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1,104 results on '"Ryu, Kwang"'

247. Effects of Fe2O3 doping on structural and electrical properties of 8 mol% yttria-stabilized zirconia electrolyte for solid oxide fuel cells.

Author

Jeon, Ok Sung, Park, Myeong Geun, Song, Rak Hyun, Ryu, Kwang Hyun, Na, Chan Woong, Shul, Yong Gun, and Lee, Jin Goo

Subjects
YTTRIA stabilized zirconium oxide, SOLID electrolytes, SOLID oxide fuel cells, IONIC conductivity, ZIRCONIUM oxide, POWER density
Abstract

The effects of doping a trace of Fe2O3 on the structural and electrical properties of 8 mol% yttria-stabilized zirconia (8YSZ) are investigated. The 8YSZ electrolytes doped with various Fe2O3 contents are applied to a solid oxide fuel cell to confirm whether it is positive or negative for SOFC performances. In this study, the 8YSZ electrolyte with a trace of Fe2O3 shows the increased oxygen vacancies and better ionic conductivity. The optimum Fe2O3 doping content is 500 ppm at a sintering temperature of 1400 °C. The 8YSZ electrolyte doped with 500 ppm Fe2O3 shows 0.122 S cm−1 and 0.598 W cm−2 at 800 °C in the ionic conductivity and maximum power density, respectively. The power density of the cell based on the 8YSZ electrolyte doped with 500 ppm Fe2O3 is about 1.5 times higher than the cell using the pristine 8YSZ electrolyte. Thus, the introduction of a trace of Fe2O3 to the 8YSZ can improve its structural and electrical properties and finally SOFC performances. [ABSTRACT FROM AUTHOR]

Published
2022
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250. Channel coordination for multi-stage supply chains with revenue-sharing contracts under budget constraints.

Author

Moon, Ilkyeong, Feng, Xue-Hao, and Ryu, Kwang-Yeol

Subjects
REVENUE sharing (Corporations), SUPPLY chains, SUPPLY chain management, CORPORATE profits, BUSINESS revenue, BUSINESS partnerships
Abstract

Real-life situations show that revenue-sharing (RS) contracts used in multi-stage supply chains have more complex structures than those that have been studied in recent research. In this paper, we study RS contracts in multi-stage supply chains where some members work with more than one upstream member. This general supply chain structure closely resembles those in actual practice under RS contracts. The literature on supply chain contracts has not adequately addressed contract design for supply chains with members who face budget constraints. We show that the RS contract could fail to coordinate supply chains when members are under particular budget constraints. In response, we propose a revenue-sharing with budget constraints (RSB) contract that adds no administrative cost. A properly designed RSB contract can be used to achieve supply chain coordination and to arbitrarily allocate profits in multi-stage supply chains. Our numerical results provide insights into ways supply chain coordination can be achieved under budget constraints through the RSB contract. [ABSTRACT FROM PUBLISHER]

Published
2015
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