• Journal of the Institute of Electronics and Information Engineers
• /
• v.49 no.11
• /
• pp.199-204
• /
• 2012

The study for developments and economics about the energies from the global warming is very active. For the effective saving and the spanning of the life extension about the 19% rates for the illumination system spending power about the whole electric energies, we proposed the new type of the current control method using a mixing system of the frequency modulation together with the pulse width modulation for the half-bridge power instrument. And we proved the excellence and the stability for our suggested system and analyzed the characteristics.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.17 no.5
• /
• pp.141-148
• /
• 2003

In the recently, the necessity of the hybrid type linear stepping motor(HLSM) of linear motion digital actuator has been increased in the various fields of the automatic control system. The HLSM is directly performed without any converting mechanism. Therefore, the HLSM is better advantaged in the efficiency and economical view than a rotary stepping motor. In this paper, we have designed an optimum tooth shape by the 2D finite element method(FEM) to develop the HLSM with longitudinal flux machine(LFM) type, and calculated the thrust force and normal force. And we have manufactured the prototype of it, and have experimented the thrust force characteristics of it.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.26 no.4
• /
• pp.6-13
• /
• 2012

In this paper, we took an indirect reflectance type that irradiates light from an LED module, which reflects light from a reflector onto the road. This LED pedestrian lighting design produces minimal glare from a relatively simple structure. Using LightTools 7.2, we conducted a study on the varying shape and curvature of the reflector. In order to further investigate this data, we researched the ratio of the DLOR and ULOR, the average illuminance, and the uniformity of the illumination. Based on this research, we selected optimum conditions to realize the actual LED pedestrian lighting using RELUX software. We found the average illuminance value to be 22[1x] and the illuminance uniformity ratio to be 0.23, which met the criteria of the proposed standards set in KS C 7658. In addition, it also satisfied the criteria of the standards set in KS A 3701 by having TI (Threshold Increment) at 7[%].

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.12 no.1
• /
• pp.3-11
• /
• 1998

The influence due to particle contaminated on spacer surface is remarkable in the decreasing of dielectric strength in SF6 GIS. In relation with this problem, We studied, AC flash-over voltage characteristics and breakdown mechanism are investigated under metallic and insulating particle initiated condition in SF6 gas by varying the particle position, particle shape with a plane-plane electrode. The main results are as follows $\circled1$ Influence of the flash-over voltage decrease for particle position is lowest in mid gap and is highest in separated small gap on electrode. $\circled2$ The metallic particle shape which results in the more reduced flash-over voltage, the FOV saturation moved in to the region of low pressure. $\circled3$Insulating particle less than 0.6[mm] are not almost influenced by the flash-over Voltage.oltage.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.13 no.1
• /
• pp.77-85
• /
• 1999

This paper deals with an experirrental study of a nondestructive testing system using a solenoid eddy currnet sensor to inspect deteriorations in overhead distribution lines, such as broken wires, severe local corrosion or zinc loss. Corrosion rrechanisrn for ACSR and ACSR-OC is discussed and characteristics for a solenoid sensor to insprt the georretrical pararreters of the coil and testing materials impOOance are briefly analyzed. A measurement system having a constant current source, a signal processing unit and a motor driver is impIemented. This instrument has such capabilities as detecting the sensor output and estimating dinHlsions of the testing conductors, continuously. As a result, it was shown that the eddy current sensor with an encircling coil could effectively estimate the diatreter change due to deteriorations in overhead distribution lines. lines.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.18 no.6
• /
• pp.100-107
• /
• 2004

Amusement electric train which is a kind of fun rides in amusement parks is prescribed by the provision of article 252 of the technical standards of the MOCIE(Ministry of Commerce, Industry and Energy) notification. The technical standards which is prescribed on the basis of Japanese technical standards is minimum compulsory standards in Korea. But these early standards can not be correctly applied for current condition of well-developed technical environment In order to improve the early standards, this paper will suggest a reform plan of the current technical standards by means of analyzing actual applied conditions and examining 28 amusement electric trains in Korea

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.11 no.1
• /
• pp.61-66
• /
• 2010

The purpose of this experiment is to analyze the basic status of brain. Which are consist of rest, attention and concentration, of the brain by measuring the temperature of color by changing RGB color after manufacturing LED-illumination stand. Basic status (rest, attention and concentration) of experimenter were measured temperature of colors having three difference temperature like as $2,300^{\circ}K$, $4,000^{\circ}K$ and $6,000^{\circ}K$. The results was shown that experimenter feels more comfortable and relaxation by decreasing the temperature of color. For example we can see the little increase of concentration index at $4,000^{\circ}K$ condition and we can estimate that right brain can be more activated at the $4,000^{\circ}K$ condition. But we can not find out any different at the $6,000^{\circ}K$ condition. Main cause of no difference from the color temperature was the similarity of color temperature under the general fluorescent lamp. And interface temperature of radiant heat design results LED and PCB was approximately 80 degrees to COMSOL Multiphysics, and changed until approximately 50 degrees until a floor plane of PCB, and verification as arranged chip LED to metal PCB, and it was possible, and a near radiant heat design was confirmed to an approximate value of, as a result, acid manufacture.

• The Journal of the Korea Contents Association
• /
• v.18 no.5
• /
• pp.472-481
• /
• 2018

The main point of this paper is to examine the composition of interior space of the residence centered on carved ceramic candlestick with the motive of Yeonga. And with the Yeonga candlestick developed using that, the application of space convergence in the interior design is researched. As the industry develops, pleasant and comfortable living environment draws attention in choosing residence with the psychology to engage nature into the house working. It is anticipated that the Yeonga candlestick interior accessories will be used to smoothly connect floor, wall and ceiling. As the shape of Yeonga includes the aura of the luminaire, the design element of Yeonga is researched through it. These sources are applied to the carved candlestick to investigate their application as indoor lighting. It is also a major viewpoint to develop this as a ceramic product and actively utilize it as a necessary interior item in daily life.

• Korean Journal of Optics and Photonics
• /
• v.28 no.6
• /
• pp.314-326
• /
• 2017

The display, which is closely related to modern life, is being developed as a window on a network connecting individuals, devices, and even other individuals from simple display devices, as the IT industry develops. To achieve a thinner, brighter unit with less consumption for backlighting, the LED light source has applied, and the study of complex light-guiding plates to improve luminance, uniformity, and viewing angle has been initiated. In this paper, we summarize the research results for the scatterers' pattern formation of the light-guiding plate and the arrangement and composition of the light source, which have enabled remarkable development of the LED backlight unit over the last 10 years. In addition, a large-area flat-screen illumination system, applying the light-guiding-plate technology to a currently noteworthy LED light-fixture design, is outlined. Finally, we discuss the direction and way to develop the current technology more progressively.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.11 no.1
• /
• pp.106-113
• /
• 1997

In this paper, we introduce the design method using CAE(Computer Aided Engineering) which is profitable in the compatibility and standardization of the developed product and in the reduction of construction time and price to develop and design a machine equipment. Particularly, we select the standard model to design ot develop from the large machinery to the super precision one, extract the peculiar characters of the model by the close analysis of the physical and technical part, can predict the previous result of experimental characteristics on objective dimensions through the analogical mathematical analysis, and can induce the design model demanded by user investigating optimal data in advance. We present the analogical algorithms and process method of design factors and restriction factors in the systematization design with computer. Then we analyze step functions for each systematization equipment and induce the process of technical data with actuator model.