• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2021년도 춘계학술대회
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• pp.423-424
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• 2021

이 논문에서는 수면 환경을 감지하는 센서들로부터 데이터를 수집하고 이를 바탕으로 수면 환경을 최적으로 조절하여 숙면을 취할 수 있도록 도와주는 시스템을 제안한다. 수면 환경 분석은 로드셀을 통한 뒤척임 감지에 의한 수면 단계 판단을 기본으로 하고 온도, 습도, 조도 등의 데이터를 바탕으로 온열 장치, 가습기, 블라인드 등을 제어하여 숙면을 취할 수 있는 환경을 조성한다. 수면 상태에 따른 수면 환경 제어는 기상하기 쉬운 수면 상태를 유도함으로써 기상 시에 피로감을 줄일 수 있다.

• 대한임상검사과학회지
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• 제43권4호
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• pp.188-193
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• 2011

Obstructive sleep apnea (OSA) is the most common type of sleep apnea and is caused by obstruction of the upper airway. Since it is closely related to sleep parameter and body indices, the study was focused on the relationship with them. The results of polysomnography (PSG) in obstructive sleep apnea was done at ENT department of Ewha women university Mokdong hospital from March to September 2010 with 52 subjects (male 35, female 17). The leads were placed to measure electroencephalogram (EEG), electrooculogram (EOG), mandibular and anterior tibialis electromyogram (EMG), airflow in nasal and oral cavity, chest and abdominal breathing pattern, snoring sound and arterial oxygen saturation ($SpO_2$) level. From sleep parameter and body indices of adult obstructive sleep apnea compared to normal adult revealed that age (p<0.01) and snoring sound (p<0.05) were increased, stage 1 sleep (p<0.01) was increased, the deeper stages (3&4) of sleep (p<0.05) were reduced. Respiratory disturbance index (RDI) (p<0.01), mean $SpO_2$ (p<0.05) and lowest $SpO_2$ (p<0.01) were also decreased. The correlation analysis from sleep parameter and body indices of OSA showed the positive correlation with age (r=0.463, p<0.001), snoring sound (r=0.278, p<0.05), stage 1 sleep (r=0.391, p<0.01) and RDI (r=0.409, p<0.01), but showed the negative correlation with the deeper stages (3&4) of sleep (r=-0.307, p<0.05), mean $SpO_2$=(r=-0.274, p<0.05) and lowest $SpO_2$ (r=-0.392, p<0.01). This study proves that obstructive sleep apnea and indices have closed related.

• 한국콘텐츠학회논문지
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• 제22권8호
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• pp.640-647
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• 2022

본 연구의 목적은 간호대학생의 수면의 질에 영향을 미치는 요인을 우울, 수면 전 스마트폰 사용행태 및 학업 성적을 중심으로 파악하고자 하였다. 2개 대학 3, 4학년 간호학과 학생 중 임의 표출 방식으로 선정한 대상자 196명을 대상으로 하였다. 수면의 질 도구(PSQI-K), 우울 도구(한국판 Beck의 우울척도-II), 수면 전 스마트폰 사용행태 도구를 활용하여 2021년 4월에서 7월까지 자료 수집하였고, 간호대학생의 수면의 질에 미치는 영향력은 단계적 다중회귀분석으로 분석하였다. 연구 결과 간호대학생의 수면의 질은 우울과 수면 전 스마트폰 사용행태 2개의 변수가 39.0%를 설명하고 있었으며, 통계적으로 유의하였다. 즉, 우울 수준이 높을수록, 수면 전 스마트폰 사용행태 수준이 높을수록 수면의 질 수준이 유의하게 낮았다. 그러나 성적은 간호대학생의 수면의 질에 영향을 미치는 유의한 변수는 아니었다. 결론적으로 간호대학생의 수면의 질을 향상하기 위해서는 우울과 관련된 수면 양상의 부정적인 영향을 최소화하고, 수면 전 스마트폰 사용행태를 줄이는 생활 습관 교정이 필요하다.

• Journal of Korean Biological Nursing Science
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• 제19권3호
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• pp.198-205
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• 2017

Purpose: The purpose of this study was to identify sleep patterns, alertness, and fatigue of shift nurses according to circadian types. Methods: The researchers' enrolled 17 nurses doing shift work in a tertiary hospital. To evaluate circadian types, a morningness-eveningness questionnaire (MEQ) was administered. Sleep patterns were examined using an actigraph for 14 days. To assess alertness and fatigue, Visual Analogue Scale (VAS) was used. The data were analyzed using ANOVA and Kruskal-Wallis test with a SPSS 21.0 program. Results: The researchers found that 17.6% of participants reported morning type, 47.1% neither type, and 35.3% evening type. Mean total sleep time (TST) was 6.8 h, mean sleep efficacy was 82%, level of alertness was 6.54, and level of fatigue was 5.49, regardless of the type of shift work. Evening type nurses had higher variation in TST and alertness, according to the shift patterns than other circadian type nurses. Evening type nurses also had higher fatigue levels than other circadian type nurses. Conclusion: Sleep, alertness, and fatigue were related with circadian types. These results suggest that circadian rhythm management in shift work nurses, particularly in evening type nurses is urgently needed to improve sleep patterns, alertness, and to decrease the level of fatigue.

• Child Health Nursing Research
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• 제13권2호
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• pp.147-156
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• 2007

Purpose: The purpose of this study was to investigate the sleep/activity patterns of premature babies. Method: The subjects were 55 premature babies who were hospitalized in the Neonatal Intensive Care Unit (NICU) of one University Hospital in Daejeon from September 1, 2004 to March 31, 2006. The sleep/activity patterns of the premature babies were observed for 24 hours a day for 7 days. The observations were made and recorded by the researcher and 5 trained research assistants using NCASA records developed by Barnard et al. (1979). For statistical analysis, frequency, average, t-test, and Pearson correlation coefficients were used. Results: The infants slept more and had less awake periods during daytime than full-term infants. As the hospital stay of the premature babies increased, the amount of daytime sleep and total daily sleep decreased, and the amount of daytime awake periods increased. Conclusions: The findings suggest that the level of physical and physiological maturity of premature babies is one of the major variables that affect their sleep/activity patterns. Furthermore, the findings of this study will provide information about the sleep/activity patterns of premature babies, and present baseline data to develop the nursing intervention programs which support optimum development for the premature babies.

• 한국통신학회논문지
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• 제32권3A호
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• pp.221-229
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• 2007

본 논문에서는 IEEE 802.16e 기반 Wireless Metropolitan Area Network (WMAN) 이동 단말의 전력 소모 최소화를 위한 최적 휴면 기법 (sleep mode)을 제안한다. 802.16e 표준에 정의된 sleep 모드 단말은 항상 현재 접속 중인 기지국 (BS)과 상태 정보를 유지해야 하므로, 단말이 기지국을 이동할 때마다 새로운 기지국과 sleep 상태를 재 협상해야 한다. 따라서 sleep 모드는 단말의 이동성이 클수록 헨드오버 (handover)에 의해 불필요한 전력 소모가 증가한다. 이에 따라 본 논문에서는 단말의 이동성은 사용자의 호 사용 패턴과 무관하다는 것에 착안하여 헨드오버에 따른 불필요한 베터리 소모를 제거할 수 있는 최적 휴면 기법을 제안한다. 본 논문에서는 제안 기법의 성능을 전력 소모량과 착신 호의 초기 응답 시간 측면에서 수학적으로 분석하였고 모의 실험을 통해 제안한 분석 모델을 검증하였다. 또한 기존 sleep 모드와 제안 기법의 성능을 모의 실험을 통해 비교하여 제안 기법은 기존 sleep 모드에 비해 수용 가능할 만큼의 초기 응답 시간을 증가시키지만 전력 소모량을 보다 많이 줄일 수 있다는 것을 검증하였다.

• Safety and Health at Work
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• 제10권1호
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• pp.67-74
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• 2019

Background: Few studies have examined the effects of a forward rotating shift pattern on police employee performance and well-being. This study sought to compare sleep duration, cognitive performance, and vigilance at the start and end of each shift within a three-shift, forward rotating shift pattern, common in United Kingdom police forces. Methods: Twenty-three police employee participants were recruited from North Yorkshire Police (mean age, 43 years). The participants were all working the same, 10-day, forward rotating shift pattern. No other exclusion criteria were stipulated. Sleep data were gathered using both actigraphy and self-reported methods; cognitive performance and vigilance were assessed using a customized test battery, comprising five tests: motor praxis task, visual object learning task, NBACK, digital symbol substitution task, and psychomotor vigilance test. Statistical comparisons were conducted, taking into account the shift type, shift number, and the start and end of each shift worked. Results: Sleep duration was found to be significantly reduced after night shifts. Results showed a significant main effect of shift type in the visual object learning task and NBACK task and also a significant main effect of start/end in the digital symbol substitution task, along with a number of significant interactions. Conclusion: The results of the tests indicated that learning and practice effects may have an effect on results of some of the tests. However, it is also possible that due to the fast rotating nature of the shift pattern, participants did not adjust to any particular shift; hence, their performance in the cognitive and vigilance tests did not suffer significantly as a result of this particular shift pattern.

• Journal of Korean Biological Nursing Science
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• 제21권3호
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• pp.231-238
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• 2019

Purpose: In 2015, South Korea had the highest global smartphone penetration (88%). However, smartphone addiction can seriously disrupt daily life and have a major negative impact on academic achievement. Methods: A structured questionnaire was completed by 250 nursing students for this descriptive study. Results: Students who were older, more satisfied with their major, exercised, and used their smartphone for less than 30 minutes before sleeping had higher learning engagement than those who were younger, less satisfied, did not exercise and used their smartphone for more than three hours. Quality of sleep and smartphone addiction were negatively correlated as was quality of sleep and daytime sleepiness. Interestingly, sleep pattern did not impact learning engagement directly. Conclusion: Smartphone usage influences learning engagement of nursing students rather than their sleeping patterns, which suggests a need to develop self-disciplining strategies for smartphone use to enhance learning engagement.

• Journal of the Korean Data and Information Science Society
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• 제27권3호
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• pp.773-789
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• 2016

본 연구는 노인요양병원 입원노인의 수면양상 및 영향요인을 파악하여 이들의 수면의 질 향상을 위한 중재프로그램 개발 시 기초자료로 활용하고자 시도된 서술적 조사연구이다. G시 노인요양병원에 입원한 65세 이상의 노인환자 142명을 대상으로 구조화된 설문지와 24시간 수면기록지를 사용하여 자료 수집하였다. 요양병원 입원노인의 일일 평균 수면시간은 10.7시간이었으며 낮 수면시간은 평균 3.9시간, 밤 수면시간은 평균 6.8시간 이었다. 총 수면규칙성은 71.7%였고, 낮 수면규칙성은 평균 58.1%, 밤 수면규칙성은 평균 80.5%였다. 요양병원 입원노인의 수면시간에 영향을 주는 예측요인은 병실 내 치매환자 유무로 10.3%의 설명력을 나타냈고, 수면 규칙성에 영향을 미치는 예측요인은 통증, 병실 내 치매환자 유무, 신체기능으로 16.1%의 설명력을 나타냈다. 따라서 요양병원 입원노인의 수면양상에 영향을 미치는 추가요인 규명을 위한 후속 연구의 필요성과, 본 연구에서 확인된 요양병원 입원노인의 수면에 영향을 미치는 요인을 고려한 중재프로그램 개발 및 적용이 필요하다.

• 대한불안의학회지
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• 제12권2호
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• pp.113-118
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• 2016

Objective : Premenstrual syndrome (PMS) and premenstrual dysphoric disorder (PMDD) is known to reduce the quality of sleep and is associated with various psychiatric disorders. The aim of this study was to investigate the relationship of PMS with depression, sleep qulity and sleep pattern in Korean female adolescents. Methods : Out of 867 high school female students, 400 female subjects were included in this study. All participants completed self-report questionnaires that included demographic variables, shortened premenstrual assessment form (SPAF), patient health questionnaire-9 (PHQ-9), Pittsburgh sleep quality index (PSQI), Epworth sleepiness scale (ESS), insomnia severity index (ISI) and Korean translation of composite scale (CS). A total of 394 individuals who completed the questionnaires were analyzed. Results : As score of SPAF, 143 subjects was defined PMDD group. They had more prevalence of eveningness, more depressive symptom, poorer sleep quality, and more excessive sleepiness than non-PMDD groups. Although the PMDD groups showed more menstrual dysmenorrhea, no difference was found in bleeding duration and cycle. PMS symptom had correlations with depression, poorer sleep quality and excessive sleepiness during the daytime. There was no difference in sleep duration between two groups, but PMS might have a relationship with eveningness of chronotype. Conclusions : Among Korean female high school students, the PMS might have an association with depression and poor sleep quality, and it might lead to daytime impairment due to excessive sleepiness. An appropriate evaluation of PMS could be helpful in determining the mental health condition of adolescents.