Mathematical Foundation of Computer Science Laboratory

/ Yasuhiko Ikebe / Professor
/ Maxim Yu. Ershov / Assistant Professor

Yasuhiko Ikebe, the lab head, continued his research in three totally different fronts:

• (a) numerical algorithm development based on his matrix method for special function computation,
• (b) global virtual university, and
• (c) English-Japanese hyper-dictionary construction.

1. Regular Research Fund from Fukushima-Ken in two categories............................ 3.3 million yen,
2. * Fukushima-Ken Academic Research Promotion Foundation Funding.................................1.5 million yen,
3. * Monbusho Kaken-Hi Basic Research(C).... 1.0 million yen,
4. * Monbusho Kaken-Hi International Academic Investigative Research............................... 4.0 million yen
5. * Gaku-Shin Database Compilation Funding..3.0 million yen TOTAL..................................12.8 million yen ("*" indicates those projects for which Ikebe acted as Principal Investigator)

He wishes to express his gratitude for the generous support as stated.

Yasuhiko Ikebe served as referees for leading journals in computer science and numerical analysis.

Maxim Ershov continued his study in numerical simulation of semiconductor devices until he left the University of Aizu in December, 1998, to move to Georgia State University, USA. He acquired his present position of assistant professor of physics and astronomy at GSU, after having been selected from some 200 applicants.

His prolific research activity is greately missed by the Laboratory.

His reserach was supported in part by Ministry of Post and Telecommunications (Electronic Communication Frontier Research and Development Grant, 4.0 million yen, principal investigator) and other grants. He is a member of the IEEE, the American Physical Society, and the Japan Society of Applied Physics.

Maxim Ershov serves as a reviewer in Applied Physics Letters, Journal of Applied Physics, Semiconductor Science and Technology, and other journals.

Refereed Journal Papers

1. Y. Miyazaki, A. Asai, D. S. Cai, Y. Ikebe., Inverse Eigenvalue Problems for Mathieu's Differential Equation. Trans. Japan Soc. for Industrial and Applied Math. No.8, pp.199-222, June, 1998.

2. M. Ershov, S. Satou, Y. Ikebe., Transient Photoresponse of Quantum Well Infrared Photodetectors: I. Analytical Model. Submitted for publication. Journal of Applied Physics., At the time of writing it is to appear on the December, 1999.

3. A.G.U.Perera, V.G.Silvestrov, S.G.Matsik, H.C.Liu, M.Buchanan, Z.R.Wasilewski, and M.Ershov., Nonuniform vertical charge transport and relaxation in quantum well infrared photodetectors. J. Appl. Phys., 1998, vol.83, no.2, pp.991-997.

4. M. Ershov., Lateral photocurrent spreading in single quantum well infrared photodetectors. Appl. Phys. Lett., 1998, vol.72, no.22, pp.2865-2867.

5. M.Ershov, H.C.Liu, M.Buchanan, Z.R.Wasilewski, and A.K.Jonscher., Negative capacitance effect in semiconductor devices. IEEE Trans. on Electron Devices, 1998, vol.45, no.10, pp.2196-2206.

6. M. Ershov., Photoconductivity mechanism of quantum well infrared photodetectors under localized photoexcitation. Applied Physics Letters, 1998, vol.73, no.23, pp.3432-3434.

Refereed Proceeding Papers

1. Y. Ikebe, Y. Kikuchi, Y. Miyazaki, D. S. Cai., Infinite Matrices and Special Function Computations. Proc. of the 4th IMACS Symposium on Iterative Methods in Scientific Computation, October 18-20, 1998, Austin, Texas, USA, D. R. Kincaid and A. C. Elster (Editors), 291-296, in IMACS Series in Computational and Applied Mathematics, Volume 5, Department of Computer Science, Rutgers University 1999.

2. M.Ershov and A.N.Korotkov., Theory of noise in quantum well infrared photodetectors. Int. Workshop on Contemporary Photonics Technologies, 1998, Tokyo, Japan.

3. M.Ershov and A.N.Korotkov., Noise and photoconductivity in single quantum well infrared photodetectors. Int. Conf. Photonics West'98, 1998, San Jose, USA.

4. M. Ershov, Responsivity of quantum well infrared photodetectors under localized excitation. 11th Int. Conference on Superlattices, Microstructures, and Microdevices, July 1998, Hurghada, Egypt, Book of Abstracts.

5. M.Ershov, Coordinate dependence of transient and steady-state responsivity in quantum well infrared photodetectors. Proceedings of the 25th Int. Symp. on Compound Semiconductors, October 1998, Nara, Japan, Ed. by H.Sakaki, J.-C.Woo, N.Yokoyama, and Y.Hirayama, IOP Publishing, 1999, pp.117-122.

6. M.Ershov, Numerical simulation of noise in quantum well infrared photodetectors. Proc. of the 6-th International Workshop on Computational Electronics, October 1998, Osaka, Japan.

7. M.Ershov, Generation-recombination noise in multiple quantum well infrared photodetectors. Int. Conf. Photonics West'99, January 1999, San Jose, USA, Proceedings of SPIE, Photodetectors: Materials and Devices IV, Ed. by G.J.Brown and M.Razeghi, vol.3629, pp.121-128.

Others

1. Y. Ikebe, D, S. Cai, et. al. English-Japanese Hyper-Dictionary as a public domain software at http://hotaru1.is.tsukuba.ac.jp/hidic/hdhome.htm

2. Y. Ikebe, Principal Investigator. Report submitted to Fukushima-Ken Academic Research Promotion Foundation, "Global Virtual Univerity".

   At the time of writing, the joint project with Center for Digital Innovation(CDI), University of California at Los Angeles (UCLA), IMED-LA, Interactive Multimedia Education at a Distance-Linear Algebra), has been initiated. To put it simply, it is an initiative to create, produce, and integrate course materials based on Ikebe's lecture note on linear algebra to produce an integrated Internet course in linear algebra to be adressed to international market as well as to the domestic markets of Japan and of U.S.A. The course material is written in English. This is a fruit of the two-year investigations supported in part by the fundings identified as (2) and (4) in Lab Introduction.

3. In addition to those cited in the above, Professor Ikebe gave a number of invited talks and conference presentations at professional meetings and symposiums.