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Wide band digitally controlled attenuator implemented in standard 130nm UMC CMOS process has been presented. Attenuator is composed of four cascade Pi-attenuation cells, and it is designed to achieve constant attenuation step size in a wide frequency range from 3.2 to 9.3 GHz.
This paper focuses to the performance analysis of three different 64-bit guest Linux FSs, ext4, xfs and btrfs, under hypervisor type-2 virtualization. Postmark and Bonnie++ benchmarks are used for generation of the testing environment. The emphasis is on the read and writes throughputs measured for different workload conditions. The experiments have indicated that ext4 file system provides the best...
This paper presents results for numerical analysis of three electrostatic problems by using four MoM (method of moments) formulations while exploiting the rotational symmetry of the analyzed structures. These results are mutually compared, but also compared to the results obtained by the electrostatic solver where rotational symmetry is not considered. It is observed that exploiting the rotational...
A software for distributed neural network training is introduced here. The introduced software named NeuralGenesis implements a client — server model for parallel genetic algorithms with custom features such as: an enhanced stopping rule, an advanced mutation scheme and periodical application of a local search procedure. The software is coded in Qt5 for portability reasons and it is freely available...
High definition video streams increase their Internet presence year over year. Therefore, they are starting to challenge network resource allocation with their bandwidth requirements and statistical characteristics. In this paper, we apply a seasonal autoregressive model for modeling and prediction of 4K video traffic, encoded with H.265 (HEVC) encoding standard. The obtained experimental results...
Our paper presents the simulation results for the one-dimensional virtual cathode oscillator problem solved in terms of computational physical kinetics. Current classical problem of the electron beam injection into vacuum equipotential gap has been solved for the first time using the approach based on accurate numerical solution of Vlasov-Poisson system. We also provide the comparison of obtained...
In this paper, novel convergence accelerating techniques are adapted onto the proposed hyperbolic numerical inverse Laplace transform method (hyperbolic-NILT) and analyzed. This ID NILT method is based on the approximation of the inverse kernel of the Laplace transform Bromwich integral exp(st). It is shown that with the use of the convergence accelerating algorithms onto the essence of the proposed...
The aim of this paper is to present a development and an implementation of a tracking algorithm for Over-The-Horizon Radar (OTHR) with surface wave propagation. Proposed implementation utilizes standard tracking algorithm design for OTHR and introduces modifications of Joint Probability Data Association (JPDA) algorithm in order to simplify processing. To justify chosen approach, a simulated environment...
The modern direction finders (DF) are able to process the frequency band that is much wider than usual signal spectrum. Therefore, as several radio transmitters can be active in the observed frequency range, a further assessment of the active transmitter number as well as their parameters is needed. This additional processing is labeled as spectrum segmentation or preclassification. This paper discusses...
Due to the inherent limitations of the sensor nodes (SNs) and the distributed nature of information in wireless sensor networks (WSNs), energy efficient routing protocols have received significant research attention. Hierarchical routing based on clustering have been proven to be an effective method for energy-efficiency. Moreover, the presence of heterogeneous nodes with varied initial energies can...
The hierarchical routing protocols are considered as a suitable and energy efficient for wireless sensor networks applications that demand frequent and periodic data gathering. Many routing protocols for two-layer (single-hop), tree-layer (dual-hop) and multiple-layer (multi-hop) architectures are developed based on the hierarchical LEACH protocol. In this paper we propose a novel concept for the...
Cognitive Radio has now become a realistic option for the solution of the spectrum scarcity problem in wireless communication. TV channels (primary user) can be protected by accurate prediction of TV White Spaces (TVWS) by using propagation models. Knowledge of radio propagation is considered essential in any wireless network, with dependence on appropriate deployment and management strategies leading...
Biological neural communication network continuously gathers information about the internal state of the organism and its external environment, processes and evaluates this information to eventually coordinate activities of “end devices”, e.g., muscle cells. All activities, i.e., voluntary and involuntary actions of the body, the causes of mental disorders, and any other function or dysfunction of...
Alternative orthogonal vector basis functions, that of Dini-type, are presented in this work, and used for solving volume integral equations. The special property of this basis is that it allows the transformation of the original volume integral equation to algebraic sets of equations. This feature is achieved by constructing orthogonal properties in the domain of inhomogeneity of the object. This...
In this paper we present a full-scale multimode rate equation model of an injection-locked Fabry-Pérot semiconductor laser, analyze its stability and present new stability map. We recognize the region of the dispersive bistability, and within this region, we propose two optical switching methods, which could be employed in the realization of an all-optical flip-flop. We analyze switching times and...
A summery review of several topics in higher order computational electromagnetic (CEM) are presented. First, constant speed parametrization (CSP) mapping between the parent and the final computational domain is presented. Next, we construct, numerically model, and analyze transformation-based metamaterial invisibility cloaks. These cloaks are continuously inhomogeneous and anisotropic. Finally, we...
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