### Regular Positions Held

**Associate Professor**

Research Alliance Center for Mathematical Sciences, Tohoku University

Dec 2022 – present**Associate Professor**

Graduate School of Information Sciences, Tohoku University

Aug 2012 – present**Associate Professor**

Research Alliance Center for Mathematical Sciences, Tohoku University

Apr 2017 – Mar 2022**Assistant Professor**

Graduate School of Information Sciences, Tohoku University

Oct 2007 – Jul 2012

### Pre/Post-Doctoral & Visiting Positions Held

**Honorary Fellow**

Department of Mathematics, University of Wisconsin

Mar 2010 – Mar 2011

host: Paul Terwilliger

[Unpaid visiting research position. Supported by JSPS Excellent Young Researchers Overseas Visit Program.]**Visiting Scholar**

Department of Mathematics, Massachusetts Institute of Technology

Apr 2007 – Jun 2007

[Unpaid visiting research position.]**Affiliate Assistant Professor**

Department of Mathematical Sciences, Worcester Polytechnic Institute

Apr 2007 – Sep 2007

host: Bill Martin

[Unpaid visiting research position. Supported by JSPS Postdoctoral Fellowship for Research Abroad.]**Visiting Researcher**

Combinatorial and Computational Mathematics Center, Pohang University of Science and Technology

Aug 2006 – Sep 2006

host: Jack Koolen**JSPS Research Fellow (PD)**

Apr 2004 – Mar 2007

host: Akihiro Munemasa

affiliation: Graduate School of Information Sciences, Tohoku University**JSPS Research Fellow (DC1)**

Apr 2001 – Mar 2004

advisor: Eiichi Bannai

affiliation: Graduate School of Mathematics, Kyushu University

### Education

**Ph.D., Mathematics**

Kyushu University

Apr 2001 – Mar 2004

[See also my record at Mathematics Genealogy Project.]**M.S., Mathematics**

Kyushu University

Apr 1999 – Mar 2001

**B.S., Mathematics**

Kyushu University

Apr 1995 – Mar 1999

### Grants

**JSPS Grant-in-Aid for Scientific Research (C)**

No. 23K03064 (PI)

Apr 2023 – Mar 2026**JSPS Grant-in-Aid for Scientific Research (C)**

No. 20K03551 (PI)

Apr 2020 – Mar 2023**JSPS Grant-in-Aid for Scientific Research (B)**

No. 19H01789 (Co-I)

Apr 2019 – Mar 2023**JSPS Grant-in-Aid for Scientific Research (C)**

No. 17K05156 (PI)

Apr 2017 – Mar 2020**JSPS Grant-in-Aid for Scientific Research (C)**

No. 25400034 (PI)

Apr 2013 – Mar 2017**JSPS Grant-in-Aid for Young Scientists (B)**

No. 23740002 (PI)

Apr 2011 – Mar 2013**JSPS Excellent Young Researchers Overseas Visit Program**

Mar 2010 – Mar 2011**JSPS Grant-in-Aid for Young Scientists (B)**

No. 20740003 (PI)

Apr 2008 – Mar 2011**JSPS Postdoctoral Fellowship for Research Abroad**

Apr 2007 – Sep 2007**Grant-in-Aid for JSPS Fellows**

No. 04J02964

Apr 2004 – Mar 2007**Grant-in-Aid for JSPS Fellows**

No. 01J10366

Apr 2001 – Mar 2004

### Professional Memberships

**Mathematical Society of Japan**

Member

Sep 2001 – present**Institute of Combinatorics and its Applications**

Member

Jan 2017 – present

### Postdoctoral Researchers

**Jon Xu**

JSPS International Research Fellow

Jun 2019 – May 2021**Jae-Ho Lee**

JSPS International Research Fellow

Aug 2014 – Aug 2016

[now Assistant Professor at University of North Florida]

### Graduate Students

**Masoumeh Koohestani**

Special Research Student

Feb 2020 – Jul 2020**Mohamed Sabri Mohamed Fuard**

Ph.D.

Oct 2019 – Sep 2022**Shunsuke Ito**

M.S.

Apr 2019 – Mar 2021**Tao Wang**

Ph.D.

Oct 2018 – Sep 2021**Alexandre Louvet**

Special Research Student

Oct 2018 – Feb 2019**Alejandro Saiz**

Special Research Student

Oct 2018 – Feb 2019**Kohei Iwabuchi**

M.S.

Apr 2017 – Mar 2019**John Vincent Morales**

Ph.D.

Oct 2014 – Sep 2017

[now Associate Professor at De La Salle University]**Yuta Watanabe**

M.S. & Ph.D.

Apr 2013 – Mar 2018

[now Senior Assistant Professor at Aichi University of Education]

### Graduate Courses

Semester/Year | Course |
---|---|

Spring 2021 | Topics in Mathematics "Spectra of graphs" [delivered in English] |

Spring 2019 | Topics in Mathematics "Spectra of graphs" [delivered in English] |

Spring 2017 | Mathematical Structures IIb "Spectra of graphs" |

Spring 2015 | Mathematical Structures IIb "Introduction to Leonard pairs" |

Spring 2013 | Mathematical Structures IIb "Introduction to Leonard pairs" |

### Undergraduate Courses

Calculus A = Single Variable Calculus

Calculus B = Multiariable Calculus

Calculus C = Ordinary Differential Equations

Semester/Year | Course |
---|---|

Fall 2022 | Calculus B ×2, Foundations of Calculus |

Spring 2022 | Calculus A |

Fall 2021 | Calculus B, Foundations of Calculus |

Spring 2021 | Calculus A |

Fall 2020 | Calculus B ×2, Foundations of Calculus |

Spring 2020 | Calculus C |

Fall 2019 | Calculus B |

Spring 2019 | Calculus A, Calculus C |

Fall 2018 | Calculus B ×2 |

Spring 2018 | Calculus A, Calculus C |

Fall 2017 | Calculus B |

Fall 2016 | Calculus B ×2, Foundations of Calculus |

Spring 2016 | Calculus A |

Fall 2015 | Calculus B, Foundations of Calculus |

Spring 2015 | Calculus A |

Fall 2014 | Calculus B ×2 |

Spring 2014 | Calculus A ×2 |

Fall 2013 | Calculus B ×2 |

Spring 2013 | Calculus A |

Fall 2012 | Calculus B ×2 |

Fall 2011 | Calculus B |

Fall 2009 | Calculus B |

Fall 2008 | Calculus B |

### Other Teaching Activities

**Workshop on Topics in Algebraic Graph Theory**

Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, Indonesia

Mar 18, 19, 25, 2015 (3+3+2.5=8.5hrs)

[delivered in English]**Delsarte 理論入門**

(Introduction to Delsarte Theory)

代数的組合せ論 ｢夏の学校 2014｣

(Algebraic Combinatorics Summer School 2014)

Akiu Resort Hotel Crescent, Sendai, Japan

Jun 16, 2014 (2hrs)-
**$\boldsymbol{\mathbb{Z}_4}$-Kerdock codes, orthogonal spreads, and extremal Euclidean line-sets**

夏の学校 ｢Designs and Codes｣

(Summer School "Designs and Codes")

Hills Sunpia Yamagata, Yamagata, Japan

Jun 23, 2009 (3.5hrs)

[delivered in English, an introductory lecture of a paper by Calderbank, Cameron, Kantor, Seidel]