• Title/Summary/Keyword: LED sensor

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Remote Water Quality Warning System Using Water Fleas

  • Park Se-Hyun;Kim Eung-Soo;Park Se-Hoon
    • Journal of information and communication convergence engineering
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    • v.4 no.2
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    • pp.92-96
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    • 2006
  • Hardware for monitoring the water quality using water fleas is developed. Water flea is a frequently used biological sensor for monitoring the water quality. Water fleas quickly respond to the incoming toxic water by changing their activity when they are exposed. By measuring the activity of water fleas, the incoming toxic water is instantly detected. So far the measurement of activity of water fleas has been done with a system equipped with both a light source of LED and a light detector of photo transistor. Water flea itself is, however, sensitive to light resulting in incorrect response and the system has two inconvenient separate parts of the light source and the detector. This paper suggests a system using a CCD camera instead of a light source and a detector. The suggested system processes the image data from the CCD camera in real time without any delay. The developed system becomes a part of the remote water monitoring embedded system.

The Implementation of The Multi-Subject, Multi-Channel Optical Telemetry System for Physiological Signals

  • Park, Cha-Hun;Park, Jong-Dae;Seo, Hee-Don
    • Journal of Sensor Science and Technology
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    • v.9 no.6
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    • pp.448-454
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    • 2000
  • This paper describes the implementation of a multi-subject, multi-channel optical telemetry system for the short range measurement of electrocardiograms (EKGs) a system which receives command signals and transmits physiological signals to the external system using LED (Light Emitting Diode) and PD (Photodiode). This system decreases the dependency of power supply voltage to the CMOS IC chips and a new enforced synchronization technique using infrared bi-directional communication has also been proposed. The telemetry IC with the size of $5.1{\times}5.1mm^2$ has the following functions: receiving of command signal, initialization of internal state of all functional blocks, decoding of subject selection signal, time division multiplexing of 4-channel modulated physiological signals, transmission of modulated signals to external system, and auto power down control.

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A Wireless Identification System Using a Solar Cell and RF Transceivers (솔라셀과 RF송수신기를 이용한 무선인식장치)

  • Lee, Seong-Ho
    • Journal of Sensor Science and Technology
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    • v.25 no.5
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    • pp.337-343
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    • 2016
  • In this paper, we newly introduce a wireless identification system using a solar cell and RF transceivers. The reader sends interrogating signal to a transponder using LED visible light, and the transponder responds to the reader using RF signal. The transponder consists of a solar cell, an amplifier, a microprocessor, and an RF transmitter. The solar cell receives the visible light from the reader and generates current to supply electric power to the other devices in the transponder. At the same time, the solar cell detects interrogating signal in the reader light. The microprocessor senses the interrogating signal and generates a responding signal. The RF transmitter radiates the responding signal to the reader. The transponder is a passive circuit because it operates without external power. In experiments, the maximum read distance between a reader and a transponder was about 1.6 meter.

AMPK Activators from Natural Products: A Patent Review

  • Uddin, Mohammad Nasir;Sharma, Govinda;Choi, Hong Seok;Lim, Seong-Il;Oh, Won Keun
    • Natural Product Sciences
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    • v.19 no.1
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    • pp.1-7
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    • 2013
  • AMP-activated protein kinase (AMPK) is a major cellular energy sensor and master regulator of metabolic homeostasis. On activation, this cellular fuel sensing enzyme induces a series of metabolic changes to balance energy consumption via multiple downstream signaling pathways controlling nutrient uptake and energy metabolism. This pivotal role of AMPK has led to the development of numerous AMPK activators which might be used as novel drug candidates in the treatment of AMPK related disorders, diabetes, obesity, and other metabolic diseases. Consequently, a number of patents have been published on AMPK activators from natural products and other sources. This review covers the patented AMPK activators from natural products and their therapeutic potential in treatment or prevention of metabolic diseases including diabetes and obesity.

Implementation of Non-Contact Gesture Recognition System Using Proximity-based Sensors

  • Lee, Kwangjae
    • Journal of the Semiconductor & Display Technology
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    • v.19 no.3
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    • pp.106-111
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    • 2020
  • In this paper, we propose the non-contact gesture recognition system and algorithm using proximity-based sensors. The system uses four IR receiving photodiode embedded on a single chip and an IR LED for small area. The goal of this paper is to use the proposed algorithm to solve the problem associated with bringing the four IR receivers close to each other and to implement a gesture sensor capable of recognizing eight directional gestures from a distance of 10cm and above. The proposed system was implemented on a FPGA board using Verilog HDL with Android host board. As a result of the implementation, a 2-D swipe gesture of fingers and palms of 3cm and 15cm width was recognized, and a recognition rate of more than 97% was achieved under various conditions. The proposed system is a low-power and non-contact HMI system that recognizes a simple but accurate motion. It can be used as an auxiliary interface to use simple functions such as calls, music, and games for portable devices using batteries.

Development of Power Consumption Notification System using Current Sensor (전류센서를 이용한 소비전력량 알림시스템 개발)

  • Jeong, Byeong-Su;Moon, Mi-Kyong;Kim, Jong-Woo
    • Proceedings of the Korea Information Processing Society Conference
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    • 2017.11a
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    • pp.1186-1188
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    • 2017
  • 2017년도 전기요금 누진세가 기존 6단계에서 3단계 구간으로 개편됨에 따라 평균적으로 요금이 낮아질 수는 있으나, 여름철 전력을 과도하게 사용할 경우 그 증가폭은 커질 수 있다. 본 논문에서는 소비전력량을 집 내부에서 간편하게 실시간으로 확인할 수 있도록 CT센서를 이용하여 소비전력량 알림시스템을 개발한다. 이를 통해 사용자는 전기사용을 조절할 수 있고, 불필요한 전기료를 절감할 수 있다. 본 시스템은 먼저 전류센서로 전류를 측정하여 emon.lib로 전압을 샘플링한 뒤 실효전류를 계산한 후 전력량, 누적시간을 구한다. 그리고 이 값들을 이용하여 소비자가 현재 누진세 적용단계를 쉽게 확인할 수 있도록LED/LCD/서보모터로 표현한다.

Study of Room Indicator Using Display (디스플레이를 이용한 재실표시장치 연구)

  • Song, Jae-Heon;Choi, Nack-Beom;Lee, Seung-Ho;Lee, Julia;Park, Yong-Wook
    • The Journal of the Korea institute of electronic communication sciences
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    • v.12 no.6
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    • pp.1087-1092
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    • 2017
  • This paper describes a work that makes convenient use of room indicator of a professors' office. The functions are divided into two main functions, the main function being the display panel and the additional function LCD display. Both of these functions are designed to be controlled by smart phone application using bluetooth wireless communication.

A Preliminary Study on Visual Display Terminal Syndrome Prevention System Using Ultrasonic Sensor (초음파 센서를 이용한 거북목 증후군 예방 시스템에 관한 기초연구)

  • Lee, Yoo-Jung;Im, Do Hwi;Yoo, Soo-Han;Na, Ye-Ji;Wang, Changwon;Min, Se Dong
    • Proceedings of the Korea Information Processing Society Conference
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    • 2016.04a
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    • pp.890-892
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    • 2016
  • 본 연구는 초음파 센서를 사용하여 사용자와 모니터 사이의 거리측정을 통해 거북목 증후군 예방 시스템 개발에 대한 기초연구로 수행하였다. 자세는 바른 자세, 중간 자세, 거북목 유발 자세 총 3가지로, 각 피험자의 역치값을 통해 자세를 구분하였다. 피험자는 총 4명으로 실험을 통해 설정해 놓은 역치값 이상의 신호가 들어왔을 때, LED를 켜서 사용자의 현재 자신의 자세에 대해 피드백을 주도록 구성하였다. 본 연구의 결과를 바탕으로 향후 거북목 증후군 예방과 관련된 다양한 연구에 도움이 될 것으로 사료된다.

Application to Gas Sensors by Electron Emission from Carbon Nanotube Emitters (탄소나노튜브 전극으로부터 전계방출을 이용한 가스센서의 응용)

  • Kim Seong-Jeen
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.19 no.5
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    • pp.405-410
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    • 2006
  • We fabricated gas sensors using carbon nanotubes (CNTs) as electron emitters for the purpose of detecting inert gases. By using the silicon-glass anodic bonding and glass patterning technologies with the typical Si process, we improved the compactness of the sensors and the reliability in process. The proposed sensor, based on, an electrical discharge theory known as Paschen's law in principle, works by figuring the variation of the discharge current depending on gas concentration. In the experiment, the initial breakdown characteristics were measured for air and Ar as a function of gas pressure. As the result, even though it should be realized that there are many other factors which have an effect on the breakdown of a gap, the sensors led to similar result as predicted by Paschen's law, and they showed a possibility as gas sensors which enable to detect the gas density ranged to the vacuum pressure from 1 to $10^{-3}$ Torr.

The Implementation of Non-contact Door-lock System for Preventing Fingerprint (비접촉식 지문방지 도어락 시스템 구현)

  • Kim, Hyun Ok;Moon, Kwang Soo;Kim, Seung Gyu;Kim, Doo Yong;Kim, Kiwan
    • Journal of the Semiconductor & Display Technology
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    • v.13 no.4
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    • pp.77-81
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    • 2014
  • There have been developed in authentication systems for information using biometric information approaches such as fingerprint, face, and iris. In general, a door-lock system is operated by touching keypads, which remains fingerprints on the keypads. Such door-lock systems do not protect personal information from others due to the exposure of fingerprints to keypads. In this paper, we propose the new door-lock system that does not leave fingerprints on the keypads. Without touching keypad the system works because the system accepts authentication information by using illuminance sensor and LED. The experiment shows that the implemented door-lock system works well under any circumstance.