• Proceedings of the KIPE Conference
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• 2016.07a
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• pp.255-256
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• 2016

This paper is presents a initial starting of SST with high voltage level source. Rush current flowing as difference between capacitor level and grid level can crush the whole system. Thus, industries have used initial constituted by resistance and relay. However the initial circuit used in industries can't apply high voltage application due to isolation and economic feasible problems. Therefore many countries study method can charge capacitor with another voltage sources. Also this paper introduce method charging primary side capacitor efficiently.

• Korean Journal of Acupuncture
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• v.25 no.2
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• pp.33-41
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• 2008

Objectives : The aim of this study was to understand electro-physiological peculiarity in meridian and acupoints, and understand acupuncture therapy mechanism as an electro-physiological viewpoints. Methods : I reviewed the articles on the electro-physiological peculiarity of the meridian and acupoints Results and Conclusions : It has been reported that meridian and acupoints have high-electrical conductivity and row-electrical resistance. On this scientific basis, to understand the mechanism of acupuncture therapy, I made some hypotheses. At first, there is electro-property in meridian and acupoint. The second, energy flowing in meridian is related with electro-property. The third, there is electronic interaction between practitioner of acupuncture therapy and patient receiving acupuncture therapy. The forth, acupuncture effects which may be expressed by the electro-charge capacity is transfered between practitioner and patient via acupuncture. Electro-charge induced via acupuncture in practitioner may be an important factor that initiate the electro-charge changes in meridian and acupoint of patient.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.35 no.1
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• pp.7-12
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• 2003

The test results for water repellency of paper and paperboard according to KS M 7057 can readily be influenced by an operator's bias. In order to discard such bias, the automatic analysis program of water repellency was developed based on different shape features of a liquid trace formed on a specimen. That is, the shape of a liquid track flowing down on the specimen with an angle of $45^{\circ}$ was evaluated according to width variation between head and tail of the trace($S_{Hr}$), uniformity of a liquid flow($S_{d}$), length of long traces($L_{SHr}$), eccentricity of liquid traces($E_{i}$), and then was recognized as a specific degree of water repellency. Finally, the automatic analysis system of water repellency based upon KS M 7057 made it possible to readily measure water resistance of paper and paperboards classified into R0 to R10.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.58 no.2
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• pp.221-226
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• 2009

In this paper, we analyzed form of flowing leakage current in electrical installation. Leakage current ($I_g$) is consisted of resistive leakage current($I_{gr}$), capacitive leakage current($I_{gc}$), and inductive leakage current($I_{gl}$). Resistive leakage current($I_{gr}$) is big occasion than capacitive leakage current($I_{gc}$) in system, Residual Current Protective Device(RCD) detects correctly leakage current. But,$I_{gc}$ is big occasion than $I_{gr}$, RCD is malfunctioned It is resistance to lead to electric fire in electrical device. We manufactured outlet that resistive leakage current detecting circuit is had. Manufactured outlet displayed performance exactly in leakage current of 5 mA Therefore, this product estimates that contribute on electric fire courtesy call.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.10 no.3
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• pp.53-59
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• 2011

In this study, a two-phase closed loop cooling system is desinged and tested for a laptop computer using a FC-72. The cooling system is characterized by a parametric study which determines the effects of existence of a boiling enhancement microstructure, initial system pressure, volume fill ratio of coolant and inclination angle of condenser on the thermal performance of the closed loop. Experimental data show the optium condition when the volume ratio of working fluid is 70%, the pump flowing is 6ml/min, and the inclination angle of condenser is $0^{\circ}$. This research shows the maximum values which can dissipate 33W of chip power with a chip temperature maintained at $95^{\circ}C$.

• Proceedings of the KIEE Conference
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• 1998.07d
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• pp.1531-1533
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• 1998

In this paper, the characteristics of the shielded inductive superconducting fault current limiter was designed and simulated. Parameters of design for superconducting tube, core and primary coil were first determined. And then according to the system characteristics such as load resistance, fault angle and source voltage, the simple power system composed of shielded inductive FCL was simulated by computer-aided numerical analysis. The flowing currents under the fault condition can be limited to about 10 A.

• Proceedings of the KIEE Conference
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• 1999.07b
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• pp.806-808
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• 1999

An automatic measurement system of high value resistance standards($10M{\Omega}$ and $1G{\Omega}$) was developed. A system has been assembled with programmable do calibrators in two of the arms. An electrometer is used to measure the difference in currents flowing through the remaining two arms of the bridge consisting of unknown and standard resistors. Type A standard uncertainty was 2ppm in the $10M{\Omega}$, 1 ppm in the $1G{\Omega}$.

• Proceedings of the IEEK Conference
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• 2003.07b
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• pp.815-818
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• 2003

New sensing and writing schemes for a magneto-resistive random access memory (MRAM) with a twin cell structure are proposed. In order to enhance the cell reliability, a scheme of the low voltage precharge is employed to keep the magneto resistance (MR) ratio constant. Moreover, a common gate amplifier is utilized to provide sufficient voltage signal to the bit line sense amplifiers under the small MR ratio structures. To enhance the writing reliability, a current mode technique with tri-state current drivers is adopted. During write operations, the bit and /bit lines are connected. And 'HIGH' or 'LOW' data is determined in terms of the current direction flowing through the MTJ cell. With the viewpoint of the improved reliability of the cell behavior and sensing margin, HSPICE simulations proved the validity of the proposed schemes.

• International Journal of Air-Conditioning and Refrigeration
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• v.9 no.3
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• pp.57-62
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• 2001

Falling film heat transfer analyses with aqueous lithium bromide solution were performed to investigate the transfer characteristics of the copper tubes. Finned (knurled) tube and a smooth tube were selected as test specimens. Averaged generation fluxes of water and the heat flux were obtained. As the film flow rate of the solution increased, the generation fluxes of water decreased for both tubes due to the fact that the heat transfer resistance increased with the film thickness. The effect of the enlarged surface area at the knurled tube was supposed to be dominant at a small flow rate. The generation fluxes of water increased with the increasing degree of tube wall superheat. Nucleate boiling is supposed to occur at a wall superheat of 20K for a smooth tube, and at 10K for a knurled tube. The increased performance of the knurled tube was supposed to mainly come from the effect of the increased heating surface area.

• 한국초전도학회:학술대회논문집
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• v.10
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• pp.132-135
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• 2000

Magneto-resistances of the YBa$_2$Cu$_3$O$_{7-{\delta}}$ based coated conductors fabricated on the tilted single crystalline Ni substrates and RABiTS (rolling assisted bi-axially textured substrate) were measured under various magnetic fields. The activation energies of vortices were estimated from them by fitting equation of p = p$_o$ exp(-U(H,T)/k$_B$T). When currents flew in the rolling direction for the case of the tilted single crystalline YBCO on the RATS, the activation energies were similar to those of c-axis normal YBCO films on the SrTiO$_3$ single crystal substrates [5] and were slightly larger than those of the RABiTS coated conductors. On the contrary, for the currents flowing in the transverse direction, the magnetoresistances show double transitions in the temperature with much smaller activation energies.