• Sleep Medicine and Psychophysiology
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• v.4 no.2
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• pp.164-171
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• 1997

Introduction : Periodic limb movement disorder (PLMD) is shown to common in patients with OSA and may become evident or worsened when treated with nasal continuous positive airway pressure (CPAP). Whether this is due to im proved sleep continuity. adverse nocturnal body positioning, uncovered by CPAP, or due to the CPAP stimulus is still debat-ed. We hypothesized that the increase in PLM activity following CPAP is associated with more supine-sleeping tendencies when being treated with CPAP. In the present work, we compared differences in the PLMD index (PLMI) and sleeping position of patients with sleep disordered breathing before and after CPAP treatment. Method : We studied 16 patients (mean age 46 yr, 9M, 7F) with OSA (11 patients) or UARS (5 patients) who either had PLMD on initial polysomnogram (baseline PSG) or on nasal CPAP trial (CPAP PSG). All periodic leg movements were scored on anterior tibialis EMG during sleep according to standard criteria (net duration; 0.5-5.0 seconds, intervals; 4-90 seconds. 4 consecutive movements). Paired t-tests compared PLMD index (PLMI), PLMD-related arousal index (PLMD-ArI), respiratory disturbance index (RDI), and supine sleeping position spent with baseline PSG and CPAP PSG. Results : Ten patients (63%) on baseline PSG and fifteen patients (94%) on CPAP PSG had documented PLMD ($PLMI{\ge}5$) respectively with significant increase on CPAP PSG(p<0.05). Ten patients showed the emergence (6/10 patients) or substantial worsening (4/10 patients) of PLMD during CPAP trial. Mean CPAP pressure was $7.6{\pm}1.8\;cmH_2O$. PLMI tended to increase from baseline PSG to CPAP PSG, and significantly increase when excluding 2 outlier (baseline PSG, $19.0{\pm}25.8/hr$ vs CPAP PSG, $29.9{\pm}12.5/hr$, p<0.1). PLMD-ArI showed no significant change, but a significant decrease was detected when excluding 2 outlier (p<0.1). There was no significant sleeping positional difference (supine vs non-supine) on baseline PSG, but significantly more supine position (supine vs non-supine, p<0.05) on CPAP PSG. There was no significant difference in PLMI during supine-sleeping and nonsupine-sleeping position on both of baseline PSG and CPAP PSG. There was also no significant difference in PLMI during supine-sleeping position between baseline PSG and CPAP PSG. With nasal CPAP, there was a highly significant reduction in the RDI (baseline PSG, $14.1{\pm}21.3/hr$ vs CPAP PSG, $2.7{\pm}3.9/hr$, p<0.05). Conclusion : This preliminary data confirms previous findings that CPAP is a very effective treatment for OSA, and that PLMD is developed or worsened with treatment by CPAP. This data also indicates that supine-sleeping position is more common when being treated with CPAP. However, there was no clear evidence that supine position is the causal factor of increased PLMD with CPAP. It is, however, suggested that the relative movement limitation induced by CPAP treatment could be a contributory factor of PLMD.

• Clinical and Experimental Pediatrics
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• v.49 no.6
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• pp.602-609
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• 2006

Purpose : As the prone position is thought to be an important factor in sudden infant death syndrome(SIDS), this study was conducted to contribute to reducing SIDS by analyzing sleeping positions of infants. Methods : A face-to-face questionnaire was carried out with a total of 170 parents with a baby aged less than 6 months. Results : A total of 170 infants included 95 males(55.9 percent) and 75 females(44.1 percent); their average age was 2.8 months. 45.3 percent slept in a supine position; 34.7 percent in a side or supine position; 7.1 percent in a side position; 4.7 percent in a prone position; 4.1 percent in a non-specific position. Among those in a side position, 59.7 percent were in a supine position in the morning; 19.5 percent were in the side position; 13.4 percent were in a non-specific position; and 4.1 percent were in a prone position. To the question why they slept in a specific position, 34.9 percent answered their baby slept comfortably, and particularly, 42.9 percent in the prone position group answered so. In the supine position group, 21.6 percent answered they had no reason. Both in the prone position and side position groups, 21 percent each answered they were worried about the shape of their baby's head. In the side position group, 22 percent answered that they had a fear of choking due to vomiting. In all sleeping position groups, 8.2 percent and 7.4 percent answered it was because they had a fear of suffocation and they wanted to avoid SIDS, respectively. Conclusion : Many of the parents preferred unstable positions, e.g. the side position and the prone position, which could cause SIDS. Their decision on their baby's sleeping position was not based on exact medical knowledge, but on convenience in taking care of their baby. As it was found that only 6 percent of the subjects were advised from their pediatrist about their baby's sleeping position, moreover, it is necessary to carry out more studies and activities for preventing SIDS caused by improper sleeping positions and educating patents about recommended sleeping positions for their baby.

• Journal of Korea Technology Innovation Society
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• v.11 no.3
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• pp.335-351
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• 2008

The paper constructs the economic theory of sleeping patents in the knowledge-based economy. Starting with the definition of sleeping patents, we suggest the types of sleeping patents, intended and unintended ones. While intended sleeping patents are divided into 'for-defending technological position' and 'for-describing past technology', unintended sleeping patents include frictional, intrinsic, market-deficient, and institutional ones. We also introduce the concept of the natural rate of sleeping patent and measure the social loss due to sleeping patents. The study can contribute to solving policy problems for utilizing registered patents. For example, if we measure the natural rate of sleeping patent in Korea, we can estimate 'tolerable rate of sleeping patent' and control the extend of policy intervention for patents utilization. Since we invest the theory of sleeping patents firstly, the suggested concepts should be elaborated through further discussion in depth.

• Journal of the Korea Society of Computer and Information
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• v.15 no.6
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• pp.11-18
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• 2010

In this paper, it introduced the device that was fabricated for monitoring sleeping positions of infants with 3-axis accelerometer. Sleep monitoring studies has been usually conducted two ways. To monitor sleeping posture by installing a camera and then recording of sleep in the sleeping room continuously is the first one. The other one is monitoring pressure sensor's results data for sleeping. Those two ways' benefits are that are able to get relatively accurate sleeping posture data but, there are many disadvantages like constraints of spaces and places, the installation of sensors or cameras, and high cost. In addition, it has a lot of problems that difficult to solve. For babies, it's not easy to apply, as well as uncomfortable. The proposed method uses a 3-axis accelerometer's X axis, Y axis, Z axis position output values in order to recognize the bad ground sleeping position that use of the buzzer alarm. This method uses a 3-axis acceleration sensor to measure the data and transmit sleeping posture using Bluetooth wireless in real time monitoring. The data is helpful for prevention safety hazard such as choked themselves when they slept back side on.

• Journal of the Korean Society of Clothing and Textiles
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• v.14 no.1 s.33
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• pp.44-54
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• 1990

The purpose of this study was to investigate the effects of thickness of the sleeping pad on the physiological responses and the microclimate in the heating ondol room during sleeping time. The measuring points were skin temp., weight loss and body movement as physiological responses and the compression ratio, the temp. on/under the sleeping pad, the inside limp. of the sleeping quilts and subjective sence while 7 hours sleeping. Thickness of sleeping pads was 27.2 mm(A), 34.8 mm (B), 47.9 mm(C) used for 90 days and no used pad 60.7 mm(D). The floor surface temp. was keeping $29{\pm}1^{\circ}C$ while the environmental conditions was at $23{\pm}1^{\circ}C$ ($50{\pm}5\%$ R.H.) The results were as followings; 1) The mean compression ratio after using the sleeping pads for 45 days was about $70\%$ , and it wasn't increased any more thereafter 2) After 2 hours sleeping the temp. under the sleeping pads was shown that C and D were higher than A and B, and the temp. on the sleeping pads was shown that A and C pads were higher than B and D. But after 3-4 hours sleeping the skin temp. of legs was shown that B and D pads were higher than A and C. 3) Weight loss for C pad was significantly higher than others. Body movement and side position in tying was higher in A and C pads than B and D. 4) The inside temp. of quilt for A and C pads were higher in the early part of sleeping period than those of B and C pads and relative humidity was lower in C than others. 5) D pad was softer than others and fatigue degree was turned out to be lowest in D, the highest in A. From this point of view, we concluded that thickness of the sleeping Pad in the heating ondol room had different characteristic from that in no heating ondol room. And 35 mm used pad was turned out to be proper.

• Child Health Nursing Research
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• v.26 no.1
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• pp.82-89
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• 2020

Sudden infant death syndrome (SIDS) in Korea remains a poorly-understood subject for both professionals and the public. Recent reports have emphasized ethnic differences in SIDS rates, suggesting that making adjustments in child-rearing practices may contribute substantially to SIDS reduction. Two of the three major risk factors for SIDS-vulnerability of the infant and exogenous factors-need to be understood in particular depth due to their broad scope and sociocultural grounding. This paper presents substantial issues regarding preterm birth and male gender on infants' vulnerability to SIDS in Korea. Practices of caring for healthy infants are addressed in the context of sleeping practices, including sleeping position, bedding arrangements, sleeping on the floor, the back-to-sleep position, high indoor temperatures and ondol floor heating, and swaddling. Professional and social awareness about how to reduce SIDS should be raised by promoting a better understanding of risk factors in the context of ethnic and cultural variations in child-rearing practices.

• Korean Journal of Logic
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• v.15 no.1
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• pp.17-53
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• 2012

Some Korean Philosophers has manifested their opinions on Sleeping Beauty problem. For example, Hasuk Song and Namjoong Kim stands for an thirder, while Hanseung Kim for a perspectivistic compatibilist. In order to fill a vacant position, I shall make an argument for halfers in this paper. My presumption is that the probability the question now given to sleeping beauty is the first question among several is greater than thirder's calculated value. Futhermore, I argue that the probability the coin landed heads on condition that the question now given to sleeping beauty is the first question is greater than 1/2.

• Korean Journal of Logic
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• v.14 no.1
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• pp.1-23
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• 2011

I take the position of the thirders on the sleeping beauty problem like Elga and criticize Lewisian halfers. In particular, I attack Franceschi's recent arguments for the halfers. In addition, I claim that Bostrom's and Kim's hybrid view is not satisfactory, because it is to pre-empt or to take the burden of proof that the problem is the genuine paradox. Consequently, the purpose of this paper is to show that the thirders' argument is more intuitive than others and what the fallacies of the halfer's arguments are.

• Journal of Korean Physical Therapy Science
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• v.6 no.4
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• pp.221-227
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• 1999

This study is about the correlation of pain strength between Oswestry Disability Index and Hendler 10-Minute Screening Test in the patient of low back pain. The subject were 66, in and out patient who had recieved physical therapy on low back pain in several hospitals at Seoul and Kyungkido. during July 5.-August 27. 1999 1. The average score of Oswestry Disability Index was $24.06{\pm}8.16$ and that of Hendler 10-Minute Screening Test was $24.82{\pm}4.31$. 2. The Pearson's R score between each questionnaires of Oswestry Disability Index and pain strength was .5692. p<0.0001. So it is very high. But, that between each questionnaires of Hendler 10-Minute Screening Test and pain strength was not significant.. 2261 p<0.05 3. The Pearson's R score between Pain strength of Oswestry and person care was .3391, sex life was .3756, social life was .4637 (p<0.005) and that between Pain factor of Hendler, pain area of Hendler and sleeping(4358), sex(.6198), position change(2767), (p<0.005). So it is significant. 4. The categories where we could see the correlation between Pain strenth of Oswestry and Hendler each questionnaires were sleeping(.3222), sex(5524), position change(4291). (p<0.005).

• Journal of Preventive Medicine and Public Health
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• v.55 no.1
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• pp.98-105
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• 2022

Objectives: Low back pain (LBP) is a common chronic condition among sedentary workers that causes long-term productivity loss. This study aimed to identify the relationships of individual and occupational factors with LBP among Bangladeshi online professionals. Methods: We conducted a cross-sectional study involving 468 full-time online professionals who usually worked in a sitting position. One-month LBP complaints were assessed using a musculoskeletal subscale of subjective health complaints. The chi-square test was used to measure associations between categorical predictors and LBP, and multivariable logistic regression was conducted to identify the variables significantly associated with LBP. Results: LBP within the last month was reported by 65.6% of participants. Multivariable logistic regression analysis indicated that age >30 years (adjusted odds ratio [aOR], 0.40; 95% confidence interval [CI], 0.23 to 0.70) and being married (aOR, 0.59; 95% CI, 0.36 to 0.97) had significant negative associations with LBP. Significant positive associations were found for spending >50 hours weekly on average working in a sitting position (aOR, 1.61; 95% CI, 1.05 to 2.49), being overweight and obese (aOR, 1.87; 95% CI, 1.16 to 2.99), sleeping on a soft mattress (aOR, 2.01; 95% CI, 1.06 to 3.80), and ex-smoking status (aOR, 3.33; 95% CI, 1.41 to 7.87). Conclusions: A high prevalence of LBP was found among full-time online professionals. Long working hours in a sitting position showed a significant association with developing LBP. Smoking history, body mass index, and sleeping arrangements should also be considered while considering solutions for LBP prevalence among online professionals.