Hydrologic analyses are commonly based on a single conceptual model. Yet hydrologic environments are open and complex, rendering them prone to multiple interpretations and conceptualizations. Considering conceptual model uncertainty is a critical process for the assessment of hydrologic uncertainty. This study assesses recharge and geologic model uncertainty for the Climax Mine area of the Neva...

The concept of parametric stability is extended to include Lur’e-type nonlinear control systems with uncertain parameters and constant reference inputs. Conditions for parametric absolute stability are derived, which guarantee that the system remains stable despite uncertainty of equilibrium location caused by parametric uncertainties and values of the reference input. The conditions can be tes...

Conventional nonholonomic motion planning and control theories do not incorporate the effects of uncertain terrain. This paper discusses some basic issues of motion planning and control for kinematic vehicles on uncertain terrain. We extend proofs of local stabilizability for time varying feedback laws to vehicles on uncertain terrain by showing that terrain can be modeled as parametric uncerta...

This paper is concerned with the design of robust controllers for active suspensions using μ methods, which take the structure of the model uncertainty into consideration. The complex μ method is conservative in the case of the real parametric uncertainty, while in the mixed μ method, both the real parametric and the complex uncertainties are handled together. Two half-car model structures are ...

This paper presents a methodology of parametric tolerance synthesis with respect to output aleatory uncertainty specifications. It relies on density function propagation through the inverse model. The resulting parameter density function is then used to synthesize a confidence interval suitable for sizing purpose. As an illustration, parametric tolerance synthesis on a DC motor rotating a load ...

Squeezed states of the electromagnetic field are generated by degenerate parametric downconversion in a subthreshold optical parametric oscillator. Reductions in photocurrent noise greater than 60% (-4 dB) below the limit set by the vacuum fluctuations of the field are observed in a balanced homodyne detector. A quantitative comparison with theory suggests that the observed noise reductions res...

-Sufficient conditions are given under which an adaptive control system is robustly stable and achieves a guaranteed robust asymptotic performance level equal to that of the robust controller given perfect parameter information. The conditions are general in several respects. For example, structured non-parametric uncertainty (e.g. block diagonal) is allowed, as well as exogenous noise inputs. ...