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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...
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...
The paper presents a designed, implemented and tested application intended to evaluate the level of attention to people who perform activities that require a high level of concentration, using a measurement system in one point of the electroencephalographic signal. The paper presents the hardware and software structure that highlights the advantages of the system.
As the number of satellites orbiting around the Earth is significantly increasing, it is important to extend the ground station network, in order to be able to receive as much of the satellite transmitted data. In this context, this paper addresses the aspects related to the implementation of a ground station for LEO satellites, located in Suceava city, focusing on the analysis of the reference antenna's...
In the context of an increasing number of satellites orbiting around the Earth, developing a vast ground stations network becomes very important in order to be able to receive the satellite transmitted data. Consequently, this paper presents the aspects related to the implementation of a ground station for LEO satellites, located in Suceava city. The paper presents a relatively simple and cost efficient...
Cloud computing technology knows a continuous growth in the past years. The growth of cloud computing generated in most situations to inefficient energy usage for storage, data processing, and network communications. The consumption of electrical energy generates at the end carbon emissions known also as carbon footprints. The eco-friendly cloud computing purpose is to decrease the carbon footprint...
Given the growing demands for network services based sometimes on reduced resources, efficient solutions are continuously developed in order to operate the network infrastructures in optimum conditions. From network management viewpoint, the main challenge is related to traffic management solutions using data flow limitations for some specific users while giving higher priorities to others. If for...
The video, voice, multimedia next-generation applications are using real-time data transmissions. Therefore, taking into account that all these applications are transmitted “over IP”, variable bandwidth has to be provided for specific situations in order to prevent network congestion. The active equipments meet these requirements and provide the network management. However, how will it be if the network...
Since the data transmission networks require different bandwidth for simultaneous transmission of data, the new generation of network equipment use technologies that ensure QoS (Quality of Service) control services integrated data, video, voice and multimedia. This paper, demonstrate the test evaluation possibility of QoS parameters in a switch and the bandwidth limitation.
It is well known that the performance of wireless communication are quite sensitive to channel conditions and the transfer data rates are declining as the distance between the communicating peers is increased. In this paper are presented a set of results from a performance evaluation study of wireless communication based on the IEEE 802.11ac standard. The measurements were made between a pair of wireless...
Supply of an induction machine with two frequencies in stator is a method of thermic verification (Ytterberg) for factories. For establishing the most suitable values for voltages and frequencies of two sources, a detailed analysis of the corresponding electric and magnetic stresses of induction machine is necessary. The simulations provide detailed coherent information, difficult or impossible to...
The paper presents a new type of actuator consisting of a flat stator, above which a rigid disk-shaped rotor, without windings is placed. Between the rotor and each enabled stator winding, an electromagnetic force is generated, which causes the rotor inclination change in the direction of activated pole. Successive stator winding-switching leads to the change of the contact point position between...
In this study, brain, and gait dynamic information were combined and used for diagnosis and monitoring of Parkinson's disease (the most important Neurodegenerative Disorder). Analysis of the information corresponding to a prescribed movement involving tremor, and the related changes in brain connectivity is novel and original. Analytically, developing a space-time nonlinear adaptive system which fuses...
Parkinson's disease is the most common degenerative movement disorder and a progressive nervous system disorder that affects body movement, memory, speaking and daily mental and physical activities. In Romania are over 75.000 Parkinson patients and the government spends over 1.5 million USD with them. Nowadays, there is no screening test for early detection of Parkinson's disease. In this paper is...
The traditional method used to detect and localize power quality disturbances by Fast Fourier Transform (FFT) can provide only amplitude — frequency information, but looses time information. In evaluating power supply quality, the FFT-based indices present different limitations. This paper proposes a set of four indices based on Discrete Wavelet Transform (DWT), such as total harmonic distortion,...
The common method used for power quality disturbances detection, represented by the Fast Fourier Transform (FFT) can provide amplitude-frequency information but looses time information. A more efficient tool is considered Discrete Wavelet Transform (DWT) that can be also applied to unbalanced three-phase systems with nonlinear loads, in non-sinusoidal conditions. It also analyses the signal in a time-frequency...
This paper presents our vision on developing a software tool for modeling and simulating the intelligent behavior of the future power grid. Modeling approaches based on function blocks and holonic concepts are proposed for the intelligent control entities, designed to interact with each other to optimize the operation of the grid in relation to the distribution of power, integration of equipment and...
Since IANA's IPv4 address pool had run out in 2011, the new Internet Protocol version 6 has been widely deployed in the world. Although IPv6 has many improvements compared to IPv4, it still lacks the possibility to authenticate each packet, making it vulnerable for attacks. In the present article we investigate the efficiency and resources used by Source Address Validation Implementation (SAVI), a...
Based on Fast Fourier Transform (FFT), power quality indices (PQIs) definitions contained in the standards cannot be successfully applied for non-stationary signals analysis in unbalanced three-phase systems with non-sinusoidal conditions. Unlike FFT, Discrete Wavelet Transform (DWT) gives more accurate definitions preserving time-frequency information and reduces the computational effort. This paper...
Power Quality (PQ) evaluation for electric power system waveforms is realised using the harmonic analysis. The definitions of power-quality indices (PQIs) contained in the standards are based on the Fast Fourier Transform, which provides only an amplitude-frequency spectrum loosing time-related information. This paper proposes the reformulation of the PQIs definitions using Discrete Wavelet Transform...
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