Many PID controller tuning methods have been presented since Ziegler and Nichols published their method in 1942, but none of those methods were used widely. The Ziegler and Nichols method has several advantages over newer methods: it is easy to conduct, the relations for controller parameter computation are simple, the method relies on experiment, and it does not require any model. Newer tuning...

Ultrasound acquisition is a challenging task that requires simultaneous adjustment of several acquisition parameters (the depth, the focus, the frequency and its operation mode). If the acquisition parameters are not properly chosen, the resulting image will have a poor quality and will degrade the patient diagnosis and treatment workflow. Several hardware-based systems for autotuning the acqui...

. A set of different versions of the Swedish folk-tune "Fiskeskarsvisan" collected by Moberg i s studied a s regards the question why they a r e felt to be melodically similar. The observations of common elements made in an analysis of the melodies a r e integrated into a rule system by means of which new versions of the folk-tune can be generated. The rule system shows that signaling the const...

While adaptive control has been used in numerous applications to achieve given system stabilization or command following criteria, the ability to obtain a predictable transient performance is a challenging problem when there is no a priori knowledge about system uncertainties (e.g., their upper bounds and/or domains). In order to address this problem, a new method is presented in [1, 2] utilizi...

This paper presents a method for speech analysis/synthesis/ conversion by using sequential processing. The aims of this method are to improve the quality of synthesized speech and to convert the original speech into another speech of different characteristics. We apply the Kalman Filter for estimating the auto-regressive coefficients of ‘time varying AR model with unknown input (ARUI model)’, w...

In this paper we will present part of the work carried out by CINECA in the framework of the PRACE-2IP project aimed to study the effect on performance due to the implementation of a 2D Domain Decomposition algorithm in DFT codes that use standard 1D (or slab) Parallel Domain Decomposition. The performance of this new algorithm are tested on two example applications: Quantum Espresso, a popular...

Coherent modes which are present when there is no incoherent tune spread may be absent when such a spread exists. Such modes are “Landau damped.” There is instead an incoherent spectrum, a continuum of an infinite number of frequencies, which will decohere (filament), thus not leading to collective instabilities. A stability diagram indicates when Landau damping will be effective. It divides th...

“Factory”-like e+-e– colliders presently under design or construction achieve high luminosity by resorting to large numbers of closely-spaced bunches. The short bunch spacing implies that there are unavoidable parasitic collisions (PCs) in the neighborhood of the interaction point (IP). Since the bunch population of the beam is not uniform due to an intentional ion-clearing gap, the bunches at ...

The PEP-II B-Factory achieved design performances in 2000. The tune shifts of the rings are already about twice the design numbers of 0.03. This requires constant adjustments from the operators during fills and top-offs. A tune feedback was envisioned first, but the wide, multi-peaked tune signals make it tricky even for a human to adjust the tunes correctly. Since tunes are strongly correlated...