Papers and Patents

Refereed Papers

  1. PDF preprint : Joshua W. Shehan, John M. C. Covington III, Varun S. Kshatri, Thomas P. Weldon, Ryan S. Adams, ``Permeability and Permittivity Extraction Issues For Non-Foster and Active Metamaterials,'' to appear in 2013 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio Science Meeting , Orlando, FL, July 7-13, 2013.

  2. PDF preprint : Joshua W. Shehan, Ryan S. Adams, Thomas P. Weldon, ``A Coaxial Test Fixture for Transmission/Reflection Measurements of Metamaterials,'' to appear in 2013 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio Science Meeting , Orlando, FL, July 7-13, 2013.

  3. PDF preprint : Varun S. Kshatri, John M. C. Covington III, Joshua W. Shehan, Thomas P. Weldon, Ryan S. Adams, ``Comparison of CMOS Current Conveyor Circuits for Non-Foster Applications,''  IEEE SoutheastCon 2013 Proceedings , pp. 1-4, Jacksonville, FL, April 4-7, 2013.

  4. PDF preprint : Varun S. Kshatri, John M. C. Covington III, Joshua W. Shehan, Thomas P. Weldon, Ryan S. Adams, ``A DC-Coupled Negative Inductance Circuit with Integrated Bias,''  IEEE SoutheastCon 2013 Proceedings , pp. 1-4, Jacksonville, FL, April 4-7, 2013.

  5. PDF preprint : Varun S. Kshatri, John M. C. Covington III, Joshua W. Shehan, Thomas P. Weldon, Ryan S. Adams, ``Capacitance and Bandwidth Tradeoffs in a Cross-Coupled CMOS Negative Capacitor,''  IEEE SoutheastCon 2013 Proceedings , pp. 1-4, Jacksonville, FL, April 4-7, 2013.

  6. PDF preprint : Konrad Miehle, Thomas P. Weldon, Ryan S. Adams, and Kasra Daneshvar, ``Wideband Negative Permeability Metamaterial with Non-Foster Compensation of Parasitic Capacitance,'' 2012 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio Science Meeting , Chicago, IL, July 8-14, 2012.

  7. PDF preprint : Thomas P. Weldon, Konrad Miehle, Ryan S. Adams, and Kasra Daneshvar, ``A Wideband Microwave Double-Negative Metamaterial with Non-Foster Loading,'' IEEE SoutheastCon 2012 Proceedings , pp. 1-4, Orlando, FL, March 15-18, 2012.

  8. PDF preprint : Thomas P. Weldon, Konrad Miehle, Ryan S. Adams, and Kasra Daneshvar, ``Simulation, Measurement, and Parameter Extraction for a 5.8 GHz Negative Permittivity Metamaterial,'' IEEE SoutheastCon 2012 Proceedings , pp. 1-4, Orlando, FL, March 15-18, 2012.

  9. PDF preprint : Thomas P. Weldon, Ryan S. Adams, and Kasra Daneshvar, ``Gaussian Models for Observed Dispersion in High Redshift Gamma Ray Bursts,'' IEEE SoutheastCon 2012 Proceedings , pp. 1-4, Orlando, FL, March 15-18, 2012.

  10. PDF preprint : Raghu K. Mulagada, Yi Yang, Thomas P. Weldon, and Don T. Lieu, ``Single Chip Spectrum Sensing Module in CMOS with Digital Frequency Synthesizer and Digital Output,'' IEEE SoutheastCon 2012 Proceedings , pp. 1-4, Orlando, FL, March 15-18, 2012.

  11. Don Lieu and Thomas P. Weldon, ``A 10MHz Continuous Time Bandpass Delta Sigma Modulator,'' IEEE SoutheastCon 2012 Proceedings , pp. 1-4, Orlando, FL, March 15-18, 2012.

  12. PDF preprint : Thomas P. Weldon, Ryan S. Adams, Kasra Daneshvar, and Raghu K. Mulagada, ``Metamaterials, Gamma-Ray Bursts, Quantum Gravity, and the Search for the Missing Half of the Maxwell Equations,'' 2011 IEEE International Microwave Symposium (IMS 2011) , Baltimore, MD, June 2011. http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5972735

  13. PDF preprint : T. P. Weldon, R. S. Adams, and R. K. Mulagada, ``A novel unit cell and analysis for epsilon negative metamaterial,'' IEEE SoutheastCon 2011 Proceedings , pp. 211-214, Nashville, TN, March 2011.

  14. PDF preprint : T. P. Weldon, R. S. Adams, K. Daneshvar, and R. K. Mulagada, ``Prospective gamma-ray propagation models and comparisons to metamaterial models,'' IEEE SoutheastCon 2011 Proceedings , pp. 207-210, Nashville, TN, March 2011.

  15. PDF preprint : D.T. Lieu and T. P. Weldon, ``Simulation of Simple Delta-Sigma Modulator for Driving Class C RF Amplifiers,'' IEEE SoutheastCon 2011 Proceedings , pp. 228-231, Nashville, TN, March 2011.

  16. See abstract : Shahab Chitchian, Thomas P. Weldon, Michael A. Fiddy, and Nathaniel M. Fried, ``Combined image processing algorithms for improved optical coherence tomography of prostate nerves,'' Journal of Biomedical Optics , vol. 15, no. 4, pp. 046014-1 - 046014-6, July/August 2010 .

  17. PDF preprint : Thomas P. Weldon, Ryan S. Adams, Kasra Daneshvar, and Raghu K. Mulagada, ``Left-Handed Extensions of Maxwell's Equations for Metamaterials,'' IEEE SoutheastCon 2010 Proceedings , pp. 489-492, Charlotte, NC, March 18-21, 2010.

  18. PDF preprint : Raghu Mulagada and Thomas P. Weldon, ``A Delay Line Discriminator for IFM Using a Left-Handed Delay Line,'' IEEE SoutheastCon 2010 Proceedings , pp. 185-188, Charlotte, NC, March 18-21, 2010.

  19. PDF preprint : Payam Shoghi, Christopher J. Barnwell, Raghu Mulagada, and Thomas P. Weldon, ``A Prototype Single-Chip Spectrum Analyzer with Integrated Frequency-Synthesized Tuning,'' IEEE SoutheastCon 2010 Proceedings , pp. 45-48, Charlotte, NC, March 18-21, 2010.

  20. Shahab Chitchian, Thomas P. Weldon, and Nathaniel M. Fried, ``OCT image segmentation for differentiation of the cavernous nerves from the prostate gland,'' Proceedings of SPIE , Vol. 7443, pp.74431D1-74431D4, August 2009.

  21. See abstract : Shahab Chitchian, Thomas P. Weldon, and Nathaniel M. Fried, ``Segmentation of Optical Coherence Tomography Images for Differentiation of the Cavernous Nerves from the Prostate Gland,'' Journal of Biomedical Optics , vol. 14, no. 4, pp. 044033-1 - 044033-4, July/August 2009 .

  22. PDF preprint : T. P. Weldon, ``Rayleigh and Mie Enhancement of Blackbody Radiation in Nanoscale Devices,'' IEEE SoutheastCon 2009 Proceedings pp. 216-220,, Atlanta, GA, March 2009.

  23. PDF preprint : P. Shoghi, C.J. Barnwell, T. P. Weldon, ``Experimental Results for a Successive Detection Log Video Amplifier in a Single- Chip Frequency Synthesized Radio Frequency Spectrum Analyzer,'' IEEE SoutheastCon 2009 Proceedings , Atlanta, GA, pp. 379-382, March 2009.

  24. PDF preprint : T. P. Weldon, Geng Ye, Raghu K. Mulagada ``Linearization Conditions for Two and Four Stage Circuit Topologies Including Third Order Nonlinearities,'' IEEE SoutheastCon 2009 Proceedings , Atlanta, GA, pp. 362-366, March 2009.

  25. PDF preprint : P. Shoghi, C.J. Barnwell, T. P. Weldon, ``Experimental Results for an Inductively Matched Microwave Amplifier in a Standard 0.5 Micron CMOS Process Using Four Identical Spiral Inductors,'' IEEE SoutheastCon 2008 Proceedings , Huntsville, AL, April 2008.

  26. PDF preprint : T. P. Weldon, ``Removal of Image Segmentation Boundary Errors Using an N-ary Morphological Operator,'' IEEE SoutheastCon 2007 Proceedings , pp. 509-513, Richmond, VA, March 2007.

  27. PDF preprint : D. T. Lieu and T. P. Weldon, ``Reduced Current Class AB Radio Receiver Stage Using Novel Superlinear Transistors with Parallel NMOS and PMOS Transistors at One GHz,'' IEEE SoutheastCon 2007 Proceedings , pp.49-53, Richmond, VA, March 2007.

  28. PDF abstract preprint : C. Mack, V. Mogallapu, A. Willis, and T. Weldon, ``Exploiting Typical Clinical Imaging Constraints for 3D Outer Bone Surface Segmentation,'' IEEE SoutheastCon 2007 Proceedings , pp. 519-523, Richmond, VA, March 2007.

  29. PDF preprint : T. P. Weldon, ``Improved Image Segmentation with a Modified Bayesian Classifier,'' 2006 IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2006) , pp. II-697-700, Toulouse, FR, May 2006.

  30. PDF preprint : T. P. Weldon, D. T. Lieu, and M. J. Davis, ``Experimental Results at One GHz on Linearizing an NMOS Transistor with a Parallel PMOS Transistor,'' 2005 IEEE Radio Frequency IC Symposium (RFIC 2005) , Long Beach, CA, June 2005.

  31. PDF preprint : T. P. Weldon and K. Miehle, ``Using Amplifiers with Poor Linearity to Linearize Amplifiers with Good Linearity,'' 2003 IEEE MTT-S International Microwave Symposium (IMS 2003) , Philadelphia, PA, vol.3, pp.1741-44, June 2003.

  32. PDF preprint : T. P. Weldon, Yuriy A. Gryazin, and Michael V. Klibanov, ``Novel Inverse Methods in Land Mine Imaging,'' 2001 IEEE Int. Conf. on Acoustics Speech and Signal Processing (ICASSP 2001) , Salt Lake City, UT, 7-11 May, 2001. Presentation.

  33. Abstract of paper. : Joseph M. Reinhardt, Andrien J. Wang, Thomas P. Weldon, and W. E. Higgins, ``Cue-Based Segmentation of 4D Cardiac Image Sequences,'' Computer Vision and Image Understanding , Vol. 77, No. 2, pp. 251-262 , Feb. 2000.

  34. PDF preprint : Thomas P. Weldon, Yuriy A. Gryazin, and Michael V. Klibanov, ``Comparison of 2D and 1D Approaches to Forward Problem in Mine Detection,'' SPIE Proceedings , Vol. 4038 , pp. 1140-1148 , April 2000.

  35. PDF preprint : T. P. Weldon and W. E. Higgins, ``Designing Multiple Gabor Filters for Multi-Texture Image Segmentation,''
    Optical Engineering , Vol. 38 No. 9 , pp. 1478-1489 , Sept. 1999.

  36. PDF preprint : T. P. Weldon and W. E. Higgins, ``An Algorithm for Designing Multiple Gabor Filters for Segmenting Multi-Textured Images,'' 1998 IEEE Int. Conf. on Image Processing (ICIP98) , Chicago, IL, 4-7 Oct. 1998.

  37. : D. F. Dunn, T. P. Weldon, and W. E. Higgins, ``Extracting Halftones from Printed Documents Using Texture Analysis,'' Optical Engineering , Vol. 36 No. 4, pp. 1044-1052, April 1997.

  38. PDF preprint : T. P. Weldon, W. E. Higgins, and D. F. Dunn, ``Efficient Gabor Filter Design for Texture Segmentation,'' Pattern Recognition , Vol. 29, No. 12, pp. 2005-2015, Dec. 1996.

  39. PDF preprint : T. P. Weldon, W. E. Higgins, and D. F. Dunn, ``Gabor Filter Design for Multiple Texture Segmentation,'' Optical Engineering , Vol. 35 No. 10, pp. 2852-2863, October 1996.

  40. PDF preprint : T. P. Weldon and W. E. Higgins, ``Integrated Approach to Texture Segmentation Using Multiple Gabor Filters,'' 1996 IEEE Int. Conf. on Image Processing (ICIP96) , Lausanne, Switzerland, vol. III, pp. 955-958, 16-19 Sept. 1996.

  41. PDF preprint : D. F. Dunn, T. P. Weldon, and W. E. Higgins, : `` Extracting Halftones from Printed Documents Using Texture Analysis,''
    1996 IEEE Int. Conf. on Image Processing (ICIP96) , Lausanne, Switzerland, vol. II, pp. 225-228, 16-19 Sept. 1996.

  42. PDF preprint : T. P. Weldon and W. E. Higgins, ``Design of Multiple Gabor Filters for Texture Segmentation,'' 1996 IEEE Int. Conf. Acous., Speech, Sig. Proc. (ICASSP96) , Atlanta, GA, vol. IV, pp. 2245-2248, 7 May 1996.

  43. PDF preprint : T. P. Weldon and W. E. Higgins, ``Multiscale Rician Approach to Gabor Filter Design for Texture Segmentation,'' 1994 IEEE Int. Conf. on Image Processing Austin, TX, vol II, pp. 620-624, 13-16 November, 1994.

  44. PDF preprint : T. P. Weldon, W. E. Higgins, and D. F. Dunn, ``Efficient Gabor Filter Design Using Rician Output Statistics,'' 1994 IEEE Int. Symp. Circuits, Systems, London, England, vol. 3, pp. 25-28, 30 May - 2 June, 1994.

  45. T. Weldon, ``An Inductorless Double Scroll Chaotic Circuit,'' American Journal of Physics, October 1990.

Patents
  1. Thomas P. Weldon, Ryan S. Adams, Konrad Miehle, US patent pending 13/766,249,
    ``Wideband Negative-Permittivity Metamaterials and Negative-Permeability Metamaterials Utilizing Non-Foster Elements,''
    Feb. 13, 2013.

  2. D. Binkley, R. Makki, T. Weldon, A. Chehab, US patent 7,710,140,
    ``Methods and apparatus for testing electronic circuits,''
    May 4, 2010. US 7,710,140 patent cover sheet.

  3. D. Binkley, R. Makki, T. Weldon, A. Chehab, US patent 7,148,717,
    ``Methods and apparatus for testing electronic circuits,''
    Dec. 12, 2006, US 7,148,717 patent cover sheet.

  4. T. P. Weldon , US patent 6,943,628,
    `` Methods and apparatus for substantially reducing nonlinear distortion,''
    Sept. 13, 2005, US 6,943,628 patent cover sheet .

  5. T. P. Weldon , US patent 6,906,585,
    ``Method and Apparatus for for cancellation of third order intermodulation distortion and other nonlinearities,''
    June 14, 2005, US 6,906,585 patent cover sheet .

  6. T. P. Weldon , US patent 6,853,247,
    ``Methods and apparatus for using Taylor series expansion concepts to substantially reduce nonlinear distortion,''
    Feb. 8, 2005, US 6,853,247 patent cover sheet .

  7. T. P. Weldon , US patent 6,853,248,
    ``Methods and apparatus for substantially reducing nonlinear distortion using multiple nonlinear devices,''
    Feb. 8, 2005, US 6,853,248 patent cover sheet.

  8. T. P. Weldon , US patent 6,794,938,
    ``Method and Apparatus for for cancellation of third order intermodulation distortion and other nonlinearities,''
    Sept. 21, 2004, US 6,794,938 patent cover sheet.

  9. D. Binkley, R. Makki, T. Weldon, A. Chehab, US patent 6,833,724,
    ``Methods and apparatus for testing electronic circuits,''
    Dec. 21, 2004, US 6,833,724 patent cover sheet.

Refereed Presentations & Abstracts

  • PDF preprint : Shahab Chitchian, Thomas P. Weldon, and Nathaniel M. Fried, ``2-D Segmentation OF OCT Prostate Images,'' 24th Engineering and Urology Society (EUS) Annual Meeting, Chicago, IL, p. 23, April 25, 2009.

    • Other papers

  • A detailed Gabor filter paper : T. P. Weldon, July, 2002, unpublished paper on the simultaneous design of a classifier and Gabor filter-bank for texture segmentation.

  • T. Weldon, ``High Sensitivity Wideband Millimeter Wave Receiver,'' U.S. Air Force Technical Report AFWAL-TR-87-1145, Wright Patterson AFB, February, 1988.

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