Rok 2021

• Enhancing Resilience of FSO Networks to Adverse Weather Conditions

  Publikacja

  • I. Kalesnikau
  • M. Pióro
  • J. Rak
  • H. Ivanov
  • E. Fitzgerald
  • E. Leitgeb

  - IEEE Access - Rok 2021

  Optical wireless networks realized by means of gigabit optical wireless communication (OWC) systems are becoming, in a variety of applications, an important alternative, or a complementary solution, to their fiber-based counterparts. However, performance of the OWC systems can be considerably degraded in periods of unfavorable weather conditions, such as heavy fog, which temporarily reduce the effective capacity of the network....

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• Explicit Size-Reduction of Circularly Polarized Antennas through Constrained Optimization with Penalty Factor Adjustment

  Publikacja

  • M. Mahrokh
  • S. Kozieł (dawniej: M. Kozieł)

  - IEEE Access - Rok 2021

  Modern communication systems of high data capacity incorporate circular polarization (CP) as the preferred antenna radiation field configuration. In many applications, integration of the system circuitry with antennas imposes size limitations on CP radiators, which makes their development process a challenging endeavor. This can be mitigated by means of simulation-driven design, specifically, constrained numerical optimization....

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• Highly Miniaturized Self-Diplexed U-Shaped Slot Antenna Based on Shielded QMSIW

  Publikacja

  • R. Barik
  • S. Kozieł
  • Q. Cheng
  • S. Szczepański

  - IEEE Access - Rok 2021

  This article presents an efficient yet simple design approach to highly miniaturized cavity-backed self-diplexing antenna (SDA) with high-isolation. The structure employs a shielded quarter-mode substrate integrated waveguide (QMSIW). Two U-shaped slots are engraved on the top conducting plane, which realize two frequency bands and significant size reduction. The slots are excited by two independent 50Ω orthogonal feed-lines to...

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• High-Power Jamming Attack Mitigation Techniques in Spectrally-Spatially Flexible Optical Networks

  Publikacja

  • G. Savva
  • K. Manousakis
  • J. Rak
  • I. Tomkos
  • G. Ellinas

  - IEEE Access - Rok 2021

  This work presents efficient connection provisioning techniques mitigating high-power jamming attacks in spectrally-spatially flexible optical networks (SS-FONs) utilizing multicore fibers. High-power jamming attacks are modeled based on their impact on the lightpaths’ quality of transmission (QoT) through inter-core crosstalk. Based on a desired threshold on a lightpath’s QoT, the modulation format used, the length of the path,...

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• Improved Modeling of Microwave Structures Using Performance-Driven Fully-Connected Regression Surrogate

  Publikacja

  • S. Kozieł
  • P. Mahouti
  • N. Calik
  • M. Belen
  • S. Szczepański

  - IEEE Access - Rok 2021

  Fast replacement models (or surrogates) have been widely applied in the recent years to accelerate simulation-driven design procedures in microwave engineering. The fundamental reason is a considerable—and often prohibitive—CPU cost of massive full-wave electromagnetic (EM) analyses related to solving common tasks such as parametric optimization or uncertainty quantification. The most popular class of surrogates are data-driven...

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• Instructor Presence in Video Lectures: Preliminary Findings From an Online Experiment

  Publikacja

  • Y. Y. Ng
  • A. Przybyłek

  - IEEE Access - Rok 2021

  Motivation. Despite the widespread use of video lectures in online and blended learning environments, there is still debate whether the presence of an instructor in the video helps or hinders learning. According to social agency theory, seeing the instructor makes learners believe that s/he is personally teaching them, which leads to deeper cognitive processing and, in turn, better learning outcomes. Conversely, according to cognitive...

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• Mapping of the Covid-19 Vaccine Uptake Determinants From Mining Twitter Data

  Publikacja

  • A. Baj-Rogowska

  - IEEE Access - Rok 2021

  Opinion polls on vaccine uptake clearly show that Covid-19 vaccine hesitancy is increasing worldwide. Thus, reaching herd immunity not only depends on the efficacy of the vaccine itself, but also on overcoming this hesitancy of uptake in the population. In this study, we revealed the determinants regarding vaccination directly from people’s opinions on Twitter, based on the framework of the 6As taxonomy. Covid-19 vaccine acceptance...

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• Mining inconsistent emotion recognition results with the multidimensional model

  Publikacja

  • A. Landowska
  • T. Zawadzka
  • M. Zawadzki

  - IEEE Access - Rok 2021

  The paper deals with the challenge of inconsistency in multichannel emotion recognition. The focus of the paper is to explore factors that might influence the inconsistency. The paper reports an experiment that used multi-camera facial expression analysis with multiple recognition systems. The data were analyzed using a multidimensional approach and data mining techniques. The study allowed us to explore camera location, occlusions...

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• Non-Satellite Broadband Maritime Communications for e-Navigation Services

  Publikacja

  • M. Hoeft
  • K. Gierłowski
  • J. Rak
  • J. Woźniak
  • K. Nowicki

  - IEEE Access - Rok 2021

  The development of broadband network access technologies available to users on land has triggered a rapid expansion of a diverse range of services provided by terrestrial networks. However, due to limitations of digital communication technologies in the off-shore area, the maritime ICT systems evolution so far has not followed that trend. Despite the e-navigation initiative defining the set of Maritime Services, the progress in...

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• On Decomposition-Based Surrogate-Assisted Optimization of Leaky Wave Antenna Input Characteristics for Beam Scanning Applications

  Publikacja

  • M. Belen
  • P. Mahouti
  • S. Kozieł
  • A. Caliskan
  • S. Szczepański (dawniej: J. Szczepański)

  - IEEE Access - Rok 2021

  Recent years have witnessed a growing interest in reconfigurable antenna systems. Travelling wave antennas (TWAs) and leaky wave antennas (LWAs) are representative examples of structures featuring a great level of flexibility (e.g., straightforward implementation of beam scanning), relatively simple geometrical structure, low profile, and low fabrication cost. Notwithstanding, the design process of TWAs/LWAs is a challenging endeavor...

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• On EM-driven size reduction of antenna structures with explicit constraint handling

  Publikacja

  • A. Pietrenko-Dąbrowska (dawniej: S. Kozieł)
  • S. Kozieł

  - IEEE Access - Rok 2021

  Simulation-driven miniaturization of antenna components is a challenging task mainly due to the presence of expensive constraints, evaluation of which involves full-wave electromagnetic (EM) analysis. The recommended approach is implicit constraint handling using penalty functions, which, however, requires a meticulous selection of penalty coefficients, instrumental in ensuring optimization process reliability. This paper proposes...

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• Ontological Model for Contextual Data Defining Time Series for Emotion Recognition and Analysis

  Publikacja

  • T. Zawadzka
  • W. Waloszek
  • A. Karpus
  • S. Zapalowska
  • M. Wróbel

  - IEEE Access - Rok 2021

  One of the major challenges facing the field of Affective Computing is the reusability of datasets. Existing affective-related datasets are not consistent with each other, they store a variety of information in different forms, different formats, and the terms used to describe them are not unified. This paper proposes a new ontology, ROAD, as a solution to this problem, by formally describing the datasets and unifying the terms...

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• Rapid Multi-Criterial Antenna Optimization by Means of Pareto Front Triangulation and Interpolative Design Predictors

  Publikacja

  • S. Kozieł
  • A. Pietrenko-Dąbrowska

  - IEEE Access - Rok 2021

  Modern antenna systems are designed to meet stringent performance requirements pertinent to both their electrical and field properties. The objectives typically stay in conflict with each other. As the simultaneous improvement of all performance parameters is rarely possible, compromise solutions have to be sought. The most comprehensive information about available design trade-offs can be obtained through multi-objective optimization...

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• Reduced-Cost Microwave Design Closure by Multi-Resolution EM Simulations and Knowledge-Based Model Management

  Publikacja

  • S. Kozieł
  • A. Pietrenko-Dąbrowska
  • P. Płotka

  - IEEE Access - Rok 2021

  Parameter adjustment through numerical optimization has become a commonplace of contemporary microwave engineering. Although circuit theory methods are ubiquitous in the development of microwave components, the initial designs obtained with such tools have to be further tuned to improve the system performance. This is particularly pertinent to miniaturized structures, where the cross-coupling effects cannot be adequately accounted...

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• Reinforcement Learning Algorithm and FDTD-based Simulation Applied to Schroeder Diffuser Design Optimization

  Publikacja

  • A. Kurowski
  • B. Kostek

  - IEEE Access - Rok 2021

  The aim of this paper is to propose a novel approach to the algorithmic design of Schroeder acoustic diffusers employing a deep learning optimization algorithm and a fitness function based on a computer simulation of the propagation of acoustic waves. The deep learning method employed for the research is a deep policy gradient algorithm. It is used as a tool for carrying out a sequential optimization process the goal of which is...

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• Reversible Data Hiding in Encrypted DICOM Images Using Cyclic Binary Golay (23, 12) Code

  Publikacja

  • M. Dzwonkowski
  • R. Rykaczewski

  - IEEE Access - Rok 2021

  In this paper, a novel reversible data hiding method for encrypted images (RDHEI) is proposed. An efficient coding scheme based on cyclic binary Golay (23, 12) code is designed to embed additional data into the least significant bits (LSBs) of the encrypted image. The most significant bits (MSBs) are used to ensure the reversibility of the embedding process. The proposed scheme is lossless, and based on the receiver’s privileges,...

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• Robot-Based Intervention for Children With Autism Spectrum Disorder: A Systematic Literature Review

  Publikacja

  • K. D. Bartl-Pokorny
  • P. Uluer
  • D. E. Barkana
  • A. Baird
  • H. Kose
  • T. Zorcec
  • B. Robins
  • B. Schuller
  • A. Landowska
  • M. Pykała

  - IEEE Access - Rok 2021

  Children with autism spectrum disorder (ASD) have deficits in the socio-communicative domain and frequently face severe difficulties in the recognition and expression of emotions. Existing literature suggested that children with ASD benefit from robot-based interventions. However, studies varied considerably in participant characteristics, applied robots, and trained skills. Here, we reviewed robot-based interventions targeting...

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• Simulator for Performance Evaluation of ASON/GMPLS Network

  Publikacja

  • S. Kaczmarek
  • M. Młynarczuk

  - IEEE Access - Rok 2021

  The hierarchical control plane network architecture of Automatically Switched Optical Network with utilization of Generalized Multi-Protocol Label Switching protocols is compliant to next generation networks requirements and can supply connections with required quality of service, even with incomplete domain information. Considering connection control, connection management and network management, the controllers of this architecture...

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• Supervised Classification Problems–Taxonomy of Dimensions and Notation for Problems Identification

  Publikacja

  • I. Czarnowski
  • P. Jedrzejowicz

  - IEEE Access - Rok 2021

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• Surrogate-Assisted Design of Checkerboard Metasurface for Broadband Radar Cross-Section Reduction

  Publikacja

  • M. Abdullah
  • S. Kozieł

  - IEEE Access - Rok 2021

  Metasurfaces have been extensively exploited in stealth applications to reduce radar cross section (RCS). They rely on the manipulation of backward scattering of electromagnetic (EM) waves into various oblique angles. However, arbitrary control of the scattering properties poses a significant challenge as a design task. Yet it is a principal requirement for making RCS reduction possible. This article introduces a surrogate-based...

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Rok 2020

• A new concept of PWM duty cycle computation using the Barycentric Coordinates in a Three-Dimensional voltage vectors arrangement

  Publikacja

  • P. Szczepankowski
  • N. Poliakov
  • D. Vertegel
  • K. J. Szwarc (dawniej: K. Szwarc)
  • R. Strzelecki

  - IEEE Access - Rok 2020

  The paper presents a novel approach to the Pulse Width Modulation (PWM) duty cycle computing for complex or irregular voltage vector arrangements in the two (2D) and three–dimensional (3D) Cartesian coordinate systems. The given vectors arrangement can be built using at least three vectors or collections with variable number of involved vectors (i.e. virtual vectors). Graphically, these vectors form a convex figure, in particular,...

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• Accelerated Re-Design of Antenna Structures Using Sensitivity-Based Inverse Surrogates

  Publikacja

  • S. Kozieł
  • A. Bekasiewicz

  - IEEE Access - Rok 2020

  The paper proposes a novel framework for accelerated re-design (dimension scaling) of antenna structures using inverse surrogates. The major contribution of the work is a sensitivity-based model identification procedure, which permits a significant reduction of the number of reference designs required to render the surrogate. Rigorous formulation of the approach is supplemented by its comprehensive numerical validation using a...

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• An Automatic Self-Tuning Control System Design for an Inverted Pendulum

  Publikacja

  • M. Waszak
  • R. Łangowski

  - IEEE Access - Rok 2020

  A control problem of an inverted pendulum in the presence of parametric uncertainty has been investigated in this paper. In particular, synthesis and implementation of an automatic self-tuning regulator for a real inverted pendulum have been given. The main cores of the control system are a swing-up control method and a stabilisation regulator. The first one is based on the energy of an inverted pendulum, whereas the second one...

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• Antenna Modeling Using Variable-Fidelity EM Simulations and Constrained Co-Kriging

  Publikacja

  • A. Pietrenko-Dąbrowska
  • S. Kozieł

  - IEEE Access - Rok 2020

  Utilization of fast surrogate models has become a viable alternative to direct handling of fullwave electromagnetic (EM) simulations in EM-driven design. Their purpose is to alleviate the difficulties related to high computational cost of multiple simulations required by the common numerical procedures such as parametric optimization or uncertainty quantification. Yet, conventional data-driven (or approximation) modeling techniques...

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• Circular polarization diversity implementation for correlation reduction in wideband low-cost multiple-input-multiple-output antenna

  Publikacja

  • U. Ullah
  • M. Al-hasan
  • S. Kozieł
  • I. Mabrouk

  - IEEE Access - Rok 2020

  In this paper, a multiple-input-multiple-output (MIMO) antenna featuring circular polarization diversity, and designed on a common coplanar ground is presented. The proposed antenna design utilizes a coplanar waveguide (CPW) feeding technique with three parallel coplanar ground planes, and two feedlines in-between. For circular polarization (CP), quasi-loops are created by etching slots on the outermost ground planes. With this...

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• Cost-Efficient Bi-Layer Modeling of Antenna Input Characteristics Using Gradient Kriging Surrogates

  Publikacja

  • A. Pietrenko-Dąbrowska
  • S. Kozieł
  • M. Al-hasan

  - IEEE Access - Rok 2020

  Over the recent years, surrogate modeling has been playing an increasing role in the design of antenna structures. The main incentive is to mitigate the issues related to high cost of electromagnetic (EM)-based procedures. Among the various techniques, approximation surrogates are the most popular ones due to their flexibility and easy access. Notwithstanding, data-driven modeling of antenna characteristics is associated with serious...

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• Design-Oriented Two-Stage Surrogate Modeling of Miniaturized Microstrip Circuits with Dimensionality Reduction

  Publikacja

  • S. Kozieł
  • A. Pietrenko-Dąbrowska
  • M. Al-hasan

  - IEEE Access - Rok 2020

  Contemporary microwave design heavily relies on full-wave electromagnetic (EM) simulation tools. This is especially the case for miniaturized devices where EM cross-coupling effects cannot be adequately accounted for using equivalent network models. Unfortunately, EM analysis incurs considerable computational expenses, which becomes a bottleneck whenever multiple evaluations are required. Common simulation-based design tasks include...

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• Direct modulation for conventional matrix converters using analytical signals and barycentric coordinates

  Publikacja

  • P. Szczepankowski
  • T. Bajdecki
  • R. Strzelecki

  - IEEE Access - Rok 2020

  This paper proposes the generalized direct modulation for Conventional Matrix Converters (CMC) using the concept of analytical signals and barycentric coordinates. The paper proposes a novel approach to the Pulse Width Modulation (PWM) duty cycle computing, which allows faster prototyping of direct control algorithms. The explanation of the new idea using analytical considerations demonstrating the principles of direct voltage...

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• Enhanced-Performance Circularly Polarized MIMO Antenna with Polarization/Pattern Diversity

  Publikacja

  • U. Ullah
  • I. Mabrouk
  • S. Kozieł

  - IEEE Access - Rok 2020

  Design of a compact wideband circularly polarized (CP) multiple-input multiple-output (MIMO) antenna with polarization diversity is proposed and characterized for off-body communication. The antenna is based on a simple coplanar waveguide (CPW)-fed monopole extension of the microstrip line. The orthogonal field components required by CP are induced using a simply modified right/left side ground plane. In particular, a stub extending...

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• ESPAR Antenna-Based WSN Node With DoA Estimation Capability

  Publikacja

  • M. Groth
  • M. Rzymowski
  • K. Nyka
  • Ł. Kulas

  - IEEE Access - Rok 2020

  In this paper, we present a low-cost energy-efficient electronically steerable parasitic array radiator (ESPAR) antenna-based wireless sensor network (WSN) node designed for IEEE 802.15.4 standard that is capable of performing direction of arrival (DoA) estimation in real-life outdoor environments. To this end, we propose the WSN node architecture, design and realization that utilizes NXP JN5168 radio frequency (RF) wireless transceiver...

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• Evaluation of Lombard Speech Models in the Context of Speech in Noise Enhancement

  Publikacja

  • G. Korvel
  • K. Kąkol
  • O. Kurasova
  • B. Kostek

  - IEEE Access - Rok 2020

  The Lombard effect is one of the most well-known effects of noise on speech production. Speech with the Lombard effect is more easily recognizable in noisy environments than normal natural speech. Our previous investigations showed that speech synthesis models might retain Lombard-effect characteristics. In this study, we investigate several speech models, such as harmonic, source-filter, and sinusoidal, applied to Lombard speech...

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• Expedited Design Closure of Antenna Input Characteristics by Trust Region Gradient Search and Principal Component Analysis

  Publikacja

  • J. Tomasson
  • S. Kozieł
  • A. Pietrenko-Dąbrowska

  - IEEE Access - Rok 2020

  Optimization-based parameter tuning has become an inherent part of contemporary antenna design process. For the sake of reliability, it is typically conducted at the level of full-wave electromagnetic (EM) simulation models. This may incur considerable computational expenses depending on the cost of an individual EM analysis, the number of adjustable variables, the type of task (local, global, single-/multi-objective optimization),...

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• Expedited Feature-Based Quasi-Global Optimization of Multi-Band Antenna Input Characteristics with Jacobian Variability Tracking

  Publikacja

  • S. Kozieł
  • A. Pietrenko-Dąbrowska

  - IEEE Access - Rok 2020

  Design of modern antennas relies—for reliability reasons—on full-wave electromagnetic simulation tools. In addition, increasingly stringent specifications pertaining to electrical and field performance, growing complexity of antenna topologies, along with the necessity for handling multiple objectives, make numerical optimization of antenna geometry parameters a highly recommended design procedure. Conventional algorithms, particularly...

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• Expedited Yield Optimization of Narrow- and Multi-Band Antennas Using Performance-Driven Surrogates

  Publikacja

  • A. Pietrenko-Dąbrowska
  • S. Kozieł
  • M. Al-hasan

  - IEEE Access - Rok 2020

  Uncertainty quantification is an important aspect of engineering design, also pertaining to the development and performance evaluation of antenna systems. Manufacturing tolerances as well as other types of uncertainties, related to material parameters (e.g., substrate permittivity) or operating conditions (e.g., bending) may affect the antenna characteristics. In the case of narrow- or multi-band antennas, this usually leads to...

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• Fast Fading Characterization for Body Area Networks in Circular Metallic Indoor Environments

  Publikacja

  • F. D. Cardoso
  • P. T. Kosz (dawniej: P. Kosz)
  • M. M. Ferreira
  • S. J. Ambroziak (dawniej: S. Ambroziak)
  • L. M. Correia

  - IEEE Access - Rok 2020

  With the increasing development of 5G and Body Area Network based systems being implemented in unusual environments, propagation inside metallic structures is a key aspect to characterize propagation effects inside ships and other similar environments, mostly composed of metallic walls. In this paper, indoor propagation inside circular metallic structures is addressed and fast fading statistical distributions parameters are obtained...

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• Fast multi-objective optimization of antenna structures by means of data-driven surrogates and dimensionality reduction

  Publikacja

  • S. Kozieł
  • A. Pietrenko-Dąbrowska

  - IEEE Access - Rok 2020

  Design of contemporary antenna structures needs to account for several and often conflicting objectives. These are pertinent to both electrical and field properties of the antenna but also its geometry (e.g., footprint minimization). For practical reasons, especially to facilitate efficient optimization, single-objective formulations are most often employed, through either a priori preference articulation, objective aggregation,...

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• FPGA Based Real Time Simulations of the Face Milling Process

  Publikacja

  • M. Mazur
  • M. Galewski
  • K. J. Kaliński (dawniej: K. Kaliński)

  - IEEE Access - Rok 2020

  The article presents a successful implementation of the milling process simulation at the Field-Programmable Gate Array (FPGA). By using FPGA, very rigorous Real-Time (RT) simulation requirements can be met. The response time of the FPGA simulations is significantly reduced, and the time synchronization is better than in a typical RT system implemented in software. The FPGA-based approach is characterized by enormous flexibility...

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• Framework for Integration Decentralized and Untrusted Multi-vendor IoMT Environments

  Publikacja

  • A. Sobecki
  • J. Szymański
  • D. Gil
  • H. Mora

  - IEEE Access - Rok 2020

  Lack of standardization is highly visible while we use historical data sets or compare our model with others that use IoMT devices from different vendors. The problem also concerns the trust in highly decentralized and anonymous environments where sensitive data are transferred through the Internet and then are analyzed by third-party companies. In our research we propose a standard that has been implemented in the form of framework...

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• Hybrid Expert System for Computer-Aided Design of Ship Thruster Subsystems

  Publikacja

  • A. Kopczyński

  - IEEE Access - Rok 2020

  The article presents an expert system supporting the design of ship's power subsystems, in particular the thruster subsystem. The proposed hybrid expert system uses the results of simulation tests as the additional source of knowledge. The results of system operation are collated in a report which can be used as part of ship design description. The work oriented on developing the expert system is the continuation of the research...

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• Hybrid Obfuscation Technique to Protect Source Code From Prohibited Software Reverse Engineering

  Publikacja

  • A. Al-Hakimi
  • A. Sultan
  • A. Abdul
  • N. Ali
  • N. Admodisastro
  • D. A. M. Al-Hakimi

  - IEEE Access - Rok 2020

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• Implementation of spatial/polarization diversity for improved-performance circularly polarized multiple-input-multiple-output ultra-wideband antenna

  Publikacja

  • U. Ullah
  • I. Mabrouk
  • S. Kozieł
  • M. Al-hasan

  - IEEE Access - Rok 2020

  In this paper, spatial and polarization diversities are simultaneously implemented in an ultra-wideband (UWB) multiple-input-multiple-output (MIMO) antenna to reduce the correlation between the parallel-placed radiators. The keystone of the antenna is systematically modified coplanar ground planes that enable excitation of circular polarization (CP). To realize one sense of circular polarization as well as ultra-wideband operation,...

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• Improved-Efficacy Optimization of Compact Microwave Passives by Means of Frequency-Related Regularization

  Publikacja

  • S. Kozieł
  • A. Pietrenko-Dąbrowska
  • H. Alhasan

  - IEEE Access - Rok 2020

  Electromagnetic (EM)-driven optimization is an important part of microwave design, especially for miniaturized components where the cross-coupling effects in tightly arranged layouts make traditional (e.g., equivalent network) representations grossly inaccurate. Efficient parameter tuning requires reasonably good initial designs, which are difficult to be rendered for newly developed structures or when re-design for different operating...

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• Improving the Quality of Magnetic Signature Reproduction by Increasing Flexibility of Multi-Dipole Model Structure and Enriching Measurement Information

  Publikacja

  • J. Tarnawski
  • A. Cichocki
  • T. A. Rutkowski (dawniej: T. Rutkowski)
  • K. Buszman
  • M. Wołoszyn

  - IEEE Access - Rok 2020

  The paper presents the construction of a multi-dipole model that allows reproducing magneticsignatures of ferromagnetic objects. The virtual object used in the paper is an ellipsoid, which is the sourceof synthetic data. To make the situation more realistic, noise is added to the synthetic data. Two significantimprovements compared to previous work are presented. Three-axial magnetometers are introduced insteadof uniaxial magnetometers....

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• Neural Architecture Search for Skin Lesion Classification

  Publikacja

  • A. Kwasigroch
  • M. Grochowski
  • A. Mikołajczyk-Bareła (dawniej: A. Mikołajczyk)

  - IEEE Access - Rok 2020

  Deep neural networks have achieved great success in many domains. However, successful deployment of such systems is determined by proper manual selection of the neural architecture. This is a tedious and time-consuming process that requires expert knowledge. Different tasks need very different architectures to obtain satisfactory results. The group of methods called the neural architecture search (NAS) helps to find effective architecture...

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• On Computationally-Efficient Reference Design Acquisition for Reduced-Cost Constrained Modeling and Re-Design of Compact Microwave Passives

  Publikacja

  • S. Kozieł
  • A. Pietrenko-Dąbrowska

  - IEEE Access - Rok 2020

  Full-wave electromagnetic (EM) analysis has been playing a major role in the design of microwave components for the last few decades. In particular, EM tools allow for accurate evaluation of electrical performance of miniaturized structures where strong cross-coupling effects cannot be adequately quantified using equivalent network models. However, EM-based design procedures (parametric optimization, statistical analysis) generate...

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• On Inadequacy of Sequential Design of Experiments for Performance-Driven Surrogate Modeling of Antenna Input Characteristics

  Publikacja

  • A. Pietrenko-Dąbrowska
  • S. Kozieł

  - IEEE Access - Rok 2020

  Design of contemporary antennas necessarily involves electromagnetic (EM) simulation tools. Their employment is imperative to ensure evaluation reliability but also to carry out the design process itself, especially, the adjustment of antenna dimensions. For the latter, traditionally used parameter sweeping is more and more often replaced by rigorous numerical optimization, which entails considerable computational expenses, sometimes...

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• On the Usefulness of the Generalised Additive Model for Mean Path Loss Estimation in Body Area Networks

  Publikacja

  • M. Laskowski
  • S. J. Ambroziak (dawniej: S. Ambroziak)
  • L. M. Correia
  • K. Świder

  - IEEE Access - Rok 2020

  In this article, the usefulness of the Generalised Additive Model for mean path loss estimation in Body Area Networks is investigated. The research concerns a narrow-band indoor off-body network operating at 2.45 GHz, being based on measurements performed with four different users. The mean path loss is modelled as a sum of four components that depend on path length, antenna orientation angle, absolute difference between transmitting...

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• Quasi-Global Optimization of Antenna Structures Using Principal Components and Affine Subspace-Spanned Surrogates

  Publikacja

  • J. Tomasson
  • S. Kozieł
  • A. Pietrenko-Dąbrowska

  - IEEE Access - Rok 2020

  Parametric optimization is a mandatory step in the design of contemporary antenna structures. Conceptual development can only provide rough initial designs that have to be further tuned, often extensively. Given the topological complexity of modern antennas, the design closure necessarily involves full-wave electromagnetic (EM) simulations and—in many cases—global search procedures. Both factors make antenna optimization a computationally...

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• Rapid optimization of compact microwave passives using kriging surrogates and iterative correction

  Publikacja

  • S. Kozieł
  • A. Pietrenko-Dąbrowska

  - IEEE Access - Rok 2020

  Design of contemporary microwave components is—in a large part—based on full-wave electromagnetic (EM) simulation tools. The primary reasons for this include reliability and versatility of EM analysis. In fact, for many microwave structures, notably compact components, EM-driven parameter tuning is virtually imperative because traditional models (analytical or network equivalents) are unable to account for the cross-coupling effects,...

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• Recent advances in high-frequency modeling by means of domain confinement and nested kriging

  Publikacja

  • S. Kozieł
  • A. Pietrenko-Dąbrowska

  - IEEE Access - Rok 2020

  Development of modern high-frequency components and circuits is heavily based on full-wave electromagnetic (EM) simulation tools. Some phenomena, although important from the point of view of the system performance, e.g., EM cross-coupling effects, feed radiation in antenna arrays, substrate anisotropy, cannot be adequately accounted for using simpler means such as equivalent network representations. Consequently, the involvement...

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