We present various comments on a question about systems over rings posed in a recent note by Sharma, proving that a ring R is pole-assignable if and only if, for every reachable system (F,G), G contains a rank-one summand of the state space. We also provide a generalization to deal with dynamic feedback.

Abstract Propagation, development of technologies and increasing customer demands switch the approach existing work in industries. To overcome barricades, six-sigma DMAIC (define, measure, analyse, improvement, control) is trendy along with being advantageous. This decreases variation set up way for gradation manufacturing companies. paper contains Six-Sigma that was used to decrease process in...

the hotelling's  control chart, is the most widely used multivariate procedure for monitoring  two or more related quality characteristics, but it’s power lacks the desired performance in detecting small to moderate shifts. recently, the variable sampling intervals (vsi) control scheme in which the length of successive sampling intervals is determined upon the preceding values has been pro...