Rok 2020

• 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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• Reinforced Secure Gossiping Against DoS Attacks in Post-Disaster Scenarios

  Publikacja

  • C. Esposito
  • Z. Zhao
  • J. Rak

  - IEEE Access - Rok 2020

  During and after a disaster, the perceived quality of communication networks often becomes remarkably degraded with an increased ratio of packet losses due to physical damages of the networking equipment, disturbance to the radio frequency signals, continuous reconfiguration of the routing tables, or sudden spikes of the network traffic, e.g., caused by the increased user activity in a post-disaster period. Several techniques have...

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• Sensor Position Estimation Method for IoT Using Mobile Reference Node

  Publikacja

  • J. Stefański
  • J. Sadowski

  - IEEE Access - Rok 2020

  The paper proposes an innovative method of locating objects for the Internet of Things (IoT). The proposed method allows the position of a fixed measuring sensor (MS) to be estimated using one mobile base station with a known position moving around the MS. The mathematical analysis of the method, and three algorithms — Newton’s (NA), gradient descent (GD) and genetic (GA) — for solving the system of non-linear positional equations...

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• Ship Collision Risk Assessment Based on Collision Detection Algorithm

  Publikacja

  • D. Liu
  • G. Shi

  - IEEE Access - Rok 2020

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• Simulation-Driven Antenna Modeling by Means of Response Features and Confined Domains of Reduced Dimensionality

  Publikacja

  • A. Pietrenko-Dąbrowska
  • S. Kozieł

  - IEEE Access - Rok 2020

  In recent years, the employment of full-wave electromagnetic (EM) simulation tools has become imperative in the antenna design mainly for reliability reasons. While the CPU cost of a single simulation is rarely an issue, the computational overhead associated with EM-driven tasks that require massive EM analyses may become a serious bottleneck. A widely used approach to lessen this cost is the employment of surrogate models, especially...

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• Stress Monitoring System for Individuals with Autism Spectrum Disorders

  Publikacja

  • M. T. Tomczak (dawniej: M. Tomczak)
  • M. Wójcikowski
  • B. Pankiewicz
  • J. Łubiński
  • J. Majchrowicz
  • D. Majchrowicz
  • A. Walasiewicz
  • T. Kiliński
  • M. Szczerska

  - IEEE Access - Rok 2020

  In this article, a stress monitoring system tailored for individuals with Autism Spectrum Disorders (ASD) and developed for the educational institution is presented. People with ASD face problems with effective stress management due to their high self-perceived levels of stress, poor ability to cope with it, and dificulties with the accurate detection of the source of stress. Consistently, being able to measure stress appears to...

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• The Impact of Lexicon Adaptation on the Emotion Mining From Software Engineering Artifacts

  Publikacja

  • M. Wróbel

  - IEEE Access - Rok 2020

  Sentiment analysis and emotion mining techniques are increasingly being used in the field of software engineering. However, the experiments conducted so far have not yielded high accuracy results. Researchers indicate a lack of adaptation of the methods of emotion mining to the specific context of the domain as the main cause of this situation. The article describes research aimed at examining whether the adaptation of the lexicon...

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• Toward Robust Pedestrian Detection With Data Augmentation

  Publikacja

  • S. Cygert
  • A. Czyżewski

  - IEEE Access - Rok 2020

  In this article, the problem of creating a safe pedestrian detection model that can operate in the real world is tackled. While recent advances have led to significantly improved detection accuracy on various benchmarks, existing deep learning models are vulnerable to invisible to the human eye changes in the input image which raises concerns about its safety. A popular and simple technique for improving robustness is using data...

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• Usability of mobile applications: a systematic literature study

  Publikacja

  • P. Weichbroth

  - IEEE Access - Rok 2020

  Since the release of the first mobile devices, the usability of on-board applications has been the concern not only of software vendors but hardware manufacturers as well. The academia community later willingly joined the discussion on usability in terms of theory and empirical measurement, having experience and knowledge in desktop settings. At first sight, such a background should guarantee a solid foundation to conduct research...

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Rok 2019

• An Enhanced Reduced Basis Method for Wideband Finite Element Method Simulations

  Publikacja

  • D. Szypulski
  • G. Fotyga
  • M. Mrozowski

  - IEEE Access - Rok 2019

  In this paper, we present a novel strategy for selecting expansion points in the reduced basis method. A single computation of the error estimator is used to select a few expansion points in the multi-parameter space simultaneously. The number of selected points is determined adaptively, based on the accuracy of the current reduced model. The reliability and efficiency of this proposed approach are illustrated by numerical tests...

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• Application of Barycentric Coordinates in Space Vector PWM Computations

  Publikacja

  • P. Szczepankowski
  • J. Nieznański

  - IEEE Access - Rok 2019

  This paper proposes the use of barycentric coordinates in the development and implementationof space-vector pulse-width modulation (SVPWM) methods, especially for inverters with deformed space-vector diagrams. The proposed approach is capable of explicit calculation of vector duty cycles, independentof whether they assume ideal positions or are displaced due to the DC-link voltage imbalance. The use ofbarycentric coordinates also...

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• Compensation Topologies in IPT Systems: Standards, Requirements, Classification, Analysis, Comparison and Application

  Publikacja

  • V. Shevchenko
  • O. Husev
  • R. Strzelecki
  • B. Pakhaliuk
  • N. Poliakov
  • N. Strzelecka

  - IEEE Access - Rok 2019

  Wireless power transfer devices are becoming more relevant and widespread. Therefore, an article is devoted to a review, analysis and comparison of compensation topologies for an inductive power transfer. A new classification of topologies is developed. A lot of attention is paid to the problems of the physical fundamentals of compensation work, standards, safety, and five main topology requirements. It is determined, that topologies...

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• Distributed Architectures for Intensive Urban Computing: A Case Study on Smart Lighting for Sustainable Cities

  Publikacja

  • H. Mora
  • J. Peral
  • A. Ferrandez
  • D. Gil
  • J. Szymański

  - IEEE Access - Rok 2019

  New information and communication technologies have contributed to the development of the smart city concept. On a physical level, this paradigm is characterised by deploying a substantial number of different devices that can sense their surroundings and generate a large amount of data. The most typical case is image and video acquisition sensors. Recently, these types of sensors are found in abundance in urban spaces and are responsible...

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• Enabling Deeper Linguistic-based Text Analytics – Construct Development for the Criticality of Negative Service Experience

  Publikacja

  • A. Ojo (dawniej: O. Adegboyega)
  • N. Rizun

  - IEEE Access - Rok 2019

  Significant progress has been made in linguistic-based text analytics particularly with the increasing availability of data and deep learning computational models for more accurate opinion analysis and domain-specific entity recognition. In understanding customer service experience from texts, analysis of sentiments associated with different stages of the service lifecycle is a useful starting point. However, when richer insights...

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• Low-Profile ESPAR Antenna for RSS-Based DoA Estimation in IoT Applications

  Publikacja

  • M. Burtowy
  • M. Rzymowski
  • Ł. Kulas

  - IEEE Access - Rok 2019

  In this paper, we have introduced a low-profile electronically steerable parasitic array radiator (ESPAR) antenna that can successfully be used to estimate the direction-of-arrival (DoA) of incoming signals in wireless sensor network (WSN) applications, in which the height of the complete antenna has to be low. The proposed antenna is over three times lower than high-profile ESPAR antenna designs currently available in the literature...

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• Scoreboard Architectural Pattern and Integration of Emotion Recognition Results

  Publikacja

  • A. Landowska
  • G. Brodny

  - IEEE Access - Rok 2019

  This paper proposes a new design pattern, named Scoreboard , dedicated for applications solving complex, multi-stage, non-deterministic problems. The pattern provides a computational framework for the design and implementation of systems that integrate a large number of diverse specialized modules that may vary in accuracy, solution level, and modality. The Scoreboard is an extension of Blackboard design pattern and comes under...

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Rok 2018

• A GPU Solver for Sparse Generalized Eigenvalue Problems with Symmetric Complex-Valued Matrices Obtained Using Higher-Order FEM

  Publikacja

  • A. Dziekoński
  • M. Mrozowski

  - IEEE Access - Rok 2018

  The paper discusses a fast implementation of the stabilized locally optimal block preconditioned conjugate gradient (sLOBPCG) method, using a hierarchical multilevel preconditioner to solve nonHermitian sparse generalized eigenvalue problems with large symmetric complex-valued matrices obtained using the higher-order finite-element method (FEM), applied to the analysis of a microwave resonator. The resonant frequencies of the low-order...

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• Preconditioners with Low Memory Requirements for Higher-Order Finite-Element Method Applied to Solving Maxwell’s Equations on Multicore CPUs and GPUs

  Publikacja

  • A. Dziekoński
  • G. Fotyga
  • M. Mrozowski

  - IEEE Access - Rok 2018

  This paper discusses two fast implementations of the conjugate gradient iterative method using a hierarchical multilevel preconditioner to solve the complex-valued, sparse systems obtained using the higher order finite-element method applied to the solution of the time-harmonic Maxwell equations. In the first implementation, denoted PCG-V, a classical V-cycle is applied and the system of equations on the lowest level is solved...

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Rok 2017

• Timber Frame Houses with Different Insulation Materials - Seismic Analysis

  Publikacja

  • M. Szczepański
  • W. Migda
  • R. Jankowski

  - IEEE Access - Rok 2017

  The aim of this article is to present results of a dynamic numerical analysis focused on the response of two timber frame building structures exposed to seismic excitations. The first structure was insulated with mineral wool, while the second one with polyurethane foam. Specifications and technology involved in the models' construction are based on the previously conducted experimental study, upon which numerical structural models...

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