Toshio OHNISHI
Assistant Professor, Multidimensional Data Analysis Group, Department of Data Science

 

Phone:

+81-50-5533-8500

E-mail:

ohnishi

Date of Birth:

February, 1971

Education:

Bachelor of Science, Department of Science, University of Tokyo, 1993
Master of Science in Systems Management, Graduate School of Systems Management, University of Tsukuba, 2000

Degree:

Doctor of Philosophy in Statistical Science, The Graduate University for Advanced Studies, 2003, Title of doctoral thesis: Estimation of a high-dimensional parameter through a Pythagorean relationship.

Employment:

1995-2000, Employee, Sumitomo Marine and Fire Insurance Company, Limited
2002-2005, Assistant Professor, Department of Interdisciplinary Statistics, Institute of Statistical Mathematics
2005-present, Assistant Professor, Department of Data Science, Institute of Statistical Mathematics

Research
Fields:

Statistical Science

Research
Themes:

Simultaneous Estimation of a High-dimensional Mean Vector

Selected Papers
(1) Hasegawa, S., Nagai, Y., Oonishi, T., Ino, S. (1993): Hysteresis in phase transitions at clean and Au-covered Si (111) surfaces, Physical Review B, 47, 9903-9906.  
(2) Hasegawa, S., Nagai, Y., Oonishi, T., Kobayashi, N., Miyake, T., Murakami, S., Ishii, Y., Hanawa, D., Ino, S. (1995): Structural phase transitions at clean and metal-covered Si (111) surfaces investigated by RHEED spot analysis, Phase transitions, 53, 87-114.
(3) Suzuki, N., Oonishi, T., Hyodo, T., Chang, T. (2002): Study of silica aerogel grain surfaces by using a positron age-momentum correlation technique, Applied Physics A, 74, 791-795.
(4) Yanagimoto, T., Ohnishi, T. (2002): Simultaneous estimation of a mean vector based on mean conjugate priors, In Measurement and Multivariate Analysis (Eds. Nishisato, S, Baba, Y., Bozdogan, H., Kanefuji, K.), Springer-Verlag Tokyo, 191-196.
(5) Ohnishi, T., Yanagimoto, T. (2003): Electrostatic views of Stein-type estimation of location vectors, J. Japan Statist. Soc., 33, 39-64.
(6) Yanagimoto, T., Ohnishi, T. (2005): Extensions of the conjugate prior through the Kullback-Leibler separators, J. Multivariate Anal., 92, 116-133.
(7) Yanagimoto, T., Ohnishi, T. (2005): Standardized posterior mode for the flexible use of a conjugate prior, J. Statist. Plann. & Inference, 131, 253-269.
(8) Ye, X., Ohnishi, T. (2006): Empirical Bayes estimation in the von Mises distribution (in Japanese), Tokei-Suri, 54-1, 177-190.
(9) Ohnishi, T., Yanagimoto, T. (2007): Conjugate location-dispersion families, J. Japan Statist. Soc., 37, 307-325.

Technical Report:
(1) Ohnishi. T., Tsubaki, H. (2001): Minimization of the Fisher information matrix under a given covariance matrix function, ISM Research Memo., 819.
(2) Ohnishi, T., Yanagimoto, T. (2004): A Pythagorean relationship in the conjugate analysis (in Japanese), RIMS Kokyuroku, Kyoto University, 1380, 182-190.
(3) Ohnishi, T., Yanagimoto, T. (2005): Dual structure in the conjugate analysis of curved exponential families, RIMS Kokyuroku, Kyoto University, 1439, 202-220.

(4) Ohnishi, T. (2006): Estimating a common slope of multiple strata in the Tweedie distribution using a conjugate prior, RIMS Kokyuroku, Kyoto University, 1506, 167-176.

Membership of Academic Societies
Japan Statistical Society, Japanese Society of Applied Statistics

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