Wyniki wyszukiwania - BazTech

1

Maintenance Optimization for Transport Vehicles in a Supply Chain

Rezg N., Dellagi S., Hajej Z.

Logistics and Transport

|

2014

|

Vol. 24, No. 4

7--14

EN

In this paper, we are interested in determining a maintenance policy with an optimal cost to enable the company to generate significant profits, often the means of transport travelled different paths, they are characterized by the distance they covered; however each distance has an effect on the operating characteristics of means of delivery. The objective of this paper is twofold: It aims both to introduce the model of supply chain and specify distances, and codify the use of it in the proportional hazard model, later a maintenance policy was presented which takes into consideration the types of paths travelled by the means of delivery.

2

Transportation needs of entrepreneurs in Wroclaw agglomeration - study results

Yedes Y., Chelbi A., Rezg N.

Logistics and Transport

|

2011

|

Vol. 12, No. 1

89-100

EN

This paper deals with the integrated supply chain management problem in the context of a single vendor-single buyer system for which the production unit is assumed to randomly shift from an in-control to an out-of-control state. Two different strategies, integrating production, shipment and maintenance policies, are proposed and compared to satisfy the buyers order at a minimum integrated total cost rate. The first strategy is based on a classical production policy for which the buyer's order of size nQ is manufactured continuously and shipped by lots of size Q. The second strategy suggests that the same buyer's order should be produced and shipped separately by equal sized lots Q. For both strate- gies, a corrective or preventive maintenance action is performed at the end of each production cycle, depending on the state of the production unit, and a new setup is carried out. The total integrated average cost per time unit is consid- ered as the performance criterion allowing choosing the best policy for any given situation.

3

Deadlock freeness supervisor for marked graph

Sioud H., Achour Z., Sava A., Rezg N.

Bulletin of the Polish Academy of Sciences. Technical Sciences

|

2009

|

Vol. 57, nr 3

281-289

EN

This note presents a control synthesis approach for discrete event systems modeled by marked graphs with uncontrollable transitions. The forbidden behavior is specified by General Mutual Exclusion Constraints (GMEC). We prove that, even if the system to be controlled .s live, the closed loop control may generate deadlock situations. Using the structural proprieties of marked graph we defined the causes of deadlock situations, and we defined a formal method to avoid them.