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Gdańsk University of Technology

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Publications from the year 2019

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  • Residual MobileNets
    • Adam Brzeski
    • Kamil Grinholc
    • Kamil Nowodworski
    • Adam Przybyłek
    2019

    As modern convolutional neural networks become increasingly deeper, they also become slower and require high computational resources beyond the capabilities of many mobile and embedded platforms. To address this challenge, much of the recent research has focused on reducing the model size and computational complexity. In this paper, we propose a novel residual depth-separable convolution block, which is an improvement of the basic building block of MobileNet. We modified the original block by adding an identity shortcut connection (with zero-padding for increasing dimensions) from the input to the output. We demonstrated that the modified architecture with the width multiplier (α) set to 0.92 slightly outperforms the accuracy and inference time of the baseline MobileNet (α = 1) on the challenging Places365 dataset while reducing the number of parameters by 14%.

  • Resonant DC link inverters for AC motor drive systems – critical evaluation
    • Marek Turzyński
    • Piotr Chrzan
    2019 Full text Bulletin of the Polish Academy of Sciences-Technical Sciences

    In this survey paper, resonant and quasiresonant DC link inverters are reexamined for AC motor drive applications. Critical evaluation of representative topologies is based on simulation and waveform analysis to characterize current/voltage stress of components, control timing constraints and feasibility. A special concern over inverter common-mode voltage and voltage gradient du/dt limitation capacity is discussed for motor bearing and winding insulation safety. Experimental records of the laboratory developed parallel quasiresonant DC link inverter feeding induction motor confirm results of analysis. Comparative tables and simulation results demonstrate characteristic features of various schemes.

  • Respiratory signal of bathing person - preliminary study
    • Adam Bujnowski
    • Kamil Osiński
    • Piotr Przystup
    • Jerzy Wtorek
    2019 Full text

    The scope of this paper is analysis of applicability of modern biomedical acquisition system installed in bathtub towards reception of respiratory signals of bathing person. An analysis of the possibility of such measurement is shown as well as preliminary results.

  • Result of the 6-min walk test is an independent prognostic factor of surgically treated non-small-cell lung cancer
    • Tomasz Marjanski
    • Michał Badocha
    • Damian Wnuk
    • Robert Dziedzic
    • Marcin Ostrowski
    • Wioletta Sawicka
    • Witold Rzyman
    2019 Full text Interactive Cardiovascular and Thoracic Surgery

    Pathological tumour, node and metastasis (TNM) stage remains the most significant prognostic factor of non-small-cell lung cancer (NSCLC). Meanwhile, age, gender, pulmonary function tests, the extent of surgical resection and the presence of concomitant diseases are commonly used to complete the prognostic profile of the patient with early stage of NSCLC. The aim of this study is to assess how the result of a 6-min walk test (6MWT) further assists in predicting the prognosis of NSCLC surgical candidates.

  • Retinit im mittleren Geiseltal und in Nordwestsachsen
    • Roland Wimmer
    • Horst Galle
    • Ewa Wagner-Wysiecka
    2019 Full text Mauritiana

    Es werden historische fossile Harzfunde, bekannt unter dem Namen Retinit, aus ehemaligen Braunkohlenvorkommen in Nordwestsachsen und dem Geiseltal beschrieben. Die Harzproben aus dem Geiseltal wurden mittels Infrarotspektrometer untersucht. Der Vergleich der Spektren mit Referenzspektren zeigt, dass es sich bei den „historischen“ Harzproben um ein Harz vom Retinit- Typ, den oxidierten Krantzit (Oxikrantzit), handelt.

  • Review and evaluation of cold recycling with bitumen emulsion and cement for rehabilitation of old pavements
    • Bohdan Dołżycki
    • Piotr Jaskuła
    2019 Full text Journal of Traffic and Transportation Engineering

    The article presents Polish experience with cold recycling of asphalt pavements with theusage of bituminous emulsion and cement. In the 1990s numerous roads in Polandrequired immediate reinforcement due to their significant degradation. Implementation ofthe cold recycling technology was one of the solutions to this problem. Cold recycledmixtures containebeside the recycled asphalt pavement and aggregateetwo differenttypes of binding agents: bituminous emulsion and Portland cement. First Polish re-quirements were developed in the 1990s and were based on the Marshall test. After severalyears of application of these requirements, numerous transverse cracks appeared on thepavements. Field investigation showed that the frequency of transverse cracking was notuniform on all evaluated sections and that the growth rate of the number of cracks wasdecreasing. The main reason of extensive cracking was the overly high amount of thePortland cement and insufficient amount of the bituminous emulsion. This led to pro-duction of very stiff mixtures, with dominance of hydraulic bonds, which behaved simi-larly to cement-treated mixtures. The idea of flexible cold recycled base course was notutilized. This experience motivated the Polish Road Administration to develop new re-quirements. Second part of the article presents the new requirements for cold recycling.New test methods as well as requirements concerning resistance to frost and water actionwere introduced in 2013. Implementing of the new requirements resulted in significantreduction in stiffness of the MCE mixtures. Values of stiffness modulus are even threetimes lower, which should significantly decrease the amount of potential reflective crackson the pavement surface. Presently two types of technology of cold recycling are used in Poland, in-place and in-plant.

  • Review of methods for assessing traffic conditions on basic motorway and expressway sections
    • Aleksandra Romanowska
    • Kazimierz Jamroz
    • Piotr Olszewski
    2019 Full text Archives of Transport

    Motorways and expressways are the core of each country’s road system. Road planning, design and management requires tools to ensure that roads have the right geometry, traffic layout and equipment. These include methods for capacity estimation and assessing traffic conditions. Because the paper focusses on the basic segments of motorways and expressways (sections located between interchanges and outside of their influence), its objective is to review and compare methods used worldwide and establish whether their assumptions or procedures could be used in Polish conditions. Four methods were selected for analysis: US, German, Swedish and Dutch. Theoretical and empirical comparisons were conducted, with the latter using data from sections of motorways and expressways in Poland collected in the RID-2B project. The results of the analyses showed important differences between the methods in terms of procedures for traffic conditions assessment, assumptions, base capacities, traffic conditions measures, factors or speed-flow models. Significant differences were also found when traffic parameter estimates made with particular methods were compared to real data from Polish roads. The results contributed to the development of Poland’s new method, to be prepared as a result of the RID-2B project. It was concluded that none of the analysed methods can be directly adopted to Polish conditions. An important conclusion is the need to include Poland-specific motorway speed limits and procedure for determining free-flow speed, the basis for further analyses.

  • Review of Research into Enterprise Bankruptcy Prediction in Selected Central and Eastern European Countries (prezentacja na konferencji TWENTY-SIXTH ANNUAL CONFERENCE MULTINATIONAL FINANCE SOCIETY)
    • Błażej Prusak
    2019

    Ulotka konferencyjna: http://www.mfsociety.org/modules/modMainContent/uploadFiles/miscFiles/1562848077-MFC2019-Booklet-for-Distribution_2019-06-25.pdf

  • Review of the Complexity of Managing Big Data of the Internet of Things
    • David Gil
    • Magnus Johnsson
    • Higinio Mora
    • Julian Szymański
    2019 Full text COMPLEXITY

    Tere is a growing awareness that the complexity of managing Big Data is one of the main challenges in the developing feld of the Internet of Tings (IoT). Complexity arises from several aspects of the Big Data life cycle, such as gathering data, storing them onto cloud servers, cleaning and integrating the data, a process involving the last advances in ontologies, such as Extensible Markup Language (XML) and Resource Description Framework (RDF), and the application of machine learning methods to carry out classifcations, predictions, and visualizations. In this review, the state of the art of all the aforementioned aspects of Big Data in the context of the Internet of Tings is exposed. Te most novel technologies in machine learning, deep learning, and data mining on Big Data are discussed as well. Finally, we also point the reader to the state-of-the-art literature for further in-depth studies, and we present the major trends for the future.

  • REVIEW OF WEATHER FORECAST SERVICES FOR SHIP ROUTING PURPOSES
    • Marcin Życzkowski
    • Joanna Szłapczyńska
    • Rafał Szłapczyński
    2019 Full text Polish Maritime Research

    Weather data is nowadays used in a variety of navigational and ocean engineering research problems: from the obvious ones like voyage planning and routing of sea-going vessels, through the analysis of stability-related phenomena, to detailed modelling of ships’ manoeuvrability for collision avoidance purposes. Apart from that, weather forecasts are essential for passenger cruises and fishing vessels that want to avoid the risk associated with severe hydro-meteorological conditions. Currently, there is a wide array of services that offer weather predictions. These services include the original sources – services that make use of their own infrastructure and research models – as well as those that further post-process the data obtained from the original sources. The existing services also differ in their update frequency, area coverage, geographical resolution, natural phenomena taken into account and finally – output file formats. In the course of the ROUTING project, primarily addressing ship weather routing accounting for changeable weather conditions, the necessity arose to prepare a report on the state-of-the-art in numerical weather prediction (NWP) modelling. Based on the report, this paper offers a thorough review of the existing weather services and detailed information on how to access the data offered by these services. While this review has been done with transoceanic ship routing in mind, hopefully it will also be useful for a number of other applications, including the already mentioned collision avoidance solutions.

  • Review on Wikification methods
    • Julian Szymański
    • Maciej Naruszewicz
    2019 AI COMMUNICATIONS

    The paper reviews methods on automatic annotation of texts with Wikipedia entries. The process, called Wikification aims at building references between concepts identified in the text and Wikipedia articles. Wikification finds many applications, especially in text representation, where it enables one to capture the semantic similarity of the documents. Also, it can be considered as automatic tagging of the text. We describe typical approaches to Wikification, and identify their advantages and disadvantages. The main problem for wide usage of the Wikification method is the lack of open-sourced frameworks that enable researchers to work cooperatively on that problem. Also problematic is the lack of a unified platform for evaluation of the results proposed by different approaches.

  • Rewitalizacja historycznego zespołu pałacowo-parkowego w Lokalnym Programie Rewitalizacji Wejherowa (2008-2015). Revitalisation of the Historic Palace and Park in the Local Revitalisation Program of Wejherowo (2008-2015)
    • Anita Jaśkiewicz-Sojak
    • Maria Sołtysik
    2019 Studia Komitetu Przestrzennego Zagospodarowania Kraju PAN

    W latach 1990. po upadku komunizmu w Polsce, przestrzeń publiczna w Wejherowie - podobnie jak i w innych miastach Polski była w dużym stopniu zdegradowana. W 2008 roku władze miasta Wejherowa opracowały i zatwierdziły "lokalny program rewitalizacji na lata 2008-2015", który dotyczył głównie centrum miasta. Miał on być w dużym stopniu finansowany przez Unię Europejską..Jedną z najbardziej eksponowanych przestrzeni publicznych, które miały zostać zrewitalizowane był historyczny pałac i park, usytuowany wzdłuż brzegów rzeki Cedron, w pobliżu głównego placu miejskiego. . Program ten został z powodzeniem zrealizowany do 2015 roku i jest obecnie kontynuowany w następnym zadaniu rewitalizacyjnym na lata 2015-2022.

  • Rewitalizacja zespołow fortyfikacji nowożytnych - ograniczenia i możliwości
    • Grzegorz Bukal
    2019 Studia Komitetu Przestrzennego Zagospodarowania Kraju PAN

    Fortyfikacjenowożytne stanowią w Polsce liczną grupę zabytków, trudną do utrzymywania i zarządzania co powoduję ich postępującą degradację. Wskutek zmian polityczno-ekonomicznych w ostatnich dekadach, powstał problem chaotycznych i agresywnych działań inwestycyjnych, zagrażających zabytkowym fortyfikacjom. Tekst omawia fortyfikacje jako część dziedzictwa kulturowego, sprzecznośći pomiędzy pojęciami "rewitalizacji" i "rewaloryzacji" oraz pokazuje perspektywy wspołczesnego funkcjonowania fortyfikacji nowożytnych.

  • Rewitalizujaca rola sztuki w miejskiej przestrzni publicznej
    • Dorota Wojtowicz-Jankowska
    2019 Full text Kwartalnik Naukowy Uczelni Vistula

    Współcześnie sztuka stała się narzędziem rewitalizującym miejskie przestrzenie publiczne. Obserwacja przemian jakie dokonują się w miastach dzięki jej obecności powoduje, że dostrzegany jest w niej nie tylko element estetyzujący, ale także naprawczy. Następuje wykorzystywanie działań twórczych do pobudzania aktywności lokalnych społeczności. Zauważalne włączanie mieszkańców do działań partycypacyjnych z udziałem sztuki powoduje, że nie jest oceniana tylko jako przedmiot obserwacji, ale także jako obiekt generujący nowe zachowania czy nawet postawy społeczne. Świadomość jak sztuka odmienia przestrzeń publiczną miasta jest ważnym środkiem w kształtowaniu polityki rewitalizacyjnej miast.

  • Rewizja przybliżonej metody szacowania oporu całkowitego kadłuba płynącego w przechyle
    • Artur Karczewski
    • Katarzyna Malinowska
    • Hanna Pruszko
    2019 Full text Mechanik

    Na tle innych obiektów pływających jacht żaglowy wyróżnia się m.in. tym, że choć jest zaprojektowany jako pojazd poruszający się w pozycji wyprostowanej, to jednak znaczną część czasu żegluje w przechyle. Dlatego tak ważne jest poznanie zachodzących wtedy zjawisk, zwłaszcza związanych z oporem hydrodynamicznym. W artykule zaprezentowano porównanie oparte na weryfikacji wybranej, przybliżonej metody oszacowania zmian oporu całkowitego gołego kadłuba w wyniku jego przechylania się, polegającej na sprawdzeniu wykonanym metodą numeryczną (CFD) i eksperymentalną (przez badania modelowe). Obliczenia uproszczone oparto na metodach opracowanych w ramach serii Delft (The Delft Systematic Yacht Hull Series, DSYHS). W artykule przedstawiono wyniki oszacowań dla wybranego jachtu żaglowego.

  • Rigid finite elements and multibody modeling in analyses of a robot shaped elastic/plastic deformations of a beam
    • Krzysztof Lipiński
    • Krzysztof Bobrowski
    • Edmund Wittbrodt
    2019

    Dynamics analysis of a system composed of a parallel manipulator and of an elastic beam is presented in the paper. Classic 3RRR parallel manipulator is considered and used to deform the beam. Elasto-plastic deformations are investigated. Rigid-finite-elements technique is employed to deal with dynamics of the beam. A multibody structure is associated with the introduced hybrid system in order to model its dynamics. Idea of the corresponding numerical model is presented. Then numerical tests are performed in order to observe behaviour of the tested system. The tests have validated that the parallel manipulator can be successfully used for plastic deformations of beams in order to form them into the industry required shapes. The tests proved that resistances of the beam deformations are the dominant loads for such application. Influence of the platform dynamics is of the secondary order. Longitudinal slip at the platform’s gripper is significant during such processes and should not be locked.

  • Risk of Cost Overruns in Implementation of Building Investment in Urban Conditions in the Aspect of Historical Background of its Location
    • Magdalena Apollo
    • Beata Grzyl
    • Jakubowicz Paweł
    2019 Full text IOP Conference Series: Materials Science and Engineering

    The article is a continuation of the authors' analyzes on the risk of delays in implementation of building investment in urban conditions in the aspect of historical background of its location. In case of construction investment located in the historic part of the city, the possible accumulation of many unfavourable factors, which in course of its implementation, may constitute a serious source of cost overruns and disruptions, should be taken into account at the preparation stage of the project. Therefore the aim of the article is to present the main factors that have a significant impact on the construction site located in the historic part of the city, i.e. they are the cause of risk in the course of works and, as a consequence, affect the cost of construction project. On the selected example of the facility located in the historic part of Gdańsk Old Town, the authors indicate the reasons for construction investment cost increase. The authors also analyze the scope of resulting cost overruns between planned and actual values. The aim of the analysis is to draw investors' attention to the need of taking into account cost contingency already at the preparation stage of construction investment, which results from the specific and unique nature of this type of projects.

  • Risk of Delays in Implementation of Building Investment in Urban Conditions in the Aspect of Historical Background of its Location
    • Magdalena Apollo
    • Beata Grzyl
    • Jakubowicz Paweł
    2019 Full text IOP Conference Series: Materials Science and Engineering

    The implementation of a construction investment in urban conditions is extremely complex, and at the same time exposed to a high risk of a specific character. In case of construction investment located in the historic part of the city, the possible accumulation of many unfavourable factors, which in course of its implementation, may constitute a serious source of delays and disruptions, should be taken into account at the preparation stage of the project. Therefore, the aim of the article is to present the main factors that have a significant impact on the construction site located in the historic part of the city, i.e. they are the cause of risk in the course of works and, as a consequence, affect the time of investment implementation. On the selected example of the facility located in the historic part of Gdańsk Old Town, the authors indicate the reasons for construction investment duration time extension. The authors also analyze the scope of resulting time delays between planned and actual values. The aim of the analysis is to draw investors' attention to the need of taking into account time contingency already at the preparation stage of construction investment, which results from the specific and unique nature of this type of projects. The article is a continuation of the authors' analyzes on the risk of cost overruns in implementation of building investment in urban conditions in the aspect of historical background of its location.

  • Risks to Older People in Road Traffic
    • Marcin Budzyński
    • Agnieszka Tubis
    2019 Full text IOP Conference Series: Materials Science and Engineering

    he article looks at road traffic risks and main trends from the perspective of older road users (drivers, cyclists, pedestrians). With a longer time to react, poor eyesight and hearing, impaired mobility, ill health and medication, older road users are put at risk. A comprehensive and pro-active strategy is needed to deal with these risk factors and meet the safety and mobility needs of older people in the (nearest) future. The strategy should focus on assessing the main trends and identifying the road traffic risks for older road users. It should also aim to implement treatments such as ITS and change how road infrastructure is designed today.The objective of the work is to identify the risks to older people in road traffic and develop recommendations on ways to improve the safety of this age group. A study of the literature helpedto identify the risk factors faced by older road users. Statistical analyses were used to define the trends, causes and circumstances of accidents involving this age group in the EU and in Poland compared to the EU. The article identifies risks and classifies them for older drivers, pedestrians and cyclists. Needs for universal road infrastructure design are identified (to ensure full accessibility for all age groups, including older people and people with disabilities) and ITS treatments are formulated.EU data shows that about 44% of all pedestrian fatalities are people aged 65 and older. This highlights the seriousness of the problem. With an increasing share of this age group in society and a lack of road treatments to improve the situation, the statistics may deteriorate even further. In Poland drivers aged 65 and older have caused 10% of all accidents involving 14% of all fatalities.

  • RMS-based damage detection in reinforced concrete beams: numerical simulations
    • Beata Zima
    • Rafał Kędra
    2019 Full text Diagnostyka

    Image-based damage detection methods using guided waves are well known and widely applied approaches in structural diagnostics. They are usually utilized in detection of surface damages or defects of plate-like structures. The article presents results of the study of applicability of imaging wave-based methods in detection in miniscule internal damage in the form of debonding. The investigations were carried out on numerical models of reinforced concrete beams with varying size of circumferentially oriented debonding between steel rod and concrete block. Maps created using root mean square of measured signals are presented. Moreover, the results were collected for two different excitation frequencies.