Information-theoretic fundamental limitation in feedback control system is an important topic for decades. In this paper, a new bode-like fundamental inequality in causal feedback control system is developed. This inequality relates directed information, mutual information and bode sensitivity functions. This inequality recovers previous known results in feedback system as special cases.

Abstract—A simple design for realizing a Bode-type amplitude equalizer is proposed. It allows any arbitrary, but RC realizable, shaping function and whole range. The Bode-type amplitude equalizer using current feedback amplifier is derived which can operate satisfactory at much higher frequencies compared to the operational amplifier based ones. Simulation results are in good agreement with the...

BACKGROUND The association between disease markers and health status (HS) overtime is unclear. The aim of this study was to verify the predictors of HS at baseline and after three years in Chronic Obstructive Pulmonary Disease (COPD) patients. METHODS Ninety-five consecutive COPD patients (66% male, age = 67 ± 9 y, FEV1 = 58 ± 23%) underwent the following evaluations at baseline and after thr...

OBJECTIVE To determine if there is a correlation between the BODE Index and variables assessed during the Activities of Daily Living assessment, performance on lower limber tests, and peripheral muscle impairment of the upper limb in patients with chronic obstructive pulmonary disease. MATERIALS AND METHODS Ten men (aged 58 to 80 years old) with moderate to very severe obstruction were evalua...