• Title/Summary/Keyword: LED검사

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Design and Implementation of LED Lighting System with Adjustable Brightness and Color Capability (색상 및 밝기 조절이 가능한 LED 조명 기구의 설계 및 구현)

  • Kwak, Seong-Woo
    • The Journal of the Korea institute of electronic communication sciences
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    • v.10 no.5
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    • pp.579-586
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    • 2015
  • In this paper, we design and implement a lighting system which has a capability of adjusting brightness and colors of LED module. The lighting systems is consisted of RGB and white LEDs controlled by a micro-processor. All colors in nature can be synthesized in our lighting system by controlling brightness of 4 color LEDs individually. The current flowing to LED is limited to a maximum set value to extend the LED life time using PWM current control. The control module also includes the function that it can save and load brightness and color data set by the user. The implemented lighting system passed the electromagnetic compatibility(EMC) test such that it can be used as a commercial product.

LED Deformity Detection Using LabVIEW Builder (랩뷰 비전 빌더를 이용한 LED 결함 검출 시스템)

  • Xi, Wang;Yoo, Sung-Goo;Chong, Kil-To;Vista IV, Felipe P.
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.46 no.5
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    • pp.15-21
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    • 2009
  • Deformity detection in a Light Emitting Diode (LED) is an important aspect for improving its quality. These LED deformities can be checked through several methods. This paper details the automatic deformity detection inspection system of a LED using the LabVIEW Builder 3.6 software. This software has a graphical user interface which makes it easy to observe and modify the behavior of its element. The LabVIEWs essential elements are also presented and explained aside from its image acquisition system. Details on how to build an inspection system and how to implement vision inspection algorithm which mainly consists of edge detection, geometry point location, and distance measurement are included in this paper.

New Lighting Control System for Light Devices (새로운 조명기기 점등제어 시스템)

  • In, Chi-Goog;Yoon, Dal-Hwan;Lin, Chi-Ho
    • Journal of IKEEE
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    • v.15 no.4
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    • pp.261-266
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    • 2011
  • In this paper, new efficient lighting control system for light devices is proposed to reduce power consumption and increases LED life-cycle and heat efficiency of LED lighting module. The new proposed lighting control system for light devices divides into 4 stages according to the illuminance surrounding by measuring illuminance and apply to automatic pattern lighting algorithm. And via level check will be light up for set time by applying intersection lighting algorithm of magic square pattern forming a fully symmetrical. Experimental analysis results, shows heating value and power consumption reduced to maximum 30 percent and lifetime of LED improved to maximum 60 percent in comparison with previous lighting system so applying system to LED streetlight, stable and high energy efficiency can be acquired.

스마트폰 카메라 및 보안 스티커 검출 방법

  • Kim, Chang-dae;Choi, Seo-hyuk;Ryu, Sung-pil;Kim, Dong-woo;Ahn, Jae-hyeong
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2016.05a
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    • pp.823-826
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    • 2016
  • This paper proposes a method for detecting automatically a smartphone camera in order to put a security stickers and detecting security sickers to recognize whether the removable security sticker or not. The method reduce the time that a person put a security stickers and check the stickers whether the removable stickers at rush hour. It is significantly low to detect rate if the image quality is poor low by LED light flickering phenomenon at the time of the camera detection of the smartphone. Therefor, in this paper, it implement the method that detecting camera to inspect frequently degree after applying the adaptive threshold. Further, in order to recognize whether the removable security sticker or not implement the sticker region detection method using a color filter. The proposed method could increase detecting ratio than earlier methods with LED light flickering phenomenon. In addition, it was also high security sticker detection ratio.

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Analysis of LED signal lights Characteristic for Marine (해상용 LED 등명기 특성 분석)

  • Jeong, Jae-Hoon;Ahn, Jong-Ryeol;Kim, Jong-Kook;Kim, Hyun-Jo;Kim, Jong-Hun;Yu, Chung-Hyun
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2009.06a
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    • pp.439-442
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    • 2009
  • 해상용 200mm 등명기를 대체하기 위해 2003년 최초로 국내에서 LED 등명기가 개발되었다. LED 등명기는 개발되어진 이래로 그 수요가 계속 증가하고 있으며, 기능 또한 많이 개선되어지고 있다. 그러나 현재까지 LED 등명기에 관한 심도 있는 분석이 이루어지고 있지 않다. 본 논문은 LED 등명기의 사용전검사시 색상별 부동광도 및 정기검사(3년) 시 부동광도 감소율 등을 통계조사를 통해 알아보고, 현재 진행중인 LED 등명기 수명실험의 2차년도까지의 결과를 토대로 현단계에서의 개선점을 찾아보기 위해 작성되었다. 또한 향후 계속적인 LED 등명기 성능 기선 연구에 기초자료를 제공하고자 한다.

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A Study on the Illumination Environment of Ultrasound Examination Room (초음파 검사실의 조도 환경에 관한 연구)

  • Im, In-Chul;Lee, Hyo-Yeong;An, Hyun
    • Journal of the Korean Society of Radiology
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    • v.11 no.4
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    • pp.213-219
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    • 2017
  • The purpose of study is provide the basic data for set up proper illuminance of examination room that put purpose of an empirical study basic data about examination environment setting of the ultrasonic examination on design the examination environment of a new ultrasonic examination. As a method, to investigate the ultrasonic environment related to illumination to take a survey on the ultrasonic examination about test object to 48 parts of six units of general hospital in Busan. As a result, All Door + Curtain showed high scores in analyzing the gender, age, examination part in the case of ultrasonic examination room shielding and LED and light source control is required in the case of kind of light source. In the ultrasonic examination environment survey, the illuminance brightness is average 10 Lux which is included illuminance brightness range recommended the WHO and CEC and illuminance brightness of ultrasonic examination waiting room(ultrasonic examination waiting room, corridor) indicate average 300~800 Lux and it satisfied hospital illumination environment more than 300 Lux recommended by KSA 3011. In conclusion, Basic data suggested that improved future ultrasonic examination environment or designed new examination room on the basis of analysis result of general background and ultrasonic examination related to environment factor.

Transmission Performance Improvement Using Brightness Deviation for Visual-MIMO System (Visual-MIMO 시스템에서 휘도편차를 이용한 전송 성능 향상)

  • Kim, Hee-jin;Kwon, Tae-ho;Park, Young-il;Kim, Ki-doo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.40 no.10
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    • pp.1871-1878
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    • 2015
  • Recently, research on the Visual-MIMO by applying the concept of MIMO to communication between the LED array and camera is in progress. Although we already introduced the method for bit decision by using reference LED array pattern, it has the disadvantage of measuring the ISI each time when there is a change in the distance. To overcome this, in this paper, we propose a bit decision and error correction method used by using the luminance deviation without using the reference array pattern. First, we execute the bit decision using experimentally determined threshold. Next, we execute the error checking on the ON-LED and make a correction only if it is found to be error. Correction is determined by using the value of brightness deviation corresponding to the range of 68.2% (1) around the maximum frequency of the histogram for each ON-LED. We verify the performance of the proposed method according to the variation of ISI with distance by using both numerical and experimental analysis.

The Effects of Photodynamic Therapy for Vancomycin-resistant Enterococci

  • Kwon, Pil Seung
    • Korean Journal of Clinical Laboratory Science
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    • v.43 no.3
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    • pp.124-132
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    • 2011
  • The aim of this study was to evaluate the effects of the photosensitizer photogem with light-emitting diode (LED) on vancomycin-resistant enterococci (VRE). Two VRE strains isolated from the feces of patients. that was identificated Enterococcus faecium (vanA) and Enterococcus gallinarum (vanC1) using traditional biochemical tests and confirmed VRE genotyping from using polymerase chain reaction. In addition, three strains were used Enterococcus. faecalis CDC-286 (vanA), E. faecalis CDC-583 (vanB) and E. gallinarum CDC-42 (vanC1). To examine the antimicrobial effect of photogem mediated photodynamic therapy (PDT) against, CFU quantification and Disk diffusion antimicrobial susceptibility test were evaluated. The effects of Photodynamic therapy was not associated with genotype. Photogem mediated PDT perfectly inhibited the colony formation of E. faecalis CDC-286. The number of viable bacteria decreased greatly after PDT application with photogem $50{\mu}g/mL$ and energy density of $15J/cm^2$. The diameter of inhibition zone was increased to after PDT more than before PDT. The case of vancomycin disc on E. faecalis CDC-583 and E. galinanum-Patient were changed from resistant to intermediate resistant, from intermediate resistant to susceptable. These results demonstrate that lethal photosensitization of VRE can be achieved using photogem plus 630 nm LED irradiation.

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Development of the Defect Inspection Equipment for Mobile TFT-LCD Modules (Mobile용 TFT-LCD 화면 검사장비 개발)

  • Koo, Young-Mo;Hwang, Man-Soo
    • Journal of the Korean Institute of Intelligent Systems
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    • v.19 no.2
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    • pp.259-264
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    • 2009
  • High level quality control is required for mobile TFT-LCD modules which are frequently used for fine observation. However, quantitative quality control is difficult. Defect inspection using naked eyes makes irregular inspection results. This paper developed desk type defect inspection equipment for mobile TFT-LCD modules using the same inspection criterion with that of naked eyes. From experiments using this equipments, possibilities of standardization in defect inspection equipment for mobile TFT-LCD modules are presented.

A Development of Multi-Sensors LED Streetlight Lighting Control System Based on RTOS (RTOS 기반의 다중센서 LED 가로등 점등제어 시스템 설계)

  • In, Chi-Goog;Lin, Chi-Ho
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.37C no.11
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    • pp.1020-1026
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    • 2012
  • In this paper, we proposed a RTOS-based lighting control system to improve energy efficiency. This proposed system, real time process was designed to the specified division of the LED streetlight control module for the RTOS-based lighting control into three different tasks. The first task transmits LED lighting signal by measuring illuminance, and the second task transmits motion detecting signal using motion detector. In the third task, lighting control to LED was designed through passed control signal from other tasks The execution status was examined ports that are directly to the ATmega128 MCU for the verification of the system, and illuminance distribution and operating conditions were verified through LED street field test. The proposed RTOS-based lighting control system has brought improving system performance and also facilitate an addition of other functions, and it was possible to optimize energy saving by intelligent lighting pattern control.