Takehiro Azuma

Last updated: Jun 6, 2019 at 09:49

Name Takehiro Azuma http://www2.yukawa.kyoto-u.ac.jp/~takehiro.azuma/index.html Setsunan University Faculty of Science and Engineering Associate Professor Master of Science(Kyoto University), Ph. D.(Kyoto University) 10516785 0000-0001-8658-9407

Academic & Professional Experience

Apr 2018
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Today
Associate Professor, Department of Civil and Environmental Engineering, Setsunan University, Faculty of Science and Engineering

Apr 2015
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Mar 2018
Associate Professor, Institute for Fundamental Sciences, Setsunan University

Apr 2010
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Mar 2015
Permanent Lecturer, Institute for Fundamental Sciences, Setsunan University

Apr 2008
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Mar 2010
Permanent Lecturer, Department of Mathematics and Physics, Setsunan University

Oct 2006
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Mar 2008
Visiting Fellowship, VisiTata Institute of Fundamental Research (TIFR, India)

Apr 2004
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Sep 2006
JSPS postdoctoral fellowship, High Energy Accelerator Research Organization (KEK, Tsukuba)

Apr 2002
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Mar 2004
JSPS predoctoral fellowship (DC2), Kyoto University

Education

Apr 2001
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Mar 2004
Department of Physics, Predoctoral course, Faculty of Science, Kyoto University

Apr 1999
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Mar 2001
Department of Physics, Master course, Faculty of Science, Kyoto University

Apr 1995
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Mar 1999
Faculty of Science, Kyoto University

Apr 1992
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Mar 1995
Todaiji Gakuen Highschool

Committee Memberships

Apr 2014
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Today
Japanese Society for Engineering Education  Member

Apr 2002
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Today
Soryushiron Group  Member

Jun 2001
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Today
Physical Society of Japan  Member

Awards & Honors

2008
Nominee of 2000 Outstanding Intellectuals of the 21st Century 5-7th edition, International Biographical Centre

2007
Nominee of Marquis Who's Who In The World 2008-2014 (25th-31st edition), Marquis Who's Who

Published Papers

Konstantinos N. Anagnostopoulos, Takehiro Azuma, Yuta Ito, Jun Nishimura, Stratos Kovalkov Papadoudis
Journal of High Energy Physics   02(151)    Feb 2018   [Refereed]
In recent years the complex Langevin method (CLM) has proven a powerful method in studying statistical systems which suffer from the sign problem. Here we show that it can also be applied to an important problem concerning why we live in four-dime...
Takehiro Azuma, Pallab Basu, Prasant Samantray
Journal of High Energy Physics   09(071)    Sep 2017   [Refereed]
In this paper, we study the finite-temperature matrix quantum mechanics with chemical potential term linear in the single trace of U(N) matrices, via Monte Carlo simulation. In the bosonic case, we exhibit the existence of the Gross-Witten-Wadia (...
Takehiro Azuma, Yuta Ito, Jun Nishimura, Asato Tsuchiya
Progress of Theoretical and Experimental Physics   8    Aug 2017   [Refereed]
The type IIB matrix model has been investigated as a possible nonperturbative formulation of superstring theory. In particular, it was found by Monte Carlo simulation of the Lorentzian version that the 9D rotational symmetry of the spatial matrice...
Takehiro Azuma, Takeshi Morita, Shingo Takeuchi
Physical Review Letters   113(091603)    Mar 2014   [Refereed]
It is expected that the Gregory-Laflamme (GL) instability in the black string in gravity is related to the Rayleigh-Plateau instability in fluid mechanics. Especially, the orders of the phase transitions associated with these instabilities depend ...
Konstantinos N. Anagnostopoulos, Takehiro Azuma, Jun Nishimura
Journal of High Energy Physics   (11)009    Jun 2013   [Refereed]
It has long been speculated that the spontaneous symmetry breaking (SSB) of SO(D) occurs in matrix models obtained by dimensionally reducing super Yang-Mills theory in D=6,10 dimensions. In particular, the D=10 case corresponds to the IIB matrix m...
Takehiro Azuma, Takeshi Morita, Shingo Takeuchi
Journal of High Energy Physics   (10)59    Jul 2012   [Refereed]
We study a one-dimensional large-N U(N) gauge theory on a circle as a toy model of higher dimensional Yang-Mills theories at finite temperature. To investigate the profile of the thermodynamical potential in this model, we evaluate a stochastic ti...
Konstantinos N. Anagnostopoulos, Takehiro Azuma, Jun Nishimura
Journal of High Energy Physics   (10)126    Aug 2011   [Refereed]
The matrix model formulation of superstring theory offers the possibility to understand the appearance of 4d space-time from 10d as a consequence of spontaneous breaking of the SO(10) symmetry. Monte Carlo studies of this issue is technically diff...
Konstantinos N. Anagnostopoulos, Takehiro Azuma, Jun Nishimura
Physical Review D   83(054504)    Sep 2010   [Refereed]
The sign problem is a notorious problem, which occurs in Monte Carlo simulations of a system with the partition function whose integrand is not real positive. The basic idea of the factorization method applied on such a system is to control some o...
Takehiro Azuma, Pallab Basu, Spenta R. Wadia
Physics Letters B   659(3) 676-682   Oct 2007   [Refereed]
In the study of the small ten-dimensional Schwarzschild blackhole, the blackhole to string transition is an important problem. In hep-th/0605041, a possible identification is made between the Gross-Witten-Wadia (GWW) type third-order large-N phase...
Takehiro Azuma, Subrata Bal, Jun Nishimura
Journal of High Energy Physics   (03) 035   Dec 2007   [Refereed]
We discuss the classical and quantum stability of general configurations representing many fuzzy spheres in dimensionally reduced Yang-Mills-Chern-Simons models with and without supersymmetry. By performing one-loop perturbative calculations aroun...
Konstantinos N. Anagnostopoulos, Takehiro Azuma, Keiichi Nagao, Jun Nishimura
Journal of High Energy Physics   (09) 046   Jun 2005   [Refereed]
We study a 4d supersymmetric matrix model with a cubic term, which incorporates fuzzy spheres as classical solutions, using Monte Carlo simulations and perturbative calculations. The fuzzy sphere in the supersymmetric model turns out to be always ...
Takehiro Azuma, Subrata Bal, Keiichi Nagao, Jun Nishimura
Journal of High Energy Physics   (09) 047   Jun 2005   [Refereed]
We study a matrix model with a cubic term, which incorporates both the fuzzy S^2*S^2 and the fuzzy S^2 as classical solutions. Both of the solutions decay into the vacuum of the pure Yang-Mills model (even in the large-N limit) when the coefficien...
Takehiro Azuma, Subrata Bal, Jun Nishimura
Physical Review D   (72) 066005   Apr 2005   [Refereed]
It has been known for some time that the dynamics of k coincident D-branes in string theory is described effectively by U(k) Yang-Mills theory at low energy. While these configurations appear as classical solutions in matrix models, it was not cle...
Takehiro Azuma, Keiichi Nagao, Jun Nishimura
Journal of High Energy Physics   (06) 081   Oct 2004   [Refereed]
We clarify some peculiar aspects of the perturbative expansion around a classical fuzzy-sphere solution in matrix models with a cubic term. While the effective action in the large-N limit is saturated at the one-loop level, we find that the one-...
Takehiro Azuma, Subrata Bal, Keiichi Nagao, Jun Nishimura
Journal of High Energy Physics   (07) 066   May 2004   [Refereed]
We perform nonperturbative studies of the dimensionally reduced 5d Yang-Mills-Chern-Simons model, in which a four-dimensional fuzzy manifold, fuzzy S'', is known to exist as a classical solution. Although the action is unbounded from below...
Takehiro Azuma, Subrata Bal, Keiichi Nagao, Jun Nishimura
Journal of High Energy Physics   (05) 061   May 2004   [Refereed]
Fuzzy CP^2'', which is a four-dimensional fuzzy manifold extension of the well-known fuzzy analogous to the fuzzy 2-sphere (S^2), appears as a classical solution in the dimensionally reduced 8d Yang-Mills model with a cubic term involving the st...
Takehiro Azuma, Subrata Bal, Keiichi Nagao, Jun Nishimura
Journal of High Energy Physics   (05) 005   Jan 2004   [Refereed]
Fuzzy spheres appear as classical solutions in a matrix model obtained via dimensional reduction of 3-dimensional Yang-Mills theory with the Chern-Simons term. Well-defined perturbative expansion around these solutions can be formulated even for f...
Takehiro Azuma, Maxime Bagnoud
Nuclear Physics B   (651) 71-86   Sep 2002   [Refereed]
We investigate here a supermatrix model with a mass term and a cubic interaction. It is based on the super Lie algebra osp(1|32,R), which could play a role in the construction of the eleven-dimensional M-theory. This model contains a massive versi...
Takehiro Azuma, Hikaru Kawai
Physics Letters B   538(3/4) 393-405   Apr 2002   [Refereed]
We present a formulation of a matrix model which manifestly possesses the general coordinate invariance when we identify the large matrices with differential operators. In order to build a matrix model which has the local Lorentz invariance, w...
Takehiro Azuma, Satoshi Iso, Hikaru Kawai and Yuhi Ohwashi
Nuclear Physics B   (610) 251-279   Feb 2001   [Refereed]
We investigate several matrix models based on super Lie algebras, osp(1|32,R), u(1|16,16) and gl(1|32,R). They are natural generalizations of IIB matrix model and were first proposed by Smolin. In particular, we study the supersymmetry structures ...
Takehiro Azuma, Hikaru Kawai
Progress of Theoretical Physics   106(2) 255-292   Jun 2001   [Refereed]
We analyze the operator product expansion T_{\mu \nu}(z) W[C] in N=4 4-dimensional Super-Yang-Mills (SYM) theory with U(N) gauge group, and clarify that the closed Wilson loop does not possess an anomalous dimension and that only the shape of the ...

Misc

Konstantinos N. Anagnostopoulos, Takehiro Azuma, Yuta Ito, Jun Nishimura, Stratos Kovalkov Papadoudis
to be published in PoS(CORFU2018)      Jun 2019
The type IIB matrix model is conjectured to be a nonperturbative definition of type IIB superstring theory. In this model, spacetime is a dynamical quantity and compactification of extra dimensions can be realized via spontaneous symmetry breaking...
Takehiro Azuma, Atsushi Higashiya, Osamu Kamishima, Toshimasa Kobayashi, Takeshi Nagashima, Kyoko Tomoeda
JSEE 2017 Proceedings   208-209   Aug 2017   [Refereed]
In order to broaden students' horizons in science and technology, Setsunan University has established a new subject "Scientific and Technological Literacy". The Institute for Fundamental Sciences, which is in charge of teaching basic mathematics a...
Shinichi Shimada, Takehiro Azuma, Toshimasa Kobayashi, Toshio Nakatsu, Yoshiaki Teramoto and Kyoko Tomoeda
JSEE 2016 Proceedings   372-373   Aug 2016   [Refereed]
Konstantinos N. Anagnostopoulos, Takehiro Azuma, Jun Nishimura
Proceedings of Science LATTICE   (307)    Sep 2015
The IIB matrix model has been proposed as a non-perturbative definition of superstring theory. In this work, we study the Euclidean version of this model in which extra dimensions can be dynamically compactified if a scenario of spontaneously brea...
Takehiro Azuma, Toshimasa Kobayashi, Toshio Nakatsu, Shinichi Shimada, Yoshiaki Teramoto and Kyoko Tomoeda
JSEE 2015 Proceedings   63 438-439   Aug 2015   [Refereed]
Mathematics is an essential prerequisite for the students of technology. Setsunan University started participating in EMaT from 2011. We report on the status quo of EMaT in Setsunan University.
Konstantinos N. Anagnostopoulos, Takehiro Azuma, Jun Nishimura
Proceedings of Science LATTICE   226    Nov 2012
The IKKT or IIB matrix model has been postulated to be a non perturbative definition of superstring theory. It has the attractive feature that spacetime is dynamically generated, which makes possible the scenario of dynamical compactification of e...
Konstantinos N. Anagnostopoulos, Takehiro Azuma, Jun Nishimura
Proceedings of Science LATTICE   181    Oct 2011
The sign problem is a notorious problem, which occurs in Monte Carlo simulations of a system with a partition function whose integrand is not positive. One way to simulate such a system is to use the factorization method where one enforces samplin...
Konstantinos N. Anagnostopoulos, Takehiro Azuma, Jun Nishimura
Proceedings of Science LATTICE   167    Oct 2010
The IIB matrix model proposes a mechanism for dynamically generating four dimensional space--time in string theory by spontaneous breaking of the ten dimensional rotational symmetry . Calculations using the Gaussian expansion meth...
Takehiro Azuma, Keiichi Nagao
Bulletin of Faculty of Education, Ibaraki University   (56) 91-102   2007
(English translation is submitted as arXiv:0803.3167)
Recently in the authors' country Japan, the unpopularity of natural science among children has been a serious problem. Especially, physics is unpopular because physics requires mathematics. One...
Takehiro Azuma
Butsuri   64 788   2009
Takehiro Azuma
hep-th/0401120      Jan 2004
The large-N reduced models have been proposed as the nonperturbative formulation of the superstring theory. One of the most promising candidates is the IIB matrix model. While there have been a lot of interesting discoveries of the IIB matrix mode...
Takehiro Azuma
hep-th/0103003      Mar 2001
This paper reports the investigation of a matrix model via super Lie algebra, following the proposal of L. Smolin. We consider the osp(1|32,R) nongauged matrix model and gl(1|32,R) gauged matrix model, especially paying attention to the supersymme...

Conference Activities & Talks

Konstantinos N. Anagnostopoulos, Takehiro Azuma, Yuta Ito, Jun Nishimura, Toshiyuki Okubo, Stratos Kovalkov Papadoudis
Mandelstam Institute Seminar   30 Apr 2019   Mandelstam Institute, Wits University
The type IIB matrix model has been proposed as a non-perturbative definition of superstring theory. In this work, we study the Euclidean version of this model in which extra　dimensions can be dynamically compactified　if a scenario of spontaneously...
Konstantinos N. Anagnostopoulos, Takehiro Azuma, Yuta Ito, Jun Nishimura, Toshiyuki Okubo, Stratos Kovalkov Papadoudis
74th annual meeting of the Physical Society of Japan   14 Mar 2019   The Physical Society of Japan
The type IIB matrix model has been proposed as a non-perturbative definition of superstring theory. In this work, we study the Euclidean version of this model in which extra　dimensions can be dynamically compactified　if a scenario of spontaneously...
Konstantinos N. Anagnostopoulos, Takehiro Azuma, Yuta Ito, Jun Nishimura, Toshiyuki Okubo, Stratos Kovalkov Papadoudis
The 1st R-CCS International Symposium   18 Feb 2019   RIKEN Center for Computational Science (R-CCS)
The type IIB matrix model has been proposed as a non-perturbative definition of superstring theory. In this work, we study the Euclidean version of this model in which extra　dimensions can be dynamically compactified　if a scenario of spontaneously...
Konstantinos N. Anagnostopoulos, Takehiro Azuma, Yuta Ito, Jun Nishimura, Stratos Kovalkov Papadoudis
String Theory Seminar at TIFR   21 Aug 2018   TIFR
It has been speculated that the spontaneous symmetry breakdown (SSB) of the SO(D) rotational symmetry occurs in the matrix models obtained by the dimensional reduction of the super Yang-Mills (SYM)theory in D=6,10 dimensions, with the indices cont...
Konstantinos N. Anagnostopoulos, Takehiro Azuma, Ito Yuta, Jun Nishimura, Toshiyuki Okubo, Stratos Kovalkov Papadoudis
Strings 2018   27 Jun 2018
It has been speculated that the spontaneous symmetry breakdown (SSB) of the SO(D) rotational symmetry occurs in the matrix models obtained by the dimensional reduction of the super Yang-Mills (SYM) theory in D=6,10 dimensions, with the indices con...
Takehiro Azuma, Pallab Basu, Prasant Samantray
73rd annual meeting of the Physical Society of Japan   22 Mar 2018   The Physical Society of Japan
In this paper, we study the finite-temperature matrix quantum mechanics with chemical potential term linear in the single trace of U(N) matrices, via Monte Carlo simulation. In the bosonic case, we exhibit the existence of the Gross-Witten-Wadia (...
Takehiro Azuma, Pallab Basu, Prasant Samantray
40th Shikoku Seminar   23 Dec 2017   Kagawa University
In this paper, we study the finite-temperature matrix quantum mechanics with chemical potential term linear in the single trace of U(N) matrices, via Monte Carlo simulation. In the bosonic case, we exhibit the existence of the Gross-Witten-Wadia (...
Konstantinos N. Anagnostopoulos, Takehiro Azuma, Yuta Ito, Jun Nishimura, Stratos Kovalkov Papadoudis
ICTS-TIFR Seminar   1 Jan 2018   ICTS-TIFR, India
In recent years the complex Langevin method (CLM) has proven a powerful method in studying statistical systems which suffer from the sign problem. Here we show that it can also be applied to an important problem concerning why we live in four-dime...
Konstantinos N. Anagnostopoulos、Takehiro Azuma、Yuta Ito、Jun Nishimura、Stratos Kovalkov Papadoudis
East Asia Joint Workshop on Fields and Strings 2017, KEK Theory workshop 2017   14 Nov 2017   High-energy accelerator research orgainzation
The IIB matrix model has been proposed as a nonperturbative definition of superstring theory. In this work, we study the Euclidean version of this model in which extra dimensions can be dynamically compactified if a scenario of spontaneous breakdo...
Takehiro Azuma, Atsushi Higashiya, Osamu Kamishima, Toshimasa Kobayashi, Takeshi Nagashima, Kyoko Tomoeda
65th JSEE annual conference   30 Aug 2017   Japanese Society for Engineering Education (JSEE)
In order to cultivate students' literacy in science, Setsunan University newly established a class "Scientific and Technological Literacy". The Institute for Fundamental Sciences, in charge of basic education of mathematics and physics, started of...
Konstantinos N. Anagnostopoulos, Takehiro Azuma, Yuta Ito, Jun Nishimura, Stratos Kovalkov Papadoudis
72nd annual meeting of the Physical Society of Japan   17 Mar 2017   The Physical Society of Japan
The IIB matrix model has been proposed as a nonperturbative definition of superstring theory. In this work, we study the Euclidean version of this model in which extra dimensions can be dynamically compactified if a scenario of spontaneous break...
Takehiro Azuma
From Strings to LHC IV   10 Mar 2017   Tata Institute of Fumdamental Reseach
Takehiro Azuma
TIFR String Theory Seminars   31 Dec 2015   Tata Institute of Fundamental Research
The IIB matrix model has been proposed as a nonperturbative definition of superstring theory. In this work, we study the Euclidean version of this model in which extra dimensions can be dynamically compactified if a scenario of the spontaneous bre...
Takehiro Azuma, Toshimasa Kobayashi, Toshio Nakatsu, Shinichi Shimada, Yoshiaki Teramoto, Kyoto Tomoeda
63rd JSEE annual conference   4 Sep 2015   Japanese　Society for Engineering Education (JSEE)
Mathematical ability is important for the students of Faculty of Engineering to study in the university. In Setsunan University, we participate in EMaT from 2011. In this talk, we report on the status quo of EMaT in Setsunan University.
Takehiro Azuma
JPS 70th Annual Meeting   24 Mar 2015   The Physical Society of Japan
The IIB matrix model has been proposed as a nonperturbative definition of superstring theory. In this work, we study the Euclidean version of this model in which extra dimensions can be dynamically compactified if a scenario of spontaneous break...
Takehiro Azuma
KEK Theory Workshop 2015   28 Jan 2015   High Energy Accelerator Research Organization
The IIB matrix model has been proposed as a nonperturbative definition of superstring theory. In this work, we study the Euclidean version of this model in which extra dimensions can be dynamically compactified if a scenario of spontaneous break...
Takehiro Azuma
KEK Theory Workshop 2013   19 Mar 2013   KEK Theory Center
Takehiro Azuma
String Theory Seminar   Aug 2012   Tata Institute of Fundamental Research (TIFR)
Takehiro Azuma
67th JPS spring meeting   Mar 2012   The Physical Society of Japan
Takehiro Azuma
String Theory Seminar   Dec 2011   Tata Institute of Fundamental Research (TIFR)
AZUMA Takehiro
YITP Workshop QFT 2011   Jul 2011
Subrata Bal
YITP Workshop Quantum Field Theories: Fundamental Problems and Applications 2003   Dec 2003
Takehiro Azuma
YITP Workshop "QFT 2001"   Jul 2001
Takehiro Azuma
47th YONUPA Summer School   Aug 2001
Takehiro Azuma
Physical Society of Japan (JPS) Meeting   Sep 2001
Takehiro Azuma
Physical Society of Japan (JPS) Meeting   Sep 2001
Takehiro Azuma
Physical Society of Japan (JPS) Meeting   Mar 2002
Takehiro Azuma
YITP Workshop Quantum Field Theory 2002   Jul 2002
Takehiro Azuma
48th YONUPA Summer School   Aug 2002
Takehiro Azuma
Physical Society of Japan (JPS) Meeting   Sep 2002
Takehiro Azuma
YITP Workshop Quantum Field Theories: Fundamental Problems and Applications 2002   Dec 2002
Takehiro Azuma
49th YONUPA Summer School   Aug 2003
Takehiro Azuma
Physical Society of Japan (JPS) Meeting   Sep 2003
Takehiro Azuma
Physical Society of Japan (JPS) Meeting   Mar 2004
Takehiro Azuma
YITP Workshop Quantum Field Theory 2004   Jul 2004
Takehiro Azuma
Physical Society of Japan (JPS) Meeting   Sep 2004
Takehiro Azuma
YITP Workshop Quantum Field Theories: Fundamental Problems and Applications 2004   Dec 2004
Takehiro Azuma
KEK Theory Workshop 2005   Mar 2005
Takehiro Azuma
Physical Society of Japan (JPS) Meeting   Mar 2005
Takehiro Azuma
YITP Workshop Quantum Field Theory 2005   Aug 2005
Takehiro Azuma
Physical Society of Japan (JPS) Meeting   Sep 2005
Takehiro Azuma
YITP Workshop Quantum Field Theories: Fundamental Problems and Applications 2005   Dec 2005
Takehiro Azuma
KEK Workshop Prospects of computational physics via supercomputer   Feb 2006
Takehiro Azuma
KEK Theory Workshop 2006   Mar 2006
Takehiro Azuma
Physical Society of Japan (JPS) Meeting   Mar 2006
Takehiro Azuma
YITP Workshop Quantum Field Theory 2006   Sep 2006
Takehiro Azuma
Physical Society of Japan (JPS) Meeting   Sep 2006
Takehiro Azuma
International Conference Indian String Meeting 2006   2006
Takehiro Azuma
HRI Workshop Indian String Meeting 2007   Oct 2007
Takehiro Azuma
International Conference From Strings to LHC II   Dec 2007   Tata Institute of Fundamental Research
Takehiro Azuma
YITP Workshop Quantum Field Theory 2008   Jul 2008
Takehiro Azuma
Physical Society of Japan (JPS) Meeting   Sep 2008
Takehiro Azuma
Physical Society of Japan (JPS) Meeting   Mar 2009
Takehiro Azuma
YITP Workshop Quantum Field Theory 2009   Jul 2009
Takehiro Azuma
Chubu Summer School 2009   Aug 2009
Takehiro Azuma
Physical Society of Japan (JPS) Meeting   Sep 2009
Takehiro Azuma
KEK Theory Workshop 2010   Mar 2010
Shingo Takeuchi
Physical Society of Japan (JPS) Meeting   Mar 2010
Konstantinos N. Anagnostopoulos
28th International Symposium on Lattice Field Theory (Lattice 2010)   Jun 2010
Takehiro Azuma
YITP Workshop Quantum Field Theory 2010   Jul 2010
Takehiro Azuma
Physical Society of Japan (JPS) Meeting   Sep 2010
Takehiro Azuma
Osaka Particle Theory Seminar   Jan 2011
Takehiro Azuma
Physical Society of Japan (JPS) Meeting (canceled due to Great East Japan Earthquake, but the presentation was deemed to be done)   Mar 2011

Research Grants & Projects

Japan Society for Promotion of Science: Grant-in-Aid for Scientific Research (C)
Project Year: Apr 2017 - Mar 2021    Investigator(s): Takehiro Azuma
Japan Society for the Promotion of Science: Grant-in-Aid for Young Scientists (B)
Project Year: Apr 2011 - Mar 2015    Investigator(s): Takehiro Azuma
Japan Society for the Promotion of Science: Grant-in-Aid for JSPS Postdoctoral Fellows
Project Year: Apr 2004 - Sep 2006    Investigator(s): Takehiro Azuma
Japan Society for the Promotion of Science: Grant-in-Aid for JSPS Predoctoral Fellows
Project Year: Apr 2002 - Mar 2004    Investigator(s): Takehiro Azuma

Others

Jan 1994
Winner of the First Round in "Japanese Olympiad in Informatics"