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This paper proposes methodologies for modeling and assessment of equipment and industrial processes susceptibility to voltage sags and short interruptions. Voltage sag severity indices are proposed that translate physical disturbance events into expected equipment behavior, allowing fast identification of possible process failure. Based on these indices, probabilistic and fuzzy-based methodologies are developed to provide realistic equipment representation and to incorporate flexibility for customized process modeling. Extensive simulations showed that the proposed models and methodologies yield greater accuracy in assessments compared to conventional approaches. [ABSTRACT FROM AUTHOR]

Response surface methodology (RSM) is a collection of statistical design and numerical optimization techniques traditionally used to optimize industrial processes. In this paper, we demonstrate that the methodology can be successfully applied to the domain of networking. Specifically, we obtain increased throughput with a significant decrease in delay in a ns-2 simulation model of a mobile ad hoc network (MANET) by using RSM to optimize protocol interaction found by factor screening. Whether the experimentation is with a stochastic simulation model or a physical system, such as a MANET or a wireless sensor network test-bed, RSM provides a general and practical methodology to screen factors and robustly and jointly optimize responses. [ABSTRACT FROM AUTHOR]

The design of waveguide low-pass filters is accomplished with a new method, where focus is on the upper stopband performance rather than passband or roll-off requirements. Using an efficient multimode variational formulation, composite filters are generated by direct optimization from an arbitrary number of partial corrugated subelements, each showing mutual TE10-mode passband and different nonintersecting passbands corresponding to higher order modes. The flexibility of this method leads to optimal filter solutions, having the designer full control over key dimensional features, i.e., minimum gap and cavity length. It is therefore possible to design low-pass filters exhibiting broad stopbands free of spurious propagation, without penalties of higher losses, lower power handling capability, larger size, and/or increased manufacturing complexity. Simulated and measured results demonstrate significant advantages over filters designed with conventional methods. [ABSTRACT FROM PUBLISHER]