Personne : Rönnqvist, Mikael
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Département de génie mécanique, Faculté des sciences et de génie, Université Laval
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Voici les éléments 1 - 10 sur 36
- PublicationAccès libreThe online wood supply game(INFORMS, 2017-07-24) Marier, Philippe; Rönnqvist, Mikael; D'Amours, Sophie; Azouzi, Riadh.; Fjeld, DagThis paper describes the Wood Supply Game (WSG), a prize-winning e-learning tool that is freely available for players all over the world. The game effectively helps students and managers realize the challenges in managing demand and supply in wood supply chains, and gain insight into the types of measures required to make these divergent chains effective. The WSG is an adaptation of the Beer game, a popular didactic tool used to empirically demonstrate demand amplification in a simple and generic context. The supply chain modeled by the Beer game does not involve co-products, and thus is very different from the wood supply chain, which is divergent by nature. The WSG presented in this paper models a supply network with one point of divergence and demand for two products. This preserves the simplicity of the game but enables it to offer a base for supply network simulation in a large number of industrial sectors with divergent processes. We describe an online version of the WSG, discuss our experiences playing it with students and managers, and provide hints to the instructor.
- PublicationRestreintAn empirical study on coalition formation and cost/savings allocation(2011-09-16) Rönnqvist, Mikael; Audy, Jean-François.; D'Amours, SophieInterest has been raised by the recent identification of potential savings through collaborative planning in logistics operations. Even though substantial savings can be realized, two key questions exist: (i) how should potential savings be divided among a group of collaborating companies and (ii) among potential collaborating companies, how should collaborating group(s) be formed? These two questions are studied in a specific context: among potential collaborating companies; a subset, denoted the leading companies, performs collaborative planning on behalf of the others and together, they initiate formation of a collaborating group. We use the concept of a business model to detail such context. Based on the literature on network formation where potential savings are modelled by a cooperative game, four business models are explored in four different subsets of leading companies. We propose a network model as a method to determine the stable collaborating group in each computation. A case study including eight forest companies is described and analyzed. Results show that very different solution characteristics can be achieved depending on the business model selected.
- PublicationRestreintA mixed integer programming model to evaluate integrating strategies in the forest value chain — a case study in the Chilean forest industry(National Research Council of Canada, 2015-04-07) Troncoso, Juan; Rönnqvist, Mikael; D'Amours, Sophie; Flisberg, Patrik; Weintraub, AndrésWhen a company is integrated vertically, it can manage and plan its overall value chain in one direct and integrated approach. However in many cases, companies follow a decoupled approach where forests and production plants optimize separately their processes in a supply-driven strategy. In Chile, the two largest forest companies are vertically integrated (i.e., they own forest and mills that produce logs, lumber, plywood, pulp, paper, and bioenergy, etc.). Historically, they have coordinated their value chains using a make-to-stock strategy, for which the forest is the main driver of the value chain activities. In this paper, we propose an integrated planning approach to show the impacts of a demand-driven integration of the value chain in the forest industry. To compare this strategy with the decoupled strategy, we propose a mixed integer programming (MIP) model for the integrated strategy. To illustrate our proposal, we use forest and production information from a Chilean forest company. The decoupled strategy, where the forest and industry planning are planned separately, uses two models. The first model deals with the forest management and harvesting decisions and maximizes the expected net present value (NPV) of logs. In this model, the planning horizon covers one full forest rotation, which in Chile corresponds to about 25 years. The second model maximizes the NPV of the downstream operations for a shorter business planning horizon (five years) constrained by the availability of the logs from the first model. In the integrated approach, all parts of the value chain (forest, transportation, and mills) are driven by final product demand and where the objective is tomaximize the profit of the company (NPV of the entire value chain). The demand is only given for the shorter business planning horizon. The two strategies are evaluated using the MIP model, and NPV is used to determine the best practice. According to the results, the NPV can increase up to 5.0% when the proposed integrated strategy is implemented compared to a decoupled strategy. Moreover, the profit for the business period increases up to 8.5%
- PublicationAccès libreAn educational game with dragons’ den experiences for supply chain management training(INFORMS, 2020-03-30) Feng, Yan; Rönnqvist, Mikael; Audy, Jean-François.; D'Amours, SophieThis article presents an educational game to engage university and industrial stakeholders in collaborative training for supply chain management courses. The game will help students learn complex supply chain management issues. There are two integrated parts: a case ethod through an industrial case and an activity-based game featuring role plays based on international television shows such as Dragons’ Den in Canada or Shark Tank in the United States. We developed a game framework to illustrate how the game can be prepared and played in classrooms. Although the game is primarily developed for classroom teaching, it may be adapted to other training environments. We have provided two examples to demonstrate how the game can be played as a short game in conference environments. Game experiences and feedback are presented with comments from various game participants. By interacting with stakeholders and tackling a real-world business case, students can better understand stakeholders’ business goals, the importance of supply chain collaboration, and the impacts on supply chain decisions.
- PublicationRestreintDeveloping training for industrial wood supply management(Forest products society, 2014-09-16) Fjeld, Dag; Marier, Philippe; Rönnqvist, Mikael; Eriksson, Ljusk Ola; Lemieux, Sébastien; Frisk, Mikael; D'Amours, SophieAn understanding of supply chain management is a prerequisite for efficient supply operations. This paper presents the structure of training currently used in Sweden to prepare master’s-level foresters for managing wood supply operations. Based on a basic framework of professional tasks, eight key learning outcomes are targeted; one focuses on raw material requirements, three on securing supply, three on enabling delivery, and one on control and coordination. Sixteen exercises are used to meet the eight learning outcomes. An overview of the exercises is presented as well as the pedagogical approach used. Current training is focused on developing student understanding of the industrial context as well as competences and skills required to solve typical professional tasks. The paper concludes with a discussion of further development opportunities including a coupling of tasks and learning outcomes with applicable operations research methodology.
- PublicationAccès libreAn educational game in collaborative logistics(InformsPubsOnline, 2013-01-01) Rönnqvist, Mikael; D'Amours, SophieWe describe an educational game in collaborative logistics. The game is based on an award-winning application in cost allocation in transportation. The purpose of the game is to acquire an understanding of negotiation, coalition building, and cost/profit sharing when the players have different powers and hold different levels of information. The game is played with each player representing a single company. The challenge for the players is to find an efficient coalition and to share the benefits and costs of the collaboration. We describe the underlying case study, review basic concepts in game theory, outline the teaching case, and discuss experiences from running the game in several countries and with students in business, engineering, and forestry.
- PublicationAccès libreIntegrated optimization of strategic and tactical planning decisions in forestry(Elsevier, 2016-11-12) Bouchard, Mathieu; Rönnqvist, Mikael; D'Amours, Sophie; Azouzi, Riadh.; Gunn, Eldon A.The traditional approach to plan the forest products value chain using a combination of sequential and hierarchical planning phases leads to suboptimal solutions. We present an integrated planning model to support forest planning on the long term with anticipation of the impacts on the economic and logistic activities in the forest value chain on a shorter term, and we propose a novel optimization approach that includes acceleration strategies to efficiently solve large-scale practical instances of this integrated planning problem. Our model extends and binds the models implemented in two solver engines that have developed in previous work. The first system, called Logilab, allows for defining and solving value chain optimization problems. The second system, called Silvilab, allows for generating and solving strategic problems. We revisit the tactical model in Logilab and we extend the strategic model in Silvilab so that the integrated planning problem can be solved using column generation decomposition with the subproblems formulated as hypergraphs and solved using a dynamic programing algorithm. Also, a new set of spatial sustainability constraints is considered in this model. Based on numerical experiments on large-scale industrial cases, the integrated approach resulted in up to 13% profit increase in comparison with the non-integrated approach. In addition, the proposed approach compares advantageously with a standard LP column generation approach to the integrated forest planning problem, both in CPU time (with an average 2.4 factor speed-up) and in memory requirement (with an average reduction by a factor of 20).
- PublicationRestreintUsing operational research for supply chain planning in the forest products industry(INFOR Journal, 2017-01-18) Rönnqvist, Mikael; D'Amours, Sophie; Weintraub, AndresOver the years, Operational Research (OR) has been used extensively to support the forest products industry and public forestry organizations (e.g., governments, environmental protection groups) in their respective planning activities concerning the flow of wood fiber from the forest to the customer. The applications deal with a wide range of problems, ranging from long-term strategic problems related to forest management or company development to very short-term operational problems, such as planning for real-time log/chip transportation or cutting. This paper presents an overview of the different planning problems and reviews the past contributions in the field of forestry, with a focus on applications and problem descriptions. In the context of the 50th anniversary of the Canadian Operational Research Society, this paper also recognizes the contributions of many Canadian researchers to the field of forestry management.
- PublicationRestreintAdvances in profit-driven order promising for make-to-stock environments – a case study with a Canadian softwood lumber manufacturer(INFOR Journal, 2016-08-31) Azevedo, Rodrigo Cambiaghi; Rönnqvist, Mikael; D'Amours, SophieProfit-driven order promising mechanisms have been receiving increasing attention from academia and practitioners in recent years. In spite of the recent advances in the field, its application in practice still remains a challenge. One of the most interesting approaches currently discussed is called aATP (allocated available-to-promise). In this paper, we propose some advances for current state-of-the-art aATP constructions in make-to-stock environments, mainly adapting it to commodity products sold through spot markets. Practical situations are tested through simulations supported by real data obtained from a major softwood manufacturer in Canada. Examples show that the proposed approach can increase the profitability of the producer.
- PublicationRestreintA framework for an efficient implementation of logistics collaborations(Oxford Blackwell, 2010-12-07) Rönnqvist, Mikael; Lehoux, Nadia; Audy, Jean-François.; D'Amours, SophieIn order to beat the competition, access new markets, and respect operational, social, and environmental constraints, enterprises establish collaborations with many other business entities. Furthermore, with costs and information sharing, organizations have the opportunity to optimize their logistics activities. However, each enterprise has its own objectives and typically makes its own planning decisions to meet these objectives. Therefore, it becomes crucial to determine how business entities will work together as well as the value of the collaboration. Specifically, it is necessary to identify how logistics activities will be planned and executed, who will take the leadership of the collaboration, and how benefits will be shared. In this article, we explain how to efficiently build and manage inter-firm relationships. Moreover, we propose five coordination mechanisms that contribute to ensure information sharing, the coordination of logistics activities, and the sharing of benefits. Case studies are used to demonstrate the utility of the framework.