• Title, Summary, Keyword: measurement

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A Study on the Universal Outer Diameter Measurement Module using LVDT (LVDT를 이용한 범용 외경측정 모듈에 관한 연구)

  • Lee, Neung-Gu;Kwac, Lee-Ku;Kim, Hong-Gun
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.16 no.3
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    • pp.100-106
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    • 2017
  • A universal outer diameter measurement module was developed using a linear variable differential transformer (LVDT). This outer diameter measurement module enables simultaneous measurement of outer diameter, displacement, and perpendicularity of bench-type high-precision products by combining analogue and digital measurement principles with mechanically precise and fine adjustment functions. The developed module showed a performance of 0.001mm in measurement resolution, 0.001mm in measurement accuracy, reference surface abrasion lower than Ra 0.1864, and measurement stability of 0.002mm. Therefore, we have acquired domestic measurement technology to improve productivity by securing technical competitiveness for universal diameter measurement technology, lower production costs through import substitution, and increased quality of products with more precise measurement technology. Furthermore, a substitution effect is expected for expensive import measurement system equipment used in production, research, and inspection sites in industries that produce precision processing products such as automobile and machine components.

The measurement temperature and analysis used embedded system by internet explorer (인터넷 익스플로러를 통한 임베디드 시스템 기반의 온도 측정 및 분석)

  • 김희식;김영일;설대연;남철
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.1003-1006
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    • 2004
  • In this paper have developed a system for monitoring and processing the real time sensor data in remote site through network. For realizing this system, measurement equipment and protocol are used to transmit the measurement data to remote server and to process measurement data. In server part, the received data from remote site sensor is converted to text or graphic charts for user. The measurement device in sensor part receives the sensor data form sensor and store the received data to its internal memory for transmitting data to server part through Internet. Also the measurement device can receive data form server. The temperature sensor is connected to the measurement device located in laboratory and the measurement device measures temperature of laboratory which can be confirmed by user through Internet. We have developed a server programworking on the Linux to store measurement data from measurement device to server memory. The program is use for SNMP(Simple Network Management Protocol) to exchange data with measurement device. Also the program changes the measurement data into text and graphic charts for user display. The program is use apache PHP program for user display and inquiry. The real time temperature measurement system can be apply for many parts of industry and living.

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Diagnostic Framework for Performance Measurement Practices of Public Broadcasting (공영방송 성과측정관행의 진단 틀)

  • Min, Jae-H.
    • Korean Management Science Review
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    • v.26 no.1
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    • pp.137-159
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    • 2009
  • An organizational performance measurement practice is a function of performance measurement system and performance management system they are currently employing, and its quality is determined by evaluating the followings in a comprehensive manner: first, if they are measuring right things; second, if they are measuring in a right way; third, if they are actively facilitating a process of data collection, structuring, analysis, interpretation, and dissemination; and fourth, if they are using performance measurement results for the primary purposes of performance measurement. This study proposes a diagnostic framework for evaluating the performance measurement practices of public broadcasting which include the qualities of performance measurement and performance management, and develop a structured questionnaire for that purpose. The framework proposed in this study does not serve only as a useful tool for public broadcasting to revise their respective performance measures and performance measurement systems, but it also make their respective performance measurement practices a strategic management tool as well as an operational management one.

Signal Measurement Algorithm for 3GPP WCDMA Measurement Equipment (3GPP WCDMA모뎀 계측장비를 위한 신호계측 알고리듬)

  • Hong, Dae-Ki
    • Journal of the Semiconductor & Display Technology
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    • v.10 no.1
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    • pp.7-15
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    • 2011
  • In this paper, we implement measurement functionality for the 3GPP (Third Generation Partnership Project) WCDMA (Wideband Code Division Multiple Access) modem. Generally speaking, the receiving algorithms in normal modems cannot be used directly to the measurement system due to the lack of the measurement accuracy. In this paper, we propose the new measurement algorithm for precise 3GPP WCDMA signal measurements. In the measurement algorithm, 4-stage parameters estimation scheme is used. To improve the measurement accuracy, we increase the number of the received signal samples by interpolation. The proposed 3GPP WCDMA signal measurement algorithm can be used for verifying and implementing SoC/FPGA modem measurement systems.

Stability Evaluation of In-Line Measurement System with Repeated Measurements (반복 측정이 가능한 인라인 측정시스템의 안정성 평가)

  • Joung, Sooho;Byun, Jai-Hyun
    • Journal of Korean Institute of Industrial Engineers
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    • v.30 no.1
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    • pp.36-43
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    • 2004
  • In-line measurement systems are preferred to those in analytical laboratories, since in-line systems provide rapid response to process upsets. If an in-line measurement system exhibits an unstable variation and if this instability in measurement variation goes undetected, it will make the process monitoring procedure invalid. This paper presents a stability evaluation procedure for the in-line measurement system using two independent readings from the in-line measurement system and one reading from the analytical laboratory, which requires less measurement cost and time.

Estimations of Measurement System Variability and PTR under Non-normal Measurement Error (비정규 측정오차의 경우 측정시스템 변동과 PTR 추정)

  • Chang, Mu-Seong;Kim, Sang-Boo
    • Journal of the Korean Society for Quality Management
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    • v.35 no.1
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    • pp.10-19
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    • 2007
  • ANOVA is widely, used for measurement system analysis. It assumes that the measurement error is normally distributed, which nay not be seen in some industrial cases. In this study the estimates of the measurement system variability and PTR (precision-to-tolerance ratio) are obtained by using weighted standard deviation for the case where the measurement error is non-normally distributed. The Standard Bootstrap method is used foy estimating confidence intervals of measurement system variability and PTR. The point and confidence interval estimates for the cases with normally distributed measurement error are compared to those with non-normally distributed measurement errors through computer simulation.

Measurement uncertainty in heavy-weight floor impact sounds (측정 불확도에 따른 중량충격음 측정편차에 관한 연구)

  • Yoo, Seung-Yup;Kim, Yong-Hee;Sim, Myoung-Hee;Jeon, Jin-Yong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.826-829
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    • 2008
  • In a field measurement, measurement errors are produced by measuring environments and systematic errors in the measurement procedure. Measurement errors can be expressed as a measurement uncertainty. In this study, the measurement uncertainty and various measuring factors are investigated in heavy-weight impact sounds. According to KS 2810-2, the model functions, which is the estimation of the maximum SPL measurement in each octave band frequency, are determined. From this estimation model, 3.53dB is shown in 63Hz. This level is caused by the sound field of the receiving room, which does not meet the diffusing field.

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A System for Measuring 3D Human Bodies Using the Multiple 2D Images (다중 2D 영상을 이용한 3D 인체 계측 시스템)

  • 김창우;최창석;김효숙;강인애;전준현
    • Journal of the Korean Society of Costume
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    • v.53 no.5
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    • pp.1-12
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    • 2003
  • This paper proposes a system for measuring the 3D human bodies using the multiple 2D images. The system establishes the multiple image input circumstance from the digital camera for image measurement. The algorithm considering perspective projection leads us to estimate the 3D human bodies from the multiple 2D images such as frontal. side and rear views. The results of the image measurement is compared those of the direct measurement and the 3D scanner for the total 40 items (12 heights, 15 widths and 13 depths). Three persons measure the 40 items using the three measurement methods. In comparison of the results obtained among the measurement methods and the persons, the results between the image measurement and the 3D scanner are very similar. However, the errors for the direct measurement are relatively larger than those between the image measurement and the 3D scanner. For example, the maximum errors between the image measurement and the 3D scanner are 0.41cm in height, 0.39cm in width and 0.95cm in depth. The errors are acceptable in body measurement. Performance of the image measurement is superior to the direct. because the algorithm estimates the 3D positions using the perspective projection. In above comparison, the image measurement is expected as a new method for measuring the 3D body, since it has the various advantages of the direct measurement and 3D scanner in performance for measurement as well as in the devices, cost, Portability and man power.

Accuracy Comparison of Blood Pressure among the Direct Measurement Method and Two Automatic Indirect Measurement Methods in the Patients with Various Blood Pressure (다양한 혈압상태에서 직접혈압을 기준으로 HP 자동혈압기와 국산자동혈압기의 정확도 비교)

  • Song Hyo-Sook;Jun Tae-Gook;Choi Eun-Jung;Kim Mi-Jung
    • Journal of Korean Academy of Fundamentals of Nursing
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    • v.8 no.3
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    • pp.366-378
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    • 2001
  • Objective: The purpose of this study was to identify differences in measurement methods for blood pressure (Direct measurement, HP automatic indirect measurement, and SE 7000 Korean made indirect measurement), and to evaluate the clinical trial of the Korean made automatic indirect blood pressure measurement. Material & Methods: From June, 1999 to February, 2000, fifty five consecutive patients were randomized into hypertension group (n=20), normotension group (n=20), and hypotension group (n= 15). Measuring blood pressure by indirect methods (HP NIBP M 1008B and SE 7000 NIBP Korean made) was done simultaneously in the same arm with arterial line for direct blood pressure measurement (HP M1006A). The procedures were repeated ten times at intervals of 2 minutes. Statistical analysis was Performed using SPSS (version 8.0 for windows) software package. Values were expressed as means and standard deviation and means were compared using t-test. Statistical significance was considered present with a p value less than 0.05. Results: In the hypertension group and noromotension group, the disparity between HP direct measurement and indirect SE 7000 NIBP did not show any differences compared to the disparity between HP direct measurement and indirect HP NIBP. In the hypotension group, the disparity in the diastolic pressure between HP direct measurement and indirect SE 7000 NIBP was significantly different compared to the disparity between HP direct measurement and indirect HP NIBP (p<0.001), however, disparities in systolic pressure did not showed any differences. Conclusion: Direct blood pressure measurement (HP M1006A) can be replaced with indirect blood pressure measurements (HP NIBP M 1008B & SE 7000 NIBP) in normotension and hypertension patients. Korean made indirect measurement was found to be more accurate compared to HP indirect measurement in hypotension Patients, but more study is needed.

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Accuracy Improvement of Digital Measurement System by Modified Piecewise Measuring Functions (개선 구산 계측함수에 의한 디지털 계측시스템의 정밀도 향상)

  • Hong, Sung-Hun;Kang, Moon-Sung
    • Journal of Institute of Control, Robotics and Systems
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    • v.7 no.2
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    • pp.138-145
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    • 2001
  • Measurement errors in a digital measurement systems are mainly due to the consisting elements accuracies and the circuit parameters changes following the environment variations such as temperature. Further, systems non-linearity makes the measurement accuracy worse, and accordingly a linearization method should be considered to avoid this worsening. In this study, a temperature error-correction method and linearization methods are proposed and a digital temperature measurement system utilizing these methods is realized. And the proposed measurement methods are observed to increase the measurement accuracy of the digital measurement system.

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