• Sleep Medicine and Psychophysiology
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• v.1 no.1
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• pp.68-75
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• 1994

In order to examine the effects of circadian rhythm in subjective alertness on the occurrence of traffic accidents, the authors investigated the occurrence rate of traffic accidents adjusted to traffic volume in Seoul and the relative rate of fatal accidents versus total traffic accidents in Korea at different times of day in 1991. We analyzed these data in relation with the circadian rhythm in subjective alertness. The results were as follows. Both the occurrence rate of traffic accidents adjusted to traffic volume and the relative rate of fatal accidents versus total traffic accidents were the highest at 3-4 a.m., known as the time period of the lowest subjective alertness. They were negatively correlated with subjective alertness (p<0.05, p<0.001). In conclusion, it is suggested that the circadian rhythm of subjective alertness should have a significant effect on the occurrence of traffic accidents despite many confounding factors such as driving environments.

• Journal of Technologic Dentistry
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• v.31 no.3
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• pp.67-85
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• 2009

This study aims to provide the research for dental technician's stress prevention and management with basic materials by understanding dental technician's psychosocial stress level and examining relevant factors. The subject of this study is 255 dental technologists who work mainly in Seoul Gyeonggi district for a month of April of 2009 and I conducted cross-sectional study through self administered survey. The contents of survey include general feature, occupational feature, health behavior feature. I used Karasek's Job Content Questionnaire, JCQ and Psychosocial well-being index, PWI-SF as means of measurement. To compare the level of dental technician's psychosocial stress, I conducted t-test and ANOVA and I measured the factors that are related with psychosocial stress symptom with step by step multiple regressive analysis. According to the result of Cronbach's a value which is yielded to verify the reliability of means of measurement, the reliability of concept is sufficient. The detailed result of this study is as follows. 1. According to the result of analyzing the stress symptom in accordance with general feature and occupational feature, those dental technologists who are older and not married, graduate from junior college, have lower position, work at university hospital or general hospital show lower stress(p<0.05). There is no difference in the level of psychosocial stress with regard to duty related feature, period of service, daily average working hours, monthly average pay. 2. With regard to health behavior feature, those dental technologists who control weight better and have meal more regularly show lower stress(p<0.05). Those dental technicians who smoke, drink liquid and take a suitable sleep show low stress but the difference does not have significance statistically. 3. With regard to the factors of stress in the workplace, those dental technicians who have lower duty related requirement, have higher duty related control ability, have higher social support, have less instability of employment and have less workload and physical burden show lower stress(p<0.05). 4. According to the result of analyzing the factors that influence dental technologist's stress symptom, social support has the most enormous influence on stress symptom. Unstable employment, regular exercise, regular eating, daily average sleeping hours and technological capacity are also important in this order. According to the result of this study, those dental technicians who have higher social support, less instability of employment, do exercise more regularly, take enough sleep more soundly and have higher technological capacity show lower psychosocial stress symptom. Therefore, to adjust appropriately the dental technician's stress and properly maintain and improve the dental technician's mental health, effective management plan that enables dental technicians to maintain smooth human relationships for dental technicians should be sought. In addition, heath education and health management for dental technicians should be given more thoroughly so that they can establish desirable health behavior in daily life.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.48 no.6
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• pp.88-96
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• 2011

Underwater acoustic communication is applicable in various areas, such as ocean data collection, undersea exploration and development, tactical surveillance, etc. Thus, robot control system construction used for underwater-robot like AUV or ROV is essential in these areas. In this paper, we propose the Message Merging MAC($M^2$-MAC) protocol, which is suitable for real time robot control system, considering energy efficiency in important parts of underwater acoustic sensor network constitution. In this proposed MAC protocol, gateway node receives the data from robot nodes according to the time slots that were allotted previously. And messages delivered from base-station are generated to one MAC frame by buffering process. Finally, generated MAC frames are broadcasted to all robot nodes in the cluster. Our suggested MAC protocol can also be hybrid MAC protocol, which is successful blend of contention based and contention-free based protocol through relevant procedure with Maintenance&Sleep (M&S) period, when new nodes join and leave as an orphan. We propose mathematical analysis model concerned about End-to-End delay and energy consumption, which is important factor in constructing real-time robot control system. We also verify the excellence of performance according to comparison of existing MAC protocols with our scheme.

• Korean Journal of Agricultural Science
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• v.11 no.2
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• pp.218-222
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• 1984

The present study was carried out to investigate the behaviour of parturition, nursing and sleep with a total of 40 sows and 420 piglets during 28 days from July 6 to August 3, 1984. The results obtained in this study were as follows: 1. About half number of sows employed were recumbent and lay on their right or left side throughout the process of delivery, but the rest changed their lying sides during the delivery, about 65% of piglets born were presented anteriorly. During nursing 51.3% of sows were recumbent and lay on their left side. 2. The entire farrowing process normally lasted 4 hr. Piglets were expelled at an average rate of one for every 19.3mim. 3. The first suckling attempt was observed at about 24.3min after birth. "Teat order" were established within 32hr after birth. 4. The duration and time of nursing were 35.8 second and 24.6 times/day, respectively, in the first day of piglet life. However, they tended to shorten with the advance of lactation. The intervals between nursings were 58.5 min. in the first day of piglet life, but it tended to lengthen with the advance of lactation. 5. The sows were awake for 31.7%. drowsy for 16.7%, and asleep for 51.6% of the 24hr period a day.

• Journal of the korean academy of Pediatric Dentistry
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• v.29 no.4
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• pp.489-497
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• 2002

The purpose of this study was to compare the clinical sedation effect of chloral hydrate and hydroxyzine combination with and without nitrous oxide/oxygen inhalation when young children were sedated for dental treatment. The uncooperative 20 children aged, 21 to 47 months of age(ASA Class I), participated in the study. The author examined 20 children(male 12, female 8). Each patient was assigned to receive chloral hydrate(50mg/kg) and hydroxyzine(25mg). Next appointment, each patient was assigned to receive $N_2O-O_2$, choral hydrate and hydroxyzine. Sleep, crying, movement, and overall behavior response were evaluated, and the sedative effects were evaluated by Houpt's rating scale. Pulse rate and peripheral oxygen saturation were also measured for monitoring the sedated patients during treatment period by pulse oximeter. The result were as follows : 1. In the evaluation of sleep scores, crying scores, and movement scores, chloral $hydrate/hydroxyzine/N_2O-O_2$ combination group was significantly rated high(p<0.05). 2. In the evaluation of overall behavior scores, chloral hydrate/hydroxyzine/$N_2O-O_2$ combination group was significantly rated high(p<0.05). 3. In the evaluation of overall behavior evaluation scores(by Houpt), 93.3% in chloral $hydrate/hydroxyzine/N_2O-O_2$ combination group and 63.3% in chloral hydrate/hydroxyzine combination group were rated "good" or "very good". 4. There was no adverse side effect(i.e. respiratory depression) in both group.

• Journal of Korean Academy of Nursing
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• v.2 no.1
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• pp.49-61
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• 1971

The purpose of this study is to observe the administering of analgesics and sedatives to cases of surgery, the influence of the patients'situational variables on the use of these drugs, and the required number of recovery days in relation to the patients'situational variables and general conditions. Fifty patients in the age range of 15 through 65 who had undergone general surgery at Seoul national University Hospital. Woo Sok University Hospital and Koryo Hospital between May and August of 1971 were chosen for this study. They were observed with regard to the frequency of postoperative uses of analgesics and sedatives age, the required period of recovery in comparison with the situational variables of patients such as sex, age, marital status, the type and duration of anesthesia, experience of previous operation, history of other diseases, preoperative period of hospitalizations and the general conditions of patients such as sleep, stomach condition, bowel condition, urination, interest in surroundings, strength and energy, self-assistance and appetite. The study results were reviewed in a statistical method to obtain the following findings: 1. There was a significant decrease in the frequency of analgesic uses according to the number of days passed after operation. 2. The mean postoperative recovery days were 5.31 days and mote than half of the patients have never used analgesics until recovery. 3. There was a significant decrease in the frequency of sedative uses according to the number of days passed after operation. 4. The rank-order correlation between the frequency of analgesic use and that of sedative use following surgery observes in relation to the number of postoperative days was a low and negative one. 5. All of the patients except one hate used sedatives only once a day for the whole recovery period. 6. The longer they stayed in the hospital before surgery, the less have they used analgesics after surgery. 7. There were significant differences in use of analgesics after surgery by age groups; the 25-44 age group used more analgesics than the 15-24 and 45-65 age groups. 8. There were no significant differences in use of analgesics after surgery by all situational variables except the number of days of hospitalization and age. 9. The longer they stayed in the hospital before surgery, the earlier have they recovered from the surgery. 10. There were no significant differences in the number of required recovery days by all situational variables except the length of preoperative hospitalization. 11. There were no significant differences in the number of required postoperative recordedly days by the general conditions of patients.

• The Journal of Korean Obstetrics and Gynecology
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• v.26 no.1
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• pp.69-81
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• 2013

Purpose: The aim of this study is to determine associated factors affecting the utilization of Medical Care for an overactive bladder. Methods: Total 114 women with overactive bladder participated in this study. Patients were categorized in two groups, the patients with treatment experiences for an overactive bladder(n=40) and without treatment experiences for an overactive bladder(n=74). Patients completed Overactive Bladder Severity Score, Beck Depression Inventory, King's Health Questionnaire, and questionnaires on treatment experience. The results were analysed using SPSS for Windows 12.0k. All statistical tests were two-sided with a p-value < 0.05 being significant. Results: Patients with treatment experience had a greater score on KHQ, OABSS, BDI and had longer symptom duration period than those without treatment experience. And only Impact of Life(P=0.004), Role Limitation(P=0.004), Social Limitation(P=0.007), Emotion(P=0.035), Sleep/Energy(P=0.001), Incontinence Severity Measures(P=0.012) among KHQ domains were statistically significant difference between two groups. Conclusions: The most influencing factor associated with utilization of Medical Service in overactive bladder is the impact of the patient's quality of life.

• Journal of Service Research and Studies
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• v.6 no.2
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• pp.51-64
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• 2016

This study is to find a service that improves the subjective happiness of cancer patients that receive radiation therapy. One hundred and one cancer patients undergoing radiation therapy were enrolled in the survey to verify the self-consciousness and symptom distress that could affect the subjective happiness. Independent t-test, one-way analysis of variance, and Pearson correlation were conducted with the SPSS 20.0 program. Symptom distress of cancer patients undergoing radiation therapy showed highest in the order of fatigue, appearance changes, dizziness, loss of appetite, and sleep disorders. And lower symptom distress, higher private self-consciousness were significantly correlated with higher subjective happiness among patients receiving radiation therapy for cancer. Study findings reflect the necessity of an integrative approach combining physical, psychological and emotional interventions during a radiotherapy period. For this cause, it would be necessary to supplement previously existing service programs and organize a patient-friendly system that could affiliate regional cancer centers or Public health centers with the hospitals in which the patients are being treated.

• Journal of Digital Convergence
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• v.10 no.10
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• pp.405-413
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• 2012

This study of male workers of small manufacturing companies with 50 or less determine the level of job stress and Investigated the relevance of these demographic characteristics, health behaviors, and job-related characteristics. The study subjects were 856 male workers, health checkups and screening agencies are engaged in small manufacturing companies with 50 or less people. Data collection period from April 1, 2010 until June 30, during the self - administered questionnaire through a survey was done. The Study results, several demographic characteristics, health-related behavioral characteristics and job-related characteristics of the variables and job stress is surveyed, there was a significant association. Drinking status, occupation, hours of sleep, leisure activities, whether working position, duration, number of hours per week, for inpatient and outpatient experience, whether in the workplace satisfaction, especially those affecting the job stress factors, such as has been pointed out, Therefore, in order to reduce job stress, health-related behaviors and the work environment, and efforts to improve the content of the job.

• The Journal of Korean Obstetrics and Gynecology
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• v.19 no.3
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• pp.231-245
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• 2006

Purpose : To investigate and compare the characteristics of menstruation in the shift workers and the day workers, and present guidelines for health promotion of the shift-working women. Methods : Questionnaires including general health condition and QSCC II were distributed to shift-working women and day-working women in one university hospital in Gyeonggi-do and 36 questionnaires of shift-working women and 33 of day-working women were analyzed. Results : Day workers were about 5 years older than shift workers on average. There was more irregularity of menstrual cycle and period in day-working group but it is thought to incorrect because of the age problem. There were more women who have dysmenorrhea in day-working group, but the proportion of dysmenorrhea which continues more than 72 hours -which is very suggestive of secondary dysmenorrhea- was higher in shift-working group. Average VAS of dysmenorrhea was nearly the same in two groups. The life of shift-working group was lesser satisfactory than that of day-working group. There were more sleep disturbances in the shift-working group. Sasang constitution was analyzed in both group using QSCC II, and Taeumin were more in shift-working group. Conclusion : As the number of shift-working women increases, needs for oriental medical treatments would increase because it is more natural and lesser invasive managements which women are very interested in. So it is thought to be necessary to understand health problems of shift-working women, and prepare guidelines for managements and treatments to promote the health of shift-working women.