2018 - Repozytorium publikacji - Politechnika Gdańska

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Akustyczna analiza parametrów ruchu drogowego z wykorzystaniem informacji o hałasie oraz uczenia maszynowego
- Karolina Marciniuk
2018 Pełny tekst
Celem rozprawy było opracowanie akustycznej metody analizy parametrów ruchu drogowego. Zasada działania akustycznej analizy ruchu drogowego zapewnia pasywną metodę monitorowania natężenia ruchu. W pracy przedstawiono wybrane metody uczenia maszynowego w kontekście analizy dźwięku (ang.Machine Hearing). Przedstawiono metodologię klasyfikacji zdarzeń w ruchu drogowym z wykorzystaniem uczenia maszynowego. Przybliżono podstawowe zagadnienia z dziedziny Inżynierii Ruchu Drogowego, skupiając się na parametrach oceny strumienia ruchu i ich metodach pomiaru w kontekście dynamicznego zarządzania ruchem. W celu realizacji badań zarejestrowano sesje nagrań fonicznych w różnych warunkach pogodowych i w różnych porach roku. W przeprowadzonych badaniach, na podstawie rejestrowanych poziomów hałasu, wyznaczano liczbę pojazdów, czasy zdarzenia i zajętości przekroju drogi w dziedzinie czasu. Na podstawie zebranych danych dokonywano statystyk dla zadanych przedziałów czasu. Klasyfikacja aktywnych ramek sygnału, pozwala na rozpoznawanie typu pojazdu i warunków meteorologicznych panujących na drodze. Przebadano skuteczność działania wybranych algorytmów, w tym uczenia głębokiego w zestawieniu z komercyjnymi urządzeniami wykorzystywanymi w ocenie ruchu drogowego, uzyskując zbliżone skuteczności. Uzyskane wyniki wskazują na możliwość wykorzystania zaproponowanej metodologii w praktycznych rozwiązaniach nadzoru ruchu drogowego.
Algorytm i program sterowania układem samoczynnego załączania rezerwy zasilania z funkcją odciążania
- Ireneusz Mosoń
- Mateusz Korneluk
2018 Pełny tekst Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
W artykule omówiono układ samoczynnego załączania rezerwy (SZR) zasilania z jednym transformatorem i jednym generatorem przy rezerwie jawnej, z ośmioma grupami odbiorów i funkcją odciążania. W systemie sterowania tego układu SZR założono wykorzystanie sterownika programowalnego, graficznego dotykowego panelu operatorskiego i analizatorów parametrów sieci. Funkcja odciążania służy do realizacji przełączania wyłączników grup odbiorów w celu zabezpieczenia przed przeciążeniem generatora w przypadku przełączenia układu na zasilanie rezerwowe. Przełączeń dokonuje się po uwzględnieniu mocy generatora i aktualnej, sumarycznej mocy odbiorów, oraz zadanych priorytetów zasilania poszczególnych grup odbiorów. W artykule przedstawiono algorytm główny programu oraz algorytm funkcji odciążania, omówiono program sterowania oraz wizualizację. Program sterowania i wizualizację opracowano w oprogramowaniu narzędziowym easy Soft CoDeSys ver.2.3.5. Przejrzystą strukturę programu sterowania osiągnięto dzięki opracowaniu i zastosowaniu w programie głównym wielu bloków funkcyjnych użytkownika. Testy potwierdzające poprawność opracowanego oprogramowania i wizualizacji przeprowadzono na wirtualnym sterowniku programowalnym.
Algorytmy wykrywania krawędzi w obrazie
- Paweł Kowalski
- Maciej Czyżak
2018 Pełny tekst Poznan University of Technology Academic Journals. Electrical Engineering
Wykrywanie krawędzi jest pierwszym etapem w cyfrowym przetwarzaniu obrazów. Operacja ta polega na usunięciu informacji takich jak kolor czy też jasność, a pozostawieniu jedynie krawędzi. Efektem tej operacji jest znaczna redukcja ilości danych do dalszej analizy. Pozwala to na zastosowanie w następnych etapach bardziej złożonych algorytmów rozpoznawania obiektów na podstawie kształtu. W artykule zaprezentowano zastosowanie algorytmów Robertsa, Sobela, Previtta, Kirscha i Scharra. Zaproponowano też nowy, efektywny obliczeniowo, algorytm dedykowany do wykrywania krawędzi poziomych. Algorytmy zostały porównane w zastosowaniu do detekcji przewodów. Kryteriami porównania były skuteczność wykrywania krawędzi przewodów wysokiego napięcia oraz szybkość działania. Algorytmy zostały zaimplementowane z wykorzystaniem biblioteki OpenCV oraz przetestowane na zestawie zdjęć przedstawiających przewody wysokiego napięcia.
Algorytmy wyodrębniania składowych symetrycznych sygnału pomiarowego napięcia w przypadku asymetrii sieci trójfazowej
- Krzysztof Blecharz
2018 Pełny tekst Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
W artykule zaprezentowano działanie wybranych algorytmów wykorzystywanych do wyodrębniania składowych symetrycznych z sygnałów pomiarowych napięcia lub prądu w przypadku wystąpienia asymetrii trójfazowej sieci elektroenergetycznej. Weryfikacji działania algorytmów dokonano na podstawie badań symulacyjnych i laboratoryjnych w układzie w którym jako odbiornik zastosowano stojan maszyny asynchronicznej pierścieniowej. Określono wpływ szumów pomiarowych oraz asymetrii wewnętrznej odbiornika na działanie algorytmów.
All solid state electrodes taste sensor with modified polymer membranes for discrimination of mineral water with different CO2 content
- Ewa Marjańska
- Maria Szpakowska
2018 Desalination and Water Treatment
A potentiometric taste sensor with All Solid State Electrodes containing five all solid state electrodes with appropriate lipophilic compounds (benzyldimethyltetradecylammonium chloride, dodecyltrimethylammonium bromide, palmitic acid, stearic acid, and phytol) embedded in a polymer membrane was applied for discrimination of mineral water samples differed in CO2 content. Samples of still, slightly sparkling, and sparkling Naleczowianka mineral water were examined. The investigation of CO2 content in the sparkling Naleczowianka mineral water in time lapse after opening the bottle was also performed. It was shown by Principal Component Analysis and Agglomerative Hierarchical Clustering that the taste sensor could discriminate between samples of similar CO2 content. Distances between principal component points representing samples of tested water as a function of time after opening the bottle created a power curve. These distances could be a measure of CO2 content in tested water samples. The shape of the obtained power curve was in agreement with sensory perception of major CO2 release during openings of the bottle of carbonated water
Alternative cogeneration thermodynamic cycles for domestic ORC
- Dariusz Mikielewicz
- Jan Wajs
- Jarosław Mikielewicz
2018 Pełny tekst Chemical and Process Engineering : New Frontiers
The Organic Flash Cycle (OFC) is suggested as a vapor power cycle that could potentially improve the efficiency of utilization of the heat source. Low and medium temperature finite thermal sources are considered in the cycle. Additionally the OFC’s aim is to reduce temperature difference during heat addition. The study examines 2 different fluids. Comparisons are drawn between the OFC and an optimized basic Organic Rankine Cycle (ORC). Preliminary results show that ethanol and water are better suited for the ORC and OFC due to higher power output. Results also show that the single flash OFC achieves better efficiencies than the optimized basic ORC. Although the OFC improves the heat addition exergetic efficiency, this advantage was negated by irreversibility introduced during flash evaporation.
AMCA to TAMRA long range resonance energy transfer on a flexible peptide
- Anna Synak
- R. Fudala
- Ignacy Gryczynski
- Leszek Kułak
- S Shah
- Illia E. Serdiuk
- Beata Grobelna
- P Arłukowicz
- Aleksander Kubicki
- Piotr Bojarski
2018 DYES AND PIGMENTS
Förster resonance energy transfer between 7-amino-4-methyl-3-coumarinylacetic acid, (AMCA, donor) and 5- carboxytetramethylrhodamine, (TAMRA, acceptor) bound to Lys(AMCA)-Gly-Pro-Arg-Ser-Leu-Ser-Gly-Lys (TAMRA)-NH2 peptide is demonstrated by various spectroscopic techniques in glycerol at room temperature. In particular, nonexponential character of fluorescence intensity decay evidences the distance distribution between the donor and acceptor sites resulting from the flexibility of the peptide. Numerical analysis of the fluorescence decay yields the distance distribution parameters. The results obtained are consistent with those obtained from steady-state fluorescence indicating that energy transfer is more efficient than suggested by the relation between the critical distance and donor-acceptor distance for elongated peptide conformation.
Aminy w środowisku - niebezpieczeństwo czy jego naturalny element?
- Joanna Potapowicz
- Małgorzata Szopińska
- Żaneta Polkowska
2018 Analityka: Nauka i Praktyka
A lot of amines and their compounds are used in the industry. First of all they are used for the preparation of medicines, plant protection agents, fertilizers and plastics. Amines are also released into the environment as a result of natural biological processes such as the release of certain species of flowers to lure insects, and also biochemical breakdown of amino acids in the protein during decomposition of organic matter. Unfortunately, most amines are endangering the environment and consequently human health. Many amines and their compounds have carcinogenic, embryotoxic, mutagenic properties. They inhibit growth of aquatic organisms. Amines have a specific chemical properties e.g. high volatility, decomposition under the action of high temperatures. Concentration of amines in the environment can be determined by the use of appropriately selected analytical methods. Therefore amines in the environment are most often identified by gas, liquid and ion chromatography.
Ampacity of power cables exposed to solar radiation – recommendations of standards vs. CFD simulations
- Stanisław Czapp
- Marian Czapp
- Seweryn Szultka
- Adam Tomaszewski
2018 Pełny tekst E3S Web of Conferences
The aim of the paper is to evaluate the ampacity of a low-voltage single power cable according to: 1) recommendations of the standard IEC 60287, 2) a Computational Fluid Dynamics method, implemented in Ansys software; and comparison of the results obtained for these two cases. Moreover, limitations of recommendations of the above mentioned standard are indicated.
AMUNICJA I JEJ ELABORACJA PRAKTYCZNY PORADNIK NOWE WYDANIE
- Jerzy Ejsmont
2018
W książce omówiona jest budowa amunicji strzeleckiej, ze szczególnym uwzględnieniem wpływu konstrukcji pocisku na osiągi amunicji. Omówione jest szczegółowo wyposażenie niezbędne do domowej elaboracji amunicji pistoletowej i karabinowej. Przedstawiono zasady doboru komponentów takich jak proch, pociski i spłonki oraz techniki wykonywania poszczególnych czynności związanych z przygotowaniem łusek, doborem typu i ilości prochu jak również montażem amunicji. Szczególnie dużo uwagi poświęcono zagadnieniom bezpieczeństwa. W stosunku do pierwszego wydania, bieżące wydanie poszerzone zostało o opis nowych urządzeń do elaboracji i omówienie zasad elaboracji amunicji dużego kalibru (.408 CheyTac i .50BMG). Książka przeznaczona jest dla osób samodzielnie elaborujących amunicję oraz słuchaczy szkół wojskowych i policyjnych.
An Algorithm for Optimizing the Determination of Cycling Routes on the Example of the Gdansk Agglomeration
- Adam Inglot
- Artur Janowski
- Krystian Koziol
2018
Physical activity is an essential part of a healthy lifestyle. One of the manifestations of the change in a society type from consumer to information one is the understanding of the importance of ecology and a healthy lifestyle. This is evident, inter alia, in the inventiveness and involvement of the society in the start-up and solutions referred to as the Smart City. One example is the development of e-bike rental and local investments in the development of the bicycle network. The selection of optimal locations for renting equipment in network equipment rentals can be difficult without research based on real measurements. The following article presents the preliminary concept of urban space analysis in terms of its use in bicycle transport. Gdansk agglomeration was chosen as the research area.
An algorithm to generate high dense packing of particles with various shapes
- Konrad Miśkiewicz
- Robert Banasiak
- Maciej Niedostatkiewicz
- Krzysztof Grudzień
- Laurent Babout
2018 Pełny tekst MATEC Web of Conferences
Discrete Element Method (DEM) is one of available numerical methods to compute movement of particles in large scale simulations. The method has been frequently applied to simulate the cases of grain or bulk material as the major research issue. The paper describes a new method of generating high dense packing with mixed material of two different shape used in DEM simulation. The initial packing is an important parameter to control, because have influence on the first few seconds after start the simulation. Some-times when the material in silo is arranged with loose packing before the start, the particles move downward gravity. These changes between the start and the first few seconds in simulations act strongly on the results at the end of a discharging process in silo. At the initial simulation time it is important to prepare proper packing with mixed material, in order to make sure that the particles will not move due to gravity action. This solution is a necessary step to integrate in the simulation procedure in order to compare later the computer simulation with experimental measurements of material discharge in a silo.
An Analysis of Cylindrical Posts of Arbitrary Convex Cross Sections Located in Waveguide Junctions with the Use of Field Matching Method
- Maciej Jasiński
- Sebastian Dziedziewicz
- Piotr Kruczyński
- Rafał Lech
- Piotr Kowalczyk
2018 Pełny tekst
A problem of electromagnetic wave scattering from cylindrical posts of arbitrary cross section located in waveguide junction is presented. The method of analysis is based on the direct ﬁeld matching technique. Multimode scattering matrices of every section of waveguide junction are calculated and cascading procedure is utilized to investigate the whole structure. The results are veriﬁed by comparing them with those obtained from the mode matching method analysis as well as commercial software calculations.
An Analysis of Periodic Arrangements of Cylindrical Objects of Arbitrary Convex Cross Sections with the Use of Field Matching Method
- Małgorzata Warecka
- Rafał Lech
- Piotr Kowalczyk
2018 Pełny tekst
A problem of electromagnetic wave scattering from multilayered frequency selective surfaces is presented. Each surface is composed of periodically arranged cylindrical posts of arbitrary convex cross-section. The method of analysis is based on the direct ﬁeld matching technique for a single cell, and the transmission matrix method with the lattice sums technique for periodic arrangement of scatterers.
An Analysis of Scattering from Ferrite Post of Arbitrary Convex Cross Section with the Use of Field Matching Method
- Michał Pastwa
- Tymoteusz Olszewski
- Rafał Lech
- Piotr Kowalczyk
- Jerzy Mazur
2018 Pełny tekst
A problem of electromagnetic wave scattering from ferrite post is presented. The post is assumed to be located in closed areas as waveguide junction, or in open area illuminated by a plane wave. The object is of arbitrary convex cross section and the method of analysis is semi-analytical, based on the direct ﬁeld matching technique.
An analytical hierarchy process for selection of the optimal procedure for resveratrol determination in wine samples
- Magdalena Fabjanowicz
- Marta Bystrzanowska
- Jacek Namieśnik
- Marek Tobiszewski
- Justyna Płotka-Wasylka
2018 Pełny tekst MICROCHEMICAL JOURNAL
The study shows the application of analytical hierarchy process (AHP) in ranking the analytical procedures, that are applied for resveratrol determination in wine samples. 19 different analytical methodologies are described by metrological, economic and environmental criteria, that are further divided into 10 subcriteria. Before AHP application, the amount of input data is decreased with cluster analysis. The first run of AHP is aimed to rank the clustered analytical procedures, while the second analysis is performed to select the best procedure from the cluster with the highest rank obtained in the first AHP run. The procedure based on a direct sample injection to high performance liquid chromatography with UV detection is the most beneficial one. AHP is excellent tool for the assessment and the selection of the most appropriate analytical procedure from several available. The choice of MCDA method is dictated by the fact, that so far, no examples of the usage of a given method for the selection of the optimal analytical procedure have been found in the literature.
An application of acoustic sensors for the monitoring of road traffic
- Karolina Marciniuk
- Maciej Szczodrak
- Andrzej Czyżewski
2018
Assessment of road traffic parameters for the developed intelligent speed limit setting decision system constitutes the subject addressed in the paper. Current traffic conditions providing vital data source for the calculation of the locally fitted speed limits are assessed employing an economical embedded platform placed at the roadside. The use of the developed platform employing a low-powered processing unit with a set of microphones, an accelerometer and some other sensors, for the estimation of the essential road traffic parameters is presented in the paper. Acoustical signal processing-based vehicle counting attempts were made, and an acceleration sensor was used in order to detect the heavy vehicles pass-bys. Obtained results based on the measurements were discussed in the paper. Evaluation of the proposed methods is provided.
An assessment of health status and health behaviours in adolescents: main points and methods of the SOPKARD-Junior programme.
- Klaudia Suligowska
- Piotr Czarniak
- Michał Krawczyk
- Przemysław Szcześniak
- Ewa Król
- Aida Kusiak
- Robert Sabiniewicz
- Tomasz Wierzba
- Alicja Utracka
- Magdalena Urban
- Anna Wytrykowska
- Anna Pakalska
- Konrad Drewek
- Anna Giczewska
- Piotr Popowski
- Magdalena Wrotkowska
- Joanna Marczulin
- Mariusz Bochniak
- Tomasz Zdrojewski
2018 Pełny tekst Archives of Medical Science
The study involved preparing and implementing a model of screening assessments for adolescents and comparison of anthropometric examinations between the population of the SOPKARD-Junior programme and representative sample of Polish children in the same years.Additionally, data concerning attendance rates for particular examinations carried out under SOPKARD-Junior programme were presented.Revier2,comment 1
An attempt to mechanistically explain the viscoelastic behavior of transparent epoxy/starch-modified ZnO nanocomposite coatings
- Morteza Ganjaee
- Henri Vahabi
- Xavier Gabrion
- Pascal Laheurte
- Payam Zarrintaj
- Krzysztof Formela
- Mohammad Saeb
2018 PROGRESS IN ORGANIC COATINGS
The effects of bare and starch-modified ZnO (ZnO-St) nanoparticles on viscoelastic and mechanical properties are studied by dynamic mechanical and tensile analyses. Transparent epoxy-based nanocomposite films are prepared by incorporating bare or starch-modified ZnO particles into the epoxy matrix. The results demonstrated that ZnO particles hindered the curing reactions and hence the final properties of the cured epoxy. As a result, glass-transition temperature (Tg) and crosslinking density demoted. However, starch as a surface modifier compensated for the undesired effects of ZnO in a way that by enhancing the curing reactions through autocatalytic mechanism, Tg and crosslinking density increased. The storage moduli for epoxy, epoxy/ZnO and epoxy/ZnO-St are accordingly as 13.84, 3.95 and 19.54 MPa. Therefore, the molecular weight between the entanglements is calculated as 0.2878, 1.0089 and 0.2039 in the same order. Moreover, considering the peaks of the tanδ diagrams, Tgs for epoxy, epoxy/ZnO and epoxy/ZnO-St are obtained as 95.95, 100.16 and 101.24 °C, respectively. Comparing epoxy/ZnO-St nanocomposite to epoxy, it can be inferred that the network becomes tougher in the elastic region and then becomes softer passing this region. Mechanistic sketches of epoxy network formation in the presence of bare and surface-treated nanoparticles are discussed.
An empirical study on the impact of AspectJ on software evolvability
- Adam Przybyłek
2018 Pełny tekst EMPIRICAL SOFTWARE ENGINEERING
Since its inception in 1996, aspect-oriented programming (AOP) has been believed to reduce the effort required to maintain software systems by replacing cross-cutting code with aspects. However, little convincing empirical evidence exists to support this claim, while several studies suggest that AOP brings new obstacles to maintainability. This paper discusses two experiments conducted to evaluate the impact of AspectJ (the most mature and popular aspect-oriented programming language) versus Java on software evolvability. We consider evolvability as the ease with which a software system can be updated to fulfill new requirements. Since a minor language was compared to the mainstream, the experiments were designed so as to anticipate that the participants were much more experienced in one of the treatments. The first experiment was performed on 35 student subjects who were asked to comprehend either Java or AspectJ implementation of the same system, and perform the corresponding comprehension tasks. Participants of both groups achieved a high rate of correct answers without a statistically significant difference between the groups. Nevertheless, the Java group significantly outperformed the AspectJ group with respect to the average completion time. In the second experiment, 24 student subjects were asked to implement (in a non-invasive way) two extension scenarios to the system that they had already known. Each subject evolved either the Java version using Java or the AspectJ version using AspectJ. We found out that a typical AspectJ programmer needs significantly fewer atomic changes to implement the change scenarios than a typical Java programmer, but we did not observe a significant difference in completion time. The overall result indicates that AspectJ has a different effect on two sub-characteristics of the evolvability: understandability and changeability. While AspectJ decreases the former, it improves one aspect of the latter.