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Author: chih-ming wang

Displaying records 21 to 30 of 65 records.
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21. Charpy Machine Verification: Limits and Uncertainty
Series: Special Publication (NIST SP)
Published: 9/1/2008
Authors: Jolene D Splett, Christopher N McCowan, Chih-Ming Wang
Abstract: The purpose of this document is to clarify some issues pertaining to uncertainty statements and the ASTM E 23 limits used in the Charpy machine verification program. We explain some of the distributional subtleties associated with uncertainty and ult ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50573

22. Fiducial approach for assessing agreement between two instruments
Published: 7/9/2008
Authors: Chih-Ming Wang, Hariharan K. (Hariharan K.) Iyer
Abstract: This paper presents an approach for making inferences about the intercept and the slope of a linear regression model with both variables subject to measurement errors. The approach is based on the principle of fiducial inference. A procedure is prese ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150665

23. NIST Recommended Practice Guide: Computing Uncertainty for Charpy Impact Machine Test Results
Series: Special Publication (NIST SP)
Published: 9/1/2007
Authors: Jolene D Splett, Christopher N McCowan, Hariharan K. (Hariharan K.) Iyer, Chih-Ming Wang
Abstract: The purpose of this recommended practice guide is to demonstrate how to determine the uncertainty associated with mean absorbed energy of specimens tested on a Charpy impact machine. We assume that the Charpy machine has successfully met the requirem ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150515

24. Fiducial Approach to Uncertainty Assessment Accounting for Error due to Instrument Resolution
Published: 1/1/2007
Authors: Jan Hannig, Hariharan K. (Hariharan K.) Iyer, Chih-Ming Wang
Abstract: This paper presents an approach for making inference on the mean and variance of a Gaussian distribution in the presence of resolution errors. The approach is based on the principle of fiducial inference and requires a Monte Carlo method for computin ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150557

25. A Generalized Confidence Interval for a Measurand in the Presence of type-A and type-B Uncertainties
Published: 4/11/2006
Authors: Chih-Ming Wang, Hariharan K. (Hariharan K.) Iyer
Abstract: We consider the problem of estimating a measurand based on a sequence of measurements. Each measurement has both type-A and type-B errors. The measurements may have been obtained from a single experiment or several separate experiments. We investigat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150260

26. Uncertainty Analysis for Vector Measurands Using Fiducial Inference
Published: 1/1/2006
Authors: Chih-Ming Wang, Hariharan K. (Hariharan K.) Iyer
Abstract: This paper presents a method for constructing uncertainty regions for a vector measurand in the presence of both type-A and type-B errors. The method is based on the principle of fiducial inference and generally requires a Monte Carlo approach for co ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150367

27. Uncertainty in Reference Values for the Charpy V-notch Verification Program
Published: 5/1/2005
Authors: Jolene D Splett, Chih-Ming Wang
Abstract: We present a method for computing the combined standard uncertainty for reference values used in the Charpy machine verification program administered by the National Institute of Standards and Technology. The technique is compliant with the ISO GUM ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50807

28. Propagation of Uncertainties in Measurements Using Structural Inference
Published: 3/21/2005
Authors: Hariharan K. (Hariharan K.) Iyer, Chih-Ming Wang
Abstract: The ISO Guide to the Expression of Uncertainty in Measurement (GUM) recommends the use of a first-order Taylor series expansion for propagating errors and uncertainties. The GUM also permits the use of other analytical or numerical methods when the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150568

29. Detection of influential observation in the determination of the weighted-mean KCRV
Published: 1/1/2005
Authors: Chih-Ming Wang, Hariharan K. (Hariharan K.) Iyer
Abstract: Since the signing of the Mutual Recognition Arrangement, National Metrology Institutes (NMI) have carried out many key comparisons in a wide range of metrological areas to establish the equivalence of their measurement standards. The determination of ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=130043

30. On Higher Order Corrections for Propagating Uncertainties
Published: 1/1/2005
Authors: Chih-Ming Wang, Hariharan K. (Hariharan K.) Iyer
Abstract: The ISO Guide to the Expression of Uncertainty in Measurement (GUM) recommends the use of a first-order Taylor series expansion for propagating errors and uncertainties. The GUM also suggests the use of a second-order Taylor series approximation for ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150107



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