Ph.D., The University of Tokyo, Mar. 2023

Open Innovation Platforms

Socio-technical Transitions

Virtual Economy

Game Theory

Multi-agent Simulation

Economic Experiment

Time Series Analysis

Social infrastructure (civil Engineering, architecture, disaster prevention), Social systems engineering, Technology management

Humanities & social sciences, Business administration, Innovation management

Social infrastructure (civil Engineering, architecture, disaster prevention), Social systems engineering, Industrial engineering

Natural sciences, Applied mathematics and statistics, Operations research

Humanities & social sciences, Theoretical economics, Business economics

Apr. 2025 - Present
Nihon University, Department of Business Administration, College of Commerce, Assistant Professor

Apr. 2023 - Mar. 2025
The University of Tokyo, Department of Technology Management for Innovation, Graduate School of Engineering, Project researcher

Apr. 2022 - Mar. 2023
The University of Tokyo, Department of Technology Management for Innovation, Graduate School of Engineering, Academic specialist

Dec. 2015 - Nov. 2018
Republic of Korea Naval Academy, Department of National Defense Management, Division of Science, Full-time Instructor

Apr. 2015 - Mar. 2023
The University of Tokyo, Graduate School of Engineering, Doctoral program, Department of Technology Management for Innovation

Apr. 2013 - Mar. 2015
The University of Tokyo, Graduate School of Engineering, Master's program, Department of Technology Management for Innovation

Apr. 2009 - Mar. 2013
The University of Tokyo, Faculty of Engineering, Bachelor's program, Department of Systems Innovation

Jun. 2023
Group Decision and Negotiation Section, INFORMS, 2023 GDN Springer Best Student Paper Award
Weighted Reward Allocation Mechanism for Data Collection Quality
Ayato Kitadai;Sinndy Dayana Rico Lugo;Sangjic Lee;Masanori Fujita;Nariaki Nishino

Transformation of Many-to-One to One-to-One Matching Problems Through Replication
Sangjic Lee; Ayato Kitadai; Ye Cheng; Nariaki Nishino
IFIP Advances in Information and Communication Technology, Aug. 2025, Refereed, Not invited
Lead

Mechanism Design as Collaborative Production Systems
Ryuichiro Ishikawa; Hideyasu Karasawa; Sangjic Lee; Hajime Mizuyama; Nariaki Nishino; Kohei Nishiyama; Shigeru Ono; Shota Suginouchi
IFIP Advances in Information and Communication Technology, 2024, Refereed

Weighted Reward Allocation Mechanism for Data Collection Quality
Ayato Kitadai; Sinndy Dayana Rico Lugo; Sangjic Lee; Masanori Fujita; Nariaki Nishino
Lecture Notes in Business Information Processing, 2023, Refereed

Game Theoretic Modeling of User Innovation and Venture M&A Processes
Sangjic Lee; Kohei Nishiyama; Nariaki Nishino
The Human Side of Service Engineering, 2023, Refereed
Lead

Co-creation and Personalization as Incentive Mechanisms of Utilizing External Innovation Sources: Which Performs Better?
Lee, Sangjic; Nishiyama, Kohei; Kimita,Koji; Nishino,Nariaki
Asian Journal of Innovation and Policy, Dec. 2021, Refereed, Not invited
Lead

The dynamics of industry convergence in the automotive industry: A technological perspective analysis using patent data
Jinwoo Choi; Sangjic Lee; Yeong Wha Sawng
Journal of Scientific and Industrial Research, 2019, Refereed

Foresight of promising technologies for healthcare-IoT convergence service by patent analysis
Sangjic Lee; Jinwoo Choi; Yeong Wha Sawng
Journal of Scientific and Industrial Research, 2019, Refereed
Lead

Dispersed Energy Storage and Its Effect on Market Efficiency in Electricity Trading with Distributed Power Resources: An Experimental Economics Study
Sangjic Lee; Ryuichi Uda; Kenju Akai; Nariaki Nishino
Serviceology for Smart Service System, 2017, Refereed
Lead

Effect of Energy Storage on Decentralized Electricity Market
李 相直; 赤井 研樹; 西野 成昭
IEICE Technical Report, Jul. 2013

Transformation of Many-to-One to One-to-One Matching Problems Through Replication
Sangjic Lee; Ayato Kitadai; Ye Cheng; Nariaki Nishino
44th IFIP WG 5.7 Advances in Production Management Systems International Conference (APMS 2025), Sep. 2025, Not invited

Optimal Threshold Design for Crowdsource-based Manufacturing: A Game-Theoretic Approach
Takuma Kurihara; Ryo Miyajima; Mizuki Kobayashi; Sangjic Lee; Kohei Nishiyama; Nariaki Nishino
19th CIRP Conference on Intelligent Computation in Manufacturing Engineering (CIRP-ICME 2025), Jul. 2025, Not invited

How Can Barriers to Innovation Diffusion and Transition Be Identified from Bibliometric Data? Insights from LDA-Based Topic Modeling
HoHei Cheng; Sangjic Lee; Hikaru Watanabe; Ayato Kitadai; Yumiko Nagoh; Masanori Fujita; Nariaki Nishino
R&D Management Conference 2025, Jul. 2025, Not invited

Consensus Formation in Physical, Virtual, and Interverse Spaces: Experimental Insights
Ayato Kitadai; Ryuichiro Ishikawa; Sangjic Lee; Jianyong Teng; Kohei Nishiyama; Nariaki Nishino
25th International Conference on Group Decision and Negotiation (GDN 2025), Jun. 2025, Not invited

バーチャルエコノミーに向けたサービス設計の新視点：空間の差異がコミュニケーションにもたらす影響
北代 絢大; 石川 竜一郎; 李 相直; 滕 健勇; 西山 浩平; 西野 成昭
サービス学会第13回国内大会, Mar. 2025, Not invited

アイデアコンテスト型クラウドソーシングにおける必要投票数の最適化に関する研究：LEGO Ideasを事例として
栗原 拓馬; 宮島 崚; 小林 美充希; 李 相直; 西山 浩平; 西野 成昭
サービス学会第13回国内大会, Mar. 2025, Not invited

新製品開発における意思決定支援ツールの提案：LLMとマッチングモデルを活用して
渡邊光; 北代絢大; 永合由美子; 李相直; 夏目哲; 宮原史明; 藤田正典; 西野成昭
サービス学会第13回国内大会, Mar. 2025, Not invited

Mechanism Design as Collaborative Production Systems
Ryuichiro Ishikawa; Hideyasu Karasawa; Sangjic Lee; Hajime Mizuyama; Nariaki Nishino; Kohei Nishiyama; Shigeru Ono; Shota Suginouchi
43rd IFIP WG 5.7 Advances in Production Management Systems International Conference (APMS 2024), Sep. 2024

Incentive Mechanism for Continuous Consumption under Habit Formation and Satiation Utility Model
Sangjic Lee; Yitao Xu; Hiroki Takahashi; Nariaki Nishino
18th CIRP Conference on Intelligent Computation in Manufacturing Engineering (CIRP-ICME 2024), Jul. 2024

A Comparative Analysis of External Innovation Mechanisms
Sangjic Lee; Kohei Nishiyama; Nariaki Nishino
34th Annual Production and Operations Management Society Conference (POMS 2024), Apr. 2024

Transformation of One-to-Many to One-to-One Matching Problems Through Replication
成也; 澤崎遙夏; 西野成昭; 北代絢大; 李相直
サービス学会第12回国内大会, Mar. 2024

External Innovation Mechanisms: A Modeling-based Comparative Analysis
Sangjic Lee; Kohei Nishiyama; Nariaki Nishino
2023 INFORMS Annual Meeting, Oct. 2023

Game Theoretic Modeling of User Innovation and Venture M&A Processes
Sangjic Lee; Kohei Nishiyama; Nariaki Nishino
14th International Conference on Applied Human Factors and Ergonomics and the Affiliated Conferences (AHFE 2023), Jul. 2023

Weighted Reward Allocation Mechanism for Data Collection Quality
Ayato Kitadai; Sinndy Dayana Rico Lugo; Sangjic Lee; Masanori Fujita; Nariaki Nishino
23rd International Conference on Group Decision and Negotiation (GDN 2023), Jun. 2023

価値共創プラットフォームサービスのゲーム理論的モデリング：イノベーションコンテストとユーザーコミュニティメカニズム
李相直; 西山浩平; 西野成昭
サービス学会第11回国内大会, Mar. 2023

メカニズムデザイン理論による共創とパーソナライゼーションの⽐較
李相直; 西山浩平; 西野成昭
サービス学会第8回国内大会, Mar. 2020

Comparative Analysis of User Innovation Mechanisms: A Mechanism Design Approach
Sangjic Lee; Kohei Nishiyama; Nariaki Nishino
2019 INFORMS Annual Meeting, Oct. 2019

Foresight of Promising Technologies for Smart Convergence Service by Big Data based Patent Analysis: Focused on the Healthcare-IoT Convergence Service
Sangjic Lee; Yeong-wha Sawng
日本マネジメント学会第77回全国研究大会, Jun. 2018

Dispersed Energy Storage and Its Effect on Market Efficiency in Electricity Trading with Distributed Power Resources: An Experimental Economics Study
Sangjic Lee; Ryuichi Uda; Kenju Akai; Nariaki Nishino
The International Conference of Serviceology 2015 (ICServ2015), Jul. 2015

分散型電力取引における蓄電池構成と市場効率性に関する研究
李相直; 西野成昭; 赤井研樹
日本経営工学会2015年春季大会, May 2015

技術及び選好が非均質な状況下での製品開発戦略のゲーム理論的分析
李相直; 赤井研樹; 西野成昭
日本MOT学会2014年度年次研究発表会, Mar. 2015

分散型電力取引における蓄電行為の影響
李相直; 赤井研樹; 西野成昭
電子情報通信学会人工知能と知識処理研究会, Jul. 2013

Data Analysis
Apr. 2025 - Present
Nihon University

Probability and Statistics
Mar. 2016 - Dec. 2018
Republic of Korea Naval Academy

Services Marketing
Mar. 2016 - Jul. 2018
Republic of Korea Naval Academy

Strategic Management
Sep. 2016 - Dec. 2017
Republic of Korea Naval Academy

Engineering Economics
Mar. 2016 - Jul. 2016
Republic of Korea Naval Academy

Theory Construction of Basic Research Implementation
Sony Computer Science Laboratories, Inc., 民間等との共同研究, Jul. 2022 - Jul. 2025
Nariaki Nishino; Masanori Fujita; Sangjic Lee; Sinndy Dayana Rico Lugo; Ayato Kidatadai; Hikaru Watanabe; HoHei Cheng; Yumiko Nagoh

Development of Interverse Technology to Enhance Human Communication
New Energy and Industrial Technology Development Organization (NEDO), Cross-ministerial Strategic Innovation Promotion Program (SIP) Phase 3: Development of Fundamental Technologies and Frameworks for the Expansion of the Virtual Economy, Sep. 2023 - Mar. 2025

分散型電源と需要家間の最適マッチングを実現するメカニズムの設計
東京電力パワーグリッド株式会社, Apr. 2023 - Dec. 2024

Why Users Do (Not) Come Back? Repeated Contribution to Crowdsourcing Platforms
Feb. 2020 - Oct. 2023
Christoph Grimpe; Marion Poetz; Sangjic Lee; Kohei Nishiyama