• Title/Summary/Keyword: detection technique

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Prediction Principle and System Structure for the Detection of Incipient Electrical Fire (전기화재 예지원리 및 징후검출 시스템 구조)

  • 김창종
    • The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.9 no.4
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    • pp.71-77
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    • 1995
  • Electrical fire in residential, commercial, and industrial areas occupies 40 percent of overall fire accidents as of the year of 1994. The causes of most electrical fires were studied and, based on this investigation, the principle of the early detection or prediction of the electrical fires is developed. The basic principle is to early detect electrical arcs or sparks caused by faulty connections and insulation failures. the structure of the prediction system based on microcontroller technique is presented.

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Noise Whitening-Based Pitch Detection for Speech Highly Corrupted by Colored Noise

  • Byun, Kyung-Jin;Jeong, Sang-Bae;Kim, Hoi-Rin;Hahn, Min-Soo
    • ETRI Journal
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    • v.25 no.1
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    • pp.49-51
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    • 2003
  • Pitch estimation is important in various speech research areas, but when the speech is noisy, accurate pitch estimation with conventional pitch detectors is almost impossible. To solve this problem, we propose a new pitch detection algorithm for noisy speech using a noise whitening technique on the background noise and obtain successful results.

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A Study on the Disbonding Detection of FRP Honeycomb Sandwich Structure by Ultrasonic Methods (초음파를 이용한 복합재료 하니캄 구조물의 Disbonding 검출에 관한 연구)

  • Cho, K.S.;Lee, J.S.;Lee, J.O.;Chang, H.K.;Lee, S.H.
    • Journal of the Korean Society for Nondestructive Testing
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    • v.11 no.1
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    • pp.23-30
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    • 1991
  • In this study the bonding quality evaluation of FRP honeycomb structure was performed by the ultrasonic C-Scan method and stress wave factor measurements. These NDT techniques could be well applied to the disbonding detection of FRP honeycomb structures. Especially, stress wave factor (SWF) measurement is expected to be a useful technique in field applications.

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Real-Time Voltammetric Assay of Lead Ion in Biological Cell Systems

  • Ly, Suw-Young
    • Toxicological Research
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    • v.25 no.4
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    • pp.231-235
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    • 2009
  • Trace lead detection for cyclic voltammetry (CV) and square-wave (SW) stripping voltammetry was performed using mercury immobilized onto a carbon nanotube electrode (HNPE). Using the characteristics of mercury and the catalytic carbon nanotube structure, a modified technique, the $0.45{\mu}g/l$ detection limit of lead ion was attained. The developed method can be applied to pond water, fish tissue, plant tissue, and in vivo direct assay.

A New Technique for Burst Cartridge Detection

  • Hyun, Kyung-Ho
    • Nuclear Engineering and Technology
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    • v.1 no.1
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    • pp.5-16
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    • 1969
  • A design of new burst cartridge detection system for gas-cooled power reactor using a spherical sampling chamber with negative electrode is presented. The results of theoretical calculation indicate that the designed system is feasible for a practical application and sensitive enough to detect a 1 $\textrm{cm}^2$ hole in the fuel clad-ding.

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Variable threshold estimation for performance improvement of vehicle detection RADAR (차량 감지용 레이다 성능 향상을 위한 가변 threshold 설정 기법)

  • 박상진;김태용;강성민;구경헌
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2002.11a
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    • pp.196-199
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    • 2002
  • In this paper, variable threshold estimation algorithm for multiple vehicle detection RADAR is proposed and realized by using DSP for real time processing. The algorithm is developed to get the information of velocity and length of vehicles in multiple lanes by using FMCW RADAR. For real time operation, signal processing part is realized with a high speed DSP board to detect and manipulate the vehicle data and some experimental results are given to show the usefulness of the proposed technique.

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Feature engineering with Wavelet transform for Transient detection in KMTNet Supernova Project

  • Lee, Jae-Joon
    • The Bulletin of The Korean Astronomical Society
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    • v.42 no.2
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    • pp.64.3-64.3
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    • 2017
  • For the detection of transient sources in optical wide field surveys like KMTNet Supernova Project, difference imaging technique is commonly used. As this method produces a fair amount of false positives, it is also common to utilize machine learning algorithms to screen likely true positives. While deep learning methods such as a convolutional neural network has been successfully applied recently, its application can be limited if the size of the training sample is small. I will discuss a variation of more conventional method that adopts the wavelet transform for feature engineering and its performance.

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Fault detection of rotating machine elements by wideband spectral histogram analysis (Wideband spectral histogram 분석에 의한 회전기계 요소의 결함탐지)

  • 정완섭;은희준;임병덕
    • 제어로봇시스템학회:학술대회논문집
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    • 1986.10a
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    • pp.123-127
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    • 1986
  • The use of vibration signal for fault detection inside a machine (or its part) is not new, and a number of signal processing techniques are available at the moment. A common problem for all such techniques is the high level of background signals which often made it very difficult to distinguish the desired signals. We developed a new algorithm to detect the minute faults of rotating part based on spectral histogram analysis. The technique has subsequently been applied to the bearings and has proved to be useful.

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Zero Crossing Switching Method for PWM Converter in Rolling stock (철도차량 PWM Converter Zero Crossing 스위칭 기법)

  • Kim, Jin-Yong;Kim, Yen-Chung;Park, Sung-Ho
    • Proceedings of the KSR Conference
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    • 2010.06a
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    • pp.564-570
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    • 2010
  • Last train of the vehicle for eht energy saving and improved performance PWM converters ares widely used. In the case of PWM converters by the zero detection system performance depends on whether it can be argued. Zero voltage detectio method of the hardware and software approach is to in this paper, the zero detection methods for hardware and software problems that have occured as a complemnetary technique was expained.

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