• Title/Summary/Keyword: Measurement standards

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Economic Effect of National Measurement Standards (측정표준의 국민경제 기여효과 분석)

  • 안병덕;남경희;안웅환;김동진;조연상
    • Journal of Korea Technology Innovation Society
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    • v.5 no.2
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    • pp.245-256
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    • 2002
  • Measurement standards, as being widely recognized, is necessary for national economic development and advanced industrialization. Also measurement standards give reliability and fair trade to the producers and consumers. Macro-effect of measurement standards using estimation of cost function has four effects: 1) value-added causing effect, 2) effect of employment, 3) reduction effect transaction cost, 4) reduction effect defect rates. In this study, to investigate the impacts between specific and the other industries, we used I-O Table of Korea Bank. The relation between the value-added produced by original production factors and final use is determined through production level, and the relation can be investigated with production causing coefficient matrix. In this study, it was showed that the measurement standards investments including measurement only man power of industries were increased from 1995 rapidly. The establishment and maintenance of measurement standards contributes to reduce the defect rate of products in production process and improve the confidence of the product quality. The results from this study show that measurement technology contributes to improve quality, decrease defect rate, improve production process, develope new products, reduce prime cost and increase the consumer's confidence on the firms. Since these results indicate that measurement standards are very important in the point of their vast contribution, we hope our findings can contribute to encourage measurement activities in industries.

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A Comparative Study for Odor Control Regulations (악취관리제도의 국가간 비교연구)

  • 양성봉;김석만
    • Journal of Korean Society for Atmospheric Environment
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    • v.16 no.1
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    • pp.79-87
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    • 2000
  • This study analyzed the regulations concerning odor management or control in Korea, Japan, and developed countries such as USA and Germany. The Korean restriction standards and measurement methods for offensive odor substances are very similar to the Japanese standards and methods promulgated in 1976. Japan promulgated the odor control act and the specific measurement methods of the offensive odor substances in 1973. In Japan, currently, the local governments can establish their own odor restriction areas and proclaim their own standards suitable for their situations. Also, Japan has more strict regulations and more offensive odor substances to be monitored than Korea. The restriction standards of odor in German is quite similar to the permissible limits and standards of air pollutants at emission sources in Korea. Many states in USA are adopting their own restriction standards and measurement methods, e.q., the ambient air pollution standards, organic functionstest methods by dilation, and establishment and addition of air pollution control equipment at emission sources. Finally, this study analyzed the problems of the regulations, standards, and measurement methods concerning the Korean offensive odor management. Since the direct organic fuctions measurement(DOFMM) method is depending upon the personal sensitives of odor substances, the measurement odor value can be equivocal. That is, the odor measurement value by an examines can differ from that by the other examines. Also, there can be conflicts with the measured odor values depending upon the applied measurement methods, e.q., the DOFMM, the dilation method, and the instrumental analysis method.

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Development of the Nursing Process Based Performance Measurement Tool for Medication Management and Blood Transfusion (투약과 수혈간호의 간호과정 적용 평가도구 개발)

  • Kim, Keum Soon;Kim, Jin A;Kwon, So Hi;Song, Mal Soon
    • Journal of Korean Clinical Nursing Research
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    • v.16 no.1
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    • pp.177-196
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    • 2010
  • Purpose: This study was conducted to develop the nursing process based performance measurement tool and the evidence based care standards for nursing care in medication management and blood transfusion. Methods: The care standards and performance measurement tool were drafted through comprehensive review of relevant literature, national guidelines, hospital protocols, and standards of recognized international accrediting bodies. The proposed care standards and performance measurement tool were reviewed by the panel of experts and refined based on the panel's suggestions. Final care standards and performance measurement tool were validated by surveying the hospital nurses. Results: All items of the performance measurement tool for medication management and blood transfusion were evaluated appropriate. All contents of care standards and the measurable elements except the evaluation of discharge education were appropriate. The performance measurement tool developed in this study was found to be acceptable as a tool to evaluate quality of nursing care in medication management and blood transfusion. Conclusion: The outcomes of this study including the performance measurement tool and evidence based care standards would be the important indicators to monitor whether necessary nursing care is implemented and be the useful primary resources to improve quality of nursing care services.

A study on the Economic Impact of Measurement Standards on the Advancement of Korean Industry - with case study on measuring equipment industry - (측정표준의 국내 산업성장에 대한 기여도 분석 - 측정기기산업의 분석을 중심으로 -)

  • Ahn, Ung-Hwan;Park, Byoung-Sun;Cho, Youn-Sang
    • Journal of Korea Technology Innovation Society
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    • v.10 no.2
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    • pp.361-382
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    • 2007
  • As the Korea's economy grows bigger and its industrial structure advances, demands of high quality product become increasing. And the technology becomes to be more important factor than labor power and capital. And, the development of technology plays the key role in promoting the competitiveness of a nation. Measurement means 'Measuring with instrument', dissemination of measurement standards related with dissemination and distribution of measuring instrument. Measurement technology has been known to be the main factor of economic growth and technological development. National measurement standards is one of these factors of measurement technology. Therefore, in order to enhance dissemination of measurement standards to industry, we have to define its economic impact. We analysed the economic impact of measurement standards in terms of its contribution to the product induction of industry and management results using I-O Table with the quantitative data. The results from this study show that the increasement of measurement standards dissemination is in complementary relation with the productivity of various industries, assembly manufacturing, in particularly.

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Development of Line Standards Measurement System Using an Optical Microscope (광학 현미경을 이용한 선표준물 측정 시스템 개발)

  • Kim, Jong-Ahn;Kim, Jae-Wan;Kang, Chu-Shik;Eom, Tae-Bong
    • Journal of the Korean Society for Precision Engineering
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    • v.26 no.8
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    • pp.72-78
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    • 2009
  • We developed a line standards measurement system using an optical microscope and measured two kinds of line standards. It consists of three main parts: an optical microscope module including a CCD camera, a stage system with a linear encoder, and a measurement program for a microscopic image processing. The magnification of microscope part was calibrated using one-dimensional gratings and the angular motion of stage was measured to estimate the Abbe error. The threshold level in line width measurement was determined by comparing with certified values of a line width reference specimen, and its validity was proved through the measurement of another line width specimen. The expanded uncertainty (k=2) was about 100 nm in the measurements of $1{\mu}m{\sim}10{\mu}m$ line width. In the comparison results of line spacing measurement, two kinds of values were coincide within the expanded uncertainty, which were obtained by the one-dimensional measuring machine in KRISS and the line standards measurement system. The expanded uncertainty (k=2) in the line spacing measurement was estimated as $\sqrt{(0.098{\mu}m)^2+(1.8{\times}10^{-4}{\times}L)^2}$. Therefore, it will be applied effectively to the calibration of line standards, such as line width and line spacing, with the expanded uncertainty of several hundreds nanometer.

RF and Microwave Power Standards from 10 MHz to 40 GHz over Decades

  • Kang, Tae-Weon;Kwon, Jae-Yong;Park, Jeong-Il;Kang, No-Weon
    • Journal of electromagnetic engineering and science
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    • v.18 no.2
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    • pp.88-93
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    • 2018
  • Radio frequency (RF) and microwave power is one of the key quantities in the framework of electromagnetic measurement standards. Therefore, the stability of the power standard is essential to users' reliable measurements in various areas. Coaxial and waveguide thermistor mounts are used as transfer standards of RF and microwave power. Over decades, the effective efficiencies of thermistor mounts have been measured using coaxial and waveguide microcalorimeters in the frequency range of 10 MHz-40 GHz. The measurement uncertainty of the effective efficiency is evaluated. Results show that the power standards have been well maintained within the measurement uncertainty.

An Analysis of Economic Effects on the Investment of Measurement Standards by Cost Function (비용함수에 의한 측정표준투자의 경제적 효과 분석)

  • 남경희;이병민;김동진
    • Journal of Korea Technology Innovation Society
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    • v.4 no.2
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    • pp.172-181
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    • 2001
  • This is a paper to understand the economic effects of the measurement standards by translog cost function. The data, as of the end of 1998, are from a survey of 514 firms in Korean industry. The analysis is compared to that of 1992 data analysis to check the trend. There are a little differences on the estimated coefficients, but there is no basic difference on trend of economic effects. The Investment on measurement standards have been contributed positively on the major managerial indicators such as productivity, profit, and so on.

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Measurement of Grating Pitch Standards using Optical Diffractometry and Uncertainty Analysis (광 회절계를 이용한 격자 피치 표준 시편의 측정 및 불확도 해석)

  • Kim Jong-Ahn;Kim Jae-Wan;Park Byong-Chon;Kang Chu-Shik;Eom Tae-Bong
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.8 s.185
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    • pp.72-79
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    • 2006
  • We measured grating pitch standards using optical diffractometry and analyzed measurement uncertainty. Grating pitch standards have been used widely as a magnification standard for a scanning electron microscope (SEM) and a scanning probe microscope (SPM). Thus, to establish the meter-traceability in nano-metrology using SPM and SEM, it is important to certify grating pitch standards accurately. The optical diffractometer consists of two laser sources, argon ion laser (488 nm) and He-Cd laser (325 nm), optics to make an incident beam, a precision rotary table and a quadrant photo-diode to detect the position of diffraction beam. The precision rotary table incorporates a calibrated angle encoder, enabling the precise and accurate measurement of diffraction angle. Applying the measured diffraction angle to the grating equation, the mean pitch of grating specimen can be obtained very accurately. The pitch and orthogonality of two-dimensional grating pitch standards were measured, and the measurement uncertainty was analyzed according to the Guide to the Expression of Uncertainty in Measurement. The expanded uncertainties (k = 2) in pitch measurement were less than 0.015 nm and 0.03 nm for the specimen with the nominal pitch of 300 nm and 1000 nm. In the case of orthogonality measurement, the expanded uncertainties were less than $0.006^{\circ}$. In the pitch measurement, the main uncertainty source was the variation of measured pitch values according to the diffraction order. The measurement results show that the optical diffractometry can be used as an effective calibration tool for grating pitch standards.

Fabrication and statistical characterization of Nb SQUID sensors for multichannel SQUID system

  • Kim, B.K.;Yu, K.K.;Kim, J.M.;Kwon, H.;Lee, S.K.;Lee, Y.H.
    • Progress in Superconductivity and Cryogenics
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    • v.22 no.4
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    • pp.62-66
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    • 2020
  • We fabricated superconducting quantum interference devices (SQUIDs) based on Nb Josephson junctions, and characterized the key parameters of the SQUIDs. The SQUIDs are double relaxation oscillation SQUIDs (DROSs) having larger flux-to-voltage transfer coefficient than the standard DC-SQUIDs. SQUID sensors were fabricated by using Nb junction technology consisted of a DC magnetron sputtering and a conventional photolithography process. In multichannel SQUID systems for whole-head magnetoencephalography measurement with a helmet-type SQUID array, we need about 336 SQUID sensors for each system. In this paper, we fabricated a few hundred SQUID sensors, measured the critical current, flux modulation voltage and decided if each tested SQUID can be used for the multichannel systems. As the criterion for the acceptance of the sensors, we chose the critical current and amplitude of the modulation voltage to be 8 ㎂ and 80 ㎶, respectively. The average critical current of the SQUIDs was 10.58 ㎂. The typical flux noise of the SQUIDs with input coil shorted was 2 μΦ0/√Hz at white region.

Ideal Topographic Simulations for Null Measurement Data

  • Su, Yan-Jen;Tung, Chi-Hong;Chang, Leh-Rong;Chen, Jin-Liang;Chang, Calvin
    • International Journal of Precision Engineering and Manufacturing
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    • v.9 no.4
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    • pp.79-82
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    • 2008
  • A method is described for ideally reconstructing the profile from a surface profiling measurement containing a reasonable amount of null measurement data. The proposed method can conjecture lost information and rectify irregular data that result due to bad measuring environments, signal transmission noise, or instrument-induced errors, The method adopts the concept of computer graphics and consists of several processing steps. First, a search for valid data in the neighborhood of the null data is performed. The valid data are then grouped and their contours are extracted. By analyzing these contours, a bounding box can be obtained and the general distribution of the entire area encompassing the valid and null data is determined Finally, an ideal surface model is overlaid onto the measurement results based on the bounding box, generating a complete reconstruction of the calculations, A surface-profiling task on a liquid crystal display photo spacer is used to verify the proposed method. The results are compared to those obtained through the use of a scanning electron microscope to demonstrate the accuracy of the proposed method.