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Author: nathanael heckert

Displaying records 21 to 30 of 34 records.
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21. A Design-of-Experiments Plug-In for Estimating Uncertainties in Finite Element Simulations
Published: 5/18/2009
Authors: Jeffrey T Fong, Roland deWit, Pedro Vincente Marcal, James J Filliben, Nathanael A Heckert
Abstract: The objective of this paper is to introduce an economical and user-friendly technique for estimating a specific type of finite element simulation uncertainties, or, "error bars," for a class of mathematical models, of which no closed-form o ...

22. Through-focus Scanning and Scatterfield Optical Methods for Advanced Overlay Target Analysis
Published: 9/1/2008
Authors: Ravikiran (Ravikiran) Attota, Michael T. Stocker, Richard M Silver, Nathanael A Heckert, Hui H. Zhou, Richard J Kasica, Lei Chen, Ronald G Dixson, Ndubuisi George Orji, Bryan M Barnes, Peter Lipscomb
Abstract: In this paper we present overlay measurement techniques that use small overlay targets for advanced semiconductor applications. We employ two different optical methods to measure overlay using modified conventional optical microscope platforms. They ...

23. A Web-Based Data Analysis Methodology for Estimating Reliability of Weld Flaw Detection, Location, and Sizing
Published: 7/27/2008
Authors: Jeffrey T Fong, Owen F Hedden, James J Filliben, Nathanael A Heckert
Abstract: Recent advances in computer technology, intemet communication networks, and fmite element modeling and analysis capability have made it feasible for engineers to accelerate the feedback loop between the field inspectors of a structure or component fo ...

24. Robust Engineering Design for Failure Prevention
Published: 7/27/2008
Authors: Jeffrey T Fong, James J Filliben, Nathanael A Heckert, Roland deWit, Barry Bernstein
Abstract: To advance the state of the art of engineering design, we introduce a new concept on the "robustness" of a structure by measuring its ability to sustain a sudden loss of a part without causing an immediate collapse.  The concept is bas ...

25. Uncertainty Estimate of Charpy Data Using a 5-factor 8-run Design of Experiments
Published: 7/27/2008
Authors: Charles G. Interrante, Jeffrey T Fong, James J Filliben, Nathanael A Heckert
Abstract: Scatter in laboratory data with duplicates on Charpy impact tests is analyzed by identifying several sources of variability such as temperature, manganese sulfide, initial strain, mis-orientation, and notch radius in order to estimate the predictive ...

26. Design of Experiments Approach to Verification and Uncertainty Estimation of Simulations based on Finite Element Method
Published: 6/11/2008
Authors: Jeffrey T Fong, James J Filliben, Nathanael A Heckert, Roland deWit
Abstract: A fundamental mathematical modeling and computational tool in engineering and applied sciences is the finite element method (FEM).  The formulation of every such problem begins with the building of a mathematical model with carefully chosen simp ...

27. Relationship between dispersion metric and properties of PMMA/SWNT nanocomposites
Published: 6/13/2007
Authors: Takashi Kashiwagi, Jeffrey A Fagan, Jack F Douglas, Kazuya Yamamoto, Nathanael A Heckert, Stefan D Leigh, Jan Obrzut, Fangming Du, Minfang Mu, Sheng Lin-Gibson, K Winey, R Haggenmueller
Abstract: Particle spatial dispersion is a crucial characteristic of polymer composite materials and this property is recognized as especially important innanocomposite materials due to the general tendency of nanoparticles to aggregate under processing condit ...

28. NIST/SEMATECH e-Handbook of Statistical Methods; Chapter 1: Exploratory Data Analysis
Published: 6/1/2003
Authors: Nathanael A Heckert, James J Filliben
Abstract: This chapter presents an approach/philosophy for data analysis which employs a variety of techniques (mostly graphical) to: maximize insight into a data set; uncover underlying structure; detect outliers and anomalies; test underlying assumptions; an ...

29. Handbook 151: NIST/SEMATECH e-Handbook of Statistical Methods
Series: NIST Interagency/Internal Report (NISTIR)
Published: 11/1/2002
Authors: Nathanael A Heckert, James J Filliben, C M. Croarkin, B Hembree, William F Guthrie, P Tobias, J Prinz
Abstract: The URL is This is a web based guide to statistical methods for engineering. It involves case studies with interactive software for analysis.

30. Transformation, Ranking, and Clustering for Face Recognition Algorithm Comparison
Published: 3/1/2002
Authors: Stefan D Leigh, Nathanael A Heckert, Andrew L Rukhin, J Grother Phillips, Elaine M Newton, M Moody, K Kniskern, S Heath
Abstract: The performance of face recognition algorithms is recently of increased interest, although to date empirical analyses of algorithms have been limited to rank-based scores such a cumulative match score and receiver operating characteristic. This pap ...

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