• Title/Summary/Keyword: Failure Detection of LED

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Thermal Analysis for Improvement of Heat Dissipation Performance of the Rail Anchoring Failure Detection Module (레일 체결구 결함 검측 모듈의 방열성능 개선을 위한 열 해석)

  • Chae, Won kyu;Park, Young;Kwan, Sam young;Lee, Jaehyeong
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.29 no.2
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    • pp.125-130
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    • 2016
  • In this paper, various heat dissipation designs for a rail anchoring failure detection module were investigated by a thermal flow analysis. For the detection module with the heat dissipation design on the overall housing surface, an average temperature inside the module was lowered by $25^{\circ}C$ when compared to no heat dissipation design. In addition, an internal heat-flow blocking layer and an heat conduction layer inserted between the LED module and housing case were effective in reducing the temperature in the rail anchoring failure detection, which has a limited space for installation and little air flow. Especially, the temperature near LED module decreased below $55^{\circ}C$ when the optimal heat dissipation design was applied.

Development Process on IoT Platform for Faults Detection of Outdoor LED Lighting Installation (옥외 LED 조명설비의 고장검출 IoT 플랫폼 개발을 위한 프로세스)

  • Park, Kun-Young;Kwak, Dong-Kurl;Jung, Min-Sang;Park, Dong-Hun
    • Proceedings of the KIPE Conference
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    • 2018.07a
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    • pp.273-274
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    • 2018
  • Recently, many countries around the world are investing heavily in green industries based on green IT technology. The key industry in the green industry is LED. If we replace traditional lighting, we can save a lot of socioeconomic costs. Because it is energy efficient. However, the research and development on maintenance and management are still insignificant about LED lighting. Therefore, after the failure, the post-treatment is delayed and often occurs. In order to solve these problems, it is planned to detect the failure of the LED lighting and to establish a monitoring system that can monitor the situation in real time on the computer or mobile phone of the remote manager using the latest IoT network technology.

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A Study of the Defect Detection Method of Vision Technology via Camera Image Analysis on 4-col 7-row LED Screen Module (4단 7열 LED 사이니지 전면부 설치형 카메라기반 불량 LED 소자 검출 Vision 기술에 관한 연구)

  • Park, Young ki;Im, Sang il;Jo, Ik hyeon;Cha, Jae sang
    • Journal of Korea Multimedia Society
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    • v.23 no.11
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    • pp.1383-1387
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    • 2020
  • Recently, a 4-col 7-row LED Screen that provides various information of major roads and local governments has been installed and operated. However, due to deterioration due to changes in temperature and humidity, deterioration due to static electricity, and mechanical stress, partial module failure of the display may occur, which is a major cause of missing information of vitally given to citizens. However, there have been frequent cases where the 4-col and 7-row LED Screen that have failed due to reasons such as installed location where the signboards are installed on the road and outdoor, the lack of monitoring means at all times, and the lack of manpower is often neglected for a long time. Following this flow, this paper proposes a method to detect defective modules by analyzing the images collected through the camera fixed to the front part of the LED display.

Design of Adaptive Current Control Circuits for LEDs (LED 정전류 적응 제어 회로 설계)

  • Lee, Kwang
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.12
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    • pp.8-14
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    • 2015
  • An effective way to ensure that LEDs produce wanted light output is to use a current driving topology, because the brightness of LEDs is directly related to their current. However, this topology may lead to the lifetime shortening of a illumination system because over-currents may flow through non-damaged LEDs in case some LEDs are damaged. This paper presents an adaptive current control circuits for LEDs, which protect LEDs in a good state by limiting the driving currents according to the number of damaged ones. The proposed control circuits consist of a simple constant-current driver and a micro-controller which monitors the voltage of LED array without any auxiliary current sensors for fault diagnosis. And the driving current is automatically controlled into 6-levels according to the number of failures.

putting out lights detector LED Type Signal light Test of a Patented Article Manufacture.Establishment.Examination Report (단심검지기(LED형 신호등용) 시제품 제작.설치.시험에 관한 보고)

  • Kho, Yeong-Whan;Seok, Tae-Woo;Ko, Yang-ok
    • Proceedings of the KSR Conference
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    • 2007.05a
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    • pp.1650-1655
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    • 2007
  • A lights-out detector, which helps the person in charge of maintenance make a quick judgment in the event of a failure of LED-type traffic lights, was explored/developed and installed/ tested, at Seoul Metro, after they developed a patented pilot product in 2005; and, a product improvement test was conducted to ensure reasonable maintenance of signaling facilities. Having better compatibility with existing circuit in use and displaying stable load current, the device makes the maintenance of lights-out detection and alert easier.

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Infrastructure Anomaly Analysis for Data-center Failure Prevention: Based on RRCF and Prophet Ensemble Analysis (데이터센터 장애 예방을 위한 인프라 이상징후 분석: RRCF와 Prophet Ensemble 분석 기반)

  • Hyun-Jong Kim;Sung-Keun Kim;Byoung-Whan Chun;Kyong-Bog, Jin;Seung-Jeong Yang
    • The Journal of Bigdata
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    • v.7 no.1
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    • pp.113-124
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    • 2022
  • Various methods using machine learning and big data have been applied to prevent failures in Data Centers. However, there are many limitations to referencing individual equipment-based performance indicators or to being practically utilized as an approach that does not consider the infrastructure operating environment. In this study, the performance indicators of individual infrastructure equipment are integrated monitoring and the performance indicators of various equipment are segmented and graded to make a single numerical value. Data pre-processing based on experience in infrastructure operation. And an ensemble of RRCF (Robust Random Cut Forest) analysis and Prophet analysis model led to reliable analysis results in detecting anomalies. A failure analysis system was implemented to facilitate the use of Data Center operators. It can provide a preemptive response to Data Center failures and an appropriate tuning time.

A Study on the Implementation and Development of Image Processing Algorithms for Vibes Detection Equipment (정맥 검출 장비 구현 및 영상처리 알고리즘 개발에 대한 연구)

  • Jin-Hyoung, Jeong;Jae-Hyun, Jo;Jee-Hun, Jang;Sang-Sik, Lee
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.15 no.6
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    • pp.463-470
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    • 2022
  • Intravenous injection is widely used for patient treatment, including injection drugs, fluids, parenteral nutrition, and blood products, and is the most frequently performed invasive treatment for inpatients, including blood collection, peripheral catheter insertion, and other IV therapy, and more than 1 billion cases per year. Intravenous injection is one of the difficult procedures performed only by experienced nurses who have been trained in intravenous injection, and failure can lead to thrombosis and hematoma or nerve damage to the vein. Nurses who frequently perform intravenous injections may also make mistakes because it is not easy to detect veins due to factors such as obesity, skin color, and age. Accordingly, studies on auxiliary equipment capable of visualizing the venous structure of the back of the hand or arm have been published to reduce mistakes during intravenous injection. This paper is about the development of venous detection equipment that visualizes venous structure during intravenous injection, and the optimal combination was selected by comparing the brightness of acquired images according to the combination of near-infrared (NIR) LED and Filter with different wavelength bands. In addition, an image processing algorithm was derived to threshehold and making blood vessel part to green through grayscale conversion, histogram equilzation, and sharpening filters for clarity of vein images obtained through the implemented venous detection experimental module.

Cystic Fibrosis: Clinical Phenotypes in Children and Adolescents

  • dos Santos, Ana Luiza Melo;de Melo Santos, Helen;Nogueira, Marina Bettiol;Tavora, Hugo Tadashi Oshiro;da Cunha, Maria de Lourdes Jaborandy Paim;de Melo Seixas, Renata Belem Pessoa;Monte, Luciana de Freitas Velloso;de Carvalho, Elisa
    • Pediatric Gastroenterology, Hepatology & Nutrition
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    • v.21 no.4
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    • pp.306-314
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    • 2018
  • Purpose: The objective of this study was to describe the clinical phenotypes of children and adolescents with cystic fibrosis (CF); and to assess the role of pancreatic insufficiency and neonatal screening in diagnosis. Methods: A cross-sectional study was conducted, which included 77 patients attending a reference center of CF between 2014 and 2016. Epidemiological data, anthropometric measurements, and the presence of pulmonary, pancreatic, gastrointestinal and hepatobiliary manifestations were evaluated based on clinical data and complementary examinations. Results: Of the 77 patients, 51.9% were male, with a median age of 147 months (7.0-297.0 months), and the majority showed adequate nutritional status. The most common phenotype was pulmonary (92.2%), followed by pancreatic (87.0%), with pancreatic insufficiency in most cases. Gastrointestinal manifestation occurred in 46.8%, with constipation being the more common factor. Hepatobiliary disease occurred in 62.3% of patients. The group with pancreatic insufficiency was diagnosed earlier (5.0 months) when compared to the group with sufficiency (84.0 months) (p=0.01). The age of diagnosis was reduced following implementation of neonatal screening protocols for CF (6.0 months before vs. 3.0 months after, p=0.02). Conclusion: The pulmonary phenotype was the most common, although extrapulmonary manifestations were frequent and clinically relevant, and should mandate early detection and treatment. Neonatal screening for CF led to earlier diagnosis in patients with pancreatic failure, and therefore, should be adopted universally.

Development of Leak and Vibration Monitoring System for High Pressure Steam Pipe by Using a Camera (카메라를 이용한 고압 증기 배관 누설/진동 감시시스템 개발)

  • Jeon, Hyeong-Seop;Suh, Jang-Su;Chae, Gyung-Sun;Son, Ki-Sung;Kim, Se-Oh;Lee, Nam-Hee
    • Journal of the Korean Society for Nondestructive Testing
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    • v.36 no.6
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    • pp.496-503
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    • 2016
  • Leakages at plant structures of power and petrochemistry plants have led to casualties and economic losses. These leakages are caused by fatigue failure of pipelines and their wall thickness. Vibration measurement methods for plant pipelines mainly use acceleration and laser sensors. These sensors are difficult to install and operate and thus lead to an increase in operational cost especially for wide area surveillance. Recently, measurements of leak and vibration displacements using cameras have attracted the interest of many researchers. This method has advantages such as simple installation, long distance monitoring, and wide area surveillance. Therefore, in this paper, we have developed a system that can measure the leakage and vibrational displacement by using a camera. Furthermore, the developed system was verified with experimental data.

Establishment of the High-Throughput Hair Roots' DNA Isolation System and Verification of Its Appicability for Hanwoo Traceability Using the 11 Microsatellite Makes (대량 모근 시료 DNA 분리 체계 확립과 11 microsatellite maker를 사용하는 한우 생산이력제로의 적용가능성 검증)

  • Lim, Hyun-Tae;Lee, Sang-Ho;Yoo, Chae-Kyoung;Sun, Du-Won;Cho, In-Cheol;Yoon, Du-Hak;Yang, Dae-Young;Cheong, Il-Cheong;Lee, Jung-Gyu;Jeon, Jin-Tae
    • Journal of agriculture & life science
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    • v.44 no.6
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    • pp.91-99
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    • 2010
  • We used a multiplex PCR primer set composed of 11 microsatellite (MS) markers and two sexing markers for gender detection. Genomic DNA extracted from hair roots of 3,510 Hanwoo were genotyped. Based on the 11MS markers, no animals had identical genotypes(TGLA227, BM2113, TGLA53, ETF10, SPS115, TGLA122, ETH3, ETH225, BM1824 and INRA23). The expected probability of identity among genotypes of random individuals (PI), the probability of identity among genotypes from random half-sibs ($PI_{half-sibs}$) and among genotypes of random individuals, and the probability of identity among genotypes from random sibs ($PI_{sibs}$) were estimated as $1.31{\times}10^{-23}$, $2.52{\times}10^{-16}$and $1.09{\times}10^{-6}$, respectively using the API-CALC program, version 1.0. We successfully completed the genotype analysis of 3,510 Hanwoo with a 3.93% genotyping failure rate. It was revealed that extracting DNA from the hair root was a time-efficient and cost-effective method to collect specimens for DNA isolation from live animals. This method also minimized stress for the animals during specimen collection. Among the hair roots from the back, belly, upper tail and lower tail, 5~13 hair roots of the lower tail led to the best genotype analysis results. Finally, we established a 96-well-format method of DNA preparation applicable for high- throughput genotype analysis.