Junichi Shigezumi

J-GLOBAL         Last updated: Aug 23, 2016 at 09:03
 
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Name
Junichi Shigezumi
E-mail
j1.shigezumigmail.com
Affiliation
Fujitsu Laboratories Ltd.
Degree
Doctor of Mathematics(Kyushu University), Master of Science(Kyushu University)
ORCID ID
0000-0002-0034-5821

Research Areas

 
 

Academic & Professional Experience

 
Oct 2012
 - 
Today
Fujitsu Laboratories Ltd.
 
Apr 2012
 - 
Sep 2012
Post-doctoral Fellow, Innovation Training Program Center, Kyushu University
 
Apr 2011
 - 
Mar 2012
Post-doctoral Fellow, Institute of Mathematics for Industry, Kyushu Univ.
 
Jul 2009
 - 
Mar 2011
Post-doctoral Fellow, Fac. Math. Kyushu Univ.
 
Apr 2009
 - 
Jun 2009
Researcher, Fac. Math. Kyushu Univ.
 

Published Papers

 
J. Shigezumi, T. Asai, H. Morikawa, H. Inakoshi
Proceedings of the 4th ACM SIGSPATIAL International Workshop on Analytics for Big Geospatial Data   25-34   Nov 2015   [Refereed]
In this paper, we present a fast and practical algorithm for a map-matching problem searching a path on a given graph that minimizes Fréchet distance from a given trajectory, which is a natural measurement based on the sequential order of the traj...
Eiichi Bannai, Etsuko Bannai and Junichi Shigezumi
Ann. Comb.   16(4) 651-659   Dec 2012   [Refereed]
Euclidean Tex-designs, which are finite weighted subsets of Euclidean space, were defined by Neumaier-Seidel (1988). A tight Tex-design is defined as a Tex-design whose cardinality is equal to the known natural lower bound.

In this paper, we give...
Eiichi Bannai, Takahiro Sato, Junichi Shigezumi
Discrete Mathematics   312(22) 3283-3292   Nov 2012   [Refereed]
We classify the maximal m-distance sets in Tex which contain the representation of
the Johnson graph Tex for Tex. Furthermore, we determine the necessary and
sufficient condition for Tex and Tex such that the representa...
Junichi Shigezumi
Osaka J. Math.   47(2) 487-505   Jun 2010   [Refereed]
We determine the location of all of the zeros of certain Poincaré series associated with the Fricke groups Tex and Tex in their fundamental domains by applying and extending the method of F.K.C. Rankin and H.P.F. Swinne...
Junichi Shigezumi
Asian-European Journal of Mathematics   2(2) 239-253   Jun 2009   [Refereed]
A set of vectors all of which have a constant (non-zero) norm value in an Euclidean lattice is called a shell of the lattice. Venkov classified strongly perfect lattices of minimum Tex (Réseaux et ``designs'' sphérique, 2001), whose minima...

Misc

 
Maruhashi, K.; Shigezumi, J.; Yugami, N.; Faloutsos, C.
Data Mining Workshops (ICDMW), 2012 IEEE 12th International Conference on   234-241   Dec 2012   [Refereed]
Estimating the distances of the shortest path between given pairs of nodes in a graph is a basic operation in a wide variety of applications including social network analysis, web retrieval, etc. Such applications require a response on the order o...
Junichi Shigezumi
Ph. D. Thesis      Mar 2009   [Refereed]
[[Part I]]: On the zeros of certain modular functions [Ch. 1]: On the zeros of Eisenstein series for Tex and Tex [Ch. 2]: On the zeros of Eisenstein series for Tex and Tex [Ch. 3]: On the zeros of ce...
Tsuyoshi Miezaki, Hiroshi Nozaki, and Junichi Shigezumi
RIMS Kokyuroku   1476 57-64   Mar 2006
Tsuyoshi Miezaki, Hiroshi Nozaki and Junichi Shigezumi
The Proceedings of Second COE Workshop on Sphere Packings   131-135   Nov 2005

Conference Activities & Talks

 
Junichi Shigezumi
Mini-Workshop "Algebraic Combinatorics" (Japanese)   Mar 2010   
We introduce a new example of Euclidean tight 6-design of Tex supported by two concentric spheres. Let the design Tex be split as Tex, and Tex. Then each Tex is a spherical 4-design, and Tex is tight....
Junichi Shigezumi
Mini-Workshop on Algebra and Combinatorics 2009   Aug 2009   Junichi Shigezumi, Katsuhiko Ono
Let Tex be a prime, and we consider supersingular elliptic curves over a field Tex of characteristic Tex. Then, the polynomial Tex, every root of which is Tex-invariant of some supersingular elliptic curve, is called a {\it supersingular ...
Certain classifications of lattices and spherical designs
Junichi Shigezumi
The 1st Kumjung Seminar   Feb 2009   
A lattice, whose minimal shell is a spherical 5-design, is said to be strongly perfect. B. B. Venkov classified strongly perfect lattices of minimum 3. We talk about the classification of integral lattices whose shells of norm 3 are 5-designs.

We...
On the zeros of Eisenstein series for Fuchsian groups of first kind
Junichi Shigezumi
2nd Japanese-German Number Theory Workshop   Feb 2008   
We talk about the location of the zeros of the Eisenstein series of one variable which is associated with genus zero Fuchsian groups of the first kind having 1 as a cusp. We introduce small generalization of the result of Professor Heekyoung Hahn,...
On the zeros of Eisenstein series associated with Tex and Tex
Tsuyoshi Miezaki, Hiroshi Nozaki, and Junichi Shigezumi
The Second COE Workshop on Sphere Packing   Jun 2005   

Research Grants & Projects

 
Min. Ed. Cult. Sci. Tech.: Grants-in-Aid for JSPS Fellows
Project Year: 2007 - 2008    Investigator(s): Junichi Shigezumi