2013 - Publications Repository - Gdańsk University of Technology

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Publications from the year 2013

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Implementation of Business Intelligence in an IT organization - the concept of an evaluation model
- Tomasz Sitek
- Michał Litka
2013 Full text Foundations of Management
This paper presents the issue of assessing the validity and effectiveness of implementing a Business Intelligence system in an IT Support Organization. This entity provides IT services to external clients involving, in particular, the storage and processing of large amounts of data. The vast amount of realized projects and also incidents reported in connection with those projects prevented effective decisions from being made without the support of dedicated technologies. The authors present the problems encountered by the studied entity and describe the tool which was selected to improve the situation. The aim of the study was to measure and describe the key processes in the organization on the basis of prepared aggregated measures, first prior to the implementation of the BI system and then a year after its implementation. The evaluation model developed by the authors allowed the assessment of the key aspects of the company's operation over two years. It thus helped decision makers to establish whether the decision to implement the Business Intelligence system was correct or not.
Implementation of Contemporary Technologies in Naval Sonars Modernization
- Jacek Marszal
2013 Full text HYDROACOUSTICS
Today’s fast technological advancement in electronics and signal processing methods makes electronic systems, including sonars, obsolete very quickly. The Polish Navy seems to be particularly affected as its ships were built in the 1970s and 1980s. Researchers at the Gdansk University of Technology have developed a methodology for modernising Navy sonars which involves the use of new electronic sub-systems and modern, bespoke methods of digital signal processing. Thanks to that, the existing large and expensive ultrasonic transducers and their systems for deployment and stabilisation remain unchanged. Between 2001 and 2013 this methodology was used by the Gdansk University of Technology to modernise 26 sonars of different types for the Polish Navy. The projects have significantly improved the technical and utility parameters of the sonars, while keeping the expenditure at about 20% of the value of new equipment.
Implementation of FDTD-compatible Green's function on heterogeneous CPU-GPU parallel processing system
- Tomasz Stefański
2013 Progress in Electromagnetics Research-PIER
This paper presents an implementation of the FDTD-compatible Green's function on a heterogeneous parallel processing system. The developed implementation simultaneously utilizes computational power of the central processing unit (CPU) and the graphics processing unit (GPU) to the computational tasks best suited to each architecture. Recently, closed-form expression for this discrete Green's function (DGF) was derived, which facilitates its applications in the FDTD simulations of radiation and scattering problems. Unfortunately, implementation of the new DGF formula in software requires a multiple precision arithmetic and may cause long runtimes. Therefore, an acceleration of the DGF computations on a CPU-GPU heterogeneous parallel processing system was developed using the multiple precision arithmetic and the OpenMP and CUDA parallel programming interfaces. The method avoids drawbacks of the CPU- and GPU-only accelerated implementations of the DGF, i.e. long runtime on the CPU and significant overhead of the GPU initialization respectively for long and short lengths of the DGF waveform. As a result, the seven-fold speedup was obtained relative to the reference DGF implementation on a multicore CPU thus applicability of the DGF in FDTD simulations was significantly improved.
Implementation of the Boundary Element Method to Two-Dimensional Heat Transfer with Thermal Bridge Effects
- Michał Lewandowski
2013 Full text TASK Quarterly
The work presents an application of the boundary element method applied to a two-dimensional conductive heat transfer. The algorithm of the method is explained and its advantages are outlined. Green's function as a fundamental solution for Poisson's equation in two dimensions was used and the direct approach was applied. The presented results concern building construction elements as typical cases of thermal bridges. Some properties of the boundary element method which give new possibilities were considered. For instance, forcing selected values of temperature on inner edges of the considered domain or local increasing of the temperature field resolution. The simulations were performed with the author's own algorithm.
Implementation of the digital receiver in multibeam long-range sonar
- Jan Schmidt
- Aleksander Schmidt
2013 Full text HYDROACOUSTICS
The article presents the implementation of a digital receiver in multibeam long - range sonar. Developed by the authors of the article, the implementation was part of sonar modernisation on large Polish Navy ships. The article explains the structure of the receiver, its design details and requirements affecting the architecture. The technical solutions regarding the equipment and signal processing algorithms for determining receiving beams for the active and passive mode are discussed. Key to the receiver design is the signal processing module responsible for determining the multibeam spatial filter (beamformer). Aspects of modern data transmission as used in the device a re also discussed.
Implementing a CSR Strategy in a Small Enterprise - a Case Study
- Piotr Grudowski
- Piotr Walentynowicz
2013
As a result of employees’ meetings conducted according to Kaizen workshops formula and seeking new development directions for the company (including CSR actions) various product and service innovations have been implemented. Also a market niche has been discovered, and as a consequence the company gained another profitable aspect of the business activity. The atmosphere and contribution in performing tasks have improved among employees. As the current office space appeared to be too small, ”X” company is planning to move to a new place with better location. It is evident that ultimately the company has strengthened its competitive position and its perspectives are optimistic. Therefore it is worth to implement CSR idea and modern attitude towards employees (kaizen) not only in large but also in small enterprises. Finally, it needs to be underlined that it all would not have been possible, if CSR strategy had been a set of complex procedures and expanded regulations instead of coming straight from hearts and minds of the company management and employees. It is a key factor to achieve success in implementing CSR, particularly in small enterprises.
Implementing fuzzy logic to generate user profile in decisional DNA television: the concept and initial case study
- Haoxi Zhang
- Cesar Sanin
- Edward Szczerbicki
2013 CYBERNETICS AND SYSTEMS
In the paper the concept and case study of a novel approach that generates a television user's profile utilizing principles of fuzzy logic is presented.
Implementing second-order CFA model for the factorial validity of brand equity
- Bruno Schivinski
2013
The purpose of this study was to test the implementation of a second-order CFA model for the factorial validity of Aaker’s consumer-based brand equity framework. To test the proposed theoretical model 186 data sets generated through a standardized onlinesurvey were evaluated. The data wasanalyzedusing structural equation modeling with AMOS 21.0 software. The results demonstrated that the higher order CFA model for consumer-based brand equity did not have an acceptable goodness-of-fit. This study also offers suggestions for further research inthe field of brand equity management.
Improvement of electrochemical action of zinc-rich paints by addition of nanoparticulate zinc
- Andrzej Miszczyk
- Katarzyna Schaefer
2013 CORROSION SCIENCE
The influence of nanosized particles on electrochemical action of standard zinc-rich paints by means of SEM as well as potential and impedance measurements has been investigated. The motivation for doing this was to obtain additional electrical connection between the spherical microparticles themselves and zinc particles and steel substrate. Overall zinc content was at the level of 92% by weight. Samples with different concentration of nanoparticulate zinc (0%, 5%, 10% and 40%) were tested. Addition of 5–10% nanoparticulates extended the galvanic action of the coating in comparison to the standard zinc-rich coating.
Improvement of Imperfect String Matching Based on Asymetric n-Grams
- Julian Szymański
- Tomasz Maria Boiński
2013 Full text
Typical approaches to string comparing treats them as either different or identical without taking into account the possibility of misspelling of the word. In this article we present an approach we used for improvement of imperfect string matching that allows one to reconstruct potential string distortions. The proposed method increases the quality of imperfect string matching, allowing the lookup of misspelled words without significant impact on computational effectiveness. The paper presents the proposed method, experimental data sets and obtained results of comparison to state of the art methods.
Improving performance of large thrust bearings through modeling and experimentation
- Leszek Dąbrowski
- Piotr Pajączkowski
- Grzegorz Rotta
- Michał Wasilczuk
- Michał Wodtke
2013 Full text MECHANICS RESEARCH COMMUNICATIONS
Large thrust bearings are highly loaded machine elements and their failures cause serious losses. Start ups and stoppages of the bearing under load are specially critical regimes of operation. Load carrying capacity depends on the profile of the oil gap. In transient states this profile is also changing. In the design of large thrust bearings minimizing thermo-elastic deformations is an important goal, which can be accomplished due to application of advanced models of the bearing. Modeling of transient states becomes even more complex since there is a dynamic development of temperature distribution and deformations. Often hydrostatic jacking systems are also used. It seems to the authors that advanced bearing models are applied only in research and development of the bearings while very simple modeling is applied in on-line analysis of data from monitoring systems. Analysis of the measurement data with the use of more sophisticated models may be helpful in assessment of current bearing status – especially in early warning. Material issues create a separate problem for modeling, being more important nowadays as polymer lined bearings come into use. The models used for polymer lined bearings require realistic treatment of heat exchange and resilience of the bearing surface layer
Improving the accuracy of bearing in active sonar with cylindrical array using spectrum estimation.
- Wojciech Leśniak
- Mariusz Rudnicki
2013 Full text HYDROACOUSTICS
The articles presents a method for improving the accuracy of bearing in multibeam sonar with a cylindrical array. Based on a known spatial spectrum estimation technique, the method has been successfully used in linear array systems. Its accuracy of bearing is satisfactory and ensures a relatively low computational effort. The article discusses certain simplifications and assumptions to adapt the spatial spectrum estimation technique in linear arrays to the needs of cylindrical arrays. Simulation results are compared to those achieved in the monopulse method.
Improving web user experience with caching user interface
- Artur Opaliński
2013
Often, Web technologies are used to operate or to configure network-enabled equipment, to configure and administer modular applications, or as teaching environments. The comfort of human work requires a similar response time in these applications as in the Internet. To improve response time, various forms of caching at different levels are employed. To improve the user experience in regard to response time when performing specific tasks, a dedicated caching user interface, layered parallel to the Web User Interface, has been introduced and researched by author.
Improving web user experience with caching user interface
- Artur Opaliński
2013 Studia Informatica Pomerania
In human-computer interaction, response time is assumed generally not to exceed significantly 1-2 seconds. While the natural competition in the Internet public Web serving ensures adhering widely to such limits, some Web environments are less competitive and offer much worse user experience in terms of response time. This paper describes a solution to significantly improve user experience in terms of response time with only modification to the user interface, by caching key pieces of data needed for quick browsing, during some tasks performed by humans.
In silico modelling for predicting the cationic hydrophobicity and cytotoxicity of ionic liquids towards the Leukemia rat cell line, Vibrio fischeri and Scenedesmus vacuolatus based on molecular interaction potentials of ions
- Chul-Woong Cho
- Johannes Ranke
- Jurgen Arning
- Jorg THöMING
- Ulrich Preiss
- Christian Jungnickel
- M. Diedenhofen
- Ingo Krossing
- Stefan Stolte
2013 SAR AND QSAR IN ENVIRONMENTAL RESEARCH
In this study we present prediction models for estimating in silico the cationic hydrophobicity and the cytotoxicity (log [1/EC50]) of ionic liquids (ILs) towards the Leukemia rat cell line (IPC-81), the marine bacterium Vibrio fischeri and the limnic green algae Scenedesmus vacuolatus using linear free energy relationship (LFER) descriptors computed by COSMO calculations. The LFER descriptors used for the prediction model (i.e. excess molar refraction (E), dipolarity/polarizability (S), hydrogen-bonding acidity (A), hydrogen-bonding basicity (B) and McGowan volume (V)) were calculated using sub-descriptors (sig2, sig3, HBD3, HBA4, MR, and volume) derived from COSMO–RS, COSMO and OBPROP. With the combination of two solute descriptors (B, V) of the cation we were able to predict cationic hydrophobicity values (log ko ) with r 2 = 0.987 and standard error (SE) = 0.139 log units. By using the calculated log k o values, we were able to deduce a linear toxicity prediction model. In the second prediction study for the cytotoxicity of ILs, analysis of descriptor sensitivity helped us to determine that the McGowan volume (V) terms of the cation was the most important predictor of cytotoxicity and to simplify prediction models for cytotoxicity of ILs towards the IPC-81 (r 2 of 0.778, SE of 0.450 log units), Vibrio fischeri (r 2 of 0.762, SE of 0.529 log units) and Scenedesmus vacuolatus (r 2 of 0.776, SE of 0.825 log units). The robustness and predictivity of the two models for IPC-81 and Vibrio fischeri were checked by comparing the calculated SE and r 2 (coefficient of determination) values of the test set.
In uence of Low-Level Features Extracted from Rhythmic and Harmonic Sections on Music Genre Classi cation
- Aldona Rosner
- Felix Weninger
- Bjorn Schuller
- Marcin Michalak
- Bożena Kostek
2013
We present a comprehensive evaluation of the infuence of 'harmonic' and rhythmic sections contained in an audio file on automatic music genre classi cation. The study is performed using the ISMIS database composed of music files, which are represented by vectors of acoustic parameters describing low-level music features. Non-negative Matrix Factorization serves for blind separation of instrument components. Rhythmic components are identi ed and separated from the rest of the audio signals. Using such separated streams, it is possible to obtain information on the infuence of rhythmic and harmonic components on music genre recognition. Further, the original audio feature vectors stemming from the non-separated signal are extended with such that base exclusively on drum and harmonic sections. The impact of these new parameters on music genre classification is investigated comparing the 'basic' k-Nearest Neighbor classfWi er and Support Vector Machines.
Increase of power and efficiency of the 900 MW supercritical power plant through incorporation of the ORC
- Paweł Ziółkowski
- Dariusz Mikielewicz
- Jarosław Mikielewicz
2013 Full text Archives of Thermodynamics
The objective of the paper is to analyse thermodynamical and operational parameters of the supercritical power plant with reference conditions as well as following the introduction of the hybrid system incorporating ORC. In ORC the upper heat source is a stream of hot water from the system of heat recovery having temperature of 90 °C, which is additionally aided by heat from the bleeds of the steam turbine. Thermodynamical analysis of the supercritical plant with and without incorporation of ORC was accomplished using computational flow mechanics numerical codes. Investigated were six working fluids such as propane, isobutane, pentane, ethanol, R236ea and R245fa. In the course of calculations determined were primarily the increase of the unit power and efficiency for the reference case and that with the ORC.
Incremental construction of finite-state automata
- Jan Daciuk
2013
Rozdział przedstawia algorytmy przyrostowego i półprzyrostowego tworzenia minimalnych deterministycznych automatów skończonych.
Induction motor control application in high-speed train electric drive
- Jarosław Guziński
- Zbigniew Krzemiński
- Arkadiusz Lewicki
- Haitham Abu-Rub
- Marc Diguet
2013
The chapter presents an application of induction motor mechanical speed and load torque observers in high-speed train drives. The observers are applied for a 1.2-MW electric drive with an induction motor. The goal of using such observers is to utilize computed variables for diagnostic purposes of speed sensors and torque transmission system. The concept of diagnostic system is presented in this paper, and proper criteria are proposed. The suggested system is designed to work without a speed sensor in the case of existing sensor faults.Monitored motor load torque is used to limit the maximum motor torque in the case of existing problems in the gearbox. The results of simulation and experimental investigations for a 1.2-MW induction motor drive are presented.
Influence analysis of selected parameters on the ASON/GMPLS control plane performance
- Sylwester Kaczmarek
- Magdalena Młynarczuk
- Paweł Zieńko
2013 Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne
The paper regards the problem of ASON/GMPLS performance. The authors present influence analysis of selected parameters on the ASON/GMPLS control plane performance represented in mean Connection Set-up Time E(CST) and mean Connection Release Time E(CRT). The selected parameters are: offered traffic, request intensity and proportion of requests class. The influence analysis is performed with simulation method by using OMNeT++ discrete-event simulator for two structures of ASON/GMPLS architectures: Poland and Europe.