2016 - Repozytorium publikacji - Politechnika Gdańska

Pokaż publikacje z roku

Publikacje z roku 2016

Pokaż wszystkie

Comparison of perforator location in dynamic and static thermographic imaging with Doppler ultrasound in breast reconstruction surgery
- Szymon Kołacz
- Mateusz Moderhak
- Jerzy Jankau
2016
This paper co mpares the effectiveness of the dTnorm and t90_10 parametrizations in dynamic thermography for imaging location of perforators in TRAM flaps in the intraoperative period. The results were compared with the location detected in a Doppler ultrasound examination. Cold and heat stimulation was used in dynamic thermography. Additionally, these results were compared with static thermograph y. The study was conducted on a group of 10 female patients after breast reconstruction.
Comparison of selected off-the-shelf solutions for emotion recognition based on facial expressions
- Grzegorz Brodny
- Agata Kołakowska
- Agnieszka Landowska
- Mariusz Szwoch
- Wioleta Szwoch
- Michał Wróbel
2016
The paper concerns accuracy of emotion recognition from facial expressions. As there are a couple of ready off-the-shelf solutions available in the market today, this study aims at practical evaluation of selected solutions in order to provide some insight into what potential buyers might expect. Two solutions were compared: FaceReader by Noldus and Xpress Engine by QuantumLab. The performed evaluation revealed that the recognition accuracies differ for photo and video input data and therefore solutions should be matched to the specificity of the application domain.
Comparison of simplified sum-over-state expressions to calculate resonance Raman intensities including Franck-Condon and Herzberg-Teller effects
- Julien Guthmuller
2016 Pełny tekst JOURNAL OF CHEMICAL PHYSICS
Sum-over-state (SOS) expressions to simulate absorption spectroscopy and resonance Raman (RR) scattering including Franck-Condon (FC) and Herzberg-Teller (HT) effects are described. Starting from the general SOS method, several simplified SOS formulae are derived. In particular, within the so-called independent mode displaced harmonic oscillator model, it is shown that including the vibronic structure in the absorption and RR spectra only requires the calculation of FC overlap integrals of the type ⟨θ g0 |θ ev ⟩ θg0|θev , where g, e, and v stand for the electronic ground state, excited state, and vibrational quantum number, respectively. Additionally, an approximation of the latter approach is introduced, referred as the simplified Φe method, in which the FC factors are neglected. This method is advantageous from the computational point of view and it is demonstrated that it reproduces the main characteristics of the more involved approaches. The merits and drawbacks of the different methods are discussed by applying them to the prototypical compound of Rhodamine 6G. Overall, this work intends to unravel and clarify some differences in the SOS theories of RR scattering.
Comparison of strain results at a laser weld notch obtained by numerical calculations and experimental measurements
- Karol Niklas
- Janusz Kozak
2016 Pełny tekst AIP Conference Proceedings
In the development of ship structures applying new materials and it’s purposeful placement play an important role. During the last years, especially in a construction of ro-ro type vessels, the usage of novel sandwich structures in cargo decks is profitable. Steel sandwich panel is an innovative solution which at a todays state of development can be used for the construction of any members not taking part in a global bending of a hull. The one important reason for this is a lack of knowledge and experience in the fatigue assessment. The problem of fatigue assessment of the steel sandwich structures arises from no typical welds connecting its structural components. The joints are fabricated by the use of laser welding technique, or hybrid welding. Standard methodology for the fatigue analysis is local stress approach or local strain approach. In both methods the crucial aspect is determination of a maximum values of strains and stresses. The most effective technique to designate these values is numerical modelling with the use of Finite Element Method or Boundary Element Method. In this paper the comparison of local stresses at a weld notch obtained by two independent methods is presented. The results calculated by the Finite Element Analysis are being compared with the experimental one measured by the use of laser extensometer grid technique. The goal of this comparison is verification of the main numerical modelling assumptions.
Comparison of the coordination geometries of Zn(II) and Cd(II) ions in complexes with water, methanol and bulky aryloxysilanethiolate ligands
- Agnieszka Jabłońska
- Johannes Bender
- Dietrich Gudat
- Łukasz Ponikiewski
- Anna Dołęga
2016 POLYHEDRON
Zinc and cadmium complexes containing silanethiolate anions and methanol or water were synthesized and characterized by X-ray diffraction, FT-IR and NMR spectroscopy, and DFT calculations. Contrary to zinc, the cadmium ion utilizes very weak donors to complete its coordination sphere; it forms contacts to phenyl rings of the silanethiolate ligand. Two zinc analogs of the general formula [Zn{SSi(OAr)3}2(L)2] where L = CH3OH (2) or H2O (3) are compared. In 3, methanol is replaced by water even at low concentration of water in the reaction mixture. The exchange is accompanied by the reorganization of the hydrophobic environment of the water/methanol ligand in the complex. A tetranuclear zinc complex Zn4(CH3OH)4{SSi(OAr)3}4(CH3COO)4] 4 featuring an unusual unsupported [Zn4(CH3COO)4]4+ core was also obtained and characterized.
Comparison of the measurement techniques employed for evaluation of ambient air odour quality
- Wojciech Wojnowski
- Tomasz Majchrzak
- Jacek Gębicki
- Tomasz Dymerski
- Jacek Namieśnik
2016
The paper presents the results of investigation on ambient air odour quality in a vicinity of the industrial sewage treatment plant being a part of the crude oil processing plant. The investigation was performed during spring-winter season using a prototype of electronic nose and the Nasal Ranger field olfactometers. The prototype was equipped with a set of six semiconductor sensors by FIGARO Co. and one PID-type sensor. The field olfactometers were used to determine mean concentration of odorants, which amounted from 2.2 to 20.2 ou/m3 depending on the place of measurement. In case of the investigation with the electronic nose prototype a classification of the ambient air samples with respect to the place of sampling was performed utilizing the kNN (where k=3) algorithm supported with a cross-validation method. Correct classification of the ambient air samples was at the level of 47.9%. Performed investigation revealed that evaluation of the ambient air samples with respect to odour was possible using the electronic nose instrument.
Comparison of the Measurement Techniques Employed for Evaluation of Ambient Air Odour Quality Influenced by Operation of Industrial Sewage Treatment Plant
- Paulina Lewkowska
- Hubert Byliński
- Wojciech Wojnowski
- Tomasz Dymerski
- Jacek Gębicki
- Jacek Namieśnik
2016 CHEMICAL ENGINEERING TRANSACTIONS
The paper presents the results of investigation on ambient air quality evaluation with respect to concentration of odorants in a vicinity of a sewage treatment plant of the LOTOS Group S.A. petroleum plant. The investigation was performed during winter season using a prototype of electronic nose and the Nasal Ranger field olfactometers. The prototype was equipped with a set of six semiconductor sensors by FIGARO Co. and one PID-type sensor. The field olfactometers were used to determine mean concentration of odorants, which amounted from 2.2 to 17.8 ou/m3 depending on the place of measurement. In case of the investigations with the electronic nose prototype a classification of the ambient air samples with respect to the place of sampling was performed utilizing linear discriminant function supported with a cross-validation method. Correct classification of the ambient air samples was at the level of 83.3%. Moreover, it was shown that discrimination of the ambient air samples differing in concentration of odorants and place of origin was possible with the electronic nose measurements.
Comparison of Transmission Capacities of Two Regulation Systems: Lateral and in-phase Control Transformers
- Marcin Sarnicki
- Ryszard Zajczyk
- Bartosz Tarakan
- Krzysztof Tarakan
2016 Pełny tekst Acta Energetica
This paper presents a comparison of regulation capabilities of lateral and in-phase control transformers in a selected node of a power system. Their regulation capabilities are presented, as well as cross-system exchange options.
Comparison of Two Nonlinear Predictive Control Algorithms for Dissolved Oxygen Tracking Problem at WWTP
- Robert Piotrowski
2016 Pełny tekst Journal of Automation, Mobile Robotics and Intelligent Systems - JAMRIS
The wastewater treatment plant is classified as a complex system, due to its nonlinear dynamics, large uncertainty of disturbance inputs, multiple time scales in the internal process dynamics, and multivariable structure. The aeration process, in turn, is an important and expensive part of wastewater treatment plant operation. All operating parameters of the aeration in biological processes are to be precisely controlled to provide adequate biological conditions for microorganisms. Therefore the most important issue of the biological process is to operate it in such a way that a minimal energy is consumed and minimal DO concentration demand is applied. The paper proposes two advanced control systems to track the dissolved oxygen reference trajectory. The decentralized algorithm and the multivariable nonlinear predictive control algorithm are designed and compared. Simulation tests for the wastewater treatment plant case study are presented.
Completeness and Consistency of the System Requirement Specification
- Jarosław Kuchta
2016 Pełny tekst Annals of Computer Science and Information Systems
Although the System Requirement Speciﬁcation, as a ﬁrst formal and detailed document, is the base for the software project in classic software methodologies, there is a noticeable problem of assuring the completeness of this document. The lack of its completeness causes uncertainty of the project foundations. This was one of motivations for agile methodologies – if the SRS cannot be easily validated, if it can change in late project phases, then get rid of the SRS. Replace formal requirements with user stories. However user stories are also requirements mostly functional requirements. As agile methodologies focus on functional requirements, it is easy to forget quality requirements. In this paper we show the impact of quality requirements analysis on functional requirements exploration. Although in our experiment we noticed considerable large functional requirements increment, we went further and examined the impact of SRS consistency on its completeness. The research has shown that the increment of the revealed requirements count may be almost three times greater, compared to the standard requirement speciﬁcation method.
Complexity analysis of the Pawlak’s flowgraph extension for re-identification in multi-camera surveillance system
- Karol Lisowski
- Andrzej Czyżewski
2016 MULTIMEDIA TOOLS AND APPLICATIONS
The idea of Pawlak’s flowgraph turned out to be a useful and convenient container for a knowledge of objects’ behaviour and movements within the area observed with a multi-camera surveillance system. Utilization of the flowgraph for modelling behaviour admittedly requires certain extensions and enhancements, but it allows for combining many rules into a one data structure and for obtaining parameters describing how objects tend to move through the supervised area. The main aim of this article is presentation of the complexity analysis of proposed modification of flowgraphs. This analysis contains considerations of issues such as memory efficiency and computational complexity of operations on the flowgraph. The measures related to space and time efficiency were also included.
COMPLEXITY OF INNOVATIVE FINANCIAL PRODUCTS: THE CASE OF SYNTHETIC EXCHANGE TRADED FUNDS IN EUROPE
- Adam Marszk
2016 Pełny tekst Nauki o Finansach. Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu
The aim of the text is the presentation of the most important categories of exchange traded funds (ETFs) – physical and synthetic ones. A theoretical part of the text includes an overview of the main features of ETFs, the presentation of differences between physical and synthetic funds and the main risks posed by both types to their users and the whole financial systems. An empirical part focuses on the European market. Time span of the analysis are years 2001-2015 (or shorter periods in case of lack of sufficient data). Using key statistics regarding the European ETFs market, its size, structure (both historically and currently) as well as predictions of the main future changes are discussed. The main results of the research indicate that the size of the European ETFs market, both in terms of the assets under management and number of listed funds, has been growing in the recent years, yet at the rate lower than before the global financial crisis. An important observed change on the European ETFs market is the declining share of synthetic ETFs after their peak popularity in 2010. The most recent data, from the first months of 2015, confirm this trend. Considering the data on cash flows into these two categories, physical ETFs will most probably continue to increase their market share in comparison to synthetic ones.
COMPOSITION OF BIOACTIVE SECONDARY METABOLITES AND MUTAGENICITY OF SAMBUCUS NIGRA L. FRUIT AT DIFFERENT STAGES OF RIPENESS
- Izabela Koss-Mikołajczyk
- Anna Lewandowska
- Tadeusz Pilipczuk
- Barbara Kusznierewicz
- Agnieszka Bartoszek-Pączkowska
2016 Pełny tekst Acta Alimentaria
The relationship between the content of bioactive compounds and mutagenic activity of elderberry fruit at different stages of ripeness was investigated. Signifi cant differences in the antioxidant profi les (TLC, HPLC with post-column derivatization) and antioxidant activity (ABTS, DPPH, and FC tests) were observed for studied elderberry extracts. The more ripen the fruit at the time of harvest were, the higher the content of anthocyanins (increase from 0 to 7.8 mg g–1d.w.) and antioxidant activity of the extracts (about 5-fold increase) were. Cyanogenic glycosides were not detected at any stage of ripeness. Accordingly, Ames MPF test (Xenometrix) did not reveal any mutagenicity. Our study suggests that instability of cyanogenic glycosides ensures safety of food/pharmaceutical products based on even not fully ripen elderberry fruit.
Comprehensive Comparison of a Few Variants of Cluster Analysis as Data Mining Tool in Supporting Environmental Management
- Aleksander Astel
- Karolina Astel
- Stefan Tsakovski
- Marek Biziuk
- Krystian Obolewski
- Katarzyna Glińska-Lewczuk
- Katarzyna Bigus
- Ioan Craciun
- Cristina Maria Timofte
2016 Environmental Engineering and Management Journal
A few variants of hierarchical cluster analysis (CA) as tool of assessment of multidimensional similarity in environmental dataset are compared. The dataset consisted of analytical results of determination of metals (Na, K, Ca, Sc, Fe, Co, Zn, As, Br, Rb, Mo, Sb, Cs, Ba, La, Ce, Sm, Hf and Th) in ambient air dried and kept alive, by the means of hydroponics, moss baskets collected in 12 locations on the area of Tricity (Poland). The selected urban locations covered sites of various anthropogenic impact (cargo transit, heavy traffic, apartments, shipyard, etc.). Factor analysis in the variant of Principal Component Analysis (PCA) is offered as a validating method for CA. The results of three scaling variants are presented: column scaling, row scaling and column scaling followed by row scaling. Moreover, the results of two linkage methods with squared Euclidean distance as the similarity measure are compared: Ward’s linkage and complete linkage. The cluster significance is indicated basing on Sneath’s index. Some urban pollution profiles (fertilizer plant emission, fossil fuel burning, municipal waste dump, mineral soil dust) were identified and the possibility of their application by the environmental decision makers or managers is pointed out. The complete environmental data exploration procedure is recommended.
COMPREHENSIVE MODELLING OF THE COST EFFECTIVNESS OF RAILWAY LINE ELECTRIFICATION
- Maksymilian Tomczyk
- Michał Pacholczyk
- Krzysztof Karwowski
2016 Pełny tekst Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Subject of this paper is the mathematical model estimating the Economical threshold between usage of combustion engine traction and electrical traction for new and modernized railway passenger communication lines. Currently available models do not coincide with the whole complexity of the problem. The proposed model was implemented into Matlab and then validated on “Pomorska Kolej Metropolitalna” investment time-frame and its cost of infrastructure, type of Diesel Multiple Units (DMU) and track geometry. The vehicles maintenance levels are taken into consideration as well. Usage of the Energy Storage Systems is considered. The final result of this analysis is threshold of economic efficiency in analyzed period of 30 years for traffic flow expressed in value of passenger per hour in rush hours.
Comprehensive two dimensional gas chromatography coupled with mass spectrometry as tool for characterization of the main pollutants present in atmospheric air in Gdansk
- Katarzyna Zwolak
- Monika Synakiewicz
- Hubert Byliński
- Jacek Gębicki
- Tomasz Dymerski
- Jacek Namieśnik
2016
Nowadays, the technique that is commonly used to identify and quantify the chemical compounds in gas sample is gas chromatography. The separation resolution in gas chromatography can be improved by applying the modulation technique. In this paper present is the most important information regarding the pollutants present in atmospheric air. The areas in which the tests were carried out are one of the largest industrial zones in Gdansk. The research was aimed at identifying the most common chemical compounds. The Comprehensive Two Dimensional Gas Chromatography with Time-Of-Flight Mass Spectrometry (GCxGC-TOFMS) technique was applied for the analysis of volatile organic compounds in samples of atmospheric air. Field studies were conducted from March to May 2016.
Computational Approaches to Modeling Artificial Emotion – An Overview of the Proposed Solutions
- Zdzisław Kowalczuk
- Michał Czubenko
2016 Pełny tekst FRONTIERS IN ROBOTICS AND AI
Cybernetic approach to modeling artificial emotion through the use of different theories of psychology is considered in this paper, presenting a review of twelve proposed solutions: ActAffAct, FLAME, EMA, ParleE, FearNot!, FAtiMA, WASABI, Cathexis, KARO, MAMID, FCM, and xEmotion. The main motivation for this study is founded on the hypothesis that emotions can play a definite utility role of scheduling variables in the construction of intelligent autonomous systems, agents and mobile robots. In this review we also include an innovative and panoptical, comprehensive system, referred to as the Intelligent System of Decision-making (ISD), which has been employed in practical applications of various autonomous units, and which applies as its part the xEmotion, taking into consideration the personal aspects of emotions, affects (short term emotions) and mood (principally, long term emotions).
Computationally Efficient Design Optimization of Compact Microwave and Antenna Structures
- Slawomir Koziel
- Piotr Kurgan
- Adrian Bekasiewicz
2016
Miniaturization is one of the important concerns of contemporary wireless communication systems, especially regarding their passive microwave components, such as filters, couplers, power dividers, etc., as well as antennas. It is also very challenging, because adequate performance evaluation of such components requires full-wave electromagnetic (EM) simulation, which is computationally expensive. Although high-fidelity EM analysis is not a problem for design verification, it becomes a serious bottleneck when it comes to automated design optimization. Conventional optimization algorithms (both gradient-based and derivative-free ones such as genetic algorithms) normally require large number of simulations of the structure under design, which may be prohibitive. Considerable design speedup can be achieved by means of surrogate-based optimization (SBO) where a direct handling of the expensive high-fidelity model is replaced by iterative construction and re-optimization of its faster representation, a surrogate model. In this chapter, we review some of the recent advances and applications of SBO techniques for the design of compact microwave and antenna structures. Most of these methods are tailored for a design problem at hand, and attempt to utilize its particular aspects such as a possibility of decomposing the structure. Each of the methods exploits an underlying low-fidelity model, which might be an equivalent circuit, coarse-discretization EM simulation data, and approximation model, or a combination of the above. The common feature of the presented techniques is that a final design can be obtained at the cost of a few evaluations of the high-fidelity EM-simulated model of the optimized structure.
Computer-aided analysis of resonance risk in power system with Static Var Compensators
- Robert Kowalak
- Robert Małkowski
- Stanisław Czapp
- Jacek Klucznik
- Zbigniew Lubośny
- Krzysztof Dobrzyński
2016 Pełny tekst Przegląd Elektrotechniczny
Static Var Compensators operation in a power system may significantly improve voltage profiles in nodes and the reactive power balance, as well as ensure greater system stability in emergency conditions. However these devices may be a cause of a resonance in the system. The aim of this paper is to call attention to the need to include resonance phenomena in a compensator’s location evaluation process. The analysis performed in the paper indicates the factors which affect a circuit’s resonance conditions, including a change in network configuration and compensator’s structure.
Computer-aided analysis of signals from a low-coherence Fabry-Perot interferometer used for measurements of biological samples
- Marcin Mrotek
- Jerzy Pluciński
- Małgorzata Szczerska
2016 Pełny tekst
The aim of the study was to develop an automated computer-aided system for analysis of spectrograms obtained from measurements of biological samples performed with a low-coherence Fabry-Pérot interferometer. Information necessary to determine dispersion characteristics of measured materials can be calculated from the positions of the maxima and minima that are present in their spectra. The main challenge faced during the development of the system was reliable detection of these maxima and minima in the presence of noise, without requiring substantial user interaction, and with an acceptable computational complexity.