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Joint effect of forecasting and lot-sizing method on cost minimization objective of a manufacturer: a case study

Olesen Jack, Pedersen Carl-Emil Houmøller, Knudsen Markus Germann, Toft Sandra, Nedbailo Vladimir, Prisak Johan, Nielsen Izabela Ewa, Saha Subrata

Applied Computer Science

2020

Vol. 16, no 4

21--36

Forecasting and lot-sizing problems are key for a variety of products manufactured in a plant of finite capacity. The plant manager needs to put special emphasis on the way of selecting the right forecasting methods with a higher level of accuracy and to conduct procurement planning based on specific lot-sizing methods and associated rolling horizon. The study is con-ducted using real case data form the Fibertex Personal Care, and has evalu-ated the joint influence of forecasting procedures such as ARIMA, exponen-tial smoothing methods; and deterministic lot-sizing methods such as the Wagner-Whitin method, modified Silver-Meal heuristic to draw insights on the effect of the appropriate method selection on minimization of operational cost. The objective is to explore their joint effect on the cost minimization goal. It is found that a proficient selection process has a considerable impact on performance. The proposed method can help a manager to save substantial operational costs.

Efektywność skali w gospodarstwach o zmechanizowanym procesie pracy

Sawa J.

Inżynieria Rolnicza

2009

R. 13, nr 8

175-181

W pracy określono efektywność skali produkcji rolniczej w 42 gospodarstwach, które zestawiono w grupy wg wielkości obszarowej [ha UR] oraz obsady zwierząt [DJP*100 ha-1UR]. Gospodarstwa dysponujące powierzchnią przynajmniej 100 ha UR i obsadą zwierząt około 40 DJP*100 ha-1 UR oraz gospodarstwa prowadzące dział produkcji zwierzęcej, przy obsadzie powyżej 140 DJP*100 ha-1 UR i użytkujące powyżej 35 ha UR dysponują parytetową wielkością gospodarstw.

The research allowed to determine agricultural production scale effectiveness in 42 farms, which were grouped according to their area size (ha of arable land) and animal stock (DJP [large conversion unit]*100 ha-1 of arable land). Those farms have parity farm size, which possess the area of minimum 100 ha of arable land and animal stock of approximately 40 DJP*100 ha-1 of arable land, and have animal production department possessing stock exceeding 140 DJP*100 ha-1 of arable land and using more than 35 ha of arable land.