• Title/Summary/Keyword: digital inspection

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Construction of the remote monitoring system for MX-13 digital multiplexer (광회선 다중화장치 원격감시시스템 구축)

  • Jang, Moon-Jong;Park, Byung-Seok;Ahn, Seong-Joon;Woo, Hee-Gon
    • Proceedings of the KIEE Conference
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    • 1999.07g
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    • pp.2947-2949
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    • 1999
  • The MX-13 digital multiplexer for leased line is one of the main facilities, so it is periodically monitored by the operator. Operators connect dummy terminal to the MX-13 digital multiplexer manually, and execute preventing inspection. When alarms occurred, they are manually checked by the operator. But, in order to get mere efficiency of accident prevention and monitoring facilities with rapid response to the accident symptom, and to get higher reliability from the companies who lease communication lines, we need to construct this system which is adequate to monitor IvlX-13 digital multiplexer in almost real time. We construct remote monitoring system for MX-13 digital multiplxer to meet those requirement. After constructing the system, it's possible that the local operator can manage local monitoring system to check the status of MX-13 digital multiplexers. Also, Center operator can monitor the facility which has problems, and located in the specific local areas with the use of Center monitoring system.

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Development for Automatic Thickness Measurment System by Digital Image Processing (디지탈 영상처리 기법을 이용한 자동 두께측정 장치 개발)

  • Kim, Y.I.
    • Journal of the Korean Society for Precision Engineering
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    • v.12 no.6
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    • pp.72-79
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    • 1995
  • The purpose of this paper is to develop an automatic measuring system based on the digital image processing which can be applied to the in-process measurment of the characteristics of the thin thickness. The derivative operators is used for edge detection in gray level image. This concept can be easily illustrated with the aid of object shows an image of a simple light object on a dark background, the gray level profile along a horizontal scan line of the image, and the first and second derivatives of the profile. The first derivative of an edge modeled in this manner is 0 in all regions of constant gray level, and assumes a constant value during a gray level transition. The experimental results indicate that the developed automatic inspection system can be applied in real situation.

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Development of Dual Energy Radiation Detector (이중 에너지 방사선 검출기 개발)

  • Yeo, Hwa-Yeon
    • Journal of the Korean Society of Radiology
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    • v.4 no.3
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    • pp.5-11
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    • 2010
  • In this paper, we are suggested development of dual-mode detector for dual-energy digital radiography. Design of dual-energy radiography module for commercial BIS (Baggage Inspection System) is used in the spectrum of the X-ray generator and detector for dual-mode features and radiological characteristics were analyzed. BIS suggestl on the image detector module being used to target X-ray tube to simulate X-ray spectrum and simulated spectrum to offer through the new radiographic characteristics of the detector modules were investigated. Using X-ray experiments with an increase in the thickness of the copper filter low energy detector (LED) and high-energy detector (HED) as the difference between the output signal increases. HED, especially in the size of the output signal decreases with increasing thickness of the copper filter was found.

DLNA Protocol Inspection Tool for Compatibility Analysis

  • Park, Se-Ho;Park, Yong-Suk;Seo, Jeong-Wook;Choi, Jun-Rim
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.8 no.6
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    • pp.2104-2117
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    • 2014
  • The propagation of smart devices and the rapid expansion of wireless mobile networks have increased the need for ubiquitous device connectivity and contents access. DLNA is currently being used as the de facto standard for connectivity of consumer devices in the digital home. The guidelines provided by DLNA are intended to facilitate device and contents discovery, management, sharing and distribution. However, consumer experience with DLNA has been rather poor and usability not up to speed. Different problems and issues in limited compatibility have been reported due to manufacturer customizations. Such compatibility issues are often difficult to identify by average consumers who are not savvy in information communications and multimedia technology. In this paper, the design and implementation of a DLNA protocol inspection tool is presented for compatibility analysis among DLNA certified devices. The tool monitors the home network and performs analysis of the underlying protocols used by DLNA. The tool can be used for diagnostics and troubleshooting, enabling the user to identify compatibility issues between devices or problems in the network.

3-Dimensional Shape Measurement System for BGA Balls Using PMP Method (PMP 방식을 이용한 BGA 볼의 3차원 형상측정 시스템)

  • Kim, Hyo Jun;Kim, Joon Seek;Joo, Hyonam
    • Journal of Institute of Control, Robotics and Systems
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    • v.22 no.1
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    • pp.59-65
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    • 2016
  • As modern electronic devices get smaller and smaller, high-resolution, large Field-Of-View (FOV), fast, and cost-effective 3-dimensional (3-D) measurement is requested more and more. In particular, defect inspection machines using machine-vision technology nowadays require 3-D inspection as well as the conventional 2-D inspection. Phase Measuring Profilometry (PMP) is one of the fast non-contact 3-D shape measuring methods currently being extensively investigated in the electronic component manufacturing industry. The PMP system is well known and is successfully applied to measuring complex surface profiles with varying reflectance properties. However, for highly reflective surfaces, such as Ball Grid Arrays (BGAs), it has difficulty accurately measuring 3-D shapes. In this paper, we propose a new fast optical system that can eliminate the highly reflective saturated regions in BGA ball images. This is achieved by utilizing four Low Intensity Grating (LIG) images together with the conventional High Intensity Grating (HIG) images. Extensive experiments using BGA samples show a repeatability of under ${\pm}20um$ in standard deviation, which is suitable for most 3-D shape measurements of BGAs.

Development of Ultrasonic Inspection System and Application to Overlay Weld Flaw Detection (초음파 자동 검사시스템의 개발과 오버레이 용접부의 결함검사)

  • Nam, Young-Hyun;Seong, Un-Hak
    • Journal of the Korean Society for Nondestructive Testing
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    • v.20 no.6
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    • pp.562-567
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    • 2000
  • Many pressure vessels for power and industrial plant are fabricated from low alloy carbon steels. The inner sides of pressure vessels are commonly weld-cladded with austenitic stainless steels to minimize problems of corrosive attack. Disbonding cracks are often detected at the transition region of welding interlayer, which is serious problem to reliability of pressure vessels. We have developed C-scan system to high speed inspection of overlay weld using DSP(digital signal processor). This system consists of signal processing parts (oscilloscope, pulser/receiver, digitizer, DSP), scanner, program and position controller. The developed system has been applied to a practical ultrasonic testing in overlay weld, and demonstrated high speed with precision

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Measurement of Internal Defects of Pressure Vessels using Unwrapping images in Digital Shearography (Digital Shearography 에서 Unwrapping 이미지와 FEM 을 이용한 압력용기의 내부결함 측정)

  • Kim, Seong-Jong;Kang, Young-June;Sung, Yeon-Hak;Ahn, Yong-Jin
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.1
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    • pp.48-55
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    • 2012
  • Pressure vessels in vehicle industries, power plants, and chemical industries are often affected by flaw and defect generated inside the pressure vessels due to production processes or being used. It is very important to detect such internal defects of pressure vessel because they sometimes bring out serious problems. In this paper, an optical defect detection method using digital shearography is used. This method has advantages that the inspection can be performed at a real time measurement and is less sensitive to environmental noise. Shearography is a laser-based technique for full-field, non-contacting measurement of surface deformation (displacement or strain). The ultimate goal of this paper is to detect flaws in pressure vessels and to measure the lengths of the flaws by using unwrapping, phase images which are only obtained by Phase map. Through this method, we could decrease post-processing (next processing). Real length of a pixel can be calculated by comparing minimum and maximum unwrapping images with shearing angle. Through measuring several specimen defects which have different lengths and depths of defect, it can be possible to interpret quantitatively by calculating gray level.

A Study on Performance Reduction Characteristics of Digital Wireless Communication by APD (APD 통계 모델에 의한 디지털 무선 통신 성능 저감 특성 연구)

  • Lim, Sung-Jin;Hur, Min-Ho;Kwon, Se-Woong;Yoon, Young-Joon
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2003.11a
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    • pp.8-12
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    • 2003
  • To protect digital communications and broadcasting that are expected to be increasingly used at frequencies above 1GHz, there is a need to determine permissible disturbance limits for frequency bands above 1GHz according to indicates that better correlates with interference level in digital systems. The quality of digital communications is expressed in terms of bit error rate(BER) or throughput. In this regard, it has been reported that degradation of BER or throughput can be estimated from the amplitude probability distribution (APD) of disturbance amplitude. Therefore, if the APD can simply be measured with a high accuracy, APD will be an optimal index for the assessment of interference in digital communications. In this paper, we show that a measurement method using statistic model of APD has compatibility about performance reduction estimation of WLAN. And through approach of this inspection, we propose numeral models about interference effects of peak value and time rate of spurious.

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Development of Digital Signal Processing Board for Detection Array Module Signal Processing System (Array 검출 Module 신호처리 System의 Digital Signal Processing Board 개발)

  • Park, Ge-O;Sung, So-Young;Kim, Young-kil
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2017.05a
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    • pp.375-378
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    • 2017
  • Shipping and logistics safety, security system is strengthening worldwide, the development of shipping and logistics safety security core technology for national security logistics system construction has been carried out. In addition, it is necessary to localize the Array Detection System, which is a core component of the container search machine, to cope with the 100% pre-inspection of the container scheduled for 2018 in the United States. In this paper, we propose a study on a self-developed Digital Signal Processing Board among the array detection systems that replace foreign products.

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Detecting Digital Micromirror Device Malfunctions in High-throughput Maskless Lithography

  • Kang, Minwook;Kang, Dong Won;Hahn, Jae W.
    • Journal of the Optical Society of Korea
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    • v.17 no.6
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    • pp.513-517
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    • 2013
  • Recently, maskless lithography (ML) systems have become popular in digital manufacturing technologies. To achieve high-throughput manufacturing processes, digital micromirror devices (DMD) in ML systems must be driven to their operational limits, often in harsh conditions. We propose an instrument and algorithm to detect DMD malfunctions to ensure perfect mask image transfer to the photoresist in ML systems. DMD malfunctions are caused by either bad DMD pixels or data transfer errors. We detect bad DMD pixels with $20{\times}20$ pixel by white and black image tests. To analyze data transfer errors at high frame rates, we monitor changes in the frame rate of a target DMD pixel driven by the input data with a set frame rate of up to 28000 frames per second (fps). For our data transfer error detection method, we verified that there are no data transfer errors in the test by confirming the agreement between the input frame rate and the output frame rate within the measurement accuracy of 1 fps.