Authors: None

Abstract:

Keywords:

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.90001

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: ---

Authors: Chaieb Memmi, Imen; Abbassi, Besma

Abstract: In this paper, we address the problem of allocating a set of tasks to a set of operators, in labor intensive work environments such as manufacturing of clothing, in order to maximize the performance of the underlying production system. First, we modelize the problem as a mixed integer problem by adopting the point of view of the company through a multi-criteria approach. Two objectives are considered: minimizing the total production time and maximizing the quality of products. A critical analysis of the results shows an imbalance in the workload distribution among operators. This analysis led us to propose an approach which takes into account the workload balancing among operators. We study two types of balancing: (1) balancing in terms of temporal loads and (2) balancing in terms of assigned tasks’ number. The result is an integrated model allowing decision makers to find the best compromise between the company’s total performance in terms of production time and quality, and the interest of operators in terms of workload. This integrated model was developed and implemented as a decision-making tool that helps companies to make decisions about training of operators.

Keywords: Manufacturing Production; Production Control, Control Systems; Optimisation Methods and Simulation Tools

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00002

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 1-8

Authors: Ning, Ke; Scholze, Sebastian; Marques, Maria; Campos, Ana Rita; Neves-Silva, Rui; O'Sullivan, David

Abstract: The understanding and applying of knowledge can be difficult if it is isolated from the context under which the knowledge is generated and managed. Despite the importance of contextual information, there has been limited support for utilizing context in existing knowledge management solutions. This paper presents a set of integrated services for context aware enhancing of knowledge and knowledge management: monitoring services monitor human computer interaction to implicitly capture their interactions with the explicit or implicit data; context extraction services extract activity centric knowledge context from the monitoring data, as well as support users to manage their knowledge-based activities; knowledge enhancing services enhance knowledge and knowledge management by taking into consideration the context and topic of the knowledge-based activity. The services are provided in a loosely coupled service oriented framework which can be easily integrated with existing information and knowledge management systems to maximize its usability and extendibility.

Keywords: Industrial Applications of Intelligent Systems; Computer Supported Cooperative Work; Ubiquitous Computing

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00003

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 9-15

Authors: Tarau, Alina; De Schutter, Bart; Hellendoorn, Hans

Abstract: State-of-the-art baggage handling systems transport luggage in an automated way using destination coded vehicles (DCVs). These vehicles transport the bags at high speeds on a network of tracks. In this paper we consider the problem of controlling the route of each DCV in the system. In general this results in a nonlinear, nonconvex, mixed integer optimization problem which is usually very expensive in terms of computational effort. Therefore, we present an alternative approach for reducing the complexity of the computations by simplifying and approximating the nonlinear optimization problem by a mixed integer linear programming (MILP) problem. The advantage is that for MILP problems solvers are available that allow us to efficiently compute the global optimal solution. The solution of the MILP problem can then be used as a good initial starting point for the original nonlinear optimization problem. We use model predictive control (MPC) for solving the route choice problem. We also assess the performance of the proposed (nonlinear and MILP) formulations of the MPC optimization problem using a benchmark case study.

Keywords: Hierarchical, Distributed Network and Multiagent System Organisations; Real-Time Decision and Control Algorithms

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00004

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 16-21

Authors: Chetouane, Fatah; Collart Dutilleul, Simon

Abstract: This research focuses on the planning of an Alpine skiing lift network in the Mount Carleton Provincial Park, located north of New Brunswick in Atlantic Canada. Linear programming LP and discrete event simulation are used to model ski lifts network and evaluate several ski lifts selection alternatives based on technological specification, network layout, valley development plan, and service quality standards. A good solution is found by using LP optimisation for chair lifts selection and discrete event simulation to evaluate skier lift waiting times and slopes usage rate, as a measure of service quality and compliance level with environmental constraints in the Provincial Park.

Keywords: Optimisation Methods and Simulation Tools; Transport and Services; Discrete-Event, Hybrid and Continuous Systems

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00006

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 22-27

Authors: Tometzki, Thomas; Neymann, Tobias Claus; Steimel, Jochen; Subbiah, Subanatarajan; Engell, Sebastian

Abstract: This contribution reports on an optimization framework for the formulation and the solution of batch scheduling problems. The problems are graphically modeled as extended resource task networks (eRTN). The extended resource task networks are automatically translated to timed automata (TA) and are composed by parallel composition to form a global automaton that represents the complete scheduling problem. An efficient cost-optimal reachability analysis is performed on the global automaton to derive the schedules. The schedules are presented graphically as Gantt-charts to the user and can be revised when required. The main advantage of this approach over standard mathematical programming techniques is the intuitive graphical and modular modeling and the ability to compute solutions within reasonable periods of time. The proposed framework is tested on a scheduling problem in a pipeless plant to demonstrate a successful application.

Keywords: Production Control, Control Systems; Optimisation Methods and Simulation Tools; Manufacturing Production

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00007

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 28-33

Authors: Duarte, António Jorge S. T.; Valério de Carvalho, José Manuel

Abstract: This work presents an algorithm for solving exactly a scheduling problem with identical parallel machines and malleable tasks, subject to arbitrary release dates and due dates. The objective is to minimize a function of late work and setup costs. A task is malleable if we can freely change the set of machines assigned to its processing over the time horizon. We present an integer programming model, a Dantzig-Wolfe decomposition reformulation and its solution by column generation. We also developed an equivalent network flow model, used for the branching phase. Finally, we carried out extensive computational tests to verify the algorithm’s efficiency and to determine the model’s sensitivity to instance size parameters: the number of machines, the number of tasks and the size of the planning horizon.

Keywords: Optimisation Methods and Simulation Tools

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00010

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 34-39

Authors: M'Halla, Anis

Abstract: This paper deals with the robustness of a milk manufacturing workshop including time interval constraints. In such systems operation times are included between a minimum and a maximum value. Weighted Marked Graphs are used for modeling. We recall some results proposing to transform Weighted Marked Graphs into Marked Graphs, in order to obtain a model, which can be used to apply some robustness results on a milk manufacturing unit. In the last part, a computing algorithm, of a lower bound of the maximal time disturbances allowed in a given point of the milk manufacturing workshop, is applied. The industrial example shows how results of P-time Model Graph can be extended to Weighted Marked Graphs.

Keywords: Production Control, Control Systems

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00011

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 40-46

Authors: Wieczorek, Dorothee; Künne, Bernd

Abstract: Currently the focus of planning and designing intralogistic systems lies on the technical quality rating in the form of maximum fulfilment of the mechanical requirements. This compliancy is often achieved by oversizing the mechanical components. A re-orientation in designing such systems is especially necessary because of the multitude of electrically-driven components. The current guidelines for embodiment design for intralogistic systems are not sufficient to optimise such plants regarding their service conditions. That is why adapted statistical models have been developed with the help of DoE based on measurands. These models conduce to generate new guidelines for embodiment design for such plants.

Keywords: Optimisation Methods and Simulation Tools; Discrete-Event, Hybrid and Continuous Systems

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00012

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 47-51

Authors: Filcek, Grzegorz

Abstract: The paper deals with a supply network that consists of three interconnected subsystems: raw material warehouses, production units and product warehouses. The allocation of a raw material among parallel production units and the determination of transportation plans for a product and a raw material that minimize the total cost connected with the production and the transportation, are the purpose of the decision-making for such a system. For a special case of non-balanced supply networks, where all production units can produce the same amount of the product from a unit of the raw material, a solution algorithm is presented. It is based on a special decomposition of the problem which allows to determine the solution consecutively for the increasing number of production units involved in the manufacture, starting from the case with only one production unit. A sufficient condition for the optimal solution is proved, and the properties of the algorithm are presented.

Keywords: Supply Chain Integration and Management Issues; Optimisation Methods and Simulation Tools; Transport and Services

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00013

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 52-57

Authors: Lopes, Isabel Cristina; Valério de Carvalho, José Manuel

Abstract: The problem addressed here originates in the industry of flat glass cutting and wood panel sawing, where smaller items are cut from larger items accordingly to predefined cutting patterns. In this type of industry the smaller pieces that are cut from the patterns are piled around the machine in stacks according to the size of the pieces, which are moved to the warehouse only when all items of the same size have been cut. If the cutting machine can process only one pattern at a time, and the workspace is limited, it is desirable to set the sequence in which the cutting patterns are processed in a way to minimize the maximum number of open stacks around the machine. This problem is known in literature as the minimization of open stacks (MOSP). To find the best sequence of the cutting patterns, we propose an integer programming model, based on interval graphs, that searches for an appropriate edge completion of the given graph of the problem, while defining a suitable coloring of its vertices.

Keywords: Manufacturing Production; Optimisation Methods and Simulation Tools

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00014

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 58-63

Authors: Atli, Maen; Achour, Zied; Sava, Alexandre; Rezg, Nidhal

Abstract: This paper presents a control synthesis approach for discrete event systems modelled by partially observable marked graphs. It solves the forbidden state problem for discrete event systems modelled by partially observable event graphs subject to Marking Exclusion Constraints (MEC). Two kind of MEC specifications are considered: MEC-AND or MEC-OR. The main advantage of MEC specifications is an increased modelling power regarding to General Mutual Exclusion Constraints GMEC. We provide a simple optimal controller to enforce MEC specifications with independent critical places. We also propose a suboptimal controller for MEC-OR with dependent critical places belonging to the same direct path.

Keywords: Production Control, Control Systems; Discrete-Event, Hybrid and Continuous Systems

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00015

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 64-69

Authors: Rached, Mansour; Bahroun, Zied; Baboli, Armand; Campagne, Jean-Pierre; Zouari, Belhassen

Abstract: In this paper, we study two information shared simultaneously, the first one coming from the upstream and the second coming from the downstream of the supply chain. We treat the case of a multi-echelons multi-products serial supply chain. This chain is made up of one supplier, one warehouse, one retailer and several customers. Thus, we develop a model to study various scenarios of information sharing. We focus our approach on the decentralised decision, in which, the goal of each link is to minimise its own logistic cost. The difference between these costs shows the value of the studied information sharing and represents the contribution of a scenario compared to another. The proposed model is solved by ILOG CPLEX integrated in JAVA program. The output results are the optimal cost in each studied situation. The numerical experimentation proves to validate contribution of our approach.

Keywords: Optimisation Methods and Simulation Tools; Supply Chain Integration and Management Issues

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00016

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 70-76

Authors: Menicou, Michalis; Vassiliou, Vassos; Christou, Petros; Charalambides, Marios

Abstract: Current economic crisis severely affected construction industry across the Globe. Major construction companies seek product differentiation through improved quality. However, Quality Assurance applied to the construction industry proves to be a challenging task since construction projects are highly customized constituting application of Statistical Process Control principles extremely difficult. Within this context, this paper presents the ongoing activities relating to the development of a real-time quality assurance tool for the Cyprus construction industry. The framework of this tool comprises of (a) a model of the construction process, (b) a list of construction processes, (c) a checklist and (d) an application methodology. Further work to the tool completion is also described

Keywords: Real-Time Decision and Control Algorithms; Production Control, Control Systems; Monitoring, Diagnosis and Maintenance

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00017

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 77-82

Authors: Chaieb Memmi, Imen; Hammami Laaroussi, Sondes

Abstract: We present in this paper a new formulation of the Capacitated Lot sizing and Scheduling Problem with Sequence Dependent set up cost and times (CLSPSD) problem, well known as an NP-Hard problem. We formulate the problem as a non linear model and use it to modify a lot sizing problem described in literature and applied to a real-life problem of a Canadian paper maker where the paper machine represents the bottleneck resource and consequently requires an efficient production planning approach optimizing resource utilization and minimizing production, setup and inventory costs. In these previous works, the dependency of the costs and times with the production sequences isn’t thoroughly dealt with. We prove that by really treating the problem of determining the production sequences, we handle to considerably reduce the supply chain total cost. This cost includes production costs, inventory holding costs, start up and setup costs. The reduction in the total cost varies from 6 to 52% when setup costs vary from 20% to 200% of inventory holding costs.

Keywords: Supply Chain Integration and Management Issues; Production Control, Control Systems; Manufacturing Production

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00019

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 83-88

Authors: Silva Filho, Oscar Salviano; Cezarino, Wagner

Abstract: Aggregate production planning problems are found in an intermediate level of a hierarchical decision process. They are used to anticipate managerial strategies related to the future use of resources of the company. Optimal plans and production scenarios can be provided by solving mathematical models, which are formulated to represent these problems. This paper introduces a managerial decision support system, based on Excel spreadsheet, to deal with aggregate production planning problem. Some computational features of this tool are presented. A case from literature is used as an example to illustrate other aspects of the tool.

Keywords: Production Control, Control Systems; Optimisation Methods and Simulation Tools; Computer Supported Cooperative Work

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00020

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 89-94

Authors: Hammami Laaroussi, Sondes; Chaieb Memmi, Imen

Abstract: The Vendor Management Inventory (VMI) is an integrated approach for customer-supplier coordination in which the supplier is responsible for the management of inventory at the retailer. In this paper, we consider the three periodic inventory policies applied within the framework of VMI approach. The aim is to determine the best policy that minimize the total cost composed by the production cost, the inventory cost at the customer and the supplier and the distribution cost

Keywords: Supply Chain Integration and Management Issues

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00021

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 95-101

Authors: Amrani, Aïcha; Zouggar, Salah; Zolghadri, Marc; Girard, Philippe

Abstract: Company’s competitive advantage can be achieved through its agile capability to satisfy customers’ needs by developing and manufacturing efficiently customized products. So performing ETO (Engineer-To-Order) product with lower lead-times is a real challenge that requires new approaches. This paper investigates a new framework to help decision-makers in adopting the right management systems to organize customer order fulfillment from request to delivery. The European Project “ESTIMATE”, Eurostars Program, is lead to sustain successful ETO processes. The ESTIMATE framework aims at providing guidelines to perform successful ETO product. Main drivers for ETO product fulfillment are identified regarding several dimensions and a strategy of decreasing lead-times is explored and discussed in detail. This strategy is called “shifting strategy”.

Keywords: Manufacturing Production; Collaborative Networks; Supply Chain Integration and Management Issues

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00022

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 102-107

Authors: Hennet, Jean-Claude; Mahjoub, Sonia

Abstract: In the context of fixed market prices for the selected set of goods to be manufactured, supply network formation problems have been previously analyzed as cooperative linear production games. In particular, the profit sharing problem among partners of the winning coalition has been solved by a perfectly competitive solution, called the Owen set. Now, if an enterprise network decides to organize itself as a supply chain and imposes the wholesale price of its manufactured goods, then the supply chain design problem under a price elastic random demand from the market can be formulated as a biform game, combining a strategic subgame with a cooperative subgame. The decision variables of the strategic subgame are the wholesale prices and the retail prices of the goods, while the results of the cooperative subgame are the winning coalition and the payoff profile associated with it. The optimal global value function is then computed as the solution of a quadratic programming problem. In this scheme, the enterprise network plays the role of the Stackelberg leader and the retailer the role of the follower. The paper studies this type of biform games. In particular, it shows the existence of a payoff policy that is fair, efficient and individually rational.

Keywords: Optimisation Methods and Simulation Tools; Hierarchical, Distributed Network and Multiagent System Organisations; Collaborative Networks

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00023

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 108-113

Authors: Eggert, Jan; Künne, Bernd

Abstract: The availability and reliability of intralogistic systems depends significantly on the maintenance of these systems which demands modern maintenance concepts. Hence condition-based maintenance concepts are a very important development. To determine the condition of intralogistic systems a holistic concept has been developed, which combines mobile and stationary sensor units. Mobile units travel along with the regular containers on the conveying system and gather several data. Additional data is collected by the stationary sensor units. Each sensor unit, either mobile or stationary, pre-evaluates the data and only necessary data is transmitted to a central evaluation unit. By using the concept it becomes possible to determine the condition of an intralogistic system. This paper introduces measurement techniques which can be used in this context. Furthermore the new developed monitoring concept will be explained by using a common intralogistic system as an example.

Keywords: Monitoring, Diagnosis and Maintenance

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00024

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 114-119

Authors: Pimentel, Carina; Alvelos, Filipe; Valério de Carvalho, José Manuel; Duarte, António Jorge S. T.

Abstract: In this paper we address a lot splitting and scheduling problem of a Textile factory that produces garment pieces. Each garment piece is made of a set of components that are produced on the knitting section of the company. The problem consists of finding a weekly production plan for the knitting section, establishing the quantities to produce of each component (organized in one or several lots), and where and when (starting/completion times) to produce them. The main contribution of this work is the development of a constructive heuristic that generates automated knitting scheduling plans. The heuristic produces solutions very fast for a set of randomly generated instances based on real world data.

Keywords: Optimisation Methods and Simulation Tools; Manufacturing Production

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00025

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 120-125

Authors: Xu, Chaojun; Sand, Guido; Engell, Sebastian

Abstract: In this paper, the requirements of industrial solutions to plant-wide planning and scheduling problems are discussed. The state-of-the-art algorithms for the coordination of local schedulers are reviewed and a new heuristic method is presented that utilizes the existing distributed scheduling algorithms by considering the coupled due dates and release dates in the distributed schedulers and by penalizing the slacks between the individual optimized schedules and the linking variables iteratively. The performance of the proposed coordination algorithm is evaluated for a prototypical distributed production scheduling problem which consists of two MILP scheduling models. The numerical results show that the proposed coordination scheme is superior compared to fully decentralized and to centralized scheduling algorithms and to other cooperative scheduling methods with respect to solution quality and computational effort.

Keywords: Optimisation Methods and Simulation Tools; Chemical, Biotechnological and Other Industries; Supply Chain Integration and Management Issues

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00026

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 126-131

Authors: Arnault, Baptiste; Soriano, Thierry

Abstract: In the automated production of composite products, the use of a new technology called fibre placement requires to think about both the automated means of production and the product itself. An integrated optimisation approach would consider the couple product/process as a whole instead of separate them, and this would be achieved in a virtual prototyping platform. We are heading towards an optimisation platform allowing to visualise the geometric aspect as well as the production routing. Criteria have been defined and the setting up of the interface and communication with industrial tools is in progress.

Keywords: Optimisation Methods and Simulation Tools; Man-Machine and Cooperative Systems; Manufacturing Production

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00027

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 132-138

Authors: Carvalho, Marcius Fabius; Silveira, Adriano; Ramos, José

Abstract: A supply chain is an alliance of independent business players, such as supplier, manufacturing, and distribution processes that perform the critical functions in order reach a business objective delivering value to customer and companies. Strategic design decisions as number of supply chain levels, numbers of nodes at each level, distance between nodes and definition of operations for each node contribute for better performance of the production and delivery of a variety of products to the customers. This paper presents an auto-part automotive supply chain redesign case study that has as objective to delivery modules to the assemble plant at lowest cost, high quality, and short lead time. It starts with a review of the legal procedures as the fees and taxes of the concerned States and after an analysis of logistics costs, values of labor, agility of the entire system and competitiveness, essential for the automobile company in the current scenario, are considered. At the end indexes of performance of the actual and proposed supply chain are compared to show the advantages of a new design.

Keywords: Supply Chain Integration and Management Issues; Collaborative Networks; Manufacturing Production

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00028

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 139-143

Authors: Mujica Mota, Miguel Antonio; Piera Eroles, Miquel Angel

Abstract: The scheduling of flexible manufacturing systems has received great importance as a key factor to improve competitiveness in industrial systems. In this paper it is presented an improvement of a two-phase optimization algorithm for Timed Coloured Petri Nets. The algorithm explores the compacted state space of manufacture models in order to find particular objective states giving the sequence of events that drives the model to the objective state with optimal times. The proposed approach is improved with the implementation of a time driven algorithm based on the shortest processing time which defines the successor states to be evaluated when time is used as a cost function. The developed algorithm is tested with benchmarks problems to demonstrate its efficiency to cope with models of combinatorial nature.

Keywords: Optimisation Methods and Simulation Tools; Discrete-Event, Hybrid and Continuous Systems; Manufacturing Production

Digital Object Identifier (DOI): 10.3182/20100908-3-PT-3007.00029

Conference: 5th Conference on Management and Control of Production Logistics (2010)

Location: University of Coimbra, Portugal

Start Date: Wed Sep 08 2010 - End Date: Fri Sep 10 2010

Page Numbers: 144-151