2015 - Repozytorium publikacji - Politechnika Gdańska

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Topology Discovery of Hierarchical Ethernet LANs without SNMP support
- Krzysztof Nowicki
- Aleksander Malinowski
2015
This paper presents an algorithm that allows for discovery of layer-2 hierarchical Ethernet network topology using agents running on selected end nodes. No SNMP, MIB, hardware, firmware, or operating system-level software modification is required. The method is based on transmission of customized Ethernet frames among installed software agents. It can be used to discover the topology of LAN or one VLAN segment as long as no MAC address filtering is employed. Sample implementation of the discussed algorithm is also proposed.
TOTAL DOMINATION MULTISUBDIVISION NUMBER OF A GRAPH
- Diana Avella-alaminos
- Magda Dettlaff
- Magdalena Lemańska
- Rita Zuazua
2015 Pełny tekst Discussiones Mathematicae Graph Theory
The domination multisubdivision number of a nonempty graph G was defined in [3] as the minimum positive integer k such that there exists an edge which must be subdivided k times to increase the domination number of G. Similarly we define the total domination multisubdivision number msd_t (G) of a graph G and we show that for any connected graph G of order at least two, msd_t (G) ≤ 3. We show that for trees the total domination multisubdivision number is equal to the known total domination subdivision number. We also determine the total domination multisubdivision number for some classes of graphs and characterize trees T with msd_t (T) = 1.
Toward knowledge-grid model for academic purposes
- Mieczysław Owoc
- Paweł Weichbroth
2015
Nowadays we face a huge amount of data and information sharing on the Web by different users worldwide. For example, the academic environment is one of such places where teachers share and manage knowledge for groups of students. This paper proposes a multi-dimensional knowledge space model, designed to distribute and manage knowledge resources efficiently. We view our model as a foundation of a knowledge grid platform. Two crucial aspects should be considered in this model: educational and research. Initially grid model consists of several entities: authors, publications, projects, references and many others. Case study presenting an example of university knowledge-grid will confirm static and dynamical aspects of the creation of such models.
Towards defragmented Lighting Design: concatenating research theories for effective use in design practices.
- Karolina M. Zielińska-Dąbkowska
- Amardeep M. Dugar
2015
This paper aims to provide guidelines for transferring design research to practice in the realm of lighting. It is based on the premise that design research in lighting should function as a development of practice, instead of being a distraction to it. Design research refers to the scholarly inquiry that seeks to advance design by studying and improving it in systematic and scientific ways by expanding, testing and operationalizing the findings of design science; in the context of transferring general fields of research to practice, design research impacts practice in a variety of ways (Telenko, Sosa & Wood, 2013). It includes both art and science, in clearly identi- fiable fields related to the applied sciences and the social sciences (Frankel & Racine, 2010).
Towards Emotion Acquisition in IT Usability Evaluation Context
- Agnieszka Landowska
2015
The paper concerns extension of IT usability studies with automatic analysis of the emotional state of a user. Affect recognition methods and emotion representation models are reviewed and evaluated for applicability in usability testing procedures. Accuracy of emotion recognition, susceptibility to disturbances, independence on human will and interference with usability testing procedures are the criteria, that were identified and addressed in this paper. A study of a usability evaluation case was also performed to spot realistic challenges. As a result, a number of concerns were identified, providing a list of pros and cons for affect acquisition applied in usability testing context.
Towards rainfall interception capacity estimation using ALS LiDAR data
- Tomasz Edward Berezowski
- Jaroslaw Chormanski
- Malgorzata Kleniewska
- Sylwia Szporak-Wasilewska
2015
In this study we develop a spatial model for interception capacity of vegetation based on LiDAR data. The study is conducted in the natural wetland river valley dominated meadows, reeds and small bushes. The multiple regression model was chosen to relate the field measurements of interception capacity and LiDAR statistics at 2m grid. The optimal model was chosen by stepwise selection and further manual variables selection resulting in the r2 of 0.52 and the residual standard error of 0.27 mm. The model preserved the vegetation pattern spatially and showed reasonable estimates for both vegetation covered and not covered by field sampling. The model was, however, affected by LiDAR measurements corrupted by river inundation. The results show good perspective for using LiDAR data for interception capacity estimation.
Towards sugar-derived polyamides as environmentally friendly materials
- Aleksandra Wróblewska
- Arkadiusz Zych
- Shanmugam Thiyagarajan
- Dmytro Dudenko
- Michael Ryan Hansen
- Cor E. Koning
- Rob Duchateau
- Lidia Jasińska-Walc
2015 Polymer Chemistry
As part of our ongoing study investigating isohexide-based polyamides, we have synthesized isosorbide(bis(propan-1-amine)) (DAPIS) and studied its reactivity in the polymerization towards fully biobased polyamides. Polycondensation of nylon salts with various contributions of DAPIS afforded a family of homo- and copolyamides, which were characterized using complementary spectroscopic techniques. The chemical structure of the materials was determined by FT-IR, 1D and 2D liquid-state NMR spectroscopy, whilst the supramolecular arrangement, conformational changes upon heating, and molecular mobility of the polymers were investigated by solid-state 13C{1H} Cross-Polarization/Magic-Angle Spinning (CP/MAS) NMR and 13C{1H} Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) experiments. The abundance of the different DAPIS conformers was determined by DFT-D computational methods. The thermal properties of the polyamides were tested for polymers with different amounts of isohexide units in the backbone by DSC and TGA, demonstrating that the increasing amounts of isohexide diamines efficiently decrease their melting points and slightly decrease their thermal stability. The relaxation processes of the isohexide-derived polyamides were studied by DMTA.
Towards the boundary between easy and hard control problems in multicast Clos networks
- Paweł Obszarski
- Andrzej Jastrzębski
- Marek Kubale
2015 Pełny tekst Bulletin of the Polish Academy of Sciences-Technical Sciences
In this article we study 3-stage Clos networks with multicast calls in general and 2-cast calls, in particular. We investigate various sizes of input and output switches and discuss some routing problems involved in blocking states. To express our results in a formal way we introduce a model of hypergraph edge-coloring. A new class of bipartite hypergraphs corresponding to Clos networks is studied. We identify some polynomially solvable instances as well as a number of NP-complete cases. Our results warn of possible troubles arising in the control of Clos networks even if they are composed of small-size switches in outer stages. This is in sharp contrast to classical unicast Clos networks for which all the control problems are polynomially solvable.
TOXICOLOGICAL ASSESSMENT OF FOOD PACKAGES EXTRACTS
- Błażej Kudłak
- Jacek Namieśnik
- Natalia Jatkowska
2015
In the scientific literature related to the widely understood issue of packaging materials designed to have contact with food (Food Contact Materials – FCM) there is much information on raw materials used for their production, their physiochemical properties, types and parameters. There is also a great number of publications on the management and disposal of used packaging. Unfortunately, not much attention is given to the matters concerning migration of toxic substance from packaging and its actual influence on the body of the final consumer of the food packed, even though health protection and food safety are the priority tasks. The goal of tests was to estimate the impact of foodstuff packaging type, production and storage conditions on the degree of leaching of potentially toxic compounds to foodstuffs with the use of the acute toxicity test Microtox®.
TQM tools in crisis management
- Anna Zielińska
- Grzegorz Zieliński
2015 Pełny tekst Przedsiębiorstwo we współczesnej gospodarce - teoria i praktyka
The current article is concerned with basic aspects connected with improvement of crisis management activities employed by economic operators. The work presents the crisis management model with its fundamental phases and identifies TQM tools that might be applied in all of these phases. The analysis included in the work has been supported with research conducted on companies located in northern Poland
Tracking of the broadband source of the underwater noise in the very shallow water conditions
- Grażyna Grelowska
- Eugeniusz Kozaczka
2015 Pełny tekst HYDROACOUSTICS
The paper contains the result s, both theoretical and experimental , connected with the tracking of the underwater noise source as small ships, pontoon , diver and so on. The pro blem of security in the shallow water area is the challenge for underwater acousticians. In this paper there is take n into account the detection of the sources that move on the surface of the sea or underwater in shallow and very shallow water. The main go al deal s with characterization of the sound propagat ion at the shallow water channel . The next problem is formulation of the sound propagation inside of this acoustic duct including normal mode creations and dispersion of the acoustic energy. When we take into account the small ships noise the two main sources are analyzed. The first one is the vibration energy produced by the mechanisms located inside of the ship hull. The acoustical energy is transformed through structural elements of the hull to surroun ding water. This energy propagates as broadband underwater noise. The next source is the ship propeller. The sources of the underwater noise give the some deposit t o the total acoustical energy that means the ambient noise. The problem that should be solve d is to discover th ese acoustical disturbances along with their classifi cation , identifi cation and tracking
Tradycyjne i nowoczesne kanały dystrybucji wykorzystywane w procesie świadczenia usług ubezpieczeniowych dojrzałym konsumentom
- Bogumił Czerwiński
2015 Pełny tekst Marketing i Zarządzanie
Przedmiotem artykułu są usługi ubezpieczeniowe świadczone z wykorzystaniem tradycyjnych i nowoczesnych kanałów dystrybucji. W artykule skoncentrowano się na osobach powyżej 50 roku życia, szczególnie narażonych na zjawisko wykluczenia cyfrowego. Na podstawie przeglądu literatury sformułowano hipotezę badawczą: cechy społeczno – demograficzne osób powyżej 50 roku życia wpływają na ich skłonność do korzystania z usług ubezpieczeniowych za pomocą tradycyjnych i nowoczesnych kanałów dystrybucji. Badania przeprowadzane wśród 753 osób w wieku 50+ pochodzących z północnej Polski pozwoliły na pozytywną weryfikację postawionej hipotezy w zakresie kanałów nowoczesnych, z istotnym wpływem: dochodu, wykształcenia, wieku i statusu na rynku pracy. Jednocześnie badania nie potwierdziły założonej hipotezy w zakresie tradycyjnych kanałów dystrybucji. W artykule zawarto ponadto rekomendacje dla praktyki gospodarczej służące lepszemu dostosowaniu oferty rynkowej do oczekiwań klientów oraz ograniczeniu skali wykluczenia finansowego na rynku ubezpieczeniowym.
Transcriptome profiling reveals distinctive traits of retinol metabolism and neonatal parallels in the MRL/MpJ mouse
- Justyna Podolak-Popinigis
- Bartosz Górnikiewicz
- Anna Ronowicz
- Paweł Sachadyn
2015 Pełny tekst BMC GENOMICS
Background: The MRL/MpJ mouse is a laboratory inbred strain known for regenerative abilities which are manifested by scarless closure of ear pinna punch holes. Enhanced healing responses have been reported in other organs. A remarkable feature of the strain is that the adult MRL/MpJ mouse retains several embryonic biochemical characteristics, including increased expression of stem cell markers. Results: We explored the transcriptome of the MRL/MpJ mouse in the heart, liver, spleen, bone marrow and ears. We used two reference strains, thus increasing the chances to discover the genes responsible for the exceptional properties of the regenerative strain. We revealed several distinctive characteristics of gene expression patterns in the MRL/MpJ mouse, including the repression of immune response genes, the up-regulation of those associated with retinol metabolism and PPAR signalling, as well as differences in expression of the genes engaged in wounding response. Another crucial finding is that the gene expression patterns in the adult MRL/MpJ mouse and murine neonates share a number of parallels, which are also related to immune and wounding response, PPAR pathway, and retinol metabolism. Conclusions: Our results indicate the significance of retinol signalling and neonatal transcriptomic relics as the distinguishing features of the MRL/MpJ mouse. The possibility that retinoids could act as key regulatory molecules in this regeneration model brings important implications for regenerative medicine.
Transcriptomic Effects of Estrogen Starvation and Induction in the MCF7 Cells. The Meta-analysis of Microarray Results
- Anna Stanisławska-sachadyn
- Paweł Sachadyn
- Janusz Limon
2015 CURRENT PHARMACEUTICAL BIOTECHNOLOGY
Estrogen is one of the most important signaling molecules which targets a number of genes. Estrogen levels regulate cell proliferation and a plethora of metabolic processes, which may interfere with a range of medical conditions and drug metabolism. The MCF7 breast cancer cell line, expressing the estrogen receptor α, is a well-studied model of cellular answer to estrogen. The aim of this study was to characterize transcriptomic responses to estrogen in a broad time range. We performed a meta-analysis of microarray data on gene expression in the MCF7 cells under estrogen exposure and deprivation. As the result we distinguished three major phases of transcriptomic response to stimulation with 17β- estradiol: the early (1-2 h), with the activation of the MAPK signaling pathway; the intermediate (3-12 h), with enhanced expression of genes participating in cell surface receptor linked signal transduction and cellular homeostasis; and the late one (24-48 h), with the induction of genes involved in mitotic cell division. Two main phases under estrogen starvation were indicated as the early (1-3 days), with elevated expression of genes associated with cell projection and repression of those responsible for cell cycle regulation, and the late (15-180 days), with increased expression of genes of cell adhesion proteins. The meta-analysis displayed how different gene sets are either induced or repressed following either estrogen exposure or deprivation, and how the gene expression changes are orchestrated by estrogen in time dependent manner, indicating that proper understanding of estrogen impact on transcriptional gene activity requires an extensive time perspective.
Transfer znaczeń a kreowanie wartości marki w gospodarce sieciowej w aspekcie S-DLogic
- Wioleta Kucharska
2015 Pełny tekst Marketing i Zarządzanie
Artykuł poświęcono sieciowemu kreowaniu wartości współczesnych przedsiębiorstw, w tym wartości kluczowego aktywa niematerialnego, jakim jest marka. Autorka przedstawia istotę procesu kreowania wartości we współczesnej gospodarce oraz porusza aspekty konfiguracji sprawnej sieci opartej na kapitale relacji i idei S-DLogic w kontekście gospodarki sieciowej. Zwraca szczególną uwagę na współkreację znaczeń w ramach celowo skonfigurowanej sieci interakcji i integracji zasobów, a także na transfer znaczeń, kluczowy dla tworzenia wartości. Artykuł stanowi syntezę wiedzy dotyczącą procesu sieciowego kreowania wartości, a także teoretyczne uzasadnienie dla dalszych badań nad determinantami identyfikacji konsumenta z marką w gospodarce sieciowej.
Transformacja systemów bankowych w wybranych krajach bałtyckich
- Gabriela Golawska-Witkowska
- Ewa Mazurek-Krasodomska
- Anna Rzeczycka
2015
Celem monografii jest ocena zmian zachodzących w systemach bankowych wybranych krajów bałtyckich w okresie transformacji systemowej. Scharakteryzowano w niej systemy bankowe na Litwie, Łotwie i w Estonii oraz makro i mikrootoczenie banków od lat 90. XX wieku aż do 2014 roku. Przedstawiono w niej sytuację ekonomiczno-finansową państw bałtyckich na początku okresu transformacji koncentrując się na genezie zachodzącego w tych krajach procesu transformacji systemowej. Omówiono istotę i rodzaje systemu bankowego w gospodarce planowanej i w gospodarce rynkowej oraz rolę tego systemu dla funkcjonowania gospodarki i społeczeństwa. Następnie skoncentrowano się na omówieniu najważniejszych tendencji mających wpływ na kształt systemów bankowych, do których zaliczono ich liberalizację, prywatyzację i konsolidację. Przedstawiono również w jaki sposób zmiany zachodzące w systemie bankowym ocenione zostały przez wybrane światowe instytucje finansowe. Przedstawiono także podstawowe instytucje, które funkcjonują w systemach bankowych krajów bałtyckich oraz sprawują nad nimi nadzór. Analiza i ocena procesów zachodzących w okresie transformacji ustrojowej i gospodarczej w badanych podmiotach i ich otoczeniu pozwoliła określić przekształcenia zachodzące w systemie bankowym Litwy, Łotwy i Estonii.
Transition Metal Oxides influence on phosphate and borate glasses structure
- Tomasz Lewandowski
- Marta Prześniak-Welenc
- Leszek Wicikowski
2015
Borate and phosphate glasses possess many potential luminescence and optical applications. With their low melting point, they are one of the most often studied amorphous materials. In recent years these glasses, doped with transition metal oxides (TMO), gained much attention due to their tunable structural and thermal properties. Review of systems containing TMOs was presented. Additionally synthesis of binary MnO-P2O5 and MnO-B2O3 systems was presented. In this work xMnO-(100-x)P2O5 and xMnO-(100-x)B2O3 (where x = 40, 50 and 60 mol%) glasses have been synthesized and compared. Conventional melt-quenching technique has been used in both cases. Amorphous material has been obtained in two series of samples. Infrared spectroscopy studies (FTIR) shown some structural modifications in function of MnO content. It is proposed that MnO causes degradation of structural units of both phosphate and borate glasses. DSC studies presented different effect on Tg and melting temperature change in case of considered systems. Further, TMO affects differently the thermal stability ofsynthesized glasses.
Transmission Protocol Simulation Framework For The Resource-Constrained Wireless Sensor Network
- Marek Wójcikowski
2015 Pełny tekst Metrology and Measurement Systems
In this paper a prototype framework for simulation of wireless sensor network and its protocols are presented. The framework simulates operation of a sensor network with data transmission, which enables simultaneous development of the sensor network software, its hardware and the protocols for wireless data transmission. An advantage of using the framework is converging simulation with the real software. Instead of creating a model of the sensor network node, the same software is used in real sensor network nodes and in the simulation framework. Operation of the framework is illustrated with examples of simulations of selected transactions in the sensor network.
Transparent thin films of Cu-TiO2 with visible light photocatalytic acitivity
- Marcin Janczarek
- Anna Zielińska-Jurek
- Irmina Markowska
- Jan Hupka
2015 PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
Thin films of Cu–TiO2 with a high level of transparency were prepared by a dip-coating procedure on the glass surface. CuCl2 was used as a copper precursor added during sol – gel synthesis of TiO2. The extension of optical absorption into the visible region of as-prepared thin films was indicated by UV/Vis spectroscopy. Only the anatase phase was detected by X-ray di ffraction analysis (XRD). The presence of copper in the structure of thin films was confirmed by energy dispersive X-ray spectrometry (EDS). The significant rate of phenol and 4-chlorophenol mineralization was observed during visible light irradiation. The photocatalytic activity of the prepared thin films is correlated with the optimum copper content in the structure. Copper in metallic form and cupric oxides were not detected by XRD and scanning electron microscopy analysis. It is suggested that copper may exist as dispersed ions in the TiO2 lattice.
Transport properties of aqueous ionic liquid microemulsions: influence of the anion type and presence of the cosurfactant
- Justyna Łuczak
- Jakub Piekart
2015 SOFT MATTER
Transport properties, viz. specific conductivity, dynamic viscosity and apparent diffusion coefficients, were measured as a function of water content in aqueous ionic liquid microemulsions containing 1-butyl-3- methylimidazolium hexafluorophosphate, [BMIM][PF6] and bis(trifluoromethanesulphonyl)imide, [BMIM][Tf2N], stabilized by the nonionic surfactant TX-100, or its mixture with a cosurfactant, i.e. butanol. The investigation covered the whole water content range through various (Winsor I–III and dissolved solution) structures of the system. The comparative approach allowed closer inspection into phenomena being on the background of observed transport properties behavior taking into account the influence of the cosurfactant. The addition of butanol offers considerable advantages, such as an increase in conductivity, especially in systems containing ionic liquids with lower conductivity. This is accompanied by a significant decrease in viscosity, even to values that are comparable with those of molecular solvents. Moreover, the reasons for the surprisingly higher conductivity of [BMIM][PF6]-based systems were provided, and the conclusions were supported by cyclic voltammetry as well as spectrophotometric and dynamic light scattering measurements.