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We propose herein a data-driven dead-zone (DZ) compensation strategy using a model-free Virtual Reference Feedback Tuning (VRFT) approach. The VRFT tuning scheme is accommodated for two controller structures: the first one which explicitly includes a model of the DZ inverse to be identified and the second one which uses a Neural Network (NN) to model the controller to be identified. The main question...
A method for decentralized stabilization of positive descriptor linear systems is proposed. Necessary and sufficient conditions for the decentralized stabilization of the positive descriptor linear systems are established. The efficiency of proposed method is demonstrated on numerical example.
State space model of descriptor continuous-time linear system with different fractional orders is addressed. Necessary and sufficient conditions for positivity of the descriptor continuous-time linear system with different fractional orders are formulated. Decentralized controller for stabilization of the class of positive descriptor fractional systems is given. Method for finding gain matrix of the...
This paper presents a method to improve the conservative (shape-independent) controllers from guaranteed-cost LMIs using Q-learning policy iteration setups which learn optimal controllers from data. In this context, the proposed approach uses an initial parametrization based on the LMI solution and the learning process includes parameters related to the nonlinearity of the system (and its gradient)...
The purpose of this study is to design a LQR controller for the SEPIC (Single-Ended Primary-Inductor Converter) converter which is widely employed in industrial DC-DC power conversion and is also starting to see widespread use in PV applications. Circuit-Averaging-Method is used to acquire the mathematical model of the given system. Controllers are designed based on the Small-Signal model. LQR and...
This paper presents the development of an energy efficient environmental sensor that sends measurement data to a cloud platform using HTTP (Hypertext Transfer Protocol) requests. The device is based on a programmable system-on-chip (PSoC), and is equipped with a temperature and relative humidity sensor for taking measurements and with a WLAN (wireless local area network) module for sending data to...
Automatic localization of services at the time of logical modeling is a difficult task. This is because of the complexity of models and the scattered nature of enterprise architecture information in organizations, systems as well as actors and applications. However, all information about logical services is described in the eLEL and in the aspects of the business architecture of the Praxeme methodology...
In the context of an impressive development of software defined networks and of internet technologies, this paper presents the aspects related to the implementation of an online wideband multimode radio receiver. The receiver was developed considering its main application in LEO satellite data reception, for frequencies up to 1.7 GHz. In additional to the hardware implementation description, the paper...
This paper describes an RDF data model for repositories concerned with managing various aspects of the life cycle of research outputs, such as articles, data sets or learning objects. Using the figshare application as a use-case and starting from its relational model, it proposes a new mechanism for storing, enhancing and disseminating metadata, using workflows specific to the linked data ecosystem,...
Virality is a term which reflects the popularity of a certain topic or message in a social environment. Taking into account the network topology, i.e. the relational hierarchy of individuals, we propose an analysis of networks with different connectivity degrees between nodes. We model the behavior of the social network in terms of information diffusion, starting with an initially chosen source node...
In a world of the global communications, with continuous expansion to new horizons, which requires anytime and anywhere access to information sources, the need to manage the communication requirements is a very important issue. Traditional IP networks are facing difficulties in ensuring, to a user, a specific bandwidth[1] level for network access. Related to this matter, in this article we are proposing...
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