• Title/Summary/Keyword: LED 신호

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Smart watch with reflective Pulse Oximeter (반사형 Pulse Oximeter를 통한 스마트 손목시계)

  • Lee, Hooseok;Thap, Tharoeun;Moon, Chanki;Nam, Yunyoung;Lee, Jinseok
    • Annual Conference of KIPS
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    • 2015.04a
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    • pp.1046-1048
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    • 2015
  • 본 논문은 웨어러블 디바이스의 한 종류로써의 스마트와치에 적용할 수 있는 헬스케어 기술에 대한 제안이다. RED LED와 IR LED를 통해 얻어진 신호로부터 아날로그 필터 증폭을 통해 얻어진 PPG신호를 이용하여 생체신호인 심박수와 $SpO_2$를 측정하여 보았다. 이 신호를 블루투스 통신을 통해 PC에서 데이터를 받아 보았고, 추후에 스마트폰과 연동하여 실용적으로 사용 될 수 있다.

The Heart Rate Monitoring System using Inverted Photoplethysmography (반전 용적맥파 신호를 이용한 심박 모니터링 시스템)

  • Lee, Jun-Yeon
    • Journal of the Korea Society of Computer and Information
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    • v.17 no.3
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    • pp.105-111
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    • 2012
  • Photoplethysmogram is widely used to measure heart rate and arterial blood oxygen saturation in human. This paper describes implementation a photoplethysmography monitoring system that uses 780nm and 940nm length infrared light in radial artery. That system used combinations of 8 LEDs and 2 photoelectricities. When recorded on the skin over radial artery, the radial pulse wave was inverted. The mechanism of inverted pulse wave skin, which was reduced during systolic period and increase during diastolic period of the cardiac cycle. Through this system, we discovered optimal environments and combinations of sensors in both penetration type and reflection type. These results suggest that radial arterial wall way reflect infrared ray.

A Comparison Characteristics on the Structures of the LED Traffic Signal Lamp Controller for the Domestic Use (국내 LED 교통 신호등용 안정기 구조별 특성 비교)

  • Park, Chong-Yeun;No, Kyung-Ho
    • Journal of Industrial Technology
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    • v.25 no.B
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    • pp.183-188
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    • 2005
  • Instead of the incandescent lamps the LED lamps have been used on the traffic signal lamp with the advantages of small loss, no lens and long life. In this paper, we have compared three kinds of the LED controller structures and showed the LED array decision methods. We studied the temperature characteristics on LED and the temperature compensation network. The experimental results showed that the electrical characteristics of three kinds of the LED controller structures were different each other. We concluded that the temperature compensation is the important technique, the best compensation network has the ${\pm}10%$ variation for the luminous intensity.

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LED Communication based Multi-hop Audio Data Transmission Network System (LED 통신 기반 멀티 홉 오디오 데이터 전송네트워크시스템)

  • Jo, Seung Wan;Le, The Dung;An, Beongku
    • Journal of the Institute of Electronics and Information Engineers
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    • v.50 no.6
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    • pp.180-187
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    • 2013
  • In this paper, we propose a LED communication based multi-hop audio data transmission network system. The main contribution and features of the proposed system are as follows. First, the contribution of this research is to develope the LED communication based multi-hop transmission network system which can transmit audio data signal with long distance via multi-hops. Second, the developed system has the following features: In transmitter, audio data is transmitted after encoding with S/PDIF format via a general LED. The relay receives digital audio signal by using photo diode and then transmits the signal to receiver after error checking and amplifying. The receiver receives the encoded audio data via photo diode and then converts to analog audio signal by using decoding and amplifying. The performance evaluation of the proposed system is conducted in the laboratory with fluorescent light source. The results of the performance evaluation confirm that the system can provide high quality audio transmission from transmiter to receiver via multi-hop relays in a long distance while we can see there are differences in the transmitted audio quality according to the used LED colors.

A Study on the Development by LED Dimming Dimmer of Mutiple Channel used Suitable DMX512 by Camera Imaging (카메라 영상 촬영시 적합한 DMX512을 이용한 다중채널의 LED 디밍용 디머 개발에 관한 연구)

  • Lee, Jang-Weon
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2011.11a
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    • pp.360-363
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    • 2011
  • 카메라 촬영시 LED방송조명 등기구를 조도 디밍하는 경우에 카메라 셔터속도가 빨라 질 경우, 카메라가 신호를 감지하며 카메라 영상에 플리커 현상이 생기게 된다. 그 현상을 없어지게 하기 위하여 LED 디머의 PWM속도를 충분히 높여주어서 카메라 셔터속도가 빨라져도 어느 정도 범위에서 감지하지 못하도록 하였다.

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A Study on LED Light Dimming Control Technology using doppler and IR sensor (도플러 및 적외선 센서 융합기반 주차장환경 LED등 연속디밍 제어 기술에 대한 연구)

  • Hwang, Hyunsuk;Jung, Soonho;Rho, Jungkyu;Shin, Hojin
    • Journal of Satellite, Information and Communications
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    • v.9 no.3
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    • pp.74-79
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    • 2014
  • Illumination is an effective technique that must be in the mankind today. These lights, there is artificial light that is created by using an artificial light source daylight illumination by sunlight, in this paper, it is created using the electrical energy it is a paper on the study of technology management scheme and efficient control technology of artificial light.

Development of bicycle device to strengthen safety (안전 강화를 위한 자전거 장치 개발)

  • Oh, Byung-Wuk
    • Journal of Industrial Convergence
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    • v.17 no.4
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    • pp.125-129
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    • 2019
  • With the growing number of people using bicycle, the number of bicycle accidents also has been increasing. It is said that bicycle accident can be reduced up to 11%~44% when riding a bicycle if LED light is used. The headlight of the bicycle makes exposure effect to the opposite side of bike rider while taillight makes exposure effect to the rear bike rider for improving safety. Bicycle safety device capable of displaying a change of direction by LED is implemented in this study in response to control button signal. This signal makes LED light which is installed in pedal and wheel of bicycle as a module type emitting or flickering during the fixed hour. Bicycle auxiliary device in pedal which is able to improve safety using LED when bikers are riding a bike at night is developed in this study. Bicycle safety device applying wireless communication technology will be expected alternative technology in the future to solve a social problem such as energy, environment, and safety.

Implementation of a BLU system for advertisements using a LED and Acryl (LED와 아크릴을 이용한 광고용 BLU 시스템 구현)

  • Kim, Han-Na;Lee, Hyuek-Jae
    • Journal of the Institute of Convergence Signal Processing
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    • v.11 no.4
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    • pp.326-331
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    • 2010
  • This paper has proposed and experimentally demonstrated a new BLU using an LED and an acryl, which is specially focused on the implementation about the guiding effect of an acryl luminous by the LED. While the conventional BLU using a fluorescent lamp is generally and widely used, it shows big power consumption with a short life even more too thick to hold on the wall. To solve such demerits, we propose a new method for a BLU using an LED and an acryl in this paper. This BLU system has various scratches on the surface of acryl to get diffusion effect of light, and has been included an embedded board that can dynamically control the colors and the intensity of the BLU through the Internet. We have conducted computer simulations to find out the optimal scratch pattern on the surface of the acryl for the backlight system. Based on the resulted out simulation. The the optimal scratch pattern signs has been developed. The simulation result shows 2,673Lux an average for a luminous intensity test, and the other hand, experiential result shows 2,554Lux. From the experiments, it is possible for the proposed BLU system to be used for real advertisements.

Current Source LED Switching Driver for Visible Light Communication (전류원 방식의 가시광 무선통신용 LED 스위칭 드라이버)

  • Baek, Mi-Ran;Cho, Sang-Ho;Jang, Byung-Jun;Han, Sang-Kyoo;Hong, Sung-Soo;Roh, Chung-Wook
    • Proceedings of the KIPE Conference
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    • 2010.07a
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    • pp.424-425
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    • 2010
  • 가시광 무선통신 시스템은 LED 전류를 데이터 신호에 따라 제어하여, 기존의 LED 조명장치를 통신 수단으로 사용 가능하기 때문에 차세대 통신 수단으로 주목 받고 있다. 본 논문에서는 이러한 가시광 무선통신 시스템을 위한 전류원 구동 LED 드라이버를 제안한다. 제안된 LED 드라이버는 컨버터의 전류원을 이용하고 LED와 병렬 연결된 스위치 소자를 스위칭 구동방식으로 제어함으로써, 기존의 선형 구동방식보다 전력손실 및 발열을 크게 개선하여 대용량의 LED 조명장치에 적용할 수 있는 장점이 있다. 제안 회로의 가시광 무선통신 시스템 구현을 통해 제안된 LED 드라이버의 우수성 및 이론적 해석의 타당성을 검증한다.

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Visible Light Communication based Multi-hop Multimedia Data Transmission Networks System (VLC 기반 멀티 홉 멀티미디어 데이터 전송 네트워크 시스템)

  • Park, In-Chul;Shin, Jung-Jin;Park, Joo-Young;Dung, Le The;An, Beongku
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.14 no.3
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    • pp.21-31
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    • 2014
  • In this paper, we propose VLC(visible light communication) based multi-hop multimedia data transmission system. The main contributions and features of the proposed system are as follows. First, the contribution of this research is to develope the LED communication based multi-hop transmission network system which can transmit multimedia data(audio data, video data) with long distance. Second, the developed system has the following features: In transmitter, audio data and video data are transmitted via multi-hops using two channels. The relay in audio channel receives digital audio signal by using photo diode and then transmits the signal to receiver after error checking and amplifying. The receiver receives the encoded audio data via photo diode and then converts to analog audio signal by using decoding and amplifying. The relay in video channel receives video signal by using photo diode and then amplify the video signal using OP-AMP and then transmits the signal to receiver. The receiver amplifies the received signal from photo diode and then sends it to the monitor. The performance evaluation of the proposed system is conducted in the laboratory with fluorescent light source. The results of the performance evaluation confirm that the system can provide high quality multimedia data transmission from transmiter to receiver via multi-hop relays in a long distance while we can see there are differences in the transmitted multimedia(audio and video) quality according to the used LED colors.