2021 - Publications Repository - Gdańsk University of Technology

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Publications from the year 2021

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Assessment of OpenMP Master–Slave Implementations for Selected Irregular Parallel Applications
- Paweł Czarnul
2021 Full text Electronics
The paper investigates various implementations of a master–slave paradigm using the popular OpenMP API and relative performance of the former using modern multi-core workstation CPUs. It is assumed that a master partitions available input into a batch of predefined number of data chunks which are then processed in parallel by a set of slaves and the procedure is repeated until all input data has been processed. The paper experimentally assesses performance of six implementations using OpenMP locks, the tasking construct, dynamically partitioned for loop, without and with overlapping merging results and data generation, using the gcc compiler. Two distinct parallel applications are tested, each using the six aforementioned implementations, on two systems representing desktop and worstation environments: one with Intel i7-7700 3.60 GHz Kaby Lake CPU and eight logical processors and the other with two Intel Xeon E5-2620 v4 2.10 GHz Broadwell CPUs and 32 logical processors. From the application point of view, irregular adaptive quadrature numerical integration, as well as finding a region of interest within an irregular image is tested. Various compute intensities are investigated through setting various computing accuracy per subrange and number of image passes, respectively. Results allow programmers to assess which solution and configuration settings such as the numbers of threads and thread affinities shall be preferred.
Assessment of particular abdominal aorta section extraction from contrast-enhanced computed tomography angiography
- Tomasz Dziubich
- Artur Skrzynecki
- Marcin Perdeusz
2021
The aim of this work is to improve the accuracy of extraction of a particular abdominal aorta section and to reduce the distortion in three-dimensional Computed Tomography Angiography (CTA) images. Imaging modality and quality plays crucial role in the medical diagnostic process, thus ensuring high quality of images is essential at every stage of acquisition and processing.Noise is defined as a disturbance of the image quality that characterized by the presence of pixels that are not desired in the image. Removing or reducing the occurrence of the noise is still a challenging problem in the image processing field. We selected denoising or smoothing methods, such as Gaussian, anisotropic, Taubin, and Laplace filter. This work was carried out as a part of the aorta segmentation software which can detect and display abdominal aorta ROI. We embedded the denoising methods in the system in order to smoothen and to enhance the detection of the contour and surface of the vasculature, which subsequently leads to more accurate segmentation results and extraction particular segment of aorta. We compare the performance of method by using the aortic segmentation result represented in the form of the Dice Similarity Coefficient. Gaussian smoothing is one noise reduction technique that obtained the best in segmentation (average Dice similarity coefficient 0.9103 ±0.04. The results showed that the segmentation results presented in this work are promising, although not all the visualization was well maintained.
Assessment of Tensile Strength Reserve of Asphalt Mixtures at Low Temperatures
- Marek Pszczoła
- Cezary Szydłowski
2021 Full text
During winter conditions, low-temperature cracks develop at the surface of the asphalt pavement when tensile thermal stress induced in the asphalt layer during cooling equals and exceeds the tensile strength of the material. The paper presents the results of tensile strength reserve assessment of asphalt mixtures with neat and SBS-polymer modified bitumen application. The tensile strength reservewas calculated as difference between the tensile strength βt(T) obtained from the uniaxial tension stress test (UTST) and the cryogenic (thermal) stress σcry(T) obtained from the thermal stress restrained specimen test (TSRST) at the same temperature T. It can be useful factor assessing the low-temperature properties of asphalt mixtures. It was found that the highest values of tensile strength reserve were obtained for the asphalt mixture with SBS-polymer modified bitumen.
Assessment of the devulcanization process of EPDM waste from roofing systems by combined thermomechanical/microwave procedures
- Xavier Colom
- Javier Cañavate
- Krzysztof Formela
- Alireza Shadman
- Mohammad Saeb
2021 Full text POLYMER DEGRADATION AND STABILITY
Ethylene-propylene-diene rubber (EPDM) is a elastomer widely used in common industrial applications. EPDM can be shaped into sheets and employed as isolating material for roofing systems. In this study, scraps of EPDM from commercial, industrial and residential roofing systems were treated by combined thermo-mechanical and microwave devulcanization processes including peroxide of benzoyl (BPO). The devulcanized EPDM (Dev-EPDM) was characterized by cross-link density, Horikx plot, sol fraction content, SEM and TGA analysis. In order to assess the effect of the different factors implied (type of devulcanization process, temperature and amount of BPO), the Fractional Factorial Design (FFD) method has been applied. The obtained results show that, when thermo-mechanical and microwave methods are combined, produce an intense devulcanization effect. It was also found that the presence of BPO has significative influence in the devulcanization and that the effect of the temperature is related to the amount of BPO.
Assessment of the factors influencing on the formation of energy-oriented modes of electric power consumption by water-drainage installations of the mines
- Oleg Sinchuk
- Igor Sinchuk
- Tetyana Beridze
- Yulii Filipp
- Kyrylo Budnikov
- Oleg Dozorenko
- Ryszard Strzelecki
2021 Full text Mining of Mineral Deposits
Purpose. Performing the analysis to determine energy-efficient modes and assess the characteristics of the main indicators of electric power consumption by mine water-drainage installations based on the developed research mathematical model. Methods. To achieve the purpose set, a methodology is used to develop the multiple multifactor correlation-regression modeling with respect to the modes of electric power consumption by electrical and mechanical complexes of mine waterdrainage installations. The amount of consumed electric power is found as an effective feature. The expediency of using the nonlinear multiple regression analytical ratios has been substantiated during the model development. A comparative analysis of a multiple multifactor regression model, presented in the form of a power and linear function, has been performed. Findings. The expediency of using a multiple multifactor regression model in the form of a power function has been substantiated. The elaborated quantitative values of the factors of electric power consumption by electrical and mechanical complexes of mine waterdrainage installations have become the basis for the introduction of innovative technological solutions at the relevant iron ore enterprises to optimize the cost characteristics of the electric power consumption. Originality. For the first time for the analysis and assessment of the operating modes of the main water-drainage installations of mines, the use of mathematical modeling based on the multiple correlation-regression method is proposed. The developed model takes into account a complex of technological parameters of influence on the water-pumping process. The analysis of the proposed model makes it possible to identify significant factors influencing the modes of electric power consumption by electrical and mechanical complexes for constructing an algorithm for optimal control of this process in the cost-target direction. Practical implications. The analysis of the obtained results of mathematical and statistical modeling makes it possible to take into account the complex of technological parameters of the influence on the water-pumping process, to identify and assess the modes of electric power consumption by the main waterdrainage installations, as well as to obtain the initial data for the development of the structure of the control algorithm for mine stationary installations of this type in the cost-target aspect.
Assessment of the ice jam potential on regulated rivers and reservoirs with the use of numerical model results
- Tomasz Kolerski
2021 Full text COLD REGIONS SCIENCE AND TECHNOLOGY
This study presents an attempt at estimating the jam potential on rivers with significant anthropogenic intervention in the course or flow characteristics of the river. The DynaRiCE model was used for forecasting both the place and time of an ice jam occurrence. In this modified method, two ice parameters are subjected to analysis, namely the relative ice-to-water velocity (vi/vw),and the ice thickness to single floe thickness (ηi/η0). Both variables were analyzed at two locations; first spot is the Odra River near Słubice-Frankfurt bridge (between 581 and 586 km), and the second is the Vistula section between the existing Włocławek dam (674.75 river km) and the planned Siarzewo dam (706.38 river km), covering a 31.6 km reach. Once the model is implemented in the selected areas, the numerical simulations were processed and the obtained results were analyzed in terms of ice accumulation and jamming. The results on both rivers shown some potential of ice jamming, due to the planned engineering works. In the case of the Odra river, it was indicated that ice jam potential increased during the ice run of high concentration in the average flow conditions. For the Vistula river two locations for ice jamming were designated and for both of the points an increase of the ice thickness by about 60% from the initial, single flow thickness was observed. Also in this case, the area-averaged ice velocity in an initially specified location drops below 15% of the average water velocity in that area. According to the used methodology, both cases are classified as ‘ice jam probable’ type.
Assessment of the Influence of Road Infrastructure Parameters on the Behaviour of Drivers and Pedestrians in Pedestrian Crossing Areas
- Marcin Budzyński
- Anna Gobis
- Lucyna Gumińska
- Łukasz Jeliński
- Mariusz Kieć
- Piotr Tomczuk
2021 Full text ENERGIES
Pedestrians are participants and, most likely, fatalities in every third road traffic accident in Poland. Over 30% of all fatalities on Polish roads are pedestrians. Accidents with pedestrians are very often the result of various factors related to the infrastructure and behaviour of pedestrians and drivers. The objective of the work was to assess driver and pedestrian behaviour in pedestrian crossing areas. The research also served as a pilot study for similar work to be conducted across Poland, and constituted the basis for monitoring the behaviour of road users in the area of pedestrian crossings. Parameters which must be analysed were identified on the basis of field studies. Principles of selecting test sites were adopted, and measurement methods for pedestrian crossing areas are presented. The influence of the location of the selected test cross-section infrastructure parameters on the behaviour of road users in pedestrian crossing areas is demonstrated. The results of the study will be used as a basis for new solutions involving pedestrian crossing infrastructure designed to improve pedestrian safety. The results were also used in formulating new regulations for the design and maintenance of pedestrian crossings and recommendations for road safety auditors.
Assessment of User Mobility’s Influence on System Loss in Several Body-to-Body Scenarios
- Filipe D. Cardoso
- Manuel M. Ferreira
- Andrzej Ambroziak
- Kenan Turbić
- Luis M. Correia
2021 Full text
In this paper, Body-to-Body communications in indoor and outdoor environments for different on-body antenna configurations and different mobility scenarios were studied, based on system loss measurements at 2.45 GHz. The main objective is to properly characterise the influence of the Transmitter-Receiver configuration on system loss and fast fading behaviour, the latter being modelled by the Rice Distribution. Globally, it is observed that there is no significant difference on the measured average system loss between indoor and outdoor environments, but a strong dependence is seen on the configuration of the antennas and on the mobility scenario. Concerning the Rice Factor, as expected, higher values were obtained in outdoor environments, due to the lower level of multipath, the difference to the indoor case being below 4 dB, depending on the mobility environment and on the positioning of the antennas.
ASSESSMENT OF VOLATILE ORGANIC COMPOUNDS EMISSIONS FROM RECYCLED LOW-DENSITY POLYETHYLENE STREAMS
- Jerzy Korol
- Aleksander Hejna
- Mariusz Marć
2021 Full text
The recycling of plastics is currently one of the most significant industrial challenges. Due to the enormous amounts of plastic wastes generated by various industry branches, it is essential to look for the potential methods of their utilization. Nevertheless, it should not be forgotten that recycled plastics are not pure materials, and they still may show an unfavorable environmental impact. They may contain different contaminants accumulated during processing processes, as well as their use. Moreover, post-consumer plastics may be partially degraded due to the actions of stress, temperature, or environmental conditions. Therefore, it is imperative to investigate the actual environmental impact and eco-friendliness of recycled plastics. In the presented paper, we analyzed the volatile organic compounds emissions from recycled low-density polyethylene streams. Results indicated that the application of recycled plastics should not be indisputably considered the environmentally-friendly solution.
Assessment of wastewater quality indicators for wastewater treatment influent using an advanced logistic regression model
- Bartosz Szeląg
- Mohammad Javad Mehrani
- Jakub Drewnowski
- Monika Majewska
- Grzegorz Łagód
- Sheena Kumari
- Faizal Bux
2021 Desalination and Water Treatment
Influent quality indicators play a significant role in wastewater treatment plant performance due to their correlation with reactor operations and effluent quality. However, selecting a specific/best parameter indicator for predicting influent wastewater quality is one of the challenges in wastewa- ter treatment. This study, therefore, focused on determining suitable variables as influent quality indicators. For this purpose, a logistic regression model involving different inflow parameters from two wastewater treatment plants in Poland was used to identify the best wastewater parameter as a suitable indicator for operational monitoring, process control and simulation purpose. The results showed that the model is flexible enough to simultaneously predict two or three effective waste- water quality indicators. Furthermore, the sensitivity analysis results showed a strong nonlinear relationship between the complex values of total nitrogen, total phosphorus and suspended solids.
Asymmetrical Modes in Polyphase Motors and Drives
- Valentin Tomasov
- A Usoltsev
- Marcin Morawiec
- Paweł Szczepankowski
- Ryszard Strzelecki
2021 Russian Electrical Engineering
The effect of power supply and/or motor asymmetry on the phase-load distribution and the ripple of electromagnetic torque in a polyphase drive is studied by the method of symmetrical components. It is shown that the presence of asymmetry causes the mapping of all harmonics in the supply voltage into all planes of symmetrical components and eliminates the possibility of independent control of harmonics. The dynamic model of a five-phase squirrel-cage induction motor demonstrates that even minor phase or amplitude asymmetry causes asymmetry in the phase load and ripple of the electromagnetic torque. Their level eliminates the possibility of continuous operation of the motor in this mode and requires the use of control systems that provide load balance in the intact phases.
Atmospheric deposition of microplastics in the coastal zone: Characteristics and relationship with meteorological factors
- Karolina Szewc
- Bożena Graca
- Anna Dołęga
2021 SCIENCE OF THE TOTAL ENVIRONMENT
The quantitative and qualitative compositions of microplastics (MPs) deposited from the atmosphere in the coastal zone were analysed. Moreover, links between MP deposition and meteorological factors (air humidity, wind speed, precipitation height, and air mass trajectories) were investigated
Atom-economic thiophosphoroselenenylations of C–H acid esters and amides
- Arkadiusz Majewski
- Witold Przychodzeń
2021 Full text SYNTHETIC COMMUNICATIONS
Three improved thiophosphoroselenenylation procedures of CHacids, including derivatives of malonic and acetyl-, phosphono-, 4-nitrophenyl- and 3-pyridylacetic acids, have been described and compared to previously reported thiophosphoroselenylation of diethyl malonate using bis(disopropoxyphosphinothioyl)diselenide alone or with the aid of methyl iodide. The use of iodine makes it possible to utilize both equivalents of the selenenylating agent. The procedures work well for the majority of nucleophiles in a pKa range between more acidic malononitrile or Meldrum acid and less acidic phenylacetates. The reaction carried out on diethyl malonate in boiling rectified ethanol yields selenoacetate, which cannot be obtained by direct phosphoroselenenylation. Crystal structure of one of the selenomalonamides confirms the stabilization effects of both carbonyl oxygens on selenium atom. The P-Se bond splitting, using TBAF in 3-molar excess in the presence of alkylating agent yields the respective C,Se-dialkyl derivatives.
Automatic Identification System (AIS) Dynamic Data Integrity Monitoring and Trajectory Tracking Based on the Simultaneous Localization and Mapping (SLAM) Process Model
- Krzysztof Jaskólski
- Łukasz Marchel
- Andrzej Felski
- Marcin Jaskólski
- Mariusz Specht
2021 Full text SENSORS
To enhance the safety of marine navigation, one needs to consider the involvement of the automatic identification system (AIS), an existing system designed for ship-to-ship and shipto- shore communication. Previous research on the quality of AIS parameters revealed problems that the system experiences with sensor data exchange. In coastal areas, littoral AIS does not meet the expectations of operational continuity and system availability, and there are areas not covered by the system. Therefore, in this study, process models were designed to simulate the tracking of vessel trajectories, enabling system failure detection based on integrity monitoring. Three methods for system integrity monitoring, through hypotheses testing with regard to differences between model output and actual simulated vessel positions, were implemented, i.e., a Global Positioning System (GPS) ship position model, Dead Reckoning and RADAR Extended Kalman Filter (EKF)—Simultaneous localization and mapping (SLAM) based on distance and bearing to navigational aid. The designed process models were validated on simulated AIS dynamic data, i.e., in a simulated experiment in the area of Gda´nsk Bay. The integrity of AIS information was determined using stochastic methods based on Markov chains. The research outcomes confirmed the usefulness of the proposed methods. The results of the research prove the high level (~99%) of integrity of the dynamic information of the AIS system for Dead Reckoning and the GPS process model, while the level of accuracy and integrity of the position varied depending on the distance to the navigation aid for the RADAR EKF-SLAM process model.
Automation of the Road Gate Operations Process at the Container Terminal—A Case Study of DCT Gdańsk SA
- Karol Moszyk
- Mariusz Deja
- Michał Dobrzyński
2021 Full text Sustainability
The future increased terminal capacity will result in more container movement through the road complex and rail siding, which are one of the most critical areas (potential bottlenecks) in the container terminal. Truck turnaround time is one of the major factors that customers take into account while deciding how many container volumes they will handle through the container terminal. To enable to optimize increased traffic with future container terminal development, as well as increase gates throughput, and as a consequence, encourage more volume and increase customer satisfaction, Deepwater Container Terminal Gdańsk SA plans to reorganize and automatize Gate Operation Process. Gate Automation includes supply, installation, commissioning, implementation, and maintenance of software and hardware that would allow automatizing the handling of trucks at container terminal gates by using OCR (Optical Camera Recognition) technology, LPR (License Plate Recognition) systems and self-service kiosk for truck drivers.
AUTOMATYCZNE GENEROWANIE KOLEJNOŚCI LIST UTWORÓW MUZYCZNYCH
- Kamila Pietrusińska
- Adam Kurowski
- Bożena Kostek
2021
W niniejszym rozdziale przedstawiono przygotowanie algorytmu do automa-tycznego układania kolejności utworów muzycznych i zgrywającego je do postaci jednego, długiego miksu. Dzięki algorytmowi dobierane są utwory na podstawie analizy podobieństwa fragmentów końcowych i początkowych utworów. Podo-bieństwo to jest obliczane za pomocą odległości euklidesowej między wektorami parametrów wyznaczonymi przez autoenkoder oraz na podstawie analizy skupień (data clustering). Taki sposób ułożenia utworów umożliwia zapewnienie ciągłości listy. Jakość wyników jest weryfikowana z zastosowaniem testów odsłuchowych przez porównanie automatycznie generowanych list z listami ułożonymi w sposób losowy.
Automatyzacja procesów produkcji spiekanych kompozytów diamentowo-metalowych.
- Andrzej Bakoń
- Adam Barylski
2021 Materiały & Maszyny Technologiczne
Przedstawiono technologie produkcji narzędzi diamentowych o spoiwach metalowych spiekanych. Na podstawie własnych doświadczeń oraz kontaktów z wytwórcami takich narzędzi i firmami oferującymi urządzenia do ich produkcji dokonano przeglądu stosowanych technologii wytwarzania pod katem ich automatyzacji.
Axial capacity of steel built-up battened columns
- Paweł Pieczka
- Piotr Iwicki
2021
This paper deals with the numerical investigation aimed to study the axial capacity of pin-ended steel built-up columns. Three methods of calculating forces in chords and batten, taking into account the material and geometric imperfections specified in the Eurocode 3 are considered. The aim of this study was to compare different methods allowing the calculation of the column load capacity and determine a simpler and faster method than the present Eurocode 3 procedure related to design of built up members. In the paper, the method according to Eurocode 3 for uniform built-up compression member and the method according to PN-B-03200:1990 are compared with the code method for the structure modeled as separate members for column chords and battens. Calculations were carried out for the column modeled by 1D-beam elements and for a whole shell model of the column. Finite element (FE) models were established and verified against the built-up columns with similar configurations that were tested experimentally in the studies presented in the literature, and then compared with the calculations specified in Eurocode 3.
Bacteriophages as potential tools for use in antimicrobial therapy and vaccine development
- Beata Zalewska-Piątek
- Rafał Piątek
2021 Full text Pharmaceuticals
The constantly growing number of people suffering from bacterial, viral, or fungal infections, parasitic diseases, and cancers prompts the search for innovative methods of disease prevention and treatment, especially based on vaccines and targeted therapy. An additional problem is the global threat to humanity resulting from the increasing resistance of bacteria to commonly used antibiotics. Conventional vaccines based on bacteria or viruses are common and are generally effective in preventing and controlling various infectious diseases in humans. However, there are problems with the stability of these vaccines, their transport, targeted delivery, safe use, and side effects. In this context, experimental phage therapy based on viruses replicating in bacterial cells currently offers a chance for a breakthrough in the treatment of bacterial infections. Phages are not infectious and pathogenic to eukaryotic cells and do not cause diseases in human body. Furthermore, bacterial viruses are sufficient immuno-stimulators with potential adjuvant abilities, easy to transport, and store. They can also be produced on a large scale with cost reduction. In recent years, they have also provided an ideal platform for the design and production of phage-based vaccines to induce protective host immune responses. The most promising in this group are phage-displayed vaccines, allowing for the display of immunogenic peptides or proteins on the phage surfaces, or phage DNA vaccines responsible for expression of target genes (encoding protective antigens) incorporated into the phage genome. Phage vaccines inducing the production of specific antibodies may in the future protect us against infectious diseases and constitute an effective immune tool to fight cancer. Moreover, personalized phage therapy can represent the greatest medical achievement that saves lives. This review demonstrates the latest advances and developments in the use of phage vaccines to prevent human infectious diseases; phage-based therapy, including clinical trials; and personalized treatment adapted to the patient’s needs and the type of bacterial infection. It highlights the advantages and disadvantages of experimental phage therapy and, at the same time, indicates its great potential in the treatment of various diseases, especially those resistant to commonly used antibiotics. All the analyses performed look at the rich history and development of phage therapy over the past 100 years.
Badania architektoniczne Twierdzy Wisłoujście w Gdańsku. Etap III: wnętrza Wieńca
- Piotr Samól
- Arkadiusz Woźniakowski
- Robert Hirsch
2021
Badania architektoniczne dotyczyły Wieńca w Twierdzy Wisłoujście. Stanowiły uzupełnienie rozwarstwień Wieńca w zakresie planu budowli.