• Title/Summary/Keyword: ${\beta}$ wave

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An Effect of Electromagnetic Wave on Human Body of Light Sensing (인체의 광인식에 미치는 전자파의 영향)

  • Yun, Jae-Hyun;Park, Hyung-Jun
    • Proceedings of the KIEE Conference
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    • 2004.11c
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    • pp.316-318
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    • 2004
  • In this study, the influence of electromagnetic wave effected on human body of light sensing was classified. Subjects of the eye was stimulated by the rays of LED and the measured electrical signals(EEG, EOG and ERG) in human body were compared and analyzed in the case of exposed at electromagnetic wave or not. The result show that when the subjects were not exposed at electromagnetic wave, the ratio of a wave has a large percentage in the EEG signal and the ratio of $\beta$ wave has come to good.

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An effect of electromagnetic wave on visual activity (시각활동에 미치는 전자파의 영향)

  • Kim, Ki-Young;Lee, Seung-Ju;Yoon, Chae-Hyun;Lee, Hyun-Chul;Park, Choon-Bae;Park, Hyung-Jun
    • Proceedings of the KIEE Conference
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    • 2002.07d
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    • pp.2724-2726
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    • 2002
  • The effect which electromagnetic wave has influence on visual activity of human, was investigated in this study. The EEG and the EOG generated by the rays of LED were measured in shield room when the subject were exposed at electromagnetic wave(820MHz, 2mV) or not exposed. Each component of the EEG was compared and evaluated on being exposed at electromagnetic wave or not. As a result was $\alpha$ wave was represented relatively low level in the case of exposed at electromagnetic wave and $\beta$ wave was represented relatively low level in the case of not exposed.

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A Study on Discrimination Sensitivity between EEG Patterns under IAPS(International Affective Picture System) Stimuli (시각 감성평가를 위한 뇌파의 민감성에 대한 연구)

  • Hwang, Min-Cheol;Ryu, Eun-Gyeong;Kim, Cheol-Jung
    • Journal of the Ergonomics Society of Korea
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    • v.17 no.1
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    • pp.1-9
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    • 1998
  • The sensitivity of the emotion evoked visually by IAPS was attempted to be defined using EEG(electroencephalogram). Twenty university students were participated in this study. Their EEG was measured and analyzed in terms of frequency range such as delta, theta, alpha and beta wave. The results showed that alpha increased, but delta and beta decreased with positive emotional progress. Inter-variation between alpha and delta in F4 and beta variation in P3 were indicative of the evaluation sensitivity of human emotion.

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Brain-Waves Analysis according to Ego-state and OK-gram of Transactional Analysis Theory (교류분석이론의 자아상태와 인생태도에 따른 뇌파 분석)

  • Jeong, Cheon-Soo;Kim, Jung-Sam;Kim, Chong-Yeal
    • The Journal of the Korea Contents Association
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    • v.14 no.11
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    • pp.858-863
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    • 2014
  • Through this study, we found out whether to measure objectively by using Transactional Analysis(TA) evaluating their own growth and benefit of health through the change of Ego-state, the personality structure and brain waves monitoring electric signals occurring in the brain of the human biological signals. According to the results of brain-wave test, M-type is brain-waves of healthy adults and a, ${\beta}$ were dominantly observed in the occipital while not sleeping. In particular, ${\beta}$ appears widely throughout the brain during nervous or concentrating metal activities and unlike N-type experimenters, ${\beta}$ was found to be dominant in M-type experimenters even in stable condition. N-type is brain waves of healthy adults and a, ${\beta}$ were dominantly observed in the occipital while not sleeping. In particular, unlike nervous or concentrating M-type, there was no noise such as tension and blink while resting. In addition, it turned out that subjects with high levels of A ego do not return quickly to the stable state and show a lot of Blinking and swallowing saliva, noise regardless of the pattern of Egogram. And brain waves of 11 people that the difference in data of OK-gram and Ego-state is the same in all items or less than -5 showed a low amplitude of $20{\mu}V$ in general. In conclusion, this study identified that the theory of personality pattern of Transactional Analysis Theory and brain-wave findings are consistent and also found out that brain waves are also associated according to each Ego-state of Egogram.

Changes of the Prefrontal EEG(Electroencephalogram) Activities according to the Repetition of Audio-Visual Learning (시청각 학습의 반복 수행에 따른 전두부의 뇌파 활성도 변화)

  • Kim, Yong-Jin;Chang, Nam-Kee
    • Journal of The Korean Association For Science Education
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    • v.21 no.3
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    • pp.516-528
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    • 2001
  • In the educational study, the measure of EEG(brain waves) can be useful method to study the functioning state of brain during learning behaviour. This study investigated the changes of neuronal response according to four times repetition of audio-visual learning. EEG data at the prefrontal$(Fp_{1},Fp_{2})$ were obtained from twenty subjects at the 8th grade, and analysed quantitatively using FFT(fast Fourier transform) program. The results were as follows: 1) In the first audio-visual learning, the activities of $\beta_{2}(20-30Hz)$ and $\beta_{1}(14-19Hz)$ waves increased highly, but the activities of $\theta(4-7Hz)$ and $\alpha$ (8-13Hz) waves decreased compared with the base lines. 2). According to the repetitive audio-visual learning, the activities of $\beta_{2}$ and $\beta_{1}$ waves decreased gradually after the 1st repetitive learning. And, the activity of $\beta_{2}$ wave had the higher change than that of $\beta_{1}$ wave. 3). The activity of $\alpha$ wave decreased smoothly according to the repetitive audio-visual learning, and the activity of $\theta$ wave decreased radically after twice repetitive learning. 4). $\beta$ and $\theta$ waves together showed high activities in the 2nd audio-visual learning(once repetition), and the learning achievement increased highly after the 2nd learning. 5). The right prefrontal$(Fp_{2})$ showed higher activation than the left$(Fp_{1})$ in the first audio-visual learning. However, there were not significant differences between the right and the left prefrontal EEG activities in the repetitive audio-visual learning. Based on these findings, we can conclude that the habituation of neuronal response shows up in the repetitive audio-visual learning and brain hemisphericity can be changed by learning experiences. In addition, it is suggested once repetition of audio-visual learning be effective on the improvement of the learning achievement and on the activation of the brain function.

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Response State of EEG Wave Type on Visual Cortex According to Color Vision Target (색각 시표에 따른 시피질 뇌파의 반응 상태)

  • Kim, Douk Hoon
    • Journal of Korean Ophthalmic Optics Society
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    • v.5 no.2
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    • pp.5-9
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    • 2000
  • The visual evoked potential was electrophysiological method for the identify of the EEG response on visual cortex. This test was objective test method on the eye function. This study was used the visual evoked potential for the objective color test. The subjects was a normal color function in Korean adults. The test condition was performed on the differens distance and illumination. According to convergence condition of color vision target. On the appearance of EEG wave of visual stimulation on visual cortex. The most EEG wave style was delta wave, and the next amount wave form was beta wave and theta wave, and the least EEG wave form was alpha wave. The histogram of amplitude of EEG wave form was almost non-Gaussian shape, and the phase diagram of amplitude was almost all linear shape. On the kinds of color vision target, the frequency of EEG wave style appeared a similar results.

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Effect of Electroacupuncture at GB14 on Brain Activity (양백(GB14) 전침자극이 뇌파 변화에 미치는 영향)

  • Kang, Tae-Ri
    • Korean Journal of Acupuncture
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    • v.36 no.4
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    • pp.241-251
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    • 2019
  • Objectives : The purpose of this study was to examine the effects of electroacupuncture at GB14, on brain activity assessed on an electroencephalogram(EEG). Methods : (1) Thirty-four healthy participants were randomly divided into two groups, receiving either real acupuncture or non-penetrating sham acupuncture at GB14. (2) EEG measurements were conducted simultaneously before and after a 5-minute electroacupuncture stimulation, and the differences in the resulting EEG parameters were compared between the test and control groups. Results : (1) Absolute power increased significantly in the theta-wave channel of the occipital region and in the entire alpha-wave channel. (2) Relative power decreased significantly in the theta-wave channels of the frontal and occipital regions. (3) Coherence decreased significantly in the theta- and beta-wave channels of the parietal and occipital regions, and increased significantly in the alpha-wave channels of most areas. Conclusions : This study shows that electroacupuncture stimulation at GB14 activates the alpha frequency band in particular.

Measurement-Based Propagation Channel Characteristics for Millimeter-Wave 5G Giga Communication Systems

  • Lee, Juyul;Liang, Jinyi;Kim, Myung-Don;Park, Jae-Joon;Park, Bonghyuk;Chung, Hyun Kyu
    • ETRI Journal
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    • v.38 no.6
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    • pp.1031-1041
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    • 2016
  • This paper presents millimeter-wave (mmWave) propagation characteristics and channel model parameters including path loss, delay, and angular properties based on 28 GHz and 38 GHz field measurement data. We conducted measurement campaigns in both outdoor and indoor at the best potential hotspots. In particular, the model parameters are compared to sub-6 GHz parameters, and system design issues are considered for mmWave 5G Giga communications. For path loss modeling, we derived parameters for both the close-in free space model and the alpha-beta-gamma model. For multipath models, we extracted delay and angular dispersion characteristics including clustering results.

Drift Motion Analyses for a FPSO with Spread Mooring Systems (다점 계류된 원유 저장선에 대한 표류 운동 해석)

  • 이호영;임춘규;신현경
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2001.05a
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    • pp.222-227
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    • 2001
  • The time simulation of slow drift motions of moored FPSO in waves is presented. The equation of motion based on Cummin's theory of impulse responses are employed, and are consisted of horizonal plane -surge, sway and yaw. The added mass coefficients, wave damping coefficients, first order wave exciting forces and the second order wave drift forces involved in the equations are obtained from a three-dimensional panel method in the frequency domain. The mooring lines are modeled quasistatically as catenary for chains and touchdown. As for numerical example, time domain analyses are carried out for a box-type FPSO in long crest irregular wave condition.

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Numerical calculation and experiment of a heaving-buoy wave energy converter with a latching control

  • Kim, Jeongrok;Cho, Il-Hyoung;Kim, Moo-Hyun
    • Ocean Systems Engineering
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    • v.9 no.1
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    • pp.1-19
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    • 2019
  • Latching control was applied to a Wave Energy Converter (WEC) buoy with direct linear electric Power Take-Off (PTO) systems oscillating in heave direction in waves. The equation of the motion of the WEC buoy in the time-domain is characterized by the wave exciting, hydrostatic, radiation forces and by several damping forces (PTO, brake, and viscous). By applying numerical schemes, such as the semi-analytical and Newmark ${\beta}$ methods, the time series of the heave motion and velocity, and the corresponding extracted power may be obtained. The numerical prediction with the latching control is in accordance with the experimental results from the systematic 1:10-model test in a wave tank at Seoul National University. It was found that the extraction of wave energy may be improved by applying latching control to the WEC, which particularly affects waves longer than the resonant period.