Sawik, Tadeusz
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Item type:Article, Access status: Open Access , Mixed integer programming approaches to planning and scheduling in electronics supply chains(AGH University of Science and Technology Press, 2017) Sawik, TadeuszThis paper discusses mixed-integer programming (MIP) approaches to planning and scheduling in electronics supply chains. First, the short-term detailed scheduling of wafer fabrication in semiconductor manufacturing and detailed scheduling of printed wiring board assembly in surface mount technology lines are discussed. Then, the medium-term aggregate production planning in a production/assembly facility of a consumer electronics supply chain is described, and finally, the coordinated aggregate planning and scheduling of the manufacturing and supply of parts and production of the finished products is presented. The decision variables are defined, and the MIP modeling frameworks are provided. Two decisionmaking approaches are discussed and compared: an integrated (simultaneous) approach, in which all required decisions are made simultaneously using a complex, large monolithic MIP model, and a hierarchical (sequential) approach, in which the required decisions are made successively using the hierarchies of simpler and smaller-sized MIP models. The paper also highlights the research on stochastic MIP applications to the planning and scheduling in electronics supply chains with disrupted material and information flows due to natural or man-made disasters.Item type:Article, Access status: Open Access , A bi-objective mixed integer program for supplier selection(Wydawnictwa AGH, 2009) Sawik, TadeuszThe problem of allocation of orders for custom parts among suppliers in make to order manufacturing is formulated as a bi-objective mixed integer program. Given a set of customer orders for products, the decision maker needs to decide from which supplier to purchase custom parts required for each customer order. The selection of suppliers is based on price and quality of purchased parts and reliability of on time delivery. Numerical examples are presented and some computational results are reported.Item type:Article, Access status: Open Access , A multi-objective assignment of customer orders to planning periods in make-to-order manufacturing(Wydawnictwa AGH, 2005) Sawik, TadeuszW pracy przedstawiono modele programowania całkowitoliczbowego do wielokryterialnej optymalizacji długoterminowych harmonogramów produkcji wytwarzanej na zamówienie w elastycznym systemie montażowym. System składa się z szeregowo połączonych gniazd montażowych, zaś każde gniazdo obejmuje jedną lub kilka maszyn, pracujących równolegle. Podstawowym celem harmonogramowania jest przydział zleceń do okresów planowania tak, aby zminimalizować liczbę zleceń wykonanych po terminie dostawy do odbiorcy. Ponadto należy ograniczyć liczbę zleceń wykonanych przed terminem dostawy oraz zrównoważyć wykorzystanie zasobów w kolejnych okresach planowania. Zastosowano i porównano dwa podejścia: monolityczne i leksykograficzne. Przykłady liczbowe zaczerpnięte z przemysłu elektronicznego oraz wyniki eksperymentów obliczeniowych ilustrują zastosowanie proponowanych podejść.Item type:Article, Access status: Open Access , Integrated scheduling in a customer driven supply chain(Wydawnictwa AGH, 2007) Sawik, TadeuszA mixed integer programming approach is proposed for a longterm, integrated scheduling of material manufacturing, material supply and product assembly in a customer driven supply chain. The supply chain consists of three distinct stages: manufacturer/supplier of product-specific parts, producer where finished products are assembled according to customer orders and a set of customers which generates final demand for the products. The overall problem is how to coordinate manufacturing and supply of parts and assembly of products such that the total supply chain inventory, manufacturing start-ups and parts shipping costs are minimized. Numerical examples modeled after a real-world integrated scheduling in a customer driven supply chain of high-tech products are presented and some computational results are reported.