• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.493-496
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• 2005

For home healthcare, the unconstrained measurement of physiological signal is highly required to avoid the inconvenience of users. The recording and analysis of the fundamental parameters during sleep like respiration and heart beat provide valuable information on his/her healthcare. Using the air mattress sensor system, the respiration and heart beat movements can be measured without any harness or sensor on the subject's body. The differential measurement technique between two air cells is adopted to enhance the sensitivity. The balancing tube between two air cells is used to increase the robustness against postural changes during the measurement period. The meaningful frequency range could be selected by the pneumatic filter with balancing tube. ECG (Electrocardiography) and respiration sensor (plethysmography) were measured for comparison with the signal from air mattress. To extract the heart beat information from air pressure sensor, digital signal processing technique was used. The accuracy for breathing interval and heart beat monitoring was acceptable. It shows the potentials of air mattress sensor system to be the unconstrained home sleep monitoring system.

• Journal of Biomedical Engineering Research
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• v.26 no.6
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• pp.373-381
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• 2005

The respiratory and heart beat signals are the fundamental physiological signals for sleep monitoring in the home. Using the air mattress sensor system, the respiration and heart beat movements can be measured without any harness or sensor on the subject's body which makes long term measurement difficult and troublesome. The differential measurement technique between two air cells is adopted to enhance the sensitivity. The concept of the balancing tube between two air cells is suggested to increase the robustness against postural changes during the measurement period. With this balancing tube, the meaningful frequency range could be selected by the pneumatic filter method. The mathematical model for the air mattress and balancing tube was suggested and the validation experiments were performed for step and sinusoidal input. The results show that the balancing tube can eliminate the low frequency component between two cells effectively. This technique was applied to measure the respiration and heart beat on the bed, which shows the potential applications for sleep monitoring device in home. With the analysis of the waveform, respiration intervals and heart beat intervals were calculated and compared with the signal from conventional methods. The results show that the measurement from air mattress with balancing tube can be used for monitoring respiration and heart beat in various situations.

• Journal of the Korea Society of Computer and Information
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• v.29 no.3
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• pp.173-180
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• 2024

The purpose of this study was to determine the accuracy of chest compression according to the patient body weight and the rescuer's weight when performing chest compression on a cardiac arrest patient that occurred on a home bed. From January 07 to January 19, 2023, 36 paramedic students from N and S universities who completed the KBLS provider curriculum of the Korea Cardiopulmonary Resuscitation Association were measured at the subject's knee position, the depth of the mattress being pressed by the weight of the manikin, and the depth of the mattress being pressed by the weight of the manikin were measured during continuous chest compression for 2 minutes. As a result of the study, if a child's cardiac arrest is found at home, the patient is moved to the floor to proceed with chest compression, and the first witness to find an adult cardiac arrest is recommended to proceed on the bed rather than force the patient under the bed to proceed with chest compression.

• Journal of Physiology & Pathology in Korean Medicine
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• v.36 no.3
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• pp.89-93
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• 2022

Earthing, caused by direct skin contact with the Earth's surface, is used to reduce the symptoms of inflammation (fever, fever, swelling and pain). However, there is little evidence to support the anti-inflammatory effects of earthing mattresses. Therefore, this study was conducted to investigate whether anti-inflammatory effect of earthing mattress using an in vivo animal model. The anti - inflammatory effect was evaluated by measuring ear thickness and foot volume in 12-O-tetradecanoylphorbol-13 acetate (TPA) - induced ear edema and carrageenan - induced paw edema model, respectively. Balb/c mouse in carrageenan paw edema model showed significant anti - inflammatory effect in the group treated with earthing mattress for 4 hours or 24 hours for 3 days. For females, the anti-inflammatory effect was greater when the earthing mattress was added to the mattress than the mattress alone treatment. From the above results, it was found that the female responds more to the effect of the earthing as well as the mattress effect. In addition, when the male and female Balb/c mice were exposed to mattresses and earthing mattresses for 24 h for 3 days, respectively, the mattress and earthing mattresses showed significant inhibition of IL (Interleukin)-1β levels compared to the control. In the TPA ear edema model, Balb/c mouse showed significant anti - inflammatory effect in the group treated with the earthing mattress for 4 hours or 24 hours for 3 days. Both males and females showed more anti-inflammatory effects when they were exposed to earthing mattresses with mattresses added to the mattresses. From the above results, it was found that both male and female respond to the effect of earthing as well as the mattress effect in the TPA ear edema model. In conclusion, in this study, we have verified that earthing mattress shows inhibitory effects on TPA and carrageenan-induced inflammation. From these results, it is suggested that the anti-inflammatory effect can be expected by applying the earthing mattress to patients suffering from inflammatory diseases. However, there is a need to pinpoint exactly how the earthing mattress relieves inflammation, and further research is needed to investigate the mechanism.

• Proceedings of the KOSOMBE Conference
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• v.1995 no.05
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• pp.179-182
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• 1995

Although air, water, and noise pollutions have been widely recognized, electromagnetic forces(EMF) hazard has been rarely recognized as a pollution and very little studies has been done in this country. Thus, in this study electromagnetic forces radiated by various home appliances, once machines, and communication equipments were measured and so were several places radiating strong EMF such as subway stations and electric substations. Among the home appliances microwave oven senates lots of magnetic field and microwaves, and electric mattress does strong magnetic field. In video game room strong magnetic and considerable electric fields were measured. It was observed strong magnetic field inside of electric powered train and very strong magnetic and electric fields on some platforms. Hand-phone and car-phone radiate very hazardous level of microwaves to brain and that they rapidly come into wide use. In this study data base for various electric machines and places radiating strong EMFs were constructed and could be used for future epidemiological studies.

• Journal of the Korean Home Economics Association
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• v.46 no.4
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• pp.83-96
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• 2008

The purpose of this study is to grasp the opinion of Korean feminine seniors on the life support appliances for their healthy ageing: medication dispenser, video phone, activity monitor and sleep monitor. The focus group interviews, asking the usability of the appliances, were answered by each 6 feminine seniors of more than 65 years, residing in Corvallis of U.S.(group I), Cheongju(group II), and Ulsan(group III) of Korea. The results are as follows. (1) The medication dispenser proved to be very useful to all the respondents. All the seniors, who take more than one medicine a day, felt it helpful that the medication dispenser makes them to take medicines at fixed time. In addition, they hoped the medicine envelope to be developed for the dispenser use by the supply side. (2) The seniors showed interest in the manner the video phone works; to work by the voice, rather than by the finger. They expressed the hope of the video phone to display the communication contents, in consideration of their weakening hearing. (3) The seniors who live alone, especially, felt intimacy to the activity monitor, thinking as if some helpers were beside them. The fact that it can send emergency calls immediately when situations happen, gave the seniors emotional safety as a patron. (4) The sleep monitor, although essential to the serious cases without moving ability, was proved less necessary to the healthy seniors. They expressed the hope of this appliance to be evolved for the use with the mattress without bed.

• Journal of Korean Physical Therapy Science
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• v.16 no.3
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• pp.11-17
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• 2009

Background: The purpose of this study was designed to find out the effectiveness of reposition sense, muscle fatigue response on lumbar spine after apply lumbosacral stabilization exercise program to 4 patients with chronic low back pain and for 12 weeks. Method: In this study the reposition sense was measured in 3 angle(60, 30, 12) of the lumbar spine motion with blind by MedX test machine and the difference of instability to lumbar vertebra segments in flexion, extension test of standing position and spinal load test Mattress Test by Spinal Mouse. The stabilization exercise program was applied 2 times a week for 12 weeks in hospital and 2 times a day for 20 minutes at home. Result: The results of the present study were that the repositioning sense was appeared the most error in 12 angles of lumbar flexion and Men was appeared to decrease an error more than female in average value of 4 angles after 12 weeks. And average error of male was decrease more than female. Thus the effects of lumbosacral stabilization exercise was improved repositioning sense of prorioceptor. Fatigue response test(FRT) results, in male, was raised muscle fatigue rate during increase weight, on the other hand female appeared lower than male. Conclusion: As a results, lumbosacral stabilization exercise was aided to improvement of lumbar spine repositioning sense and vertebra segments stabilization. It was showed the rate of decrease in typically 12 degree angle point of each 3 angle(60, 36, 12). Especially, that spine instability patients will have a risk when in lifting a load or working with slight flexion posture around 12 degree during the daily of living life and it is probably to increase recurrence rate. Thus, not only lumbar extension muscle strength but also stability of vertebra segments in lumbar spine may be very important.

• Journal of Environmental Health Sciences
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• v.31 no.2 s.83
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• pp.120-126
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• 2005

To assess exposure of allergy patients to a biological environment, measurements were made of levels of airborne bacteria and fungi, house dust endotoxin and mite allergens in homes of 7 allergy patients and 12 healthy families. Concentrations of airborne total bacteria and the ratio of indoor and outdoor concentrations(I/O) in allergy patient's homes were high compared to non-allergy houses. But no significant differences could be shown for the concentration of spores of viable fungi and staphylococcus in indoor air between the homes of allergic patients and healthy families. The results of investigation on house dust mites, Dermatophagoids farinae were detected in all mattress samples and the levels in the allergy patient's homes were generally high, with individual measurements exceeding $2{\mu}g/g$ dust found in $30\%$ samples. In contrast with, Dermatophagoids pteronyssinus were detected in only $60\%$ samples and the concentrations were very low. The levels of endotoxin in dust samples collected from the allergy patient's home mattresses were higher than those of control houses. There was a positive correlation between the endotoxin levels and the house dust mite allergens.

• Parasites, Hosts and Diseases
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• v.46 no.3
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• pp.187-189
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• 2008

House dust mites produce inhalant allergens of importance to allergic patients, We measured the major group 1 allergens, Der p 1 and Der f 1, from the house dust mites Dermatophagoides pteronyssinus and Dermatophagoides farina, respectively in 100 randomly selected domestic homes from Cheonan, Korea, Dust samples were collected by vacuuming from the living room floor and 1 mattress in each home, Der p 1 and Der f 1 were measured by double mono-clonal ELISA. Der p 1 levels were very low, with geometric mean levels for floors and mattresses being $0.11\;{\mu}g/g$ (range: 0.01-4.05) and $0.14\;{\mu}g/g$ (range: 0.01-30.0), respectively. Corresponding levels of Der f 1 were higher, $7.46\;{\mu}g/g$ (range: 0.01-262.9) and $10.2\;{\mu}g/g$ (range: 0.01-230.9) for floors and mattresses, respectively. D. farinae appears to be the dominant house dust mite in Cheonan.

• Journal of Biomedical Engineering Research
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• v.16 no.2
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• pp.191-200
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• 1995

Although air, water, and noise pollutions have been widely recognized, electromagnetic forces (EMF) hazard has been rarely recognized as a pollution and very little studies has been done in this country. Thus, in this study electromagnetic forces radiated by various home appliances, office machines, and communication equipments were measured and so were several places radiating strong EMF such as subway stations and electric substations. Among the home appliances microwave oven radiates lots of magnetic field and microwaves, and electric mattress does strong magnetic field. In video game room strong magnetic and considerable electric fields were measured. It was observed strong magnetic field inside of electric powered train and very strong magnetic and electric fields on some platforms. Hand-phone and car-phone radiate very hazardous level of microwaves to brain and that they rapidly come into wide use. In this study data base for various electric machines and places radiating strong EMFs were constructed and could be used for future epidemiological studies.