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This paper proposes a new inventory control technique for dual-channel supply chains. In dual-channel supply chains, both a retail channel and a direct channel via a website exist. In previous studies, Takahashi et al. (2011) proposed a new inventory control technique for dual-channel supply chains by using a switching point that starts and stops for production and delivery. However, using a linear function for switching, reductions in inventory cost and lost sales costs can be expected. Therefore, in this paper, the authors propose an inventory control method using linear functions for dual-supply chains and and prove its effectiveness using numerical experiments and comparing results with those of a previous study conducted by Takahashi et al. (2011). [ABSTRACT FROM AUTHOR]

In this paper, we conduct a case study of a company that collects and processes used home appliances and sells them as new recycled resources based on the Home Appliance Recycling Law. The target company earns sales by selling multiple resources to multiple sales destinations with different selling prices. There are various restrictions on such sales, which creates complexity. Due to this complexity, the sales amount cannot be maximized using only the intuition and experience of employees. Therefore, we propose a model that maximizes the sales amount obtained from selling each resource. As a result, using the proposed model, different sales amounts and sales destinations of each resource were obtained, achieving better results. Specifically, compared to the current total sales amount, 3.6% better results are expected. Furthermore, as a sensitivity analysis, experiments were conducted in which the credit constraints of each sales destination were varied. It was found that risk management can be performed without affecting the objective function value by setting credit appropriately. [ABSTRACT FROM AUTHOR]