Search results for "Complex system"
showing 10 items of 226 documents
Generalized ``transition probability''
1975
An operationally meaningful symmetric function defined on pairs of states of an arbitrary physical system is constructed and is shown to coincide with the usual “transition probability” in the special case of systems admitting a quantum-mechanical description. It can be used to define a metric in the set of physical states. Conceivable applications to the analysis of certain aspects of Quantum Mechanics and to its possible modifications are mentioned.
An empirically grounded agent based model for modeling directs, conflict detection and resolution operations in air traffic management
2017
We present an agent based model of the Air Traffic Management socio-technical complex system that aims at modeling the interactions between aircrafts and air traffic controllers at a tactical level. The core of the model is given by the conflict detection and resolution module and by the directs module. Directs are flight shortcuts that are given by air controllers to speed up the passage of an aircraft within a certain airspace and therefore to facilitate airline operations. Conflicts resolution between flight trajectories can arise during the en-route phase of each flight due to both not detailed flight trajectory planning or unforeseen events that perturb the planned flight plan. Our mod…
Feigenbaum graphs: a complex network perspective of chaos
2011
The recently formulated theory of horizontal visibility graphs transforms time series into graphs and allows the possibility of studying dynamical systems through the characterization of their associated networks. This method leads to a natural graph-theoretical description of nonlinear systems with qualities in the spirit of symbolic dynamics. We support our claim via the case study of the period-doubling and band-splitting attractor cascades that characterize unimodal maps. We provide a universal analytical description of this classic scenario in terms of the horizontal visibility graphs associated with the dynamics within the attractors, that we call Feigenbaum graphs, independent of map…
Ecological Complex Systems
2008
Main aim of this topical issue is to report recent advances in noisy nonequilibrium processes useful to describe the dynamics of ecological systems and to address the mechanisms of spatio-temporal pattern formation in ecology both from the experimental and theoretical points of view. This is in order to understand the dynamical behaviour of ecological complex systems through the interplay between nonlinearity, noise, random and periodic environmental interactions. Discovering the microscopic rules and the local interactions which lead to the emergence of specific global patterns or global dynamical behaviour and the noises role in the nonlinear dynamics is an important, key aspect to unders…
When financial economics influences physics: The role of Econophysics
2019
This paper aims at analyzing the unexpected influence of Financial economics on Physics. The rise of Econophysics, a fundamentally new approach in finance, suggests that the influence between the two disciplines becomes less unilateral than in the past. Methodological debates emerging in Econophysics led physicists to acknowledge that dealing with financial complex systems contributed to a wider modelling of their field. The approach of econophysicists suggests that physicists might try to conceptualize physical phenomena by integrating elements they faced with in Financial economics, and more generally in Economics. Surprisingly, many of econophysicists’ argumentations have some methodolog…
When Financial Economics Influences Physics: The Role of Econophysics
2018
This paper aims at analyzing the unexpected influence of Financial economics on Physics. The rise of Econophysics, a fundamentally new approach in finance, suggests that the influence between the two disciplines becomes less unilateral than in the past. Methodological debates emerging in Econophysics led physicists to acknowledge that dealing with financial complex systems contributed to a wider modelling of their field. The approach of econophysicists suggests that physicists might try to conceptualize physical phenomena by integrating elements they faced with in Financial economics, and more generally in Economics. Surprisingly, many of econophysicists’ argumentations have some methodolog…
Adaptive Sequential Interpolator Using Active Learning for Efficient Emulation of Complex Systems
2020
Many fields of science and engineering require the use of complex and computationally expensive models to understand the involved processes in the system of interest. Nevertheless, due to the high cost involved, the required study becomes a cumbersome process. This paper introduces an interpolation procedure which belongs to the family of active learning algorithms, in order to construct cheap surrogate models of such costly complex systems. The proposed technique is sequential and adaptive, and is based on the optimization of a suitable acquisition function. We illustrate its efficiency in a toy example and for the construction of an emulator of an atmosphere modeling system.
Panel Summary: Planning And Plasticity in Artificial and Natural Systems
2001
Boncinelli underlined often, during our workshop, that simplest organisms are the more robust and they survived longer than more evolved organisms (what about the quality of their life?). This depends on the fact that complex systems either natural or artificial need for more complex controls. Moreover, planning strategies, one of the steps for finding optimal solutions, must be carefully designed and it is complex too.
Experiencing the Smart City Concept: The Challenge of Intelligent Districts
2016
Future cities will become a complex system of variable geometry, where ICT is the main driver of all connections, an intelligent tool that enables the dialogue between different systems, the bonding agent of the smart city. The man still remains the main actor, because he redesigns his habits, corrects his behaviors, shares ideas and solutions based on continuous feedback from the environment. The areas where there are large urban innovations are the field of mobility and energy and ICT of course. Approaches to intelligent cities implementations change, because they are powered by the aspects related to communication. The dimension of the smart districts appears to be the only convincing mo…
A Complex Adaptive System Framework for Management and Marketing Studies
2015
This theoretical work aims to analyze the choice of strategicmanagement activities, taking into account a complex systems perspective. Following this approach, we represent the firm as a complex adaptive system, in which the management must be able to develop and implement different behaviors in order to dynamically ensure the viability of the firm or system. This implies that the management governing the firm or system is capable of choosing, from among a number of heterogeneous entities, the relevant stakeholders within the competitive context and of creating and maintaining significant relationships with them, which are considered to be relevant in a turbulent environment. As an expressi…