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A specialized hardware architecture to permit a real time visual navigation is proposed. The navigation is performed by a two-stage approach to extract visual features and to match them over an image sequence acquired during the mobile robot motion in order to estimate motion parameters. The paper describes a hardware implementation of the first stage (the burdensome stage) of the method for egomotion...
The recent laboratory tests are showing progresses in both materials and production technology of Photo-Voltaic (PV) modules, nevertheless their efficiency yet results relatively low. Moreover, efficiency is also a very critical issue for already installed PV modules, because they were produced employing a less performing technology. In this scenario, a diagnostic approach able to check the current...
The paper deals with the reduction of the channel outage in a smart grid scenario since it plays a crucial role on the control performance of the Demand/Response Management. A study on a two-way cognitive-based switching procedure is carried out and tools for the optimum sensing-time evaluation are provided. Such evaluation considers a cost function that takes into account both the sensing-accuracy...
Highly automated production systems are conceived to efficiently handle evolving production requirements. This concerns any level of the system from the configuration and control to the management of production. The proposed work deals with the development of an innovative platform jointly managing the production scheduling level and the automation level. The major advantage coming from the platform...
In this paper we present a patented sensor devoted to the high precision 3D omnidirectional reconstruction. This sensor is based on the profilometer approach, but exploits a catadioptric system to get a very large field of view. After a theoretical presentation of the sensor's functionality and an analysis on its sensitivity, a designing strategy has been defined. Indoor and outdoor environmental...
Wide field of view 3-D scanners are strategic in many contexts, above all, infrastructure inspection and vehicle/robot automatic motion. In this paper we present a patented sensor able to recover three-dimensional data and perform an omnidirectional highly accurate environmental reconstruction, mainly focusing on a design strategy for setting up the geometric parameters. Performance of a prototypal...
Multiphase interleaved buck converters are widely used for point of load applications, especially for VRMs. Performance optimization issue often clashes with size and cost requirements thus leading the industrial and academic research to focus on advanced solutions. This paper presents a control technique for multiphase VRMs including two interacting sections: the linear loop implements a PWM peak...
Fuel cell based systems are usually tested with the aid of high-cost and complex auxiliary devices. A fuel cell emulator is an attractive solution for preliminary downward system test. The emulator replaces the effective power source saving cost, volume and hydrogen reserve still ensuring high-accuracy of test results. The use of a high-performance fuel cell model is essential for a successful conclusion...
Today, academic and industrial research is addressed to fuel cell based hybrid power supply in many fields of applications including stationary, automotive and portable electronics. Increasing source runtime, speeding up the transient response while minimizing weight, volume and cost of the power supply system are key requirements of all applications. According to the particular application, the power...
We demonstrate experimentally and theoretically the existence of slow chaotic spiking sequences in the dynamics of semiconductor devices (lasers and LED) with ac-coupled optoelectronic feedback. We eventually show that this regime is the result of an incomplete homoclinic scenario to a saddle-focus, where an exact homoclinic connection does not occur. The synchronization scenarios have been fully...
This paper addresses the de-embedding of the propagation function of waveguides from the scattering responses of setups composed of TEM waguides terminated by launchers that introduce generic discontinuities. The de-embedding is aimed at estimating the permittivity of dielectric samples from the scattering responses of waveguides including the samples. The de-embedding is based on the double-delay...
The railway maintenance is a particular application context required in order to prevent any dangerous situation. With the growing of the high-speed railway traffic, automatic inspection systems able to detect rail defects, sleepers' anomalies, as well as missing fastening elements, become strategic since they could increase the ability in the detection of defects and reduce the inspection time in...
Regardless of the feedback control, almost all converters require input or output current sense for over-current protection. If a current mode control is implemented, high accuracy is also required. The optimal current sensing method shows the highest accuracy and the lowest power dissipation. In this paper, a lossless and accurate current sensing technique for Flyback converters is proposed. An RC...
In the last few years fuel cells have attracted much interest from both academic and industrial researchers to replace current lithium-ion and similar rechargeable battery systems. A wide variety of research areas benefit from fuel cell use: electro-chemical, stationary, transportation and portable electronics can be cited as an example. Potential applications range from few watts to megawatts systems...
The mechanical interaction of light with small but macroscopic oscillators, mediated by radiation pressure, has been investigated since the '70ies. Several theoretical studies have proposed schemes exploiting such interaction at the quantum level. The phenomena analyzed include pondero-motive squeezing, quantum non-demolition measurements, entanglement between radiation field and mechanical oscillators...
Today, the consumer market calls for high-performance power supply systems. Existing sources and technologies are not abreast of portable electronics trends, thus pressing both the academic and industrial research to focus on innovative technologies. Customers' requirements lead to a growing interest in longer-lasting power, fast transient response power supply systems and a minimization of system...
A fuel cell-supercapacitor hybrid power supply for portable applications is designed. To ensure system level simulation, each component is accurately modelled and simulation results are reported. A digital still camera is selected as specific load device, although the choice of a specific application does not influence the proposed control technique performances but only dictates the power supply...
Due to the increasing number and complexity of the available functions, modern hand-held devices require higher and higher current slew rates. Customerspsila requirements lead to a growing interest in longer-lasting power, fast transient response power supply systems and minimization of system weight, volume and cost. Fuel cell based hybrid systems are designed to meet all requirements. In this paper,...
Today academic and industrial research is addressed on fuel cell based power supply to replace current lithium-ion and similar rechargeable battery systems. For system simulation, fuel cell models are developed. Even if power electronics designers demand for a black-box model to limit the knowledge of physical and chemical parameters, high performance in terms of model accuracy and portability is...
Load modelling is essential to simulate system features as closely as possible to the effective behaviour. In spite of model complexity, the need for accuracy often leads to a component-based approach, i.e. the analysis of load internal subsystems. It is a common belief that measurement-based load models lead to low accuracy. This paper presents a new, high-accuracy measurement-based load modelling...
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