2015 - Publications Repository - Gdańsk University of Technology

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Publications from the year 2015

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A novel method of Mycobacterium tuberculosis complex strain differentiation using polymorphic GC-rich gene sequences.
- Roman Kotłowski
2015 Acta Biochimica Polonica
Tuberculosis is one of the leading infectious diseases. In this work, a new genotyping method of Mycobacterium tuberculosis (Mtb) complex strain is presented. 27 Mtb genomes were analyzed for the presence of length polymorphism within polymorphic GC-rich gene sequences. Four genes, Rv3345c, Rv3507, Rv0747 and Rv3511, showing variation in length depending on the Mtb strain were selected for designing primer sequences flanking variable regions for the PCR method. Identification of 16 genotypes among 27 analyzed genomes demonstrated usefulness of our genotyping method in differentiation of Mtb genomes based on sequence polymorphism in the four PGRS genes.
A Novel Multicast Architecture of Programmable Networks
- Jakub Kiciński
- Michał Hoeft
2015
In the paper a multicast architecture for programmable networks based on separation of group management and network control tasks is proposed. Thanks to this separation, services which want to make use of multicast communications no longer have to implement low-level network functionalities and their operation is greatly simplified. Abstracting service’s view of the network into a fully connected cloud enables us to transparently implement within the network complex features such as host mobility without any disturbances to the operation of the service or it’s clients. Aspects of the multicast architecture such as signaling, addressing, form of data delivery, security and cooperation with legacy applications are discussed; precise requirements for interfaces specified.
A remark on singular sets of vector bundle morphisms
- Maciej Starostka
- Nils Waterstraat
2015 Central European Journal of Mathematics
If characteristic classes for two vector bundles over the same base space do not coincide, then the bundles are not isomorphic. We give under rather common assumptions a lower bound on the topological dimension of the set of all points in the base over which a morphism between such bundles is not bijective. Moreover, we show that this set is topologically non-trivial.
A review: Fabrication of porous polyurethane scaffolds
- Helena Janik
- Michalina Mallach
2015 Materials Science & Engineering C-Materials for Biological Applications
The aim of tissue engineering is the fabrication of three-dimensional scaffolds that can be used for the reconstruction and regeneration of damaged or deformed tissues and organs. A wide variety of techniques have been developed to create either fibrous or porous scaffolds from polymers, metals, composite materials and ceramics. However, the most promising materials are biodegradable polymers due to their comprehensive mechanical properties, ability to control the rate of degradation and similarities to natural tissue structures. Polyurethanes (PUs) are attractive candidates for scaffold fabrication, since they are biocompatible, and have excellent mechanica properties and mechanical flexibility. PU can be applied to various methods of porous scaffold fabrication, among which are solvent casting/particulate leaching, thermally induced phase separation, gas foaming, emulsion freeze-drying and melt moulding. Scaffold properties obtained by these techniques, including pore size, interconnectivity and total porosity, all depend on the thermal processing parameters, and the porogen agent and solvents used. In this review, various polyurethane systems for scaffolds are discussed, aswell as methods of fabrication, including the latest developments, and their advantages and disadvantages.
A Simulative Comparison of Ship Domains and Their Polygonal Approximations
- Rafał Szłapczyński
- Joanna Szłapczyńska
2015 Full text TransNav - The International Journal on Marine Navigation and Safety of Sea Transportation
The paper investigates the impact of a precise ship domain shape on the size of collision avoidance manoeuvres. The considered collision avoidance manoeuvres include both course and speed alterations. Various ship domains are compared with their polygonal approximations, which vary in the number of points of a domain contour and placement of these points. The best of all considered approximations is determined in the course of simulation experiments performed for head‐on, crossing and overtaking situations. The chosen number and placement of contour points combine precision of domain approximation with reasonable computational time.
A solvent selection guide based on chemometrics and multicriteria decision analysis
- Marek Tobiszewski
- Stefan Tsakovski
- Vasil Simeonov
- Jacek Namieśnik
- Francisco Pena-Pereira
2015 GREEN CHEMISTRY
The selection of suitable solvents is a crucially important subject in a wide range of chemical processes. This study presents a solvent selection guide where 151 solvents were assessed, including a significant number of recently reported bio-based solvents. The assessment procedure involves grouping of solvents according to their physicochemical parameters and ranking within clusters according to their toxicological and hazard parameters. Grouping of solvents resulted in the formation of three clusters – nonpolar and volatile (35 solvents), nonpolar and sparingly volatile (35 solvents) and polar ones (81 solvents). The comparison of toxicological and hazard related data indicated that solvents from the third cluster should be preferentially chosen. Within each group, a solvent ranking was performed by means of the TOPSIS procedure based on 15 different criteria. Because of the lack of certain data (especially toxicological), different ranking confidence levels were introduced. The highest confidence rankings were performed only for some solvents but with all the considered criteria. Low confidence rankings were created for all solvents but were based on certain criteria only. The results of our solvent selection guide (SSG) are generally in agreement with the results of others but allow for finer ranking of solvents. The assessment procedure is easy to adapt to individual chemists’ needs and allows including new solvents to the ranking.
A Special Section on Intelligent User Interfaces in Healthcare (IUIH)
- Jerzy Wtorek
2015 Journal of Medical Imaging and Health Informatics
A concept of interface has evolved from the first appearance in the form of a command line interface to the established use of direct manipulation or WIMP (windows, icons, menus and pointing) interfaces in nearly all applications. Intelligent user interfaces (IUI) form a subfield of Human-Computer Interaction research. Optimal human-computer interactions are defined as ones where users are able to perform complex tasks more quickly and accurately, thus improving user satisfaction. The aim of IUI is to improve human-computer interaction by using smart and new technologies.
A spectroscopic study of the cis/trans-isomers of penta-2,4-dienoic acid attached to gold nanoclusters
- Federico Latorre
- Julien Guthmuller
- Philipp Marquetand
2015 Full text PHYSICAL CHEMISTRY CHEMICAL PHYSICS
In this theoretical work, we present a spectroscopic analysis of the cis/trans-isomers of a molecular switch, penta-2,4-dienoic acid, attached to gold clusters of different size (1, 2 and 20 gold atoms). We have simulated 4 different spectroscopic techniques: Infrared spectroscopy, normal Raman scattering, absorption spectra and resonance Raman scattering. We discuss how the position and the conformation of the molecule determine the electronic structure and hence, the spectra. The calculations have been performed using density functional theory for the properties of the ground state and time-dependent density functional theory for the excited-state properties. Special emphasis is put on the resonance Raman spectra for the study of the isomers. In the present case, resonance Raman scattering is best suited to discriminate between the isomers on the gold clusters.
A study of the electronic states of pyrimidine by electron energy loss spectroscopy
- Ireneusz Linert
- Mariusz Zubek
2015 Full text CHEMICAL PHYSICS LETTERS
The electron energy loss spectra were measured in pyrimidine at the constant electron residual energy varied from 15 meV to 10 eV and in the scattering angle range 0–180°. The spectra were analysed applying an iteration fitting procedure to resolve the energy loss bands corresponding to excitation of the electronic states of pyrimidine. The vertical excitation energies of the singlet states of pyrimidine and of a number of the triplet states were determined. The presently observed triplet states were tentatively assigned.
A study on the protection of methionine and the reduction of methionine sulfoxide in methionine-containing analogues of the growth-modeling factor Gly-His-Lys
- Monika Kukowska
- Magdalena Kukowska-Kaszuba
- Krystyna Dzierzbicka
2015 TETRAHEDRON LETTERS
The protection of methionine and the reduction of methionine sulfoxide in methionine-containing analogues of Gly-His-Lys are described. The peptides were synthesized by a solid-phase method using the standard Fmoc procedure. Simultaneous deprotection of the peptide side chain and liberation from the resin were achieved using an appropriate TFA cocktail. The TFA cocktail was selected to minimize oxidation of the methionine residue. The reversible method of methionine oxidation was also studied. Selective identification and quantitative analysis of the methionine-containing peptides are based on an LC–MS study.
A Target Information Display for Visualising Collision Avoidance Manoeuvres in Various Visibility Conditions
- Rafał Szłapczyński
- Joanna Szłapczyńska
2015 JOURNAL OF NAVIGATION
The paper introduces a new approach to displaying information on targets. The proposed display visualises three types of information: targets’ motion parameters (typical for target tracking), combinations of own course and speed which collide with those targets (typical for Collision Threat Parameters Area display by Lenart (1983)) and combinations of own course and speed which are not compliant with COLREGS in this case (based on ships’ motion parameters and visibility conditions). A superposition of the last two types of data enables a navigator to quickly choose a collision avoidance manoeuvre which is both sufficient and COLREGS-compliant. Additionally, the displayed data may be filtered based on the remaining Time To Collision (TTC) so that navigators can concentrate on direct threats. The paper includes a description of the proposed visualisation technique as well as examples of visualised data for some encounter situations.
A Task-Scheduling Approach for Efficient Sparse Symmetric Matrix-Vector Multiplication on a GPU
- Piotr Andrzej Mironowicz
- Adam Dziekoński
- Michał Mrozowski
2015 SIAM JOURNAL ON SCIENTIFIC COMPUTING
In this paper, a task-scheduling approach to efficiently calculating sparse symmetric matrix-vector products and designed to run on Graphics Processing Units (GPUs) is presented. The main premise is that, for many sparse symmetric matrices occurring in common applications, it is possible to obtain significant reductions in memory usage and improvements in performance when the matrix is prepared in certain ways prior to computation. The preprocessing proposed in this paper employs task scheduling to overcome the difficulties that have suppressed the development of methods taking advantage of the symmetry of sparse matrices. The performance of the proposed task-scheduling method is verified using Kepler (Tesla K40c) graphics accelerator, and is compared to the performance of cuSPARSE library functions on a GPU and to functions from the Intel MKL on Central Processing Units (CPUs) executed in the parallel mode. The obtained results indicate that the proposed approach for a sparse symmetric matrix-vector products results in up to a 40% reduction in memory usage, as compared to non-symmetric matrix storage formats, while retaining good throughput. Compared to cuSPARSE and Intel MKL functions for sparse symmetric matrices, the proposed TSMV approach allowed us to achieve a significant speedup (of over one order of magnitude).
A telemedical and an outpatient thoracic impedance measurements - a validation algorithm of the electrodes placement
- Tomasz Kocejko
- Artur Poliński
- Jerzy Wtorek
- Marzena Romanowska-Kocejko
- Marcin Gruchała
2015
This paper presents the algorithm for validation of electrodes locations for the thoracic impedance measurements. In particular the presented algorithm was designed to perform the telemetric sleep apnea monitoring. One of the problems, during the clinical tests of a developed device, was to preserve the repeatability of measurements. It strongly depended on the appropriate electrodes placement on the examined person’s thorax. It seems that the developed software, which allows inspecting the electrodes localization, significantly increases a possibility of impedance based sleep apnea monitoring at home. In this article, the properties of the evaluation algorithm of electrodes placement accuracy are presented.
A VISION-BASED UNMANNED AERIAL VEHICLE NAVIGATION METHOD
- Paweł Burdziakowski
- Artur Janowski
- Marek Przyborski
- Jakub Szulwic
2015
The satellite navigation systems are the main position sources for unmanned aerial vehicles (UAVs). This fact limits the area of UAVs operation to the places where radio signals is visible for a satellite navigation system receiver, mounted on the vehicle-outdoor navigation. Closed spaced are unavailable for vehicles which navigation is based on global satellite navigation systems (GNSS). Miniature UAV (MiniUAV) is able to operate successfully within a indoor environment, however is has to be supported by teleoperation system operated by a man. MiniUAV is not able to plot the trajectory and determine their position relatively to the indoor environment. The research presented in the paper are solving a problem of indoor navigation position tracking. Developed and tested method is based on image data acquired by a single non-metric digital camera placed on miniUAV. The paper presents the method of solving a own UAV position, based only on image data, as well as process of UAV navigation supported by developed method and the main advantages and limitations. The method is based on photogrammetry and a modern computer vision algorithms.
ABC Kanalizacji Rola studzienki (1)
- Ziemowit Suligowski
2015 Magazyn Instalatora
Praktyczne zagadnienia związane z doborem kanalizacyjnej studzienki rewizyjnej. Proces inwestycyjny. Nadrzędność warunków eksploatacji. Możliwości eksploatatora, Minimalna średnica; bezpieczna średnica. Przyłączenie do sieci. Maksymalny rozstaw.
ABC Kanalizacji. Rola studzienki (2)
- Ziemowit Suligowski
2015 Magazyn Instalatora
Kanalizacyjna studzienka rewizyjna. Średnica studzienki. Rozwiązania materiałowe. Specyficzne cechy i wymagania. Rodzaj kinety. Posadowienie. Dodatkowe wzmocnienia. Przygotowanie inwestycji.
About being entrepreneurial in challenging environments – theorizing on the social enterprise behavior in Poland
- Marzena Starnawska
2015
Entrepreneurial behaviors in challenging institutional environments have been widely investigated in the literature. One of the characteristics of these environments is resource scarcity. This is particularly valid in the context of social entrepreneurship. The aim of this paper is to identify entrepreneurial behaviors in social entrepreneurship and what is happening behind these processes in the context of transition country, against the backdrop of weak institutions in Poland. We use a purposive sample of 5 social cooperatives, and report the data from several in-depth interviews with their representatives as well as observation in the cooperatives too.We have attempted to widen the existing categories on entrepreneurial behavior namely boundary blurring and diversification, and discuss them in social entrepreneurship context.
Absence of superconductivity in fluorine-doped neptunium pnictide NpFeAsO
- A Walters
- Helen Walker
- R. Springell
- M Krisch
- A Bosak
- Adrian Hill
- C Zvorişte-Walters
- E. Colineau
- J-C. Griveau
- D Bouëxière
- R. Eloirdi
- R. Caciuffo
- Tomasz Klimczuk
2015 JOURNAL OF PHYSICS-CONDENSED MATTER
X-ray diffraction, specific heat, magnetic susceptibility and inelastic x-ray scattering measurements on the transurarium oxypnictides NpFeAsO and NpFeAsO0.85F0.15 are presented. No superconductivity down to 2 K was observed upon fluorine doping, contrary to the structurally analogous rare-earth pnictides. No modification of the phonon density of states was observed upon doping with fluorine. We discuss our results in light of the latest experimental and theoretical studies on the role of phonons in the superconducting pnictide compounds.
Absencja chorobowa - szacunek niewytworzonego PKB
- Justyna Kujawska
2015 Full text Studia Ekonomiczne. Zeszyty Naukowe Uniwersytetu Ekonomicznego w Katowicach
Koszty pośrednie spowodowane absencją chorobową bądź prezenteizmem pracowników są sporadycznie uwzględniane w polskich analizach ekonomicznych. Nie szacuje się wielkości utraconego PKB na skutek chorób, przedwczesnych zgonów, długiego dochodzenia do zdrowia oraz nie uwzględnia w wycenach farmakoekonomicznych. Brakuje jednolitej metodologii obliczania kosztów pośrednich. Celem opracowania jest oszacowanie, ile gospodarka narodowa Polski traci rocznie PKB z powodu absencji pracujących. Do obliczeń zastosowano metodę kapitału ludzkiego wykorzystując informacje statystyczne publikowane przez GUS i ZUS. Wielkość utraconego PKB z powodu absencji chorobowej pracujących w badanych latach 2009-2012 wyceniono na około 70-90 mld zł.
Absorption spectroscopy setup for determination of whole human blood and blood–derived materials spectral characteristics
- Maciej Wróbel
- Marcin Gnyba
- Daria Majchrowicz
- Katarzyna Mitura
- Katarzyna Karpienko
2015
A dedicated absorption spectroscopy system was set up using tungsten-halogen broadband source, optical fibers, sample holder, and a commercial spectrometer with CCD array. Analysis of noise present in the setup was carried out. Data processing was applied to the absorption spectra to reduce spectral noise, and improve the quality of the spectra and to remove the baseline level. The absorption spectra were measured for whole blood samples, separated components: plasma, saline, washed erythrocytes in saline and human whole blood with biomarkers - biocompatible nanodiamonds (ND). Blood samples had been derived from a number of healthy donors. The results prove a correct setup arrangement, with adequate preprocessing of the data. The results of blood-ND mixtures measurements show no toxic effect on blood cells, which proves the NDs as a potential biocompatible biomarkers. © (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.