• Korean Journal of Optics and Photonics
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• v.25 no.4
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• pp.193-199
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• 2014

The net effect of the emitter orientation, Mie scatters, and pillow lenses on the outcoupling efficiency (OCE) of a bottom-emitting OLED having an internal photonic crystal layer was investigated by a combined optical simulation based on the finite-difference time-domain method (FDTD) and the ray-tracing technique. The simulation showed that when the emitter orientation was horizontal with respect to the OLED surface, the OCE could be increased by 54% when a photonic crystal layer was employed, while it could be improved by 86% under optimized conditions of Mie scatters and pillow lenses applied to the glass substrate. The peculiar intensity distribution of the OLED, caused by the periodic lattice structure of the photonic crystal layer, could be ameliorated by inserting Mie scatters into the glass substrate. This study suggests that conventional outcoupling structures combined with control of the emitter orientation could improve the OCE substantially.

• Progress in Medical Physics
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• v.24 no.1
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• pp.54-60
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• 2013

The aim of this study was to analysis of the pitch and yaw deviations with or without using an aid-pillow for the head and neck cancer on the TomoTherapy. A total of 14 head and neck patients were selected to without-group (n=7) and with-group (n=7). A total of 333 MVCT image sets used to evaluate the translational (lateral, longitudinal and vertical) and rotational adjustments (pitch, roll and yaw) with 153 and 180 MVCT image sets at without- and with-group, respectively. Deviations of without- and with-groups were $0.12^{\circ}$ and $0.09^{\circ}$, respectively at pitch. And, deviations without- and with-groups were $0.47^{\circ}$ and $0.17^{\circ}$, respectively at yaw. In generally, with-group had reduced than without-group for the pitch and yaw deviations. Therefore, using an aid-pillow, it will able to increase the reproducibility of treatment for the head and neck cancer patients on the TomoTherapy.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2013.05a
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• pp.1645-1646
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• 2013

• Journal of the Optical Society of Korea
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• v.17 no.3
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• pp.269-274
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• 2013

The effect of diffusing substrate and pillow lenses on the outcoupling efficiency of organic light-emitting diodes (OLEDs) was studied by optical simulation based on the point-dipole model. The diffusing substrate included Mie scatterers by which the condition of total internal reflection could be broken. The finite-difference time-domain method was used to obtain the intensity distribution on the transparent electrode of an OLED, which was used as a light source to carry out a ray-tracing simulation of the OLED and the diffusing substrate. It was found that the outcoupling efficiency of the OLED was sensitive to the thickness of organic layers and could be increased by 21.0% by adopting a diffusing substrate in which Mie scatterers whose radius was $2.0{\mu}m$ were included at the density of $10^7mm^{-3}$ and by 65.5% by forming one pillow lens with the radius of 2 mm on the front surface of the glass substrate. This study revealed that the outcoupling efficiency could be improved by adopting diffusing substrate and pillow lenses along with the optimization of the thickness of each layer in the OLED.

• Journal of the Korean Home Economics Association
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• v.23 no.2
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• pp.21-28
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• 1985

This study is to furnish basic data for making appropriate and comfortable pillow. This research was carried out in reference to 260 males and 339 females whose ages are above 20 in Daegu, from Aug. 1. 1984 to Oct. 15. 1984. RESULTS : 1. In the shape of pillow, the western style is more used than Korean style. 2. The mean size, 50.9$\times$29.1 cm, of pillows is too small for the preceding studies of which, the most comfortable size is 65$\times$45 cm. 3. The mean height, 10.1 cm, of pillows is much higher than the appropriate height, 5.0$\pm$1cm, in the preceding studies. 4. The mean weight, 1587g, of pillows seems to be too heavy. 5. The most used stuffing of pillows is fascicular fibers, the second chaff, the third husks of buckweat, the fourth sponge, and then feather, 6. Considering of pillow-slip material, 68.8% of pillows consist o synthetic fiber.7. The mean compression rate 14.5% is much lower than the comfortable compression rate 40~50 in the preceding studies. 8. Considering the way obtainment, ready-made articles are more used than the domestic-made articles. 9. The same pillows are used throughout for seasons, and that seems not to be appropriate because climate is changeable according to seasons in our country. 10. The sterilization by sunlight is rarely carried out and that is unhygienic because pillows used to absord much of sweat during using time.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.1101-1102
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• 2008

In this paper, we have developed PPG pillow system for unconstrained respiration monitoring during sleep. The system employs a pillow containing a PPG sensor and a simple respiration extraction algorithm. The results showed that the extracted respiratory rhythm was found to have close relations with the reference signal. The system has an advantage of processing simplicity. A follow-up study should be performed to evaluate the system in terms of breath intake.

• The Journal of the Korea Contents Association
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• v.14 no.3
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• pp.80-93
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• 2014

This paper examines how split-screen technique works to meet the goals and strategies of the narrative in the romantic comedy films which deal with love and sex. The plot of romantic comedy films aims to the union and marriage of the couple, but is structured to delay the union as much as possible through comical situations and episodes. Usually split-screen scenes are placed before plot point 2 and serve to make a laugh and humor. Besides, it helps focusing on two main characters. Comedy related to love and sex comes from information gap between two main characters which can cause a tension, double meaning of spoken words and combination of split-screen images. Michael Gordon's Pillow Talk(1959) and Peyton Reed's Down with Love(2003) are reviewed in this study.

• The Journal of the Korea institute of electronic communication sciences
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• v.15 no.3
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• pp.603-610
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• 2020

The sleep measurement system is important to detect sleep disturbances as early as possible to be diagnosed and treat the diseases quickly. This paper presents design of system to measure the quality of sleep by using nine accelerometer sensors embedded in the pillow to detect the acceleration of limb movement, e.g. head movements. The participants were asked to sleep using a smart pillow for five days. While sleeping, participants are recorded using a camera on a computer. After awakening, participants were asked to fill out a post-sleep questionnaire. Spearman's correlation was performed to test the correlation of gross body movement per minute rate with post-sleep questionnaire questions. Finally, the seven score of sleep quality were tested with gross body movement per minute rate. The result is the higher gross body movement per minute during sleep represented lower sleep quality.

• Journal of the Korea Convergence Society
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• v.11 no.1
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• pp.33-39
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• 2020

Specialists have developed pillows that take into account sleep science and ergonomics, such as comfort for lying on your side. This pillow is made of natural latex material, and improved resilience after a certain period of time. A new idea was added to the pillow, which was naturally used for sleep, but could it add additional features for health care. Here, health care targets sleep apnea, which is known to be associated with serious illness. The purpose of this paper is to design a comprehensive service that uses a pressure sensor and a voice sensor to obtain information and to identify abnormal symptoms related to diseases from this information and to refer them to a specialist. It also covers the basic design and implementation to confirm the success of this system. Based on this design, the information obtained will be converted into a DB, and a server system for consultation with a specialist will be completed to upgrade the role of assistive health devices for sleep apnea.

• Journal of Biomedical Engineering Research
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• v.39 no.1
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• pp.55-61
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• 2018

The purpose of this study was to investigate the effect of a pillow simulated with cranial sacral therapy (CST) on sleep induction using electroencephalography (EEG). This study included 12 voluntary participants divided into experimental group (CST group) and control group (Non-CST group) to observe EEG changes. The position of the electrode for EEG measurement consists of 8 channels electrodes (Fp1, Fp2, F3, F4, T3, T4, P3 and P4). In this study, we measured the fall asleep time, change of brain activity and sleep wave ratio using EEG wave (${\delta}$, ${\theta}$, ${\alpha}$, ${\beta}$ and ${\gamma}$). As a result, the mean fall asleep time of the experimental group was shorter than that of the control group significantly (p < 0.001). Also in comparison with the control group, both the delta (d) and theta (q) wave corresponding to the slow waves showed a larger increase and the alpha (a) wave showed a larger decrease significantly. The slow waves of experimental group showed a higher rate of significant increase than the control group (p < 0.001). Therefore this study showed that pillow based on CST had an effective in improving sleep induction and quality.