_______________________________________________________________________

Research Instructor, Dept. of Bioengineering, Univ. of Utah, and Computational Scientist, TechniScan, Inc.

* Ph.D. Mathematics , University of Utah, 1991

(Scientific Computation, Application of Differential Geometry to Wave Propagation and Systems Theory, Algebraic Topology, Lie Groups, Lie Algebras, and their applications to Mathematical Physics, Computational Modelling)

* M.Sc. Mathematics , Dalhousie University, Halifax, Nova Scotia, Canada

(Computational Applied Mathematics,.Functional Analysis, Differential Equations, Neurophysiology)

* B. Math. Pure and Applied Mathematics (Honours--double major) University of Waterloo, Waterloo, Ontario, Canada..

(Differential Geometry, Mathematical Physics, Relativity)

"Apparatus and method for imaging using inverse scattering techniques and Wave-field Energy", Inventors: Steven A. Johnson, James W. Wiskin, David T. Borup, F. Natterer, F. Weubbeling, USA Patent pending, 1997

"Wave Imaging Using Inverse Scattering Techniques", Inventors: Steven A. Johnson, James W. Wiskin, David T. Borup, Frank Stenger, D. A. Christensen, USA Patent 5,588,032, Dec. 24, 1996

1. Chris Dawn Correa -- M.Sc. in Dept. Chemical and Fuels Engineering, U. of Utah, expected: April, 1998

2. Jay Ostler -- M.Sc. in Mechanical Engineering, U. of Utah, expected: Fall 1998

3. Jesse Shelke -- Ph.D. in Mechanical Engineering, U. of Utah, expected Fall 1999

4. Shay Shoham -- Ph.D. in Bioengineering, U. of Utah, expected Fall 2001

PUBLICATIONS:

Wiskin, J. W., Borup, D. T., Johnson, S. A., "Inverse Scattering from cylinders of arbitrary cross-section in stratified environments via Green's operator", J. Acoust. Soc. America, 102 (2), Pt.1, August, 1997.

Yuan, X., D. Borup D. T., Wiskin, J. W., Berggren, M., Johnson, S. A. and R. Eidens, "Simulation of acoustic wave propagation in dispersive media with relaxation losses by using FDTD methods with PML absorbing boundary condition", accepted with revision, Trans. of Ultrasonics, Ferro., and Freq. Control.

Wiskin, J. W., Borup, D. T., Johnson, S. A., "Frequency Domain Inverse Scattering in stratified 3-D environments via Integral equation optimization", submitted for review, J. Acoust. Soc. America.

Yuan, X., D. Borup, Wiskin, J. W. , M. Berggren, Rick Eidens, S. A. Johnson, "Formulation and Validation of Berenger's PML Absorbing Boundary for the FDTD simulation of Acoustic Scattering", IEEE Trans. UFFC. 44, 4, 1997(IEEE Trans Ultrason., Ferro, Freq. Control.)

Steven A. Johnson, David T. Borup, James W. Wiskin, Michael J. Berggren, Michael S. Zhdanov, Kyle Bunch, and Richard Eidens, "Application of Inverse Scattering and Other Refraction Corrected methods to Environmental Imaging with Acoustic or Electromagnetic Energy", in Next Generation Environmental models and computational methods., Ed. George Delic, Mary F. Wheeler, Proceedings of a U.S. Environmental Protection Agency sponsored workshop at the National Environmental Supercomputing Center

Wiskin, J.W., D. T. Borup, and S. A. Johnson, "Inverse Scattering from cylinders of arbitrary cross-section in Stratified Environments", in Progress in Electromagnetics Research Symposium (PIERS), July 24-28, University of Washington, Seattle, WA, 1995, p.195.

Borup, D. T., S. A. Johnson, and J. W. Wiskin, FDTD and Integral Equation simulation of a Prototype Ultrasound Breast Scanner, in Progress in Electromagnetics Research Symposium, (PIERS) July 24-28, University of Washington, Seattle, WA, 1995, p. 621.

Eidens, R. S., Wiskin, J. W. , Borup, D. T., Johnson, S. A., Berggren, M. A., "Experimental Verification of Acoustic Inverse Scattering Tomography -- Simple Phantoms", submitted IEEE Trans. Ultrason., Ferro. and Freq. Cont.

Wiskin, J. W., S. A. Johnson, D. Borup, M. Berggren, and R. Eidens, "Full Inverse Scattering vs. Born-like Approximation for Imaging in a Stratified Ocean", Proc. of Engineering in harmony with the Ocean (Oceans '93), Victoria, British Columbia, Oct. 1993.

Johnson, S. A., D. T. Borup, M. J. Berggren, Wiskin, J. W., R. S. Eidens, 1993, "Comparison of Inverse Scattering and Other Tomographic Imaging Algorithms using simulated and Tank Data for Modelling Subbottom Imaging Systems," Proc. of Engineering in harmony with the Ocean (Oceans '93), Victoria, British Columbia, Oct. 1993.

Johnson, S. A., D. T. Borup, M J. Berggren, Wiskin, J. W., and R. S. Eidens, 1992, "Modelling of inverse scattering and other tomographic algorithms in conjunction with wide bandwidth acoustic transducer arrays for towed or autonomous sub-bottom imaging systems," Proc. of Mastering the Oceans through Technology (Oceans 92) , Newport. R.I. Oct. 26-29, 1992, pp 294-299.

Wiskin, J. W., "Geometric and Integral Equation Methods for Scattering in Layered Media". 1991, Ph.D. Dissert., Dept. Math., University Microfilms International, Ann Arbor, MI.

Seader, J.D., M. Kuno, W.J. Lin, Johnson, S. A. K. Unsworth and Wiskin, J., W., "Homotopy Continuation methods", Computers and Chemical Engineering..Vol. 14, No. 1, pp. 71-85, 1990 -- Winner Best Paper of 1990 Award.

Wiskin, J. W., S.A. Johnson, D.T. Borup and M.J. Berggren, 1989, "Non-pertubative Modeling and Inversion of Elastic and Acoustic inhomogeneous Structures Imbedded within a Layered Half Space," SEG 1989 Summer Workshop, Snowbird, UT, Aug. 13-17, 1989.

Johnson, S.A., D.T. Borup, Wiskin, J. W., R.S. Eidens and M.J. Berggren, , 1989, "Imaging Shear and Bulk Elastic parameters in Three-Dimensions by Fullwave, Non-Pertubative Inverse Scattering Tomography with Examples from Large Grids, Limited View Angles and Real Data," 18th Int. Symp. on Acoustic Imaging, Santa Barbara, CA, Sept. 18-20, 1989.

Borup D. , S. Johnson, Wiskin, J. W. and M. Berggren, 1989, "Integral equation algorithms for imaging arbitrarily inhomogeneous distributions of elastic parameters imbedded in a homogeneous space," SEG 1989 Summer Workshop, Snowbird, UT, Aug. 13-17, 1989.

Wiskin, J. W., 1980, "Modelling of Acetylcholine Release from Neurons and Parameter Estimation",Lect. in Applied Math, Vol. 19, American Math. Soc.

* Programming experience in Fortran, C, C++, MPI (Message Passing Interface) and PVMD3 - parallel programming protocols, Maple(TM), MATLAB, SPSS, MacroMedia Authorware for Presentations.

Visualization software: IBM Data Explorer

Languages: English, French

Worked with various operating systems: Unix, MacOS, Windows95

Dept. of Bioengineering, University of Utah, Research Instructor -1992 - present

Instructor Math 591 - Allied Course with Dept. Math/Dept. Bioeng. - Wave Propagation and Inversion Techniques.

Inverse Scattering (Electromagnetics and Acoustics), Scientific Computation, and algorithm development.

System administration on several Unix Workstations (HPUX), and helped to administer Web site for Center for Inverse Problems, and TechniScan, Inc.

Involved in application of Numerical methods, FDTD, Integral Equations, Parabolic methods and Differential Geometry, to Scientific Computation: Optimization, Inverse Scattering, System Theory and Computational Biology.

Developed high performance Integral equation method codes for solution of wave equation in layered media.

Modelled large scale acoustics, elastodynamics, electromagnetics, and diffusion problems with high performance Finite Difference codes.

Modelled large scale acoustics, elastodynamics, electromagnetics, and diffusion problems using high performance spectral marching method codes.

Parallelized several codes to run on IBM RS6000 workstation cluster, and SGI power challenge.

Helped to develop and run a research seminar on inverse problems for the 1993-94 academic year

Developed and taught a two-quarter graduate level course on modern methods in Constrained Nonlinear optimization for the 1994-95 academic year.

Developed and taught a one-quarter graduate level course on "Nonlinear systems in Bioengineering/Medicine"

Worked with Hyperthermia group in developing code to optimize treatment of cancer by Hyperthermia.

Carried out simulations of inversion for conductivity in 3-D, in real-time, using migration type algorithm.

Worked with Combustion group to apply constrained minimization methods to infinite dimensional control problem.

Center for Inverse Problems and Imaging Technology - Research Scientist-Ultrasonics

Investigation of wave propagation and associated inverse problems - 1991 - present.

Department of Bioengineering, University of Utah, Research Associate -

Occasional teaching responsibilities and Research tasks, Salt Lake City, Utah. 1989 - 1992

Department of Mathematics University of Utah, Adjunct Instructor-

Salt Lake City, Utah.: 1989 -1991

Advanced Imaging Methods Laboratory - Mathematician/Scientist,

Mathematical methods applied to Imaging problems 1987 - 91

Dept. of Physics, Univ. of Utah: Teaching Assistant

Physics 795 Differential Geometry for Physicists.(Unified Quantum Field Theory), 1986 - 87,

Dept. of Mathematics, University of Utah, Teaching Fellow - 1981-1987

(full classroom responsibilities - 300-level Differential Equations, 300-level Complex Variables, and Engineering Calculus) University of Utah.

Mathematics Department, Dalhousie University, Research Associate - Nova Scotia, Canada, 1978 - 80

Great Lakes Forest Research Center Student Director (Fiscal and Scientific)

Summer Dutch Elm Disease Survey Project, Great Lakes Forest Research Center, Sault Ste. Marie, Ontario, Canada, 1978

1. Coauthor of "Best Paper" in Comp. and Chem. Engng., 1990

2. Honourable mention for Link Energy Fellowship (among 13 finalists nationwide)

3. Financial Support for Rocky Mountain Math. Consortium Summer Course on Non-linear Systems and Complete Integrability - Dr. H. Flaschka, Lecturer

4. Graduate Research Fellow - Univ. of Utah,

5. Descartes Fellowship, University of Waterloo

Served as P.I. on 4 Grants and co-investigator on several grants, including:

Physics of Wave Modeling and Subbottom Imaging by Inverse Scattering

Source: US NAVY

Award Amount: $200,000.00

Period: 11/01/94 - 10/31/96

Scanner Validation for Inverse Scattering Breast Imaging

Source: National Istitute of Health

Award Amount $750,000.00

Period: 11/1/95 to 10/31/97

3-D Inversion Imaging of DNAPL by EM and Other Cone Penetrometer Tools

TechniScan, Inc.

Source of Support: US Air Force SBIR program

Award Amount: $1,000,000,.00

Period: 1/97 to 1/99

Laboratory Demonstation of Inverse Scattering GPR in the Laboratory Scale

Source: EG&G (DOE site at INEL)

Award Amount: $250,000.00

Period: Completed 1994

Detection of Buried Mines by Advanced Seismic Methods

Source of Support: US Navy Phase II SBIR

Award Amount: $750,000.00

Ended 09/14/96.

Theoretical and Experimental Studies of Full Vector, 3-D, Quantitative, Inverse Scattering, Ground Penetrating Radar

Source of Support: Air Force-AFOSR

Award Amount: $344,517.00

Period: 3/95 to 3/98

Dr. S. A. Johnson, Dept. Bioengineering, Univ. of Utah

Dr. Dilip Ghosh-Roy, Consultant for the Office of Naval Research

Dr. F. Stenger, Computer Science Department, Univ. of Utah.

Soc. Industrial and Applied Mathematicians, IEEE Engineering in Medicine and Biology, IEEE Antennas and Propagation, IEEE Freq. Control Society, Acoustical Society of America, American Mathematical Society 1989-1991.