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Methods of planning deliveries of food products to a trade network with the selection of suppliers and transport companies

Magiera M.

Archives of Control Sciences

2018

Vol. 28, No. 3

419--442

The paper refers to planning deliveries of food products (especially those available in certain seasons) to the recipients: supermarket networks. The paper presents two approaches to solving problems of simultaneous selection of suppliers and transportation modes and construction of product flow schedules with these transportation modes. Linear mathematical models have been built for the presented solution approaches. The cost criterion has been taken into consideration in them. The following costs have been taken into account: purchase of products by individual recipients, transport services, storing of products supplied before the planned deadlines and penalties for delays in supply of products. Two solution approaches (used for transportation planning and selection of suppliers and selection of transportation modes) have been compared. The monolithic approach calls for simultaneous solutions for the problems of supplier selection and selection of transportation modes. In the alternative (hierarchical) solution approach, suppliers are selected first, and then transportation companies and their relevant transportation modes are selected. The results of computational experiments are used for comparison of the hierarchical and monolithic solution approaches.

Comparative analysis of two hierarchical methods of assembly planning for producers of electric and electronic equipment

Magiera M.

Przegląd Elektrotechniczny

2015

R. 91, nr 4

86--90

Porównano dwie dwupoziomowe metody planowania montażu, przeznaczone dla producentów sprzętu elektrycznego i elektronicznego. Zbudowano je dla elastycznych linii montażowych z maszynami równoległymi. Na górnym poziomie opracowanych metod rozwiązywane jest zadanie równoważenia obciążeń maszyn (w metodzie I) lub równoważenia obciążeń stadiów (w metodzie II). Równocześnie dla każdego produktu wybierana jest jedna sekwencja montażowa. Na dolnym poziomie szeregowane są operacje montażowe. Przedstawiono wyniki eksperymentów obliczeniowych.

The two two-level methods of assembly planning for producers of electric and electronic equipment are compared. The methods are constructed for flexible assembly lines with parallel machines. At the upper level of the prepared methods, a task is solved for balancing machine workload (in the method I) or a task for balancing assembly stages workload (in the method II). Simultaneously, only one assembly plan is selected for each product type. At the lower level, assembly tasks are scheduling. The results of calculation experiments are presented.