• The Optical Journal
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• s.135
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• pp.38-42
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• 2011

이 원고는 Toshiba Lighting&Technology(주) LED사업부 LED기술총괄부 LED광원기술부 광원기술 제2담당인 오가와 코우조우씨가 월간 Optronics(통권 349호)에 기고한 내용이다. 본고에서는 현재 급속히 보급이 확대되고 있는 백열전구치환의 LED전구 LED유닛과 업계 최초로 HID램프사용 Downlight 치환의 LED Downlight에 대해서 LED조명보급을 위한 제품 콘셉 및 LED조명기구에 대한 광학설계를 소개했다.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2009.10a
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• pp.99-102
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• 2009

Fixture 일체형 LED 다운라이트(Downlight)의 광 효율 향상을 위하여 LED 장착위치 및 Reflector 길이, 히트싱크(Heat sink) 형태에 따른 광도(luminous intensity)와 기구효율(luminaire efficiency)을 시뮬레이션을 통하여 비교분석 하였다. 또한 히트싱크의 방열 설계를 시뮬레이션 하고 상용 LED 패키지 (Cree, XP-E P4)를 사용하여 시제품을 제작 하여 그 성능을 평가하였다. 그 결과 광속 9661m, 상관 색온도(CCT) 3,060K, 연색지수(CRI) 82의 광 특성을 갖는 LED 다운라이트를 개발하였다.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.25 no.9
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• pp.738-742
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• 2012

This paper conducted a study on how the heat radiation of light emitting diode(LED) luminaires affects the indoor temperature increase. The effect was compared with that of a 20 W compact fluorescent lamp(CFL) and a 50 W MR16 halogen lamp which are most widely used inside of cruises, a LED downlight and a 4W MR16 LED replacing each of them. We installed a luminarie inside a thermally shielded chamber, measuring the temperature changes under the same volume every 5 minutes and compared the result with theoretically calculated heat radiation. The temperature changes in the chamber was measured four times, on seven hours' period in order to keep sufficient time once the temperature reaches the thermal equilibrium state. The results showed that the temperature of the 20 W E26 CFL and the 10 W LED downlight increased by $21.1^{\circ}C$ and $10.4^{\circ}C$ respectively, while that of the 50 W halogen MR16 and the 4 W LED MR16 increased by $33.9^{\circ}C$ and $4.8^{\circ}C$ respectively. The experimental heat radiation were calculated from the results and the experimental heat radiation of the CFL and the LED downlight were 171.5 cal and 86.5 cal, and those of the halogen MR16 and the LED MR16 were 275.3 cal and 36.5 cal. Therefore, the heat radiation was reduced by 49.5% and 86.7%, respectively, by replacing conventional light source with LED. In conclusion, we can expect a reduction of power consumption in air condition system and the effect on indoor temperature increase by application of LED luminaires.

• Korean Institute of Interior Design Journal
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• no.22
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• pp.16-22
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• 2000

The purpose of this study is to analyze characteristics of set-booth in beauty salon as well as to suggest the basic design data for franchise beauty salon. The method of this research was based on field observation of the franchise beauty salon in Seoul. The results of this research are as follows. 1) In set-booth type analysis, set-mirror wall type and set-mirror partition type are mainly used, but set-mirror table type is not showed in this research. 2) In terms of scale, wall type and partition type are classified as large scale, wall type and partition type are used as meduim scale. In shop front analysis, the result is shown in two things. If it is type, they used partition type and if it is close type, they used wall type. 3) Set-mirror is consisted of mirror and drawer and it is classified by 4 types with combination method. In a result, most of them used separated mirror type because they want to emphasize the separation between set booth and its layout. 4) Lighting method has 4 types; corniced type, bracket type, pendant type and downlight type. Among them, downlight is showed as the most-used.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1497-1498
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• 2008

LED 조명기구의 최적 배광제어를 위한 방법으로 Reflector 와 Lens를 설계하여 빛을 제어한다. 그러나 Lens설계는 제작의 어려움과 광효율의 감소로 인하여 2차적으로 사용되는 방법이다. 이를 해결하기 위하여 본 논문에서는 Reflector를 이용한 배광 설계를 최적화하여 경제적인 제작이 가능 하도록 Photopia2.0을 이용하여 설계하였다. LED 각각의 개별 반사판과 모듈 전체 적용된 반사판을 적용하여 각 형태별 특징을 도출하였다.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.1530-1535
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• 2011

Heat radiation of LED luminaires has risen a problem when applied indoor. LEDs can save energy with higher efficacy than other light sources. However, their heat radiation may increase power consumption for air-conditioning. Therefore, this paper carried out a comparative analysis on the amount of heat radiation for MR16, E26 bulb, and down-light which will be replaced to LED luminaires. Heat amount of LED-MR16 and LED-downlight was 48% and 87.5% lower than that of conventional lamps, halogen MR16 and E26 CFL, respectively. Consequently, the heat amount and indoor temperature were proportional to the power consumption of luminaire. Therefore, the use of LED luminaire can reduce the amount of heat radiation as well as power consumption.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.60 no.6
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• pp.1178-1182
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• 2011

The best methods for distribution controled of LED lighting fixtures is control to designed LED chip array, lens and reflector. However, lens design need distribution design to reflector for low-wattage LED lighting because of difficulty of production and reduction of light efficiency. In addition, it needs maximize of thermal performance to improve the efficiency and reliability of device. As a result, for the height of reflector 40[mm] and Inclination 25[$^{\circ}$], we can see the best distribution properties, and, in the thermal properties, junction temperature MCPCB 62.9 [$^{\circ}C$], FR4 PCB 89.6 [$^{\circ}C$], FR4 PCB from Via-hole is 63.1 [$^{\circ}C$]. it may improve for thermal properties for makes the Via-hole.

• Korean Institute of Interior Design Journal
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• v.26 no.5
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• pp.34-41
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• 2017

It is necessary to conduct a basic research on fusion of ighting design or lighting environment to improve the health and quality of life of elderly people. The purpose of this study is to analyze the lighting situation of elderly people 's residential facilities in terms of space environment design plan and to analyze the trends in smart home, design and technology. It is to provide basic data for the prototype of lighting fixtures for elderly people living facilities considering functional, physiological and emotional characteristics. For the study, the target sites were selected and the results of the illumination survey of the target facilities were divided into two types of spaces, residential and other public spaces, and their location, lighting fixtures' type, color temperature, illuminance. The results of the survey showed that the overall physical illumination compared to the recommended illuminance for the elderly satisfied the recommended range and provided the appropriate brightness for the elderly. However, in the application layout of the lighting fixtures, a monotonous arrangement and a lighting fixtures type consisting entirely of simple square type fixtures and downlight types were applied. It would be desirable to use different types of lighting fixtures in the design for various functions, such as making the environment more comfortable. Future research will propose a prototype for the design direction of the subdivided lighting fixtures that classify the space according to functions and understand the vision problem of the elderly while aesthetically.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.64 no.2
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• pp.284-288
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• 2015

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.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.29 no.2
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• pp.1-7
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• 2015

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.