2013 - Repozytorium publikacji - Politechnika Gdańska

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Publikacje z roku 2013

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A Nyquist filter of fractional delay
- Ewa Hermanowicz
- Mirosław Rojewski
2013
In the paper a novel discrete-time FIR fractonal delay specjal filter is investigated. This is a Nyquist filter which, besides the traditional its attribute (interymbol interference (ISI) free property), has the ability to compensate for subsample transmission delay involved, for example, in multipath propagation channel. The performance of the filter is analysed and illustrated.
A proposal for a knowledge market based on quantity and quality of knowledge
- Leonardo Mancilla-Amaya
- Edward Szczerbicki
- Cesar Sanin
2013 CYBERNETICS AND SYSTEMS
The paper proposes an autonomous market environment in which it is possible to trade knowledge based on its quantity and quality.
A PROPOSAL OF A DESCRIPTION OF THE OPERATING CONDITIONS OF DIESEL-ELECTRIC LOCOMOTIVES
- Paweł Kortas
- Jacek Kropiwnicki
2013 Pełny tekst Combustion Engines
The paper presents a proposal of a description of the operating conditions of diesel-electric locomotives. The proposal is a result of the operational experience and the analysis of the locomotive operation. It constitutes a significant simplification in relation to the descriptions currently used by domestic carriers. The paper also presents examples of analyses of the operating conditions of locomotives using the proposed method.
A prototype femtosecond laser system for MEMS fabrication
- Katarzyna Garasz
- Marek Kocik
- Robert Barbucha
- Mateusz Tański
- Jerzy Mizeraczyk
- Michał Nejbauer
- Czesław Radzewicz
2013
n this article, the concept of a prototype femtosecond laser micromachining system and a femtosecond solid-state Yb:KYW laser is presented. Ultrashort laser pulses have many advantages over the long pulses in laser micromachining, due to their unique ability to interact with different materials without transferring heat to them. This allows very precise and pure laser-processing, clean cuts and sharp edges. A femtosecond laser micromachining device presented in this article is equipped with high-precision galvo scanner, quality optical elements and automatic process supporting tools, resulting in the maximum use of the femtosecond laser potential for precise micromachining and MEMS fabrication.
A Quasi-2D MOSFET Model — 2D-to-Quasi-2D Transformation
- Wiesław Kordalski
2013 Elektronika : konstrukcje, technologie, zastosowania
A quasi-two-dimensional (quasi-2D) representation of the MOSFET channel is proposed in this work. The representation lays the foundations for a quasi 2D MOSFET model. The quasi 2D model is a result of a 2D into quasi 2D transformation. The basis for the transformation are an analysis of a current density vector field and such phenomena as Gradual Channel Detachment Effect (GCDE), Channel Thickness Modulation Effect (CTME), and Lengthening Channel Effect (LCE). Basic parameters and quantities necessary for deriving quasi-2D continuity equations, quasi-2D Poisson’s equation, quasi-2D transport equation, as well as development of quasi-2D dc and small-signal models are defined.
A review of emotion recognition methods based on keystroke dynamics and mouse movements
- Agata Kołakowska
2013
The paper describes the approach based on using standard input devices, such as keyboard and mouse, as sources of data for the recognition of users’ emotional states. A number of systems applying this idea have been presented focusing on three categories of research problems, i.e. collecting and labeling training data, extracting features and training classifiers of emotions. Moreover the advantages and examples of combining standard input devices with other sources of information on human emotions have been also described. Eventually some conclusions from the review have been drawn.
A ROLE PLAYING GAME NAME GENERATOR LEARNING ITS CREATIVITY FROM ARKADIA MUD PLAYERS
- Paweł Rościszewski
2013
The paper proposes an approach to creative generation of new names for the purposes of Role Playing Games in fantasy realms. The generator based on an existing database of na mes is able to propose a set of new names with regard to demanded attributes, such as: length of the name, sex and race of the character, a given p hrase as the origin for the generated name as well as subjective evaluations from former users. The software that comes along with the article has proven its usefulness by becoming one of the most popular programs of this type one year after deploying it as a publicly available web application. The gener at or is creative, as it invents words that do not exist in the source dictionary. What is more, the ideas and algorithms described in the paper are versatile and easy to employ in numerous text generating applications.
A simple approach to heat exchanger sizing optimisation by means of entrophy generation minimisation
- Jarosław Mikielewicz
- Dariusz Mikielewicz
- Jan Wajs
2013
In the paper an attempt is presented to find the method of optimization of microtube diameter with respect to optimal thermal-hydraulic conditions in the single-phase shell-and-tube heat exchangers. The approach is based on consideration of pumping power at the condition of maximum heat transfer by the heat exchanger tube system. In the optimization method the tube diameter is first specified and then appropriate calculations are executed, showing that from the point of heat transfer the lower the diameter of the tube the better the heat transfer, however at the expense of higher pressure drop.
A simplified model of 3-D pipe system conveying flowing liquid
- Cezary Orlikowski
- Rafał Hein
2013 Solid State Phenomena
The paper presents a model reduction technique of a 3-D pipe system with flowing liquid. In the analysis and design of control (mechatronic) systems it is useful to work with simple, low order models. A hybrid reduced order model is proposed. The system model consists of two parts, the modal model and the finite element model.
A solid phase extraction–ion chromatography with conductivity detection procedure for determining cationic surfactants in surface water samples
- Ewa Olkowska
- Żaneta Polkowska
- Jacek Namieśnik
2013 TALANTA.The International Journal of Pure and Applied Analytical Chemistry
A new analytical procedure for the simultaneous determination of individual cationic surfactants (alkyl benzyl dimethyl ammonium chlorides) in surface water samples has been developed. We describe this methodology for the first time: it involves the application of solid phase extraction (SPE – for sample preparation) coupled with ion chromatography–conductivity detection (IC-CD – for the final determination). Mean recoveries of analytes between 79 % and 93 %, and overall method quantification limits in the range from 0.0018 to 0.038 μg/mL for surface water and CRM samples were achieved. The methodology was applied to the determination of individual alkyl benzyl quaternary ammonium compounds in environmental samples (reservoir water) and enables their presence in such types of waters to be confirmed. In addition, it is a simpler, less time-consuming, labour-intensive, avoiding used of toxic chloroform and significantly less expensive methodology than previously described approaches (liquid-liquid extraction coupled with liquid chromatography-mass spectrometry).
A solution of the integrated µBIST for functional and diagnostic testing in mixed-signal electronic embedded systems
- Dariusz Załęski
- Romuald Zielonko
2013
Main problem of the paper is testing of analog circuits and blocks in mixed-signal electronic embedded systems (EESs), using the built-in self-test (BIST) technique. The integrated mBIST based on reusing signal blocks already present in an EES, such as processors, memories, ADCs, is presented. The novelty of the solution is the extended functionality of the mBIST. It can perform 2 testing functions: functional testing and fault diagnosis on the level of localization of a faulty element. For functional testing, the complementary signals (CSs), and for fault diagnosis the SBT vocabulary techniques have been used.
A Strategy to Locate Fixed Points and Global Perturbations of ODE’s: Mixing Topology with Metric Conditions
- Grzegorz Graff
- Alfonso Ruiz-Herrera
2013 Pełny tekst Journal of Dynamics and Differential Equations
In this paper we discuss a topological treatment for the planar system z' = f (t, z) + g(t, z) where f and g are T -periodic in time and g(t, z) is bounded. Namely, we study the effect of g(t, z) in two different frameworks: isochronous centers and time periodic systems having subharmonics. The main tool employed in the proofs consists of a topological strategy to locate fixed points in the class of orientation preserving embedding under the condition of some recurrence properties.
A Study on Influence of Normalization Methods on Music Genre Classification Results Employing kNN Algorithms
- Aldona Rosner
- Marcin Michalak
- Bożena Kostek
2013 Pełny tekst Studia Informatica Pomerania
This paper presents a comparison of different normalization methods applied to the set of feature vectors of music pieces. Test results show the inﬂuence of min-nlax and Zero-Mean normalization methods, employing different distance functions (Euclidean, Manhattan, Chebyshev, Minkowski) as a pre-processing for genre classiﬁcation, on k-Nearest Neighbor (kNN) algorithm classification results.
A study on the interaction of rhodamine B with methylthioadenosine phosphorylase protein sourced from an Antarctic soil metagenomic library.
- Paulina Bartasun
- Hubert Cieśliński
- Anna Bujacz
- Anna Wierzbicka-Woś
- Józef Kur
2013 Pełny tekst PLOS ONE
The presented study examines the phenomenon of the fluorescence under UV light excitation (312 nm) of E. coli cells expressing a novel metagenomic-derived putative methylthioadenosine phosphorylase gene, called rsfp, grown on LB agar supplemented with a fluorescent dye rhodamine B. For this purpose, an rsfp gene was cloned and expressed in an LMG194 E. coli strain using an arabinose promoter. The resulting RSFP protein was purified and its UV-VIS absorbance spectrum and emission spectrum were assayed. Simultaneously, the same spectroscopic studies were carried out for rhodamine B in the absence or presence of RSFP protein or native E. coli proteins, respectively. The results of the spectroscopic studies suggested that the fluorescence of E. coli cells expressing rsfp gene under UV illumination is due to the interaction of rhodamine B molecules with the RSFP protein. Finally, this interaction was proved by a crystallographic study and then by site-directed mutagenesis of rsfp gene sequence. The crystal structures of RSFP apo form (1.98 A° ) and complex RSFP/RB (1.90 A° ) show a trimer of RSFP molecules located on the crystallographic six fold screw axis. The RSFP complex with rhodamine B revealed the binding site for RB, in the pocket located on the interface between symmetry related monomers.
A subset of two adherence systems, acute pro-inflammatory pap genes and invasion coding dra, fim, or sfa, increases the risk of Escherichia coli translocation to the bloodstream
- Kasjan Szemiako
- Beata Krawczyk
- Alfred Samet
- Anna Śledzińska
- Bogdan Nowicki
- Stella Nowicki
- Józef Kur
2013 Pełny tekst EUROPEAN JOURNAL OF CLINICAL MICROBIOLOGY & INFECTIOUS DISEASES
An analysis of the phylogenetic distribution and virulence genes of Escherichia coli isolates which predispose this bacteria to translocate from the urinary tract to the bloodstream is presented. One-dimensional analysis indicated that the occurrence of P fimbriae and α-hemolysin coding genes is more frequent among the E. coli which cause bacteremia. However, a two-dimensional analysis revealed that a combination of genes coding two adherence factors, namely, P + Dr, P + S, S + Dr, S + fim, and hemolysin + one adherence factor, were associated with bacteremia and, therefore, with the risk of translocation to the vascular system. The frequent and previously unrecognized co-existence of pro-inflammatory P fimbriae with the invasion promoting Dr adhesin in the same E. coli isolate may represent high-risk and potentially lethal pathogens.
A Surveillance Of Dynamic Processes in Selected Mechatronic Systems
- Krzysztof Jan Kaliński
- Marek Galewski
- Michał Mazur
2013 Pełny tekst Archive of Mechanical Engineering
The paper concerns development of original method of optimal control at energy performance index and its application to dynamic processes surveillance of some mechatronic systems. The latter concerns chatter vibration surveillance during highspeed slender milling of rigid details, as well as motion control of two-wheeled mobile platform. Results of on-line computer simulations and real performance on the target objects reflect a great efficiency of the processes surveillance.
A Test-Bed Analysis of Simultaneous PMIPv6 Handover in 802.11 WLANs Environment
- Michał Hoeft
- Józef Woźniak
2013
Providing mobility in access networks is a challenge that we have to deal with. Due to networks’ convergence and migration to all-IP networks, mobility management at the network layer is required. However, there is a need for cooperation mechanisms between the network layer and lower layers to support multimedia services and make handover more efficient. This paper presents experimental research on simultaneous handover performance in an integrated PMIPv6 and 802.11 WLAN system.
A tool for integrating Web Site services over User Interface
- Artur Opaliński
2013
Companies and organizations are building information systems by integrating previously independent applications, together with new developments. This integration process has to deal with existing applications, which can only be used through their specific interfaces, and often cannot be modified. Integration of web applications running remotely and controlled by separate organizations becomes even more complicated, as their user interface can display differently in different browsers or change without prior notification as a result of application maintenance. Web user interface is not easily processed by machine and moreover its format in public web sites is generally unstable - relatively frequently unannounced changes are introduced, which are easy to accommodate by humans, but constitute an issue for automated processing. Therefore a tool is proposed which provides for flexible interfacing application to a web site through that site's Web user interface.
A Trisection Filter Design With Negative Slope of Frequency-Dependent Crosscoupling Implemented in Substrate Integrated Waveguide (SIW)
- Łukasz Szydłowski
- Andrzej Jędrzejewski
- Michał Mrozowski
2013 IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
This letter reports on a novel realization of a microwave bandpass filter in a triplet configuration with a frequency-dependent crosscoupling implemented in substrate integrated waveguide (SIW). The design involves implementing dispersive coupling with a negative slope, a feature that allows the capabilities of the classic triplet topology to be extended. In this particular case, the implementation of two transmission zeros on the upper stopband is considered. The dispersive coupling with negative slope in SIW is achieved with a coupling with a positive slope whose sign is inverted using balanced line theory. The filter was fabricated in SIW technology, and good agreement was achieved between the simulated results and those measured.
A two-scale (FEM-DEM) approach for concrete
- Michał Nitka
- Łukasz Skarżyński
- Andrzej Tejchman-Konarzewski
2013
Artykuł omawia dwu-skalowe podejście do betonu przy wykorzystaniu modelu Mes i DEM. Metodę elementów skończonych zastosowano na poziomie makro. Na poziomie mikro zastosowano metodę elementów dyskretnych. Macierz sztywności wyznaczono na podstawie tensora naprężeń wyznaczonego w skali mikro. Wyniki numeryczne dwusalowe porównano z wynikami dyskretnymi dla całego obszaru.