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Charles R Hagwood (Fed)

Charles Hagwood received his B.S. degree in mathematics from A&T State University, Greensboro, NC. Afterwards, he attended the University of Michigan, graduating in 1979 with a Ph.D. in mathematics, writing a thesis entitled "Discrete Nonlinear Renewal Theory", under Michael Woodroofe. Between 1979 and 1981, Hagwood was a John Wesley Young Research Instructor in the Mathematics Department at Dartmouth College. During 1981-1987, he was an assistant professor in the Mathematics Department at the University of Virginia. In 1984, he received a Ford Foundation Fellowship and spent one year at Stanford University, in the Statistics Department. He has worked at NIST since 1987, providing consulting in areas that include reliability, uncertainty, and stochastic processes.

Technical Areas of Research and Consulting:

  • Stochastic modeling and applied probability

o   Cell biology (segmentation, shape descriptors, nanopores)

o   Aerosol particles (differential mobility analyzer, Langevin equation)

o   Reliability (computer software, conformance tests, materials)

  • Mathematical statistics and applied statistic

o   Standard Reference Materials (certification, uncertainty research, calibration)

o   Consensus values

o   Errors in variables

Professional Activities and Societies and Standards Activities:

  • Institute of Mathematical Statistics, Member


  • Andrew R. Chi Prize Paper Award, 1991  
  • Ford Foundation Fellow, Stanford University, 1984-1985


Measurement of mass of aerosol particles

Kevin Coakley, Robert Hagwood, Kensei Ehara, Nobuhiko FUKUSHIMA, Kittichote WORACHOTEKAMJORN, Naoko TAJIMA, Hiromu SAKURAI
An aerosol particle mass analyzer (APM) which classifies aerosol particles according to their mass has been developed. Mass distributions of aerosol particles

Certification of Standard Reference Material® 955d, Toxic Elements and Metabolites in Frozen Human Blood

Lee L. Yu, Karen E. Murphy, Colleen E. Bryan Sallee, Thomas W. Vetter, Robert C. Hagwood, George C. Caceres, Stephen E. Long, J M. Jarrett, M A. Franklin, J Castro Georgi, D M. Jones, Robert Jones, Z Li, Y L. Sommer, D S. Tevis, K Wallon, C D. Ward, M Maras, S Erdahl, C Gilmer, M Wermers, H Woldeysus, K F. Mehigan, M Morrissette, Christopher D. Palmer, Patrick J. Parsons
Standard Reference Material (SRM) 955d is intended for use in validating analytical methods for measuring toxic elements and mercury species in human blood, and

Measurement of mass of aerosol particles

Kevin J. Coakley, Robert C. Hagwood, Kensei Ehara, Nobuhiko Fukushima, Kittichote Worachotekamjorn, Naoko Tajima, Hiromu Sakurai
An aerosol particle mass analyzer (APM) which classifies aerosol particles according to their mass has been developed. Mass distributions of aerosol particles


A line drawing describing the apparatus and method for dynamically controlling spectrum access

Apparatus and Method for Dynamically Controlling Spectrum Access

NIST Inventors
Timothy A. Hall, Anirudha Sahoo and Charles R Hagwood
Patent Description There is a need for government and industry to share spectrum due to limited frequency band. This invention provides for a dynamic spectrum access (DSA) in a tiered sharing system whose goal is to increase spectrum utilization. It is an apparatus (hardware + firmware) that
Created October 9, 2019, Updated June 15, 2021