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Papers by Elisa Gebennini

In the modern competitive business environment, the design and management of supply chains is one... more In the modern competitive business environment, the design and management of supply chains is one of the most important and critical problems facing managers of multinational companies operating worldwide. There are three levels of decisions in a supply chain: strategic, tactical, and operational levels. The literature generally treats these decisions separately. This study defines a conceptual framework for the development of new modeling approaches for the Production Distribution Logistic System Design (PDSD) problem. In particular, the authors introduce the initial basis for the development of an innovative decision support systems platform capable of integrating the design, management, control, and optimization activities for a supply chain system.

IIE Transactions, 2014

The paper deals with the analytical modeling of transfer lines made up of two machines decoupled ... more The paper deals with the analytical modeling of transfer lines made up of two machines decoupled by one finite buffer. The innovative contribution of this work consists in representing a particular behavior that can be found in a number of industrial applications, such as in ceramic and electronic industries. Specifically, the buffer significantly affects the line performance as, when it is accumulating or releasing material (i.e., when one machine is operational and the other machine is under repair), it forces the operational machine to slow down. Conversely, when both machines are operational they can work at an higher capacity since the buffer is bypassed. Thus, two levels for the machine capacity can be identified, according to the conditions of the machines and, consequently, to the state of the buffer.

International Journal of Production Economics, 2014

The paper deals with emerging automation technologies for pallet handling in warehouses character... more The paper deals with emerging automation technologies for pallet handling in warehouses characterised by multiple-depth rack storage systems. In particular, this study addresses the adoption of Pallet Shuttles (PSs) for material handling within the rack structure, i.e., for put-away and retrieval operations from the rack face to the specific pallet location and vice versa. PSs are used in combination with Laser Guided Vehicles (LGVs) so as to obtain a fully automated warehousing system.

2008 American Control Conference, 2008

The problem of deriving a probabilistic mathematical model of an industrial production line is ad... more The problem of deriving a probabilistic mathematical model of an industrial production line is addressed in this paper. In particular, the analysis of a Tetra Pak liquid foodstuff packaging line has been developed as application of the modeling theory. Tetra Pak's package forming machine works on the basis of a continuous process which cannot be interrupted without production wasting. Production buffer are used to decouple package forming machine with following (downstream) machines (e.g. straw applicator, film wrapper, etc.) to avoid forming machine forced stoppage because downstream machine stoppage. The paper presents a new analytical approach for the packaging forming machine restart control policy based on buffer level.

Waste Management, 2009

The content of hazardous components in Waste arising from Electrical and Electronic Equipment (WE... more The content of hazardous components in Waste arising from Electrical and Electronic Equipment (WEEE) is a major concern that urges governments and industry to take measures to ensure proper treatment and disposal. Thus, the European Union issued directives to encourage reuse, recycling and other proper forms of recovery of such waste while companies and academics are still studying methods and technologies for optimizing recovery processes. This paper presents an analysis of the logistics process assuring the correct collection, handling, transportation and storing of WEEE. The experience comes from an Italian WEEE treatment plant (TRED Carpi S.r.l.) where a new kind of container has been introduced in order to improve the logistics system. An evaluation framework is described and used in order to compare different system configurations and assess the advantages emerging from adopting proper equipments for WEEE transport and handling.

International Journal of Production Research, 2009

Assembly line re-balancing is a problem frequently tackled by companies, as continuous changes in... more Assembly line re-balancing is a problem frequently tackled by companies, as continuous changes in product features and volume demand caused by the volatility of today's markets produce assembly tasks redefinition and line cycle time fluctuations. Hence, managers have to adapt the balancing of their lines to accomplish with the new conditions, while trying to keep to a bare minimum increases in completion costs and in costs related to changes in tasks assignment. In particular, modifications in line balancing impact on operators training, equipment switching and moving, along with quality assurance. The stochastic assembly line re-balancing problem basically consists in a multi-objective problem where two objectives, total expected completion cost of the new line and similarity between the new and the existing line, have to be jointly optimized. In this paper, a multiple single-pass heuristic algorithm is consequently developed with the aim to find the most complete set of dominant solutions representing the Pareto front of the problem. Multiple single-pass procedures iterate the execution of single-pass algorithms, in order to generate a set of solutions, rather than to create a unique purpose. Given such a set, the best-performing solutions, in accordance with the multi-objective nature of the problem, are presented to the line designer, who selects the final assembly line balancing considering also additive factors that can be hardly inserted in a mathematical approach (i.e. simplicity of learning re-assigned tasks, time requested for the re-allocation of tools necessary for executing re-assigned tasks, experience requested for maintenance of tools necessary for executing re-assigned tasks). By means of a wide experimentation including comparisons with a multiobjective genetic algorithm, the behaviour of the proposed methodology is set and optimized.

International Journal of Production Economics, 2009

The design and management of a multi-stage production-distribution system is one of the most crit... more The design and management of a multi-stage production-distribution system is one of the most critical problems in logistics and in facility management. Companies need to be able to evaluate and design different configurations for their logistic networks as quickly as possible. This means coordinating the entire supply chain effectively in order to minimize costs and simultaneously optimize facilities location, the allocation of customer demand to production/distribution centers, the inbound and outbound transportation activities, the product flows between production and/or warehousing facilities, the reverse logistics activities, etc.

Annals of Operations Research, 2013

This paper deals with the performance evaluation of production lines in which well defined machin... more This paper deals with the performance evaluation of production lines in which well defined machine start/stop control policies are applied.

Proceedings 2007 IEEE International Conference on Robotics and Automation, 2007

I. INTRODUCTION In recent years increasing competition in global markets has pushed industries to... more I. INTRODUCTION In recent years increasing competition in global markets has pushed industries to adopt innovative production systems, targeting improved production quality at reduced cost. In par-ticular high volume production, demands a highly automation and ...