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Search Publications by: Dennis D. Leber (Fed)

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Displaying 1 - 23 of 23

False Alarm Testing for Radiation Detection Systems

October 2, 2020
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
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
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
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
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
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
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
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
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

Characterization of Perchlorate in a New Frozen Human Urine Standard Reference Material

October 1, 2012
Lee L. Yu, William C. Davis, Rabia Oflaz, Gregory C. Turk, Jeff M. Jarrett, Liza Valentin, Benjamin C. Blount, Dennis D. Leber, Eric L. Kilpatrick
Perchlorate, an inorganic anion, has recently been recognized as an environmental contaminant by the U.S. Environmental Protection Agency (EPA). Assessment of human exposure to perchlorate requires measurement of the anion in urine. Although the

Incorporating Attribute Value Uncertainty into Decision Analysis

May 28, 2012
Dennis D. Leber, Jeffery W. Herrmann
Attribute value uncertainty is present in a decision when the consequences are characterized by uncertain estimates of the underlying, unknown true values. Attributes defined based upon measurement data, experimental data, or survey data are subject to

Objective Evaluation of Imager Performance

December 1, 2011
Francine K. Amon, Dennis D. Leber, Nicholas Paulter
We describe a method by which the evaluation and characterization of the performance of an imager can be done objectively and scientifically, that is, without routine operator interpretation. Although this method is demonstrated herein for passive long

Assessing the shelf-life of a prototype reference material for product emissions testing

May 2, 2011
Cynthia H. Reed, Daniel V. Samarov, Dennis D. Leber, Zhe Liu, John Little
The National Institute of Standards and Technology (NIST) and Virginia Tech (VT) are developing a volatile organic compound (VOC) reference material to validate product emissions chamber testing. To verify the storage method of the material and determine

Developing a Diffusive Reference Material for VOC Emissions Testing: Pilot Interlaboratory Study

February 25, 2011
Cynthia H. Reed, Zhe Liu, Jennifer Benning, Steven Cox, Daniel V. Samarov, Dennis D. Leber, Al Hodgson, Stephany Mason, Doyun Won, John C. Little
In order to improve the reliability of product emissions testing and labeling, the National Institute of Standards and Technology (NIST) and Virginia Tech (VT) have created a program to develop reference materials with independently known emission rates

Analysis of Three Different Regression Models to Estimate the Ballistic Performance of New and Environmentally Conditioned Body Armor

February 14, 2011
Diane Mauchant, Michael A. Riley, Kirk D. Rice, Amanda L. Forster, Dennis D. Leber, Daniel V. Samarov
The performance standard for ballistic-resistant body armor published by the National Institute of Justice (NIJ), NIJ Standard 0101.06, recommends estimating the perforation performance of body armor by performing a statistical analysis on V50 ballistic

A Collection of Homes to Represent the U.S. Housing Stock

August 1, 2008
Andrew K. Persily, Amy Musser, Dennis D. Leber
In order to allow nationwide analysis of ventilation and indoor air quality issues in residential buildings, a set of homes has been defined to represent the housing stock of the United States. This collection of dwellings is based on two residential

A Suite of Homes Representing the U.S. Housing Stock

December 1, 2003
Andrew K. Persily, Dennis D. Leber
In order to facilitate nationwide analysis of ventilation and indoor air quality issues in residential buildings, a set of homes has been defined to represent the housing stock of the United States. This so-called suite of homes is based on two residential