage, and alteration time were used. The measurement of the brain waves was performed by internationally standardized 10-20 method using LXE3232-RF. The results were analyzed by Power Spectrum Analysis using alpha-, and beta-wave and by the analysis of different brain domains using Brain wave Map. The results were as follows. 1. From the results of the Brain wave Map analysis, it was suggested that A waveform increases mental stress and B waveform affects mental and visual stress. The longer the stimulation time, the more stress level was detected. 2 The voltage alteration time of B waveform should be kept less than 1500msec, and the voltage should not fall below 11.5V.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회/대한산업공학회 2005년도 춘계공동학술대회 발표논문
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• pp.554-559
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• 2005

It seems to be dangerous to use a cellular phone while driving since it increases driver's mental stress and makes driver's reaction time slow. This study is to investigate driver's psycho-physiological responses on mobile telephoning while driving. Among the three experimental factors (mobile-phone types, message IODs over mobile-phone, road types), only the message IODs over mobile-phone changed R-R intervals of electrocardiograph significantly. This result suggests that the regulations on the mobile telephoning while driving be changed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.166-170
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• 2003

This paper presents the TTFC(Two Transistor Forward Converter) using Synchronous Rectifier of Compulsory Control-driver. The two transistor forward circuit is used to decrease voltage stress of primary side and the synchronous rectifier is used to reduce current stress of secondary side. Previous synchronous rectifier's MOSFET of TTFC have long dead time This paper presents synchronous rectifier of compulsory control-driver for minimized dead time. This paper compared with diode rectifier, self-driven synchronous rectifier and compulsory control-driver synchronous rectifier of TTFC. The principle of operation, feature and design considerations are illustrated and verified through the experiment with a 200W 100kHz MOSFET based experimental circuit.

• 전기학회논문지P
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• 제67권2호
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• pp.100-105
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• 2018

In this paper, we determined the driver's stress and fatigue level through physiological signals of a driver in the connected car environment, accordingly designing and implementing the architecture of the connected cars' platforms needed to provide services to make the driving environments comfortable and reduce the driver's fatigue level. It includes a gateway between AVN and ECU for the vehicle control, a framework for native applications and web applications based on AVN, and a sensing device and an emotion estimation engine for application services. This paper will provide the element technologies for the connected car-based convergence services and their implementation methods, and reference models for the service design.

• Safety and Health at Work
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• 제2권2호
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• pp.169-175
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• 2011

Objectives: The questionnaire of occupational stress index (OSI) has been popular in the workplace, and it has been tailored for bus drivers in Taiwan. Nevertheless, its outcomes for participants are based on self-evaluations, thus validation by their physiological stress biomarker is warranted and this is the main goal of this study. Methods: A cross-sectional study of sixty-three city bus drivers and fifty-four supporting staffs for comparison was conducted. Questionnaire surveys, 24-hour urine cortisol testing, and blood draws for dehydroepiandrosterone-sulfate (DHEA-S) testing were performed. The measured concentrations of these biological measures were logarithmically transformed before the statistical analysis where various scores of stressor factors, moderators, and stress effects of each OSI domain were analyzed by applying multiple linear regression models. Results: For drivers, the elevated 24-hour urine cortisol level was associated with a worker's relationship with their supervisor and any life change events in the most recent 3 months. The DHEA-S level was higher in drivers of younger age as well as drivers with more concerns relating to their salary and bonuses. Non-drivers showed no association between any stressor or satisfaction and urine cortisol and blood DHEA-S levels. Conclusion: Measurements of biomarkers may offer additional stress evaluations with OSI questionnaires for bus drivers. Increased DHEA-S and cortisol levels may result from stressors like income security. Prevention efforts towards occupational stress and life events and health promotional efforts for aged driver were important anti-stress remedies.

• 한국정보통신학회논문지
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• 제14권5호
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• pp.1303-1310
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• 2010

최근 운전자의 건강상태 모니터링 및 졸음운전 방지를 위한 자동차용 부품관련 센서개발 및 시스템 연구들이 국내외에서 활발히 진행되고 있다. 본 논문은 이러한 운전자의 건강 상태 및 졸음운전을 점검하기 위해 체스트벨트 심전도 (ECG)와 손목착용형 산소포화도 (SpO2) 센서를 제작하여 생체신호를 측정하였으며, 측정된 심전도, 산소 포화도, 그리고 심장박동수 신호는 무선센서네트워크를 통해 수집, 전송 및 모니터링 등의 처리를 가능하게 하여 운전자에게 안전운행을 위한 정보를 제공하도록 하였다. 원격지인 서버 PC와 연결된 베이스스테이션으로 수집된 심전도와 용적맥파 신호에서 HRV (Heart Rate Variability, 심박변이도) 신호를 검출하였으며, 검출된 HRV 신호를 시간 영역과 주파수 영역에서의 해석을 통하여 운전자의 스트레스 지수 및 졸음 상태의 실시간 모니터링 및 졸음상태의 운전자에게 주의를 제공하기 위하여 알람을 제공하는 형태의 지능형 모니터링 시스템을 구현하였다.