• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2004.05a
• /
• pp.294-294
• /
• 2004

최근 평균수명의 연장에 따른 사회 노년층의 증가로 낙상사고의 빈도가 높아지고 있으며, 또한 교통사고 발생이 빈번함에 따라 전정계 이상 및 체성감각계의 기능 손상에 의한 자세균형 환자가 점점 증가하고 있는 추세이며, 이러한 균형 제어력의 소실이 환자의 재활치료에 많은 어려움을 초래하고 있다. 자세균형제어에 관한 연구는 주로 힘판을 이용하여 특정 감각시스템으로부터의 입력을 제한하거나 외력에 의해 평형 유지를 방해했을 때, 신체 전이(displacement), 압력중심의 움직임(Center Of Pressure; COP), 자세 유지 시 작용하는 근육의 활동전위 등을 측정하는 연구와 더불어 균형에 어려움을 느끼는 환자를 위한 바이오피드백(Biofeedback)을 적용한 연구가 보고되고 있다.(중략)

• The Journal of the Korea Contents Association
• /
• v.18 no.8
• /
• pp.586-593
• /
• 2018

When newsreel was organized in 1967, it was a small but strong revolution. New York newsreel became the third world newsreel in 1972. The third world newsreel clearly stated that the purpose of the organization should be the alternative provision of the Television news. They also notified the revolution of the production system and the distribution system. Christine Choy who actively worked at the Third world newsreel succeeded the spirit of the organization through her works. Through the third world newsreel and Christine Choy who was the representative of the organization, this article is dealing with the mode of production and the style and the aesthetics of the Newsreel. Their activities were originally political and always controversial. They agonized who should be the film maker, how should be the distribution system. Through the strong arguments, the group had acquired not only collective identity but also collective production. Those collaborations had become the foundation of their works. Christine Choy has been a key figure of the Third world newsreel and her films has focused on the racial problem and gender problem. Her works have always been political and historical.

• Journal of the Korean Chemical Society
• /
• v.20 no.6
• /
• pp.486-493
• /
• 1976

The PVC mixed silver iodide pellet was prepared by means of the Infrared Pellet presser and the pellet was used as an indicating membrane electrode, to measure the potentials for various silver ion activities, ranging from $10^{-1}$ to $10^{-6}$ M. The potential responses to silver ion activities were linear and the slope was much close to Nernstian relation as compared with that of the pure silver iodide pellet membrane electrode and the PVC coated silver iodide pellet membrane electrode. The mechanical property and chemical durability of this electrode were found much better than the others. This electrode did not show significant response to the other except silver ion, but had good response to halide ions, i.e., iodide, chloride, bromide and cyanide ions, in the concentration range $10^{-1}$ to $10^{-6}$ M. This electrode could be used as an indicating electrode in potentiometric titrations of single halide ion and also halide mixture with standard solution of silver nitrate.

• Journal of Biomedical Engineering Research
• /
• v.21 no.6
• /
• pp.543-549
• /
• 2000

위전도(Electrogastrography, EGG)는 복부에 전극을 부착하여 위에서 발생하는 위 근육의 전기적인 활동성(gastric electrical activity)을 측정하는 방법으로, 비관혈적이며 다른 검사에 비해 측정비용이 적게 든다. 그러나 위전도 신호는 주파수가 매우 낮으며(0.2~10cpm) 진폭이 매우 작기(10~100 $\mu$V) 때문에 측정에 어려움이 있으며, 분석이 어려워 아직까지 위전도 신호해석에 대한 이론이 정립되어 있지않다. 본 연구에서는 running spectrum 분석을 이용한 4채널 위전도 시스템을 개발하여 위에서 발생하는 활동전위를 측정하였다. 본 연구에서 개발한 4채널 위전도 시스템의 4개 채널 중 가장 3 cpm 백분율이 높은 베스트 채널과, 상용화된 1채널 시스템인 Digitrapper EGG와 같은 전극부착 위치인 채널 1의 3 cpm 백분율을 비교하였다. 베스트 채널과 채널 1의 식전 평균 3 cpm 백분율은 각각 89.5%와 83.2%이었으며 통계적으로 유의하였다(p〈0.001). 식후에는 평균 3 cpm 백분율이 각각 90.4%와 76.5%이었으며 통계적으로 유의하였다(p〈0.001). 결론적으로 1채널위전도 측정기로서는 각 개인의 다양한 위의 위치를 커버할 수 없으며 그에 따른 오진을 초래할 수도 있으므로 1채널 위전도 측정기보다 4채널 위전도 측정기가 더 우수하다는 것을 확인하였다.

• Clinical and Experimental Pediatrics
• /
• v.50 no.6
• /
• pp.585-587
• /
• 2007

Peroneal neuropathy presenting at birth is a rare disorder. Although neonatal mononeuropathies may be related to obstetrical complications, prenatal mechanisms should be also considered. We describe an infant who was born at term by cesarean section due to breech presentation with a unilateral footdrop. Lack of compound muscle action potential in the peroneal nerve and denervation potentials confined to the tibialis anterior and the extensor hallucis longus muscles in the electrophysiological studies on the fourth day of life strongly suggest an isolated peroneal neuropathy of intrauterine onset. Early and sequential electrodiagnostic studies will be important to provide better temporal and pathophysiologic definitions, the better timing of onset and prognosis for mononeuropathies presenting in newborn infants.

• The KIPS Transactions:PartB
• /
• v.9B no.1
• /
• pp.35-46
• /
• 2002

The EEG is a time series of electrical potentials representing the sum of a very large number of neuronal dendrite potentials in the brain. The collective dynamic behavior of neural mass of different brain structures can be assessed from EEG with depth electrodes measurements at regular time intervals. In recent years, the theory of nonlinear dynamics has developed methods for quantitative analysis of brain function. In this paper, we considered it is reasonable or not for ICA apply to EEG analysis. Then we applied ICA to EEG for big toe movement and separated the independent components for 15 samples. The strength of each independent component can be represented on the topological map. We represented ICA can be applied for time and spatial analysis of EEG.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.7 no.4
• /
• pp.353-362
• /
• 1996

In this paper, SAR distribution is calculated according to the rabbit's head using approximation of its medium three layers model. Our experiment was classified 5 groups dependent on the power intensity of 2,450MHz microwave to measure EEG(Electroencephalograph) of rabbit, which was checked in left frontal lobe before and after irradiation of microwave. In results, mean total power of EEG was slightly decreased and mean composition percentages of $\theta$, $\delta$ and $\beta$ wave were increased after irradiation in observation. It means to decrease of elect- rophysiologic activity and trend of fast wave in brain after irradiation of its microwave. We analyzed the electrophysiological effect of the biobody quantitatively using measured EEG and estimated MPE (Maximum Permissible Exposure).

• Resources Recycling
• /
• v.17 no.6
• /
• pp.17-23
• /
• 2008

In order to simulate the leaching solution of copper sulfide ore in $FeCl_3$ solutions, synthetic solutions with composition of $FeCl_3$-$FeCl_2$-$CuCl_2$-CuCl-NaCl-HCl-$H_2O$ were prepared. The concentration of iron and copper chloride was varied from 0.1 to 1 m in synthetic solutions. The effect of composition on the mixed solution pH and potential at $25^{\circ}C$ was measured. When HCl concentration was constant, the increase of CuCl concentration increased solution pH. The increase of other solutes excluding HCl and CuCl decreased solution pH owing to the increase of the activity coefficient of hydrogen ion. A high CuCl concentration favored the redox equilibrium in the direction of Cu(I), while $FeCl_3$ had the opposite effect.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.8 no.3
• /
• pp.670-678
• /
• 2004

In oriental medicine, meridian is pathway of bio-energy, and basic an object of diagnosis/therapy. But, in western medicine, meridian has been accepted as action pathway of nerve-endocrine-immune system. Acupuncture effect has been regarded as not effect by transmission of bio-energy but action or response by stimulation. In this paper, when an acupuncturist's bio-energy is passed on(non-insulation) and when is not(insulation), we analysed electric potential on meridian/non-meridian to verify effect of acupuncture therapy. In the results, when bio-energy isn't passed on, bio-potential is reacted to only the first of 4 times acupuncture operating. But when bio-energy is passed on, it is reacted to 4 times, and potential on meridian is higher than that of on non-meridian. Electric potential for same acupuncture operating is different on non/meridians, which implies that physiological construction and bio-energy transmission material is different respectively. When is extracting acupuncture method, potential is higher than that of injection one. It implies that extracting method is more effect than injecting one, in aspect of acupuncture therapy effect. Therefore, acupuncture therapy effect is verified as effect of response by acupuncturist's bio-energy transmission rather than that by only acupuncture stimulus.

• Progress in Medical Physics
• /
• v.18 no.2
• /
• pp.73-80
• /
• 2007

Fruitful findings have been produced from five out of sixty cells which were obtained from each 63 individual Aplisia caught at the Jeju coast. Spiking patterns of three out of five cells, such as relaxation oscillator, bursting within a short time of the inter-burst interval, chaotic bursting, period doubling sequences, bursting with long trains of action potentials separated by short silent periods, regular repeated beating or elliptic bursting, and silent states had been changed in order as the temperature was lowered to $10^{\circ}C\;from\;32^{\circ}C$. In the intervals of every about 40 minutes repeated ups and downs of temperature produced similar firing patterns at the allowable temperature ranges. The other two cells showed difference from these. The amplitudes of the action potentials of the two cells will not be highly decreased in 24 hours. Average spike frequencies, the inter-burst interval, peak to peak spike amplitude of action potentials, minimum potential values are compared and analyzed by using the computer programme. The spike frequencies according to temperature show the distribution of bell type, with maximal spike frequencies at intermediate temperatures and minimal ones at either end. The most common pattern consist of high spike frequency during failing and low one during rising temperatures.