2014 - Publications Repository - Gdańsk University of Technology

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Publications from the year 2014

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Smart experience engineering to support collaborative design problems based on constraints modelling
- Edward Szczerbicki
- Cesar Sanin
2014 JOURNAL OF INTELLIGENT & FUZZY SYSTEMS
Engineering design is a knowledge intensive process. Experts' experiences from different product life-cycle stages play a key role in problem solving during design decision making by linking up knowledge to find better solutions for a specific design problem. Different approaches have been used to support Collaborative and Concurrent Product Design, such as Constraint Satisfaction Problem (CSP) modelling. Additionally, due to the need of capitalizing these experiences, the Set of Experience Knowledge Structure (SOEKS) is used to store and manage experiences of decision making process. However it was necessary to adapt the structure to property manage the constraints approach used in Engineering Design. This article presents a proposed adaptation to SOEKS structure in order to be able to store and reuse CSP design experiences for further re-use and analysis of multiple experiences. Finally, a case study is presented in order to show how the proposed approach can be used in the industrial applications.
Smart Virtual Bass Synthesis Algorithm Based on Music Genre Classification
- Piotr Hoffmann
- Tomasz Sanner
- Bożena Kostek
2014
The aim of this paper is to present a novel approach to the Virtual Bass Synthesis (VBS) algorithms applied to portable computers. The proposed algorithm employed automatic music genre recognition to determine the optimum parameters for the synthesis of additional frequencies. The synthesis was carried out using the non-linear device (NLD) and phase vocoder (PV) methods depending on the music excerpt genre. Classification of musical genres was performed utilizing the k-Nearest Neighbor algorithm and the extracted MPEG 7-based feature vectors. To confirm the relationship between the presented music excerpt genre and the listener’s preferences, subjective tests were carried out. The pairwise comparison test was performed. Test material consisted of 18 pair samples belonging to six music genres: classical, pop, rock, rap, jazz, electronic. For comparison purposes music samples were prepared with the benchmark MaxxBass system and the Smart VBS algorithm proposed by the authors. On the basis of the listeners’ opinions statistical tests were carried out to confirm the validity of adjusting low frequency synthesis settings according to the music content of audio files.
Smoking: Traditional
- Zdzisław Sikorski
- Izabela Sinkiewicz
2014
Smoking, drying, and salting belong to the oldest methods of food preservation. Meat hung by the fire was preserved by a combination of drying and smoking. Often the raw material was first pickled in brine. In different regions of the world various procedures have been developed, best suited for treating meats and fish for specific purposes. Smoking extended the shelf life and imparted very desirable, new sensory properties to the products. The role of its preservative effect decreased with the advent of canning, modern chilling, and freezing, whereas the aspects of flavoring and safety gained importance. Nowadays smoking is applied in many forms to treat as much as 40–60% of the total amount of meat products.
Social enterprises as a fertile ground for reducing social and economic exclusion - good practice examples from Poland
- Marzena Starnawska
2014
The work briefly outlines the two dimensions of value generated by social enterprises to the economy and society. This is done in reference to the social cooperatives in Poland that are good examples of social enterprises according to EMES indicators
SOCIAL ENTREPRENEURS – WHAT MAKES THEM DIFFERENT FROM BUSINESS UNDERTAKERS
- Julita Wasilczuk
- Michał Łuński
2014 Full text Przedsiębiorstwo we współczesnej gospodarce - teoria i praktyka
Social entrepreneurs, very often operate with highly limited resources, not to say with virtually nothing. They possess motivation, but apart from financial or technical resources very often they also need complex set of skills, especially those connected with leadership. Social entrepreneurship is similar to business entrepreneurship in many way, however there are some differences. Both similarities and differences can be find in theoretical papers, however there is a limited number of research which prove them. A research conducted in 2014 among 76 respondents, engaged in business and social activities, proved that to some extent social and business entrepreneurs have some common features, however some of them are unique for each of this entrepreneurship type.
Software Modeling from the Perspective of Intuitive Information Processing
- Anna Bobkowska
2014
There is psychological evidence that humans process information not only consciously but also intuitively. Intuitive information processing is present also during the activities related to software modeling. The goal of this paper is to analyze software modeling from the perspective of theories which describe intuitive (nonconscious, implicit) information processing. The paper includes presentation of relevant psychological theories, cross-analysis of issues related to software modeling from their perspective, a case study of interplay between rational and intuitive process, and discussion of findings from the perspectives of both mainstream software engineering and software psychology approaches.
Software Tools to Measure the Duplication of Information
- Marian Kostrzewski
2014 Journal of Applied Computer Science
Data stored in average computer system usually is not unique, portions of stored data are duplicated. When duplicated data are stored in separate files containing source code of computer program of student homework, a possibility of cheating should be seriously considered. This paper presents software tools built, in order to detect re-use of pieces of code in supplied text files. Three aspects of information atching are considered: identity, similarity, and analogy. Built tools have proved useful in real life situations.
Solid State Conductivity of Optimized Polypyrrole Coatings on Iron Obtained from Aqueous Sodium Salicylate Solution Determined by Impedance Spectroscopy
- Karolina Cysewska
- Ferdinand Singer
- Piotr Jasiński
- Sannakaisa Virtanen
2014 Full text International Journal of Electrochemical Science
In this work the optimization procedure for corrosion resistance, surface analysis and electrical properties of PPy-Fe electrodes have been examined. Polypyrrole (PPy) film was electrochemically synthesized in a one step process from an aqueous solution of sodium salicylate and pyrrole with certain concentrations, different parameters and type of polymerization process. The PPy-Fe electrodes were analyzed using scanning electron microscopy (SEM) and x-ray photoelectron spectroscopy (XPS). The adhesion of PPy was tested by applying ASTM sellotape test which proved that PPy coatings are strongly adherent to the iron surface. Potentiodynamic polarization in 0.1M NaCl showed improvement of corrosion protection properties of coated PPy-Fe sample compared to the bare iron. The degree of improvement depends on the concentration of sodium salicylate and pyrrole, deposition time, deposition techniques and its parameters, and on the pH of solution. Impedance spectroscopy (IS) measurements showed different impedance behavior and conductivity of PPy depending on the current density at which the polymer was synthesized.
Solutions of Power Electronics Converter for the Shore - to - Ship Power Systems
- Ryszard Strzelecki
2014 Automatyka Elektryka Zakłócenia
W artykule poruszono tematykę zasilania statków zacumowanych w porcie z lądowej sieci elektroenergetycznej poprzez wykorzystanie nowoczesnych konstrukcji przekształtników energoelektronicznych. Zaproponowano budowę sieci dystrybucyjnej prądu stałego, przewoźnej platformy zasilającej oraz zastosowanie zasobników energii
Some fundamental aspects of self-levitating sliding contact bearings and their practical implementations
- Tadeusz Stolarski
2014 PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
In this study, fundamental aspects and mechanisms of acoustic levitation together with governing equations are presented first. Then, the acoustic levitation phenomenon is considered as a new way to design air suspension systems capable of self-levitation. A particular emphasis is laid on journal bearings and their specific geometrical configuration. A practical feasibility of using acoustic levitation to separate contacting surfaces is supported and illustrated by results of experimental testing of a number of prototype devices.
Some Progress on Total Bondage in Graphs
- Nader Jafari Rad
- Joanna Raczek
2014 Full text GRAPHS AND COMBINATORICS
The total bondage number b_t(G) of a graph G with no isolated vertex is the cardinality of a smallest set of edges E'⊆E(G) for which (1) G−E' has no isolated vertex, and (2) γ_t(G−E')>γ_t(G). We improve some results on the total bondage number of a graph and give a constructive characterization of a certain class of trees achieving the upper bound on the total bondage number.
Sorption of Chlorinated Solvents on Pine and Oak sawdust
- Marek Tobiszewski
2014
The article presents assessment of pine and oak sawdusts as sorbents for removal of chlorinated solvents from water. Sawdusts as potential sorbents were characterized with elemental analysis and BET analyses. Sorption capacity was determined for both pine and oak sawdust towards 1,1,2-trichloroethane, tetrachloroethene and 1,1,1,2-tetrachloroethane. Pine sawdust was able to adsorb greater amounts of chlorinated solvents compared to oak sawdust. Pine sawdust was characterized by larger surface area and its surface was less polar, what promotes sorption. The less polar compounds were sorbed on sawdust surface in greater amounts. Sawdust is weak but cheap sorbent for the removal of chlorinated solvents from water. Its sorption properties could be possibly improved by chemical or physical modification of its surface.
Sound Field Intensity Measurements and Visualization around the Human Head Model . Rozkłąd natężenia pola akustycznego w komorze bezechowej obecności sztucznej głowy i w przypadku braku jej obecności
- Bożena Kostek
- Adam Kurowski
- Piotr Kryger
- Andrzej Czyżewski
2014
The main goal of this research study was to measure and visualize sound field intensity distribution in and without presence of the human head model. Measurements were performed in the anechoic chamber with the 5 cm grid. Experimental setup consisted of a multitone generator, two loudspeakers, human head model, intensimetric probe, the Cartesian robot applied for precise positioning of the acoustic sensor, and an analyzer. Based on the collected data a sound field visualization was created in the form of colored maps and arrows illustrating pressure and intensity vectors at a given point in the presence of the artificial head, as well as without this obstacle plus the difference resulted from the both mentioned conditions occurrence. A thorough analysis of the results obtained and conclusions follows the experiments presented in the paper.
Sources of investment risk in urban regeneration projects
- Magdalena Apollo
- Justyna Brzezicka
2014 Full text Czasopismo Techniczne
The scope of the article includes multidimensional risk analysis of urban regeneration projects, whose base is to identify areas of its occurrence. Authors thoroughly analyze the sources of potential threats and attempts to answer the question, what is their contribution into overall urban regeneration’ investment risk. The target concept will be used to assess the level of investment risk at the stage of initiation, preparation and planning of urban regeneration projects, which is to improve the risk management process.
„Space, architecture and infrastructure “in-between cities”.
- Aleksandra Sas-Bojarska
- Magdalena Rembeza
2014
The article presents contemporary city problems, like division of the city, infrastructural barriers, empty spaces, chaotic development, cuting-off areas, threatening the city image and functioning. These problems can be best observed in the areas in-between cities. One of the main questions for urban planners and architects seems thus to be: how to connect the city spaces instead of creating the barriers, how to create the areas “in-between” friendly, safe and attractive? The presented case study, related to the space, architecture and infrastructure between Gdansk and Sopot in Poland, illustrates the issues arising from the wrong spatial planning system and the lack of coherent policy between the neighbouring cities, causing spatial, functional and visual barriers. The article presents some ideas and guidelines helping to solve such problems. The set of integrated mitigation measures such as environmental policy, spatial and urban planning, metropolitan plans, SEA/EIA system and landscape architecture which are still not sufficiently implemented in practice in Poland, has been presented. They can be used to protect and enhance unique environment, cultural heritage and landscape and to create new values, like attractive public spaces in-between cities.
Space syntax analysis - methodology of understanding the space
- Weronika Dettlaff
2014
Nowadays space is considered as a net of connections between different areas. The questions how to delineate its character and how it is possible to objectively compare two spaces is the matter under consideration. This was the reason for creating new theories about the structure of place. "Space syntax analysis" (SSA) or simply "Space Syntax" defines a number of theories and research areas devoted to the analysis of space configuration. Ongoing research and observations of the configuration of spatial settlements and human behaviour within in the past years showed a close relationship between the physical structure of space and the quality of life of its inhabitants. SSA is used as an academic and commercial tool to analyze projects in urban and building scale. It is a tool of sustainable development which allows studying movement of space users, crime in the city, anti-social behaviour, economics and viability of the service, transport or health behaviour.
Spatial planning on regional level
- Tomasz Parteka
- Dorota Dominika Kamrowska-Załuska
2014
Polish spatial planning results from typical for countries of Central and Eastern Europe transition . They have undergone the transformation from decentralized management system based on the dominance of state to the system of representative democracy, based on self-government administration; also territorial on regional level.
Speciation of Iron in the Aquatic Environment
- Anna Rabajczyk
- Jacek Namieśnik
2014 WATER ENVIRONMENT RESEARCH
Iron is one of the basic metals occurring in the aquatic environment and it is considered a macroelement with regard to live organisms. This metal has a broad range of applications that, together with factors conditioning its chemical transitions, results in the occurrence of many iron species in water. Depending on water and land development type, as well as the use of water for household and industrial purposes, iron may be found in different forms, including solutions, colloids or suspensions, made up by both simple ions or particles and complex organic or inorganic compounds. Due to changing properties of the different iron forms and their varying influence, it is critical to gain information about its speciation. In this article we present information about iron species, including nano-iron forms, in various aquatic environments (i.e., marshland, ocean waters) as well as the exemplary methods for separating iron from iron-containing environmental samples.
Specificity of Infant Digestive Conditions: Some Clues for Developing Relevant In Vitro Models
- Claire Bourlieu
- Olivia Ménard
- Karima Bouzerzour
- Giuseppina Mandalari
- Adam Macierzanka
- Alan Mackie
- Didier Dupont
2014 CRITICAL REVIEWS IN FOOD SCIENCE AND NUTRITION
Digestion of nutrients is an essential function of the newborn infant gut to allow growth and development and understanding infant digestive function is essential to optimize nutrition and oral drug delivery. Ethical considerations prohibit invasive in vivo trials and as a consequence in vitro assays are often conducted. However, the choice of in vitro model parameters are not supported by an exhaustive analysis of the literature and do not mimic precisely the digestive conditions of the infant. This review contains a compilation of the studies which characterized the gastroduodenal conditions in full-term or preterm infants of variable postnatal age from birth up to six months. Important data about healthy full-term infants are reported. The enzymatic (type of enzymes and level of activity) and nonenzymatic (milk-based diet, frequency of feeding, bile salt concentrations) conditions of digestion in infants are shown to differ significantly from those in adults. In addition, the interindividual and developmental variability of the digestive conditions in infants is also highlighted.
Spectroscopic properties of Rhodamine B entrapped in hybrid porous nanolayers at high dye concentration
- Aneta Lewkowicz
- Anna Synak
- Beata Grobelna
- Leszek Kułak
- Piotr Bojarski
2014 CHEMICAL PHYSICS
The preparation procedure and characterization of Rhodamine B entrapped in zirconia, silica and mixed silica–zirconia nanolayers is described. The nanolayers were produced by the sol–gel spin-coating technique. The pronounced effect of the dye concentration on the absorption and fluorescence spectra as well as on time-resolved fluorescence spectra was found. The results show that the aggregation of Rhodamine B is stronger in silica based matrices compared to zirconia nanolayers. Time-resolved emission spectra at highest Rhodamine B concentration show that the dye aggregates are fluorescent.