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)

An optimal procurement policy for items with an inventory level-dependent demand rate and fixed lifetime. - Hark Hwang; Kyu Hun Hahn (Eur. J. Oper. Res., 2000)

Scheduling problem in a two-machine flow line with the N-step prior-job-dependent set-up times. - Ji Ung Sun; Hark Hwang (Int. J. Syst. Sci., 2001)

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

Another similarity coefficient for the p-median model in group technology. - Hark Hwang; Yong Hui Oh (Int. J. Manuf. Technol. Manag., 2003)

The impacts of acceleration/deceleration on travel time models for carousel systems. - Hark Hwang; Youngkeun Song; Kap Hwan Kim (Comput. Ind. Eng., 2004)

Operator-scheduling using a constraint satisfaction technique in port container terminals. - Kap Hwan Kim; Kyeong-Woo Kim; Hark Hwang; Chang Seong Ko (Comput. Ind. Eng., 2004)

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

Foreword. - Hark Hwang; Chiung Moon; Bongju Jeong; Kwangsu Kim (Comput. Ind. Eng., 2006)

A dock-door assignment problem for the Korean mail distribution center. - Yong Hui Oh; Hark Hwang; Chun Nam Cha; Suk Lee (Comput. Ind. Eng., 2006)

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)

Deterministic inventory model for recycling system. - Yong Hui Oh; Hark Hwang (J. Intell. Manuf., 2006)

Development of mathematical models for the container road transportation in Korean trucking industries. - Ki Ho Chung; Chang Seong Ko; Jae Young Shin; Hark Hwang; Kap Hwan Kim (Comput. Ind. Eng., 2007)

A generalized ordering and recovery policy for reusable items. - Dae-Won Choi; Hark Hwang; Shie-Gheun Koh (Eur. J. Oper. Res., 2007)

A genetic algorithm approach to an integrated problem of shelf space design and item allocation. - Hark Hwang; Bum Choi; Grimi Lee (Comput. Ind. Eng., 2009)

An optimal operating policy for the production system with rework. - Ning Liu; Young Joo Kim; Hark Hwang (Comput. Ind. Eng., 2009)

Incremental discount policy of cell-phone carrier with connection success rate constraint. - Young Joo Kim; Hark Hwang (Eur. J. Oper. Res., 2009)

Advanced models and optimization in manufacturing and logistics systems. - Mitsuo Gen; Hark Hwang (J. Intell. Manuf., 2011)

Competition and cooperation in a remanufacturing system with take-back requirement. - Ki Seung Jung; Hark Hwang (J. Intell. Manuf., 2011)

Preface 'Soft computing for management systems'. - Hiroaki Ishii; Shogo Shiode; Hark Hwang; Gwo-Hshiung Tzeng; Hirosato Seki (Comput. Ind. Eng., 2012)

Cost benefits from standardization of the packaging glass bottles. - Young Dae Ko; Injoon Noh; Hark Hwang (Comput. Ind. Eng., 2012)

Retailing policy for perishable item sold from two bins with mixed issuing policy. - Sungjae Han; Yong Hui Oh; Hark Hwang (J. Intell. Manuf., 2012)

A berth allocation planning problem with direct transshipment consideration. - Chengji Liang; Hark Hwang; Mitsuo Gen (J. Intell. Manuf., 2012)

The design of capacitated facility networks for long term care service. - Byung Duk Song; Young Dae Ko; Hark Hwang (Comput. Ind. Eng., 2015)

Location, capacity and capability design of emergency medical centers with multiple emergency diseases. - Young Dae Ko; Byung Duk Song; Hark Hwang (Comput. Ind. Eng., 2016)