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    Wyświetlanie 1-10 z 10
    Tytuł:
    Comparison of traffic performance of QPSK and 16-QAM modulation techniques for OFDM system
    Autorzy:
    Islam, I.
    Hossain, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/308854.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    OFDM
    QPSK
    16-QAM
    IFFT
    frequency spectrum
    PAPR
    BER
    Opis:
    Orthogonal frequency division multiplexing (OFDM) provides better spectral efficiency than frequency division multiplexing (FDM), while maintaining orthogonal relation between carriers; hence traffic is better carried by OFDM than FDM within the same spectrum. This paper reveals a comparison of spectral efficiency, performance of communication system in context of bit error rate (BER) for the same information rate and peak to average power ratio (PAPR) of quadrature amplitude shift keying (QPSK) and 16-quadrature amplitude modulation (16-QAM) technique.
    Źródło:
    Journal of Telecommunications and Information Technology; 2005, 1; 147-152
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oxidative damage to DNA and antioxidant status in aging and age-related diseases
    Autorzy:
    Olinski, Ryszard
    Siomek, Agnieszka
    Rozalski, Rafal
    Gackowski, Daniel
    Foksinski, Marek
    Guz, Jolanta
    Dziaman, Tomasz
    Szpila, Anna
    Tudek, Barbara
    Powiązania:
    https://bibliotekanauki.pl/articles/1041102.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    ROS
    aging
    oxidative DNA damage
    age-related diseases
    BER
    GO system
    Opis:
    Aging is a complex process involving morphologic and biochemical changes in single cells and in the whole organism. One of the most popular explanations of how aging occurs at the molecular level is the oxidative stress hypothesis. Oxidative stress leads in many cases to an age-dependent increase in the cellular level of oxidatively modified macromolecules including DNA, and it is this increase which has been linked to various pathological conditions, such as aging, carcinogenesis, neurodegenerative and cardiovascular diseases. It is, however, possible that a number of short-comings associated with gaps in our knowledge may be responsible for the failure to produce definite results when applied to understanding the role of DNA damage in aging and age-related diseases.
    Źródło:
    Acta Biochimica Polonica; 2007, 54, 1; 11-26
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of APEX Ile64val Gene Polymorphisms of DNA Repair Ber System on Modulation of the Risk of Colorectal Cancer in the Polish Population
    Autorzy:
    Kabziński, Jacek
    Majsterek, Ireneusz
    Mik, Michał
    Dziki, Adam
    Dziki, Łukasz
    Maciejczak, Lucjan
    Powiązania:
    https://bibliotekanauki.pl/articles/1395566.pdf
    Data publikacji:
    2015-03-01
    Wydawca:
    Index Copernicus International
    Tematy:
    colorectal cancer
    polymorphisms
    APEX
    DNA repair
    Opis:
    Colorectal cancer (CRC) is one of the deadliest cancers which lie in the incidence of morbidity in second place. Intensive research is to determine and confirm the genetic basis of this disease, which is believed may have a direct relationship with the reduced efficiency of DNA repair systems. The aim of this study was to determine the effect of APEX gene polymorphism Ile64Val on increasing the risk of colorectal cancer in the Polish population. Material and methods. The blood samples collected from 150 patients diagnosed with colon cancer was used. The control group consisted of 150 healthy subjects. Genotyping was performed by TaqMan method. Results. The results indicate that genotype Ile Val is associated with an increased risk of colorectal cancer (OR 2.069; 95% CI 1,205-3,552; p = 0.008). Conclusions. Based on these results, we conclude that the APEX gene polymorphism Ile64Val may be associated with an increased risk of colorectal cancer.
    Źródło:
    Polish Journal of Surgery; 2015, 87, 3; 121-123
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The develоpment оf a sensоr system fоr mоnіtоrіng the dіsplacement оf hоrіzоntal laterals іn Radіal Drіllіng Technоlоgy
    Autorzy:
    Zіаjа, J.
    Mоwczаn, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/299195.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    hydraulіc system
    deflectоr shоe
    sensоr develоpment
    оptіcal fіber sensоr
    Opis:
    Radіal drіllіng technоlоgy was develоped by Rad Tech Іnternatіоnal Іnc., an Amerіcan cоmpany set up by Henk Jelsma, іts permanent head and the technоlоgy patent hоlder. Fіrst іntrоduced іn the Americas, radіal drіllіng technоlоgy acquіred wіde recоgnіtіоn іn the USA and Cоlоmbіa and later fоund applіcatіоns іn Canada, Bоlіvіa, Argentіna, Chіle and the Mіddle East. Іn general, thіs technоlоgy іs aіmed at extendіng and іmprоvіng draіnage areas іn prоductіve fоrmatіоns. Оther applіcatіоns оf radіal drіllіng іnclude the creatіоn оf specіfіcally dіrected іnjectіоn channels and explоratіоn actіvіtіes. Perfоrmance testіng оf these shоrt radіus laterals has nоt been adequately studіed and sіgnіfіcant questіоns remaіn abоut hоw well these technоlоgіes can delіver оn their prоmіses. The maіn оbjectіve оf the paper іs tо sum up prevіоus experіence іn develоpіng a system fоr mоnіtоrіng the dіsplacement оf hоrіzоntal laterals and wells, and examining a prospective new technоlоgy whіch can іncrease the effіcіency оf radіal drіllіng
    Źródło:
    AGH Drilling, Oil, Gas; 2017, 34, 4; 875-881
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A model of OFDM based maritime VHF communication system for data exchange
    Autorzy:
    Valčić, S.
    Pogány, T.
    Mrak, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/260386.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    maritime VHF communications
    OFDM modulation
    AWGN
    SNR
    BER
    Opis:
    In the maritime Very High Frequency (VHF) band, there are no systems for transmitting large amounts of data. Therefore, it is necessary to develop new systems that would modernize the Global Maritime Distress and Safety System (GMDSS), significantly relieve the Automatic Identification System’s (AIS) communication channels, and set guidelines for the development of communication infrastructure of the e-Navigation. In line with this, analytical and simulation models of the maritime VHF data transmission communication system using Orthogonal Frequency Division Multiplexing (OFDM) modulation are worked out in this paper. The achieved data rate, the spectral efficiency and the bit error rate (BER) represent validation parameters on which the results of the analytical and simulation models are evaluated. It is concluded that the application of the digital OFDM modulation in the maritime VHF band may improve the GMDSS system by achieving higher data rates compared to the current terrestrial mandatory systems for data exchange, i.e. Digital Selective Calling (DSC) and AIS.
    Źródło:
    Polish Maritime Research; 2018, 2; 27-36
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using Least Mean p-Power Algorithm to Correct Channel Distortion in MC-CDMA Systems
    Autorzy:
    Zidane, M.
    Safi, S.
    Sabri, M.
    Frikel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/308275.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    adaptive equalization
    adaptive identification
    BER
    BRAN C
    LMP
    MC-CDMA system
    ZF
    Opis:
    This work focuses on adaptive Broadband Radio Access Network (BRAN) channel identification and on downlink Multi-Carrier Code Division Multiple Access (MCCDMA) equalization. We use the normalized BRAN C channel model for 4G mobile communications, distinguishing between indoor and outdoor scenarios. On the one hand, BRAN C channel parameters are identified using the Least Mean p-Power (LMP) algorithm. On the other, we consider these coefficients in the context of adaptive equalization. We provide an overview and a mathematic formulation of MC-CDMA systems. According to these fundamental concepts, the equalizer technique is investigated analytically to compensate for channel distortion in terms of the bit error rate (BER). The numerical simulation results, for various signal-to-noise ratios and different p threshold, show that the presented algorithm is able to simulate the BRAN C channel measured with different accuracy levels. Furthermore, as far as the adaptive equalization problem is concerned, the results obtained using the zero-forcing equalizer demonstrate that the algorithm is adequate for some particular cases of threshold p.
    Źródło:
    Journal of Telecommunications and Information Technology; 2018, 3; 23-30
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    System BER w naprawie uszkodzeń oksydacyjnych u roślin
    System BER in the repair of oxidative damage in plants
    Autorzy:
    Włodarczyk, Sylwia
    Powiązania:
    https://bibliotekanauki.pl/articles/2199375.pdf
    Data publikacji:
    2020-10-22
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    system BER
    starzenie nasion
    ROS
    uszkodzenia oksydacyjne
    FPG
    OGG1
    BER system
    seed aging
    oxidative damage
    Opis:
    Rośliny wytworzyły szereg mechanizmów odpowiadających za naprawę uszkodzeń oksydacyjnych wywołanych reaktywnymi formami tlenu. System naprawy poprzez wycinanie zasad wydaje się głównym system naprawczym prowadzącym do zniwelowania zmian wytworzonych przez reaktywne formy tlenu. UUważa się, że dwoma ważnymi enzymami odpowiadającymi za usuwanie 8-oksoguaniny są glikozylaza 8-oksoguaniny DNA i glikozylaza DNA formamidopirimidyny. Wielu badaczy zauważa zależność pomiędzy nagromadzeniem zmian oksydacyjnych w komórce, a aktywnością glikozylazy 8-oksoguaniny DNA i glikozylazy DNA formamidopirimidyny, oraz starzeniem się nasion. Potwierdzono, że poziom FPG oraz OGG1 wzrasta podczas imbibicji nasion. Niniejsza praca ma na celu przybliżenie działania systemu naprawczego BER w procesie napraw uszkodzeń oksydacyjnych oddziaływujących na starzenie się nasion. Celem pracy jest przedstawienie obecnego stanu na temat działania systemu BER (ang Base Excision Repair) w naprawie uszkodzeń oksydacyjnych wpływających na starzenie się nasion.
    Plants have developed a number of mechanisms that are responsible for repairing the oxidative damage caused by reactive oxygen species. The base excision repair system is the main repair system for removing such changes. Herein, 8-oxoguanine DNA glycosylase and formamidopyrimidine DNA glycosylase are the two enzymes of importance for removing 8-oxoG. Researchers have confirmed that FPG and OGG1 levels increase during seed imbibition. Indeed, many researchers note the relationship between the accumulation of oxidative changes in the cell and the activity of OGG1 and FPG and the aging of seeds. This short review aims at presenting the published data on the operation of the base excision repair system in the process of repairing oxidative damage affecting seed aging.
    Źródło:
    Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin; 2020, 290; 15-19
    0373-7837
    2657-8913
    Pojawia się w:
    Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative BER Analysis of Free Space Optical System Using Wavelength Diversity over Exponentiated Weibull Channel
    Autorzy:
    Shah, Dhaval
    Joshi, Hardik
    Kothari, Dilipkumar
    Powiązania:
    https://bibliotekanauki.pl/articles/2055211.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bit error rate
    exponentiated weibull distribution
    free space optics
    FSO
    wavelingth diversity
    optimal combining
    Opis:
    Atmospheric turbulence is considered as major threat to Free Space Optical (FSO) communication as it causes irradiance and phase fluctuations of the transmitted signal which degrade the performance of FSO system. Wavelength diversity is one of the techniques to mitigate these effects. In this paper, the wavelength diversity technique is applied to FSO system to improve the performance under different turbulence conditions which are modeled using Exponentiated Weibull (EW) channel. In this technique, the data was communicated through 1.55 µm, 1.31 µm, and 0.85 µm carrier wavelengths. Optimal Combining (OC) scheme has been considered to receive the signals at receiver. Mathematical equation for average BER is derived for wavelength diversity based FSO system. Results are obtained for the different link length under different turbulence conditions. The obtained average BER results for different turbulence conditions characterized by EW channel is compared with the published result of average BER for different turbulence which is presented by classical channel model. A comparative BER analysis shows that maximum advantage of wavelength diversity technique is obtained when different turbulence conditions are modeled by EW channel.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 4; 665--672
    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
      Wyświetlanie 1-10 z 10

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