**Kwon, Song-Hwa**

Postdoctoral
Associate

259
Lind Hall

e-mail:shkwon at ima dot umn dot edu

Office: (612) 626-8996, Fax: (612) 626-7370

**Education**

Ph.D. in Mathematics,

Advisor: Professor Hyeong
In Choi.

M.A. in
Mathematics,

Advisor: Professor Hyeong
In Choi.

B.S. in
Mathematics,

**EMPLOYMENT**

l
Post Doctoral Associate, September
2005 – current

Institute for Mathematics and its

l
Post Doctoral Research Fellow,
March 2004 – August 2005

Statistical Research Center for

l
Part-time Instructor, March
2002 – August 2005

Department of

l
Teaching Assistant, March 1997
– February 2002

Department of

l
Senior Research Scientist (Part
time), August 2000 – August 2005

Amisys Corporation Research Laboratory

**Publication**

**Published/Accepted**

1. Two-dimensional
offsets and medial axis transform, Advances in Computational Mathematics, 2006,
accepted (with H.I.Choi, S.W.Choi,
C.Y.Han, T.W.Kim, H.P.Moon, K.H.Roh, N.S.Wee), pdf

2. Explicit nonflat time evolution for PDE-based image restoration,
Lecture Notes in Computer Science, Springer-Verlag,
2006, accepted (with S.Kim), pdf

3. Almost
rotation-minimizing rational parametrization of canal
surfaces, Computer Aided Geometric Design, Volume 21 (November 2004), Issue 8,
859—881 (with H.I.Choi & N.S.Wee),
pdf

4. Modified
Variable Multi-Sector Method for Iris Identification, Special session on
research at The Biometric Consortium Conference BC2004, Sep 20-22, 2004 (with H.I.Choi, D.H.Kim, S.J.Lee)

5. Clifford
algebra, Lorentzian geometry, and rational parametrization of canal surfaces, Computer Aided Geometric
Design, Volume 21 (April 2004), Issue 4, 327—339 (with H.C.Cho,
H.I.Choi, D.S.Lee, N.S.Wee), pdf

6. Clifford
Algebra, Pythagorean Hodograph, and Rational Parametrization
of Curves and Surfaces, February 2004 (Ph.D. Dissertation), pdf

7. Spread
spectrum watermarking scheme using PN sequence, Proceedings of the 2003
Workshop on Information Security for Multimedia Contents, p.44-49, May 2003
(with H.C.Cho, H.I.Choi, J.W.Jeon, H.P.Moon, S.H.Seo)

8. B-spline animation watermarking, Proceedings of the 2003
Workshop on Information Security for Multimedia Contents, p.91-95, May 2003
(with H.C.Cho, T.W.Kim, H.P.Moon, S.H.Seo), pdf

9. A New Digital
Watermarking Scheme for Rational Bezier Curves and Surfaces, Proceedings of the
2002 Workshop of Korea Information Processing Society, vol. 9, issue 1,
p.625-628, April 2002 (with H.I.Choi, T.W.Kim, H.P.Moon, N.S.Wee), pdf

**Submitted**

1. Topological
criterion for selection of quintic Pythagorean-hodograph
Hermite interpolants,
Computer Aided Geometric Design, 2006, submitted (with H.I.Choi,
R.T.Farouki, H.P.Moon), pdf

2. A Digital
Watermarking Scheme for Polygonal Meshes using Modified Spectral Decomposition,
ACM Symposium on Solid and Physical Modeling, 2005, submitted (with H.I.Choi, T.W.Kim, S.H.Park, H.J.Shin, J.K.Sohn), pdf

**Some
Visualization Softwares **

1. Planar Quintic Pythagorean-Hodograph Curves

2. Planar C2 Quintic Pythagorean-Hodograph
Splines