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Author: chih-ming wang

Displaying records 11 to 20 of 67 records.
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11. On Non-Linear Estimation of a Measurand
Published: 11/7/2011
Authors: Chih-Ming Wang, Hariharan K Iyer
Abstract: We consider an estimation problem described in the Guide to the Expression of Uncertainty in Measurement (GUM). The problem is concerned with estimating a measurand that is a non-linear function of input quantities. The GUM describes two methods for ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908820

12. On Multiple-Method Studies
Published: 10/4/2010
Authors: Chih-Ming Wang, Hariharan K Iyer
Abstract: In this paper we review statistical models that describe measurements from a multiple-method study such as in the development of a reference material. We also review requirements for the so-called GUM compliance as this appears to be an important cri ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905972

13. Use of Electronic Calibration Units for Vector-Network-Analyzer Verification
Published: 7/30/2010
Authors: Dylan F Williams, Arkadiusz C. (Arkadiusz) Lewandowski, Denis X LeGolvan, Ronald A Ginley, Chih-Ming Wang, Jolene D Splett
Abstract: We present measurements indicating that electronic calibration units are stable enough to be used in place of mechanical vector-network-analyzer verification artifacts. This enables a new fully automated approach to verifying microwave vector-network ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903470

14. On interchangeability of two laboratories
Published: 6/18/2010
Authors: Chih-Ming Wang, Hariharan K Iyer
Abstract: This paper proposes a measure for assessing the degree of equivalence between the two laboratories in a key comparison. The measure is called asymmetric degree of interchangeability. It is asymmetric since, based on this measure, a laboratory may be ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904849

15. Identifying RF Identification Cards from Measurements of Resonance and Carrier Harmonics
Published: 5/27/2010
Authors: Henry Romero, Catherine A Remley, Dylan F Williams, Chih-Ming Wang, Timothy X. Brown
Abstract: We show that careful measurements of the unloaded resonant frequency and quality factor of radio frequency identification proximity cards allow identification of different card models and, for the set of cards we studied, identification with mini ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904644

16. Correcting sampling oscilloscope timebase errors with a passively mode-locked laser that is phase-locked to a microwave oscillator
Published: 4/1/2010
Authors: Jeffrey A Jargon, Paul D Hale, Chih-Ming Wang
Abstract: In this paper, we describe an apparatus for correcting the timebase errors when calibrating the response of an equivalent-time sampling oscilloscope using a passively mode-locked erbium doped fiber laser that is phase locked to a microwave signal gen ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900876

17. Uncertainty calculation for spectral-responsivity measurements
Published: 9/1/2009
Authors: John H Lehman, Chih-Ming Wang, Marla L Dowell, Joshua Aram Hadler
Abstract: This paper discusses a procedure for measuring the absolute spectral responsivity of optical-fiber power meters and computation of the calibration uncertainty. The procedure reconciles measurement results associated with a monochromator-based measure ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33185

18. Electromagnetic Measurements for Counterfeit Detection of Radio-Frequency Identification Cards
Published: 5/2/2009
Authors: Henry Romero, Catherine A Remley, Dylan F Williams, Chih-Ming Wang
Abstract: We investigate a technique for counterfeit detection of radio-frequency identification cards based on the electromagnetic characteristics of the cards rather than the digital information that they transmit. We describe a method of measuring the elect ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33134

19. Calculation of pulse parameters and propagation of uncertainty
Published: 3/1/2009
Authors: Paul D Hale, Chih-Ming Wang
Abstract: The fundamental starting point for the analysis of all two-state waveforms is the determination of the low- and highstate levels. This is a two-step process. First, the data are grouped into points belonging to each state, and second, the value of ea ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32782

20. Three Statistical Paradigms for The Assessment and Interpretation of Measurement Uncertainty
Published: 1/12/2009
Authors: William F Guthrie, Hung-Kung Liu, Andrew L Rukhin, Blaza Toman, Chih-Ming Wang, Nien F Zhang
Abstract: The goals of this chapter are to present different approaches to uncertainty assessment from a statistical point of view and to relate them to the methods that are currently being used in metrology or are being developed within the metrology communit ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=51273



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