EvaSylv: A user-friendly software to evaluate forestry scenarii including natural risk

Forest management relies on the evaluation of silviculture practices. The increase in natural risk due to climate change makes it necessary to consider evaluation criteria that take natural risk into account. Risk integration in existing software requires advanced programming skills.We propose a user-friendly software to simulate even-aged and monospecific forest at the stand level, in order to evaluate and optimize forest management. The software gives the possibility to run management scenarii with or without considering the impact of natural risk. The control variables are the dates and rates of thinning and the cutting age.The risk model is based on a Poisson processus. The Faustmann approach, including tree damage risk, is used to evaluate future benefits, economic or ecosystem services. It relies on the calculation of expected values, for which a dedicated mathematical development has been done. The optimized criteria used to evaluate the various scenarii are the Faustmann value and the Averaged yield value.We illustrate the approach and the software on two case studies: economic optimization of a beech stand and carbon sequestration optimization of a pine stand.Software interface makes it easy for users to write their own (growth-tree damage-economic) models without advanced programming skills. The possibility to run management scenarii with/without considering the impact of natural risk may contribute improving silviculture guidelines and adapting them to climate change. We propose future lines of research and improvement

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A Supervisory Control Synthesis Case Study: The Antenna Control System

We devised an algorithm for deriving controllers for timed discrete-event systems with nonterminating behavior modeled by timed transition graphs and control requirements expressed by Metric Temporal Logic (MTL) formulas. This algorithm has several interesting features. Firstly, it simultaneously handles the issues of controllability, safety, liveness, and real time in a single framework. Secondly, time and space complexity of the algorithm is reduced thanks to ingenious search and representation techniques. This algorithm has a general character and is implemented in a system called Temporal Controller Synthesis Tool (TCST). In our research, there is a strong commitment to the application of theoretical research results. We validated our algorithm through case studies. This is very important for assessing its realism. This paper presents the application of our algorithm to the derivation of a controller for an Antenna Rotor Control System (ARCS). The ARCS is responsible for orienting ..

Synthesizing plant controllers using real-time goals

This paper introduces a novel planning method for reactive agents. Our planning method handles, in a single framework, issues from AI, control theory, and concurrency that have so far been considered apart. These issues are mostly controllability, safety, bounded liveness, and real time. Our approach is founded on the supervisory control theory and on Metric Temporal Logic (MTL). The highlights of our method consist of a new technique for incrementally checking MTL goal formulas over sequences of states generated by actions and a new method for backtracking during search by taking into account uncontrollable actions.

A Multimedia On-line Assistance System with Safe Remote Control of Applications

This paper tackles the problem of efficiently helping software end users. Assistance to end users has become increasingly critical to the productivity of organizations. The cost of a person or a group of people that provides assistance is substantial. Besides, safety and confidentiality of end-user information are often compromised when assistance is provided. Remote assistance using remote-control and visualization software is one of the means to efficiently provide assistance to end users. Several software systems have been proposed to take the control of remote computers and applications, but few of them take into account human aspects and guarantee security and confidentiality of information. Consideration of these elements is necessary for practical remote resolution of problems. Using concepts from the field of groupware and remote control of computers, we have devised software to provide remote assistance to end users while insuring security and confidentiality of information as..

An Efficient Algorithm for Controller Synthesis under Full Observation

This paper presents a simple and flexible on-line synthesis algorithm that derives the optimal controller for a given environment. It consists of finding the greatest possible number of admissible event sequences of a discrete-event system with respect to a requirements specification. It generates and explores the state space on-the-fly and uses a control-directed backtracking technique. Compared to a previous algorithm of Wonham and Ramadge, our algorithm does not require explicit storage of the entire work space and backtracks on paths of arbitrary length to prune the search space more efficiently. The paper also discusses an implementation of our algorithm and includes an evaluation of its performance on a variety of problems. 1 Introduction Control problems involve finding an efficient machine that senses and controls an environment through connections and guarantees satisfaction of requirements [9]. These machines have wide applications in areas ranging from robotics and manufact..