The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Several non-linear systems show complex behaviors. For example, some of those plants present a high degree of oscillations throughout the time. Adaptive algorithms used to approximate such difficult neural behaviors can show important definciencies. The differential network is not an exception. Indeed, when just one neural network is applied to get an adequate approximation, the identification error...
Various studies describe the magnetic excitation generated by coils, however the electromagnetic component is present when using this type of device. For this reason, the objective of this article is to present a system of magnetic excitation of low magnitude and variable frequency that does not include the electromagnetic component.
In the context of video games design, Artificial Intelligence (AI) a broad of techniques have been used to generate the behavior of Non-Players Characters (NPC's). In this document, is explored the use of Supervisory control in Discrete Event Systems for design the behavior of NPC's, where the interaction between them it is not blocking. The modeling tool used is Interpreted Petri Nets (IPN) which...
We present the analysis of a quasi circular planar antenna for UWB applications. Analysis includes comparison of coplanar and microstrip feeding. Evolution from the circular antenna requires modifications in the structure and ground plane to soften the edges obtaining improvements in the antenna parameters agreeing with the theory proposed by John Kraus. Evolution is performed for a circular antenna...
In this work we deal with the design of archive based multi-objective evolutionary algorithms (MOEAs) for the numerical treatment of multi-objective optimization problems (MOPs). In particular, we design two generational operators-one mutation and one crossover operator-that are tailored to a class of archiving strategies and propose a new evolutionary strategy that can be viewed as a variant of ∈-MOEA,...
This paper is concerned with the exact calculus of the switching times for linear time invariant hybrid systems. We study the system's behavior that incorporates dynamical switches from a current location to another and propose an explicit procedure for a constructive treatment of the switching times. An implementable computational method elaborated in this paper makes it possible to solve the multidimensional...
This work is focused on the slipping effects analysis and the model based control of a class of biped robots over a complete walking cycle restricted to the sagittal plane. It is known that the effect of the impact of the swing leg with the walking surface produces a change in the articular velocities that forces a change on the initial conditions for the new step. Based on a simplification of the...
This article describes the design of a linear observer-linear controller-based robust output feedback scheme for output reference trajectory tracking tasks in an input delayed omnidirectional mobile robot. The unknown, possibly state-dependent, additive nonlinearity influencing the tracking error dynamics, is modeled as an absolutely uniformly bounded, additive unknown “time-varying disturbance” input...
Floating-Gate-MOS Transistor (FGMOSFET) has several applications on analog circuit design; in some cases FGMOSFET simplifies high-complexity circuits because of its inherent properties. On the other side, working with FGMOSFET on subthreshold regime has allowed non-linear function implementation such as exponential and natural logarithm functions. Moreover, working on subthreshold regime is one of...
The nonlinear interaction of space charge waves including amplification and conversion to high frequencies in n-GaN semiconductor films, possessing the negative differential conductance phenomenon, is presented. The simulation results suggest amplification and frequency multiplication for input signals with frequencies f <; 220 GHz using the balance equations model.
This paper presents a technique to solve mismatch compensation problems in current mirrors using the floating gate MOS transistor. To reduce mismatches, the tunneling and injection processes are applied in a 1.2 μm CMOS process. It takes into account the long-term voltage storage as charge on the floating gate of a transistor pMOS. Experimental results justifying these processes are also including...
p-microcrystalline-silicon/n-crystalline-silicon hetero-junction solar cell has been prepared by means of hot-wire chemical vapor deposition (HW-CVD) technique. The solar cell structure was illuminated on the opposite side of the normally-formed heterojunction. With this inverted structure, the photovoltaic cell has the design potential increasing the light-incident surface texturing and it avoids...
This paper deals with the attitude estimation of a rigid body equipped with angular velocity sensors and reference vector sensors. A quaternion-based nonlinear observer is proposed in order to fuse all information sources and to obtain an accurate estimation of the attitude. It is shown that the observer error dynamics can break up into two passive subsystems connected in “feedback”. Then, this property...
In this paper we present the 3D trapezoidal structure for analyzing FinFET MOSFETs using three different mesh regions, one at the top and two in the sidewalls of the fin, which allows the consideration of different carrier mobility at each region due to crystalline orientation and technological processing. A procedure for the extraction of the mobility parameters in each region is developed. Validation...
We report a chemical bath method to prepare ZnS thin films on glass substrates for solar applications. The proposed method is based on the experience to deposit CdS thin films by chemical bath but replacing some chemical reagents. The bath is composed of zinc chloride, potassium hydroxide, ammonium nitrate, and thiourea. During films deposition, the chemical bath is agitated with a magnetic stirrer;...
Electrical characterization of nanometric PdO films produced by thermal oxidation of Pd films in air at atmospheric pressure is reported. The PdO films were characterized using the van der Pauw-Hall method to establish the effects of oxidation degree of Pd thin films. The measured carrier mobility is directly related to the oxidation rate and film thickness. The produced films are n-type with carrier...
We analyze the State of Art in computational methods, employed for analyzing the two-dimensional Electrical Impedance Tomography problem (EIT). We broach an assortment of techniques that may be considered among the most important innovations on this area, emphasizing that the Finite Element Method has played a central role for solving the forward problem of the Electrical Impedance Equation, backbone...
In this paper, we develop an algorithm for the efficient computation of Robust Positively Invariant sets for linear discrete-time systems subject to bounded additive disturbances and polytopic input constraints. The proposed algorithm simultaneously computes both the optimal invariant set and the corresponding state-feedback control law in one step by solving a single semidefinite program. Ellipsoidal...
Thin films of CdZnS have found extensive applications in various optical, electrical and optoelectronic devices. A simple method of microwave assisted chemical bath deposition (MW-CBD) has been used to deposit CdZnS (Cadmium Zinc Sulphide) thin films. The bath solution is composed of Cadmium Sulphate, Zinc Sulphate, thiourea, ammonium Sulphate and ammonia. The concentration of bath solution is varied...
Polymerized organic thin films were synthesized on a variety of substrates by Plasma Enhanced Chemical Vapor Deposition (PECVD) technique using isopropanol as precursor. Hydrogen peroxide, ammonium hydroxide, and iodine dissolved in isopropanol were used as precursor's dopants and chlorobenzene as copolymerization precursor. The structural, optical and electrical properties of the films were studied...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.