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The paper proposes Markov models for the reliability analysis of the wireless sensor networks. There are presented the theoretical aspects and some of the variables that are used in the domain of fault tolerant systems. There is also presented a comparison between systems using dedicated replacements and universal replacements for defective nodes. There has(More)
The wind energy conversion systempsilas (WECS) analysis requires the priory knowledgepsilas regarding the mathematical models for all component subsystems. The paper highlights some contributions to the preset values establishing strategies and models of certain components: rotation speed and voltage preset values establishing strategies, a simplified wind(More)
This paper presents a comparative study between an adaptive fuzzy controller and an adaptive self-tuning controller with application to excitation control of a synchronous generator. The adaptive self-tuning controller is based on a dual action, obviously on control input, and also on reference signal. The proposed adaptive fuzzy controller includes a(More)
This paper presents the implementation of a neural network-based fault detection for wireless sensor networks (WSNs). There are discussed two proposed approaches: both a centralized and respectively distributed fault detection. The methods are validated using a wireless sensor network that takes environmental measurements every 60 seconds. There were(More)
An adaptive self-tuning control solution is exposed in this paper. The control strategy is to minimize a cost function, which incorporates fluctuations of input, output and set point with the system-identified parameters. The designed control strategy proposes to remove the internal integrator component from the adaptive control law (which is inappropriate(More)
In some cases of software-distributed applications, a large data amount must be accessed by a large number of users (dispersed geographically). In these cases, the database replication process provides an efficient solution to increase the application performances. This paper presents two methods to implement a multi-master database replication process. A(More)
The paper presents a control strategy for a wind energy conversion system (WECS) for an optimal extraction of power from the wind. The topology of the system consists of a permanent magnet synchronous generator (PMSG), a diode bridge rectifier, a hybrid dc-dc converter which lowers the dc voltage, a supercapacitor and an inverter. However, the grid side(More)
The present paper presents a solution for prolonging the battery life for motes within a wide-area wireless sensor network (WSN). In this particulars networks, the distances between motes and base stations are over the motepsilas communication range, and motes located between sinks and base station are commonly used both as regular motes and repeaters. This(More)
The paper establishes a preliminary pragmatic method to obtain the control strategy of an innovative small windgenerator prototype. There is presented the proposed structure of the considered wind energy conversion system, respectively its components and subsystems. There were considered the wind turbine, the generator, the electronic converters, the brake(More)