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자기 공진 결합 방식을 이용한 무선 전력 전송기술 구현을 위한 자기 공진기 소형화 설계
조영식,박지혜,남윤서,최세영,Cho, Young Seek,Park, Ji Hye,Nam, Yun Seo,Choi, Seyeong 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.8
A novel inductive resonator for the implementation of wireless power transfer using resonant inductive coupling is presented. The proposed inductive resonator is much smaller than the helix shape resonator suggested by MIT research team but operates the same resonant frequency with comparable wireless power transfer efficiency. The proposed inductive resonator is a spiral shape ($1,696cm^3$), which is 97 % smaller than the helix shape ($59,376cm^3$). The wireless power transfer efficiency is less than 9 % when compared to the helix shape resonator. With the reduce size and comparable efficiency, this novel inductive resonator can be used in practical application of wireless power transfer. 자기 공진 결합 (resonant inductive coupling) 현상을 이용한 무선 전력 전송 기술을 구현하기 위하여 새로운 구조의 자기 공진기를 제시한다. MIT 연구팀이 제안한 헬릭스 (helix) 모양의 자기 공진기의 크기를 줄이고, 공진 주파수 10 MHz를 유지하며, 무선 전력 전송 효율이 크게 열화 되지 않도록 설계한다. 새로운 구조의 자기 공진기는 스파이럴 (spiral) 모양으로써 헬릭스 모양 대비 소형화를 달성하였다. 스파이럴 모양 ($1,696cm^3$)의 자기 공진기는 헬릭스 모양 ($59,376cm^3$) 대비 97% 소형화를 이룩하였고, 무선 전력 전송 효율은 기존 기술 (2 m 거리에서 40 % 전송 효율) 대비 9% 이하로 차이를 줄임으로써 무선 전력 전송 기술의 실용화에 기여할 수 있게 되었다.
6.6 kV 케이블의 절연저항 측정을 위한 부하전류 및 온도 측정
박용규,조영식,이관우,엄기홍,박대희,Park, Yong-Kyu,Cho, Young-Seek,Lee, Kwan-Woo,Um, Kee-Hong,Park, Dae-Hee 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.1
The cable degradation process is largely divided into three steps; Step 1 : Thermal degradation, Step 2 : Weibull degradation, Step 3 : Partial discharge. it is progress in step order. This article aims to explain the process of cable degradation using the method of insulation resistance and accordingly to compose and manufacture a system of measuring the life of electrical cable. Before measuring the insulation resistance, a system of measuring the temperature and current of cables was made, and the established system was installed for test on the site of a power plant to collect the measured data. The current sensor was used TFC30P80A-CL420, and temperature sensor was used the DK-1270 PT100 sensor as RTD sensor. When measured the temperature and the load current at the same position, was confirmed that in case of the load current value was high, also temperature value high. Therefore, the correlation between load currents and temperature was verified, and the analysis of diagnostic data was evaluated, which could be utilized in identifying the fault condition of cable systems.
30 W COB LED광원의 효율 개선을 위한 방열설계에 관한 연구
서범식,이기정,조영식,박대희,Seo, BumSik,Lee, KiJoung,Cho, Young Seek,Park, Dae-Hee 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.2
In this paper, thermal analysis of heatsink for 30 W class Chip-on-Board (COB) LED light source is performed by using SolidWorks Flow Simulation package. In order to increase the convection heat transfer, number of fin and shape of the heatsink is optimized. Furthermore, a copper spread is applied between the COB LED light source and the heatsink to mitigate the heat concentration on the heatsink. With the copper spread, the junction temperature between the COB LED light source and the heatsink is $50.9^{\circ}C$, which is $5.4^{\circ}C$ lower than the heatsink without the copper spread. Due to the improvement of the junction temperature, the light output is improved by 5.8% when the LED light source is stabilized. The temperature difference between the simulation and measured result of the heatsink with the copper spread is within $2^{\circ}C$, which verifies the validity of the thermal design method using a simulation package.
Bluetooth와 Smartphone을 이용한 LED 디밍 시스템 구현
양우석,김혜명,조영식,박대희,Yang, Woo-Seok,Kim, Hye-Myeong,Cho, Young-Seek,Park, Dae-Hee 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.1
In this paper, LED lighting system is realized by using Bluetooth wireless communications and smartphones. A bluetooth module with a lighting control function is manufactured by miniaturizing a development board of TI company and the volume of LED dimming system as a whole is reduced. And a trial product is materialized by designing a hardware composed of the manufactured bluetooth module, LED down light equipped with degree warm white and cool white, and 2-channel LED driver; and LED dimming software. The materialized trial product is controled in terms of the brightness and color temperature of LED light source using an application of a smartphone. The experiment showed that the users can easily control the intensity of illumination of LED light source by using the scroll bar of the applications of smartphones. In addition, the color temperatures of both warm white and cool white can be controlled, and when the color temperature of the trial product using the manufactured bluetooth module is compared with that of a trial product of TI company, they show the same color temperatures.
전력케이블의 열화측정을 위한 부하전류 및 온도측정 시스템
박용규(Yong-Kyu Park),조영식(Young-Seek Cho),이관우(Kwan-Woo Lee),엄기홍(Kee-Hong Um),박대희(Dae-Hee Park) 한국조명·전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.2
Recently, there has been a surge in interest in equipment diagnosis and monitoring technology from the perspective of providing quality electricity in terms of reliability and safety. In order to meet the electrical demands of consumers, reliability of power supply needs to be maintained. For this purpose, a monitoring system for power cable is very important. Since real?time measuring equipment has many advantages, it is highly applicable. By measuring the load current and the surface temperature of power cables, we have monitored and identified the deterioration phenomena of power cables in operation. Since direct measurement of the cable conductor temperature is not easy, we have measured the surface temperature instead, and converted that temperature to obtain the conductor temperature of the cables. In addition, we have designed a system to detect the deterioration processes of the power cables in operation.
Bluetooth 무선 통신 기능을 이용한 LED 조명시스템 설계
김혜명(Hye Myeong Kim),양우석(Woo Seok Yang),조영식(Young Seek Cho),박대희(Dae Hee Park) 한국조명·전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.2
The Light Emitting Diode(LED) lighting control system proposed in this thesis is made up of a sensor module, a microcontroller, Bluetooth wireless communication, LED Driver, and LED downlight. The sensor module, comprised of an infrared sensor, an illumination sensor, and a temperature sensor, was designed to one Printed Circuit board(PCB). The system is able to identify the environment information collected by the sensor, and make it possible to control lighting automatically and manually through sensors. In addition, depending on users conditions, a color temperature can be controlled. CS-1000, a spectroradiometer, was employed to measure the changing values of a color temperature in 8 steps. According to a test, it was found that it was possible to change a color temperature from 3187K of Warm White LED to 5598K of Cool White LED. The Bluetooth based wireless communication technique makes it possible to control more lighting devices than other wireless communication techniques does.
양우석(Woo Seok Yang),김혜명(Hye myeong Kim),조영식(Young seek Cho),박대희(Dae Hee Park) 한국조명·전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.1
In this paper, an LED lighting system that is capable of automatic or maunal dimming control using a ultrasonic sensor and Bluetooth wireless communication technology is presented. The LED lighting system consists of a ultrasonic sensor, microcontroller unit, Bluetooth wireless communication, LED driver, and LED light source. By using the implemented LED lighting system sample, it is shown that the automatic and manual dimming control is realized. By using the ultrasonic sensor, the LED lighting is automatically brighter or dimmer depending on the distance between the sensor and an object. When using a smartphone that includes Bluetooth wireless communication function, one can not only manually control the brightness of the LED lighting from level 1 to 10, but also monitor the distance between the sensor and object on the smartphone.
김혜명(Hye-Myeong Kim),양우석(Woo-Seok Yang),조영식(Young-Seek Cho),박대희(Dae-Hee Park) 대한전기학회 2015 전기학회논문지 Vol.64 No.2
The color temperature flexibility-typed Lighting Emitting Diode(LED) lighting control system proposed in this thesis employs Pulse Width Modulation(PWM) technique to control the brightness of LED lighting. The LED lighting used as a light source has 20W downlight composed of two types of LED chips: one is Warm White and the other is Cool white. One multi-sensor module consisting an infrared sensor, an illumination sensor, and a temperature sensor was made, to which Bluetooth wireless communication technique was applied to enable a smartphone application to control lighting brightness and identify the information collected from the sensor. CS-1000, a spectroradiometer, was used to measure LED dimming control and the changing values of a color temperature in eight steps. According to a test, it was found that it was possible to change a color temperature from 3187K of Warm White LED to 5600K of Cool White LED.