• Title/Summary/Keyword: nondestructive sampling

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Determining the Optimum Target Value for Filling Operations with Nondestructive Sampling Plans (비파괴 샘플링 계획을 갖는 Filling 작업에 대한 최적 목표치 결정)

  • Goh, Hyun Woo;Hwang, Eui Cheol
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.14 no.24
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    • pp.187-192
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    • 1991
  • We consider a filling process problem on a production line. Up to present this problem have examined by 100% inspection. Thus a target value is determined which takes into account the regular selling prices, the reprocess cost, the excess quality cost and the process variability and so on. However, in this paper we propose a solution under specified sampling plan when the inspection is nondestructive.

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Design of Economic Screening Inspection Plan for Protecting Given LTPD (LTPD보증을 위한 경제적선별검사방식의 설계)

  • 김광섭
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.11 no.18
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    • pp.27-34
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    • 1988
  • This study is concerned with the development of the economic sampling inspection plan when it is possible to carry out a nondestructive screening inspection for the rejected lots by substitutive characteristics closely related to the original quality characteristic. It is assumed that the probabilities of those errors depend linearly on the fraction defective of the process sampling inspection policy for isolated lot is studied where the probability of accepting the lot with bad quality from the results of sampling inspection is restricted to be small.

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A Study on the Application Method of Various Digital Image Processing in the IC Package (IC-패키지에 대한 각종 디지탈 화상처리 기술의 적용방법에 대한 연구)

  • Kim, Jae-Yeol
    • Journal of the Korean Society for Nondestructive Testing
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    • v.12 no.4
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    • pp.18-25
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    • 1993
  • This paper is to aim the microdefect evaluation of If package into a quantitative from NDI's image processing of ultrasonic wave. (1) Automatically repeated discrimination analysis method can be devided in the category of all kind of defects on IC package, and also can be possible to have a sampling of partial delamination. (2) It is possible that the information of edge section in silicon chip surrounding can be extractor by the partial image processing of IC package. Also, the crack detection is possible between the resin part and lead frame.

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Estimation for Seaweed Biomass Using Regression: A Methodological Approach (회귀분석을 이용한 해조류 생물량 측정을 위한 방법론)

  • Ko, Young-Wook;Sung, Gun-Hee;Kim, Jeong-Ha
    • ALGAE
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    • v.23 no.4
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    • pp.289-294
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    • 2008
  • To estimate seaweed biomass or standing crop, a nondestructive sampling can be beneficial because of not much destroying living plants and saving time in field works. We suggest a methodological procedure to estimate seaweed biomass per unit area in marine benthic habitats by using species-specific regression equations. Percent cover data are required from the field samplings for most species to convert them to weight data. However, for tall macroalgae such as kelps we need density data and their size (e.g., size class for subtidal kelps) of individuals. We propose that the field sampling should be done with 5 replicates of 50 cm x 50 cm quadrat at three zones of intertidals (upper, middle, lower) and three depth points (1, 5, 10 m) in subtidals. To obtain a reliable regression equation for a species, a substantial number of replicate is necessary from destructive samplings. The regression equation of a species can be further specified by different locality and different season, especially for the species with variable morphology temporally and spatially. Example estimation carried out in Onpyung, Jeju Island, Korea is provided to compare estimated values with real weight data.

A Study on the Economical Design of Sampling Inspection Plan by Attribute (계수선별형(計數選別型) 샘플링검사(檢査)의 경제성(經濟性)에 관한 연구(硏究))

  • Lee, Byeong-Geun;Jeon, Jae-Gyeong
    • Journal of Korean Society for Quality Management
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    • v.13 no.2
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    • pp.48-55
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    • 1985
  • This paper intends to decide the optimum OC curves and to find the minimized ${\alpha}$, ${\beta}$-risk based upon the Linear Cost Model (L.C.M.) for the destructive or nondestructive acceptance sampling inspection plan. For the solution from the L.C.M., we assume the uniform distribution as a Prior-distribution and use numerical analysis by computer.

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Imaging of Harmonic Wave Generated by Contact Acoustic Nonlinearity in Obliquely Incident Ultrasonic Wave (경사입사 초음파에서 계면 접촉 음향 비선형성에 의해 발생한 고조파의 영상화)

  • Yun, Dong-Seok;Choi, Sung-Ho;Kim, Chung-Seok;Jhang, Kyung-Young
    • Journal of the Korean Society for Nondestructive Testing
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    • v.32 no.4
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    • pp.362-368
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    • 2012
  • The objective of this study is to image the harmonic wave generated by contact acoustic nonlinearity in obliquely incident ultrasonic wave for early detection of closed cracks. A closed crack has been simulated by contacting two aluminum block specimens producing solid-solid contact interfaces and then acoustic nonlinearity has been imaged with contact pressure. Sampling phased array(SPA) and synthetic aperture focusing technique(SAFT) are used for imaging techniques. The amplitude of the fundamental frequency decreased with appling pressure. But, the amplitude of second harmonic increased with pressure and was a maximum amplitude at the simulation point of closed crack. Then, the amplitude of second harmonic decreased. As a result, harmonic imaging of contact acoustic nonlinearity is possible and it is expected to be apply for early detection of initial cracks.

Construction of a Ginsenoside Content-predicting Model based on Hyperspectral Imaging

  • Ning, Xiao Feng;Gong, Yuan Juan;Chen, Yong Liang;Li, Hongbo
    • Journal of Biosystems Engineering
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    • v.43 no.4
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    • pp.369-378
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    • 2018
  • Purpose: The aim of this study was to construct a saponin content-predicting model using shortwave infrared imaging spectroscopy. Methods: The experiment used a shortwave imaging spectrometer and ENVI spectral acquisition software sampling a spectrum of 910 nm-2500 nm. The corresponding preprocessing and mathematical modeling analysis was performed by Unscrambler 9.7 software to establish a ginsenoside nondestructive spectral testing prediction model. Results: The optimal preprocessing method was determined to be a standard normal variable transformation combined with the second-order differential method. The coefficient of determination, $R^2$, of the mathematical model established by the partial least squares method was found to be 0.9999, while the root mean squared error of prediction, RMSEP, was found to be 0.0043, and root mean squared error of calibration, RMSEC, was 0.0041. The residuals of the majority of the samples used for the prediction were between ${\pm}1$. Conclusion: The experiment showed that the predicted model featured a high correlation with real values and a good prediction result, such that this technique can be appropriately applied for the nondestructive testing of ginseng quality.

Study on Source Waye hnalysis in Crack Growth by AE Method (AE법(法)에 의한 균열성장의 Source Wave해석(解析)에 관(關)한 연구(硏究))

  • Han, Eung-Kyo;Kim, Tong-Kyu;Choi, Man-Yong;Kim, Kyung-Suk
    • Journal of the Korean Society for Nondestructive Testing
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    • v.3 no.2
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    • pp.5-12
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    • 1984
  • The purpose of this paper is to decide volume of crack by AE source wave analysis. The material studied in this paper was Titanium Alloy. Transient wave memory has 50 nano sampling time. The response function of specimens and transducer was obtained experimentally by use of specimens and transducer was obtained experimentally by use of breaking pencil lead as a reference simulated AE source, and the source waves were dertermined in terms of energy release-time functions explicitly through a time domain deconvolution. From experimental results, we can determine size of cracked volume.

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A Study on The Compressive Strength Correlation by Various Nondestructive Test Method (각종 비파괴 검사법에 의한 압축강도 상관연구)

  • 최원호;신도철;이대우
    • Proceedings of the Korea Concrete Institute Conference
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    • 1998.10b
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    • pp.767-772
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    • 1998
  • schumidt hammer and ultra-sonic method are commonly used for concrete compressive strength test in a construction field. At present, various kinds of equations for estimation of strength are present, which have been used in a construction field. The purpose of this study is to evaluate the correlation between estimation strength by presentation equations and destructive strength to test specimen, and find out which is a suitable equation for this construction site. In this study, a strength test was carried out destructive test by means of core sampling. Non destructive test was conducted Schumidt hammer and ultra-sonic method, the experimental parameter were concrete age, test method and strength level. It is demonstrated that the correlation behavior of concrete strength in this study good due to the performs analysis of correlation between core strength and nondestructive strength.

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수입검사(受入檢査)의 경제성(經濟性)에 관한 연구(硏究) - 계수형(計數型)샘플링검사(檢査)를 중심(中心)으로 -

  • Kim, Gwang-Seop;Lee, Gyeong-Hak
    • Journal of Korean Society for Quality Management
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    • v.7 no.1
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    • pp.26-34
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    • 1979
  • This paper intends to decide the optimum OC curves and to find the minimized ${\alpha},{\beta}$-risk based upon the Linear Cost Model (L. C. M.) for the destructive or nondestructive acceptance sampling inspection plan. For the solution from the L. C. M., the author used the prior-distribution on some assumptions.

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