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Author: chih-ming wang

Displaying records 11 to 20 of 65 records.
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11. 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

12. On interchangeability of two laboratories
Published: 6/18/2010
Authors: Chih-Ming Wang, Hariharan K. (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

13. 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

14. 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

15. 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

16. 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

17. 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

18. 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

19. Fiducial Intervals for the Magnitude of a Complex-Valued Quantity
Published: 12/19/2008
Authors: Chih-Ming Wang, Hariharan K. (Hariharan K.) Iyer
Abstract: This paper discusses a fiducial approach for constructing uncertainty intervals for the distance between k normal means and the origin. When k=2 this distance is equivalent to the magnitude of a complex-valued quantity. Uncertainty intervals for the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=890046

20. A robust algorithm for eye-diagram analysis
Published: 11/1/2008
Authors: Jeffrey A Jargon, Paul D Hale, Chih-Ming Wang
Abstract: We present a new method for analyzing eye diagrams that always provides a unique solution by making use of a robust, least-median-of-squares (LMS) location estimator. In contrast to commonly used histogram techniques, the LMS procedure is insensit ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32775



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