The problem of designing an adaptive robust H∞ dynamic output feedback controller for uncertain linear systems is considered. The uncertainties are assumed to be time-varying, unknown, but bounded, which appear affinely in the matrices of system model. Based on the online estimations of uncertain parameters, a robust dynamic output feedback controller with variable gains is constructed to compe...

Many vertebrates, forest herbs, and trees exhibit both variable age at maturity and iteroparity as adaptations to uncertain environments. We analyze a stochastic model that combines these two life-history adaptations with density-dependent fertility. Results for a model with only iteroparity are consistent with previous work; environmental uncertainty favors adult survival over juvenile surviva...

Uncertain hypothesis test is a statistical tool that uses uncertainty theory to determine whether some hypotheses are correct or not based on observed data. As an application of uncertain test, this paper proposes method differential equation fits the data not. In order demonstrate method, numerical examples provided. Finally, both currency model and stochastic used US Dollar Chinese Yuan (USD–...

Inspired from the robust control principle, a robust scheduling method is proposed to solve uncertain scheduling problems. The uncertain scheduling problem is modeled by a set of workflow simulation models, and then a scheduling scheme (solution) is evaluated by the results of workflow simulations that are executed by using the workflow models in the set. A variable neighborhood immune algorith...

Recent decades have seen great progress in the use of stochastic methods to model aspects of water resource problems. However, the design implications of stochastic modeling have been relatively overlooked. In particular, there is little explicit realization that the stochastic modeling of single-valued, yet uncertain phenomena yields qualitatively different information than the stochastic mode...

A Dempster-Shafer belief structure provides a mechanism for representing uncertain knowledge about a variable. A compatibility relation provides a structure for obtaining information about one variable based upon our knowledge about a second variable. An inference scheme in the theory of evidence involves the use of a belief structure on one variable, called the antecedent, and a compatibility ...

Abstract This special issue of Cadernos EBAPE.BR sought to provoke a reflection focused on uncertain consumption practices in an future. While prior marketing and consumer research has explored framed by institutionalized, known, more or less predictable context, the set articles approved this edition reveals different nuances. From experiential accounts grief role music coping with struggles i...

A new approach to control system design for systems containing uncertain, nonsmooth friction is proposed. The method is based on a multi-state backstepping approach to variable structure control design. Stability and robustness properties are investigated and an example is given.

Age replacement policy is concerned with finding an optional time to minimize the cost, at which time the unit is replaced even if it does not fail. So far, age replacement policy involving random age has been proposed. This paper will assume the age of the unit is an uncertain variable, and find the optimal time to replace the unit.