• 한국생활과학회지
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• 제19권6호
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• pp.1053-1062
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• 2010

To assist the further development of hight-visibility clothing this study compared the visibility and subjective wear sensation of commercial protective vests with retro-reflecting materials or LEDs. Nine subjects compared high-visibility vests to evaluate how easy they were to see when exposed to the headlight of a car at night, and the subjects assessed the wear sensation of the vests also. The intensity and visibility of five different colored LEDs assembled on the five substrates separately were also evaluated to select the suitable LED color for night protective clothing. The intensity of illumination was measured by an illuminometer, and the visibility was evaluated by 11 participants both in a dark room and in front of a car outdoors at night. Results showed, the most effective LEDs were high intensity LEDs which shift blinking red and white were most effective. However, excessively high intensity of illumination could decrease the working efficiency. In subjective wear evaluation, the most favorable vest had a front opening, were adjustable at the sides, and had an electric power switch on the front of the vest.

• 한국전자통신학회논문지
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• 제7권2호
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• pp.433-438
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• 2012

현재의 증강현실 기술은 정해진 몇 가지에 해당하는 가상의 사물만을 보여주는데 그치고 있어 응용 범위가 넓지 않다. 가상의 사물뿐만 아니라 막대한 자료 중에서 원하는 자료를 증강현실로 구현하고자 하는 콘텐츠를 제작하고자 할 경우 마커가 표현 가능한 정보의 수를 그에 맞게 늘릴 수 있는 기술이 필요하다. 기 연구된 IR LED 마커는 LED의 On-Off에 따라 마커의 정보를 표현하였으나 많은 양의 정보를 나타내기 위해서는 LED의 개수를 증가시켜야하므로 마커의 크기가 커지게 되는 문제점이 있었다. 이러한 문제는 LED의 깜박임을 통해 데이터 신호를 발생시킴으로써 해결이 가능하다. 본 논문에서는 LED의 빛을 이용한 데이터 전송방식을 표현하는 OOK Code 알고리즘을 제안하고, 빛으로부터 데이터 신호를 얻게 될 경우 마커가 나타낼 수 있는 정보의 양 증가 및 마커 크기 축소에 대한 효율성을 보인다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 추계학술대회 논문집 전기물성,응용부문
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• pp.261-263
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• 2004

This paper studies the lighting pattern control of a high-brightness LED warning light. The driving circuit for the warning light is composed of a full-wave rectified circuit and of a control circuit using a micro-controller (AT89c2051). The micro-controller is programmed in a suitable manner to accomodate a number of variable lighting patterns and to adjust the blinking speed. To reduce the total number of LEDs installed a special consideration is made to the bundled pattern in a lamp module which is lit simultaneously. The resultant LED warning light has merits not only over the conventional incandescent warning light on the energy saving aspect but also over some other LED-type ones in the market.