Masuda, Yasushi

写真a

Affiliation

Faculty of Science and Technology (Mita)

Position

Professor Emeritus

Related Websites

External Links
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Career 【 Display / hide 】

  • 1987.07
    -
    1993.06

    カリフォルニア大学リバーサイド校アンダーソン経営学大学院, Assistant Professor

  • 1993.07
    -
    1996.04

    カリフォルニア大学リバーサイド校アンダーソン経営学大学院, Associate Professor

  • 1996.04
    -
    2002.03

    慶應義塾大学理工学部 ,助教授

  • 1997.04
    -
    1999.03

    兼慶應義塾大学学生総合センター ,委員（学生担当）

  • 2001.04
    -
    2003.03

    兼慶應義塾大学理工学部管理工学科 ,学習指導副主任

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Academic Background 【 Display / hide 】

  • 1980.03

    Keio University, Faculty of Science and Engineering, 管理工学科

    University, Graduated

  • 1982.03

    Keio University, Graduate School, Division of Science and Engineering

    Graduate School, Completed, Master's course

  • 1987.06

    University of Rochester, Simon School of Business Administration, Business Administration

    United States, Graduate School, Completed, Doctoral course

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Academic Degrees 【 Display / hide 】

  • Ph.D., University of Rochester, 1987.06

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Research Areas 【 Display / hide 】

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Social systems engineering (Social System Engineering/Safety System)

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Safety engineering (Social System Engineering/Safety System)

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Research Keywords 【 Display / hide 】

  • Management Science

  • Pricing

  • Stochastic Modeling

  • congestion control

  • game theory

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Research Themes 【 Display / hide 】

  • Pricing, 

    1992.01
    -
    Present

  • Congestion Control, 

    1990.01
    -
    Present

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Books 【 Display / hide 】

  • サービスサイエンスの事訳：データサイエンスと数理科学の融合に向けて

    増田 靖、高木英明, 筑波大学出版会, 2017.10

    Scope: 第7章戦略的レベニューマネジメント（pp287-332）

  • サービスサイエンスことはじめ：数理モデルとデータ分析によるイノベーション

    増田 靖、高木英明, 筑波大学出版会, 2014

    Scope: 第7章レベニューマネジメント　pp211-248

  • Queueing and Related Models, U.N. Bhat, I.V. Basawa ed.

    U. Sumita, Y. Masuda, Oxford Univ. Press, 1992

    Scope: "Dynamic Analysis of Matrix Lindley Process with Replacement" pp47-64

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Papers 【 Display / hide 】

  • EX ANTE USER EQUILIBRIUM OF CAPACITATED NETWORKS

    Masuda Y., Shigemasa T.

    Journal of the Operations Research Society of Japan 66 ( 2 ) 130 - 141 2023.06

    ISSN  04534514

    　View Summary

    The Wardrop equilibrium model is widely used for traffic pattern prediction in transportation networks. One of the reasons is that this model can be converted into an equivalent optimization problem, which makes the numerical evaluation of the equilibrium straightforward and efficient. This conversion approach has been extended to networks with link capacities. It is known that the solution of the resulting constrained optimization problem is a flow pattern satisfying an extension of the Wardrop equilibrium. However, the converse does not hold true. We resolve this gap by equilibrium refinement.

  • Digitization and profitability

    Yasushi Masuda, Seungjin Whang

    Information Systems and e-Business Management (Springer)  19 ( 2 ) 389 - 403 2019.11

    Research paper (scientific journal), Accepted,  ISSN  16179846

    　View Summary

    © 2019, The Author(s). Consider a monopolistic vendor who faces a known demand curve. By setting a price that equates marginal revenue with marginal cost, the vendor will maximize his profit. This logic holds true of both physical and digital goods. But since digitization will lower the variable production cost, it will strictly increase the profit to the vendor. Then, can we conclude that digitization always improves the vendor’s profitability? Not necessarily. Now consider what will happen on the next day of the sales. Facing deterministic demand, the physical goods vendor must have prepared the exact quantity of the product to sell, and thus all products are sold out. By contrast, the digital goods vendor will have no stock out, thanks to the nature of the digital good. Therefore, the rational vendor will try to sell more and achieve a higher profit after the sales date. To this end, the vendor will now lower the price to attract additional customers with lower reservation prices. The process will indefinitely continue. Knowing this would happen, customers will wait for the price reduction. Even the customers who would have purchased on the first day would defer the purchase until price gets lower. The digital goods vendor will anticipate this and accordingly lower the price on the first day and later, thereby compromising his profitability. Note that this downward spiral takes place as a result of digitization. Thus, digitization may not necessarily improve the profitability to the vendor. We develop an economic model to formally analyze the impact of digitization on the profitability to the vendor.

  • Congestion Control for a System with Parallel Stations and Homogeneous Customers Using Priority Passes

    Yasushi Masuda, Akira Tsuji

    Networks and Spatial Economics (Networks and Spatial Economics)  19 ( 1 ) 293 - 318 2019.03

    Research paper (scientific journal), Accepted,  ISSN  1566113X

    　View Summary

    We consider a game theoretic congestion model with parallel nodes and homogeneous customers. The purpose of this paper is to examine how the priority passes improve social welfare for such a system. To this end, we prove the existence of an equilibrium. The system with no priority pass has a unique equilibrium. With the introduction of priority passes, the uniqueness of the equilibrium may be destroyed. We provide a sufficient condition under which the system with priority passes outperforms the system with no priority passes. The problem is explored numerically as well.

  • Impact of technology development costs on licensing form in a differentiated Cournot duopoly

    Tatsuya Kitagawa, YASUSHI MASUDA , Masashi Umezawa

    International Journal of Economic Theory (International Journal of Economic Theory)  16 ( 2 ) 153 - 166 2018.07

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  17427355

    　View Summary

    We investigate how the type of innovation, either of product or process, influences the licensing scheme. For product innovation, we consider a licensing scheme for a patent holder of a new product facing a potential rival who may invest in technology innovation and enter the market for the new product. The alternative forms of licensing schemes considered are fixed fees and royalties. We then compare this licensing scheme for product innovation with that for process innovation studied in the literature.

  • Comparing performance based and product warranty contracts

    MASUDA YASUSHI and Haruhiko Miho

    Proceedings of 5th World Conference on Production and Operations Management  2016.09

    Research paper (international conference proceedings), Joint Work, Accepted

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Papers, etc., Registered in KOARA 【 Display / hide 】

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Reviews, Commentaries, etc. 【 Display / hide 】

  • 混雑制御：ディズニーランドのジレンマ

    増田 靖

    オペレーションズリサーチ学会機関誌 63 ( 8 ) 12 - 18 2018.08

    Article, review, commentary, editorial, etc. (scientific journal)

  • Management Scienceの近年の動向とモデル化に関する私見

    増田 靖

    経営システム 20 ( 2 ) 56-61 2010.06

    Article, review, commentary, editorial, etc. (scientific journal)

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Presentations 【 Display / hide 】

  • Digitization and Profitability

    Y. Masuda and S. Whang,

    INFORMS Annual Meeting (Seattle, USA) , 

    2019.10
    , 

    Oral presentation (general)

  • Digitization and Profitability

    Y. Masuda, Seungjin Whang

    2019年度日本オペレーションズリサーチ学会秋季研究発表会 (東広島) , 

    2019.09
    , 

    Oral presentation (general)

  • Effect of retailer’s profit maximization on the amount of unsold products in the presence of strategic customers

    Taishi Kawahara, MASUDA YASUSHI, Hideaki Takagi

    European Conference on Operations Research (Valencia, Spain) , 

    2018.07
    , 

    Oral presentation (general), EURO

  • Priority-based Congestion Control of A Network With Homogeneous Customers

    MASUDA YASUSHI, Akira Tsuji

    INFORMS International Conference (Taipei, Taiwan) , 

    2018.06
    , 

    Oral presentation (general)

  • Congestion control for a system with parallel stations and homogeneous customers using priority passes: summary and results

    MASUDA YASUSHI, Akira Tsuji

    The Queueing Symposium: Stochastic Models and their Applications (大阪大学) , 

    2018.01
    , 

    Oral presentation (general)

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Research Projects of Competitive Funds, etc. 【 Display / hide 】

  • The Effect of firm's profit maximizing behavior on product loss

    2020.04
    -
    2023.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Principal investigator

  • 顧客の戦略的購買行動と企業の価格設定：市場の時間的セグメンテーション

    2015.04
    -
    2018.03

    Grant-in-Aid for Scientific Research, Research grant, Principal investigator

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Awards 【 Display / hide 】

  • Beta Gamma Sigma

    増田 靖, 1987

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Courses Taught 【 Display / hide 】

  • ADVANCED COURSE OF INFORMATION ECONOMICS

    2024

  • ADVANCED COURSE OF INFORMATION ECONOMICS

    2023

  • ADVANCED COURSE OF INFORMATION ECONOMICS

    2022

  • SEMINAR IN ADMINISTRATION ENGINEERING

    2021

  • PROBABILITY

    2021

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Courses Previously Taught 【 Display / hide 】

  • 確率

    Keio University

    2018.04
    -
    2019.03
    , 

    Spring Semester, Lecture

  • 情報経済学

    Keio University

    2018.04
    -
    2019.03
    , 

    Autumn Semester, Lecture, Within own ｆaculty

  • 管理工学基礎演習II

    Keio University

    2018.04
    -
    2019.03
    , 

    Autumn Semester, Seminar, Lecturer outside of Keio

  • オープンシステムマネジメント同演習

    Keio University

    2018.04
    -
    2019.03
    , 

    Autumn Semester, Seminar, Lecturer outside of Keio

  • 情報経済学特論

    Keio University

    2018.04
    -
    2019.03
    , 

    Spring Semester, Lecture

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Memberships in Academic Societies 【 Display / hide 】

  • Institute for Operations Research and the Management Sciences, 

    1995
    -
    Present

  • 日本オペレーションズリサーチ学会, 

    1995
    -
    Present

  • オペレーションズ・マネジメント＆ストラテジー学会, 

    2008
    -
    Present
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Committee Experiences 【 Display / hide 】

  • 2016.06
    -
    2018.05

    理事, オペレーションズ・マネジメント＆ストラテジー学会

  • 2013.06
    -
    2015.05

    理事, オペレーションズ・マネジメント＆ストラテジー学会

  • 2008.09
    -
    2010.03

    科学技術予測における分科会リーダー, 文部科学省

  • 2008.08
    -
    Present

    論文誌エリア編集委員, オペレーションズ・マネジメント＆ストラテジー学会

  • 2003.10
    -
    2005.03

    「科学技術の中長期的発展に関する俯瞰的予測調査」産業基盤分科会委員, 文部科学省

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