Izunaga Yoichi

Profile Information

Affiliation: Associate Professor, Faculty of Economics, Kyushu University

Degree: 博士（工学）(筑波大学)
修士（経済学）(山口大学)

Researcher number: 40811683
ORCID iD: https://orcid.org/0000-0003-2113-3630
J-GLOBAL ID: 201801011331638102
researchmap Member ID: 7000024896

External link: https://izunaga.github.io/

Research Areas

Research History

Dec, 2023 - Present

Associate Professor, Faculty of Economics, Kyushu University
Apr, 2021 - Nov, 2023

Lecturer, Faculty of Economics, Kyushu University
Apr, 2019 - Mar, 2021

Faculty of Engineering Department of Information System Creation, Kanagawa University
Jul, 2017 - Mar, 2019

Assistant Professor
Apr, 2016 - Jun, 2017

Researcher

Education

Apr, 2011 - Mar, 2016

University of Tsukuba
Apr, 2009 - Mar, 2011

Graduate School, Division of Economics, Yamaguchi University
Apr, 2005 - Mar, 2009

Faculty of Economics, Yamaguchi University

Committee Memberships

Apr, 2018 - Present

編集委員, 日本OR学会機関誌編集委員会
Nov, 2021

九州支部事業「九州地区における若手OR研究交流会」実行委員, 日本オペレーションズ・リサーチ学会
Sep, 2021

秋季研究発表会実行委員, 日本オペレーションズ・リサーチ学会
Mar, 2018 - Feb, 2021

幹事, 日本OR学会常設研究部会「評価のOR」
Aug, 2018

実行委員, 日本OR学会 60 周年記念事業本部SSOR2018
Apr, 2016 - Mar, 2018

編集幹事, 日本OR学会論文誌編集委員会
Dec, 2017

委員, Franco-Japanese Days on Combinatorics and Optimization 2017, Organizing committee
Jul, 2017

委員, 2nd International Conference on Social Informatics and Systems Science, Program committee

Awards

Papers

Analyzing the impact of promotional events for an E-commerce website: A state-space model approach

Bulletin of the Computational Statistics of Japan, 37(1) 43-52, 2024 Peer-reviewed
子育て母親向けアプリユーザーのネットワークの構築とその分析

菊池明飛, 長野嵩太郎, Shurong Sun, 北原知就, 伊豆永洋一

計算機統計学, 36(1) 5-13, 2023 Peer-reviewed
A Subject Experiment of an Approximate DGS Algorithm: Price Increment, Allocative Efficiency, and Seller’s Revenue

Yoichi Izunaga, Satoshi Takahashi, Naoki Watanabe

2022 IEEE International Conference on Big Data (Big Data), 3273-3280, Dec 17, 2022 Peer-reviewed
An experimental study of VCG mechanism for multi-unit auctions: competing with machine bidders

Satoshi Takahashi, Yoichi Izunaga, Naoki Watanabe

Evolutionary and Institutional Economics Review, 19 97-117, Apr, 2022 Peer-reviewed
A doubly nonnegative relaxation for modularity density maximization

Yoichi Izunaga, Tomomi Matsui, Yoshitsugu Yamamoto

Discrete Applied Mathematics, 275 69-78, Mar, 2020 Peer-reviewed
VCG mechanism for multi-unit auctions and appearance of information: a subject experiment

Satoshi Takahashi, Yoichi Izunaga, Naoki Watanabe

Evolutionary and Institutional Economics Review, 16(2) 357-374, Dec, 2019 Peer-reviewed
空域編成に対する 2 つの最適化アプローチ

猿渡康文, 伊豆永洋一, 鵜飼孝盛, 蔭山康太

航空無線, (101) 29-36, Oct, 2019 Invited
An enhanced MILP-based branch-and-price approach to modularity density maximization on graphs

Keisuke Sato, Yoichi Izunaga

Computers & Operations Research, 106 236-245, Jun, 2019 Peer-reviewed
An approximation algorithm for multi-unit auctions: Numerical and subject experiments

Satoshi Takahashi, Yoichi Izunaga, Naoki Watanabe

Operations Research and Decisions, 28(1) 95-115, 2018 Peer-reviewed
A bounding algorithm for selective graph coloring problem

Yoichi Izunaga, Keisuke Sato

RIMS Kôkyûroku, (2069) 84-94, 2018
A cutting plane algorithm for modularity maximization problem

Yoichi Izunaga, Yoshitsugu Yamamoto

Journal of the Operations Research Society of Japan, 60(1) 24-42, Mar 1, 2017 Peer-reviewed
Row and column generation algorithm for maximization of minimum margin for ranking problems

Yoichi Izunaga, Keisuke Sato, Keiji Tatsumi, Yoshitsugu Yamamoto

Operations Research Proceedings 2014, 249-255, 2016 Peer-reviewed
A Lagrangian relaxation algorithm for modularity maximization problem

Kotofumi Inaba, Yoichi Izunaga, Yoshitsugu Yamamoto

Operations Research Proceedings 2014, 241-247, 2016 Peer-reviewed
Row and column generation algorithms for minimum margin maximization of ranking problems

Yoichi Izunaga, Keisuke Sato, Keiji Tatsumi, Yoshitsugu Yamamoto

Journal of the Operations Research Society of Japan, 58(4) 394-409, 2015 Peer-reviewed
最小取引単位を考慮したポートフォリオ最適化

伊豆永洋一

経営情報学会誌, 20(3) 185-201, 2011 Peer-reviewed

Misc.

A scalable mixed-integer conic optimization approach to cardinality-constrained Poisson regression with safe screening

Kota Kurihara, Yoichi Izunaga

Apr 17, 2025
本部 SSOR 2018開催報告

成島康史, 田中未来, Phung-Duc Tuan, 伊豆永洋一, 鵜飼孝盛, 奥野貴之, 黒沢健, 田中健一

オペレーションズ・リサーチ: 経営の科学, 64(3) 147-155, Mar, 2019 Invited
A DOUBLY NONNEGATIVE RELAXATION FOR MODULARITY DENSITY MAXIMIZATION (Optimization for the new age : modeling method and numerical calculation)

Izunaga Yoichi, Matsui Tomomi, Yamamoto Yoshitsugu

RIMS Kokyuroku, 1981 84-97, Jan, 2016
アクセスログデータ可視化の試み

鮏川矩義, 正木俊行, 伊豆永洋一, 佐藤俊樹, 石濱友裕, 田中彰浩, 中島雄基, 舟橋史明

オペレーションズ・リサーチ：経営の科学, 58(2) 74-79, Feb, 2013 Invited

Professional Memberships

Sep, 2023 - Present

The Japan Society for Industrial and Applied Mathematics
Mar, 2011 - Present

The Operations Research Society of Japan

Research Projects

信頼性と汎用性を備えたクラスタリング手法の確立

科学研究費助成事業若手研究, 若手研究, 日本学術振興会, Apr, 2022 - Mar, 2026

伊豆永洋一
デジタル技術と電力の融合による新たな電力ビジネスと持続可能な社会への影響分析

科学研究費助成事業国際共同研究加速基金(国際共同研究強化(B)), 国際共同研究加速基金(国際共同研究強化(B)), 日本学術振興会, Oct, 2020 - Mar, 2024

後藤美香, 七原俊也, 鎗目雅, 伊豆永洋一, 時松宏治
医療サービスとそのネットワーク化のメカニズム分析

基盤研究(C), 独立行政法人日本学術振興会, Apr, 2015 - Mar, 2018

猿渡康文
モジュラリティ最大化問題に対するラグランジュ緩和に基づくアルゴリズムに関する研究

公益財団法人村田学術振興財団平成27年度研究者海外派遣援助, Jul, 2015

Profile Information

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Misc.

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