1,721,208 research outputs found
AN ANALYTIC ALGORITHM FOR UNBALANCED STRIPLINE IMPEDANCE - COMMENTS
No full textSome new results related to characteristic impedances of undercut lines are presented considering various line geometries
A neural inverse problem approach for optimal design
No full textAn original approach to the optimization of electromagnetic structures is presented that makes use of a neural network trained to capture the functional relationship between the design parameters and the objective function. The algebraic structure of the network is used to find the basins of attraction of the objective function of the optimization problem, avoiding the major drawbacks of the commonly used algorithms, i.e., the entrapment in local minima, and/or the huge amount of cost function evaluations
Discrete event representation of qualitative models using Petri nets
No full textThe paper discusses how Petri nets may be used for the qualitative modeling of physical systems. The qualitative state of a system is represented by the marking of the net. The crossing of a landmark value corresponds to the firing of a transition. We give a formal procedure to construct a Petri net model corresponding to a given set of qualitative equations. The approach can be used to study both autonomous systems and systems with forcing inputs. The dynamic behavior of the system can be studied as sequences of reachable markings of the net and can be computed with standard Petri net execution techniques. This approach also leads to a simple framework for the study of hybrid systems, i.e., systems whose behavior is described by both continuous and discrete event dynamics. Several examples, with applications to diagnosis and control, are fully discussed
Artificial Neural Network Experiment Group (2002) 'An International Comparative Study of Artificial Neural Network Techniques for River Stage Forecasting'
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