• Journal of Korean Physical Therapy Science
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• v.9 no.4
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• pp.105-112
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• 2002

When any damage or disease occurs, muscular strength and muscular endurance are lowered, and thus, if one is able to be restored from the damage or the disease, appropriate stimulus is required, since the muscles have to restore their proper functions. For such stimulus, the way of exercising and the way using electric stimulus are used in physical therapy. In order to examine the change in muscular strength, muscular endurance and girth of limbs for Biceps brachii, according to the lands of stimulus, in this article a total of 42 healthy male and female adults in their twenties were randomly sampled, and a series of tests were conducted for 6 weeks, for 15 minutes per once, 3 times per week, respectively, dividing them into the group for RUS(Russian Current Stimulation), PRE(Progressive Resistive Exercise) and P+R(RUS + PRE). The findings showed that the change in muscular strength was most significant as for the group for P+R, since it increased from $62.12{\pm}25.30$ before experiment to $95.78{\pm}34.07$ after 6 weeks: the change in muscular endurance was most significant as for the group for P+R, since it increased from $17.57{\pm}6.63$ to $42.86{\pm}10.24$; and the change in the girth of limbs was slightly significant only in the group for P+R, and the remaining two groups showed no significance.

• Journal of Biomedical Engineering Research
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• v.28 no.2
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• pp.212-217
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• 2007

As a preliminary study for the development of electrical stimulation strategy of artificial retina, we set up a method fur the reconstruction of input intensity variation from retinal ganglion cell(RGC) responses. In order to estimate light intensity variation, we used an optimal linear filter trained from given stimulus intensity variation and multiple single unit spike trains from RGCs. By applying ON/OFF stimulation(ON duration: 2 sec, OFF duration: 5 sec) repetitively, we identified three functional types of ganglion cells according to when they respond to the ON/OFF stimulus actively: ON cell, OFF cell, and ON-OFF cell. Experiments were also performed using a Gaussian random stimulus and a binary random stimulus. The input intensity was updated once every 90 msec(i. e. 11 Hz) to present the stimulus. The result of reconstructing 11 Hz Gaussian and binary random stimulus was not satisfactory and showed low correlation between the original and reconstructed stimulus. In the case of ON/OFF stimulus in which temporal variation is slow, successful reconstruction was achieved and the correlation coefficient was as high as 0.8.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.04b
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• pp.139-142
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• 2000

Displacement current was generated in the light stimulus. Solution of azobenzene molecules (8A5H) have to character trans-to-cis. The Maxwell displacement current measuring technique has been applied for the investigation of azobenzene organic thin films under alternating photoirradiation with ultraviolet($\lambda_1$) and visible($\lambda_2$) light. also, As laser beam(630~670nm) investigate light response. As result, ultraviolet($\lambda_1$) and visible($\lambda_2$) light see photoisomerization response, but laser beam not appear photoisomerization in current that differ wave range reagent.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.12
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• pp.2827-2835
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• 2010

When the inferiorthreshold potential is applied on the membrane, the resting status membrane does not display any specific reaction, in the meanwhile if it receives somewhat higher voltages then it shows entirely different configuration. The fact that there is this kind of characteristics on the exciting membrane has been known for a long time, and some researchers have tried to analyze this situation using the electrical circuits but only limitted to inferiorthreshold potential case. The quantitative studies of especially for transthreshold stimulus is extremely rare up to now. The direct application of electrical circuit to biostatus is somewhat uneasonable because there may be much differences between them. We studied the electrical reaction quantitatively of biomembrane when it receives the transthreshold stimulus in point of electricity in this paper.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2004.05c
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• pp.9-13
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• 2004

In this paper, evaluation of physical properties about dielectric relaxation phenomena by the detection of the surface pressures and displacements current on the monolayer films of phospolipid monomolecular DLPC, DMPC using pressure stimulus. As a result, the changed surface pressure, displacement current and the transition forms of dipole moment of phospolipid monomolecular in area per molecular by pressure stimulus were conformed well. It was known that the monolayers by linear relationship for decision of dielectric relaxation time between compressure speed and molecule area By according to the linear relationship relation get that frictional constant, DLPC was $1.89{\times}10^{-19}$[Js] and DMPC was $0.722{\times}10^{-19}$[Js]. It is found that the phospolipid monolayer of dielectric relaxation takes a little time and depend on the molecular area.

• Journal of Biomedical Engineering Research
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• v.2 no.2
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• pp.127-140
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• 1981

This paper describes the mechanism of information processing in the nervous system through neuron pool model which is consisted of six single neural models. In the neuron pool model, summation characteristic of stimulus satisfies those of real nervous system and output impulse rate increases linearly to the input stimulus. Occlusion phenomena of the neuron pool model is approached to those of real nervous system and also if the threshold potential within sutlirninal fringe is increased, facilitation phenomena appreared. Therefore, the results of this study suggest that we can construct large neuron pool with many single neural models and verify the mechanism of information processing in the wide part of nervous system.

• Proceedings of the KIEE Conference
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• 2000.11c
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• pp.470-472
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• 2000

In this paper generation from of displacement current was compared and measured with light stimulus induce monolayers which 8A5H with azobenzene and arac.acid mixed. Light response of two monolayers which dynamics behavior are different was compared and measured though they are the same isomer The experimental results are as following; In the case of light stimulus mixed monolayers reacted less than 845H about 5[fA]. This is the mason molecule dynamic behaviour and trans was not activated due to its very chain length.

• The Korean Journal of Physiology and Pharmacology
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• v.19 no.2
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• pp.167-175
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• 2015

A retinal prosthesis is being developed for the restoration of vision in patients with retinitis pigmentosa (RP) and age-related macular degeneration (AMD). Determining optimal electrical stimulation parameters for the prosthesis is one of the most important elements for the development of a viable retinal prosthesis. Here, we investigated the effects of different charge-balanced biphasic pulses with regard to their effectiveness in evoking retinal ganglion cell (RGC) responses. Retinal degeneration (rd1) mice were used (n=17). From the ex-vivo retinal preparation, retinal patches were placed ganglion cell layer down onto an $8{\times}8$ multielectrode array (MEA) and RGC responses were recorded while applying electrical stimuli. For asymmetric pulses, 1st phase of the pulse is the same with symmetric pulse but the amplitude of 2nd phase of the pulse is less than $10{\mu}A$ and charge balanced condition is satisfied by lengthening the duration of the pulse. For intensities (or duration) modulation, duration (or amplitude) of the pulse was fixed to $500{\mu}s$($30{\mu}A$), changing the intensities (or duration) from 2 to $60{\mu}A$(60 to $1000{\mu}s$). RGCs were classified as response-positive when PSTH showed multiple (3~4) peaks within 400 ms post stimulus and the number of spikes was at least 30% more than that for the immediate pre-stimulus 400 ms period. RGC responses were well modulated both with anodic and cathodic phase-1st biphasic pulses. Cathodic phase-1st pulses produced significantly better modulation of RGC activity than anodic phase-1st pulses regardless of symmetry of the pulse.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.44 no.2 s.314
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• pp.46-54
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• 2007

In current printer industry, four or more colorants are added for color gamut extension because the gamut of printer is smaller than other devices. However, these additional colorants make a redundancy problem that several combinations of colorants reproduced same color stimulus in colorimetric inverse characterization process. Thus, we propose a method of colorimetric inverse characterization using color correlation between colorant's amount. First, for analyzing the combination of colorants which represent the same color stimulus, we estimate the color stimulus for all combination of colorants by Cellular Yule-Nielsen Spectral Neugebauer printer model. The combination of colorants which has higher color correlation factor comparing combinations of colorant around itself in color space is selected. It can reduced the color difference from the tetrahedral interpolation process which is estimation of the output value(colorants combination) for arbitrary input(color stimulus). The selected combinations of colorants and their color stimulus are stored to the lookup table. In experiment, the CMYKGO printer was used. As a result, the dark region of color gamut was extended and the color tone was more naturally represented.

• Proceedings of the IEEK Conference
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• 2003.07c
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• pp.2923-2926
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• 2003

In this paper, a swallowable miniaturized capsule, which applicable for electrical stimulation of digestive organ to improve the motion of intestine in research purpose, is proposed and implemented. The developed capsule can be controlled for the behavior of the power on/off, amplitude and pulse rate for the patient stimulus, by internally equipped with miniaturized RF receiver that linked by the command of external transmitter The experimental result of the implemented miniaturized capsule in the animal intestine show the ability of effective control for the stimulus parameters.