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1. Evaluation of Segmentation Algorithms on Cell Populations Using CDF Curves
Published: 2/24/2012
Author: Robert Charles Hagwood
Abstract: Cell segmentation is a critical step in the analysis pipeline for most imaging cytometry experiments and the segmentation algorithm can effect the quantitative data derived from image analysis. Methods to evaluate segmentation algorithms are importan ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907743

2. Significance Test in Operational ROC Analysis
Published: 4/5/2010
Authors: Jin Chu Wu, Alvin F Martin, Raghu N Kacker, Robert Charles Hagwood
Abstract: To evaluate the performance of fingerprint-image matching algorithms on large datasets, a receiver operating characteristic (ROC) curve is applied. From the operational perspective, the true accept rate (TAR) of the genuine scores at a specified fals ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903768

3. An Application of the Residue Calculus: The Distribution of the Sum of Non-Homogeneous Gamma Variates
Published: 2/2/2009
Author: Robert Charles Hagwood
Abstract: The probability density function for the sum of gamma variates with different shape parameters is found, using the inversion formula and the calculus of residues. This derivation seems more elegant than previous methods to derive the probability dens ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=51284

4. Uncertainty Analysis for Virtual Cement Measurement
Published: 9/13/2006
Authors: Blaza Toman, Adriana Hornikova, Robert Charles Hagwood, Hung-Kung Liu, Nien F Zhang, Edward Joseph Garboczi, Jeffrey W Bullard
Abstract: Virtual measurements are the outputs of well-defined mathematical models based on theoretical principles and simulation algorithms. The VCCTL (Virtual Cement and Concrete Testing Laboratory) is a software system built by the Material and Construction ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50888

5. Measurement of 100 nm and 60 nm Particle Standards by Differential Mobility Analysis
Series: Journal of Research (NIST JRES)
Published: 8/1/2006
Authors: George William Mulholland, Michelle K Donnelly, Robert Charles Hagwood, S R. Kukuck, Vincent A Hackley, D Y Pui
Abstract: The peak particle size and expanded uncertainties (95 % confidence interval) for two new particle calibration standards are measured as 101.60 nm ? 1.02 nm and 60.68 nm ? 0.59 nm. The particle samples are polystyrene spheres suspended in filtered ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=861358

6. Combining Data in Small Multiple Method Studies
Published: 5/1/2003
Authors: Robert Charles Hagwood, William F Guthrie
Abstract: In this article an accurate confidence interval is derived when the results of a small number of different experimental methods are combined for the determination of an unknown quantity. ANOVA and a simple hierarchical Bayesian analysis of variance ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50796

7. On the Asymptotic Distribution of Sums of Independent Nonidentically Distributed Pareto Variates
Published: 3/1/2002
Author: Robert Charles Hagwood
Abstract: The sum of independent Pareto random variables with varying parameters are shown to converge to a stable distribution. This extends a result of Blum for i.i.d. Pareto random variables.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=51085

8. Evaluation of the Elevated Temperature Creep Strength of Three Lead-Free Solder Alloys in Soldered Joints
Published: 7/1/2001
Authors: D A Shepherd, Robert Charles Hagwood, Richard Joel Fields
Abstract: Amendments to the Safe Drinking Water Act mandated that soldered joints used in potable water systems be free of lead. In addition to lead contents, allowable pressures used in potable water systems are directly related to the elevated temperature c ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852991

9. Reliability of Conformance Tests
Published: 8/21/1998
Authors: Robert Charles Hagwood, Raghu N Kacker, James H Yen, D L. Banks, Lynne S. Rosenthal, Leonard J Gallagher, Paul E Black
Abstract: A conformance test is a software assurance test that is applied in order to determine if specification requirements of the software are being met. It is a time-dependent model, where the software object is subjected to an a priori known test suite. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=151738

10. Software Testing: Protocol Comparison
Published: 5/29/1998
Authors: James H Yen, D L. Banks, Leonard J Gallagher, Paul E Black, Robert Charles Hagwood, Raghu N Kacker, Lynne S. Rosenthal
Abstract: Software testing is hard, expensive, and uncertain. Many protocols have been suggested, especially in the area of conformance verification. In order to compare the efficacy of these protocols, we have implemented a designed simulation experiment th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=151734