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Yuta Saito,Etsuko Kusukawa 대한산업공학회 2018 Industrial Engineeering & Management Systems Vol.17 No.3
This paper discusses risk analysis and supply chain coordination (SCC) for the optimal operation in a supply chain under e-commerce environment (e-SC) with the uncertainties in product demand and customer returns. An e-SC consists of a retailer and a manufacturer. The return handlings are discussed regarding customer returns and unsold products. A retailer receives customer returns from a market once and resells the resalable returns in the same market. A manufacturer buys back the unsold products and the un-resold customer returns from the retailer, considering the difference of quality between them. The mean-variance analysis (MVA) with three risk attitudes regarding the above uncertainties is discussed: risk-neutral attitude maximizing the decision maker’s expected profit in e-SC, risk-averse attitude with negative consideration of variance of the relevant profit, and risk-prone attitude with positive consideration of the variance. Using MVA, the optimal operations for product order quantity, the unit retail price and refund ratio of customer returns under the decentralized e-SC (DSC) and the integrated e-SC (ISC) are determined. The analysis numerically verified that each risk attitude on product demand and customer returns affected the optimal operations under DSC and ISC. SCC adjusting the unit wholesale price and buyback prices between members under ISC can shift to ISC.
Saito, Yuta,Kusukawa, Etsuko Korean Institute of Industrial Engineers 2015 Industrial Engineeering & Management Systems Vol.14 No.2
A correct information of customer returns ratio under e-commerce is not always shared between supply chain (SC) members. Also, it is important issue for SC members to handle the unsold products in a market. This paper discusses the impact of information sharing of customer returns ratio on an optimal sales strategy including resale of customer returns and buyback policy for a SC under e-commerce with a manufacturer and a retailer. A retailer sells a single product and resells the resalable customer returns in the same market. A manufacturer produces the products and buys back the unsold products as to their quality from the retailer. The integrated SC (ISC) determines the optimal product order quantity to maximize the expected profit of the whole SC. The decentralized SC (DSC) makes the optimal decisions for order quantity and the wholesale price of products to maximize the expected profit of each SC member. The effect of information sharing is discussed between SC members under ISC and DSC. The analysis numerically investigates how information sharing of the returns ratio affects the optimal decision and the expected profits under ISC and DSC. Besides, effect of SC coordination to encourage the shift to ISC is discussed.
Yuta Saito,Etsuko Kusukawa 대한산업공학회 2015 Industrial Engineeering & Management Systems Vol.14 No.2
A correct information of customer returns ratio under e-commerce is not always shared between supply chain (SC) members. Also, it is important issue for SC members to handle the unsold products in a market. This paper discusses the impact of information sharing of customer returns ratio on an optimal sales strategy including resale of customer returns and buyback policy for a SC under e-commerce with a manufacturer and a retailer. A retailer sells a single product and resells the resalable customer returns in the same market. A manufacturer produces the products and buys back the unsold products as to their quality from the retailer. The integrated SC (ISC) determines the optimal product order quantity to maximize the expected profit of the whole SC. The decentralized SC (DSC) makes the optimal decisions for order quantity and the wholesale price of products to maximize the expected profit of each SC member. The effect of information sharing is discussed between SC members under ISC and DSC. The analysis numerically investigates how information sharing of the returns ratio affects the optimal decision and the expected profits under ISC and DSC. Besides, effect of SC coordination to encourage the shift to ISC is discussed.
이정민,송윤흡,Yuta Saito,Yuji Sutou,Junichi Koike 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.9
A selective switching device utilizing a phase-change material was investigated. In this work, we present a new concept to realize serially a selective switching and memory operation in a multiple phase-change memory with only phase-change materials without any semiconductor switching device. A phase-change material for selective switching can be expected to have a higher resistance amorphous phase and to show lower melting and crystallization temperatures than a phase-change material for a memory. Here, we present a structural method to obtain the above requirements. In addition, we confirm the switching operation by a selective current pulse for multiple phase-change materials from the experiment. From these results, we expected that one of the multiple phasechange materials can be replaced in a switching device without the need for an additional selective device, and that such a device would be feasible for 3-dimensional PCM architecture.