• Journal of the Korean Society of Clothing and Textiles
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• v.21 no.3
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• pp.516-523
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• 1997

The actual conditions of bedclimate are investigated depending on the regions and housing styles used on ondol in spring. Sixty healthy men and women (30 of them live in apartment and 30 of them live in detached house, 20 of them live in Wonju, 20 of them live in Cheongiu and 20 of them live in Pusan). The results are as follows: 1) The differences of bedclothes thickness between spring and autumn were not significant. weight of sleep-wear in spring was less than those in the autumn. 2) In the spring, the temperature and humidity of bedroom, floor, on/under the mattress, were lower and the temperature inside the sleep-wear was higher than those in the autumn. 3) The differences of the temperature and humidity of bedroom, the bed climate, and the clothing microclimate were significant by the regions and housing styles in spring. The temperature of bedroom and inside sleep-wear, the humidity of bedroom and inside sleep- wear in the apartment were higher than those in the detached house. 4) The differences of comfort sensation on the bedroom conditions was significant by the regions, and the differences of thermal sensation was significant by the housing styles. Most subjects perceived warm and dry but comfortable.

• Journal of Menopausal Medicine
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• v.24 no.3
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• pp.143-149
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• 2018

Lack of adequate sleep has become increasingly common in our 24/7 modern society. Reduced sleep has significant health consequences including metabolic and cardiovascular disorders, and mental problems including depression. In addition, although the increase in life expectancy has provided a dream of longevity to humans, the occurrence of osteoporosis is a big obstacle to this dream for both male and female. It is known that insomnia and bone health problems, which are very critical conditions in human life, interestingly, share a lot of pathogenesis in recent decades. Nevertheless, due to another side effects of the synthetic drugs being taken for the treatment of insomnia and osteoporosis, patients have substantial anxiety for the safety of drugs with therapeutic expectation. This review examines the pathogenesis shared by sleep and osteoporosis together and herbal medicine, which has recently been shown to be safe and efficacious in the treatment of both diseases other than synthetic drugs. We suggestions for how to treat osteoporosis. These efforts will be the first step toward enabling patients to have comfortable and safe prescriptions through a wide selection of therapeutic agents in the future.

• Sleep Medicine and Psychophysiology
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• v.5 no.1
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• pp.111-117
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• 1998

Objectives : 'First-night effect' has been a well-known concept since 1960's. It is important because it is one of the major factors to be considered in assessing the reliability of polysomnographic data. However, 'reverse first-night effect' has also been described, resulting in the inconsistency of conceptualization. We attempted to investigate on the first-night effect in adults by having each of them take two nights of polysomnography in a controlled environment. Young healthy adult volunteers were chosen as subjects in order to rule out age- or health-related confounders. Methods : Polysomnography was performed on eight male medical students (mean $age=23.5\;{\pm}\;0.9$) for two nights with Grass model 78 polysomnograph. We scored manually under the standard protocol each epoch of the sleep records. Sleep variables were obtained and compared between the two nights. Results : Sleep period time(SPT) and total sleep time(TST) of the third fraction of night were significantly longer on the first night than on the second night (p<0.05). However, other sleep variables such as percentage of each sleep stage, sleep latency, REM sleep latency, number of waking, and sleep efficiency were not different between the two nights. Conclusion : We could not confirm the existence of first-night effect in this study. In healthy young male adults, it may not happen at all or may happen to a very negligible degree. Young healthy adults may have more adaptability to a new sleep environment. Also, the provision of a reasonably comfortable sleep environment could have helped them with abolition of first-night effect.

• Korean Journal of Human Ecology
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• v.10 no.4
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• pp.349-355
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• 2001

The use of bed in Korea has increased steadily, however, intensive survey on the general use and consumer's evaluation of their beds have not been performed sufficiently, yet. Thus, the purpose of this study is to investigate the actual use of the consumer and their degree of evaluation for the component of the bed as well as their feeling of discomfort on the various parts of body. More than one hundred users of commercial beds were responded to the survey. The results obtained were as follows: (1) Complaint about the depression of the mattress and the noise from the bed was apparent in the current use of beds. (2) Important physical variable related to the comfortable sensation of the sleeping was the degree of support in maintaining the natural shape of the spine and waist. Durability and the degree of hardness of the mattress were also important physical parameters of bed perceived by consumer. (3) The degree of discomfort on the back and waist during sleep was closely related to the comfort evaluation of the bed.

• Journal of the Korean housing association
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• v.13 no.4
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• pp.11-17
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• 2002

During the rapid economic growth, many buildings have been built unfaithfully. As a result, the buildings have finished their role in 10 years with dangerous structural elements and deteriorative facilities. This study planned to renovate an old independent house as an original and individual interior space which is its advantage. A house is not the place to eat and sleep, but multiple space with various functions, such as shelter, working, rest, and education. The purpose of this study was to make house environment useful and comfortable by understanding such a situation and by predicting future problems.

• Journal of Internet of Things and Convergence
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• v.8 no.6
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• pp.27-33
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• 2022

Sleep is an essential factor for living a healthy life, but most modern people complain of poor sleep. For these people, as the need for a means to simply evaluate and manage the quality of sleep increases, devices that can check the sleep state at home without monitoring by an examiner are being developed. The smart sleep mask, which is the subject of this usability test, provides bio-signal monitoring while sleeping so that you can conveniently measure and manage your sleep state for yourself. The purpose of this study is to evaluate the usability and safety of the smart sleep mask, to find and prevent potential factors related to errors in use that may occur, and to develop the comfort and safety of this product. As a result of the formative evaluation of the sleep mask prototype, it was reported that it was difficult to turn on the power and check the results, and that the sleep mask was not comfortable to wear. Different opinions were presented on the size and weight of the sleeping mask by people in different age groups.

• Journal of the Korea Convergence Society
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• v.12 no.9
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• pp.31-37
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• 2021

Recently, in the market of home appliances, the technical differentiation of products using convergence technology has been receiving a lot of response to satisfy consumer demand. However, air-conditioner products are an area that requires research and development in the early stages of convergence technology. In this paper, it is developed that a non-contact bio-signal(respiration, movement) collection technology using IR-UWB(Impulse-Radio Ultra Wideband) technology, which controls the air-conditioner direction according to the user's location and also monitors sleep to provide an optimal sleep environment. In addition, emotional lighting and ASMR are developed to provide a comfortable and emotional place of life. Finally, based on the developed convergence technology, we develop intelligent smart air-conditioning services for the convenience of daily life and a comfortable resting space.

• Science of Emotion and Sensibility
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• v.6 no.4
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• pp.9-14
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• 2003

Sleep stages have been useful indicator to check a person's comfortableness in a sleep, But the traditional method of scoring sleep stages with polysomnography based on the integrated analysis of the electroencephalogram(EEG), electrooculogram(EOG), electrocardiogram(ECG), and electromyogram(EMG) is too restrictive to take a comfortable sleep for the participants, While the sympathetic nervous system is predominant during a wakefulness, the parasympathetic nervous system is more active during a sleep, Cardiovascular function is controlled by this autonomic nervous system, So, we have interpreted the heart rate variability(HRV) among sleep stages to find a simple method of classifying sleep stages, Six healthy male college students participated, and 12 night sleeps were recorded in this research, Sleep stages based on the "Standard scoring system for sleep stage" were automatically classified with polysomnograph by measuring EEG, EOG, ECG, and EMG(chin and leg) for the six participants during sleeping, To extract only the ECG signals from the polysomnograph and to interpret the HRV, a Sleep Data Acquisition/Analysis System was devised in this research, The power spectrum of HRV was divided into three ranges; low frequency(LF), medium frequency(MF), and high frequency(HF), It showed that, the LF/HF ratio of the Stage W(Wakefulness) was 325% higher than that of the Stage 2(p＜.05), 628% higher than that of the Stage 3(p＜.001), and 800% higher than that of the Stage 4(p＜.001), Moreover, this ratio of the Stage 4 was 427% lower than that of the Stage REM (rapid eye movement) (p＜.05) and 418% lower than that of the Stage l(p＜.05), respectively, It was observed that the LF/HF ratio decreased monotonously as the sleep stage changes from the Stage W, Stage REM, Stage 1, Stage 2, Stage 3, to Stage 4, While the difference of the MF/(LF+HF) ratio among sleep Stages was not significant, it was higher in the Stage REM and Stage 3 than that of in the other sleep stages in view of descriptive statistic analysis for the sample group.

• Journal of the Korean Society of Clothing and Textiles
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• v.17 no.2
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• pp.291-299
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• 1993

In this study, bedclimate was investigated depending on three bedquilts used on ondol in winter. The environmental room condition and the ondol surface temperature were maintained $20{\pm}1^{\circ}C$, $50{\pm}3%R$. H and $30{\pm}1^{\circ}C$, respectively. The materials of the experimental quilts were not different from each other. But the weights of cotton filler were 1.5, 3.0, and 4.5kg for the bedquilts. Two healthy young women were subjected for seven hour's sleep with two replications for this study. The results are as follows. 1) The range of temperature under the mattress was higher($38.5{\sim}43.2^{\circ}C$) than that of the temperature on the mattress($32.4{\sim}37.0^{\circ}C$) or that of the temperature inside the bedquilts($30.2{\sim}34.5^{\circ}C$). The humidity inside the bedquilts was 40~73%R.H. 2) The range of bedclimate which subjects feel comfortable were $33.6{\sim}37.1^{\circ}C$ on the mattress, $30.2{\sim}33.6^{\circ}C$, 42~67%R.H. inside the bedquilts. At this range, the mean skin temperature of the subjects was was $34.7{\sim}35.6^{\circ}C$. 3) When there was heating, the weight of mattress increased due to evaporation by heat from below, while wehght of other bedding increased. 4) The lower limbs are noted to be a good representative for the prediction of the skin temperature during sleep. 5) The thicker the bedquilt, the warmer and more humid the bedquilt, which induce frequent body movement during sleep, hence inferior comfort properties of bedquilts.

• Journal of the Korean Society of Clothing and Textiles
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• v.20 no.4
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• pp.697-706
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• 1996

The actual conditions of bed climate are investigated depending on the regions and housing styles used on ondol in autumn and winter. Sixty healthy men and women (30 of them live in apartmrnt and 30 of them live in detached house, 20 of them live in Wonju, 20 of them live in Wonju, 20 of them live in Cheongju and 20 of them live in Pusan) The results are as follows: 1) No significant differences was shown between the seasons of bedclothes thickness. 2) In the autumn, the temperature and humidity of bedroom, on the mattress, inside the bedquilt, and inside the sleep-wear were higher than those in the winter. The temperature of ondol floor and under the mattress in winter were higher than those in the autumn. 3) The differences of the temperature and humidity of bedroom, the bed climate, and the clothing microclimate were significant by the regions and housing styles in both seasons. In both seasons, the temperature of bedroom, on the mattress, inside sleep-wear in the apartment were higher than those in the detached house. 4) The differences of subjective sensation on the bedroom conditions were not significant by the sextons, the regions, and the housing styles. Most subjects perceived that the conditions of bedroom were somehow hot and dry, but comfortable.