This paper presents a simple, but effective, design method for decentralized PI control systems with guaranteed closed-loop stability. Nyquist stability conditions are used to derive the stability region for each PI controller in terms of the controller parameters. A detuning factor for each loop is specified based on a diagonal dominance index. Then appropriate controller settings are determin...

The usefulness and applicability of water indices such as Langelier saturation index, Ryznar stability index and Practical scale index for predicting the corrosive/scale forming tendency of chemically treated open recirculating cooling water has been studied. The study is based on the obtained corrosion and scale data for the period from May 1998 to December 2007, carried out at Fast Breeder Te...

[Purpose] The purpose of this study was to investigate the effects of six weeks of visual biofeedback training for prevention of falling in the elderly. The Tetrax system was used for visual biofeedback training. [Subjects and Methods] Thirty elderly persons (experimental group=15, control group=15) who were above 70 and under 80 years of age participated in biofeedback training. They were trai...