43 hasil untuk "Alessandro Ferrarini"
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Incorporating climatic change into ecological connectivity: Climatic Flow Connectivity
There's an urgent need of theoretical and methodological tools to predict how much and how climate change will impact animal movements. In fact, conservation planning aimed to facilitate species movement in the face of climate change strictly requires realistic predictions of where species will…
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Local and global control of ecological and biological networks
Recently, I introduced a methodological framework so that ecological and biological networks can be controlled both from inside and outside by coupling network dynamics and evolutionary modelling. The endogenous control requires the network to be optimized at the beginning of its dynamics (by…
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Delayed control of ecological and biological networks
Evolutionary Network Control (ENC) was introduced in 2011 to permit the control of any kind of ecological and biological networks, with an arbitrary number of nodes and links. To date, ENC has been applied with the idea to control biological and ecological networks since the beginning of their…
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Some steps forward in semi-quantitative networks modelling
System dynamics is an umbrella term for those approaches aiming to understand the behaviour of network-like systems over time. What makes system dynamics different from other methods about complex systems is the use of feedback loops, stocks and ?ows which allow to model how network-like systems…
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Evolutionary Network Control also holds for nonlinear networks: Ruling the Lotka-Volterra model
The proof of our understanding of ecological and biological systems is measured by our skill to rule them, i.e. to channelize them towards a desired state. Control is a cardinal issue in most complex systems, but because a general theory to apply it in a quantitative manner has been absent so far…
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Fuzzy cognitive maps outmatch loop analysis in dynamic modeling of ecological systems
Modeling natural systems is challenging due to their complexity in terms of variables, interactions, and dynamics. Much of this complexity is rooted in the existence of multiple ways through which acting variables affect each other. Besides the simple direct effects, numerous indirect effects…
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A fitter use of Monte Carlo simulations in regression models
In this article, I focus on the use of Monte Carlo simulations (MCS) within regression models, being this application very frequent in biology, ecology and economy as well. I'm interested in enhancing a typical fault in this application of MCS, i.e. the inner correlations among independent…
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Detecting ecological breakpoints: a new tool for piecewise regression
Simple linear regression tries to determine a linear relationship between a given variable X (predictor) and a dependent variable Y. Since most of the environmental problems involve complex relationships, X-Y relationship is often better modeled through a regression where, instead of fitting a…
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Ecological connectivity: Flow connectivity vs. least cost modelling
Recently I have introduced a modelling approach (flow connectivity) to ecological connectivity that is alternative to circuit theory, and is able to fix the weak point of the "from-to" connectivity approach. Flow connectivity also holds for mountain and hilly landscapes that are not composed of…
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Bit by bit control of nonlinear ecological and biological networks using Evolutionary Network Control
Evolutionary Network Control (ENC) has been first introduced in 2013 to effectively subdue network-like systems. ENC opposes the idea, very common in the scientific literature, that controllability of networks should be based on the identification of the set of driver nodes that can guide the…
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Network modelling is strictly required for predicting climate change impacts on biodiversity
Robust models are pivotal to the prediction of future climate change impacts on biodiversity. A move must be made away from individualistic models of single species toward the implication of synergistically interacting species. The focus should be on the indirect effects due to biotic interactions…
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Some thoughts on the control of network systems
The controllability of network-like systems is becoming a trendy key-issue in many disciplines, including ecology and biology. To control a biological, ecological or economic system is to make it behave according to our wishes, at the least possible cost. In this paper, I propose some ideas on…
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Controlling ecological and biological networks via evolutionary modelling
The controllability of network-like systems is a topical key-issue in many disciplines, including ecology and biology. It relies on the ability to guide a system's behaviour towards the desired state through the appropriate handling of a few input variables. To date, controllability of networks is…
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Structural control of ecological and biological networks
Evolutionary Network Control (ENC) allows the control of any kind of ecological and biological network, with an arbitrary number of nodes and links. In this work, ENC has been further expanded to incorporate the structural control of any kind of ecological and biological network. The rationale…
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WORTHY: a new model for ecological ranking and evaluation
Ecological ranking and environmental decision making require that a set of objects (e.g., competing sites for species introduction, or alternative sites for the allocation of man-made features) are listed from the best to the worst one. The resulting ranking is then used to choose which actions to…
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Networks control: Introducing the degree of success and feasibility
Taming ecological and biological networks is a key-issue. It could be used to: a) neutralize damages to ecological and biological networks, b) safeguard rare and endangered species, c) manage ecological systems at the least possible cost, and d) counteract the impacts of climate change. While I…
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A deeper insight into the equilibrium of biological and ecological networks
The equilibrium of biological and ecological networks is often studied using eigenvector-eigenvalue analyses in order to reckon steady/unsteady properties and trajectories. Although at equilibrium inputs equal outputs for all the system variables, network flows continue to happen. Therefore, in…
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Computing the uncertainty associated with the control of ecological and biological systems
Recently, I showed that ecological and biological networks can be controlled by coupling their dynamics to evolutionary modelling. This provides numerous solutions to the goal of guiding a system's behaviour towards the desired result. In this paper, I face another important question: how reliable…
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Decentralized control of ecological and biological networks through Evolutionary Network Control
Evolutionary Network Control (ENC) has been recently introduced to allow the control of any kind of ecological and biological networks, with an arbitrary number of nodes and links, acting from inside and/or outside. To date, ENC has been applied using a centralized approach where an arbitrary…
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Artikel Jurnal Teks lengkap
A new fuzzy algorithm for ecological ranking
Ecological ranking is a prerequisite to many kinds of environmental decisions. It requires a set of 'objects' (e.g., competing sites for species reintroduction, or competing alternatives of environmental management) to be evaluated on the basis of multiple weighted criteria, and then ranked from…