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Search Publications by: Dennis D. Leber (Fed)

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Displaying 1 - 25 of 46

Certification of Standard Reference Material(R) 956e Electrolytes in Frozen Human Serum

April 2, 2025
Author(s)
Lee Yu, Steven Christopher, Regina Easley, Monique Johnson, Dennis Leber, Thomas Vetter, Jason Waters, Charles Barber, Karen Murphy, Laura Wood, Stephen Chin, Murli Narayan, Alexander Rhodes, Michael Nash
The National Institute of Standards and Technology (NIST) Standard Reference Material® (SRM®) 956e Electrolytes in Frozen Human Serum is intended for use in the calibration and validation of procedures and methods employed in clinical analysis for the

False Alarm Testing for Radiation Detection Systems

October 2, 2020
Author(s)
Dennis D. Leber, Leticia S. Pibida
An operator of a radiation detection system that displays a high rate of false alarms may be- come desensitized to these alarms. This action is known as alarm fatigue and can have detri- mental results as the operator may cease to respond to what may be

Comparing Instruments

September 30, 2020
Author(s)
James H. Yen, Dennis D. Leber, Leticia S. Pibida
This document details methods to compare instrument performance. Comparison methods for instruments outputting binary (0-1) responses as well as for instruments outputting continuous numeric responses are shown, first for two instruments and then for

Linking Theory to Practice: Predicting Ballistic Performance from Mechanical Properties of Aged Body Armor

August 24, 2020
Author(s)
Amanda L. Forster, Dennis D. Leber, Amy E. Engelbrecht-Wiggans, Virginie A. Landais, Allen Chang, Emilien J. Guigues, Guillaume Messin, Michael A. Riley
It has long been a goal of the body armor testing community to establish an individualized, scientific-based protocol for predicting end-of-life of fielded body armor ballistic performance. A major obstacle in achieving this goal is that the test methods

Confirming a Performance Threshold with a Binary Experimental Response

July 15, 2019
Author(s)
Dennis D. Leber, Leticia S. Pibida, Alexander L. Enders
Often, experimenters wish to confirm that a test artifact meets some predefined, fixed performance criterion or claim. For example: does the newly formulated pharmaceutical reduce the disease rate by 10 %; will the composite overwrapped pressure vessel

Uncertainty Quantification of Failure Probability and a Dynamic Risk Analysis of Decision Making for Maintenance of Ageing Infrastructure

January 2, 2019
Author(s)
Jeffrey T. Fong, James J. Filliben, Nathanael A. Heckert, Dennis D. Leber, Paul A. Berkman, Robert E. Chapman
Risk, as the product of failure probability and failure consequence, has been estimated and applied by engineers and managers to help make critical decisions on (a) maintenance of ageing plants, and (b) planning of new infrastructure. For ageing plants

Impact of Decision and Allocation Rules on Selection Decisions

June 2, 2015
Author(s)
Dennis D. Leber, Jeffery W. Herrmann
The quality of a selection decision is a function of the decision rule used and the data collected to support the decision. When physical measurements are the basis of the decision data, the measurement sampling scheme controls measurement uncertainty and

Sample Allocation for Multiple Attribute Selection Problems

December 10, 2014
Author(s)
Dennis D. Leber, Jeffery W. Herrmann
Prior to making a multiple attribute selection decision, a decision-maker may collect information to estimate the value of each attribute for each alternative. In this work, we consider a fixed experimental sample budget and address the problem of how best

Resource Allocation for Selection Decisions with Measurement Uncertainty

June 3, 2014
Author(s)
Dennis D. Leber, Jeffery W. Herrmann
Before selecting an alternative based on attribute values that have been determined through a measurement process that has error, a decision-maker can, in some cases, collect additional data to reduce uncertainty. Unlike previous work in the area of

Certification of Total Arsenic in Blood and Urine Standard Reference Materials by Radiochemical Neutron Activation Analysis and Inductively Coupled Plasma Mass Spectrometry

March 1, 2014
Author(s)
Rick L. Paul, William C. Davis, Karen E. Murphy, Colleen E. Bryan Sallee, Lee L. Yu, William F. Guthrie, Dennis D. Leber, Thomas W. Vetter
A newly developed procedure for determination of arsenic by radiochemical neutron activation analysis was used to measure arsenic in SRM 955c Toxic Elements in Caprine Blood and SRM 2668 Toxic Elements in Frozen Human Urine for the purpose of providing