...According search, just Chiu and Chen [1, 3-5] developed lot-sizing models with discrete time varying demand and learning and forgetting effects in the literature. But there is a drawback in the developed extended WWA algorithm to obtain an optimal solution in [1] because of learning curve structure.

A NEW SOLUTION ALGORITHM

According to Eq. (4) on page 208 of the related paper [1], the cost of first unit of an order at period j depends on the cost of first unit and the size of last order prior to period j. It seems that the authors assume the sum of all demands of periods 1 to j - 1 (j > 2) are...

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