**Gennady A. Ryzhikov**

BACKGROUND

Theoretical Physics, University of St. Petersburg (SPbU), Russia

QUALIFICATION SUMMARY

MSin theoretical physics ("Calibration theories of relativistic extended objects")PhDin geophysics, more than 20 years of experience in R&D:

applied ill-posed and inverse problems, theory of regularization,

applied mathematics, data processing, parameter identification,

computerized tomography, optimization problems, etc., mainly in geophysics:

mathematical geophysics/algorithm development/novel approaches

to signal processing, multiple suppression, diffraction tomography

in seismics/optics, 3D depth seismic imaging, seismic monitoring,

geostatistics,etc.Author of a few novel approaches to data processing.Real datahave been processing with the approaches:satellite/airborne IR/UV radiation data; side-scanning sonar data,seismic data: VSP, 2D/3D, 3C, etc.; in particular:

:VSP- and 3D-data from Norsk Hydro

Biryulina, M. and Ryzhikov, G., 1997,Convex Body Regularization (CoBR) in Linear Inversion/Deconvolution,59th EAGE Annual Conference, Geneva, Switzerland, 1997,P122;

:3C crosswell-data from ConocoM.S. Biryulina, K.S. Osypov, G.A. Ryzhikov, J.A. Scales, 1996Seismic Inversion Using Energetic Envelopes,AGU 96 Fall Meeting, S72B-03;

regional (Italy, Germany, Norway) seismological network 3C-dataRyzhikov, G., Biryulina, M. and E. Husebye, 1996,A novel approach to automatic monitoring of regional seismic events,IRIS Newsletter,v.15, pp. 12-14;

:2D-data from Norsk HydroG.A.Ryzhikov and M.S. Biryulina , 1998,Sharp Deconvolution in Elimination of Multiples:68th Ann. Internat. Mtg. Soc. Expl. Geophys.,Expanded Abstracts, ST-18.3, pp. 1983-1986.Biryulina, Marina and Ryzhikov, Gennady, 1999,MSvE- A novel approach to statistical estimation of primariessuperimposed on incoherent multiples: (ps.gz: 110Kb)61st Mtg. Eur. Assoc. Expl Geophys.,Extended Abstracts, 99, Session: 1-10Ryzhikov, Gennady and Biryulina, Marina, 1999,Removal of intrabed multiples via Source-Signature Invariant Inversion,69th Ann. Internat. Mtg. Soc. Expl. Geophys.,Expanded Abstracts, Vol. II, SPRO 1.8, pp. 1076-1079 (PDF: 575 Kb) (ps.gz: 430 Kb)Biryulina, Marina and Ryzhikov, Gennady, 2000,Imaging of reflectors under uncertainties in macromodel(PDF: 250Kb)62nd Mtg. Eur. Assoc. Expl Geophys.,Extended Abstracts, 2000, Session: B-55Ryzhikov, Gennady and Biryulina, Marina, 2001,Can we hear seabed lithology from shipboard ? (PDF: 340 Kb) (ps.gz: 170Kb)in: VNIGRI / AAPG Regional International Conference, ,July 15-18, 2001, St. Petersburg, Russia,Extended Abstracts, Session:P4 -8

Ryzhikov, Gennady and Biryulina, Marina, 2004,Predicting large stochastic system evolution(COIF)

2008Retrieval of the physiological state of human skin from UV-Vis reflectance spectraJournal of Photochemistry and Photobiology B: Biology,93 (1), 2008, pp. 23-31

Changes in human skin after topical PDT with hexyl aminolevulinatePhotodiagnosis and Photodynamic Therapy,5 (3), 2008, pp. 176-181

2009Optical transfer diagnosis of pigmented lesions: a pilot studySkin Research and Technology,15, 2009, pp. 330-337

2010Optical Transfer Diagnosis of Pigmented LesionsDermatologic Surgery,36, 2010, pp. 1979-1986

2011Modeling of radiation transport in coupled atmosphere-snow-ice-ocean systemsJournal of Quantitative Spectroscopy & Radiative Transfer,112, 2011, pp. 714-726

Patents

W0 2009/117485 A3

Optical method for determining morphological parameters and physiological properties of tissue

W0 2009/094623 A3

Method for discriminating between malignant and benign tissue lesionsEMPLOYMENT

Senior Researcher at the University of Bergen, Norway :Since 1993

Senior research scientist, Institute of Physics, SPbU, Russia:Prior to 1993

ALGORITHM CREATION skills,e.g.Author of a new global optimization algorithm ( RGA-algorithm),

which has been successfully applied for 3D nonlinear inversion:

3D nonlinear inversion by entropy of image contrast optimization, 1995,

Nonlinear Processes in Geophysics, v.2, n.3/4, pp. 228-240

and for real data processing:

A new approach to coherency inversion by global optimization, 1995:

65th SEG Meeting, 1995, Expanded Abstracts, p.1081-1083.Author of a few novel algorithms for 3D prestack inversion/migration, e.g.

Moser, T., Biryulina, M. and G. Ryzhikov, 1997,

Born Inversion in Realistic Backgrounds by Means

of Recursive Green's Functions,

in: Inverse Problems of Wave Propagation and Diffraction,

G. Chavent and P.C. Sabatier, Eds.,

Lecture Notes in Physics, Vol. 486, Springer, pp.306-319Author (with V. Troyan) of a monograph (in Russian *):

Ryzhikov G.A. and V.N. Troyan,

Tomography and remote sensing inverse problems,

St.Petersburg Univ. Press, St. Petersburg, 1994, 220 pp.Author of novel METHODS/ALGORITHMS of regularization:

Realized as scientific software,

published mostly in technical reports:

Regularization in a Sobolev space of infinite order

'Convex Body Regularization' (CoBR:

constrains on values of a set of given linear functionals on

an estimated function)

Combined statistical/functional regularization

Self-adaptive regularization, etc.Author of novel METHODS/ALGORITHMS of machine learning/artificial intelligence

Realized as a nolinear binary classifier on labeled noisy data sets:

Patent W0 2009/117485 A3

LANGUAGERussian, English

OTHER PERTINENT INFORMATIONSupervision of PhD students, research assistants, research seminars,

lecturing, an ability to work with specialists in varied fields,

strong interest in interdisciplinary researches,

R&D-project initiation/leadership.

*Some topics from the book were published in English ,yet in "Mathematical Problems in the Theory of Wave Propagation",Part 26, 1997, Part 28, 1999, or in V.Troyan's lectures "Inverse seismic problems"

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