Analysis and modeling of green wood milling: Chip production by slabber

During the primary transformation of wood, logs are faced with slabber heads. Chips produced are raw materials for pulp paper and particleboard industries. Efficiency of these industries is partly due to particle size distribution. Command of this distribution is no easy matter because of great dependence on cutting conditions and variability in material. This study aimed a better understanding and predictionof chip fragmentation. It starts with a detailed description of cutting kinematic and interaction between knife and log. This leads to the numerical development of a generic slabber head. Chip fragmentation phenomena were studied through experiments in dynamic conditions. These experiments were carried out thanks to a pendulum (Vc = 400 m/min). It was instrumented with piezoelectric force sensors and high speed camera. Obtained results agreed very well with previous quasi-static experiments

Integrating Adaptation Mechanisms Using Control Theory Centric Architecture Models: A Case Study

International audienceControl theory provides solid foundations for developing reliable and scalable feedback control for software systems. Although, feedback controllers have been acknowledged to efficiently solve common classes of problems, their adoption by state-of-the-art approaches for designing self-adaptation in legacy software systems remains limited and at best consists in ad hoc integrations, which are usually engineered manually. In this paper, we revisit the Znn.com case study and we present an alternative implementation based on classical feedback controllers. We show how these controllers can be easily integrated into software systems through control theory centric architecture models and domain-specific modeling support. We also provide an assessment of the resulting properties, quality attributes and limitations

Manipulating Models Using Internal Domain-Specific Languages

International audienceIn Model-Driven Engineering, a number of external Domain-Specific Languages (DSL) for model manipulation have been proposed. However, they require users to learn new languages that, together with their execution performance, usability and tool support limitations, can significantly contribute to accidental complexities. In this paper, we present an alternative approach based on internal DSLs in Scala for model consistency checking and model transformations for the Eclipse Modeling Framework

La gestion du sanglier : modèle bioéconomique, dégâts agricoles et prix des chasses en forêt domaniale

[paper in French] Wild-boar can be considered both as a resource and as a pest. It causes collective damages and is also valued resource for recreative activity as hunting. The paper treats the economy of controlling a hunting game. A bio-economic model is presented and used for the analysis. The optimal population of big game is the one minimizing the present value of the hunter willingness to pay less agricultural damages with an infinite time horizon. We take into consideration the loss of the hunter welfare from a decrease in game population. For the empirical analysis, we used data on agricultural damages caused by wild-boar in order to reconstruct their population dynamics. Hunter marginal implicit prices for game hunting were estimated using the hedonic price method on a sample of hunting lease prices in eastern French forests. The long term equilibrium solutions can provide elements for optimal control strategies of wild-boarbio-economic model, management, hunting, agricultural damages, hedonic approach

Nuisible ou gibier ? Une analyse économique de la chasse des grands animaux en France

(article en français) Increasing populations of big game in France, including wild boar, has resulted in an increase in collective damages. However, this species is not only regarded as harmful as it is valued by the practice of hunting. The article aims to characterize the social optimum by engaging natural resource economics. The optimum density of game populations is defined from a bio-economic model that takes into account all the costs and profits relating to hunting and the presence of game. It is compared to that corresponding to the hunters’ optimum and to the “tragedy of the commons”. The analytical framework allows an economic interpretation of the evolution of hunting in France and of the institutional and legislative context, while focusing on issues of property rights and externalities. The model developed is then used to discuss game management policies and recommendations on economic tools for these policies.bio-economic modeling, management, game, hunting, damages

Next-Generation Model-based Variability Management: Languages and Tools

International audienceVariability modelling and management is a key activity in a growing number of software engineering contexts, from software product lines to dynamic adaptive systems. Feature models are the defacto standard to formally represent and reason about commonality and variability of a software system. This tutorial aims at presenting next generation of feature modelling languages and tools, directly applicable to a wide range of model-based variability problems and application domains. Participants (being practitioners or academics, beginners or advanced) will learn the principles and foundations of languages and tool-supported techniques dedicated to the model-based management of variability