An EOQ model with quantity discounts for both purchasing price and freight cost. - Hark Hwang; Dug Hee Moon; Seong Whan Shinn (Comput. Oper. Res., 1990)

Retailer's pricing and lot sizing policy for exponentially deteriorating products under the condition of permissible delay in payments. - Hark Hwang; Seong Whan Shinn (Comput. Oper. Res., 1997)

Optimal pricing and ordering policies for retailers under order-size-dependent delay in payments. - Seong Whan Shinn; Hark Hwang (Comput. Oper. Res., 2003)

A returns policy for distribution channel coordination of perishable items. - Kyu Hun Hahn; Hark Hwang; Seong Whan Shinn (Eur. J. Oper. Res., 2004)

Network model and effective evolutionary approach for AGV dispatching in manufacturing system. - Lin Lin 008; Seong Whan Shinn; Mitsuo Gen; Hark Hwang (J. Intell. Manuf., 2006)