Wyniki wyszukiwania dla: point estimate method

• A comprehensive evaluation of flexible FDM/FFF 3D printing filament as a potential material in medical application

  Publikacja

  • A. Haryńska
  • I. Carayon
  • P. Kosmela
  • K. Szeliski
  • M. S. Łapiński
  • M. Pokrywczyńska
  • J. Kucińska-Lipka
  • H. Janik

  - EUROPEAN POLYMER JOURNAL - Rok 2020

  The use of FDM/FFF in 3D printing for medical sciences is becoming common. This is due to the high availability and decent price of both 3D printers and filaments useful for FDM/FFF. Currently, researchers' attention is focused mainly on the study of medical filaments based on PLA, PCL or their modifications. This contributes to insufficient diversity of medical-grade filaments on the market. Moreover, due to the lack of specified...

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• ENERGY AND EMISSION QUALITY RANKING OF NEWLY PRODUCED LOW-SULPHUR MARINE FUEL

  Publikacja

  • Z. Korczewski

  - Polish Maritime Research - Rok 2022

  The article describes the methodology of engine tests on new types of low-sulphur marine fuels in laboratory conditions in order to conduct a comprehensive assessment of their suitability for powering full-size marine engines. The innovativeness of the proposed solution consists of adapting the laboratory Diesel Engine Test Bed to carry out experimental tests using residual and alternative fuels so that it is possible to imitate...

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• Acceleration of the DGF-FDTD method on GPU using the CUDA technology

  Publikacja

  • T. Dziubak
  • M. Wiktor
  • S. Orłowski
  • T. Stefański

  - Rok 2015

  We present a parallel implementation of the discrete Green's function formulation of the finite-difference time-domain (DGF-FDTD) method on a graphics processing unit (GPU). The compute unified device architecture (CUDA) parallel computing platform is applied in the developed implementation. For the sake of example, arrays of Yagi-Uda antennas were simulated with the use of DGF-FDTD on GPU. The efficiency of parallel computations...

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• A New Geodetic Method of Examination of Geometrical Conditions of a Crane Bridge

  Publikacja

  • D. Filipiak-Kowszyk
  • W. Kamiński
  • K. Makowska-Jarosik

  - Geosciences - Rok 2019

  Safety is one of the key aspects related to crane-based material transport. In order to ensure safe crane operation and material transport, it is necessary to meet certain geometrical conditions. The authors addressed the geometrical conditions of a crane bridge, a substantial crane component. The paper presents the method to compute displacement components of points on the top of a bridge crane relative to their design position....

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• Peer assessment as a method for measuring harmful internet use

  Publikacja

  • W. W. Koczkodaj
  • A. Kowalczyk
  • M. Mazurek
  • W. Pedrycz
  • G. Redlarski
  • E. Rogalska
  • D. Strzałka
  • A. Szymańska
  • A. Wilinski
  • S. Xue

  - MethodsX - Rok 2023

  Harmful Internet use (HIU) describes unintended use of the Internet. It could be both self-harm and harming others. Our research goal is to develop a more accurate method for measuring HIU by this novel peer assessment. As such, it may become, with our call for more research, a paradigm shift supplementing every rating scale or other type of Internet use assessment. In addition to classic statistical analysis, structural equations...

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• Designing a ship course controller by applying the adaptivebackstepping method

  Publikacja

  • A. Witkowska
  • R. Śmierzchalski

  - International Journal of Applied Mathematics and Computer Science - Rok 2012

  The article discusses the problem of designing a proper and efficient adaptive course-keeping control system for a seagoingship based on the adaptive backstepping method. The proposed controller in the design stage takes into account thedynamic properties of the steering gear and the full nonlinear static maneuvering characteristic. The adjustable parametersof the achieved nonlinear control structure were tuned up by using the...

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• Comparison of Selection Schemes in Evolutionary Method of Path Planning

  Publikacja

  • P. Kolendo
  • B. Jaworski
  • R. Śmierzchalski

  - LECTURE NOTES IN COMPUTER SCIENCE - Rok 2011

  This article compares an impact of using various selection schemes on the quality of the solution for the problem of planning the path for a moving object using the evolutionary method. In study case problem of avoiding collisions at sea is analyzed. The modelled environment includes static constraints (lands, canals, etc.) and dynamic objects (moving ships). Article analyses behaviour of selection schemes in two similar environments...

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• OPTIMALIZATION OF SORBENT FEEDING IN THE DRY METHOD OF FLUE GAS DESULFURIZATION

  Publikacja

  • P. Kwiatkowski
  • R. Zadrąg

  - Journal of Polish CIMEEAC - Rok 2017

  The swiftly developing sea transport contributes to a considerable increase of fuel usage in the international shipping, which results in the escalation of toxic compounds emitted into the atmosphere. It is followed by the constantly heightened requirements limiting those emissions. In the case of sulfur oxide emission, inside of SECA (Sulfur Emission Control Area), the maximum content of sulfur in the shipping fuels used on the...

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• "Shadow" method application within endoscopic examinations of marine engines

  Publikacja

  • Z. Korczewski
  • J. Rudnicki

  - Rok 2012

  The paper deals with diagnostic issues concerning endoscopic examinations of the working spaces within marine diesel and gas turbine engines. In the beginning, the endoscopy apparatus being on the laboratory equipment of the Department of Ship Power Plants of Gdansk University of Technology in Poland has been characterized. The endoscopy considerations have been focused on theoretical bases of a digital image processing and especially...

• "Shadow" method application within endoscopic examinations of marine engines

  Publikacja

  • Z. Korczewski
  • J. Rudnicki

  - Rok 2012

  The paper deals with diagnostic issues concerning endoscopic examinations of the working spaces within marine diesel and gas turbine engines. In the beginning, the endoscopy apparatus being on the laboratory equipment of the Department of Ship Power Plants of Gdansk University of Technology in Poland has been characterized. The endoscopy considerations have been focused on theoretical bases of a digital image processing and especially...

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• DETERMINATION OF SEAKEEPING PERFORMANCE FOR A CASE STUDY VESSEL BY THE STRIP THEORY METHOD

  Publikacja

  • K. Niklas
  • A. Karczewski

  - Polish Maritime Research - Rok 2020

  The increase of seakeeping performance is of particular importance for car and passenger ferries, service ships in the gas and oil extraction industry and offshore wind power farm industry, as well as for special purpose ships (including military applications). In the water areas of the Baltic Sea, North Sea, and Mediterranean Sea, which are characterised by a short and steep wave, the hull shape has a substantial impact on the...

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• Estimation of Selected Synchronous Generator Parameters Based on the Gradient Method

  Publikacja

  • Z. Lubośny
  • J. Klucznik
  • K. Dobrzyński

  - Acta Energetica - Rok 2014

  The authors present a method for the estimation of synchronous generator model parameters using a gradient algorithm. The paper shows an example of model parameter estimation for a turbogenerator and hydrogenerator, based on the generator voltage time responses obtained during an active and reactive power rejection test.

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• Monitoring of underdeck corrosion by using acoustic emission method

  Publikacja

  • K. Emilianowicz

  - Polish Maritime Research - Rok 2014

  This paper presents first short characteristics of underdeck corrosion process as well as a problem of its monitoring. Next is described an acoustic emission (AE) method elaborated by Department of Ship Technology , Quality Systems and Material Engineering, Gdańsk University of Technology in cooperation with partners of CORFAT project realized within 7th EU Frame Program . Further are presented short characteristics of the emission...

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• A novel method of time-frequency analysis: an essential spectrogram

  Publikacja

  • K. Czarnecki

  - HYDROACOUSTICS - Rok 2013

  A novel precise method of time-frequency analysis is presented. In the algorithm, a new energy distribution is estimated by simultaneously discard or displacement of the classical spec- trogram energy. A channelized instantaneous frequency and a local group delay are used in order to replacement in the same manner as formulated by Kodera et al. [1, 2]. Additionally, new representations: a channelized instantaneous bandwidth and...

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• Micro-cracking pattern recognition of hybrid CNTs/GNPs cement pastes under three-point bending loading using acoustic emission technique

  Publikacja

  • S. Ashraf

  - Rok 2021

  The generation of microcracks has an important influence on the behaviour of concrete structures. In this study, the acoustic emission (AE) technique was used to investigate the fracture phenomena and micro-cracking behavior of hybrid carbon nanotubes (CNTs, the 1-D allotrope of carbon atoms) and graphene nanoplatelets (GNPs, 2D monolayer of sp2-hybridized carbon atoms), cement composites under three-point bending loading. In...

• Application of the corrosion tester in corrosion tests using the acoustic emission method.

  Publikacja

  • K. Emilianowicz
  • M. Supernak
  • A. Ossowska

  - Polish Maritime Research - Rok 2022

  The article presents an innovative method of corrosion tests using the acoustic emission method and the corrosion tester. The problem of corrosion occurring in ballast tanks and tanks carrying petroleum products is discussed. The acoustic method is presented which, due to the use of a unique corrosion tester, is used to monitor the course of corrosion processes in steel. The principle of operation of the corrosion tester, its construction...

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• Verification of the new viscoelastic method of thermal stress calculation in asphalt layers of pavements

  Publikacja

  • J. Judycki

  - International Journal of Pavement Engineering - Rok 2018

  The new viscoelastic method of thermal stress calculations in asphalt layers has been developed and published recently by the author. This paper presents verification of this method. The verification is based on the comparison of the results of calculations with results of testing of thermal stresses in Thermal Stress Restrained Specimen Test. The calculations of thermal stresses according to the new method were based on rheological...

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• The Maximum Power Point Tracking (MPPT) of a Partially Shaded PV Array for Optimization Using the Antlion Algorithm

  Publikacja

  • M. Abbass
  • R. Lis
  • F. Saleem

  - ENERGIES - Rok 2023

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• Bariatric Surgery during COVID-19 Pandemic from Patients’ Point of View—The Results of a National Survey

  Publikacja

  • M. Walędziak
  • A. Różańska-Walędziak
  • M. Pędziwiatr
  • J. Szeliga
  • M. Proczko-Stepaniak
  • M. Wysocki
  • T. Stefura
  • P. Major

  - Journal of Clinical Medicine - Rok 2020

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• Description of the solution set of the von Karman equations for a circular plate in a small neighbourhood of a simple bifurcation point

  Publikacja

  • J. Janczewska

  - NODEA-NONLINEAR DIFFERENTIAL EQUATIONS AND APPLICATIONS - Rok 2006

  W niniejszej pracy badamy równania von Karmana dla cienkiej, sprężystej, kołowej płyty na sprężystym podłożu, poddawanej działaniu sił ściskających wzdłuż brzegu. Są to równania różniczkowe cząstkowe IV rzędu. Stosując metody analizy nieliniowej, opisujemy zbiór rozwiązań równań von Karmana w małym otoczeniu jednokrotnego punktu bifurkacji.Badania były finansowane przez grant nr 1 P03A 042 29.

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• The influence of sonication time on the biogenic amines formation as a critical point in uncured dry-fermented beef manufacturing

  Publikacja

  • K. Wójciak
  • D. Stasiak
  • J. Stadnik
  • K. Ferysiuk
  • A. Kononiuk

  - INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY - Rok 2019

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• Fuzzy Based Maximum Power Point Tracking (MPPT) Control System for Photovoltaic Power Generation System

  Publikacja

  • K. Ullah

  - Rok 2021

• space-vector pulse width modulation for three-level npc converter with the neutral point voltage control

  Publikacja

  • A. Lewicki
  • Z. Krzemiński
  • H. Abu-Rub

  - IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS - Rok 2011

  Przedstawiono strategię modulacji PWM dla trójpoziomowych falowników NPC z predykcją i kompensacją asymetrii rozkładu napięcia na kondensatorach obwodu pośredniczącego

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• Existence of positive solutions to second order four-point impulsive differential problems with deviating arguments [online]

  Publikacja

  • T. Jankowski

  - COMPUTERS & MATHEMATICS WITH APPLICATIONS - Rok 2009

  W pracy dyskutowane są problemy brzegowe dla równań różniczkowych rzędu drugiego z impulsami i z odchylonymi argumentami. Badano przypadki dla argumentów opóźnionych i wyprzedzonych. Podano warunki które gwarantują, że omawiane problemy mają rozwiązania dodatnie. Zastosowano odpowiednie twierdzenie o punkcie stałym.

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• Calculations of fracture process zones on meso-scale in notched concrete beams subjected to three-point bending.

  Publikacja

  • Ł. Skarżyński
  • J. Tejchman

  - EUROPEAN JOURNAL OF MECHANICS A-SOLIDS - Rok 2010

  W artykule przedstawiono wyniki numeryczne MES modelowanie belek betonowych z nacięciem na poziomie skali mezo. Beton został opisany na poziomie skali mezo jako stochastyczny materiał 3-składnikowy złożony z kruszywa, zaczynu cementowego oraz stref kontaktu. Obliczenia wykonano przy wykorzystaniu modelu degradacji sztywności z nielokalnym osłabieniem. Zbadano wpływ stochastycznego rozkładu kruszywa, średnicy, kształtu oraz zagęszczenia...

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• Thermal dewetting as a method of surface modification of the gold thin films for surface plasmon resonance based sensor applications

  Publikacja

  • M. S. Łapiński
  • R. Kozioł
  • A. Zawadzka
  • W. Sadowski
  • B. Kościelska

  - Materials Today Communications - Rok 2022

  Here, we report a quick and simple approach with low, optimized production costs to obtain surface plasmon resonance (SPR) based sensors fabricated through a time- and resource-effective method based on thermal dewetting of thin Au films. From the applicative point of view, the method of detection presented here should be easier to implement, since light transmission measurements seem to be much less challenging than light refractive...

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• The influence of thermal conditions on V2O5 nanostructures prepared by sol-gel method

  Publikacja

  • M. Prześniak-Welenc
  • M. S. Łapiński
  • T. Lewandowski
  • B. Kościelska
  • L. Wicikowski
  • W. Sadowski

  - Journal of Nanomaterials - Rok 2015

  This work presents the result of structure investigations ofV 2O5 nanorods grown from thin films and powders prepared by sol-gel method. To examine the best temperature of nanorods crystallization, thin films deposited by spin-coating method on quartz glass or silicon substrates and bulk xerogel powders were annealed at various temperatures ranging from 100∘C to 600∘C. The structure of the samples was characterized by X-ray diffraction...

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• A method of the UMTS-FDD network design based on universal load characteristics

  Publikacja

  • S. Gajewski

  - Rok 2009

  In the paper an original method of the UMTS radio network design was presented. The method is based on simple way of capacity-coverage trade-off estimation for WCDMA/FDD radio interface. This trade-off is estimated by using universal load characteristics and normalized coverage characteristics. The characteristics are useful for any propagation environment as well as for any service performance requirements. The practical applications...

• Arching of railway turnouts by analytical design method

  Publikacja

  • W. Koc

  - Current Journal of Applied Science and Technology (British Journal of Applied Science & Technology) - Rok 2017

  The paper involved the issue of arching of the railway turnouts. This is an issue which is given relatively less attention to scientific and research activities. Reference has been made to the book by Wladyslaw Rzepka, under the title „Curved turnouts in plan and profile”, which has been used in Poland for more than 50 years as the main source of information relating to the turnouts on the curve. The book is a compilation of elaborations...

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• Analytical design method for widening the intertrack space

  Publikacja

  • W. Koc

  - Current Journal of Applied Science and Technology (British Journal of Applied Science & Technology) - Rok 2019

  The paper involved the issue of arching of the railway turnouts. This is an issue which is given relatively less attention to scientific and research activities. Reference has been made to the book by Wladyslaw Rzepka, under the title „Curved turnouts in plan and profile”, which has been used in Poland for more than 50 years as the main source of information relating to the turnouts on the curve. The book is a compilation of elaborations...

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• A Method of Real-Time Non-uniform Speech Stretching

  Publikacja

  • A. Kupryjanow
  • A. Czyżewski

  - Rok 2012

  Developed method of real-time non-uniform speech stretching is presented.The proposed solution is based on the well-known SOLA algorithm(Synchronous Overlap and Add). Non-uniform time-scale modification isachieved by the adjustment of time scaling factor values in accordance with thesignal content. Dependently on the speech unit (vowels/consonants), instantaneousrate of speech (ROS), and speech signal presence, values of the scalingfactor...

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• Coherent-wave Monte Carlo method for simulating light propagation in tissue

  Publikacja

  • M. Kraszewski
  • J. Pluciński

  - Rok 2016

  Simulating propagation and scattering of coherent light in turbid media, such as biological tissues, is a complex problem. Numerical methods for solving Helmholtz or wave equation (e.g. finite-difference or finite-element methods) require large amount of computer memory and long computation time. This makes them impractical for simulating laser beam propagation into deep layers of tissue. Other group of methods, based on radiative...

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• METHOD OF TRAINING THE ENDOSCOPIC VIDEO ANALYSIS ALGORITHMS TO MAXIMIZE BOTH ACCURACY AND STABILITY

  Publikacja

  • J. Cychnerski
  • A. Brzeski
  • A. Blokus

  - Rok 2013

  In the article a new training and testing method of endoscopic video analysis algorithms is presented. Classical methods take into account only eciency of recognizing objects on single video frames. Proposed method additionally considers stability of classiers output for real video input. The method is simple and can be trained on data sets created for other solutions. Therefore, it is easily applicable to existing endoscopic video...

• ADOPTED ISOCHRONE METHOD IMPROVING SHIP SAFETY IN WEATHER ROUTING WITH EVOLUTIONARY APPROACH

  Publikacja

  • J. Szłapczyńska
  • R. Śmierzchalski

  - International Journal of Reliability Quality & Safety Engineering - Rok 2007

  The paper is focused on adaptation of an isochrone method necessary for application to a weather routing system with evolutionary approach. Authors propose an adaptation of the isochrone method with area partitioning assuring that the route found by the adopted method would not cross land. In result, when applied to a weather routing system with evolutionary approach, this proposal facilitates creation of initial population, resulting...

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• Fault detection in the marine engine using a support vector data description method

  Publikacja

  • K. Wrzask
  • J. Kowalski
  • V. V. Le
  • V. B. Nguyen
  • D. N. Cao

  - Journal of Marine Engineering and Technology - Rok 2024

  Fast detection and correct diagnosis of any engine condition changes are essential elements of safety andenvironmental protection. Many diagnostic algorithms significantly improve the detection of malfunctions.Studies on diagnostic methods are rarely reported and even less implemented in the marine engine industry.To fill this gap, this paper presents the Support Vector Data Description (SVDD) method as applied to thefault detection...

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• Proton Conducting Ceramic Powder Synthesis by a Low Temperature Method

  Publikacja

  • M. Gazda
  • A. D. Mielewczyk-Gryń
  • K. Gdula-Kasica
  • S. L. Wachowski

  - JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY - Rok 2015

  Molten salt synthesis (MSS) is a simple method for the preparation of ceramic powders with specific morphology. The main role of the molten salts is to increase the reaction rate and lower the reaction temperature. It occurs because of much higher mobility of reactants in the liquid medium than in the solid state. In this work the molten salt synthesis was applied to produce ceramic powders of La0995Ca0005NbO4 and BaCe09−xZrxY01O3....

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• Method for Assessing Rail Transport Competitiveness in Poland and the United Kingdom

  Publikacja

  • D. Kaszubowski

  - Rok 2015

  Both in Poland and United Kingdom, as well as worldwide, railways have to compete with other modes of transport, and the rail industry seeks for possibilities of achieving a competitive advantage over them. Thus, there is a need for methods for assessment of rail transport competitiveness and detection of areas for improvement. This paper presents a method developed for the Polish regional transport market and verified according...

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• Method of lines for nonlinear first order partial functional differential equations.

  Publikacja

  • A. Szafrańska

  - BULLETIN OF THE BELGIAN MATHEMATICAL SOCIETY-SIMON STEVIN - Rok 2013

  Classical solutions of initial problems for nonlinear functional differential equations of Hamilton--Jacobi type are approximated by solutions of associated differential difference systems. A method of quasilinearization is adopted. Sufficient conditions for the convergence of the method of lines and error estimates for approximate solutions are given. Nonlinear estimates of the Perron type with respect to functional variables...

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• Adaptive Multiplex Resource Allocation Method for DAB+ Broadcast System

  Publikacja

  • P. Falkowski-Gilski

  - Rok 2017

  In this paper an adaptive multiplex resource allocation method for the DAB+ broadcast system is presented. An analysis of content transmitted over different radio programs with respect to their profile is discussed. Simulation results of an adaptive multiplexer, as well as the technological demonstrator, fully compatible with the DAB+ standard, are described. The concept is verified by a subjective quality assessment study of real-time...

• The new investing effectiveness evaluation multi-criteria method in modern supply systems

  Publikacja

  • W. Kamrat

  - Gaz, Woda i Technika Sanitarna - Rok 2023

  The important problem in the processes of modelling and programming the development of sustainable energy sector is the multi-criteria manner of assessing the effectiveness of investments. The goal of this paper is to show how to take into account the impact of investments in multidimensional modelling decision-making processes. This goal can be achieved through the development, presentation, and use of a new multi-criteria method...

• Efficient Fabry-Perot Open Resonator Analysis by the use of a Scattering Matrix Method

  Publikacja

  • M. Warecka
  • S. Dziedziewicz
  • P. Kowalczyk
  • R. Lech
  • P. Czekala
  • B. Salski
  • P. Kopyt

  - Rok 2022

  In this paper a comparative study of the computational efficiency of two modeling methods applied to the analysis of the plano- and double-concave Fabry-Perot open resonators is presented. In both numerical approaches, a scattering matrix method was applied, which allows splitting the analysis of the resonator into several sections, including the one with a spherical mirror, which requires the largest computing resources. Two modeling...

• Use of the AHP Method for Preference Determination in Yacht Design

  Publikacja

  • J. SIERZPUTOWSKI

  - Polish Maritime Research - Rok 2023

  A sailing yacht is a human-centred product, the design of which revolves primarily around the wants and desires of the future owner. In most cases, these preferences are not measurable, such as a personal aesthetic feeling, or a need for comfort, speed, safety etc. The aims of this paper are to demonstrate that these preferences can be classified and represented numerically, and to show that they are correlated with the type...

• Simplified method of water cooled exhaust system design.

  Publikacja

  • C. Dymarski
  • M. Narewski

  - Journal of Polish CIMEEAC - Rok 2016

  The water cooled exhaust systems are not often used onboard ships. Prime goal is to lower temperature of exhaust gas from main propulsion and auxiliary engines to the defined limit. The design of such systems require detailed analysis of propulsion system operational parameters to meet designer expectations. The paper outlines the cooled exhaust system design problems in specific application. The simplified method of evaluation...

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• Use of the AHP Method for Preference Determination in Yacht Design

  Publikacja

  • J. Sierzputowski
  • A. Karczewski
  • P. Krata

  - Polish Maritime Research - Rok 2023

  A sailing yacht is a human-centred product, the design of which revolves primarily around the wants and desires of the future owner. In most cases, these preferences are not measurable, such as a personal aesthetic feeling, or a need for comfort, speed, safety etc. The aims of this paper are to demonstrate that these preferences can be classified and represented numerically, and to show that they are correlated with the type of...

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• Thermal cooling process by nanofluid flowing near stagnating point of expanding surface under induced magnetism force: A computational case study

  Publikacja

  • F. Shahzad
  • W. Jamshed
  • A. A. Pasha
  • R. Safdar
  • M. M. Alam
  • M. Arshad
  • S. M. Hussain
  • M. B. Hafeez
  • M. Krawczuk

  - Case Studies in Thermal Engineering - Rok 2022

  This paper is dedicated to the exam of entropy age and research of the effect of mixing nanosolid additives over an extending sheet. In this review, Newtonian nanofluid version turned into researched at the actuated appealing field, heat radiation and variable heat conductivity results. With becoming modifications, the proven PDEs are moved into popular differential situations and paintings mathematically making use of a specific...

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• A method to assess transverse vibration energy of ship propeller shaft for diagnostic purposes

  Publikacja

  • Z. Korczewski

  - Polish Maritime Research - Rok 2017

  The article discusses a key problem of ship propulsion system vibration diagnostics, which concerns assessing this part of mechanical energy transmitted from the main engine to the ship propeller which is dissipated due to propeller shaft vibration. A simplified calculation model is proposed which allows the total energy of the generated torsional vibration to be assessed from the shaft deflection amplitude measured at the mind-span...

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• A Method for Underwater Wireless Data Transmission in a Hydroacoustic Channel under NLOS Conditions

  Publikacja

  • J. Mizeraczyk
  • R. Studanski,
  • A. Zak
  • A. Czapiewska

  - SENSORS - Rok 2021

  Wireless data transmission in the hydroacoustic channel under non-line-of-sight (NLOS) propagation conditions, for example, during a wreck penetration, is difficult to implement reliably. This is mostly due to the multipath propagation, which causes a reduction in the quality of data reception. Therefore, in this work an attempt has been made to develop a reliable method of wireless underwater communication test it under the NLOS...

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• A Generalized SDP Multi-Objective Optimization Method for EM-Based Microwave Device Design

  Publikacja

  • L. Ying
  • Q. Cheng
  • S. Kozieł

  - SENSORS - Rok 2019

  In this article, a generalized sequential domain patching (GSDP) method for efficient multi-objective optimization based on electromagnetics (EM) simulation is proposed. The GSDP method allowing fast searching for Pareto fronts for two and three objectives is elaborated in detail in this paper. The GSDP method is compared with the NSGA-II method using multi-objective problems in the DTLZ series, and the results show the GSDP method...

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• AgileSafe – a method of introducing agile practices into safety-critical software development processes

  Publikacja

  • K. Łukasiewicz
  • J. Górski

  - Annals of Computer Science and Information Systems - Rok 2016

  This article introduces AgileSafe, a new method of incorporating agile practices into critical software development while still maintaining compliance with the software assurance requirements imposed by the application domain. We present the description of the method covering the process of its application and the input and output artefacts.

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• Discrete Green's function approach to disjoint domain simulations in 3D FDTD method

  Publikacja

  • T. Stefański

  - ELECTRONICS LETTERS - Rok 2013

  A discrete Green’s function (DGF) approach to couple 3D FDTD subdomains is developed. The total-field/scattered-field subdomains are simulated using the explicit FDTD method whilst interaction between them is computed as a convolution of the DGF with equivalent current sources measured over Huygens surfaces. In the developed method, the DGF waveforms are truncated using the Hann’s window. The error varies in the range -65 to -40...

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• A study of the kinetics of bismuth telluride synthesis by an oxide reduction method

  Publikacja

  • B. J. Trawiński
  • B. Bochentyn
  • M. S. Łapiński
  • B. Kusz

  - THERMOCHIMICA ACTA - Rok 2020

  The kinetics of a reduction of bismuth and tellurium oxides in a hydrogen atmosphere, leading to the formation of thermoelectric bismuth telluride is investigated. The evaluation of the reaction kinetics was based on a thermogravimetric analysis performed in non-isothermal conditions. A non-parametric analysis method and the Friedman method were used for the evaluation of the data. Additionally, for a better understanding of the...

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• Crank–Nicolson FDTD Method in Media Described by Time-Fractional Constitutive Relations

  Publikacja

  • D. Trofimowicz
  • T. Stefański
  • J. Gulgowski

  - Rok 2024

  In this contribution, we present the Crank-Nicolson finite-difference time-domain (CN-FDTD) method, implemented for simulations of wave propagation in media described by time-fractional (TF) constitutive relations. That is, the considered constitutive relations involve fractional-order (FO) derivatives based on the Grünwald-Letnikov definition, allowing for description of hereditary properties and memory effects of media and processes....

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• Polynomial description of dynamic impedance spectrogram—introduction to a new impedance analysis method

  Publikacja

  • K. Darowicki
  • A. Zieliński
  • M. Mielniczek
  • E. Janicka
  • Ł. Gaweł

  - ELECTROCHEMISTRY COMMUNICATIONS - Rok 2021

  This paper presents a polynomial description of spectrograms obtained using Dynamic Electrochemical Impedance Spectroscopy. A method to fit the polynomial degree correctly is discussed. A simple electrical system of a diode connected in parallel with a capacitor was used for testing. Dynamic impedance measurements during potentiodynamic polarization were conducted. This paper presents an alternative analysis method that allows...

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• Improvement of Fingerprinting Method based on Hill Cipher by using Frequency Domain

  Publikacja

  • B. Czaplewski
  • R. Rykaczewski

  - Rok 2012

  The main goal of this paper is to present the advantages of a digital fingerprinting in a frequency domain over a pixel domain, in case of VoD services (Video on Demand). The paper presents basic issues of a multimedia data protection by digital fingerprinting. It also describes threats to embedded fingerprints from both collusion attacks and from a transmission itself. Possible solution was presented on the example of the DCT...

• Method of Decision-Making Logic Discovery in the Business Process Textual Data

  Publikacja

  • N. Rizun
  • A. Revina
  • V. Meister

  - Rok 2019

  Growing amount of complexity and enterprise data creates a need for novel business process (BP) analysis methods to assess the process optimization opportunities. This paper proposes a method of BP analysis while extracting the knowledge about Decision-Making Logic (DML) in a form of taxonomy. In this taxonomy, researchers consider the routine, semi-cognitive and cognitive DML levels as functions of BP conceptual aspects of Resources,...

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• OpenGL accelerated method of the material matrix generation for FDTD simulations

  Publikacja

  • S. Orłowski
  • T. Stefański

  - Rok 2014

  This paper presents the accelerated technique of the material matrix generation from CAD models utilized by the finite-difference time-domain (FDTD) simulators. To achieve high performance of these computations, the parallel-processing power of a graphics processing unit was employed with the use of the OpenGL library. The method was integrated with the developed FDTD solver, providing approximately five-fold speedup of the material...

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• Method of selecting programming practices for the safety-critical software development projects

  Publikacja

  • K. Łukasiewicz

  - Rok 2019

  In recent years a plan-driven approach traditionally used in safety-critical software development has been put to a test by rapidly changing technologies, more diverse group of clients and volatile market requirements. The need to deliver good quality systems, faster and at lower cost in comparison to competitors encouraged companies to look for more efficient solutions. Agile methodologies are known to successfully address these...

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• A Novel Bitrate Adaptation Method for Heterogeneous Wireless Body Area Networks

  Publikacja

  • K. Cwalina
  • S. J. Ambroziak
  • P. Rajchowski
  • J. Sadowski
  • J. Stefański

  - Rok 2019

  In the article, a novel bitrate adaptation method for data streams allocation in heterogeneous Wireless Body Area Networks (WBANs) is presented. The efficiency of the proposed algorithm was compared with other known algorithms of data stream allocation using computer simulation. A dedicated simulator has been developed using results of measurements in the real environment. The usage of the proposed adaptive data streams allocation...

• A Novel Bitrate Adaptation Method for Heterogeneous Wireless Body Area Networks

  Publikacja

  • K. Cwalina
  • S. J. Ambroziak
  • P. Rajchowski
  • J. Sadowski
  • J. Stefański

  - Applied Sciences-Basel - Rok 2018

  In the article, a novel bitrate adaptation method for data streams allocation in heterogeneous Wireless Body Area Networks (WBANs) is presented. The efficiency of the proposed algorithm was compared with other known algorithms of data stream allocation using computer simulation. A dedicated simulator has been developed using results of measurements in the real environment. The usage of the proposed adaptive data streams allocation...

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• A dressing method in mathematical physics

  Publikacja

  • E. V. Doktorov
  • S. Leble

  - Rok 2007

  Metodę ubierania stosuje się do równań nieliniowych całkowalnych i w teorii potencjałów całkowalnych mechaniki kwantowej.

• Parallelization Method for a Continuous Property

  Publikacja

  • P. Pilarczyk

  - FOUNDATIONS OF COMPUTATIONAL MATHEMATICS - Rok 2010

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• THE METHOD OF MEASURING THE MEMBRANE COVER GEOMETRY USING LASER SCANNING AND SYNCHRONOUS PHOTOGRAMMETRY

  Publikacja

  • A. Janowski
  • W. Kamiński
  • K. Makowska-Jarosik
  • J. Szulwic
  • K. Wilde

  - Rok 2015

  The authors present the experience and results of field studies carried out at the technical acceptance of Forest Opera (name in Polish: Opera Leśna) in Sopot (Poland). An unusual design of covering made in the form of “Sheerfill I” technical fabric membrane required spanned in the form of sails, required the use of terrestrial laser scanning. Such approach allowed for the fast and accurate record of the surface of individual panels...

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• A method of RTS noise identification in noise signals of semiconductor devices in the time domain

  Publikacja

  • B. Stawarz-Graczyk
  • D. Dokupil
  • P. Flisikowski

  - Metrology and Measurement Systems - Rok 2010

  In the paper a new method of Random Telegraph Signal (RTS) noise identification is presented. The method is based on a standardized histogram of instantaneous noise values and processing by Gram-Charlier series. To find a device generating RTS noise by the presented method one should count the number of significant coefficients of the Gram-Charlier series. This would allow to recognize the type of noise. There is always one (first)...

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• FDTD Method for Electromagnetic Simulations in Media Described by Time-Fractional Constitutive Relations

  Publikacja

  • P. Pietruszka
  • T. Stefański
  • J. Gulgowski

  - Applied Sciences-Basel - Rok 2023

  In this paper, the finite-difference time-domain (FDTD) method is derived for electromagnetic simulations in media described by the time-fractional (TF) constitutive relations. TF Maxwell’s equations are derived based on these constitutive relations and the Grünwald–Letnikov definition of a fractional derivative. Then the FDTD algorithm, which includes memory effects and energy dissipation of the considered media, is introduced....

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• Application of Wavelet Transform and Fractal Analysis for Esophageal pH-Metry to Determine a New Method to Diagnose Gastroesophageal Reflux Disease

  Publikacja

  • P. Tojza
  • Ł. Doliński
  • G. Redlarski
  • J. Szkopek
  • M. A. Dąbkowski
  • M. Janiak

  - Applied Sciences-Basel - Rok 2023

  In this paper, a new method for analysing gastroesophageal reflux disease (GERD) is shown. This novel method uses wavelet transform (WT) and wavelet-based fractal analysis (WBFA) on esophageal pH-metry measurements. The esophageal pH-metry is an important diagnostic tool supporting the physician’s work in diagnosing some forms of reflux diseases. Interpreting the results of 24-h pH-metry monitoring is time-consuming, and the conclusions...

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• Detection of the First Component of the Received LTE Signal in the OTDoA Method

  Publikacja

  • G. Paweł
  • J. Sadowski
  • J. Stefański

  - WIRELESS COMMUNICATIONS & MOBILE COMPUTING - Rok 2019

  In a modern world there is a growing demand for localization services of various kinds. Position estimation can be realized via cellular networks, especially in the currently widely deployed LTE (Long Term Evolution) networks. However, it is not an easy task in harsh propagation conditions which often occur in dense urban environments. Recently, time-methods of terminal localization within the network have been the focus of attention,...

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• EXPERIMENTAL AND NUMERICAL VALIDATION OF THE IMPROVED VORTEX METHOD APPLIED TO CP745 MARINE PROPELLER MODEL

  Publikacja

  • P. Król
  • K. Tesch

  - Polish Maritime Research - Rok 2018

  The article presents a numerical analysis of the CP745 marine propeller model by means of the improved vortex method and CFD simulations. Both numerical approaches are validated experimentally by comparing with open water characteristics of the propeller. The introduced modification of the vortex method couples the lifting surface approach for the propeller blades and the boundary element method for the hub. What is more, a...

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• DiSTFAG method robust to gross errors in monitoring displacements and strains in unstable reference systems

  Publikacja

  • W. Kamiński

  - Geodesy and Cartography - Rok 2011

  The DiSTFA method (Displacements and Strains using Transformation and Free Adjustment) was presented in Kamiński (2009). The method has been developed for the determination of displacements and strains of engineering objects in unstable reference systems, as well as for examining the stability of reference points. The DiSTFAG (Gross errors) method presented in the paper is the extension of the DiSTFA method making it robust to...

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• Proposal of a method for effective tasks distribution in the execution of compolex problems

  Publikacja

  • M. Wójcik

  - Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne - Rok 2011

  An access to a great number of various services allows for decomposition of complex problems into smaller and less complex tasks. Those tasks can be presented in a form of a dependency graph. This paper shows an idea of executing such a problem using cooperating autonomous agents. Main focus of this work is cooperation covering effective tasks distribution among executors. This paper presents an algorithm for dynamic executor selection...

• Bearing capacity of working platform using distinct layout optimization method

  Publikacja

  • L. Bałachowski
  • K. Białek

  - Rok 2015

  Bearing capacity of the working platforms from sandy soil resting on NC and OC clays was analyzed using LimitState GEO program. Different failure modes are considered using distinct layout optimization (DLO) method, which forms the upper bound solution of limit state analysis. Different mechanisms of failure were observed as a function of the platform thickness, angle of internal friction of the platform material and undrained...

• An Efficient Simulation Method of Massive MIMO Antenna Arrays used in 5G Mobile Phones

  Publikacja

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

  - Rok 2020

  This paper deals with a model-order reduction method, applied to speed-up the simulations of MIMO antenna arrays, performed by means of finite element method. The obtained results of the numerical tests show that the described technique is reliable and considerably increases the efficiency of the standard finite element method.

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• INTEGRATED FUNCTIONAL SAFETY AND CYBERSECURITY ANALYSIS METHOD FOR SMART MANUFACTURING SYSTEMS

  Publikacja

  • K. Kosmowski
  • M. Śliwiński
  • J. Piesik

  - TASK Quarterly - Rok 2019

  This article addresses integrated functional safety and cybersecurity analysis with regard to: the generic functional safety standard IEC 61508 and the cyber security standard IEC 62443 concerning an industrial automation and control system (IACS). The objective is to mitigate the vulnerability of information technology (IT) and operational technology (OT) systems, and reduce relevant risks taking into account a set of fundamental...

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• Hybrid Multi-Criteria Method of Analyzing the Location of Distributed Renewable Energy Sources

  Publikacja

  • A. Lenarczyk

  - ENERGIES - Rok 2020

  This paper presents the development and the application of a hybrid multi-criteria method, the combination of the Analytic Hierarchy Process (AHP), and numerical taxonomy (NT),to support the decision making on the location of distributed renewable energy sources meetingvarious types of assessment criteria. Finding criteria weights, using the AHP method, eliminates thedisadvantage of NT—which, in current form, is defined by its...

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• Noninvasive method for rotor fault diagnosis in inverter fed induction motor drive

  Publikacja

  • P. Kołodziejek

  - Rok 2013

  This article presents a proposal, simulation and experimental results of a noninvasive rotor fault diagnosis method for the inverter fed induction motor drive. Comparing to reported methods the proposed one does not require any load, rotor brake, slip, mechanical or electrical system physical modification e.g. machine disassembly and can be applied regardless the rotor speed measurement or estimation method.

• Macromodels for Efficient Analysis of Open-Region Problems Using the Finite Element Method

  Publikacja

  • D. Szypulski
  • M. Mul
  • K. Nyka
  • G. Fotyga

  - Rok 2019

  This paper presents a local model-order reduction, called macromodeling, applied to speed-up the simulations of open-region problems, analyzed by means of finite element method. This technique is illustrated by a numerical example, which deals with a dielectric resonator antenna (DRA). The obtained results show that the proposed approach is reliable and can significantly increase the standard finite element method efficiency.

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• Wideband Model Order Reduction for Macromodels in Finite Element Method

  Publikacja

  • G. Fotyga
  • K. Nyka

  - Rok 2016

  Abstract: This paper presents a novel algorithm for accelerating 3D Finite Element Method simulations by introducing macromodels created in local model order reduction in the selected subdomains of the computational domain. It generates the projection basis for a compact system of equations associated with a separate subdomain. Due to non-linear frequency dependency in the Right Hand Side (RHS), the standard reduction methods do...

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• SAILING ROUTE PLANNING METHOD CONSIDERING VARIOUS USER CATEGORIES

  Publikacja

  • M. Życzkowski

  - Polish Maritime Research - Rok 2020

  The article describes the methodology related to determining the multi-criteria routes for sailing ships. Details of sea area discretisation and discretisation of the description of the sailing vessel properties and manoeuvring principles are shown. User requirements were specified (for five different categories of users) and on this basis the criteria for selecting the most suitable shipping route were formulated. The presented...

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• Active dynamic thermography method for TRAM flap blood perfusion mapping in breast reconstruction

  Publikacja

  • M. Moderhak
  • S. Kołacz
  • J. Jankau
  • T. Juchniewicz

  - QIRT Journal - Rok 2017

  This paper presents the new method of the transverse rectus abdominis musculocutaneous flap blood perfusion mapping based on the active dynamic thermography. The method is aimed at aiding a surgeon during breast reconstruction procedure. A pair of dTnorm and t90_10 parameters were used as parametric image descriptors of the flap blood perfusion. The method was tested on 38 patients that were subjected to breast reconstruction procedure....

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• A new viscoelastic method of calculation of low-temperature thermal stresses in asphalt layers of pavements

  Publikacja

  • J. Judycki

  - International Journal of Pavement Engineering - Rok 2018

  The paper presents a new method of calculation of thermal stresses in asphalt layers of pavements induced by cooling or heating. The method, developed by the author, is based on the analytical solution for the linear viscoelastic Burgers model extended numerically for the case of asphalt layers whose rheological parameters are strongly dependent on temperature. The coefficient of thermal expansion and Poisson’s ratio may optionally...

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• A method to synthesise groove cam Geneva mechanisms with increased dwell period

  Publikacja

  • V. Pasika
  • P. Nosko
  • O. Nosko
  • O. Bashta
  • V. Heletiy
  • V. Melnyk

  - PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE - Rok 2024

  The present study develops a method to synthesise the groove cam Geneva mechanism with increased dwell period. The main condition of the synthesis is to provide the desired law of motion of the wheel. Additional synthesis conditions are the limitation of the maximum pressure angle and the limitation of the minimum curvature radius of the cam profile. Unlike the conventional Geneva mechanisms, the synthesised groove cam Geneva mechanisms...

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• The analytical design method of railway route’s main directions intersection area

  Publikacja

  • W. Koc

  - Open Engineering - Rok 2016

  The paper presents a design method related to railway track sections situated in a bend. In the method advantage is taken of an analytical form of description by using appropriate mathematical formulae. This may becomeparticularly usefulwhen the investigations are based on the data obtained from mobile satellite measurements. In the paper attention is concentrated on an universal approach creating an opportunity to diversify the...

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• Novel method of lung area extraction in chest perfusion computed tomography

  Publikacja

  • R. Kalicka
  • S. Lipiński
  • M. Browarczyk

  - BIOMEDIZINISCHE TECHNIK - Rok 2013

  Chest perfusion computed tomography (pCT) is a useful technique in the medical diagnosis of how organs function. Perfusion CT scans are used to calculate perfusion parameters. In the case of automated methods of lung perfusion parameters calculation, the prior extraction of the lung area is desired to avoid unnecessary calculation in an area outside the lung cross-section and to avoid wasting time on processing signals of no diagnostic...

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• APPLICATION OF THE KOSECKI’S METHOD IN DESIGNING OF OFFSHORE WIND POWER PLANTS FOUNDATION

  Publikacja

  • K. Mikina
  • P. Więcławski

  - ACTA SCIENTIARUM POLONORUM. SERIA: ARCHITECTURA - Rok 2018

  The concept of offshore wind power plants has been well developed in many European countries. There is no such thing as design of offshore wind power plants according to national tradition. The main problem is the lack of standards and guidelines. Ones being applied are Scandinavian or American methods which are not fully adapted to the conditions of the Baltic Sea. The article focuses on the monopile design, as it is currently the...

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• Investigation method of large-volume tire with mobile test rig

  Publikacja

  • K. Centkowski

  - Rok 2017

  The goal of this research is to develop the tire test method and mobile tire test rig. The test rig enables measurement of tire properties as stiffness and viscous damping in vertical direction, and tire–ground characteristics on the asphalt rigid surface. The tire-ground characteristics are measured by force and a torque measurement hub. The design, calibration and the algorithm for calculating the forces in the wheel center are...

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• Parametrical Method for Determining Optimal Ship Carrying Capacity and Performance of Handling Equipment

  Publikacja

  • J. Michalski

  - Polish Maritime Research - Rok 2016

  The paper presents a method of evaluating the optimal value of the cargo ships deadweight and the coupled optimal value of cargo handling capacity. The method may be useful at the stage of establishing the main owners requirements concerning the ship design parameters as well as for choosing a proper second hand ship for a given transportation task. The deadweight and the capacity are determined on the basis of a selected economic...

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• Velocity measurement using the fdoa method in ground-based radio navigation system

  Publikacja

  • J. Sadowski

  - Metrology and Measurement Systems - Rok 2014

  Velocity is one of the main navigation parameters of the moving objects. However some systems of position estimation using radio wave measurements cannot provide velocity data due to limitation of their performance. In this paper a velocity measurement method for DS-CDMA radio navigation system is proposed, which doesn’t require full synchronization of reference stations carrier frequencies. The article presents basics of FDOA...

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• Receiver-side fingerprinting method for color images based on a series of quaternion rotations

  Publikacja

  • B. Czaplewski
  • R. Rykaczewski

  - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Rok 2015

  The proposed method is a new Joint Fingerprinting and Decryption (JFD) method that uses a cipher based on quaternion rotation to encrypt color images that are then sent to all users via multicast transmission. Individual encryption keys depend on the users’ fingerprints, so that a unique fingerprint is introduced into the image during decryption for each decryption key. A simulation-based research was conducted to examine the method’s...

• A method of determination of electrical conduction mechanisms in complex amorphous materials

  Publikacja

  • P. Kupracz
  • N. A. Wójcik
  • R. J. Barczyński

  - JOURNAL OF NON-CRYSTALLINE SOLIDS - Rok 2018

  A novel approach to determine conduction mechanisms in complex amorphous materials was presented and tested on a real system. In the first step of the presented method, total electrical admittance of the material is analyzed in order to separate a couple of processes, each of which can be described by Jonscher's universal dielectric response. In the following step, a temperature dependence of dielectric response parameters of the...

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• Matrix-based robust joint fingerprinting and decryption method for multicast distribution of multimedia

  Publikacja

  • B. Czaplewski
  • R. Rykaczewski

  - SIGNAL PROCESSING - Rok 2015

  This paper addresses the problem of unauthorized redistribution of multimedia content by malicious users (pirates). The solution proposed here is a new joint fingerprinting and decryption method which meets the requirements for both imperceptibility and robustness of fingerprints and scalability in terms of design and distribution of fingerprinted multimedia content. The proposed method uses a simple block cipher based on matrix...

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• Quechers sample preparation method variants for analysis of pesticide residues in fruits and vegetables

  Publikacja

  • J. Stocka
  • M. Tankiewicz

  - Rok 2012

  This article describes the comparison of different versions of an easy, rapid and low-cost sample preparation approach for the determination of pesticide residues in fruits and vegetables by concurrent use of gas and liquid chromatography coupled to MS or ECD for detection. The sample preparation approach is known as QuEChERS, which stands for quick, easy, cheap, effective, rugged and safe. It is a combination of liquid-liquid...

• Structural reliability of overhead power lines by means of Monte Carlo Method and RSM

  Publikacja

  • K. Winkelmann
  • J. Bosch Llufriu
  • J. Górski

  - Rok 2015

  The article discusses the issue of reliability assessment of overhead power lines by means of both Monte Carlo Method and Response Surface Method. The suspension tower OS24 ON150+10 is considered, as the weakest element of the line. A comparison is made between deterministic and probabilistic approaches to wind and icing loading. The PDFs for wind and icing loads are proposed. Reliability is assessed for both critical atmospheric...

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• DETERMINATION OF DIFFUSIBLE HYDROGEN CONTENT IN DEPOSITED METAL OF RUTILE ELECTRODES BY GLYCERIN METHOD

  Publikacja

  • D. Fydrych
  • J. Tomków
  • A. Świerczyńska

  - Metallurgy and Foundry Engineering - Rok 2013

  The presence of diffusible hydrogen in welded joints is one of the causes of formation the welding imperfections. Improvement of weldability can be achieved by reducing the hydrogen amount in welded joints. This requires, among others, the finding of sources of hydrogen. For high hydrogen processes the commonly used method of determining the diffusible hydrogen amount is the glycerin method. This paper concerns issues related to...

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• A new time-frequency detection method of stray current field interferenceon metal structures.

  Publikacja

  • K. Darowicki
  • K. Żakowski

  - CORROSION SCIENCE - Rok 2004

  A new detection method has been presented of stray current field interference on underground metal structures. The method employs short time Fourier transformation (STFT). This method of analysis allows determination of signal spectral power density changes (e.g., structure potential) in the function of time. In the paper results have been presented of total time–frequency analysis of a pipeline potential in a stray current field...

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• Immunizing the Hillcast Method against the Known-Plaintext Attack using Periodic Key Exchange

  Publikacja

  • B. Czaplewski
  • R. Rykaczewski

  - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Rok 2013

  This paper considers a Joint Fingerprinting and Decryption method, called Hillcast, for the copyright protection and traitor tracing in case of Video on Demand services. Because the method is based on the Hill cipher, it is vulnerable to a known-plaintext attack. The goal of this paper is to present an efficient periodic key exchange mechanism to make this method secure without compromising its scalability, imperceptibility or...

• Measuring pulse rate with a webcam — A non-contact method for evaluating cardiac activity

  Publikacja

  • M. Madej
  • J. Rumiński
  • T. Kocejko
  • J. Nowak

  - Rok 2011

  In this paper the simple and robust method of measuring the pulse rate is presented. Elaborated algorithm allows for efficient pulse rate registration directly from face image captured from webcam. The desired signal was obtained by proper channel selection and principal component analysis. A developed non-contact method of heart rate monitoring is shown in the paper. The proposed technique may have a great value in monitoring...

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• LSTM-based method for LOS/NLOS identification in an indoor environment

  Publikacja

  • A. Olejniczak
  • O. Błaszkiewicz
  • K. Cwalina
  • P. Rajchowski
  • J. Sadowski

  - Rok 2020

  Due to the multipath propagation, harsh indoor environment significantly impacts transmitted signals which may adversely affect the quality of the radiocommunication services, with focus on the real-time ones. This negative effect may be significantly reduced (e.g. resources management and allocation) or compensated (e.g. correction of position estimation in radiolocalisation) by the LOS/NLOS identification algorithm. This paper...

• Positive solutions of three-point boundary value problems for second order impulsive differential equations with advanced arguments

  Publikacja

  • T. Jankowski

  - APPLIED MATHEMATICS AND COMPUTATION - Rok 2008

  W pracy dyskutowano problem istnienia dodatnich rozwiązań dla równań różniczkowych z impulsami rzędu drugiego i z argumentami typu wyprzedzonego. Podano warunki dostateczne na istnienie jednego lub dwóch rozwiązań dodatnich takich zagadnień.

• Combined operation of 900MW power plant with the ORC through the bleed steam extraction point and CO2 recovery system

  Publikacja

  • D. Mikielewicz
  • P. Ziółkowski
  • J. Wajs
  • J. Mikielewicz

  - Rok 2014

  The work presented here is aimed at utylisation of waste heat in the reference supercritical power plant in the manner to produce electricity in ORC installation. The waste heat is available in the form of a stream of hot water at 90 C, recovered from the exhaust gases in the amount of 200MW. Such low enthalpy heat source is rather insufficient to produce a good quality vapour to feed the ORC turbine. Therefore an original approach...

• Tipping point in plant–fungal interactions under severe drought causes abrupt rise in peatland ecosystem respiration

  Publikacja

  • V. Jassey
  • M. Reczuga
  • M. Zielińska
  • S. Słowińska
  • B. Robroek
  • P. Mariotte
  • C. Seppey
  • E. Lara
  • J. Barabach
  • M. Słowiński... i 5 innych

  - GLOBAL CHANGE BIOLOGY - Rok 2018

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• Positive solutions for three-point one-dimensional p-Laplacian boundary value problems with advanced arguments [online]

  Publikacja

  • T. Jankowski

  - APPLIED MATHEMATICS AND COMPUTATION - Rok 2009

  Praca dotyczy problemów istnienia dodatnich rozwiązań dla trzy-punktowych zagadnień brzegowych z wyprzedzonymi argumentami. Zastosowano twierdzenie Avery-Petersona o punkcie stałym aby uzyskać warunki dostateczne na istnienie conajmniej trzech dodatnich rozwiązań.

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