• Journal of Family Resource Management and Policy Review
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• v.21 no.3
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• pp.141-159
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• 2017

The main purpose of this study is to investigate factors that influence sleep duration and sleep time poverty in terms of family characteristics, child characteristics, and time use. A series of data analyses were conducted on children's time use in two-parent families based on the 2013 Korean Children and Youth Panel Survey. One major finding is that children's sleep duration and the probability of having a sleep time poverty are related to their mothers' job classifications. The factors influencing the duration of sleep time and the sleep time poverty are similar in terms of family characteristics and children's time use. The mother's job classification, family income, number of younger siblings, number of older siblings, children's private tutoring hours, computer game hours, and TV hours are statistically significant factors affecting the duration of sleep time and the probability of having a sleep time poverty. However, the factor with greatest influence on sleep time duration is private tutoring hours and the factor most affecting sleep time poverty is computer game hours. The mother's job classification is a relatively powerful determinant for predicting her children's sleep duration and sleep time poverty.

• The Journal of the Korea Contents Association
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• v.15 no.12
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• pp.314-325
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• 2015

This study examines the impact of sleep duration on Korean adolescents' suicidal impulse. A gender-based analysis was conducted using binary logistic regression method. The major findings are as follows. First, weekday sleep duration had a significant effect only on male adolescents. Male adolescents who sleep less than seven hours on a weekday are likely to experience suicidal impulse by 1.9 times higher than the others. This effect remained significant even when other relevant variables were controlled. On the other hand, female adolescents who have less than seven hours of sleep on a weekday have about 1.3 times higher chances to experience suicidal impulse. However, this effect became insignificant when other variables such as stress were controlled. Meanwhile, weekend sleep duration did not have any significant effect on both male and female adolescents. By demonstrating the different effects between weekday/weekend sleep duration and male/female adolescents, this study supports the claim that it is necessary to take a social approach in studying sleep duration.

• Journal of the Korean Data and Information Science Society
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• v.27 no.3
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• pp.773-789
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• 2016

This study was conducted to identify the sleep patterns and influencing factors of hospitalized elderly in a long-term care hospital. The sleep patterns of 142 subjects were recorded using Sleep Charts. The average sleep time of subjects was 10.7 hours a day (3.9 hours in daytime and 6.8 hours in nighttime). Sleep regularity among participants were 71.7% in all day (58.1% in day time and 80.5% in night time). The presence of dementia patients in the room (PDPR) has been identified to be a statistically significant predictor of all day sleep, and pain, PDPR, and physical function have been found to be a significant predictors of sleep regularity in all day among subjects. It suggested that elderly patients in a long-term care hospital do not slept well during night, which leads to increase in daytime sleep and decrease the quality of their sleep. Therefore, an intervention program should be developed to promote the quality of sleep among hospitalized elderly.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10c
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• pp.715-717
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• 2004

최근 무선 통신 기술과 전자 기술의 진보로 지능형 센서(Smart Sensor)를 이용한 무선 센서 네트워크 구축이 가능해졌고, 이러한 센서 네트워크는 최근 유비쿼터스 컴퓨팅과 Ad-Hoc 네트워크에서 많이 연구되고 있는 새로운 이슈이다. 최근 센서관련 논문에서는 각 센서 노드의 제한된 에너지를 효율적으로 사용하기 위해 데이터 전송이 없을 경우 노드의 통신 모듈을 Sleep 시킴으로써 에너지를 절약 한다. 이를 위해서 모든 센서 노드들은 동기화를 맞추어 listen과 sleep를 주기적으로 반복해야 한다. 이러한 프로토콜들에서 발생하는 가장 큰 문제는 에너지 효율성과 데이터 전송 지연간의 반비례 관계이다. 에너지의 효율성을 위해 Sleep 시간을 길게 할수록, Sleep 시간에서 발생한 데이터의 지연 시간도 길어지게 되므로, 데이터의 지연을 고려하여 sleep 시간을 적당히 조정해야 필요가 있다. 본 논문에서는 에너지 효율성을 위해 listen/sleep 주기를 사용하면서도 데이터 지연을 최소화 할 수 있는 효율적 sleep 시간에 대해 논의 해 보려 한다.

• Journal of Nutrition and Health
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• v.55 no.6
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• pp.656-669
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• 2022

Purpose: This study investigates the relationship between sleep duration, sleep quality, time use, and dietary quality of adolescents. Methods: A cross-sectional study was conducted, enrolling 423 high school students (112 male and 311 female students) in Chungnam using a questionnaire comprising general characteristics, sleep status, use of time, and Nutrition Quotient for Korean Adolescents (NQ-A). Results: On weekdays, male students reported getting 6.6 hours of sleep, which was significantly higher than the 5.8 hours reported by female students. The sleep quality score between male and female students was not significantly different on weekdays and weekends. Comparing the students categorized as getting 6 hours of sleep duration on weekdays and 8 hours on weekends, a significantly higher total NQ-A score was obtained for the long sleep duration group of female students on weekdays. In male students who reported increased screen time on weekdays and study time on weekends, there was a greater frequency of short sleep duration. Our data also revealed that the longer the sleep duration higher the NQ-A score. In addition, higher NQ-A scores were determined with shorter screen time and more prolonged exercise time. Conclusion: Our results suggest that intense study time and excessive use of smartphones have a negative effect on sleep in high school students. In addition, poor sleep quality and lack of sleep are likely to affect eating habits and nutritional status. Therefore, there is a need to provide nutritional education to adolescents imparting knowledge that associates desirable sleep habits and the correct use of time.

• 재활복지
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• v.21 no.4
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• pp.195-208
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• 2017

This study aimed to investigate the effect of the participation in rehabilitation horseback riding program on the sleep, and to provide the basic data by analyzing the sleep of individuals with autism spectrum disorders. This study subjects consisted of 10 individuals with autism spectrum disorders residing in a residential care facility for the people with intellectual disabilities. They participated in the 12 weeks rehabilitation horseback riding program regularly. To investigate the effects of participating this program on sleep, subjects' sleep time, wake-up time, total sleep time and wake-up frequency during sleep were measured. Descriptive statistics and Friedman test were conducted to analyze the change the sleep. As a reulst of anlysis, it was found that the sleep time came earlier, the total sleep time increased, and the wake-up frequency during sleep reduced. Therefore, the rehabilitation horseback riding program participation was shown to have a positive effect on the subjects' sleep. Since the application of this program can act as a positive factor in the sleep of the participations, it is expected to be used as an in-facility program for the residents with autism spectrum disorders.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.5
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• pp.372-383
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• 2020

This study analyzed the influence of Korean adults sleep time on psychological symptoms, suicidal ideation and attempts considering gender differences. The data was collected from the community health survey in 2017 with 228,381 people. When categorizing them into male and female, logistic regression analysis was conducted and the main analysis results are as follows. First, there are more women with shorter or longer sleep time than men. Second, in case of shorter sleep time (5 hours and less), stress, depression, and the suicidal ideation rates were high while suicidal attempts were higher in case of sleep greater than 9 hours and more. Third, in case of men, based on 6~8 hours of sleep time, people with shorter sleep time showed higher stress (1.84 times), depression (1.98), suicidal ideation (1.88), and attempts (2.38). People with 9 hours and more sleep showed greater depression (1.79), suicidal ideation (1.96) and attempts (2.39). Fourth, in the case of women, people with shorter sleep time showed greater stress (2.09), depression (1.94), suicidal ideation (1.96), and attempts (2.90). People with longer sleep showed greater depression (1.39), suicidal ideation (1.45) and attempts (1.71). Fifth, people's stress with greater sleep for both genders was higher than that of people with normal sleep. but there was no significant difference. Further prospective studies are needed on specific sleep dysfunctions effects on suicidal ideation and attempts.

• Journal of Digital Convergence
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• v.15 no.9
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• pp.311-319
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• 2017

The purpose of this study was to examine the relationship between hours of sleep and periodontal diseases among adolescents based on the raw materials of the 5th third-year(2012) national health and nutrition examination survey. The subjects in this study were 593 selected teens who were at the western ages of 12 to 18. SPSS 18.0 for Windows was used to analyze general characteristics, health behavior, oral health care, mental health, and relationship of sleep duration to periodontal disease. As a result, the groups of adolescents who were older and whose household income was larger slept for less hours, and higher toothbrushing frequencies led to more hours of sleep. There were 2.28-fold more periodontal diseases in the group that got five or less hours of sleep than in the group that got eight or more hours of sleep. The above-mentioned findings of the study illustrated that insufficient sleep is linked to periodontal health in adolescence.

• Journal of Digital Convergence
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• v.17 no.12
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• pp.435-444
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• 2019

The purpose of this study was to investigate the relationship between sleep duration and muscle strength in Korean adults aged 19 years and older. The cross-sectional analysis was conducted using the 2016 National Health and Nutrition Examination Survey data and Chi square test and multiple regression analysis were used. As a result of the analysis, the grip strength of those with more than weekday average sleep duration of 9 hours was found to be -1.267kg compared with those with weekday average sleep duration of 7 hours. The grip strength of those with more than weekend average sleep duration of 9 hours was found to be -0.879kg compared with those with weekend average sleep duration of 7 hours. In model simultaneously adjusting for both the average weekday and weekend average sleep duration, weekday average sleep duration of 9 hours was found to be -1.034kg compared with those with weekday average sleep duration of 7 hours. Therefore, careful observation will be required in light of the fact that both sleep duration and grip strength can predict future health conditions.

• Sleep Medicine and Psychophysiology
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• v.4 no.2
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• pp.147-155
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• 1997

To assess the reliability of chronobiological models of sleep/wake regulation, it is necerssary that the models predict the data which has been studied in sleep research, and they should be generalized across all ages. To date, many adult human data on such models have accumulated, yet it is evident that a comprehensive theory of the biorhythmic aspects of sleep/wake states has not established. Circadian rhythms such as the time going to bed, sleep onset, slow wave sleep pressure, periodicity of REM sleep, daytime performance, and early evening alertness are resumed everyday. Even in adult humans, sleep is inherently polyphasic. In both the disentrained and entrained states, naps when allowed tend to recur in a temporally lawful manner. The monophasic sleep pattern of most industrial societies therefore appears to be purely of social origin. The endogenous biorhythmic nature of circasemidian sleep tendency is supported by the ubiquity of the phenomenon across all ages. The NREM/REM sleep cycle within sleep with its inherent physiological, endocrine, and neurochemical fluctuations represents the best-documented ultradian sleep rhythms. Also, a daytime ultradian variation in sleepiness with a periodicity similar to nocturnal NREM/REM cycle(BRAC hypothesis) is suggested. This review article provides a brief synoptic review of the evidences for circadian, circasemidian, and ultradian sleep/wake rhythms, and then the authour will suggest the issues which expedite fuller modeling of sleep/wake system, to be further discussed.