• Journal of Industrial Technology
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• v.17
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• pp.175-182
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• 1997

Various types of electronic starter have been developed for the general fluorescent lamps with magnetic-type ballasts. However, the FL032/T8 fluorescent lamp requires higher voltage to discharge the lamp. The general starter with two-terminal is not suitable for the FL032/T8 slim-line type fluorescent for its higher discharge voltage. The suitable starter with three terminals have been studied for the FL032/T8 lamp in this paper. The developed starter have better characteristics in view points of the discharge voltage magnitude. We have proposed and designed the three terminals electronic starter. The proposed starter have been experimented and compaired with the other 2-terminal general starters. By the experimental results, we have concluded that the proposed starter is suitable to the FL032/T8 lamp.

• The Journal of the Korea institute of electronic communication sciences
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• v.8 no.8
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• pp.1143-1148
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• 2013

This paper deals a watt-hour meter monitor system with applying a Power Line Communication (PLC) modem and a Data Concentrator Unit (DCU). PLC modem uses the power line, so there is no need to install dedicated wiring. This system makes it possible to monitor the amount of electricity of previous current month metering data, so it can easily apply a PC-management for the electric charges and maintenance with gathering the metering data.

• Journal of Korean Society for Atmospheric Environment
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• v.14 no.4
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• pp.333-342
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• 1998

Plasma process has great possibilities to remove SOx, NOx simultaneously with high treatment efficiency and is expected to be suitable for small or middle plants. It was accomplished to evaluate SO2, NOx control possibility and achieve basic data to control pollutants by use of Surface Discharge Induced Plasma Chemical Process (SPCP) in this study. O3 generation characteristics by discharge of a plate was proportional to O2 concentration and power consumption and inversely proportional to temperature and humidity, In case of dry air, NOx was highly generated by N2 and O2 in air during the plasma discharge process but it was decreased considerably as H2O was added. SO2 removal efficiency was very high, and removal rate was 170,350 mEA at 30,50 watt respectively in flue gas which is usually contain HIO. NOx removal efficiency was about 57% at 40 watt power consumption with 7.5% humidity. It is estimated that H2O has an important role in reaction mechanism with pollutants according to plasma discharge.

• Transactions on Electrical and Electronic Materials
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• v.6 no.4
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• pp.173-176
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• 2005

A new $MoO_3$ based microsensor with low power consumption was presented. Typical size of sensor was 5mm in width and 8mm in length. As a sensitive electrode, $MoO_3$ was successfully fabricated by IC technology on pyrex glass of $250{\mu}m$ in thickness. After annealing at $550^{\circ}C$ for 3hrs, the film was fully crystallized and demonstrated as pure $MoO_3$ structure. The grain size of $MoO_3$ was plat like and typical size was about $1{\mu}m$. Based on the results of sensitivity measurement, $MoO_3$ microsensor shows especially high selectivity to $H_2$ reducing gas atmosphere. The applied heater power was lower than 0.5 Watt.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.6 no.1
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• pp.11-19
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• 1994

An optimal design for Gifford-McMahon/Joule-Thomson(GM-JT) refrigerators was performed by a numerical method. The design goal was to meet the cooling requirement for MRI systems, which was 3 Watt at 4 K. A general cycle analysis program was written to calculate the cooling capacity of the GM-JT refrigerators for the givenstage GM refrigerator. The program was executed for a specific refrigerator with various design parameters. The optimal values for the maximum cooling were found for the sizes of the heat exchangers, the mass flow rate of helium, and the compression pressure.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.55 no.11
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• pp.577-581
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• 2006

This paper deals with an automatic rotor design functional standard computation based on torque/volume for a synchronous reluctance motor(SynRM). The focus of this paper is the design relative to the torque/volume on the basis of each rated watt according to the rotor diameters of a SynRM. The coupled finite elements analysis (FEA) & sequential unconstrained minimization technique (SUMT) have been used to evaluate design solutions. The proposed procedure allows to define the rotor geometric design function according to the rotor diameter and rated watt starting from an existing motor or a preliminary design.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.26 no.12
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• pp.2527-2534
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• 2002

An efficient method is proposed for the design of six-bar function generators with complex design tasks. Especially, the desired functions are defined for the entire motion ranges of the input variables. The design problem is defined as a nonlinear optimization problem. A concept of a weighted structural error is introduced for the definition of the objective function. Also simple branch identifiers are incorporated to eliminate the branch problems commonly encountered in a typical linkage synthesis problem. Two example problems of designing a Watt-II type double dwell mechanism and a Stephenson-III type double beat-up mechanism are demonstrated with numerical results. Constraints such as on the Grashof conditions and on the transmission angles are included for practical solutions.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.2295-2296
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• 2008

본 논문에서는 에너지 절감을 위하여 POWER LED 구동회로를 PIR(Pyroelectric Infrared Ray) 센서를 이용하여 ON/OFF 제어를 하였다. POWER LED의 전류 특성을 설명하였으며 설명된 전류 특성을 개선하고자 정전류 유지 회로를 구성하였다. 그리고 인체 감지 센서에서 발생되는 ON/OFF 신호를 증폭시키는 구동 회로를 설계하여 정전류 유지 회로에 직접 결합하는 방식을 제안하였다. 실험한 결과는 POWER LED의 ON 상태시 4Watt, OFF 상태시 0.5Watt를 소비하였으며, 정전류 유지 회로에 의해 POWER LED 구동 전류의 리플이 줄어들어 안정적인 동작을 하는 것으로 나타났다.

• Proceedings of the KIEE Conference
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• 1990.07a
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• pp.236-238
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• 1990

For improving magnetic properties of the amorphous Fe-B-Si alloy, we annealed in a magnetic field oriented in the plane of the ribbon longitudinal to its long axis. By field annealing, coercive force and total core loss are reduced from 0.04 Oe to 0.02 Oe, and from 0.25 watt/kg to 0.15 watt/kg respectively comparing with non-field annealed specimen. These reductions were caused by the formation of $180^{\circ}$ domains parallel to the annealing field due to the induced anisotorpy.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.08a
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• pp.279-279
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• 2011

본 연구는 LED 등기구에서 방열코팅소재에 따른 방열 효과를 연구하여 LED 등기구를 안정적으로 유지 제어 할 수 있는 방법을 찾고자 한다. 그에 따라 동일한 기구물에서 방열코팅만 변화하여 LED chip 온도의 Steady State 온도를 비교 측정하였다. 방열코팅은 동일한 알루미늄 Heat Sink에 일반분체코팅, Anodizing 처리, 알루미나 방열도료, Graphene이 섞인 알루미나도료, Graphene 잉크 등의 방열코팅소재를 아무 처리를 하지 않은 알루미늄 Heat Sink 와 비교 하였다. 온도는 LED chip, LED base plate, 코팅이 된 표면, 코팅 내부 2 mm 부분의 온도를 각각 Steady State가 될 때까지 측정하였다. 또한 LED의 power를 7 watt에서 13 watt 변화하면서 방열 원리를 분석하였다. 본 연구를 통하여 각 코팅소재에 따른 방열효과와 그 방열 원리를 연구 분석하였다.