The increase in aerial storage capacities of future magnetic hard disk drives has fostered the use of dual-stage actuators for high track density data recording. In a hard disk drive with a dual-stage actuator the standard rotary actuation of the voice coil motor is combined with an additional micro or milli actuation to accomplish high-bandwidth and highly accurate track following. In order to...

The hybrid solution to the pendulum swinging-up and stabilizing problem introduced by Åström and Furuta is based in two steps: an energy injection and a linear stabilization around the desired inverted position. However the energy injection stage only considers the pendulum, and not the motion of the pivot. Furthermore, for the stabilization stage linear law, only a very small basin of attracti...

This chapter illustrates the identi cation of control-relevant models and the subsequent robust control design applied to a wafer stage. A wafer stage is part of a wafer stepper and used in chip manufacturing processes for accurate positioning of the silicon wafer on which the chips are to be produced. Accurate and fast positioning requires a robust and high-performance multivariable servo cont...

In this paper, a novel approach is presented to fine tune a direct fuzzy controller based on very limited information on the nonlinear plant to be controlled. Without any off-line pretraining, the algorithm achieves very high control performance through a two-stage algorithm. In the first stage, coarse tuning of the fuzzy rules (both rule consequents and membership functions of the premises) is...

We indicate how to fix an error in the proof of the main theorem of our original paper, pointed out to us by Yong Liu and Keng Meng Ng. The main result of our paper [1] read as follows: Main Theorem. There is an incomplete d.c.e. degree maximal in the n-c.e. degrees (for all n ≥ 2) as well as in the ω-c.e. degrees. Thus the n-c.e. degrees (for n ≥ 2) and the ω-c.e. degrees are not dense. The er...

The shift from a fossil-fuel to a hydrogen based transportation system requires sufficient supporting infrastructures. This paper develops a real option model to investigate the value of this investment opportunity which is able to handle the multiple uncertainties from market, political and technological aspects. The uncertain market and political uncertain factors will be transformed into a p...

In this paper, we present a simple implementation of an ambulance robot controller. The responsibility of the ambulance in the system is to transport dead robots from their current location to a nearby charging station. This helps in solving the problem of having dead robots in the environment resulting in a more robust and autonomous system. Results from a simulated MedBot controller indicate ...

The web based learning has become more complex to search required learning resources with continuously growing digital learning contents which are entangled with structural and semantic interrelationship. Meanwhile, the rapid development of communication technology lead to heterogeneity of learning devices than it was in the early stage. The context-aware adaptive learning environment has becom...

In front wheels driven vehicles, fuel economy can be obtained by summing torques applied to rear wheels. On the other hand, unequal torques applied to rear wheels provides enhanced safety. In this paper, a model with seven degrees of freedom is considered for the vehicle body. Thereafter, power-train subsystems are modeled. Considering an electrical machine on each rear wheel, a fuzzy controlle...

The paper combines two major neuro-fuzzy applications in power engineering: stabilizing power systems at a generation stage and reducing disturbances at a delivery stage. It presents a neural-fuzzy classifier for recognition of power disturbances and a fuzzy excitation controller comprising both the exciter and the power system stabilizer.