On a property of $2$-dimensional integral Euclidean lattices,
8th Symposium on Algebra and Computation (AC2009),
Tokyo Metropolitan University, December 2, 2009.
On the zeros of polynomials
related to the extremal vertex operator algebras,
7th Japan-Korea Workshop on Algebra and Combinatorics, �彣���, 2259��,
2009ǯ8��27��.
Toy models for D. H. Lehmer's conjecture
(joint work with Eiichi Bannai),
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��¾ʬ��Ȥγغ�Ū��ή���ܻؤ��ơ�
(The 5th Mathematics Conference for Young Researchers)�ס�
�̳�ƻ��سؽѸ�ή���, March 4 (Wednesday).
Upper bound for l-modular lattices and its spherical designs,
��Kumjung Seminar in 2009 (satellite seminar of the 6th Korea-Japan Workshop on Algebra and Combinatorics.)��Room C32-208 at Pusan National University, February 11 (Wednesday).
Toy models for D. H. Lehmer's conjecture
(joint work with Tsuyoshi Miezaki),
��Korea-Japan Workshop on Algebra and Combinatorics��Room C32-208 at Pusan National University, February 10 (Tuesday), (speaker is Eiichi Bannai).
On the zeros of certain polynomials related to the extremal vertex operator algebras,
��Algebras, Groups and Geometries 2008���潸����������ر������ʳظ���� �쳬 ��ֵ���, 2008ǯ12��10, 11��.
On the zeros of certain polynomials associated with the extremal vertex operator algebras,
Mini-workshop in algebraic combinatorics, R204, 2F, NCTS, NCKU, Saturday, Nov. 29, 2008.
On the zeros of certain polynomials associated with the extremal
vertex operator algebras,
��119 �����ܿ��ز�彣�������, ���������������101 �ֵ���������������ۣ���, 2008ǯ10��18��.
On the Zeros of Hecke Type Faber Polynomials,
Mini-workshop in Algebraic Combinatorics ,Math Science Building room 208, Postech, February 12, 2007.
Hecke ¿�༰�ˤĤ���.,
�ȹ礻���ߥ˽���, �彣���, 2006ǯ3��.
Question and Answer Check System for Mathematics on the Web., Asian Symposium on Computer Mathematics 2005, Korea Institute for Advanced Study (KIAS), (December 2005)(with S. Toyota).
Locations of the zeros of Hecke polynomials associated with the Thompson series of the elements of the Monster ,
6th Symposium on Algebra and Computation (AC2005), Tokyo Metropolitan University (November 2005). (speaker is Eiichi Bannai).
On the zeros of Eisenstein series associated with \Gamma_0^*(2), \Gamma_0^*(3), and some groups(with J. Shigezumi and H. Nozaki)
RIMS Workshop "Algebraic Combinatorics and Related Fields of Research", Research Institute for Mathematical Sciences Kyoto University, October, 2005.
On the Zeros of Eisenstein Series for \Gamma_0^*(2) and \Gamma_0^*(3).,
The Fifth Algebraic Combinatorics Seminar, Pusan National University, (August 2005).
On the zeros of Eisenstein series associated with \Gamma_0^*(2) and \Gamma_0^*(3)(with J. Shigezumi and H. Nozaki)
The Second COE Workshop on Sphere Packing, Kyushu University, June, 2005.
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Spherical designs and Conformal designs�ʥݥ��������å�����
�ȹ礻�����ޡ���������(2009), ���������ر����, 2009ǯ 9�� 2����
Nonexistence of spherical designs obtained from integer rings
of imaginary quadratic fields�ʥݥ��������å�����
�ֲƤγع���Designs and Codes��(�ҥ륺����ԥ�����)��2009ǯ 6��21��.
Toy models for D. H. Lehmer's conjecture
���������������������ز����ò����������ء�2009ǯ 5�