This paper presents comparison among methods of determination of the characteristic polynomial coefficients. First, the resultant systems from the methods are compared based on frequency criteria such as the closed loop bandwidth, gain and phase margins. Then the step responses of the resultant systems are compared on the basis of the transient behavior criteria including overshoot, rise time, ...

Suction measurement has a vital role in unsaturated soil analysis. However, measuring suction remains challenging task due to number of issues such as the limited range measurement, cavitation, or long equilibrium time. It is even more when be carried on field. Hence, development new device which able measure high for duration without tedious maintenance and yet portable enough site required. I...