Tesis doctoral de José Miguel Lainez Aguirre
Market trends have made enterprises change the way of doing business. Globalization makes accessible a wide range of globally dispersed potential suppliers and customers. For competitive customer service now the market demands environmentally friendly products, rapid development of new products, high quality and reliability, among others. In order to fulfill such requirements firms depend more and more on their supply chains (sc). indeed, nowadays competition is not longer among individual firms, but among scs. The process system engineering community has been conscious of this shift and has thus devoted research efforts on devising sc and enterprise-wide modeling and optimization strategies. Likewise, from another stand point, the european chemical industry has realized the necessity of sc improvement in order to remain competitive in the global market. supply chain management (scm) is intended to maximize financial returns by synchronizing material, cash and information flows across interconnected entities that seek to provide products to consumers. Lately, it has been recognized the necessity for integrated scm solutions which incorporate and synchronize decisions from several business functions and different hierarchical levels. Current changing and uncertain market environment and internal business concerns make it even more difficult to synchronize all the sc activities. Hence, it would be desirable that sc objectives and plans were developed considering market and internal operations uncertainty explicitly, revised periodically and eventually modified following the uncertainty disclosure. the aim of this thesis is to contribute to the centralized integrated scm. The centralized approach to scm considers that there exists a central entity that it is able to control the activities of the whole business. after an overview of scm and analysis of existing approaches, the second part of this thesis is focused on the development of models which consider the variety of business functionalities. This part explores how business performance can be improved by integrating strategic scm with financial, marketing and product development planning. The following section is devoted to topics related to pure strategic and tactical sc operations. It is investigated how a more appropriate representation of production processes can be achieved at the sc level. This part is also concerned with the environmentally conscious design of scs. the fourth part is focused on uncertainty considerations. A model predictive control whose control algorithm is a stochastic formulation is proposed to face uncertainty and dynamics in scm. Here, it is shown how incidences can be better resolved by approaching them from a sc perspective. This part also presents a novel graph based approach to deal with scheduling under exogenous uncertainty. The s-graph framework is enhanced to address a two stage stochastic scheduling considering demand as uncertain. One of the advantages of this approach is that the search space does not increase with the number of considered scenarios. Such a feature reduces the computational cost required to solve this kind of problems which is one of the major challenges in this field, thus constituting a robust alternative to existing schedulers to become eventually the best option in integrated scm. the last contribution concerns the integration of hierarchical decision levels. The fifth part examines the implications of considering scheduling decisions when designing a sc network. It is shown how capacity is the core factor that allows the integration of hierarchical levels. This part emphasizes that an optimistic performance, due to capacity overestimation, is obtained if scheduling is not consider into the sc design formulation. Moreover, it is demonstrated how capacity permits low level supervisory control integration. Such integration allows updating sc capacity and adequately resolving equipment disruptions or breakdowns.
Datos académicos de la tesis doctoral «Towards integrated management of the supply chain for enterprise sustainability«
- Título de la tesis: Towards integrated management of the supply chain for enterprise sustainability
- Autor: José Miguel Lainez Aguirre
- Universidad: Politécnica de catalunya
- Fecha de lectura de la tesis: 15/01/2010
Dirección y tribunal
- Director de la tesis
- Luis Puijaner Corbella
- Tribunal
- Presidente del tribunal: gintaras v. Reklaitis
- albert Corominas subias (vocal)
- Santiago Esplugas vidal (vocal)
- José Antonio Caballero suárez (vocal)
