論文 - 増田　靖

EX ANTE USER EQUILIBRIUM OF CAPACITATED NETWORKS

Masuda Y., Shigemasa T.

Journal of the Operations Research Society of Japan 66 （ 2 ） 130 - 141 2023年06月

ISSN  04534514

　概要を見る

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.

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Digitization and profitability

Masuda Y., Whang S.

Information Systems and e-Business Management （Information Systems and e-Business Management）  19 （ 2 ） 389 - 403 2019年11月

研究論文（学術雑誌）, 査読有り,  ISSN  16179846

　概要を見る

© 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.

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

Masuda Y., Tsuji A.

Networks and Spatial Economics （Networks and Spatial Economics）  19 （ 1 ） 293 - 318 2019年03月

研究論文（学術雑誌）, 査読有り,  ISSN  1566113X

　概要を見る

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.

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

Kitagawa T., Masuda Y., Umezawa M.

International Journal of Economic Theory （International Journal of Economic Theory）  16 （ 2 ） 153 - 166 2018年07月

研究論文（学術雑誌）, 共著, 査読有り,  ISSN  17427355

　概要を見る

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.

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Comparing performance based and product warranty contracts

MASUDA YASUSHI and Haruhiko Miho

Proceedings of 5th World Conference on Production and Operations Management 2016年09月

研究論文（国際会議プロシーディングス）, 共著, 査読有り

Patent Strength and Optimal Two-Part Tariff Licensing with a Potential Rival

Teysuya Kitagawa, Yasushi Masuda, Masashi Umezawa

Economics Letters 123 （ 2 ） 227 - 231 2014年

研究論文（学術雑誌）, 共著, 査読有り

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収益管理問題における過剰予約：単調性と返金額

出口 翔、増田 靖

待ち行列シンポジウム報文集    183-190 2011年01月

研究論文（研究会，シンポジウム資料等）, 共著

テーマパークにおける優先パスの有効性について

辻 暁、増田 靖

待ち行列シンポジウム報文集    173-182 2011年01月

研究論文（研究会，シンポジウム資料等）, 共著

Stochastic comparisons in revenue management under a discrete choice model of consumer behavior

Hideo Miki, De-bi Cao and MASUDA YASUSHI

Journal of Operations Research Society of Japan 53 （ 3 ） 207-219 2010年09月

研究論文（学術雑誌）, 共著, 査読有り

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Second-best congestion pricing and user heterogeneity in static transportation networks

Toyokazu Kido and Yasushi Masuda

Journal of Operations Research Society of Japan 53 （ 2 ） 157-171 2010年06月

研究論文（学術雑誌）, 共著, 査読有り

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Solving Unit Commitment Problem by Combining Continuous Relaxation Method and Genetic Algorithm

Kenichi Tokoro, Yasushi Masuda and Hizakazu Nishino

Proceedings of SICE Annual Conference （The Society of Instrument and Control Engineers）     3474-3478 2008年08月

研究論文（研究会，シンポジウム資料等）, 共著, 査読有り

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An Efficient Unit Commitment Schedule by Combining Relaxation Method and Genetic Algorithm

Kenichi Tokoro, YASUSHI MASUDA and Hisakazu Nishino

IEEJ Transactions on Electronics, Information and Systems 127 （ 9 ） 1452-1459 2007年

研究論文（学術雑誌）, 共著, 査読有り

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On the Optimality of Fixed-Up-To Tariffs for Telecommunications Service

YASUSHI MASUDA, Seungjin Whang

Information Systems Research 17 （ 3 ） 247-253 2006年09月

研究論文（学術雑誌）, 共著, 査読有り

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A Cost Allocation Problem Arising in Hub–Spoke Network Systems

Nobuo Matsubayashi, Masashi Umezawa, YASUSHI MASUDA , Hisakazu Nishino

European Journal of Operational Journal 160 （ 3 ） 821-838 2005年

研究論文（学術雑誌）, 共著, 査読有り

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Evaluating all Bertrand-Nash Equilibria in Discrete Spatial Duopoly Model

MATSUBAYASIH NOBUO, UMEZAWA MASASHI,MASUDA YASUSHI, NISHINO HISAKAZU

Journal of the Operations Research Society of Japan 47 （ 1 ） 25-37 2004年01月

研究論文（学術雑誌）, 共著, 査読有り

Capacity Management in Decentralized Networks

Yasushi Masuda, Seungjin Whang

Management Science Vol.48 （ 12 ） 1628-1634 2002年12月

研究論文（学術雑誌）, 共著, 査読有り

　概要を見る

ネットワーク流が均衡によって決定されるようなシステムに関して、課金によりネットワーク流量と経路選択を同時に最適制御できることを示した。さらにシステムのボトルネックを特定する方法を提示し、設備投資方策の指針を与えた。

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Merger Effect of Two Firms under Network Equilibrium

MATSUBAYASIH NOBUO, UMEZAWA MASASHI,MASUDA YASUSHI, NISHINO HISAKAZU

European Journal of Operational Research Vol.137   434-447 2002年03月

共著, 査読有り

　概要を見る

企業が提供する様々な通信サービスは、ネットワーク上のサービスであるので、代替・補完効果が複雑に絡んでいる。本論文では、独占的競争下にある企業群の均衡分析をもとに、企業合併が利潤に与える影響を比較静学的に解析した。

A Compound Dependability Measure Arising from Semi-Markov Reliability Model

Y Masuda, S Yamakawa

Journal of Operations Research Society of Japan Vol.40   390-400 2000年12月

研究論文（学術雑誌）, 共著, 査読有り

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Optimal Internal Pricing and Capacity Planning for Service Facility with Finite Buffer

Ushio Sumita, YASUSHI MASUDA , Shigetaka Yamakawa

European Journal of Operational Research Vol.128 （ 6 ） 192-205 2000年06月

研究論文（学術雑誌）, 共著, 査読有り

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Dynamic Pricing for Network Service: Equilibrium and Stability

Yasushi Masuda, Seungjin Whang

Management Science Vol.45 （ 6 ） 857-869 1999年06月

研究論文（学術雑誌）, 共著, 査読有り

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