• Title, Summary, Keyword: Convergence measurement

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A study on improvement of convergent measurement performance of color display tube using photo sensors (포토 센서를 이용한 브라운관의 컨버젼스 측정 성능 향상에 관한 연구)

  • ;;Zeungnam Bien
    • Journal of the Korean Institute of Telematics and Electronics S
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    • v.35S no.3
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    • pp.93-101
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    • 1998
  • In Integrated Tube Components(ITC) process in themanufacturing of color display tube, we describe the necessity of the convergence measurement method using photo sensors. Compared with methods using 1D or 2D cameras, its characteristics is to use of moving image patterns and fixed sensors. This measurement method is formulated as the measurement problem of the phase difference in phase changing periodic signals. The convergence measurement system using photo sensors, for the good performance, must have a small standard deviation for the repetitive measurement in the same condition and a fast measurement time for thecovergence change. By above two conditions, we proposed the real time measurement algorithm of the pahse difference using fundametal and harmonic in phase changing periodic signals. And, the proposed algorithm is applied to the convergence measurement system.

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Case Studies of Automatic Measurement and strength for Damage in the Public Tunnel (공용중인 터널의 변상에 대한 보강 및 자동화계측 사례)

  • Han Ja-Jung;Kim Young-Ho;Jang Gi-Soo;Kweon Young-Jung;Ahn Sang-Ro
    • 한국터널공학회:학술대회논문집
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    • pp.270-281
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    • 2005
  • An especial attention for old tunnel safety is required on increasing of The various tunnel recently. Specially, the lining investigation method of the old tunnel will be able to presume condition of concrete lining indirectly. Because it is many restriction thought of environment and ground condition investigation method of tunnel lining rear. This study carried out section & convergence measurement of part which was deformed in tunnel lining. It had been observed for the change of tunnel behavior with a continuous measurement. It has been analyzed for a cause of tunnel deformation and inspected for the effect after a repair-reinforcement to tunnel compared with the effect before those by structure analysis. By establishing automatic measurement system after repair-reinforcement to tunnel, it would be accomplished to convergence measurement continually. As a result, it was observed that deflection and deformation of tunnel was convergent. but it should be followed to a continuous maintenance because of unstable ground condition, cause of inner tunnel, environment. The railroad tunnel which was executed a reinforcement of the tunnel lining must investigate the close condition of reinforcement lining and concrete lining.

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Convergence Analysis of a Filtered-x Least Mean Fourth Active Noise Controller (Filtered-x 최소평균사승 능동 소음 제어기 수렴분석)

  • 이강승
    • Proceedings of the Acoustical Society of Korea Conference
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    • pp.80-83
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    • 1998
  • In this paper, we propose a new filtered-x least mean fouth (LMF) algorithm where the error raised to the power of four is minimized and analyze its convergence behavior or a multiple sinusoidal acoustic noise and Gaussian measurement noise. Application of the filtered-x LMF adaptive filter to active noise cancellation (ANC) requires estimating of the transfer characteristic of the acoustic path between the ouput and error signal of the adaptive canceller. The results of the convergence analysis of the filtered-x LMF algorithm indicates that the effects of the parameter estimation inaccuracy on the convergence behavior of the algorithm are characterized by two distinct component . Phase estimation error and estimated again. In particular , the convergence is shown to be strongly affected by the accuracy of the phase response estimate. Also, we newly show that convergence behavior can differ depending on the relative sizes of the Gaussian measurement noise and convergence constant.

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The Filtered-x Least Mean Fourth Algorithm for Active Noise Cancellation and Its Convergence Behavior

  • Lee, Kang-Seung
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.26 no.12A
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    • pp.2050-2058
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    • 2001
  • In this paper, we propose the filtered-x least mean fourth (LMF) algorithm where the error raised to the power of four is minimized and analyze its convergence behavior for a multiple sinusoidal acoustic noise and Gaussian measurement noise. Application of the filtered-x LMF adaptive filter to active noise cancellation (ANC) requires estimating of the transfer characteristic of the acoustic path between the output and error signal of the adaptive controller. The results of 7he convergence analysis of the filtered-x LMF algorithm indicates that the effects of the parameter estimation inaccuracy on the convergence behavior of the algorithm are characterized by two distinct components : Phase estimation error and estimated gain. In particular, the convergence is shown to be strongly affected by the accuracy of the phase response estimate. Also, we newly show that convergence behavior can differ depending on the relative sizes of the Gaussian measurement noise and convergence constant.

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The Filtered-x Least Mean Fourth Algorithm for Active Noise Control and Its Convergence Analysis

  • Lee, Kang-Seung;Youn, Dae-Hee
    • The Journal of the Acoustical Society of Korea
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    • v.15 no.3E
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    • pp.66-73
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    • 1996
  • In this paper, we propose the filtered-x least mean fourth (LMF) algorithm where the error raised to the power of four is minimized and analyze its convergence behavior for a multiple sinusoidal acoustic noise and Gaussian measurement noise. Application of the filtered-x LMF adaptive filter to active noise control(ANC) requires estimating of the transfer characteristic of the acoustic path between the output and error signal of the adaptive controller. The results of the convergence analysis of the filtered-x LMF algorithm indicates that the effects of the parameter estimation inaccuracy on the convergence behavior of the algorithm are characterized by two distinct components : Phase estimation error and estimated gain. In particular, the convergence is shown to be strongly affected by the accuracy of the phase response estimate. Also, we newly show that convergence behavior can differ depending on the relative sizes of the Gaussian measurement noise and convergence constant.

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A New Measurement to Understand Convergence Phenomenon

  • Kim, Keun-Hwan;Moon, Yeong-Ho
    • Asian Journal of Innovation and Policy
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    • v.2 no.1
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    • pp.37-62
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    • 2013
  • Many scholars have persevered in understanding the convergence process by developing a measurement that reflects the characteristics of the convergence phenomenon as a process. Recently a series of studies suggested a framework in terms of diversity and coherence. However, an index for coherence is required to reflect the vital features of the conceptual definition, and thus a new index for coherence is proposed in this paper. Technology Convergence Index combines diversity and coherence and indicates the degree of the convergence in information computer technology (ICT), biotechnology (BT) and nanotechnology (NT) sectors. The index can not only be used to track each technology field that consists of a major technology sector, but also to compare other leading countries. Based on a comparison study between the United States and South Korea, the degrees of technology convergence of Korea in ICT, BT, and NT sectors have ameliorated.

The Software Reliability Growth Model base on Software Error Data (소프트웨어 오류 데이터를 기반으로 한 소프트웨어 신뢰성 성장 모델 제안)

  • Jung, Hye-Jung;Han, Gun-Hee
    • Journal of the Korea Convergence Society
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    • v.10 no.3
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    • pp.59-65
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    • 2019
  • In this paper, we propose a software quality measurement metrics of ISO / IEC 25023, which is newly proposed for software quality evaluation, to compare the difference with ISO / IEC 9126-2 which was used for software quality evaluation. In this paper, we propose a method for evaluating the quality of reliability based on the software reliability growth model among the eight quality characteristics presented in ISO / IEC 25023. Based on ISO / IEC 25023, software-quality evaluations demonstrate that there is some risk in evaluating reliability when based on data.

MULTI-POINT MEASUREMENT OF STRUCTURAL VIBRATION USING PATTERN RECOGNITION FROM CAMERA IMAGE

  • Jeon, Hyeong-Seop;Choi, Young-Chul;Park, Jin-Ho;Park, Jong-Won
    • Nuclear Engineering and Technology
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    • v.42 no.6
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    • pp.704-711
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    • 2010
  • Modal testing requires measuring the vibration of many points, for which an accelerometer, a gab sensor and laser vibrometer are generally used. Conventional modal testing requires mounting of these sensors to all measurement points in order to acquire the signals. However, this can be disadvantageous because it requires considerable measurement time and effort when there are many measurement points. In this paper, we propose a method for modal testing using a camera image. A camera can measure the vibration of many points at the same time. However, this task requires that the measurement points be classified frame by frame. While it is possible to classify the measurement points one by one, this also requires much time. Therefore, we try to classify multiple points using pattern recognition. The feasibility of the proposed method is verified by a beam experiment. The experimental results demonstrate that we can obtain good results.

Convergence review of self-care measurement instrument in diabetic nephropathy (당뇨병성 신증의 자가 관리 측정도구 고찰에 대한 융합연구)

  • Jun, Young-Hee;Song, Young-Shin
    • Journal of the Korea Convergence Society
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    • v.9 no.10
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    • pp.467-475
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    • 2018
  • The purpose of this study was to describe self-management related to diabetic nephropathy(DN) patients and analyze instrument for measurement of self-management. Literature search was conducted using computerized databases such as Pubmed, CINAHL, Embase, and Cochrane. The search term of this study were "Diabetes Mellitus", "Self-care", "Kidney Disease". A total of 8 articles were collected and 8 measurement instruments used in the study. But, included studies were assessing the self-management for DN using non-DN specific instruments. Thus, DN specific instrument for measuring the self-care should be developed in future study.

Integer Programming Approach to the Convergence Adjustment on Color Display Tube

  • Park, Sungsoo;Kang, Donghan;Lee, Hyohyung;Hong, Cheol-Kee
    • Industrial Engineering and Management Systems
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    • v.3 no.1
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    • pp.63-70
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    • 2004
  • In this paper, we consider the adjustment of convergence on Color Display Tube (CDT). Convergence is a measure of how well the red, green and blue beams are physically aligned with each other to strike the same area on the screen. When misconvergence (convergence error) occurs, one way of compensating it is to attach several ferrite sheets on the inner part of Deflection Yoke (DY). We suggest an optimization model of misconvergence compensation process and report test results for 81 DY samples. As a result, more than 90% of the samples could be made to satisfy the required convergence criteria.