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Gdańsk University of Technology

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Publications from the year 2018

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  • Terpeny w powietrzu wewnętrznym cz. I. Ich rola i znaczenie w kształtowaniu jakości powietrza wewnętrznego
    • Klaudia Pytel
    • Renata Marcinkowska
    • Bożena Zabiegała
    2018 Analityka: Nauka i Praktyka

    Potencjał terpenów do tworzenia cząstek wtórnego aerozolu organicznego (SOA) został po raz pierwszy opisany już w 1960 roku. Od tamtego czasu naukowcy poświęcili dużo uwagi tej tematyce. Dzięki temu wiedza na temat powstawania i wpływu SOA na organizmy żywe, a także rozumienie procesów odpowiedzialnych za jego powstawanie znacząco wzrosły.

  • TESTING CONTRACTION AND THERMAL EXPANSION COEFFICIENT OF CONSTRUCTION AND MOULDING POLYMER COMPOSITES
    • Łukasz Pyrzowski
    2018 Full text Polish Maritime Research

    The paper presents results of systematic tests of contraction and thermal expansion coefficients of materials based on polymer composites. The information on the above material properties is essential both at the design stage and during the use of finished products. Components for the samples were selected in such a way as to represent typical materials used for production of construction and moulding elements. The performed tests made it possible to monitor the analysed parameters at different stages of the technological process.

  • Testing Question Order Effects of Self-perception of Risk Propensity on Simple Lottery Choices as Measures of the Actual Risk Propensity
    • Jakub Golik
    2018 Full text ASK: RESEARCH & METHODS

    Uncertainty together with the necessity of making choices inevitably results in risky decisions. For many years now, scientists have been studying notions connected with risk such as risk management, risk perception or risk propensity. While many sophisticated methods regarding measurement of risk propensity have been developed so far, it seems that little attention has been paid to checking whether they are not inherently flawed. The main goal of this article is to check with a simple preliminary study whether questionnaire based methods of risk propensity assessment are not susceptible to question order effects. The research is focused on respondents’ answers to simple lottery choices as measures of their risk propensity. However, what would happen if the respondents were first asked how they perceive their own risk propensity? In order to answer this query a few questions designed to measure risk propensity and self-perception of risk propensity have been interspersed in a questionnaire of another research project. Furthermore, as an additional output of the study, the correlation has been checked between self-perception of risk propensity and the actual assessment of risk propensity based on the questions used. The results of the study show that question order effects are partially present in the setting described. Some conclusions and recommendations for further research are made based on the results. Finally, it can be concluded from the research that simple self-perception of risk propensity was significantly correlated with measures of actual risk propensity used.

  • Testing Students’ Entrepreneurial Self-Efficacy as an Early Predictor of Entrepreneurial Activities. Evidence From the SEAS Project
    • Krzysztof Zięba
    • Jakub Golik
    2018 Full text Journal of Entrepreneurship, Management and Innovation

    Over the last forty years, since Bandura (1977) introduced the concept of self-efficacy, there have been a constantly growing number of research publications using this concept. Its early development resulted in the creation of a new construct of entrepreneurial self-efficacy (ESE) proposed for the first time by (Chen et al. 1998). Since then, many different groups of research concerning ESE have emerged - one of them is the study of ESE of students. With regard to this particular group, a recent tendency to study ESE in a pre-post setting can be noticed i.a. Karlsson, Moberg (2013), Shinnar, Hsu, Powell (2014), Ismail, Zain, Zulihar (2015). Due to the increasing interest in entrepreneurial self-efficacy research and the need to fill the gap in the literature with regard to European post-communist countries (and particularly – Poland) (Drnovsek, Wincent, Cardon, 2010), in this paper we present a brief overview of ESE research and pose the question whether ESE of Polish students can serve as an early predictor of their subsequent entrepreneurial activities, potentially leading them to nascent entrepreneurship. The research material was collected from the SEAS (Survey on Entrepreneurial Attitudes of Students) Project carried out at the Faculty of Management and Economics, Gdańsk University of Technology. The research sample was composed of 72 students - ESE was measured in a pre-post setting using a single item based on a five-point Likert scale. One of the research conclusions is that ESE manifested by student-beginners seems to influence their later entrepreneurial behavior in a statistically significant way - potentially making ESE a valuable early predictor of future entrepreneurial activities. In the concluding part of the study, limitations are discussed and future study developments are indicated.

  • Text Categorization Improvement via User Interaction
    • Jakub Atroszko
    • Julian Szymański
    • David Gil
    • Higinio Mora
    2018

    In this paper, we propose an approach to improvement of text categorization using interaction with the user. The quality of categorization has been defined in terms of a distribution of objects related to the classes and projected on the self-organizing maps. For the experiments, we use the articles and categories from the subset of Simple Wikipedia. We test three different approaches for text representation. As a baseline we use Bag-of-Words with weighting based on Term Frequency-Inverse Document Frequency that has been used for evaluation of neural representations of words and documents: Word2Vec and Paragraph Vector. In the representation, we identify subsets of features that are the most useful for differentiating classes. They have been presented to the user, and his or her selection allow increase the coherence of the articles that belong to the same category and thus are close on the SOM.

  • Text Mining Algorithms for Extracting Brand Knowledge; The fashion Industry Case
    • Nina Rizun
    • Wioleta Kucharska
    2018 Full text

    Brand knowledge is determined by customer knowledge. The opportunity to develop brands based on customer knowledge management has never been greater. Social media as a set of leading communication platforms enable peer to peer interplays between customers and brands. A large stream of such interactions is a great source of information which, when thoroughly analyzed, can become a source of innovation and lead to competitive advantage. Semantic analysis is a prominent field of data mining that deals with key contexts, topics, and sentiment of these interactions. The challenge and key to the success are creating a proper searching algorithm to analyze these areas of interest. The purpose of this study is to develop and to test a methodology which will identify principal points of customers' interactions with fashion brands using a set of Text Mining Algorithms. The fashion industry is one of the most successful in the social media environment. Deep understanding of fashion brand communication is interesting from the theoretical and practical point of view. The theoretical value of this study contributes to the social media brand knowledge management by providing a set of gained insights thanks to the implementation of the new methodological approach presented in this study. The practical value is the knowledge about the presence of fashion brands in social media obtained in the course of the study.

  • THE AGRI-HOOD AND SLOW-SUBURB CONCEPT IN THE CONTEXT OF AN IN-BETWEEN CITY (ZWISCHENSTADT)
    • Gabriela Maria Rembarz
    2018

    The concept of an “in-between-city” (Zwischenstadt) interprets the urban sprawl in Europe as a new, evolving model of urban development, taking the form of urbanized landscapes, which does not correspond with the traditional understanding of urban design. The actual shape of an in-between-city reflects the today’s technology and economy generating new lifestyles: global trends coexist with the locality in a strong relation. The qualification process concordant with the new logic of space creation requires new planning tools. The notion of a slow-suburb, developed on the basis of the agri-hood concept, could be recognized as a new planning category, related to agrarian urbanism. The purpose of introducing the concept of slow city into the planning for metropolitan regions entails addressing the appearing needs firstly, in order to differentiate the metropolitan life style offer, and secondly, to focus on the values represented in the historical suburban relicts, which could be used in the new suburbanization policy. The slow-suburb concept, referring to the research on in-between city, unknown in Poland, addresses the local potentials and the needs.

  • The algorithm of building the hierarchical contextual framework of textual corpora
    • Nina Rizun
    • Wojciech Waloszek
    2018 Full text

    This paper presents an approach for Modeling the Latent Semantic Relations. The approach is based on advantages of two computational approaches: Latent Semantic Analysis and Latent Dirichlet Allocation. The scientific question about the possibility of reducing the influence of these Methods limitation on the Quality of the Latent Semantic Relations Analysis Results is raised. The case study for building the Two-level Hierarchical Contextual Framework of Textual Corpora was performed. The main scientific contributions of this research are: using the paragraphs as a topically completed textual messages can guarantee that it will be centered on a single topic; collecting the topics within the Corpora via its identification in each document separately is the instrument for preventing the model size increasing; film’s review as a specific type of textual document have the approximately similar writing style only within the Corpora with the same semantic tonality.

  • The analysis of firms’ involvement in internationalisation and determinants of its intensity – an analysis for developing and post-transition economies
    • Joanna Wolszczak-Derlacz
    2018 Full text Economics and Business Review

    The study presents the empirical analysis of firms’ involvement in different forms of internationalisation: export, indirect export, import, indirect import and finally simultaneous exporting and importing. The analysis is based on firm-level data from the World Bank Enterprise Survey (March 2017 release). The empirical part is divided into two stages. Firstly account is taken of firms’ heterogeneity and then a Melitz type analysis of the firms’ likeliness of being involved in international activity is performed. Secondly the sample of firms is limited to only those involved in the internationalisation process and then a regression is carried out with the export/import intensity being the dependent variable. The results indicate that determinants of the foreign markets are different from those connected with trade intensity with the exception of the foreign ownership which is the only one associated in the same way with involvement in internationalisation and with its intensity.

  • The analysis of temperature changes of the saliva traces left on the fur during laboratory rats social contacts
    • Magdalena Mazur-Milecka
    • Jacek Rumiński
    2018

    Automatic analysis of complex rodent social be- havior, especially aggressive ones, is of important scientific interest. In this paper we analyze the properties of the data created as a result of aggressive rodent social behavior. Detec- tion of specific aggressive behaviors is based on the event of leaving traces of saliva on the fur of the attacked individual, which are clearly visible in the thermal imaging. The traces change temperature in time in a specific way. After bite, saliva is cooled and then heated to the body temperature. Usage of this method in social behavior analysis ensures detection and tracking aggressive behaviors even if the event itself is invisible.

  • The analysis of the accuracy of spatial models using photogrammetric software: Agisoft Photoscan and Pix4D
    • Tadeusz Widerski
    • Karol Daliga
    • Adrianna Barbasiewicz
    2018

    This article was created as a result of research conducted within the master thesis. The purpose of the measurements was to analyze the accuracy of the positioning of points by computer programs. Selected software was a specialized computer software dedicated to photogrammetric work. For comparative purposes it was decided to use tools with similar functionality. As the basic parameters that affect the results selected the resolution of the photos on which the key points were searched. In order to determine the location of the determined points, it was decided to follow the photogrammetric resection rule. In order to automate the measurement, the measurement session planning was omitted. The coordinates of the points collected by the tachymetric measure were used as a reference system. The resulting deviations and linear displacements oscillate in millimeters. The visual aspects of the cloud points have also been briefly analyzed.

  • The analysis of the determination of points positions using photogrammetric methods
    • Tadeusz Widerski
    • Karol Daliga
    • Adrianna Barbasiewicz
    2018

    This article was created as a result of research conducted within the master thesis. The purpose of the research was to analyze the accuracy of determining the actual position of the photographed points according to the calculated parameters. The accuracy of photos alignment was determined as parameters, which determine their external and internal orientation. In order to determine the location of the determined points, it was decided to follow the photogrammetric resection rule. In order to automate the measurement, the measurement session planning was omitted. The resulting deviations and linear displacements oscillate in millimeters. Analysis was performed for 3 levels of alignment accuracy. For each align level, line differences of photopoints coordinates obtained from photogrammetric model and total station measurements were analysed. There were also analysed horizontal and vertical directions of photopoints location. In this way were obtained parameters similar to “displacement” vector connecting points measured by total station and estimated from photogrammetric model.

  • The analysis of the influence of the corrosion protection method of selected steel elements on the steel structure life cycle costs
    • Adam Kristowski
    • Beata Grzyl
    • Dariusz Kowalski
    2018 Full text

    Steel products are widely used in the construction for the performance of essential and additional elements of engineering structures. They are characterized by high tensile strength, compression and bending, the structure homogeneity, the possibility of assembly regardless of the season and climatic conditions, ease of processing and the possibility of almost any shape. The main disadvantage of steel structures is their high susceptibility to corrosion, which depends on local operating conditions and the type of applied corrosion protection system. The aim of the research carried out by the authors is to indicate the possibility of reducing the costs associated with anti-corrosion protection, incurred at the stage of operation of the steel structure over a period of several decades. The scope of the research includes the life cycle cost analysis for selected steel elements using three alternative corrosion protection systems. The subject of the research is the analysis of the influence of the corrosion protection method of selected steel constructions on its life cycle costs. On the chosen example of the selected object and problems related to its use and maintenance, the possibility of using a singlelayer protection in the form of a metallization coating made in a hot-dip galvanizing process, a three-layer varnish coating based on liquid paints and protection composed of a galvanized metallization coating and a two-layer paint coating is considered. The assessment is carried out in accordance with the life-cycle cost estimation algorithm (LCC).

  • The Antimicrobial Potential of Bacteria Isolated from Honey Samples Produced in the Apiaries Located in Pomeranian Voivodeship in Northern Poland
    • Magdalena Pajor
    • Randy Worobo
    • Sławomir Milewski
    • Piotr Szweda
    2018 Full text International Journal of Environmental Research and Public Health

    The principal objective of this study was to determine whether the honeys produced in apiaries located in Pomeranian Voivodeship (Northern Poland) contain bacteria producing metabolites with growth inhibition potential against important human and animal pathogens. The pathogens included Staphylococcus aurues, Staphyloccocus epidermidis, Escherichia coli, Listeria monocytogenes, Pseudomonas aeruginosa, and Candida albicans. From 12 samples of honey, 163 strains of bacteria were isolated. Activity against reference staphylococci: S. aurues ATCC 25923; S. aureus ATCC 29213; S. epidermidis 12228 was observed in 33 (20.3%), 38 (23.3%), and 41 (25.1%) isolates, respectively. High inhibitory activity was also found against Listeria monocytogenes ATCC 7644 in 34 strains (20.9%). Activity against Candida albicans ATCC 10231 and especially Gram-negative bacteria: Pseudomonas aeruginosa ATCC 27857 and Escherichia coli ATCC 25922 was rarely observed. Production of metabolites exhibiting activity against the three pathogens mentioned above was confirmed for 13 (7.8%), 3 (1.8%), and 2 (1.2%) isolates, respectively. Forty-six isolates were selected for further analysis. Within this group, metabolites synthesized by 18 producing strains (39.13%) inhibited growth of only one of the reference strains of pathogenic microorganisms. However, 14 (30.44%), 8 (17.39%), and 6 (13.04%) strains produced agents active against three, two, and four pathogens, respectively. Sequencing of the 16S rRNA gene revealed that 80.4% of these 46 producing strains belong to the genus Bacillus. However, some producing strains belonging to the genus of Peanibacillus, Lysinibacillus, Microbacterium, and Staphylococcus were also identified. Furthermore, the analysis of the sequences of 16S rRNA, as well as RAPD-PCR, exhibited a significant diversity in the strains tested, even in the case of bacteria isolated from the same honey (and classified to the same genus, usually Bacillus spp.). This observation suggests environmental origin (nectar, water, or pollen) of the producing strains. The research carried out confirmed that honey produced in Northern Poland is a promising source of strains of bacteria producing metabolites with antimicrobial activity.

  • The applicability of low-cost PM10 sensors for atmospheric air quality monitoring
    • Bartosz Szulczyński
    • Jacek Gębicki
    2018 Full text

    Described in this work are the results of field tests carried out in the Tricity Agglomeration between 01 April 2018 and 30 June 2018 in order to evaluate the usefulness of low-cost PM10 sensors in atmospheric air quality monitoring. The results were juxtaposed with the results obtained using reference methods. The results were validated based on the measurement uncertainty as described in the EU report "Demonstration of Equivalence of Ambient Air Monitoring Methods. EC Work ing Group on Guidance for the Demonstration of Equivalence". Moreover, the impact of external factors (humidity, pressure, temperature) on the obtained results was also assessed. It was shown that the low-cost sensors display measurement uncertainty which exceeds the acceptable values as compared to the reference methods and correction factors depending on the measured PM10 concentration need to be introduced in order to fulfil the criteria of equivalence.

  • The application of environmental issues in designing urban structures – a framework for comprehensive local planning policies
    • Joanna Badach
    2018 World Scientific News

    The implementation of environmental issues in planning and designing urban structures is becoming a novel approach and a common practice consistent with the paradigm of sustainable development. Maintaining environmental quality in urban areas, managing natural resources and understanding the complexity of urban systems is becoming increasingly challenging. Therefore, it is important to develop strategies for the integration of environmental quality research into urban planning policies and for the development of alternative spatial solutions for the existing urban structure which are aimed at improving environmental quality in urban areas. The aim of the article is to review contemporary theoretical and practical approaches towards the implementation of environmental issues within the process of urban planning in order to present a framework for local planning policies. Described is the research into spatial and design solutions which can efficiently reduce noise levels, mitigate atmospheric pollution and odour nuisance or prevent the negative effects of local microclimate effect. The possibility of application of design guidelines aimed at achieving environmental objectives in local planning documents is also assessed.

  • The application of microscopic models in the study of pedestrian traffic
    • Lucyna Gumińska
    • Jacek Oskarbski
    2018 Full text MATEC Web of Conferences

    Cities (especially in Central and Eastern Europe) focus on improving the road network, which aims to improve the efficiency of motor traffic and minimize congestion. Most of existing tools for analysing the effectiveness of urban transport networks do not assume to analyse the impact of walking and cycling on efficiency of transport systems. It is therefore necessary to develop solutions that on the one hand will reduce congestion, and on the other hand, improve the safety and quality of travel of vulnerable road users. One of the tasks to be developed in order to improve pedestrian conditions is to determine the relationship between pedestrian and vehicle traffic. An attempt has been made to establish the relationship between pedestrians and vehicle trafficin order to describe traffic conditions and pedestrian safety at pedestrian crossings. The analyseswere based on simulations carried out using the PTV Vissm/Viswalk software and with the use of surrogate safety measures.

  • The application of non-destructive methods in the diagnostics of the approach pavement at the bridges
    • Mikołaj Miśkiewicz
    • Jacek Lachowicz
    • Paweł Tysiąc
    • Piotr Jaskuła
    • Krzysztof Wilde
    2018 Full text IOP Conference Series: Materials Science and Engineering

    The article presents the possibility of using non-destructive methods of road pavement diagnostics as an alternative to traditional means to assess the reasons for premature cracks adjacent to bridge objects. Two scanning methods were used: laser scanning to measure geometric surface deformation and ground penetrating radar (GPR) inspection to assess the road pavement condition. With the use of a laser scanner, an effective tool for road deformation assessment several approach pavement surfaces next to the bridges were scanned. As the result, a point cloud was obtained including spatial information about the pavement deformation. The data accuracy was about 3 mm, the deformations were presented in the form of deviation maps between the reference surface and the actual surface. Moreover characteristic pavement surface cross-sections were presented. The in situ measurements of the GPR method were performed and analysed in order to detect non-homogeneity in the density of structural layers of the pavement. Due to the analysis of the permittivity of individual layers, it was possible to detect non-homogeneity areas. The performed GPR measurements were verified by standard invasive tests carried out by drilling boreholes and taking cores from the pavement and testing the compaction and air voids content in asphalt layers.. As a result of the measurements made by both methods significant differences in layer compacting factor values were diagnosed. The factor was much smaller in the area directly next to the bridgehead and much larger in the zone located a few meters away. The research showed the occurrence of both design and erection errors as well as those related to the maintenance of engineering structures.

  • The Application of Vibration Recording and Analysis in Tribological Research on Sliding Friction
    • Jacek Łubiński
    • Krzysztof Druet
    2018

    The paper reports on a tribological research on the macroscopic manifestation and characteristics of sliding friction. The aim of the task was to measure friction in lubricated sliding contacts and test the interactions between the environment (the test rig) and the experimental friction contact. Friction-induced vibrations were observed and studied as a manifestation of the process. The typical set of velocity and force/torque transducers was supplemented with a multi-channel vibration detection system. The vibro-diagnostic augmentation of the tribological experiment gave a new insight into the nature of motion of the system and load–velocity–friction relations. Modes of operation of the system were identified by spectral analysis in confrontation with natural frequencies of vibration of the test rig’s sub-systems.

  • The buckling analysis of a cold-formed steel C-sectional column resting on an elastic foundation
    • Patryk Deniziak
    • Piotr Iwicki
    2018 Full text MATEC Web of Conferences

    The paper is focused on stability analysis of different models of steel cold-formed C-section column. The analysed element may be applied as a primary load-bearing member in steel trusses or silo columns. The column can be used as a support for a wall of roof plates made of corrugated sheets. The wall sheeting that restrains the column against buckling may be considered as an elastic foundation. Due to the design solutions the foundation may be modelled as a series of lateral translational or rotational elastic supports. Such model is used for example in silo column analysis. In the paper linear bifurcation analysis (LBA) of axially compressed columns with different type of elastic foundation is carried by means of ABAQUS software. The analysed thin-walled column (C 250×100×33×4) is regarded as a load-bearing element in a steel hall. The column was modelled by shell elements, the foundation modelled by means of elastic supports. The column length was 5000 mm. The authors present a 3D image of an influence of lateral translational and rotational elastic supports on the buckling resistance of the column.