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Author: Robert Hagwood

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1. Movement on Stairs During Building Evacuations
Series: Technical Note (NIST TN)
Report Number: 1839
Published: 9/25/2014
Authors: Erica D Kuligowski, Richard D Peacock, Paul A Reneke, Emily A. Wiess, Jason D Averill, Robert Charles Hagwood, Enrico Ronchi, Bryan Hoskins, Michael Spearpoint
Abstract: The time that it takes an occupant population to reach safety when descending a stairwell during building evacuations is typically described by measureable engineering variables such as stairwell geometry, speed, density, and pre-evacuation delay ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914576

2. Testing Equality of Cell Populations Based on Shape and Geodesic Distance
Published: 12/3/2013
Authors: Robert Charles Hagwood, Javier Bernal, Michael W Halter, John T Elliott
Abstract: Image cytometry has emerged as a valuable in-vitro screening tool and advances in automated microscopy have made it possible to readily analyze large cellular populations of image data. A statistical procedure to study homogeneity of such data ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911573

3. Development of a Standard Reference Material for Metabolomics Research
Published: 11/4/2013
Authors: Karen W Phinney, Guillaume Ballihaut, Mary Bedner, Johanna Camara, Steven J Christopher, William C Davis, Nathan G. Dodder, Brian E Lang, Stephen E Long, Mark S Lowenthal, Elizabeth A. McGaw, Karen E Murphy, Bryant C Nelson, Jocelyn L. Prendergast, Jessica L Reiner, Catherine A Rimmer, Lane C Sander, Michele M Schantz, Katherine E Sharpless, Lorna Tregoning Sniegoski, Susan Shu Cheng Tai, Jeanice M Brown Thomas, Thomas W Vetter, Michael James Welch, Stephen A Wise, Laura J Wood, William F Guthrie, Robert Charles Hagwood, Stefan D Leigh, James H Yen, Nien F Zhang, Madhu Chaurhary-Webb, Huiping Chen, Bridgette Haynes, Donna J LaVoie, Leslie F McCoy, Shahzad S Momin, Neelima Paladugula, Elizabeth C Pendergrast, Christine M Pfeiffer, Carissa D Powers, Zia Fazili-Qari, Daniel Rabinowitz, Michael E Rybak, Rosemary L Schleicher, Mary Xu, Mindy Zhang, Arthur L Castle, Brandi S Benford, Gauthier Eppe
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912559

4. 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

5. Significance Test in Operational ROC Analysis
Published: 4/5/2010
Authors: Jin Chu Wu, Alvin 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

6. 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

7. 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

8. 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

9. 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

10. 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



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