2013 - Publications Repository - Gdańsk University of Technology

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Publications from the year 2013

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A la recherche d’une coherence perdue – Possible Arguments for the Non-application of EU Law in Member States
- Krystyna Kowalik-Bańczyk
2013 Polish Yearbook of International Law
The European Union (EU) is an international organization which has a broad scope of competences that have been transferred to it by its Member States in the founding Treaties. The object of the article is to identify arguments raised, or that potentially might be raised, by national Constitutional Courts (and in the future possibly by other actors as well) to exclude in certain instances the application of EU law or EU jurisprudence in the territory of a particular Member State. The three main reasons for such an exclusion might be: 1) that an action of the EU is perceived as being ultra vires; 2) that an action of the EU infringes on national identity; and 3) that an action of the EU infringes on constitutional identity. The ultra vires argument has only recently appeared in the jurisprudence of some constitutional courts, whereas the constitutional identity argument has been present since the 1970s. The national identity argument is based on a notion protected, since 1993, by the Treaty establishing the European Union. All three of these arguments are to a certain extent intermingled and their use by national actors for excluding the application of EU law is fraught with uncertainty.
A measurement system for nonlinear surface spectroscopy with an atomic force microscope during corrosion process monitoring
- Sylwia Babicz-Kiewlicz
- Artur Zieliński
- Janusz Smulko
- Kazimierz Darowicki
2013 Full text Measurement Automation Monitoring
In addition to traditional imaging the surface, atomic force microscopy (AFM) enables wide variety of additional measurements. One of them is higher harmonic imaging. In tapping mode the nonlinear contact between tip and specimen results in higher frequency vibrations. More information available from the higher harmonics analysis proves to be helpful for more detailed imaging. Such visualization is espe-cially useful for heterogeneous surfaces which are studied to understand corrosion mechanisms. In this paper the measurement system for nonlinear surface spectros-copy by AFM for corrosion processes monitoring is presented.
A method of nonlinearities of transformer no-load characteristic modelling
- Wacław Matulewicz
- Stefan Baran
2013 Full text Przegląd Elektrotechniczny
A way in which changes of the no-load characteristic are taken into account in the mathematical model of the transformer is presented. Changes of saturation within core of transformer are presented as a combined non-linear flux curve. Analysis of magnetization of the transformer core and simulation of no-load state for distribution transformer of 30 kVA power rating and 15.75/0.4 kV/kV (especially supplying VLV) transformation ratio rating were carried out.
A model, design, and implementation of an efficient multithreaded workflow execution engine with data streaming, caching, and storage constraints
- Paweł Czarnul
2013 Full text JOURNAL OF SUPERCOMPUTING
The paper proposes a model, design, and implementation of an efficient multithreaded engine for execution of distributed service-based workflows with data streaming defined on a per task basis. The implementation takes into account capacity constraints of the servers on which services are installed and the workflow data footprint if needed. Furthermore, it also considers storage space of the workflow execution engine and its cost. Caching service output data is implemented to speed up the execution of the workflow. Input data is partitioned into data packets, which are passed and processed by services previously selected for workflow tasks so that the aforementioned constraints are met. Performance impact of the proposed mechanisms is investigated for workflow structures common in acyclic directed graph workflow applications. It is shown for a real workflow with distributed processing of digital media content that the initial budget needs to be properly distributed between both the cost of services, but also the cost of intermediate storage to obtain good workflow execution times.
A multisensor detector of a sleep apnea for using at home
- Piotr Przystup
- Adam Bujnowski
- Jacek Rumiński
- Jerzy Wtorek
2013
Diagnosis of obstructive sleep apnea usually involves polysomnographic analysis, which unfortunately requires overnight stay in a specialized clinic and is very uncomfortable for a patient. This paper describes the method and apparatus for recording a set of signals to detect sleep apnea. The device records the following signals simultaneously: three-channel ECG, respiratory functions, signals from the accelerometer, and snoring sounds. Measurements are carried out during the night, in the patient's home. Algorithm for automatic analysis of the data can be used to detect sleep apnea and hypopnea.
A new approach to modeling of selected human respiratory system diseases, directed to computer simulations
- Grzegorz Redlarski
- Jacek Jaworski
2013 COMPUTERS IN BIOLOGY AND MEDICINE
This paper presents a new versatile approach to model severe human respiratory diseases via computer simulation. The proposed approach enables one to predict the time histories of various diseases via information accessible in medical publications. This knowledge is useful to bioengineers involved in the design and construction of medical devices that are employed for monitoring of respiratory condition. The approach provides the data that are crucial for testing diagnostic systems. This can be achieved without the necessity of probing the physiological details of the respiratory system as well as without identification of parameters that are based on measurement data.
A New Coupler Concept for Contactless High-Speed Data Transmission Monitoring
- Marek Zmuda
- Stanisław Szczepański
- Sławomir Kozieł
2013 Full text IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
This paper presents a new concept of a couplerthat can be applied to high-speed data transmission contactlessmeasurements. The proposed approach is dedicated for differentialsignal transmission monitoring in microstrip coupled lineson printed circuit boards (PCBs). The coupler, produced on aseparate PCB, is overlayed on the transmission line with thedifferential signal and delivers decoupled differential signal tothe main measurement path. The main advantage of this solutionis that no dedicated connectors are required for the measurementprocess, which results in product cost reduction and designsimplification. The complete design methodology of the proposedcoupler has been described. Theoretical considerations have beenconfirmed by the example coupler prototype that was fabricatedand measured. The measurement results show that the proposedconcept may be advantageous for contactless signal monitoring inwidely used high-speed interconnections realized on cheap FR-4PCBs.
A new division of bacterial UvrA homologues
- Marta Marszałkowska
- Marcin Olszewski
- Magdalena Bil
- Łukasz Kreft
2013 Full text BioTechnologia
The UvrA protein is a DNA-binding and damage-recognition enzyme which participates in the prokaryotic type nucleotide excision repair (NER) pathway. It has recently been noted that some bacterial genomes comprise additional uvrA genes which encode five distinct types of UvrA homologue. We investigated the sequences of over 2400 bacterial genomes and found 130 examples of bacteria containing uvrA 2 genes. The sequence analyses conducted on these UvrA homologues revealed that the previously established division of UvrA proteins might be based on some incorrect assumptions. In this paper, we present the reasons for our creation of a new division of UvrA homologues and a description of the four UvrA classes we have created.
A new duty cycles calculation method in pulse width modulation for direct matrix converters based on the shape function concept
- Paweł Szczepankowski
2013
Paper presents a new approach to duty cycle calculation in pulse width modulation for direct matrix converters. The essence of the proposed method is the use of elementary shape function of finite element. The algorithm for calculating the duty cycles was reduced to simple operations on the coordinates of input and output voltage vectors without trigonometric functions.
A new method for measuring the psychoacoustical properties of tinnitus
- Bożena Kostek
- Tomasz Poremski
2013 Full text Diagnostic Pathology
information, select the tinnitus treatment and quantitatively substantiate its effects, the measurement of the Tinnitus psychoacoustic parameters should be made an inherent part of the Tinnitus therapy. Methods For this purpose the multimedia-based sound synthesizer has been proposed for testing tinnitus and the results obtained this way are compared with the outcome of the audiometer-based Wilcoxon test. The method has been verified with 14 patients suffering from tinnitus. Results The experiments reveal capabilities, limitations, advantages and disadvantages of both methods. The synthesizer enables the patient to estimate his/her tinnitus more than twice as fast as the audiometer and makes the information on the tinnitus character perception more accurate. The analysis of the Wilcoxon test results shows that there are statistically important differences between the two tests. Conclusions Patients using the synthesizer operate the software application themselves and thus get more involved in testing. Moreover, they do not concentrate on describing verbally their tinnitus, which could be difficult for some of them. As a result, the test outcome is closer to the perceived tinnitus. However, the more complex
A New Three-Dimensional Space Vector Modulation for Multilevel Four-Leg Converters Based on the Shape Functions of Tetrahedral Element
- Paweł Szczepankowski
- Janusz Nieznański
- Wojciech Śleszyński
2013
The paper proposes a new three-dimensional space vector pulse-width modulation (3D-SVPWM) algorithm for multilevel four-leg converters. The proposed PWM duty cycle calculation is based on the shape functions of the threedimensional tetrahedral finite elements. The algorithm ensures synthesis of accurate and undistorted output voltages even under significant imbalance or ripple in the DC-link voltages. At the same time, the algorithm has the ability to eliminate the possible imbalance in the DC-link voltages.
A nine-input 1.25 mW, 34 ns CMOS analog median filter for image processing in real time
- Waldemar Jendernalik
- Grzegorz Blakiewicz
- Jacek Jakusz
- Stanisław Szczepański
2013 Full text ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING
In this paper an analog voltage-mode median filter, which operates on a 3 × 3 kernel is presented. The filter is implemented in a 0.35 μm CMOS technology. The proposed solution is based on voltage comparators and a bubble sort configuration. As a result, a fast (34 ns) time response with low power consumption (1.25 mW for 3.3 V) is achieved. The key advantage of the configuration is relatively high accuracy of signal processing, which allows the calculation of the median of signals with the difference in amplitude as small as 10 mV. This feature allows the application of the filter to vision systems with up to 7 bit equivalent resolution. The analytical and statistical analysis of the filter resolution, and analysis of its speed limitations are presented and compared to measurement results. Based on the achieved results, a set of guidelines for the filter design and optimisation is presented.
A Novel Approach to the Assessment of Cough Incidence
- Bartosz Różański
- Bartosz Król
- Marcin Ciołek
2013
In this paper we consider the problem of identication of cough events in patients suffering from chronic respiratory diseases. The information about frequency of cough events is necessary to medical treatment. The proposed approach is based on bidirectional processing of a measured vibration signal - cough events are localized by combining the results of forward-time and backward-time analysis. The signal is at rst transformed using Daub4 wavelet in order to map it to its rst trend subsignal and rst uctuation subsignal. This enables us to localize cough events in the uctuation subsignal by tracking its instantaneous variance. The proposed approach allows to distinguish between cough and cough-like episodes (scream, speech etc). It is validated using recorded data including 271 events, both cough and non-cough events. 98% sensitivity, and 90% specicity were obtained.
A Novel Coupling Matrix Synthesis Technique for Generalized Chebyshev Filters With Resonant Source–Load Connection
- Łukasz Szydłowski
- Adam Lamęcki
- Michał Mrozowski
2013 IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
This paper reports a novel synthesis method for microwave bandpass filters with resonant source–load connection. In effect, a network realizing N+1 transmission zeros (where N is the number of reflection zeros) is obtained. The method is based on a prototype transversal coupling matrix (N+2, N+2) with source and load connected by a resonant circuit formed by a capacitor in parallel with a frequency-invariant susceptance. To complement the proposed synthesis technique, a method of reconfiguring the transversal coupling matrix as a more practical cross-coupled circuit is outlined. The technique is based on quickly converging gradient optimization with a cost function involving generalized eigenvalues of the transversal coupling matrix and its principal upper and lower submatrices. To illustrate and validate the proposed synthesis procedure, numerical tests have been carried out. Moreover, some aspects of implementation of the resonant connection between source and load were investigated, and experimental verification was performed. A third-order generalized Chebyshev filter with four transmission zeros was designed, fabricated, and tested. The measured results validate the proposed synthesis method.
A novel method for archiving multibeam sonar data with emphasis on efficient record size reduction and storage
- Marek Moszyński
- Andrzej Chybicki
- Marcin Kulawiak
- Zbigniew Łubniewski
2013 Full text Polish Maritime Research
Over the past few years considerable advances in sonar technology, spatial positioning capabilities and computer processing power have lead to signiﬁcant improvements in mapping, imaging and technologies of seaﬂoor exploration. Recently, modern multibeam echosounder systems (MBES) capable of recording backscatter data for the whole water column, not just for the seabed, have become available thus providing data allowing for visualization and analysis of objects other than the seabed such as single ﬁsh, ﬁsh schools or pollution. Unlike bathymetric sonars, which only capture the seaﬂoor, multibeam systems produce very large amounts of data during surveys. Because of this, storing the data collected during hydrographic or scientiﬁc cruises becomes a crucial problem. In this context, the paper proposes a new approach for efﬁcient reduction and storage of MBES records. The results of a sample implementation of the algorithm being tested on several different sets of MBES data are also discussed.
A novel method of local chirp-rate estimation of LFM chirp signals in the time-frequency domain
- Krzysztof Czarnecki
- Marek Moszyński
2013
In the paper, novel dynamic representations of a complex signal in the time-frequency domain are introduced. The proposed approach is based on using the gradient of the short-time Fourier transform complex phase. A channelized instantaneous complex frequency (CICF) and a complex local group delay (CLGD) are included in the presented signal representations. An application of the newly-introduced distributions is demonstrated by a local chirp-rate estimation of linear frequency modulated chirp signals in the time-frequency domain.
A novel method of time-frequency analysis: an essential spectrogram
- Krzysztof Czarnecki
2013 Full text HYDROACOUSTICS
A novel precise method of time-frequency analysis is presented. In the algorithm, a new energy distribution is estimated by simultaneously discard or displacement of the classical spec- trogram energy. A channelized instantaneous frequency and a local group delay are used in order to replacement in the same manner as formulated by Kodera et al. [1, 2]. Additionally, new representations: a channelized instantaneous bandwidth and a local group duration are used in order to remove some part of irrelevant energy. A newly obtained energy distribution called essential spectrogram is highly concentrated and signal mono-components are precisely localized in the time-frequency domain.
A novel methodology for the enantiomeric resolution of methamphetamine, its precursors and intermediates by GC-MS
- Justyna Płotka-Wasylka
- Calum Morrison
- Marek Biziuk
2013
Impurity profiling and classification of abused drugs using chiral analytical techniques is of particular interest and importance because of the additional information obtained from this approach. When these methods are applied to the synthesis of illicitly used substances, they can supply valuable information about the conditions/chemicals used in the synthesis. In this study, simultaneous chiral separation of methylamphetamine, its common precursors and intermediates using gas chromatography-mass spectrometry (GC-MS) was carried out using fluorinated acid anhydrides as chemical derivatization reagents prior to gas chromatographic analysis on a 2,6-di-O-pentyl-3-propionyl silyl-γ-cyclodextrin stationary phase (CHIRALDEX G-PN). The method is able to separate all 10 enantiomers of interest with good qualitative precision under condition of repeatability and reproducibility. Detection by MS allows for the identity of analytes to be confirmed in the single analysis which is of particular interest to the forensic analysis.
A Novel Synthesis Technique for Microwave Bandpass Filters with Frequency-Dependent Couplings
- Natalia Leszczynska
- Łukasz Szydłowski
- Michał Mrozowski
2013 Progress in Electromagnetics Research-PIER
This paper presents a novel synthesis technique for microwave bandpass filters with frequency-dependent couplings. The proposed method is based on the systematic extraction of a dispersive coupling coefficient using an optimization technique based on the zeros and poles of scattering parameters representing two coupled resonators.The application of this method of synthesis is illustrated using two examples involving four and five-pole generalized Chebyshev filters implemented in substrate-integrated waveguide (SIW) technology.As a dispersive inverter, a parallel shorted stub with an additional septum was used. The septum lends greater flexibility to the dimensional synthesis, in that it increases the allowable range of the coupling coefficients. The measured and simulated results are in excellent agreement, which confirms the validity of the proposed approach.
A Numerical Model Study on Ice Boom in a Coastal Lake
- Tomasz Kolerski
- Hung Tao Shen
- Shinji Kioka
2013 JOURNAL OF COASTAL RESEARCH
A numerical study on the effectiveness of the proposed ice boom to be installed near the entrance of Lake Notoro, Hokkaido, Japan to prevent sea ice moving into the lake is presented. A two-dimensional hydro–ice dynamics model was modified to allow for the treatment of ice-boom interaction with the effect of tidal current. The numerical model is a coupled hydrodynamic and ice dynamic model. The ice dynamic component uses a Lagrangian discrete parcel method based on smoothed particle hydrodynamics. The model was used to assess the dynamics of sea-ice transport into the lake, the effectiveness of the boom on ice retention, and the ice load on boom spans. Results for steady and unsteady simulation cases including wind effect are presented.