Umgekehrt Proportional

Proportional Control

'Nothing like the human hand' [1] is the title of Boivin's 1968 article reviewing current research and development in prosthetic hands at that time. This title holds true even today although technological advances have allowed amputees access to componentry offering greater function, cosmesis and efficiency of control. Childress also reminds us that hand replacement by means of prosthetic inter...

Proportional Rankings

In this paper we extend the principle of proportional representation to rankings. We consider the setting where alternatives need to be ranked based on approval preferences. In this setting, proportional representation requires that cohesive groups of voters are represented proportionally in each initial segment of the ranking. Proportional rankings are desirable in situations where initial seg...

Model Diagnostics for Proportional and Partial Proportional Odds Models

A Chaos-Based Communication Scheme Using Proportional and Proportional-Integral Observers

In this paper, we propose a new chaos-based communication scheme using the observers. The novelty lies in the masking procedure that is employed to hide the confidential information using the chaotic oscillator. We use a combination of the addition and inclusion methods to mask the information. The performance of two observers, the proportional observer (P-observer) and the proportional integra...

Anti-windup Schemes for Proportional Integral and Proportional Resonant Controller

Problems like windup or rollover arise in a PI controller working under saturation. Hence antiwindup schemes are necessary to minimize performance degradation. Similar situation may occur in a Proportional Resonant (PR) controller in the presence of a sustained error input. Several methods can be employed based on existing knowledge on PI controller to counter this problem. In this paper few su...