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Publications from the year 2010
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Improving automatic surveillance by sound analysis
- Kuba Łopatka
- Józef Kotus
- Andrzej Czyżewski
An automatic surveillance system, based on event detection in the video image can be improved by implementing algorithms for audio analysis. Dangerous or illegal actions are often connected with distinctive sound events like screams or sudden bursts of energy. A method for detection and classification of alarming sound events is presented. Detection is based on the observation of sudden changes in sound level in distinctive sub-bands or in parameter values. Among the parameters, there are specially defined features connected with the energy ratio in certain sub-bands of the spectrum and the shape of the signal around transients. The parameter set is completed with MPEG-7 descriptors chosen on the basis of experiments and statistical analysis. For classification a Support Vector Machine classifier is implemented. The model is built using a test set of sounds recorded in real conditions. Separate classifiers are implemented for different classes of sound events. The length of the analysis frame and threshold values for event detection are set to fit the characteristics of a certain type of sound. The accuracy is then improved by the decision procedure. The final indication of the system is derived from decisions of all classifiers, compared in a number of adjacent analysis frames. The classifier yields high accuracy of detecting typical alarming sound events like gunshot, scream, explosion, broken glass or horn abuse. It also provides the possibility to retrain the model and add a new type of event to be recognized by the system. The described solution can be implemented in an automatic surveillance system together with image analysis. Processing both sound and image leads to a significant improvement of the event detection rate. The developed algorithms can be implemented to detect dangerous events in large public areas like stations, airports or stadiums.
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Improving the accuracy of subgridding scheme in finite differences method based on Legendre polynomials expansion
- Piotr Kowalczyk
- Łukasz Kulas
- Michał Mrozowski
In this article the Legendre polynomials have been used to interpolate the field at the boundary of the meshes of different densities. The numerical verification of the proposed technique has been carried out in frequency domain. It has been shown that the accuracy of the presented method is very high and stable - the error monotonically decreases as a function of the refinement factor.
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Increased cytotoxicity of an unusual DNA topoisomerase II inhibitor compound C-1305 toward HeLa cells with downregulated PARP-1 activity results from re-activation of the p53 pathway and modulation of mitotic checkpoints
- Michał Sabisz
- Józefa Węsierska-Gądek
- Andrzej Składanowski
Our previous studies have shown that murine fibroblast cells, in which PARP-1 gene was inactivated by gene disruption, are extremely sensitive to triazoloacridone compound C-1305, an inhibitor of DNA topoisomerase II with unusual properties. Here, we show that pharmacological inhibition of PARP-1 activity by its inhibitor compound NU1025, sensitizes human cervical carcinoma HeLa cells to compound C-1305 compared to treatment with drug alone. Cytotoxic effect of drug/NU1025 of other topoisomerase II inhibitors varied depending on the dose of PARP-1 inhibitor. Increased cytotoxicity of topoisomerase II inhibitor/NU1025 combinations was attributable to the re-activation of the p53 pathway in drug-treated HeLa cells. This lead to a more stringent cell cycle checkpoint control during G2 and M and enhanced cell death by mitotic catastrophe induced by drug/NU1025 combinations. Interestingly, treatment of HeLa cells with NU1025 alone also increased p53 expression. This effect is, at least in part, related to the inhibition of proteasome activity by drug treatments. Together, our results show that concomitant inhibition of topoisomerase II and PARP-1 leads to the synergistic cytotoxic effect toward tumor cells that may be important for combination therapies with NU1025 and topoisomerase II inhibitors. We also confirmed our earlier work and show the important role of PARP-1 activity in the maintenance of the G2 arrest induced by DNA damaging drugs. Finally, based on our studies we propose that NU1025 and possibly other inhibitors of PARP-1 may be used as non-genotoxic agents to activate p53 in tumor cells with non-functional p53 pathways.
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Inelastic damage-involved response of colliding buildings during earthquakes
- Sayed Mahmoud
- Robert Jankowski
W artykule poddano analizie nieliniowe zachowanie się kolidujących ze sobą budynków powodujące ich uszkodzenie podczas trzęsień ziemi. Analiza dotyczy zderzeń pomiędzy dwoma sąsiednimi budynkami czterokondygnacyjnymi. Badania pokazują, iż zastosowanie nieliniowego modelu numerycznego zachowania się obu budowli podczas trzęsień ziemi ma duże znaczenia dla dokładności wyników.
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Inexpensive Helical Antenna for Global Navigation Satellite Systems
- Łukasz Sorokosz
- Włodzimierz Zieniutycz
Zaprezentowane zostały wyniki badań teoretycznych oraz eksperymentalnych niskobudżetowej anteny na pasmo L. Wyjściowa geometria struktury została obliczona na podstawie ogólnych wzorów. Efekt przesunięcia częstotliwości wywołany przez użycie rdzenia PU został również uwzględniony. Równolegle przeprowadzono badania wrażliwości parametrów anteny na proces produkcji. Zaprojektowano i wykonano układ dopasowania impedancyjnego. W paśmie 1.48-1.67 GHz uzyskano straty odbiciowe na poziomie niższym od -18 dB. Przedstawiono również wyniki pomiaru eliptyczności oraz charakterystyk promieniowania.
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Influence and selection of basic concepts on ontology design
- Tomasz Maria Boiński
- Piotr Orłowski
- Piotr Szpryngier
- Henryk Krawczyk
Ontologies as entities representing individual point of view on surrounding world introduce heterogeneity to knowledge representation. Common set of core concepts can introduce similarity big enough for further interoperability between ontologies. In this paper an experiment is presented proving that despite differences in detail ontologies stay similar in regard of core concepts. During the experiments NOIA methodology enhanced by OCS methodology was used to create ontologies from three significantly different sources of knowledge about risk management.
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Influence of accelerometer signal pre-processing and classification method on human activity recognition
- Adam Kupryjanow
- Katarzyna Kaszuba-Miotke
- Andrzej Czyżewski
A study of data pre-processing influence on accelerometer-based human activity recognition algorithms is presented. The frequency band used to filter-out the accelerometer signals and the number of accelerometers involved were considered in terms of their influence on the recognition accuracy. In the test four methods of classification were used: support vector machine, decision trees, neural network, k-nearest neighbor.
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Influence of cavitation intensity on the relative cavitation resistance of laser processed C45 carbon steel
- Marek Szkodo
Praca przedstawia badania względnej odporności kawitacyjnej we wstępnym okresie niszczenia laserowo przetopionej 6 kW laserem CO2 stali C45. Badania odporności kawitacyjnej wykonano na stanowisku z wirującą tarczą. Na erodowanej przetopionej warstwie powierzchniowej określono trzy obszary o różnej intensywności oddziaływania obciążeń kawitacyjnych. Określano wielkość odkształceń plastycznych w analizowanych obszarach, spowodowanych obciążeniami kawitacyjnymi i na tej podstawie określano względną odporność kawitacyjną. Odkształcenia plastyczne powierzchni określano za pomocą metod analizy obrazu erodowanej powierzchni. Wykazano, że im jest mniejsze natężenie kawitacji tym większy jest wzrost odporności kawitacyjnej laserowo przetapianej stali C45.
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Influence of ducting geometry on working parameters of pipe type hydraulic turbines
- Janusz Iwan
Mała energetyka wodna. Omówiono własności użytkowe - głównie, sprawność i adaptacyjność - uzyskiwane poprzez rozwiązania układów turbinowych stosowanych w obszarze zagospodarowywania piętrzeń niskospadowych. Wskazano przyczyny od których te własności zależą. Pokazano też przykład rozwiązania o pożądanych własnościach dla zagospodarowywania obiektów w mało atrakcyjnym ekonomicznie obszarze piętrzeń najniższych.
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Influence of geometric imperfections on capacities of silo structures loaded with pressure below atmospheric
- Magdalena Gołota
- Jarosław Górski
- Tomasz Mikulski
- Karol Winkelmann
Przedstawiono probabilistyczną analizę nośności aluminiowego silosu ze wstępnymi imperfekcjami geometrycznymi obciążonego podciśnieniem. Imperfekcje opisano za pomocą dyskretnych odchyłek przyjętych zgodnie z maksymalnymi niedokładnościami dopuszczonymi przez normy. Ponadto wygenerowano imperfekcje płaszcza silosu, stosując jednorodne i niejednorodne pola losowe. Wykonano numeryczne obliczenia geometrycznie i materiałowo nieliniowe.
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Influence of laser melting on surface layer properties of titanium alloy Ti6Al4V
- Agnieszka Ossowska
- Andrzej Zieliński
- Marcin Buczek
In time of rapid technology and medicine progress, implants are becoming more widely used in the human body, ranging from dental implants, stabilizing plates, screws, orthopaedic prostheses. For example, there are many types of hip prostheses used for hip replacement as well as various types of materials used for these orthopaedic prostheses. Properties of titanium alloys used in hip prostheses combined with good strength properties, corrosion resistance and low modulus of elasticity, are the most compatible of all prosthetic materials such as cobalt alloys, corrosion resistance steel. However, their major drawback is the low wear resistance. In order to tackle this drawback the solution may be a hardening of the surface while maintaining the core characteristics. The laser melting process is the method that is utilized for precise and selective treatment of the surface layer. By concentrating a large portion of energy in a small area, laser technology allows to obtain better structures [1-3] than produced in traditional process [4]. This article presents the investigations results of titanium alloy Ti6Al4V surface layer after laser melting process. The process of laser melting was performed using Nd-YAG laser. Individual samples were laser melted using different scanning speeds and different shifts in the laser beam. The evaluation of structure of the alloy as well as hardness and chemical composition was performed. It was shown that laser melting changes the structure and properties of titanium alloy Ti6Al4V, process parameters as scanning speed affects the thickness of zones in upper layer of the material. Due to the laser melting process more wear resistive surface can be obtained that increases the wear and corrosion resistance of orthopeadic prosthesis.
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Influence of main design parameters of ship propeller shaft water-lubricated bearings on their properties
- Wojciech Litwin
W artykule omówiono wpływ głównych parametrów konstrukcyjnych i eksploatacyjnych takich jak wielkość luzu łożyskowego, własności materiału panwi, stanu powierzchni skojarzenia ślizgowego oraz temperatury i zasolenia wody na nośność hydrodynamiczną łożyska okrętowego wału śrubowego smarowanego wodą.
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Influence of statistical errors on damage detection based on structuralflexibility and mode shape curvature
- Agnieszka Tomaszewska
Damage detection procedures based on measured natural frequencies and building structure mode shapes are discussed in this paper. Modal curvature and structural flexibility approaches are tested. Attention is paid to the modal identification errors that influence damage detection. This problem is studied using a computer simulation of a simple supported beam. For practical cases, the peak picking methodand its statistical errors are considered. In order to distinguish between true and false damage detection results, the Absolute Damage Index is proposed. Finally, the complexity of the problem in the case of a real building structure is presented.
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Influence of substituents in vinyl groups on reactivity of parylene during polymerization process
- Sylwia Freza
- Piotr Skurski
- Maciej Bobrowski
Praca zawiera wyniki obliczeń kwantowych wielokonfiguracyjnych i DFT mechanizmów reakcji parylenu i cząsteczek z wiązaniami podwójnymi w fazie gazowej. Zbadany został i zanalizowany wpływ podstawników w strukturach alkenów na reaktywność parylenu i alkenów.
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Influence of vacuum sublimation deposited metal layer thickness on metrological parameters of the amperometric gas sensor with Nafion membrane
- Jacek Gębicki
The paper presents the results of investigation on an influence of vacuum sublimation deposited platinum layer thickness on the signal, sensitivity and response time of a prototype of sulphur dioxide sensor with Nafion membrane. The working electrode was made by vacuum sublimation deposition of platinum on a surface of Nafion membrane. Pt layers deposited changed an initial structure of Nafion membrane and that phenomenon was utilized in the impedance measurements. A diffusion of the analyte to an inactive electrode was observed on the impedance spectra. An electrical equivalent circuit for analysis of the impedance spectra was proposed. Following the evolution of particular electrical elements enabled determination of the optimum thickness of deposited platinum.
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Informacja - Krok w kierunku dostępności i bezpieczeństwa
- Marek Wysocki
Artykuł opisuje rolę informacji w przestrzeni publicznej dla lepszej orientacji użytkownikow w tym szczególnie osób o ograniczonej percepcji. Przedstawiono zagadnienia związane z projektowaniem Systemów Informacji Miejskiej (SIM). Szczególną uwagę zwrócono na problemy orientacji w przestrzeni miejskiej osób niewidomych
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Informatyczne wspomaganie systemów zarządzania jakością z uwzględnieniem potrzeb sektora MŚP
- Piotr Grudowski
- Aleksander Czarnacki
W opracowaniu zarysowano trendy rozwojowe dotyczące systemów informatycznych wspomagających zarządzanie jakością w małych i średnich przedsiębiorstwach. Szczególny nacisk połozono na wsparcie metodyki statystycznego nadzorowania procesów oraz ich modelowania.
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Iniekcje cementowe pod podstawami pali wierconych w zastosowaniu do obiektów mostowych.
- Kazimierz Gwizdała
- Adam Pinkowski
Omówiono założenia teoretyczne, przedstawiono metody oraz przedstawiono przykłady zastosowań iniekcji cementowych pod podstawami pali wierconych wykonanych pod posadowienie obiektów mostowych.
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Innovative activity of SMEs In Poland
- Marzena Grzesiak
Innovative activity of enterprises is determined by many factors. On one hand, these are external factors creating a sort of innovative climate in the economy, on the other hand - there are many internal factors stimulating or reducing the intensity of innovative activities. What influences the innovativeness of enterprises is the effectiveness of the system supporting innovations, which was stated by for example Pyciński and Żołnierski . This system covers enterprises, universities and R&D units, supporting infrastructure, financial system, agendas and public programs. Key role is played here by enterprises as units implementing innovations in the economy. However, the dynamics of the whole system is influenced by the interdependencies between all the participants of innovative process. Innovative activity of Polish SMEs is not high. It is confirmed by the results of many researches carried out by Polish and European institutions. Innovative activity should concern not only the creation of innovative potential, but also the intensification of innovative processes. The most crucial element of innovative potential is people , but other elements like information, organizational structure, management, technical and financial resources are not of minor importance. Entrepreneurs as the most serious barriers in carrying out innovative activity indicate: lack of financial resources, high innovation costs, difficult access to external resources of financing or their lack.Although it is difficult to determine the exact impact of economic crisis on the innovativeness of Polish SMEs it can be stated on the basis of statistical data that in 20 out of 29 sectors a fall in production was observed . In the chapter selected results of research will be analyzed, also ones carried out by the author.
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