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    Wyświetlanie 1-12 z 12
    Tytuł:
    Neuromorphic approach for breathing rate monitoring using data produced by FMCW radar
    Autorzy:
    Ślot, Krzysztof
    Łuczak, Piotr
    Hausman, Sławomir
    Powiązania:
    https://bibliotekanauki.pl/articles/2173715.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    neuromorphic architectures
    analog computing
    FMCW radar
    vital parameter estimation
    architektura neuromorficzna
    obliczenia analogowe
    radar FMCW
    ocena parametrów życiowych
    Opis:
    The paper introduces a neuromorphic computational approach for breathing rate monitoring of a single person observed using a Frequency-Modulated Continuous Wave radar. The architecture, aimed at implementation in analog hardware to ensure high energy efficiency and to provide system operation longevity, comprises two main functional modules. The first one is a data preprocessing unit aimed at the extraction of information relevant to the analysis objective, whereas the second one is a pre-trained recurrent neural regressor, which analyzes sequences of incoming samples and estimates the breathing rate. To ensure compatibility with neural processing and to achieve simplicity of underlying resources, several solutions were proposed for the data preprocessing module, which provides range-wise space segmentation, selection of a bin of interest (comprising the dominant motion activity), and delivery of data to regressor inputs. To implement these functions, we introduce an appropriate chirp frequency modulation scheme, apply a neuromorphic filtering procedure and use a Winner-Takes-All network for extracting information from the bin of interest. The architecture has been experimentally verified using a dataset of indoor recordings supplied with reference data from a Zephyr BioHarness device. We show that the proposed architecture is capable of making correct breathing rate estimates while being feasible for analog implementation. The mean squared regression error with respect to the Zephyr-produced reference values is approximately 3.3 breaths per minute (with a deviation of ±0:27 in the 95% confidence interval) and the estimates are produced by a recurrent, GRU-based neural regressor, with a total of only 147 parameters.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 6; art. no. e143552
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Human–robot cooperation in sorting of randomly distributed objects
    Autorzy:
    Jezierski, Edward
    Łuczak, Piotr
    Smyczyński, Paweł
    Zarychta, Dariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/229240.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    human–robot cooperation
    vision system
    collaborative robots
    Opis:
    The paper presents the possibilities of teaching a robot controller to perform operations of autonomous segregation of objects differing in features that can be identified using a vision system. Objects can be arranged freely on the robot scene also covered with others. In the learning phase, a robot operator presents the segregation method by moving subsequent objects held in a human hand, e. g. a red object to container A, a green object to container B, etc. The robot system, after recognizing the idea of segregation that is being done using the vision system, continues this work in an autonomous way, until all identified objects will be removed from robotic scene. There are no restrictions on the dimensions, shapes and placement of containers collecting segregated objects. The developed algorithms were verified on a test bench equipped with two modern robots KUKA LBR iiwa 14 R820.
    Źródło:
    Archives of Control Sciences; 2019, 29, 4; 603-615
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of the KUKA KUBE test-bed for the hardware-in-the-loop validation of the space manipulator control system
    Autorzy:
    Wojtunik, Mateusz
    Łuczak, Piotr
    Rybus, Tomasz
    Granosik, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/27314468.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Centrum Badań Kosmicznych PAN
    Tematy:
    space manipulator
    hardware-in-the-loop
    experimental validation
    control systems
    orbital robotics
    KUKA industrial robot
    Opis:
    The on-ground validation of control systems designed for manipulators working in orbit is very difficult due to the necessity of simulating the microgravity environment on Earth. In this paper, we present the possibilities of utilising the KUKA KUBE test-bed with industrial robots to experimentally verify space systems using hardware-in-the-loop tests. The fixed-base KUKA industrial robot is operated in gravitational environment, while the space system model plant is solved in real time parallel to on-ground experiment. The test-bed measurements are the input of the model plant, and the output of the model is treated as an input for the industrial robot actuation. In the performed experiment, the control system based on the Dynamic Jacobian is validated. The desired point that is reached by the manipulator’s endeffector is constant in the simulated environment and moving with respect to the test-bed frame. The position of the space manipulator’s end-effector is calculated by evaluating dynamics of the satellite in real-time model. The results show that the control system applied to the KUKA robot works correctly. The measurements from the torque sensors mounted in KUKA robot’s joints are in accordance with the simulation results. This fact enhances the possibilities of gravity compensation, thus simulating microgravity environment on the test-bed.
    Źródło:
    Artificial Satellites. Journal of Planetary Geodesy; 2023, 58, Special Issue 1; 231--248
    2083-6104
    Pojawia się w:
    Artificial Satellites. Journal of Planetary Geodesy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fostering A Multi-level Approach to Entrepreneurial Pedagogy: The German Experience
    Autorzy:
    Łuczak-Trąpczyńska, Magdalena
    Trąpczyński, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/1197785.pdf
    Data publikacji:
    2017-06-08
    Wydawca:
    Akademia Ignatianum w Krakowie
    Tematy:
    entrepreneurial pedagogy
    entrepreneurial education
    Germany
    Opis:
    RESEARCH OBJECTIVE: The aim of this paper is to analyse the case of entrepreneurial pedagogy in Germany at the level of primary and secondary education and to identify good practices in the development of entrepreneurship skills of pupils. THE RESEARCH PROBLEM AND METHODS: The paper uses a systematic review of literature with relation to entrepreneurial education, as well as the German literature of the topic, in order to descend to the analysis of secondary data related to the German education system and its usage of entrepreneurial pedagogy. THE PROCESS OF ARGUMENTATION: In the first part, the paper clarifies the notion of entrepreneurial pedagogy and introduces modern didactic approaches, particularly process-oriented teaching. Subsequently, the German case is used to analyse how entrepreneurial pedagogy can be implemented at different interrelated levels. In the recommendation section, the success factors of the implementation of such an approach are discussed. The paper ends with some concluding remarks. RESEARCH RESULTS: The analysis of entrepreneurial pedagogy in German literature and practice highlights the relevance of an interplay of solutions at different levels: the level of the state (or, in the case of decentralised educational systems like the German one, at the regional level), the level of school initiative, as well as the individual level of educators who are in charge of implementing entrepreneurial teaching methods. CONCLUSIONS, INNOVATIONS AND RECOMMENDATIONS: According to the concept of process-oriented didactics presented in this paper, the aspect of making mistakes is an important engine of learning, as well as teaching itself. However, it can be observed in Germany that in teaching reality more attention is devoted to the errors themselves than to the tolerance of errors, according to the principle that the teacher does not commit mistakes. Hence, this issue should be raised in appropriate teacher training. The German experience can be a starting point for discussion related to other countries, as well. 
    Źródło:
    Horyzonty Wychowania; 2017, 16, 37; 129-146
    1643-9171
    2391-9485
    Pojawia się w:
    Horyzonty Wychowania
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of computer programs to solve ventilation issues in Vietnamese coal mines
    Wykorzystanie programów komputerowych do rozwiązywania problemów wentylacyjnych w wietnamskich kopalniach węgla
    Autorzy:
    Bui, Hoa
    Życzkowski, Piotr
    Łuczak, Rafał
    Powiązania:
    https://bibliotekanauki.pl/articles/318979.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    wentylacja
    kopalnie
    Wietnam
    ventilation
    coal mines
    Vietnam
    Opis:
    Having enjoyed an economic upsurge in recent years, Vietnam is now recording increased demand for electrical energy. Its production, for the most part, relies on the coal mining industry, thus resulting in a strong upward trend in mining volumes. Being geologically complex, Vietnamese mines are characterised by a complicated structure of their headings. The local ventilation systems are also affected by there being very few automatic dams and an by increases in airflows delivered to the mine. For this reason, in order to analyse airflows and maintain the proper control of ventilation systems, computer software is required. The article offers a comparison of computer programs – Kazemaru, VentGraph and VentSim – as employed for use in Vietnamese mines. The assessment covered the manner in which these programs are used and how their output data are presented, as well as their range of applications in the conditions of Vietnamese coal mines.
    Źródło:
    Inżynieria Mineralna; 2019, 21, 2/2; 119-128
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Climatic hazard assessment in selected underground hard coal mines in Vietnam
    Ocena zagrożenia klimatycznego w wybranych podziemnych kopalniach węgla kamiennego w Wietnamie
    Autorzy:
    Quan, Truong Tien
    Łuczak, Rafał
    Życzkowski, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/318205.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    zagrożenia klimatyczne
    kopalnie podziemne
    Wietnam
    climatic hazards
    underground hard coal mines
    Vietnam
    Opis:
    The article discusses the possibility of improving the microclimate in underground hard coal mines in Vietnam. Vietnamese underground mines are shallow mines which extract coal deposits accumulated up to 500 m below ground. According to the current Vietnamese laws, coal deposits can be mined if air temperature does not exceed 30oC, although this rule is not always observed, especially during summer. This article analyses the impact of air parameters on the climatic conditions in headings and the use of the air temperature reduction method in selected underground mines in Vietnam.
    Źródło:
    Inżynieria Mineralna; 2019, 21, 2/2; 156-164
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selection and calculation of air cooling solutions in underground coal mines in Vietnam
    Dobór i obliczenia rozwiązań chłodzenia powietrza w podziemnych kopalniach węgla w Wietnamie
    Autorzy:
    Borowski, Marek
    Trung Tien, Quan
    Łuczak, Rafał
    Życzkowski, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/1841452.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    air temperature
    air humidity
    air cooling
    thermal power of cooler
    temperatura powietrza
    wilgotność powietrza
    chłodzenie powietrza
    moc cieplna chłodnicy
    Opis:
    Currently, Vietnamese underground mines have been exploited down to -500 m and, in the near future, they will be exploited deeper. The exploitation of coal of seams has an negative impact on a workers environment. The increase in the depth of coal seam exploitation causes is the increase of adverse microclimate factors such as temperature, moisture, heat radiation. According to the current Viet¬namese laws, coal deposits can be mined in a condition when air temperature does not exceed 30oC, although this rule is not always observed, especially during summer. The article show how reducing the adverse impact of climate factors in the mines and calculating the parameters which reduce the temperature on an example in one of underground coal mines in Vietnam.
    Obecnie wietnamskie kopalnie podziemne zostały wyeksploatowane do -500 m, w najbliższej przyszłości będą eksploatowane głębiej. Eks¬ploatacja ma negatywny wpływ na środowisko. Działalność eksploatacji w wyrobiskach powoduje wzrost niekorzystnych czynników mi-kroklimatycznych, takich jak temperatura, wilgotność, promieniowanie cieplne. Zgodnie z obowiązującym wietnamskim prawem, złoża węgla mogą być eksploatowane w warunkach, gdy temperatura powietrza nie przekracza 30°C, chociaż nie zawsze jest to przestrzegane, zwłaszcza latem. W artykule przedstawiono rozwiązanie ograniczania niekorzystnego wpływu czynników klimatycznych w kopalniach oraz obliczenie parametrów obniżających temperaturę powietrza na przykładzie podziemnych kopalń węgla w Wietnamie.
    Źródło:
    Inżynieria Mineralna; 2020, 2, 2; 237-244
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Method of Air Temperature Forecast in Mechanized Longwall Workings in the Conditions of Vietnamese Mines
    Autorzy:
    Truong, Tien Quan
    Łuczak, Rafał
    Życzkowski, Piotr
    Borowski, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2020186.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    climatic conditions
    temperature forecasting
    statistical data analysis
    warunki klimatyczne
    prognozy
    temperatura
    statystyka
    Opis:
    In the most recent years, the Vietnam National Coal - Mineral Industries Holding Corporation Limited (VINACOMIN) has been dynamically developing mechanization technologies in underground coal mines. The climatic conditions of Vietnam, as well as increasing the depth of the coal seams and the production capacity, contribute to an air temperature increasing in mining excavations. The article presents statistical equations enabling air temperature forecasting at the outlet of mechanized longwall workings. The results of numerical calculations, obtained from the solutions of the adopted mathematical descriptions, were compared with the measurement results and the statistical significance of the obtained deviations was determined. The performed analysis allowed to assess the practical usefulness of the adopted model for the air temperature forecasting in the workings of mechanized underground mines in Vietnam. The presented method can be used as a tool for mining services in the fight against the climate threat in underground excavations.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 353--364
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of clinical usefulness of serum neopterin determination in children with bacterial infections
    Autorzy:
    Plata-Nazar, Katarzyna
    Luczak, Grażyna
    Liberek, Anna
    Dudzinska-Gehrmann, Julita
    Sznurkowska, Katarzyna
    Landowski, Piotr
    Kaminska, Barbara
    Powiązania:
    https://bibliotekanauki.pl/articles/1039150.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    neopterin
    children
    urinary tract infections
    Opis:
    Neopterin (NPT) (6-D-erythro-trihydroxypropyl pteridin) is one of the indicators of the immune system activity. Elevated neopterin concentration occurs in diseases mostly involving stimulation of cellular immunity. The determination of neopterin concentration, usually in blood serum and urine but also in many other bodily fluids, has already been applied in many areas of medicine, such as transfusiology, transplantology, oncology, infectious diseases and autoimmunological diseases. Objective. The aim of this work is to evaluate clinical usefulness of serum neopterin determination in children with urinary tract infections of confirmed bacterial etiology. Material. The study involved 56 children with bacterial urinary tract infections - patients of the Clinic of Paediatrics, Paediatric Gastroenterology, Hepatology & Paediatric Nutrition of Medical University of Gdańsk in the years 2012-2013. The control group included 105 healthy children. Results. The values of NPT concentration in blood serum obtained in the group of children with urinary tract infections did not significantly differ from the values obtained in the control group. Conclusions. The determination of neopterin concentration in children with bacterial urinary tract infections is not a clinically useful parameter.
    Źródło:
    Acta Biochimica Polonica; 2015, 62, 1; 133-137
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Helicobacter pylori increases expression of proapoptotic markers Fas and FasL on CD4 lymphocytes in children
    Autorzy:
    Kotłowska-Kmieć, Aldona
    Bąkowska, Alicja
    Szarszewski, Adam
    Kamińska, Barbara
    Łuczak, Grażyna
    Radys, Wojciech
    Landowski, Piotr
    Brodzicki, Jacek
    Korzon, Maria
    Liberek, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/1040535.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    T cell
    H. pylori
    FasL
    Fas
    apoptosis
    lymphocyte
    Opis:
    The pathomechanism of Helicobacter pylori action upon gastric mucosa and its role in the pathogenesis of gastritis have not been fully elucidated. The aim of this study was to evaluate the most prevalent lymphocyte subpopulations of the gastric mucosa in gastritis in children, as well as to evaluate the expression of Fas and Fas ligand receptors (FasL), periapoptotic markers of gastric mucosa lymphocytes before and after H. pylori eradication. Forty nine patients aged 6 to 17 years, investigated due to chronic abdominal pain, were studied. The obtained tissue samples were analysed by immunohistochemistry. Different lymphocyte subsets were quantified on the basis of surface antigen expression (CD3, CD4, CD8, CD20), secreted cytokines (IL-4, IL-6, IFNγ) and Fas and FasL proteins in the gastric mucosa. B and T helper lymphocytes were found to play a major role in the inflammatory infiltration in the gastric mucosa in children during H. pylori infection. Their expression was found to decrease after eradication. The enhanced expression of Fas receptor on lymphocytes before treatment and a decrease of this expression after eradication of H. pylori were shown. It was demonstrated that there is a correlation between CD4 and Fas receptor expression that may induce apoptosis of the helper lymphocytes in infected children.
    Źródło:
    Acta Biochimica Polonica; 2009, 56, 3; 433-438
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transforming growth factor β1 protein and mRNA levels in inflammatory bowel diseases: towards solving the contradictions by longitudinal assessment of the protein and mRNA amounts
    Autorzy:
    Liberek, Anna
    Kmieć, Zbigniew
    Wierzbicki, Piotr
    Jakóbkiewicz-Banecka, Joanna
    Liberek, Tomasz
    Łuczak, Grażyna
    Plata-Nazar, Katarzyna
    Słomińska-Frączek, Magdalena
    Kaszubowska, Lucyna
    Gabig-Cimińska, Magdalena
    Węgrzyn, Alicja
    Powiązania:
    https://bibliotekanauki.pl/articles/1039466.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    Crohn's disease
    ulcerative colitis
    Transforming Growth Factor-β1
    longitudinal assessment of TGF-β1 level
    Opis:
    Previously published studies on levels of the transforming growth factor-β1 (TGF-β1) protein and mRNA of the corresponding gene in patients suffering from inflammatory bowel diseases (IBD) gave varying results, leading to contradictory conclusions. To solve the contradictions, we aimed to assess longitudinally TGF-β1 protein and mRNA levels at different stages of the disease in children suffering from IBD. The study group consisted of 19 pediatric patients with IBD at the age between 3.5 and 18.4 years. The control group consisted of 42 children aged between 2.0 and 18.0 years. The plasma TGF-β1 concentration was measured with ELISA. mRNA levels of the TGF-β1 gene isolated from samples of the intestinal tissue were assessed by reverse transcription and real-time PCR. Levels of TGF-β1 protein in plasma and corresponding mRNA in intestinal tissue were significantly higher in IBD patients than in controls. TGF-β1 and corresponding transcripts were also more abundant in plasma and intestinal tissue, respectively, in patients at the active stage of the disease than during remission. In every single IBD patient, plasma TGF-β1 level and mRNA level in intestinal tissue was higher at the active stage of the disease than during remission. Levels of TGF-β1 and corresponding mRNA are elevated during the active stage of IBD but not during the remission. Longitudinal assessment of this cytokine in a single patient may help to monitor the clinical course of IBD.
    Źródło:
    Acta Biochimica Polonica; 2013, 60, 4; 683-688
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Clinical parameters of inflammatory bowel disease in children do not correlate with four common polymorphisms of the transforming growth factor β1 gene
    Autorzy:
    Liberek, Anna
    Jakóbkiewicz-Banecka, Joanna
    Kloska, Anna
    Świderska, Joanna
    Kmieć, Zbigniew
    Łuczak, Grażyna
    Wierzbicki, Piotr
    Liberek, Tomasz
    Marek, Krzysztof
    Plata-Nazar, Katarzyna
    Sikorska-Wiśniewska, Grażyna
    Kamińska, Barbara
    Węgrzyn, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/1039871.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    pediatric patients
    gene polymorphism
    Transforming growth factor β1
    inflammatory bowel disease
    Opis:
    Transforming growth factor β1 (TGF-β1) is a cytokine affecting cell proliferation and development, which also has an immunomodulatory activity. Correlations between polymorphisms of the TGF-β1 gene and clinical parameters of inflammatory bowel disease (IBD) were reported previously in adults. Here, we tested whether such correlations occur in pediatric patients suffering from IBD. One hundred and four pediatric IBD patients were involved in this study. Among them, 36 were diagnosed with Crohn's Disease (CD) and 68 were diagnosed with ulcerative colitis (UC). The control group consisted of 103 children, in which IBD was excluded. TGF-β1 levels were determined in plasma and intestinal mucosa samples. The presence of the TGF β1 protein and the amount of TGF β1 mRNA were estimated in intestinal mucosa by immunohistochemistry and reverse transcription Real-Time PCR, respectively. Four common polymorphisms of the TGF-β1 gene were investigated: -800G/A, -509C/T, 869T/C and 915G/C. No significant correlation between TGF-β1 genotypes and (i) TGF-β1 levels in plasma and tissue samples, (ii) TGF-β1 gene expression efficiency in intestinal mucosa, (iii) IBD clinical parameters and (iv) inflammatory activity could be detected in children suffering from IBD. We conclude that, contrary to previous suggestions, the four common polymorphisms of the TGF-β1 gene do not influence the susceptibility to or clinical parameters of IBD in the tested population of children.
    Źródło:
    Acta Biochimica Polonica; 2011, 58, 4; 641-644
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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