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You searched on: Author: craig shakarji

Displaying records 11 to 20 of 36 records.
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11. Theory and Algorithms for L1 Fitting Used for Planar Datum Establishment in Support of Tolerancing Standards
Published: 10/15/2013
Authors: Craig M Shakarji, Vijay Srinivasan
Abstract: We present the theory and algorithms for establishing a datum plane consistent with ASME Y14.5 standard definitions corresponding to a planar datum feature sampled with coordinate data that is weighted,. The method uses a one-sided minimization searc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913789

12. On the Enduring Appeal of Least-squares Fitting in Computational Coordinate Metrology
Published: 9/6/2013
Authors: Vijay Srinivasan, Craig M Shakarji, Edward P Morse
Abstract: The vast majority of points collected with coordinate measuring machines are not used in isolation; rather, collections of these points are associated with geometric features through fitting routines. In manufacturing applications, there are two fund ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907559

13. Theory and Algorithms for Weighted Total Least-Squares Fitting of Lines, Planes, and Parallel Planes to Support Tolerancing Standards
Published: 8/16/2013
Authors: Craig M Shakarji, Vijay Srinivasan
Abstract: We present the theory and algorithms for fitting a line, a plane, two parallel planes (corresponding to a slot or a slab) or many parallel planes in a total (orthogonal) least-squares sense to coordinate data that is weighted. Each of these problems ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912180

14. Metrological Challenges Introduced by New Tolerancing Standards
Published: 7/5/2013
Authors: Edward P Morse, Yue Peng, Vijay Srinivasan, Craig M Shakarji
Abstract: The recent release of ISO 14405-1 has provided designers with a richer set of specification tools for the size of part features, so that various functional requirements can be captured with greater fidelity. However, these tools also bring new challe ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916211

15. Fitting Weighted Total Least-Squares Planes and Parallel Planes to Support Tolerancing Standards
Published: 10/19/2012
Authors: Craig M Shakarji, Vijay Srinivasan
Abstract: We present elegant algorithms for fitting a plane, two parallel planes (corresponding to a slot or a slab) or many parallel planes in a total (orthogonal) least-squares sense to coordinate data that is weighted. Each of these problems is reduced to a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911379

16. Performing three dimensional measurements on micro-scale features using a flexible CMM fiber probe with ellipsoidal tip
Published: 1/5/2012
Authors: Balasubramanian Muralikrishnan, Jack A Stone Jr., Craig M Shakarji, John Richard Stoup
Abstract: The tip of a traditional CMM probe used for measurements of macro-scale artifacts is generally a sphere of excellent geometry. Its known diameter (from a prior calibration) and form along with the known approach direction (which is normal to the surf ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909420

17. Application Software
Published: 7/22/2011
Author: Craig M Shakarji
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906984

18. The NIST 66 m Ball Range A One Dimensional Artifact to test Three Dimensional Imaging Systems
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7725
Published: 11/3/2010
Authors: Bruce R. Borchardt, Craig M Shakarji
Abstract: NIST (the National Institute of Standards and Technology) has instituted a 66 m long range for testing of distance-measuring systems. The range consists of titanium balls mounted along a line on stands at unequal intervals. This paper describes thi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906846

19. Choosing test positions for laser tracker evaluation and future Standards development
Published: 7/15/2010
Authors: Balasubramanian Muralikrishnan, Daniel S Sawyer, Christopher J Blackburn, Steven David Phillips, Craig M Shakarji, Ed Morse, Robert Bridges
Abstract: A working group within the ISO TC 213 committee is developing a draft document [11] for evaluating the performance of laser trackers. The ASME B89.4.19 Standard [1] and the draft VDI/VDE 2617 part 10 [2] describe some useful tests that are incorporat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905959

20. RECIST vs. Volume Measurement in Medical CT Using Ellipsoids of Known Size
Published: 4/12/2010
Authors: Zachary H Levine, Bruce R. Borchardt, Nolan J Brandenburg, Charles W Clark, Balasubramanian Muralikrishnan, Craig M Shakarji, Joseph J. Chen, Eliot L. Siegel
Abstract: (a) Purpose: We wanted to test the extent to which two common methods of determining the sizes of tumors would perform when compared to a statistically significant number of well-characterized reference objects. The size of the objects was chosen to ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902647



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