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New function for approximating electrostatic discharge current given in IEC 61000-4-2 Standard is presented in this paper. Its parameters are determined in order to set requirements for the test generator currents. The results are compared to results of other functions from literature. The main advantage is that maximum current values and corresponding time moments are chosen in advance, and other...
This paper aims to couple analytical solution of the Pocklington integro-differential equation with stochastic techniques for the statistics of transient current flowing along horizontal grounding electrode. The electrode is excited with a current source representing a lightning strike current. This problem, as it is the case for electromagnetic compatibility (EMC) issues, is governed by many uncertain...
The homogeneous human brain dosimetry model based on the electric field integral equation (EFIE) is presented. The mathematical model is derived using the equivalence theorem and the boundary conditions for the electric field. Numerical solution of the EFIE has been carried out using the method of moments. Numerical results for the calculated equivalent surface electric and magnetic currents as well...
The performance of wireless power transfer (WPT) systems depends on antenna radiation efficiency and operating resonant frequency. In HF WPT systems, nearby objects have a certain impact on antenna characteristics and consequently on the WPT system performance. In this paper, human-WPT system interaction is investigated in order to provide basic recommendations regarding WPT system design and the...
This study gives experimental results for a rectangular microstrip patch antenna, regarding its parameters and their dependence on the substrate loss tangent. Antenna was modeled to exhibit circular polarization at two frequencies of interest: 826 MHz (a frequency in the digital dividend spectrum, mainly reserved in Europe for LTE networks) and 900 MHz (a frequency in the GSM uplink band). Experimental...
In this paper an overview of analytical solutions to the Grad-Shafranov equation for the tokamak equilibrium is given as is a short derivation of the governing equation. First, a solution to the homogeneous equation is presented. Subsequently, three analytical solutions corresponding to three different source functions are defined. Finally, some illustrative examples are given.
The paper reviews some aspects of finite element modeling of magnetohydrodynamics (MHD) phenomena for fusion related research. Thus, Grand-Shafranov Equation (GSE) for plasma equilibrium has been solved for some simple excitation forms and the obtained numerical results for the rectangular and D-shape plasma, respectively have been presented. A good agreement with already published results in relevant...
The objective of this paper is to numerically investigate novel coil designs that have an improved electric field focality compared to the standard figure-of-eight coil and other variations on such a design. The induced electric field was calculated on homogeneous conducting sphere representing a simplified head model. In the presented models, skin effect is neglected, due to the low frequencies in...
Polarization and electromagnetic properties in artificial multi-form helix structures are investigated. Four different forms of the helix core, i.e. circular, triangular, square, and hexagonal shape are studied. Based on their orientations, total inductance and capacitance are varied resulting in the shift of their resonance frequency. It is found that multi-form helices with different numbers of...
In a special case of radio technique based localization the object or person to be positioned has no active radio device (Device-free Localization). In this solution the objects can be tracked by observing the changes in radio signals of the communicating active radio elements of the detection system. The measurements have highlighted importance in the operation of this solution. Our work aimed at...
Radio Frequency IDentification (RFID) is an identification technique for storing and transferring data and it is applied for identifying and tracking tags. Our study focus on RFID tags localization by using only mobile readers without the inclusion of static readers, helps to avoid pre-deploying of static readers. We are based only on connectivity information for achieving the goal of robust 3D localization...
A web crawler is responsible for discovering new web pages on the Web as well as for refreshing the content of already downloaded pages. During these operations, it can issue a huge number of page download requests to the servers in the Web. These requests, in turn, increase the energy consumption of the servers as hardware resources are used when serving the requested pages. This has the side-effect...
Energy has become an important issue in many areas due to increasing energy costs and environmental issues. The Internet is one of the major energy consuming areas. In this paper1, we proposed an energy-aware routing and resource management model for large-scale networks by adapting an SDN (Software Defined Networking) based approach. Controller uses pre-established multi-paths (PMPs) and perform...
As the user traffic increases dramatically, wireless local area networks (WLANs) have been evolving to satisfy increasing traffic demands. IEEE 802.11ac, as the latest amendment to the family of WLAN standards, provides data rates on the order of 109. However, due to the large scale deployment of WLANs with such high speeds, their energy consumption has become a critical issue. In this paper, we present...
Sustainable networking is becoming a paradigm for cellular operators. In this work, we study the interplay between sleep modes and cellular network failure rates. In particular, we have developed a new model to compute the Base Station (BS) lifetime given the hardware (HW) and sleep mode parameters. The BS model is then extended on the entire network to compute the network lifetime. Our findings show...
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