Publicada By  jpgarcia - complexity theory, Corsari    

 This paper addresses a mixed integer linear programming model for operations lot-sizing
and scheduling (assignment and sequencing) in the supply network of a European company which 
assembles customized machine tools through several geographically distributed factories and delivers 
them to the customers’ factory. The results from the model propose a schedule to purchase raw 
material from different suppliers to the various  factories considered, lateral stock transshipments, 
shipments to customers and various operations required for product assembly. Different alternative 
operations (product substitution, alternative procurement and transport operations), considering lead 
times, are contemplated. Specific constraints, such  as space availability in each plant and the two 
backlog types, are considered. A novel approach based on the stroke concept is applied to the MILP 
model to consider alternatives. Since the latest MILP optimizers are not always available, a specific 
procedure to solve the case study based on the graph theory is proposed. Moreover, thanks to this 
concept, the algorithm proposed determines all the feasible solution
21 marzo, 2012

Publicada By  jpgarcia - artículos y trabajos publicados, Corsari    

This paper presents an algorithm to define the optimal parameters for deliberated and controlled coproduction in an economic lot scheduling problem setting (DCCELSP). Coproduction is said to be deliberated and controlled because it is possible to decide whether or not to coproduce when all the parameters associated with the process are known. The aim is to determine how to produce two products most economically where deliberated coproduction is an option. For this purpose, a procedure for defining optimal lot periods is introduced. Two models are proposed for this procedure and a numerical illustration is provided to gain insight into their dynamics. The cost advantages of coproduction were found to depend on the relationship between setup and holding costs, production rates, and demand for products. The more similar these system parameters are and the higher the machine usage ratio is, the more favourable coproduction is. Additionally, if coproduction is not deliberated appropriately, costs soar.

Economic lot scheduling with deliberated and controlled coproduction European Journal of Operational Research, Volume 219, Issue 2, 1 June 2012, Pages 396-404

  • Pilar.I. Vidal-CarrerasaCorresponding author contact informationE-mail the corresponding author,
  • Jose P. Garcia-Sabatera,
  • Jairo R. Coronado-Hernandezb

en una revista que no crecerá mucho porque es una de las clásicas

European Journal of Operational Research

9 enero, 2012

Universidad Politécnica de Valencia