• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2010년도 한국컴퓨터종합학술대회논문집 Vol.37 No.1(D)
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• pp.360-365
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• 2010

In this paper, we present a distributed algorithm for detecting dynamic event regions in wireless sensor network with the consideration on energy saving. Our model is that the sensing field is monitored by a large number of randomly distributed sensors with low-power battery and limited functionality, and that the event region is dynamic with motion or changing the shape. At any time that the event happens, we need some sensors awake to detect it and to wake up its k-hop neighbors to detect further events. Scheduling for the network to save the total power-cost or to maximize the monitoring time has been studied extensively. Our scheme is that some predetermined sensors, called critical sensors are awake all the time and when the event is detected by a critical sensor the sensor broadcasts to the neighbors to check their sensing area. Then the neighbors check their area and decide whether they wake up or remain in sleeping mode with certain criteria. Our algorithm uses only 2 bit of information in communication between sensors, thus the total communication cost is low, and the speed of detecting all event region is high. We adapt two kinds of measure for the wake-up decision. With suitable threshold values, our algorithm can be applied for many applications and for the trade-off between energy saving and the efficiency of event detection.

• 설비공학논문집
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• 제18권7호
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• pp.535-540
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• 2006

This study was performed In evaluate sleep efficiencies and conditions for comfortable sleep based on the analysis of Physiological signals under variations in thermal conditions. Five female subjects who have similar life cycle and sleep patterns were participated for the sleep experiment. It was checked whether they had a good sleep before the night of experiment. EEGs were obtained from C3-A2 and C4-A1 electrode sites and EOGs were acquired from LOC (left outer canthus) and ROC (right outer canthus) for REM sleep detection. Sleep stages were classified, then TST (total sleep time), SWS (slow wave sleep) latency and SWS/TST were calculated for the evaluation of sleep efficiencies on thermal conditions. TST was defined as an amount of time from sleep stage 1 to wakeup. SWS latency was from light off time to sleep stage 3 and percentage of SWS over TST was calculated for the evaluation of sleep quality and comfort sleep under thermal conditions. As result, the condition which raise a room temperature provided comfortable sleep.

• 생명과학회지
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• 제16권1호
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• pp.156-161
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• 2006

The essential oil of Nardostachys jatamansi (Valerianaceae), which has been used for a long time in aroma therapy, was investigated after inhalation or oral administration for its analgesic effect, anticonvulsant action, hypnotic effect and in vitro inhibitory activity on monoamine oxidase. This fragrance oil showed a significant analgesic effect in the phenylquinone-induced .writhing test, suppressed the convulsion induced by pentylenetetrazole and lengthened the pentobarbital-induced sleeping time in a time-dependent manner after fragrance inhalation or dose-independently by oral administration. Its inhibitory activity on monoamine oxidase was remarkable, showing $49.4\%$ inhibition at a concentration of 5.0 mg/ml. Six new terpenes with seven known compounds were detected by our GC-MS analytical conditions used. As a result, the essential oil fragrance of Nardostachys jatamansi would be clinically useful for a sedative by either inhalation or oral administration.

• Biomolecules & Therapeutics
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• 제4권2호
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• pp.184-189
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• 1996

General pharmacological studies of LB20304a (a mesylate salt form of a new quinolone antibiotic LB20304 following oral administration of 300 mg/kg and 1000 mg/kg, almost maximum tolerance dose in mice and rat, respectively, were performed in terms of effects on general behaviour, central nervous system, gastrointestinal system, and blood coagulation system in mice and rats. With regards to general behaviour of mice, at oral dose of 300 mg/kg, LB20304a reduced muscle tone and locomotor activity. In terms of CNS, at oral treatment of 300 mg/kg, LB20304a showed some analgesic effects in mice, and oral dose of 1000 mg/kg caused drop in normal body temperature of rat, while it enhanced the pentylenetetrazole-induced clonic convulsion to tonic convulsion and/or death in mice at the doses of unto 300 mg/kg. In addition, LB20304a increased hexobarbital-induced sleeping time two and three times in mice at oral doses of 20 mg/kg and 300 mg/kg, respectively. Rota-rod and traction test in mice were not influenced by the dose of 300 mg/kg and 200 mg/kg, respectively. LB20304a reduced gastric secretion of rat at dose of 1000 mg/kg, and increased intestinal motility of mice at dose of 300 mg/kg. In rats, blood coagulation index, such as PT (prothrombin time) and aPTT (activated partial thromboplastin time) were not affected by the treatment of upto 1000 mg/kg of LB 20304a.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• 제34권1호
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• pp.21-29
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• 2023

This paper reviews the global effect of the coronavirus disease 2019 (COVID-19) pandemic on the mental health of children and adolescents in South Korea, the U.S., Japan, and China. We reviewed research on deteriorated mental health, including increased suicide, suicidal thoughts, and self-harm. Various studies have shown that students' mental health issues, such as depression and anxiety, have worsened during the COVID-19 pandemic. Furthermore, the number of students who committed suicide has significantly increased in the U.S. and Japan. Factors such as prior mental health status, change in daily routine, reduced physical activity, excessive screen time, overuse of electronic devices, and reduced social support have been reported to have a significant effect. The chain of deteriorating mental health among the youth began at the onset of COVID-19, social distancing, and school closure. As youths began to stay at home instead of going to school, they lost opportunities to connect with their friends or teachers, who could provide support outside of their homes. Young people spent less time on physical activity and more time online, which damaged their sleeping schedule and daily routine. In preparing for the post-pandemic phase, we should thoroughly analyze the long-term effects of the pandemic on youth mental health, while simultaneously tackling current imminent issues.

• Animal Bioscience
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• 제37권5호
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• pp.944-951
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• 2024

Objective: Parturition is crucial for dams, their calves, and cow managers. The prediction of calving time, which assists cow managers to decide on the relocation of cows to maternity pens and necessity of human supervision, is a pivotal aspect of livestock farming. However, existing methods of predicting calving time in dairy cows based on hormonal changes and clinical symptoms are time-consuming and yield unreliable predictions. Accordingly, we investigated whether heart rate variability (HRV) which is a non-invasive assessment of autonomic nervous system (ANS) activity and behavior during the prepartum period would be useful for predicting calving time in dairy cows. Methods: Eight pregnant cows were surveilled under electrocardiogram and video recordings for HRV and behavioral analyses, respectively. HRV parameters in time and frequency domains were evaluated. A 24-h time budget was calculated for each of six types of behavior (standing and lying with or without rumination, sleeping, and eating). Results: Heart rate on calving day is considerably higher than those recorded on the days preceding calving. Low frequency power declined, whereas high frequency power escalated on the calving day compared to the period between 24 and 48 h before calving. The time budget for ruminating while lying decreased and that while standing increased markedly on the calving day compared to those allocated on the preceding days; nonetheless, the total time budget for ruminating did not differ during the prepartum period. Conclusion: We elucidated the ANS activity and behavioral profiles during prepartum period. Our results confirm that HRV parameters and behavior are useful for predicting calving time, and interestingly indicate that the time budget for ruminating while standing (or lying) may serve as a valuable predictor of calving. Collectively, our findings lay the foundation for future investigations to determine other potential predictors and formulate an algorithm for predicting calving time.

• 부모자녀건강학회지
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• 제3권1호
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• pp.46-59
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• 2000

The purpose of this study is to determine whether the NCASA (Nursing Child Assessment Sleep/Activity Record) would be suitable to evaluate and to provide the basic resources for a Korean model of sleep/activity patterns during the first 6 months Korean infants' lives and to provide a basis for nursing intervention for mothers of early infants. The subjects of this study were 94 normal infants from birth to 6 months of age who visited the postpartum care center and two general hospitals located in Pusan from February 1 to April 28, 2000. The method of data collection was through convenient sampling. The instrument of this study was the NCASA translated by the Korean parent Child Health Academic Association. The collected data were analysed by mean, standard deviation, frequency percentage and ANOVA, Post Hoc test by use of SPSS/PC. The conclusions obtained from this study are summarized as follows: 1. The mean amount of daytime sleep was 8.06 hours. The mean amount of nighttime sleep was 6.31 hours. The mean amount of total daily sleep was 14.37 hours. The mean of the longest sleep period was 5.20 hours. The mean regularity of daytime sleep was 25.84%. The mean regularity of nighttime sleep was 77.69%. The mean regularity of total daily sleep was 42.60%. The mean frequency of nighttime wakenings was 2.33 times. 2. The mean amount of daytime activity was 8.25 hours. The mean amount of nighttime activity was 1.39 hours. The mean amount of daily total activity was 9.64 hours. The mean of the longest activity period was 3.80 hours The mean frequency of daytime feeding was 5.69 times. The mean frequency of nighttime feeding was 2.08 times. The mean frequency of total daily feeding was 7.74 times. The mean frequency regularity of feeding was 54.62%. The mean frequency of wakenings was 5.14 times. The mean frequency of crying was 1.90 times. 3. According to an analysis of sleep patterns based on an infant's age, there were some significant differences in the following factors: amount of daytime sleep(p<.001), amount of night time sleep(p<.05), amount of total daily sleep (p<.001), longest sleep period(p<.001), regularity of daytime sleep(p<.001), regularity of nighttime sleep(p<.01), regularity of total daily sleep(p<.001), frequency of nighttime wakenings(p<.001). 4. According to an analysis of activity patterns based on an infant's age, there were some significant differences in the following factors: amount of daytime activity(p<.001), amount of nighttime activity(p<.01), amount of total daily activity(p<.001), longest activity period(p<.05), frequency of nighttime feeding(p<.01), frequency of wakenings(p<.001). 5. The mean amount of a mother's day time was 16.30 hours. The mean amount of a mother's night time was 7.70 hours. In conclusion, the initial irregular sleeping and activity patterns of the early infant became regurized as the infant grew older and estabilished firmer patterns of sleeping and of activity.

• 한국산학기술학회논문지
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• 제15권9호
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• pp.5610-5620
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• 2014

본 연구는 일부 사무직 행정공무원들의 직무스트레스 수준을 파악하고 사회심리적 요인(A형 행동유형, 통제신념, 자기존중감)과 직무스트레스와의 관련성을 규명하고자 시도하였다. 연구대상은 C도청에 근무하고 있는 공무원 634명(남자 505명, 여자 129명)이었으며, 자료 수집은 2013년 2월 18일부터 3월 10일까지의 기간 동안에 구조화된 무기명 자기기입식 설문지를 이용한 설문조사에 의하였다. 연구결과, 조사대상자의 직무스트레스 수준은 성별, 연령, 학력, 결혼상태, 직급, 근무경력, 공무원생활에 대한 만족도, 흡연상태, 음주상태, 수면시간, A형행동유형, 통제신념 및 자기존중감에 따라서 유의한 차이를 보였다. 사회심리적 요인과 직무스트레스 수준과의 상관관계를 보면, 업무요구도는 내적 통제신념과 유의한 음의 상관관계를 보였으며, 업무의 자율성은 A형행동유형, 내적 통제신념 및 자기존중감과 유의한 음의 상관관계를 보였다. 상사의 지지도는 외적 통제신념과 유의한 음의 상관관계를 보였다. 위계적다중회귀분석 결과 직무스트레스 수준에 영향을 미치는 요인으로는 연령, 주관적인 건강상태, 직위, 잔업시간, 질병으로 인한 결근, 업무에 대한 만족도, 수면시간, 여가시간, 외래진료경험유무, A형행동유형, 통제신념 및 자기존중감이 선정되었으며 이들의 설명력은 32.1%이었다. 위의 모델에서 보면 A형행동유형, 통제신념 및 자기존중감 등의 사회심리적 요인이 추가됨으로 해서 15.0%의 설명력을 증가시켜 직무스트레스에 사회심리적 요인이 큰 영향을 미치고 있음을 알 수 있었다.

• 한국자원식물학회지
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• 제26권1호
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• pp.44-51
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• 2013

본 연구에서는 파극천 추출물의 수면연장 시간, 항 경련효과 및 시험관내에서 파극천의 각 분획별 활성산소의 소거능을 관찰하여 본 결과 pentobarbital을 투여한 대조군의 수면 유도시간 및 수면시간($3.77{\pm}0.56$분, 수면시간 $68.3{\pm}6.8$분)이 파극천 추출물(200 mg/kg)을 전 처리하고 pentobarbital을 투여함으로써 수면유도 시간($3.95{\pm}0.56$분) 및 수면시간($110.4{\pm}10.3$분)이 연장되었다. PTZ에 의해 유도되는 경련 발작이 대조군 $4.9{\pm}0.98$인데 비해 파극천(200 mg/kg)의 전처리로 경련박작이 $3.2{\pm}0.54$로 현저히 억제되었으며 이 결과는 PTZ의 경련발현시간, 경련유지시간 및 사망시간에 미치는 파극천의 영향과 유사하였다. 뇌중 GABA 함량은 PTZ의 투여로 정상군에 비하여 억제되던 것이 파극천의 전처리로 증가 되었으며, GABA-T의 활성과 지질과산화의 함량은 PTZ의 투여로 각각 증가되던 것이 파극천 추출물의 투여로 억제되었다. 시험관내에서 PTZ로 유도된 뇌조직중의 hydroxy radical의 생성량은 butanol 및 dichlomethane 분획의 첨가($20{\times}10^{-2}g/ml$)에서 약 35%에서 50%까지 감소하였다.

• 가정과삶의질연구
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• 제18권2호
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• pp.1-14
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• 2000

The purpose of this study is to compared the length of working hours and its effects on family life for Korean and Japanese full-time working couples. For this study, the survey used structured questionnaires and time diaries(one weekday and holiday), and the data were collected in the fall of 1995. A subsample of full-time working couples, 82 couples from Seoul and 79 couples from Tokyo, was used for the purpose of this study. The major findings are as follows; 1) On average, the weekday working hours of Korean husbands were longer than Japanese husbands(11 hours 31 minute, 10 hours 52 minutes a day, respectively). Wives in both countries worked almost identical lengths of time (9 hours 2 minutes in Korea and 8 hours 42 minutes in Japan). Working hours of husbands were longer than those of wives in both countries. Husbands' overtime. Almost (90%) of our Korea sample worked 6 days or 5 1/2 days per week, however the majority (69%) of our Japanese sample worked only 5 days per eek. 2) More Korean husbands and wives reported that their family life was constrained by wives working hours than their Japanese counterparts did. 3) All wives in both countries reported that the husbands long working hours has effects on quality family time. Korean wives perceived that their working hours had effects on time spent on child care, however Japanese wives perceived that their working hours affected their personal time and housework time. Korean husbands agreed with their wives working hours negatively affected their personal leisure time. Japanese husbands reported that their working hours negatively affected their sleeping time.