• The Journal of Internal Korean Medicine
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• v.25 no.3
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• pp.492-496
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• 2004

This research was carried out to examine the correlation between the patients of functional dyspepsia and four constitution (Sasang Constitution). This research examined the correlation of functional dyspepsia versus Sasang Constitution, chronic fatigue, and mental stress in 100 cases of functional dyspepsia. No significant correlation was witnessed between average duration of dyspepsia and gender, and smorking. There was tendency of increased duration of indigestion in relation with length of chronic fatigue and the degree of mental stress. Significant difference was found between the patients with indigestion and Sasang Constitution types. Soeumin among the patients with indigestion were numerous and it was significantly different with normal people. Significant correlation was found between the period of indigestion and chronic fatigue and the degree of mental stress. Significant difference was found between the patients with indigestion and Sasang Constitution types.

• Journal of Korean Academy of Nursing
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• v.36 no.6
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• pp.925-932
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• 2006

Purpose: The purpose of this study was to identify the relationship between depression, perceived stress, fatigue and anger in clinical nurses. Method: A descriptive survey was conducted using a convenient sample. Data was collected by questionnaires from four hundred clinical nurses who worked at a university hospital. Radloff's CES-D for depression, Cohen, Kamarck & Mermelstein's Perceived Stress Scale, VAS for Fatigue, and Spielberger's STAXI for anger were used. The data was analyzed using the pearson correlation coefficient, students' t-test, ANOVA, and stepwise multiple regression with SPSS/WIN 12.0. Result: The depression of clinical nurses showed a significantly positive correlation to perceived stress(r=.360, p=.000), mental fatigue(r=.471, p=.000), physical fatigue(r=.350, p=.000), trait anger(r=.370, p=.000), anger-in expression(r=.231, p=.000), and anger-control expression(r=.120, p=.016). There was a negative correlation between depression and age(r=-.146, p=.003). The mean score of depression of nurses, 26, was a very high score and 40.8% of clinical nurses were included in a depression group. The main significant predictors influencing depression of clinical nurses were mental fatigue, trail anger, perceived stress, anger-in expression, and state anger, which explained about 32.7%. Conclusion: These results indicate that clinical nurses with a high degree of perceived stress, mental fatigue and anger-in expression are likely to be depressed.

• Journal of Technologic Dentistry
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• v.11 no.1
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• pp.47-63
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• 1989

The study was made to clarify the degree of fatigue of dental technicians in service at the general &local hospital or the dental laboratories in the large cith of korea. The objectives of this study were 235 dental technicians who replied the questionaire which was sent by postal service out of 600 dental technicians selected by random sampling among the workers of the each dental laboratory. The instruments used in this study was the same one as developed by Industry Fatigue committee of Japan Industry Hygiene Association. This instrument was included total 30 items which is consisted of 10 perceived symptoms of fatigue in physical, mental and neuro-sensory dimension respectably. Reliability was tasted with the data of objectives, in which value of Cronbach's $\alpha$ was 9457. The following results were obtained. 1. It was revealed that the influencing demographic variables on the perceived symptoms of fatigue of dental technicians were sex, age, marital status, educational background, job carrier, working part, working hour and commuting hour. The shorted the age or job carrier, thge higher dearee of the perceived symptoms of fatigue. The longer working hours of commuting hours, the higher degree of the perceived symptoms of fatigue. The degree of the perceived symptoms of fatigue in females, unmarried person, the one with higher educational background, workers except orthodontic appliances and poorcelain contouring were higher than the other group. 2. The higher degree of the rest & leisure condition, the lower degree of the physical, mental and neuro-sensory perceived symptoms. 3. The higher degree of environmental condition of the working, the lower degree of the physical, mental and neurosensory perceived symptoms.

• Korean Journal of Occupational Health Nursing
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• v.6 no.1
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• pp.5-13
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• 1997

For the purpose of investigating the subjective symptom of industrial fatigue, a questionnaire survey was carried out on 282 labor workers and 189 managerial workers who were employed at the manufacture of electronic products in two small scale industries. Checklist of industrial fatigue was composed of physical symptoms(10 items), mental symptoms(10 items), and sensory neurotic symptoms(10 items). The results were as follows : 1. Complain rate of fatigue was the highest in "eye strain" of physical symptom, "feel anxious about things" of mental symptom, and "feel stiffness in the neck or the shoulders" of sensory neurotic symptom in labor workers and managerial workers. 2. Managerial workers demonstrated II dominant type (mental or night work type), while labor workers demonstrated I dominant type of fatigue (general type). 3. Mean weighted score of fatigue complaints in labor workers (23.16) was significantly higher than that in managerial workers (20.34). 4. Mean weighted scores of fatigue complaints in male, 5~9 years of work duration, married, 4~5 hours of sleeping time, graduation of high school and college, and large of workload were significantly higher in labor workers than in managerial workers. 5. In poor work condition with temperature, ventilation, illumination and noise, the average weighted score was significantly higher in labor workers than in managerial workers.

• Journal of the Korean Society of Safety
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• v.21 no.2 s.74
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• pp.114-120
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• 2006

Inspection works are mainly carried out with the help of human sensory organs and are relatively simple and repetitive, so that the workers easily become to feel fatigue and monotony, and their mental activity levels attenuate. Consequently, during the work time, it is natural that various lighting conditions around the workplaces may have in-fluence on work performance. This study aimed to analyze cortical fatigue of inspection workers. Thus, an inspection work was simulated on a computer monitor under various lighting conditions, and CFF, EEG, EOG, and HRV were analyzed. According to the results, fatigue symptoms turned up about $60{\sim}90$ minutes after the onset of the work. The work performance also decreased when the fatigue symptoms due to lighting conditions turned up. The variations of fatigue and work performance were affected by illuminators, illumination levels, or interaction of those two factors. The spiral fluorescent lamp seemed improper to the inspection work, because the work performance under that condition was lower than under any other illuminators.

• Proceedings of the Society of Korea Industrial and System Engineering Conference
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• 2002.05a
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• pp.69-78
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• 2002

This paper examines the effects on mental fatigue of changes in the intensity of physical activity. A treadmill-equipped instrument and perception tester were used to attain several levels of physical activity In this paper, In order to determine the individual levels of physical activity of subjects, Borg-RPE scale, Heart Rate(HR) and Respiratory Quotient(RQ) were used. Also, an addition test in whole-body activity on treadmill-equipped instrument as an indicator of mental fatigue were performed. In the above experiments, the scores obtained in addition test administered before and after physical activity at each intensity level used. Restricted within the limits of this paper, the results of these tests showed that mental fatigue decreased after physical activity.

• Journal of the Korean Society of Safety
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• v.16 no.4
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• pp.182-187
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• 2001

This paper examines the effects on human reaction time and mental fatigue of changes in the intensity of physical activity. A treadmill-equipped instrument and perception tester were used to attain several levels of physical activity. In this paper, in order to determine the individual levels of physical activity of subjects, Borg-RPE scale, Heart Rate(HR) and Respiratory Quotient(RQ) were used. Also, a reaction test in whole-body activity on treadmill-equipped instrument and an addition test as an indicator of mental fatigue were performed. In the above experiments, the scores obtained in addition test administered before and after Physical activity at each intensity level used. Restricted within the limits of this paper, the results of these tests showed that mental fatigue decreased after physical activity.

• The Journal of Korean Society for School & Community Health Education
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• v.19 no.1
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• pp.99-109
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• 2018

Objectives: The study was conducted to understand job stress and fatigue conditions by dividing nurses in a polyclinic-level public medical institution, Seoul with more than 600 beds into ward nurses and non-ward nurses and to comprehend sub-areas of job stress that affect fatigue. Methods: A survey was conducted from August 18 2014 to September 12 2014, so 216 cases were analyzed by using PASW statistics 18.0. Results: Job stress of ward nurses is significantly high in the psychological burden of nursing service area and medical limit. Fatigue of ward nurses is also higher. As a result of multiple Linear regression, nursing service area affects fatigue of ward nurses and there is no significant influence factors in non-ward nurses. Conclusion: Therefore, mental health education and interest of hospital in nursing service area are more needed for ward nurses with high job stress and fatigue among nurses.

• Journal of Digital Convergence
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• v.19 no.10
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• pp.295-301
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• 2021

Individual mental fatigue not only reduces cognitive ability and work performance, but also becomes a major factor in large and small accidents occurring in daily life. In this paper, a CNN model for EEG-based mental fatigue discrimination was proposed. To this end, EEG in the resting state and task state were collected and applied to the proposed CNN model, and then the model performance was analyzed. All subjects who participated in the experiment were right-handed male students attending university, with and average age of 25.5 years. Spectral analysis was performed on the measured EEG in each state, and the performance of the CNN model was compared and analyzed using the raw EEG, absolute power, and relative power as input data of the CNN model. As a result, the relative power of the occipital lobe position in the alpha band showed the best performance. The model accuracy is 85.6% for training data, 78.5% for validation, and 95.7% for test data. The proposed model can be applied to the development of an automated system for mental fatigue detection.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.12
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• pp.2357-2364
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• 2017

Recently, smart wearable devices for monitoring health status have been utilized as interest in health care has increased. In this paper, we developed a fatigue measurement system that works with smart wearable devices. Unlike physical fatigue that is restored when you take enough rest, mental fatigue can decrease the efficiency or concentration of work, so you can monitor your mental health status through measurements. This system provides the function to transmit the measured data from the smart wearable device to the smartphone and to calculate the mental fatigue. A fatigue index was developed to measure fatigue and expressed as a number from 1 to 5. In addition, the results of the fatigue calculation and the survey were compared with the results of the independent sample t-test. Therefore, this system will be used to help users manage their health efficiently.