Simulation Analysis of a VMI Hub with Production Information from Manufacturers

[[abstract]]企業體認到不再是從設計、製造到銷售都由自己負責的經營模式，唯有與其他企業形成合作夥伴關係，專注於其核心競爭力事業將非核心競爭力事業外包，才能達到雙贏的局面。國內零售業HUB的運作方式為透過零售商提供POS資訊給供應商，達到提昇供貨水準、降低庫存量以及提昇企業之間的夥伴關係。然而在製造業中雖然製造商與上游供應商在需求端有使用需求預測或生產計劃資訊，卻未善加利用於庫存管理上，供應商以固定的再訂購點與補貨量來管理HUB的存貨，以至於HUB未能發揮最大效益。 本研究探討供應商根據製造商的生產計畫與外部顧客需求預測資訊，動態的調整HUB中庫存的補貨數量與再訂購點。應用系統模擬軟體，模擬實際企業內部需求無淡旺季變化與具有淡旺季變化之運作情形，以雙目標最佳化探討兩個面向，庫存量之於供貨水準面以及成本之於供貨水準面，並以柏拉圖曲線分析HUB於庫存管理上，應用製造商需求資訊與外部顧客需求預測資訊的協同模式的效益。 實驗結果證實，在需求具有淡旺季起伏時，供應商以協同模式管理HUB的庫存，達到減少整體庫存水準、降低庫存成本同時又能提升供貨水準之目標，從而提昇製造業者與供應商之間的協同合作關係。[[abstract]]Enterprises now recognize that forming a collaborative partnership with suppliers or customers may lead to long term advantages Many domestic retailers provide POS information to their suppliers achieving higher fill rate lower inventory and closer partnership However upstream manufacturers and suppliers do not apply demand forecasting or production plan extensively on the supply side especially in terms of inventory control In our study we try to investigate how the suppliers can utilize the manufacturer's production plan and external customer demand forecasts to dynamically adjust the hub’s inventory replenishment quantity and reorder point We simulated the actual operating conditions with seasonal and non-seasonal demands We then estimate Pareto fronts to analyze the benefit of controlling the Hub’s inventory with manufacturer's production plans and external customer demand forecasts The results suggest that the collaboration model can improve fill rate reduce inventory and enhance partnership significantl