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    Wyświetlanie 1-49 z 49
    Tytuł:
    “A bit of salt, a bit of pepper, and a bit of irony:” A qualitative analysis of attitudes towards verbal irony in gelotophobes and nongelotophobes
    Autorzy:
    Kałowski, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/2128966.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    verbal irony
    irony understanding
    individual differences
    gelotophobia
    content analysis
    Opis:
    A qualitative study was carried out to survey attitudes towards and feelings associated with verbal irony among gelotophobes and nongelotophobes (gelotophobia denoting the fear of being laughed at). Sixty-one people (13 gelotophobes) were surveyed using an open-ended online questionnaire. An inductive, manifest content analysis was carried out. The analysis distinguished that non-gelotophobes treat verbal irony as a skillful way of drawing attention to absurdity. Irony was also often seen as a personal quality rather than a linguistic form. Concerns with recognizing irony appeared very rarely. In contrast, the gelotophobes’ responses displayed a more negative and one-sided attitude towards irony, describing it mostly as a way to put down and insult. These findings, though obtained in a general exploration, present a perspective complementary to that seen in linguistic and psycholinguistic literature as they draw attention to matters of personal experience of irony use. Additionally, the study’s methodological limitations and further directions for research are discussed.
    Źródło:
    Polish Psychological Bulletin; 2020, 51, 4; 324-334
    0079-2993
    Pojawia się w:
    Polish Psychological Bulletin
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical investigations of pulsatile flow in stenosed artery
    Autorzy:
    Bit, A.
    Chattopadhyay, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/306672.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    płyn nienewtonowski
    przepływ pulsacyjny
    liczby Reynoldsa
    non-Newtonian
    pulsatile
    hemodynamic
    stenoses
    Reynolds number
    oscillatory shear index
    Opis:
    Purpose: Abnormalities in blood vessels by virtue of complex blood flow dynamics is being supported by non-Newtonian behavior of blood. Thus it becomes a focus of research to most of the researchers. Additionally, consideration of real life patient specific model of vessel as well as patient specific inlet flow boundary condition implementation was limited in literature. Thus a thorough implementation of these considerations was done here.Method: In this work, a numerical investigation of hemodynamic flow in stenosed artery has been carried out with realistic pulsating profile at the inlet. Flow has been considered to be laminar due to arresting condition of cardiovascular state of the subject. Two non-Newtonian rheological models namely, Power Law viscosity model and Quemada viscosity model have been used. Two different patient-specific pulsatile profiles are considered at the inlet of a long stenosed artery with varying degree of stenoses from 25% to 80%. Results: Transient form of Navier-Stokes equation is solved in an axi-symmetric domain to calculate the detailed flow structure of the flow field. From the simulation data, temporal and time averaged wall shear stress, oscillatory shear index and pressure drop are calculated. Conclusions: The results demonstrate that oscillatory shear index and wall shear stresses areextensively governed by the degree of stenoses. The position and movement of recirculation bubbles are found to vary with flow Reynolds number.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2014, 16, 4; 33-44
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Adverbialization of Polish Indefinite Quantifiers of Nominal Origin: A Diachronic Study of trochę ‘a bit’, odrobinę ‘a bit’, and masę ‘a lot’
    Autorzy:
    Herda, Damian
    Powiązania:
    https://bibliotekanauki.pl/articles/52801851.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    grammaticalization
    adverbialization
    indefinite (vague) quantifiers of nominal origin
    degree adverbs
    extent modifiers
    Polish
    Opis:
    Based on diachronic data extracted from the available lexicographic sources and historical corpora of Polish, this paper aims at determining whether the initial stage of the adverbialization of indefinite quantifiers of nominal origin typically involves extent modification, degree modification being a posterior development. The results of an investigation into the evolution of the functionalstatusof the commonly used quantifiers trochę ‘a bit’, odrobinę ‘a bit’, as well as masę ‘a lot’ indicate that prior to establishing themselves as degree modifiers, the items function as extent modifiers, i.e. duratives or frequentatives. In their earliest adverbial attestations recorded in the analysed material, the quantifiers under scrutiny modify the duration or frequency of the action denoted by the associated verbal element, or, if the pertinent verb encodes a punctual event, of the resultant state, and only later do they start to combine with scalar predicates, i.e. degree verbs as well as gradable adjectives and adverbs, including adverbials in the form of prepositional phrases. Exceptional in this respect is masę ‘a lot’, as it (still) appears incapable of serving as a degree intensifier.
    Źródło:
    Studies in Polish Linguistics; 2019, 14, 1; 19-42
    1732-8160
    2300-5920
    Pojawia się w:
    Studies in Polish Linguistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low power 9-bit pipelined A/D and 8-bit self-calibrated D/A converters for a DSP system
    Autorzy:
    Wawryn, K.
    Suszynski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/199995.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    current mode circuits
    pipelined a/d converter
    self-calibrating d/a converter
    Opis:
    A low power, low voltage current mode 9 bit pipelined a/d converter and 8 bit self-calibrated d/a converter to interface a DSP system are presented in the paper. The a/d converter is built of 1.5 bit stages with digital error correction logic. The d/a converter is composed of 3 LSBs fine and 5 MSBs coarse current mode converters. The a/d and d/a converters were designed in 0.35 μm technology, then fabricated to verify the proposed concept. The performances of both converters are compared to the performances of known converter structures. The main advantages of the proposed converters are low power consumption and small chip area.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 979-988
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    "Mélange, hotchpotch, a bit of this and a bit of that is how newness enters the world" - Salman Rushdie’s Postcolonial Use of Hybridized Language
    Autorzy:
    Dyła, Joanna
    Powiązania:
    https://bibliotekanauki.pl/articles/600789.pdf
    Data publikacji:
    2007
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Źródło:
    Acta Universitatis Lodziensis. Folia Litteraria Anglica; 2007, 7
    1427-9673
    Pojawia się w:
    Acta Universitatis Lodziensis. Folia Litteraria Anglica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    BBC MICRO:BIT jako narzędzie nowoczesnej edukacji technicznej
    BBC MICRO:BIT as a tool for modern technical education
    Autorzy:
    Szabłowski, Stanisław
    Powiązania:
    https://bibliotekanauki.pl/articles/2197617.pdf
    Data publikacji:
    2021-10-15
    Wydawca:
    Uniwersytet Rzeszowski
    Tematy:
    Micro:bit
    programowanie Micro:bit
    MakeCode
    MicroPython
    Micro:bitprogramming
    Opis:
    Micro:bit to płytka przeznaczona do nauki elektroniki i programowania dla dzieci i młodzieży. W opracowaniu przeprowadzono analizę sprzętową układu oraz środowisk programistycznych. Wskazano na możliwości zastosowania płytki Micro:bit w edukacji STEAM. W zakończeniu zamieszczono komentarze i wnioski praktyczne.
    Micro:bit is a board designed for learning electronics and programming for children and teenagers. The study included a hardware analysis of the system and programming environments. The possibilities of using the Micro:bit board in STEAM education were indicated in the study. The conclusion includes comments and practical inferences.
    Źródło:
    Dydaktyka informatyki; 2021, 16; 168-174
    2083-3156
    2543-9847
    Pojawia się w:
    Dydaktyka informatyki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Utylitarne halucynacje. (Nieco…) O post-fotografowaniu…
    Utilitarian hallucinations. (A bit…) About post-photographing
    Autorzy:
    Bielak, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/29520294.pdf
    Data publikacji:
    2022-12-20
    Wydawca:
    Uniwersytet Bielsko-Bialski
    Tematy:
    photography
    social media
    everyday practices
    fotografia
    praktyki codzienności
    Opis:
    The article discusses the problem of photography created for the needs of social networking sites, which are designed with the help of popular applications on smartphones. The author wonders if this kind of photography is necessary (useful), as it influences the understanding and definition of the culture of participation. The author also tries to answer the question of whether we are still dealing with photography or only with the practice of everyday life - making photos.
    Źródło:
    Świat i Słowo; 2022, 38, 1; 105-116
    1731-3317
    Pojawia się w:
    Świat i Słowo
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Concurrent operation of processors in the bit-byte CPU of a PLC
    Autorzy:
    Chmiel, M.
    Hrynkiewicz, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/969831.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    programmable logic controller
    central processing unit
    bit-byte structure of CPU
    scan time
    throughput time
    concurrent operation
    Opis:
    The paper presents some selected hardware solutions for the PLC dual processor bit-byte CPUs, which are oriented at optimised data exchange between the CPU processors. The optimisation aims at maximum utilisation of capabilities of the two-processor architecture of the CPU. The key point is preserving high speed of instruction processing by the bit-processor, and high functionality of the byte-processor. The structure should enable the processors to work in concurrent mode as far as it is possible, and minimise the situations, when one processor has to wait for the other.
    Źródło:
    Control and Cybernetics; 2010, 39, 2; 559-579
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dyskusja o państwowej służbie geologicznej : trochę historii
    Debate on the Polish Geological Survey : a bit of history
    Autorzy:
    Narkiewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075808.pdf
    Data publikacji:
    2018
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Polska Służba Geologiczna
    reorganizacja
    historia
    Polish Geological Survey
    reorganization
    history
    Opis:
    During the period of intellectualferment in 1980-1981 the "Solidarity” Commitee at the Geological Institute elaborated and proposed main guidelines for a reorganization of the Polish Geological Survey. The project, following wide discussion in the Polish geological community, was designed according to standards implemented in leading Western countries. The proposal assumed that the survey should maintain a high scientific level and ought to be independentfrom any direct political influence or pressure ofeconomic lobbies. While organization details proposed in the "Solidarity” project may be disputable, its general premises remain up to date.
    Źródło:
    Przegląd Geologiczny; 2018, 66, 11; 678--679
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rozlewność mistyczna, czyli o epifanii i symbolu w powieści wczesnomodernistycznej nieco inaczej
    The mystical broadness, or on epiphany and symbol in the early modernistic novel a bit differently
    Autorzy:
    Grzyb, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/1392830.pdf
    Data publikacji:
    2009-01-01
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Opis:
    This article is focused on an epiphany in the novel during the period named “the early modernism”. It shows a different perspective onto aesthetics of the novel, “aesthetics of scream”, because epiphany as a cognitive process related to a symbol is presented there and it brings explanation, why every symbol is an epiphany, but every epiphany is not a symbol. In cognitive experience both as a symbol and an epiphany take place perception and insight.
    Źródło:
    Przestrzenie Teorii; 2009, 12; 239-265
    2450-5765
    Pojawia się w:
    Przestrzenie Teorii
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3R: “In empirical research it’s good to have a bit of luck and then seize the opportunity…”. On the methodology of the “Three Ukrainian Revolutions” research project – an interview with prof. Georges Mink
    Autorzy:
    Pazik, Przemysław
    Powiązania:
    https://bibliotekanauki.pl/articles/943384.pdf
    Data publikacji:
    2017
    Wydawca:
    Ośrodek Pamięć i Przyszłość
    Źródło:
    Wrocławski Rocznik Historii Mówionej; 2017, 7; 491-499
    2719-7522
    2084-0578
    Pojawia się w:
    Wrocławski Rocznik Historii Mówionej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technika eliminacji opóźnień i zmniejszania liczby sumatorów w bitowo-szeregowym układzie mnożącym przez wektor stałych
    Hardware expenditures reduction technique for bit-serial multiplier by a set of fixed constants
    Autorzy:
    Ulacha, G.
    Mąka, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/155568.pdf
    Data publikacji:
    2007
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    układy mnożące przez stałą
    reprezentacja CSD
    przetwarzanie bitowo-szeregowe
    constant multipliers
    CSD representation
    bit-serial processing
    Opis:
    W artykule przedstawiono ideę minimalizacji liczby opóźnień i sumatorów dwuwejściowych bazującą na bitowo-szeregowej linii opóźniającej i wykorzystującą zasadę współdzielenia sumatorów. Dla przedstawionego przykładu zaprojektowania filtru FIR db8 wykazano zasadność proponowanej metody.
    Curtailment of number of delays and two-input adders idea based on bit-serial delay line and sharing adders is presented. Using FIR db8 filter as example, legitimacy of the proposed method has been proved.
    Źródło:
    Pomiary Automatyka Kontrola; 2007, R. 53, nr 7, 7; 133-135
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fałszerze pieprzu Moniki Sznajderman w roli lektury uzupełniającej, czyli jeszcze jedna odsłona prawdy o XX wieku
    Monika Sznajdermans “Pepper Counterfeiters” in the role of supplementary reading – a bit more of the truth about the 20th century
    Autorzy:
    Kania, Agnieszka
    Powiązania:
    https://bibliotekanauki.pl/articles/1075447.pdf
    Data publikacji:
    2021-05-31
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    memory;
    identity;
    Polish language education;
    Polish-Jewish relationships;
    Holocaust;
    critical thinking
    pamięć;
    tożsamość;
    edukacja polonistyczna;
    relacje polsko-żydowskie;
    Zagłada;
    myślenie krytyczne
    Opis:
    Wiedza o relacjach polsko-żydowskich, zwłaszcza w czasie II wojny światowej i Zagłady, jest w polskim społeczeństwie wciąż niewystarczająca i obarczona wieloma stereotypami. Edukacja polonistyczna w obowiązkowym wymiarze nie pozwala na podjęcie tego trudnego tematu, dlatego w liceum warto uczynić lekturą uzupełniającą książkę Moniki Sznajderman Fałszerze pieprzu. Historia rodzinna, opowieść o pamięci i tożsamości. Jej omówienie powinno zostać starannie przemyślane, a uczniowie powinni być przygotowani do odbioru. Metodą w zaproponowanych działaniach dydaktycznych jest przede wszystkim myślenie krytyczne. Tak zinterpretowany utwór daje szansę na wykształcenie w młodych ludziach postawy dystansu wobec narodowych mitów dotyczących relacji polsko-żydowskich i przygotowanie ich do świadomego uczestnictwa w życiu społecznym i kulturalnym.
    Knowledge about Polish-Jewish relations, especially during World War II and the Holocaust, is still insufficient in Polish society and is burdened with many stereotypes. Polish language education in its compulsory dimension does not allow to take up this difficult topic, so in secondary school it is worth to discuss Monika Sznajderman's “Pepper Counterfeiters. A family story” as supplementary book about memory and identity. Its overview should be carefully prepared and the students should be prepared for reception. The method suggested in the proposed didactic activities is primarily critical thinking. Thus interpreted, the literary work gives young people a chance to distance themselves from national myths about Polish-Jewish relations and to prepare them for conscious participation in social and cultural life.
    Źródło:
    Polonistyka. Innowacje; 2021, 13; 173-186
    2450-6435
    Pojawia się w:
    Polonistyka. Innowacje
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Archiwa Jana Lechonia w Nowym Jorku i Kazimierza Wierzyńskiego w Londynie – nieco o historii i niektórych ineditach
    Archives of Jan Lechoń in New York and Kazimierz Wierzyński in London – a bit about history and some inedits
    Autorzy:
    Dorosz, Beata
    Powiązania:
    https://bibliotekanauki.pl/articles/51557731.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Tematy:
    Jan Lechoń
    Kazimierz Wierzyński
    emigration after World War II
    emigrant cultural and literary life
    archives
    literary legacy
    inedita
    scholarly editing
    critical editions
    emigracja po II wojnie światowej
    emigracyjne życie kulturalno-literackie
    archiwa // archiwalia
    spuścizna literacka
    edytorstwo naukowe
    wydania krytyczne
    Opis:
    Artykuł przedstawia historię archiwów Jana Lechonia w Polskim Instytucie Naukowym w Ameryce z siedzibą w Nowym Jorku oraz Kazimierza Wierzyńskiego w Bibliotece Polskiej w Londynie, zwracając uwagę na zasadniczo odmienny sposób ich powstania. Omawia też znajdujące się w obu zespołach inedita, wskazując z jednej strony, dlaczego warte byłyby publikacji po latach, z drugiej – sygnalizując wielorakie problemy, o różnym stopniu trudności, z którymi musiałby zmierzyć się edytor. Dotyczy to nieznanych tekstów Wierzyńskiego z cyklu radiowych gawęd Listy z Ameryki oraz powieści o charakterze autobiograficznym Aurora. Inedita Lechonia to powieść Bal u senatora, znana w niewielkich fragmentach, oraz szkic biograficzno-polityczny o Henryku Floyar-Rajchmanie, czy satyry polityczne pisane w stylu warszawskiego Wiecha. Osobny problem stanowi dziennik Lechonia, którego wydanie krytyczne wymagałoby przede wszystkim ponownego odczytania arcytrudnego rękopisu.
    The article presents the history of the archives of Jan Lechoń at the Polish Institute of Arts and Sciences of America, based in New York, and Kazimierz Wierzyński at the Polish Library in London, noting the fundamentally different way in which they were created. It also discusses the inedita found in both collections, pointing out, on the one hand, why they would be worthy of publication years later, and on the other, signaling the multiple problems, of varying degrees of difficulty, that an editor would have to face. This applies to the unknown texts of Wierzyński’s series of radio storytelling Listy z Ameryki [Letters from America] and the autobiographical novel Aurora. Lechoń’s inedita include the novel Bal u senatora, known in small fragments, and a biographical and political sketch about Henryk Floyar-Rajchman, or political satires written in the style of Warsaw’s Wiech. A separate problem is Lechoń’s diary, a critical edition of which would require, first of all, a rereading of the extremely difficult manuscript.
    Źródło:
    Acta Universitatis Lodziensis. Folia Litteraria Polonica; 2023, 67, 2; 243-275
    1505-9057
    2353-1908
    Pojawia się w:
    Acta Universitatis Lodziensis. Folia Litteraria Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of efficiency of drilling of large-diameter wells with a profiled wing bit
    Badania efektywności wiercenia studni wielkośrednicowych świdrem skrawającym z profilowanymi skrzydłami
    Autorzy:
    Macuda, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/219494.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wiercenie studni
    świder skrawający
    odwodnienie górotworu
    technologia wiercenia
    drilling wells
    cutter bit
    dewatering of rock mass
    drilling technology
    Opis:
    In Poland all lignite mines are dewatered with the use of large-diameter wells. Drilling of such wells is inefficient owing to the presence of loose Quaternary and Tertiary material and considerable dewatering of rock mass within the open pit area. Difficult geological conditions significantly elongate the time in which large-diameter dewatering wells are drilled, and various drilling complications and break-downs related to the caving may occur. Obtaining higher drilling rates in large-diameter wells can be achieved only when new cutter bits designs are worked out and rock drillability tests performed for optimum mechanical parameters of drilling technology. Those tests were performed for a bit ø 1.16 m in separated macroscopically homogeneous layers of similar drillability. Depending on the designed thickness of the drilled layer, there were determined measurement sections from 0.2 to 1.0 m long, and each of the sections was drilled at constant rotary speed and weight on bit values. For finding the dependence of the rate of penetration on weight on bit and rotary speed of bit various regression models have been analyzed. The most satisfactory results were obtained for the exponential model illustrating the influence of weight on bit and rotary speed of bit on drilling rate. The regression coefficients and statistical parameters prove the good fit of the model to measurement data, presented in tables 4-6. Industrial tests were performed for assessing the efficiency of drilling of large-diameter wells with a cutter bit having profiled wings ø 1.16 m according to elaborated model of average rate of drilling. The obtained values of average rate of drilling during industrial tests ranged from 8.33×10-4 to 1.94×10-3 m/s and were higher than the ones obtained so far, i.e. from 181.21 to 262.11%.
    W Polsce wszystkie odkrywkowe kopalnie węgla brunatnego odwadniane są za pomocą studni wielkośrednicowych. Ich wiercenie jest mało efektywne ze względu na występowanie w profilu luźnych utworów czwarto i trzeciorzędowych oraz znaczne odwodnienie górotworu, które jest jedną z głównych przyczyn obwałów ściany otworów i tym samym powstawania trudnych do usunięcia awarii wiertniczych. W celu uzyskania większych prędkości wiercenia wielkośrednicowych studni odwadniających opracowano nową konstrukcję świdra skrawającego i wykonano w warunkach przemysłowych testy zwiercalności. Testy te wykonano dla świdra o średnicy 1,16 m w wydzielonych warstwach makroskopowo jednorodnych, charakteryzujących się zbliżoną zwieralnością. W zależności od projektowanej miąższości przewiercanej warstwy, wyznaczano odcinki pomiarowe o długości od 0,2 do 1,0 m, a każdy odcinek pomiarowy był wiercony przy stałych wartościach prędkości obrotowej i nacisku osiowego na świder. Dla znalezienia zależności mechanicznej prędkości wiercenia od nacisku osiowego i prędkości obrotowej świdra dla wydzielonych warstw makroskopowo jednorodnych, przeanalizowano różne modele regresyjne. Najbardziej zadawalające wyniki uzyskano dla potęgowego modelu wpływu nacisku osiowego i prędkości obrotowej świdra na prędkość wiercenia. Współczynniki regresji i parametry statystyczne potwierdzające bardzo dobre dopasowanie modelu do danych pomiarowych przedstawiono w tabelach 4-6. Dla dokonania oceny efektywności wiercenia wielkośrednicowych studni odwadniających świdrem skrawającym z profilowanymi skrzydłami o średnicy 1,16 według opracowanego modelu średniej prędkości wiercenia wykonano próby przemysłowe. Uzyskane wartości średniej prędkości wiercenia zawierały się w przedziale od 8,33×10-4 do 1,94×10-3 m/s i były wyższe od dotychczas uzyskiwanych od 181,21 do 262,11%.
    Źródło:
    Archives of Mining Sciences; 2012, 57, 2; 363-373
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sieć wytrzyma wszystko. Trochę o niszach muzycznych i nadmiarze dźwiękowym w dystrybucji cyfrowej
    The network will withstand anything; a little bit on music niches and excess sound in digital distribution
    Autorzy:
    Nożyński, Szymon
    Powiązania:
    https://bibliotekanauki.pl/articles/520772.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
    Tematy:
    nisze
    dystrybucja cyfrowa
    długi ogon
    muzyka popularna
    metal music studies
    internet
    niches
    digital distribution
    long tail
    popular music
    the Internet
    Opis:
    W artykule starano się przedstawić uwikłanie niszowej muzyki w cyfrową dystrybucję dźwięku. XXI wiek miał być wiekiem nisz – w koncepcji „długiego ogona”. Jak funkcjonuje muzyka niszowa w sytuacji powszechnego dostępu, wszystkożerności oraz kultury nadmiaru? Czy słuchacz docenia możliwość korzystania z ogromnej bazy muzycznej, czy też zagubiony próbuje korzystać ze wskazań algorytmu; jakie są jego preferencje; czy słucha wyselekcjonowanej muzyki (gatunku, wykonawcy)? A może muzyka jest dla niego nieprzerwanym potokiem dźwięku, traktowanym niezwykle funkcjonalnie.
    The article attempts to present the entanglement of niche music in the digital distribution of sound. The 21st century was supposed to be the age of niches – in accordance with the concept of a “long tail”. How does niche music function in a situation of universal access, omnivorousness and culture of excess? Does the listener appreciate the possibility of using a huge musical base or does the lost listener try to use the indications of the algorithm; what are his preferences; is he listening to selected music (genre, performer)? Or perhaps, music is for him an uninterrupted stream of sound, treated in an incredibly functional way.
    Źródło:
    Annales Universitatis Paedagogicae Cracoviensis. Studia de Cultura; 2019, 11, 3 "Kultura metalowa w przestrzeni rytualnej i medialnej"; 106-117
    2083-7275
    Pojawia się w:
    Annales Universitatis Paedagogicae Cracoviensis. Studia de Cultura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    „Trochę za późno i za mało ale coś jest”. Polacy w Galicji wobec Aktu 5 listopada 1916 r.
    “A bit too late and too little, but at least it’s something”. Poles in Galicia’s attitudes towards the Act of 5th November 1916
    Autorzy:
    Szymczak, Damian
    Powiązania:
    https://bibliotekanauki.pl/articles/2164442.pdf
    Data publikacji:
    2017-06-30
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    pierwsza wojna światowa
    Austro-Węgry
    kwestia polska
    Galicja
    World War I
    Austria-Hungary
    the Polish cause
    Galicia (Eastern Europe)
    Opis:
    The outbreak of WWI offered hope to Poles from Eastern Europe’s Galicia that the so-called Austria-Poland solution would ensue. In the face of military and political weakness of Austria-Hungary, the idea failed to take root. The proclamation of the Act of 5th November 1916 indicated that the Polish state would be reconstructed under the auspices of the Second Reich. This arouse resentment among Poles living in Galicia who had hoped to be united with their compatriots in the Kingdom of Poland. During the outbreak of WWI, a majority of Poles in Galicia were in favour of the Austria-Poland solution. They hoped that once the Kingdom of Poland was taken away from Russia, Franz Joseph I would become the king of Poland. As a result, a new and powerful state would emerge: Austria-Hungary-Poland. In order to pursue this idea, Poles established the Supreme National Committee and the Polish Legions, a military force. Austria’s military defeats and general weakness of the monarchy put an end to these plans as the politicians in Vienna failed to be equally willing to pursue the solution. The initiative regarding the Polish cause was taken over by Germans and the Act of 5th November was proclaimed. This indicated that the reconstruction of the Polish state would be modelled by the Reich rather than the Habsburg monarchy. On the one hand, the proclamation of the Act of 5th November was welcomed in Galicia: it was the first document taking the Polish cause to the international arena. On the other hand, the end of the Austria-Poland idea led to resentment. Poles in Galicia were afraid that they would be left outside the new Polish state.
    Źródło:
    Historia Slavorum Occidentis; 2017, 2 (13); 85-101
    2084-1213
    Pojawia się w:
    Historia Slavorum Occidentis
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A queda de um dos muros: os impérios também perecem (um pouco de geografia, de história, e conjuntura atual)
    The Fall of the Walls: The Empires also Perish (a Little Bit of Geography, History and Current Situation)
    Autorzy:
    ALMEIDA RESENDE, Paulo-Edgar
    Powiązania:
    https://bibliotekanauki.pl/articles/486190.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
    Tematy:
    Andrzej Dembicz
    Europa Centro-Oriental
    Muro de Berlim
    Central-Eastern Europe
    Berlin Wall
    Opis:
    This text is intended as a tribute to André Dembicz, a respected scholar who maintained a constant exchange with university centers in Latin America and with international institutions concerned with Latin America. Without holding Eu-rocentric stereotypes of the world, Dembicz belongs to the limited group of intellectuals who value the exchange of academic analysis between colleagues in Latin America and those in Central Eastern Europe. I found in CESLA, under his direction, a space for ref-lection about the transition from a society ruled by the Plan and the one-party govern-ment, to a society ruled by the economic market and experimenting with multiparty sys-tem. As a token of my appreciation, I have elaborated the present article in tribute to André Dembicz. Before the ruins of the Berlin Wall, I take a moment to reflect. The big question lies in the interpretation of its fall. There are several question marks. Has all the rubble been removed? What has been built in its place: only one world, in which old rivals join in partnership, a grand negotiation? Or two different worlds? In the specific case of the Central-Eastern Europe, which is the main focus of this article, what resulted from the reestablishment of the relationship with Western Europe? In the current enlargement process, where are Central and Eastern European Countries (CEEC: Poland, Check Re-public, Slovakia, Lithuania, Latvia, Estonia, Hungary, Bulgary, Romenia) going? Are they merely co-operators or fundamental protagonists? I will reflect on these highly to-pical issues.
    O presente texto é introduzido com homenagem a André Dembicz, respeitável scholar, que manteve constante intercâmbio com centros universitários da América Latina e com instituições internacionais, voltadas para a América Latina. Sem abrigar estereótipos eurocêntricos de mundo, Dembicz faz parte de seleto grupo de intelectuais, que valoriza o cruzamento de análises de acadêmicos latino-americanos com colegas da Europa Centro-Oriental. Encontrei no CESLA, por ele dirigido, espaço de reflexão sobre a transição de sociedade regida pelo Plano e partida únicos, para sociedade regida pela economia de mercado e que experimenta o pluripartidarismo. É com tal débito, que elaborei o presente texto em homenagem a André Dembicz. Reflito diante dos destroços do muro de Berlim. A grande questão é interpretar sua queda. Há muitas interrogações. Foram retirados todos os escombros? O que se construiu no lugar: um só mundo, em que antigos rivais se engajam em parceria, em grande negociação? Ou dois outros mundos? No caso especìfico da Europa Centro-Oriental, foco principal do presente texto, o que resultou do reatamento das relações com a Europa Ocidental? No atual processo de alargamento, para onde estão indo os Paìses da Europa Central e Oriental (PECO: Polônia, República Tcheca, Eslováquia, Lituânia, Letônia, Estônia, Hungria, Bulgária, Romênia)? São simples coadjuvantes ou protagonistas fundamentais? Vou refletir a respeito destas candentes questões.
    Źródło:
    Revista del CESLA. International Latin American Studies Review; 2010, 1, 13; 87-101
    1641-4713
    Pojawia się w:
    Revista del CESLA. International Latin American Studies Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of zero and non-zero boresight pointing errors on bit-error rate free-space optic transmission over Málaga atmospheric channel
    Autorzy:
    Smilić, M.
    Perić, Z.
    Milić, D.
    Marković, A.
    Savić, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/173446.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    free-space optic system
    FSO
    Málaga atmospheric turbulence channel
    zero boresight pointing error
    non-zero boresight pointing error
    average bit-error-rate
    ABER
    Opis:
    In this paper, the influence of a zero and a non-zero boresight pointing errors on the performances of free-space optic transmission over the Málaga atmospheric turbulence channel is considered. Closed form expressions for a zero boresight channel model probability density function, non-zero boresight channel model probability density function, as well as a bit-error rate over a binary phase shift keying modulation transmission are provided. Numerical results for zero and non-zero boresight pointing errors are graphically presented.
    Źródło:
    Optica Applicata; 2018, 48, 2; 179-189
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study of layouts of PDC cutters in core bit drilling
    Autorzy:
    Buitrago Gomez, L. A.
    Miska, S. Z.
    Ziaja, M. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/299255.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    PDC cutter
    cutters layout
    PDC bit
    coring
    drilling efficiency
    Opis:
    Over the past two decades, various single cutter force models have been developed that consider formation properties and bit characteristics. These models have been extensively used to describe the interaction of a Polycrystalline Diamond Compact (PDC) bit with formation rocks; however, their use to predict bit drilling efficiency is usually inadequate. There is an ample of field evidence that the density and layouts of PDC cutters affect drilling efficiency. Still, however, there is no reliable model of the PDC bit performance allowing determination of these bit design features for a specific bit's applications. In order to better understand the relationship between rock properties and PDC cutter layouts for different bit applications, laboratory drilling tests were performed with PDC core bits. The concept of an eight-blade PDC core bit was used to build a bit with a common body and replaceable heads. Core-bit design features such as: bit, cutter size, and cutter geometry were constant. In this study, the full-scale test rig facility at the University of Tulsa was used to obtain consistent data for six different layouts of PDC cutters. Operating parameters, such as the rate per minute (RPM) and weight on bit (WOB), were varied and performance parameters (rate of penetration (ROP) and bit torque (TQB)), were measured at each time step with the frequency of 10 Hz. The ROP were calculated as a function of bit displacement over time. All operating parameters were recorded as part of the data acquisition platform. Depth of Cut (DOC) was calculated from ROP, and the average WOB and TQB were estimated at each depth of cut. Tests were performed on two different rocks: Bedford and Carthage Limestones. For the purpose of comparing performance among different cutter layouts, we experiment with a maximum of four different depths of cut, which corresponded to four different weights on bit. The tested layouts allowed a constant maximum DOC per cutter of 0.25 in. Water was the drilling fluid for the entire experimental phase. The results showed that under the same drilling parameters, the cutter layout plays a key role in drilling efficiency. Strong linear relationships were found between DOC, WOB and TQB at different conditions that were characteristic of the specific bit design. Also, the PDC cutter layouts affected the relative drilling performance differently for different rock properties.
    Źródło:
    AGH Drilling, Oil, Gas; 2016, 33, 2; 341-360
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Projekt 7-bitowego niskomocowego przetwornika A/C w technologii submikronowej o małej powierzchni do zastosowań wielokanałowych
    Design of 7-bit low-power , low area A/D converter in submicron process for multichannel systems
    Autorzy:
    Otfinowski, P.
    Kmon, P.
    Kleczek, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/407805.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    przetwornik analogowo-cyfrowy
    równoważenie ładunku
    przetwornik kompensacyjny
    SAR ADC
    charge redistribution
    successive approximation converter
    Opis:
    W artykule został przedstawiony projekt przetwornika analogowo-cyfrowego w technologii CMOS 180nm. Wybraną architekturą jest przetwornik kompensacyjny z równoważeniem ładunku. Duży nacisk został położony na zmniejszenie zajmowanej powierzchni jak i minimalizację poboru mocy, co czyni prezentowany układ odpowiednim do zastosowań wielokanałowych. Autorzy prezentują wyniki symulacji Monte-Carlo nieliniowości charakterystyki przejściowej. Zaprezentowany przetwornik osiąga szybkość konwersji 3 MS/s przy rozdzielczości 7 bitów i poborze mocy 77 μW oraz zajmuje tylko 90 x 95 μm2.
    The design of analog-to-digital converter implemented in CMOS 180 nm technology has been presented in this paper. The successive approximation architecture with charge redistribution has been chosen. Much emphasis was placed on limiting the area occupancy of the whole chip so as its power consumption, which makes the described circuit suitable for multichannel applications. The presented converter achieves 3 MS/s sampling rate with 7-bit resolution at 77 μW and occupies only 90 x 95 μm2.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2013, 2; 18-21
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Audio Compression using a Modified Vector Quantization algorithm for Mastering Applications
    Autorzy:
    Prince, Shajin
    D, Bini
    Kirubaraj, Alfred A.
    Immanuel, Samson J.
    M, Surya
    Powiązania:
    https://bibliotekanauki.pl/articles/27311916.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    vector quantization
    scalable
    perceptual coder
    audio mastering
    bit stream
    Opis:
    Audio data compression is used to reduce the transmission bandwidth and storage requirements of audio data. It is the second stage in the audio mastering process with audio equalization being the first stage. Compression algorithms such as BSAC, MP3 and AAC are used as standards in this paper. The challenge faced in audio compression is compressing the signal at low bit rates. The previous algorithms which work well at low bit rates cannot be dominant at higher bit rates and vice-versa. This paper proposes an altered form of vector quantization algorithm which produces a scalable bit stream which has a number of fine layers of audio fidelity. This modified form of the vector quantization algorithm is used to generate a perceptually audio coder which is scalable and uses the quantization and encoding stages which are responsible for the psychoacoustic and arithmetical terminations that are actually detached as practically all the data detached during the prediction phases at the encoder side is supplemented towards the audio signal at decoder stage. Therefore, clearly the quantization phase which is modified to produce a bit stream which is scalable. This modified algorithm works well at both lower and higher bit rates. Subjective evaluations were done by audio professionals using the MUSHRA test and the mean normalized scores at various bit rates was noted and compared with the previous algorithms.
    Źródło:
    International Journal of Electronics and Telecommunications; 2023, 69, 2; 287--292
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of noise, a constant background, and bit depth on the phase retrieval of pure phase objects
    Autorzy:
    Karitans, Varis
    Tokmakovs, Andrejs
    Antonuka, Adele
    Powiązania:
    https://bibliotekanauki.pl/articles/1835795.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    phase retrieval
    phase problem
    diffraction
    Opis:
    In the current study, we investigate the effect of uniform white noise, Poisson noise and a constant background on the phase retrieval of pure phase objects. We also study the influence of the aforementioned factors on phase retrieval at different bit depths of intensity measurements. An algorithm called PhaseLift is used for phase retrieval as it requires a small number of modulating masks and can retrieve the phase of an object from sparse intensity measurements of low bit depth. A test object is modulated by eight random masks generated from a single mask and the phase of the object is retrieved from coded diffraction patterns. Different levels of uniform white noise, Poisson noise and constant background are superimposed on the diffraction patterns and the root-mean-square error (RMSE) of the retrieved object is calculated at each level. The results suggest that Poisson noise and a constant background at the same level cause similar RMSE compared to uniform white noise. Lowering the bit depth from 18-bits to 14-bits resulted in the decrease of the RMSE caused by Poisson noise and a constant background. We conclude that the effects of noise and constant background can be reduced by lowering the bit depth.
    Źródło:
    Optica Applicata; 2021, 51, 2; 257-269
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Different Transfer Functions for Optical Limiting Amplifier used in a 2R Burst Mode Optical Regenerator
    Autorzy:
    Deodhar, Yash
    Reddy, Jeeru Jaya Sankar
    Kakade, Priyanka Desai
    Kakade, Rohan
    Powiązania:
    https://bibliotekanauki.pl/articles/1844502.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optical limiting amplifier
    burst mode
    ASE noise
    nonlinearity
    bit error rate
    optical regeneration
    Opis:
    The major difference between a continuous mode optical regenerator (CMOR) and a burst mode optical regenerator (BMOR) is that a BMOR is capable of handling large variations in the input power which makes it useful in optical packet switched and optical burst switched networks. This is due to the optical limiting amplifier (OLA) present in the BMOR. Using computer modelling, the impact of using different OLA non-linear transfer functions on the output bit error rate of a system consisting of a cascade of 2R BMORs has been investigated. The effect of amplified spontaneous emission (ASE) noise introduced in the inter-regenerator links has also been taken into consideration. Also, a brief review of existing OLA designs is presented.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 3; 409-416
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A 1.67 pJ/Conversion-step 8-bit SAR-Flash ADC Architecture in 90-nm CMOS Technology
    Autorzy:
    Khatak, Anil
    Kumar, Manoj
    Dhull, Sanjeev
    Powiązania:
    https://bibliotekanauki.pl/articles/1844527.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    analog to digital converter
    ADC
    successive approximation register (SAR)
    common mode current feedback gain boosting
    CMFD-GB
    residue amplifier
    RA
    spurious free dynamic range
    SFDR
    integral nonlinearity
    INL
    differential nonlinearity
    DNL
    Opis:
    A novice advanced architecture of 8-bit analog to digital converter is introduced and analyzed in this paper. The structure of proposed ADC is based on the sub-ranging ADC architecture in which a 4-bit resolution flash-ADC is utilized. The proposed ADC architecture is designed by employing a comparator which is equipped with common mode current feedback and gain boosting technique (CMFD-GB) and a residue amplifier. The proposed 8 bits ADC structure can achieve the speed of 140 mega-samples per second. The proposed ADC architecture is designed at a resolution of 8 bits at 10 MHz sampling frequency. DNL and INL values of the proposed design are -0.94/1.22 and -1.19/1.19 respectively. The ADC design dissipates a power of 1.24 mW with the conversion speed of 0.98 ns. The magnitude of SFDR and SNR from the simulations at Nyquist input is 39.77 and 35.62 decibel respectively. Simulations are performed on a SPICE based tool in 90 nm CMOS technology. The comparison shows better performance for this proposed ADC design in comparison to other ADC architectures regarding speed, resolution and power consumption.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 3; 347-354
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pseudo-random bit generators based on linear-feedback shift registers in a programmable device
    Autorzy:
    Parol, M.
    Dąbal, P.
    Szplet, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/114462.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    pseudo-random bit generators
    linear-feedback shift register
    programmable device
    Opis:
    We present the results of comparative study on three pseudo-random bit generators (PRBG) based on various use of linear-feedback shift registers (LFSR). The project was focused on implementation and tests of three such PRBG in programmable device Spartan 6, Xilinx. Tests of the designed PRBGs were performed with the use of standard statistical tests NIST SP800-22.
    Źródło:
    Measurement Automation Monitoring; 2016, 62, 6; 184-186
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Konwencja singapurska a rozwiązywanie sporów inwestycyjnych
    Autorzy:
    Kożuch, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/2216587.pdf
    Data publikacji:
    2021-04-27
    Wydawca:
    Uniwersytet Warszawski. Wydawnictwo Naukowe Wydziału Zarządzania
    Tematy:
    arbitraż
    mediacja
    konwencja singapurska
    rozwiązywanie sporów
    ADR
    inwestycje
    BIT
    Opis:
    Międzynarodowa przestrzeń prawna wzbogaciła się w roku 2020 nowym instrumentem prawnym, jakim jest konwencja singapurska o mediacji. Jej zastosowanie w polubownym rozwiązywaniu sporów zależne jest od aktywności państw oraz UE, które mogą do niej przystąpić lub pozostać poza obszarem jej oddziaływania. Na rynku prawnym UE po wydaniu przez TSUE orzeczenia C-284/16 wejście w życie konwencji mogłoby uzupełnić przestrzeń o instrument, który spełnia podobne cele do orzecznictwa sądów arbitrażowych w sprawach inwestycyjnych. Przejecie tego instrumentu wymaga jednak myślenia poza dotychczasowym schematem rozwiązań prawnych.
    Źródło:
    internetowy Kwartalnik Antymonopolowy i Regulacyjny; 2021, 10, 3; 91-107
    2299-5749
    Pojawia się w:
    internetowy Kwartalnik Antymonopolowy i Regulacyjny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modułowy, 32-bitowy sterownik pralki
    Modular, 32-bit washing machine controller
    Autorzy:
    Milecki, A.
    Pittner, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/276628.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    mikrokontroler
    pralka
    sterownik pralki
    microcontroller
    washing machine controller
    Opis:
    W artykule przedstawiono podstawowe elementy stosowane w pralkach domowych. Opisano krótko sposób ich działania oraz obsługi przez sterownik. W dalszej części przedstawiono koncepcję własnego sterownika pralki zbudowanego na bazie mikrokontrolera 32-bitowego z rodziny STM32 [1, 2, 3, 4]. Opisano jego budowę, a szczególną uwagę zwrócono na komunikację oraz oprogramowanie.
    In the paper the basic elements used in house washing machines are presented. The principle of their operation are shortly described. In the next part of the paper authors own conception of new washing machine controller construction is presented. The proposed controller is based on 32-bit STM32 microcontroller. The controller design was described. A special attention was given to the worked out software.
    Źródło:
    Pomiary Automatyka Robotyka; 2012, 16, 2; 357-361
    1427-9126
    Pojawia się w:
    Pomiary Automatyka Robotyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transmitter Inclination Angle Characteristics for Underwater Optical Wireless Communication in a Variety of APD Detectors
    Autorzy:
    Mazin, Ali A. Ali
    Powiązania:
    https://bibliotekanauki.pl/articles/1192197.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Communications
    Underwater Optical Communications
    Avalanche Photodiode
    Bit Error Rate
    Channel Capacity
    Opis:
    In this paper, the performance of an underwater optical wireless communications system is theoretically analyzed, using 4-PPM modulation technique and an avalanche photodiodes APD receiver over underwater environment channels. Based on the line of sight (LOS) geometrical model for optical beam propagation horizontally on an underwater medium and combined with signal to noise ratio model for Si, Ge and InGaAs APD and BER; then the impacts of the distance of transmission, power of the transmitter under Jerlov water types (I, IA, IB) are analyzed. The characteristics of bit error rate BER and channel capacity for 4-PPM optical modulation technique are studied under different APD detector and Jerlov water types. Simulation results indicate that the performance of PPM and Jerlov type (I) are more suited for an underwater optical wireless communication. On the other hand, we discuss the suitability of avalanche photodiodes under this modulation technique, where the photodiode Si APD has more advantage compared with the other detectors when used as a receiver in an underwater optical communication.
    Źródło:
    World Scientific News; 2016, 45, 2; 355-372
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generating Pseudorandom S-Boxes - a Method of Improving the Security of Cryptosystems Based on Block Ciphers
    Autorzy:
    Mroczkowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/308900.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    block cipher
    pseudorandom bit generator
    substitution box (S-box)
    Opis:
    The paper presents a general framework for improving the security of the cryptosystem based on the symmetric block cipher. The main idea is based on possibility of chancing substitution boxes (called S-boxes) in encryption/decryption algorithm. In order to make it possible, it is necessary to generate identical boxes by an encryption and decryption party. This is the main reason, why deterministic methods of generating substitution boxes based on the pseudorandom sequences will be presented.
    Źródło:
    Journal of Telecommunications and Information Technology; 2009, 2; 74-79
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PAPR reduction using a combination between precoding and non-liner companding techniques for ACO-OFDM-based VLC systems
    Autorzy:
    Mohammed, N. A.
    Elnabawy, M. M.
    Khalaf, A. A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818214.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    visible light communication
    light emitting diode
    peak-to-average power ratio
    bit error rate
    Opis:
    Peak-to-average power ratio reduction techniques for visible light communication broadcasting systems are designed, simulated, and evaluated in this work. The proposed techniques are based on merging non-linear companding techniques with precoding techniques. This work aims to nominate an optimum novel scheme combining the low peak-to-average power ratio with the acceptable bit error rate performance. Asymmetrically clipped optical orthogonal frequency division multiplexing with the low peak-to-average power ratio performance becomes more attractive to real-life visible light communication applications due to non-linearity elimination. The proposed schemes are compared and an optimum choice is nominated. Comparing the presented work and related literature reviews for peak-to-average power ratio reduction techniques are held to ensure the proposed schemes validity and effectiveness.
    Źródło:
    Opto-Electronics Review; 2021, 29, 2; 59--70
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PAPR reduction using a combination between precoding and non-liner companding techniques for ACO-OFDM-based VLC systems
    Autorzy:
    Mohammed, N. A.
    Elnabawy, M. M.
    Khalaf, A. A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818217.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    visible light communication
    light emitting diode
    peak-to-average power ratio
    bit error rate
    Opis:
    Peak-to-average power ratio reduction techniques for visible light communication broadcasting systems are designed, simulated, and evaluated in this work. The proposed techniques are based on merging non-linear companding techniques with precoding techniques. This work aims to nominate an optimum novel scheme combining the low peak-to-average power ratio with the acceptable bit error rate performance. Asymmetrically clipped optical orthogonal frequency division multiplexing with the low peak-to-average power ratio performance becomes more attractive to real-life visible light communication applications due to non-linearity elimination. The proposed schemes are compared and an optimum choice is nominated. Comparing the presented work and related literature reviews for peak-to-average power ratio reduction techniques are held to ensure the proposed schemes validity and effectiveness.
    Źródło:
    Opto-Electronics Review; 2021, 29, 2; 59--70
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hybrid PAPR reduction schemes for different OFDM-based VLC systems
    Autorzy:
    El-Ganiny, Mohamed Y.
    Khalaf, Ashraf A. M.
    Hussein, Aziza I.
    Hamed, Hesham F. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2174839.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    visible light communication
    peak-to-average power ratio
    bit error rate
    Opis:
    Orthogonal frequency division multiplexing has been widely used in many radio frequency wireless communication standards as a preferable multicarrier modulation scheme. The modulated signals of a conventional orthogonal frequency division multiplexing system are complex and bipolar. In intensity-modulated direct detection optical wireless communications, transmitted signals should be real and unipolar due to non-coherent emissions of an optical light emitting diode. In this paper, different hybrid optical systems have been proposed to satisfy real and unipolar signals. Peak-to-average power ratio is one of the biggest challenges for orthogonal frequency division multiplexing-based visible light communications. They are based on a combination of non-linear companding techniques with spreading or precoding techniques. Simulation evaluation is performed under direct current-biased optical orthogonal frequency division multiplexing, asymmetrically clipped optical orthogonal frequency division multiplexing, and Flip-orthogonal frequency division multiplexing systems in terms of peak-to-average power ratio, bit error rate, and spectral efficiency. The proposed schemes are investigated to determine a scheme with a low peak-to-average power ratio and an acceptable bit error rate. MATLABTM software has been successfully used to show the validity of the proposed schemes.
    Źródło:
    Opto-Electronics Review; 2022, 30, 3; art. no. e141951
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hybrid PAPR reduction schemes for different OFDM-based VLC systems
    Autorzy:
    El-Ganiny, Mohamed Y.
    Khalaf, Ashraf A. M.
    Hussein, Aziza I.
    Hamed, Hesham F. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2174840.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    visible light communication
    peak-to-average power ratio
    bit error rate
    Opis:
    Orthogonal frequency division multiplexing has been widely used in many radio frequency wireless communication standards as a preferable multicarrier modulation scheme. The modulated signals of a conventional orthogonal frequency division multiplexing system are complex and bipolar. In intensity-modulated direct detection optical wireless communications, transmitted signals should be real and unipolar due to non-coherent emissions of an optical light emitting diode. In this paper, different hybrid optical systems have been proposed to satisfy real and unipolar signals. Peak-to-average power ratio is one of the biggest challenges for orthogonal frequency division multiplexing-based visible light communications. They are based on a combination of non-linear companding techniques with spreading or precoding techniques. Simulation evaluation is performed under direct current-biased optical orthogonal frequency division multiplexing, asymmetrically clipped optical orthogonal frequency division multiplexing, and Flip-orthogonal frequency division multiplexing systems in terms of peak-to-average power ratio, bit error rate, and spectral efficiency. The proposed schemes are investigated to determine a scheme with a low peak-to-average power ratio and an acceptable bit error rate. MATLABTM software has been successfully used to show the validity of the proposed schemes.
    Źródło:
    Opto-Electronics Review; 2022, 30, 3; art. no. e141951
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PAPR reduction using a combination between precoding and non-liner companding techniques for ACO-OFDM-based VLC systems
    Autorzy:
    Mohammed, Nazmi A.
    Elnabawy, M. M.
    Khalaf, Ashraf A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818212.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    visible light communication
    light emitting diode
    peak-to-average power ratio
    bit error rate
    Opis:
    Peak-to-average power ratio reduction techniques for visible light communication broadcasting systems are designed, simulated, and evaluated in this work. The proposed techniques are based on merging non-linear companding techniques with precoding techniques. This work aims to nominate an optimum novel scheme combining the low peak-to-average power ratio with the acceptable bit error rate performance. Asymmetrically clipped optical orthogonal frequency division multiplexing with the low peak-to-average power ratio performance becomes more attractive to real-life visible light communication applications due to non-linearity elimination. The proposed schemes are compared and an optimum choice is nominated. Comparing the presented work and related literature reviews for peak-to-average power ratio reduction techniques are held to ensure the proposed schemes validity and effectiveness.
    Źródło:
    Opto-Electronics Review; 2021, 29, 2; 59--70
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ASIC implementation of high efficiency 8-bit 'OctaLynx' RISC microprocessor
    Implementacja 8-bitowego mikroprocesora "OctaLynx" typu RISC w układzie ASIC
    Autorzy:
    Frankiewicz, M.
    Gał, R.
    Gołda, A.
    Brzozowski, I.
    Kos, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/158713.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
    Tematy:
    mikrokontroler
    RISC
    ASIC
    CMOS
    liczniki
    USART
    SPI
    Verilog
    microcontroller
    imers/Counters
    Opis:
    The paper presents structure of 8-bit RISC microcontroller with 16-bit address bus called OctaLynx. The processor behavior is described by Verilog hardware description language and was fabricated as ASIC in CMOS LF 0.15 m (1.8 V) technology. Before fabrication FPGA tests were run. The integrated circuit consists of the core and some peripherals (8-bit general purpose input-output ports, timers/counters, USART, SPI).The controller was designed for tests of the dynamic power management systems.
    Artykuł prezentuje strukturę 8-bitowego mikrokontrolera typu RISC z 16-bitową magistralą adresową nazwanego OctaLynx. Procesor został zaprojektowany z użyciem języka opisu sprzętu Verilog oraz sfabrykowany jako układ ASIC w technologii CMOS LF 0,15 m (1,8 V). Przed fabrykacją wykonane zostały testy w układzie FPGA. Zbudowany układ scalony składa się z jądra i peryferiów (8-bitowych portów I/O, liczników, SPI, USART). Kontroler przeznaczony jest do testów systemów dynamicznego zarządzania mocą w układzie.
    Źródło:
    Prace Instytutu Elektrotechniki; 2012, 260; 241-253
    0032-6216
    Pojawia się w:
    Prace Instytutu Elektrotechniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modulation-Mode Assignment in SVD-Aided Downlink Multiuser MIMO-OFDM Systems
    Autorzy:
    Aust, S.
    Ahrens, A.
    Benavente-Peces, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/227057.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multiple-input multiple-output system
    orthogonal frequency division multiplexing
    singular value decomposition
    bit allocation
    wireless transmission
    Opis:
    Multicarrier transmission such as OFDM (orthogonal frequency division multiplexing) is an established technique for radio transmission systems and it can be considered as a promising approach for next generation wireless systems. However, in order to comply with the demand on increasing available data rates in particular in wireless technologies, systems with multiple transmit and receive antennas, also called MIMO (multiple-input multiple-output) systems, have become indispensable for future generations of wireless systems. Due to the strongly increasing demand in high-data rate transmission systems, frequency non-selective MIMO links have reached a state of maturity and frequency selective MIMO links are in the focus of interest. In this field, the combination of MIMO transmission and OFDM can be considered as an essential part of fulfilling the requirements of future generations of wireless systems. However, single-user scenarios have reached a state of maturity. By contrast multiple users' scenarios require substantial further research, where in comparison to ZF (zero-forcing) multiuser transmission techniques, the individual user's channel characteristics are taken into consideration in this contribution. The performed joint optimization of the number of activated MIMO layers and the number of transmitted bits per subcarrier shows that not necessarily all user-specific MIMO layers per subcarrier have to be activated in order to minimize the overall BER under the constraint of a given fixed data throughput.
    Źródło:
    International Journal of Electronics and Telecommunications; 2011, 57, 4; 459-464
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of evolutionary algorithm to design minimal phase digital filters with non-standard amplitude characteristics and finite bit word length
    Autorzy:
    Słowik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/202324.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    artificial intelligence
    evolutionary algorithms
    digital filters
    minimal phase
    finite bits word length
    Opis:
    In this paper an application of evolutionary algorithm to design minimal phase digital filters with non-standard amplitude characteristics and with finite bit word length is presented. Four digital filters with infinite impulse response were designed using the proposed method. These digital filters possess: linearly falling characteristics, linearly growing characteristics, nonlinearly falling characteristics, and nonlinearly growing characteristics, and they are designed using bit words with an assumed length. This bit word length is connected with a processing register size. This register size depends on hardware possibilities where digital filter is to be implemented. In this paper, a modification of the mutation operator is introduced too. Due to this modification, better results were obtained in relation to the results obtained using the evolutionary algorithm with other mutation operators. The digital filters designed using the proposed method can be directly implemented in the hardware (DSP system) without any additional modifications.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 2; 125-135
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modulation-Mode Assignment for SVD-assisted Downlink Multiuser MIMO Transmission Schemes with Iterative Detection
    Autorzy:
    Ahrens, A.
    Benavente-Peces, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/226541.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multiple-input multiple-output system
    singular value decomposition
    bit allocation
    power allocation
    wireless transmission
    multiuser transmission
    Opis:
    Since the capacity of multiple-input multiple-output (MIMO) systems increases linearly with the minimum number of antennas at both, the transmitter as well as the receiver side, MIMO systems have attracted a lot of attention for both frequency and non-frequency selective channels and reached a state of maturity. By contrast, MIMO-aided multiple-user systems require substantial further research. In comparison to zero-forcing (ZF) multiuser transmission techniques, where all users are treated jointly, the investigated singular value decomposition (SVD) assisted DL multiuser MIMO solution takes the individual user's channel characteristics into account. In analogy to bit-interleaved coded irregular modulation, we introduce a MIMO-BICM scheme, where different user-specific signal constellations and mapping arrangement were used within a single codeword. Extrinsic information transfer (EXIT) charts are used for analyzing and optimizing the convergence behaviour of the iterative demapping and decoding. Our results show that in order to achieve the best bit-error rate, not necessarily all user-specific MIMO layers have to be activated.
    Źródło:
    International Journal of Electronics and Telecommunications; 2011, 57, 1; 127-134
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dimming control schemes combining IEEE 802.15.7 and SC-LPPM modulation schemes with an adaptive M-QAM OFDM for indoor LOS VLC systems
    Autorzy:
    Mohammed, Nazmi A.
    Badawi, Kareem A.
    Khalaf, Ashraf A. M.
    El-Rabaie, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818236.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    visible light communication
    sub-carrier pulse position modulation
    lightning topologies
    bit error rate
    Opis:
    The presented work proposes a new dimming control schemes for indoor visible light communication which combines variable pulse-position modulation, colour shift keying as key schemes of IEEE 802.15.7 standard, and sub carrier-pulse-position modulation as a pulse-position modulation variant with orthogonal frequency division multiplexing. These schemes are then compared with traditional merging schemes utilizing pulse-width modulation and multiple pulse-position modulation with m-ary quadrature amplitude modulation OFDM. The proposed schemes are investigated in a typical room with a different lighting layout (i.e., distinctive and uniform lighting layout), followed by an illumination investigation to evaluate the performance of the proposed schemes, especially the enhanced achieved data rates, and to determine their limitations as reliable visible light communication systems that can satisfy both communication and illumination requirements.
    Źródło:
    Opto-Electronics Review; 2020, 28, 4; 203--212
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dimming control schemes combining IEEE 802.15.7 and SC-LPPM modulation schemes with an adaptive M-QAM OFDM for indoor LOS VLC systems
    Autorzy:
    Mohammed, Nazmi A.
    Badawi, Kareem A.
    Khalaf, Ashraf A. M.
    El-Rabaie, El-Sayed
    Powiązania:
    https://bibliotekanauki.pl/articles/1818230.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    visible light communication
    sub-carrier pulse position modulation
    lightning topologies
    bit error rate
    Opis:
    The presented work proposes a new dimming control schemes for indoor visible light communication which combines variable pulse-position modulation, colour shift keying as key schemes of IEEE 802.15.7 standard, and sub carrier-pulse-position modulation as a pulse-position modulation variant with orthogonal frequency division multiplexing. These schemes are then compared with traditional merging schemes utilizing pulse-width modulation and multiple pulse-position modulation with m-ary quadrature amplitude modulation OFDM. The proposed schemes are investigated in a typical room with a different lighting layout (i.e., distinctive and uniform lighting layout), followed by an illumination investigation to evaluate the performance of the proposed schemes, especially the enhanced achieved data rates, and to determine their limitations as reliable visible light communication systems that can satisfy both communication and illumination requirements.
    Źródło:
    Opto-Electronics Review; 2020, 28, 4; 203--212
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of GIS systems in the construction of hydraulic model of networks
    Autorzy:
    Wróbel, K.
    Styła, S.
    Sumorek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/410903.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    System Informacji Geograficznej (GIS)
    model hydrauliczny sieci
    mapa bitowa
    mapa wektorowa
    geographic information system (GIS)
    hydraulic model
    bit map
    vector map
    Opis:
    This article presents the use of GIS system for the construction of a hydraulic model in the network enterprise. The model has been built on the basis of data associated with the objects existing in the network and with their spatial relations. The data describing the network objects are usually transferred from existing technical documentation. The local stocktaking of networks is carried out in case of any doubts regarding data update status. The preparation of properly processed data, as well as verification of their correctness while entering them into a database is the most difficult and labour consuming phase of network modelling. A properly configured network model should incorporate at least the following features: the possibility to perform comprehensive analyses of the existing system functioning as well as analyses of the system modernization and extension variants in order to optimize technical solutions.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2012, 1, 2; 63-67
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mikrosystem z układem Zynq do dystrybucji strumienia danychz chaotycznych generatorów PRBG w sieci LAN
    A microsystem with Zynq device for distribution of bit-streams from chaotic PRBG generators in LAN
    Autorzy:
    Dąbal, P.
    Pełka, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/154422.pdf
    Data publikacji:
    2013
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    generatory pseudolosowe
    chaos
    SoC
    FPGA
    pseudorandom generators
    Opis:
    W artykule przedstawiono projekt i wyniki badań eksperymentalnych mikrosystemu w układzie SoC Zynq (Xilinx) przeznaczonego do dystrybucji strumienia danych z chaotycznych generatorów pseudolosowych (PRBG) w sieci LAN. Opisano implementację kilku wariantów architektur chaotycznych generatorów binarnych sekwencji pseudolosowych. Kompletny system zajmuje 2% przerzutników i 7% bloków LUT dostępnych w układzie XC7Z020. Szybkość transmisji danych w sieci LAN, w zależności od konfiguracji systemu, wynosi od 8,8 Mb/s do 53,4 Mb/s. Opracowano aplikację do badań i wspomagania prac projektowych z wykorzystaniem proponowanego mikrosystemu.
    This paper presents a concept, design and experimental results of a SoC-based microsystem with Zynq device from Xilinx, for distribution of chaotic pseudo-random bit-stream from PRBG via LAN. Several variants of PRBGs architectures have been described and tested. The complete system requires about 2% of flip-flops and 7% of LUTs available in the XC7Z020 device. The maximum speed of data transmission on LAN, depends on the system configuration, and varies from 8.8 Mbps to 53.4 Mbps. A dedicated computer application has been developed to support the research and design with use of the proposed microsystem. Pseudo-random bit-stream generators are used e.g. in cryptography and for testing digital systems. Often there is a need for high-speed transmission of data streams to multiple recipients at the same time. The described system supports the distribution of data obtained from embedded PRBGs over the LAN. In order to manage the distribution process, a dedicated client-server has been proposed. The hardware platform and objectives of the system for generation and distribution of pseudo-random sequences are discussed. There are presented the main features of the tools used for development of the project, the software and the library of utility modules that can be used in dedicated user applications.
    Źródło:
    Pomiary Automatyka Kontrola; 2013, R. 59, nr 8, 8; 845-847
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low Complexity Multiplier-less Modified FRM Filter Bank using MPGBP Algorithm
    Autorzy:
    Parvathi, A. K.
    Sakthivel, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2200702.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Frequency response masking (FRM)
    Modified FRM filter bank (ModFRM-FB)
    Multiplier-less filter
    Matching pursuits with generalized bit planes (MPGBP)
    Sum-of-power-of two (SOPOT)
    Common sub-expression elimination (CSE)
    Opis:
    The design of a low complexity multiplier-less narrow transition band filter bank for the channelizer of multistandard software-defined radio (SDR) is investigated in this paper. To accomplish this, the modal filter and complementary filter in the upper and lower branches of the conventional Frequency Response Masking (FRM) architecture are replaced with two power-complementary and linear phase filter banks. Secondly, a new masking strategy is proposed to fully exploit the potential of the numerous spectra replicas produced by the interpolation of the modal filter, which was previously ignored in the existing FRM design. In this scheme, the two masking filters are appropriately modulated and alternately masked over the spectra replicas from 0 to 2π, to generate even and odd channels. This Alternate Masking Scheme (AMS) increases the potency of the Modified FRM (ModFRM) architecture for the design of computationally efficient narrow transition band uniform filter bank (termed as ModFRM-FB). Finally, by combining the adjoining ModFRM-FB channels, Non-Uniform ModFRMFB (NUModFRM-FB) for extracting different communication standards in the SDR channelizer is created. To reduce the total power consumption of the architecture, the coefficients of the proposed system are made multiplier-less using Matching Pursuits Generalized Bit-Planes (MPGBP) algorithm. In this method, filter coefficients are successively approximated using a dictionary of vectors to give a sum-of-power-of-two (SOPOT) representation. In comparison to all other general optimization techniques, such as genetic algorithms, the suggested design method stands out for its ease of implementation, requiring no sophisticated optimization or exhaustive search schemes. Another notable feature of the suggested approach is that, in comparison to existing methods, the design time for approximation has been greatly reduced. To further bring down the complexity, adders are reused in recurrent SOPOT terms using the Common Subexpression Elimination (CSE) technique without compromising the filter performance.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 4; 831--840
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of a high-speed hybrid OAM-OFDM-MDM multiplexed coherent FSO system under desert conditions
    Autorzy:
    Sinha, Shivaji
    Kumar, Chakresh
    Powiązania:
    https://bibliotekanauki.pl/articles/27310107.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    atmospheric attenuation
    bit error rate
    BER
    orbital angular momentum
    OAM
    optical signal-to-noise ratio
    OSNR
    orthogonal frequency division multiplexing
    OFDM
    quadrature amplitude modulation
    QAM
    transmission range
    Opis:
    To meet the needs of future wireless optical networks, this paper introduces a high-speed, hybrid multiplexed, coherent free-space optical (FSO) communication system that integrates an orbital angular momentum (OAM) multiplexed signal with an orthogonal frequency division multiplexing (OFDM) technique. Two independent QAM polarized beams, each carrying in-phase and quadrature (I/Q) phase 16-QAM-OFDM modulated data, are combined using mode division multiplexing (MDM) to increase the capacity of the proposed system. The reason of choosing OFDM is its capability to support higher data rate, and mitigating intersymbol interference (ISI). The signal is detected using a coherent detection-based digital signal processing (DSP) algorithm at the receiver end. The proposed hybrid FSO system is evaluated in low and heavy dust environments using bit error rate (BER), link distance, optical signal-to-noise ratio (OSNR), and received optical power performance matrices. The simulation results demonstrate the successful transmission of a 120 Gb/s single carrier over the longest link ranges of 1.5 and 0.40 km, respectively, under low and heavy dust weather environments below the signal degradation threshold value (forward error correction (FEC) limit) of BER 2.2 × 10–3 in strong turbulent conditions.
    Źródło:
    Optica Applicata; 2023, 53, 3; 431--445
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of a 3rd order 1.5-bit continuous-time (CT) sigma-delta (ΣΔ) modulator optimized for class D audio power amplifier
    Autorzy:
    de Melo, J.
    Paulino, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/398039.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    czas ciągły sigma-delta(ΣΔ)
    wzmacniacz klasy D
    audio
    Continuous-Time(CT) Sigma-Delta(ΣΔ)
    class D amplifier
    Opis:
    This paper presents a 3rd order 1.5-bit ΣΔ modulator with distributed feedback and local resonator feedback for a Class D audio amplifier. In order to improve the signal-to-noise-and-distortion ratio (SNDR), without increasing the oversampling ratio (OSR) or the order of the modulator, the modulator uses transmission zeros and 1.5-bit quantization. High level simulations of the modulator architecture show that it has a maximum SNDR value of 81 dB, for a signal bandwidth of 18 kHz and a sampling frequency of 1.2 MHz. An electrical circuit is designed to implement the proposed architecture and the electrical simulations show that it has a maximum SNDR value of 76.1 dB. The influence of the constituting blocks of the circuit in the performance of the modulator is investigated using electrical simulations.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2010, 1, 2; 156-164
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance analysis of optimized non-zero dispersion shifted fiber without amplification and without dispersion compensation for wavelength division multiplexing optical networks
    Autorzy:
    Priya, R.
    Sivanantharaja, A.
    Selvendran, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/174883.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    non-zero dispersion shifted fiber (NZDSF)
    repeaterless wavelength division multiplexing (WDM) links
    dispersion
    nonlinear effects
    four wave mixing (FWM)
    refractive index profile
    bit error rate (BER)
    Opis:
    In this paper, we have analyzed the performance of our optimized non-zero dispersion shifted fiber with three different test fibers, namely, single mode fiber, conventional non-zero dispersion shifted fiber and dispersion shifted fiber. While comparing the performances of those fibers, our optimized non-zero dispersion shifted fiber has yielded a better quality factor of 5.24 at 2.5 Gbit/s for long haul fiber length of 120 km in the absence of amplification and dispersion compensation. In order to measure the nonlinear impairments of wavelength division multiplexing channel, the quality factor values are measured at the sample channel 193.1 THz for 150 km lengthed fiber with peak input power of 6 dBm. Due to a very large effective area of optimized non-zero dispersion shifted fiber, it delivers a better quality factor of 6.12 compared to the other test fibers. We have also carried out the analysis for higher bitrates and different modulation formats at the transmission end. More phase encoded modulations of carrier-suppressed return-to-zero–differentiated phase shift keying and carrier-suppressed return-to-zero–differential quadrature phase shift keying offered optimum performances for a distance of 120 km at 10 Gbit/s bitrate. By including optical amplifiers, we could achieve a record fiber transmission length of 4000 km at the bitrate of 2.5 Gbit/s which can help the future wavelength division multiplexing optical networks to a great extent.
    Źródło:
    Optica Applicata; 2015, 45, 4; 473-490
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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