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    Wyświetlanie 1-7 z 7
    Tytuł:
    Persistent Sequences with Effective Random Access and Support for Infinity
    Autorzy:
    Grzanek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/972898.pdf
    Data publikacji:
    2014
    Wydawca:
    Społeczna Akademia Nauk w Łodzi
    Tematy:
    functional programming
    Clojure
    persistent collections
    infinity
    random access
    Opis:
    Persistent sequences are the core data structure in functional programming style. Their typical implementations usually allow creating infinite streams of objects. Unfortunately, asking for length of an infinite data structure never ends or ends with a run-time error. Similarly, there is no default way to make an effective, O[1] or logarithmic access to an arbitrarily chosen sequence element, even when the nature of the correlation between index value and the sequence element is known. This paper presents a Clojure library that meets these limitations and offers an enhanced version of sequences with a support for effective random access and the ability to ask for an infinite length.
    Źródło:
    Journal of Applied Computer Science Methods; 2014, 6 No. 1; 67-80
    1689-9636
    Pojawia się w:
    Journal of Applied Computer Science Methods
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Address sequences and backgrounds with different Hamming distances for multiple run March tests
    Autorzy:
    Yarmolik, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/907905.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    pamięć o dostępie swobodnym
    testowanie pamięci
    adres pamięci
    kod Graya
    odległość Hamminga
    random-access memory (RAM)
    memory testing
    March memory test
    neighbourhood pattern sensitive faults
    memory address
    memory background
    Gray code
    hamming distance
    Opis:
    It is widely known that pattern sensitive faults are the most difficult faults to detect during the RAM testing process. One of the techniques which can be used for effective detection of this kind of faults is the multi-background test technique. According to this technique, multiple-run memory test execution is done. In this case, to achieve a high fault coverage, the structure of the consecutive memory backgrounds and the address sequence are very important. This paper defines requirements which have to be taken into account in the background and address sequence selection process. A set of backgrounds which satisfied those requirements guarantee us to achieve a very high fault coverage for multi-background memory testing.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2008, 18, 3; 329-339
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mikrosystemy i Sensory
    Microsystems and Sensors
    Autorzy:
    Maksymowicz, L.
    Nowak, S.
    Leja, E.
    Pisarkiewicz, T.
    Stapiński, T.
    Zakrzewska, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/154228.pdf
    Data publikacji:
    2007
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    optoelectronics
    semiconducting gas sensors
    modified multicrystalline silicon structures as a light detector thin film technology
    vacuum equipment
    magnetic tunnel junctions
    magnetic random access memory MRAM
    radio frequency identification (RFID)
    mine underground environment
    ceramic microsystem
    microfluidics
    LTCC
    photoimageable thick-films
    Opis:
    Prezentowana praca zawiera wybrane zagadnienia naukowe związane z rozwijaną od lat tematyką w Katedrze Elektroniki dotyczącą mikrosystemów i sensorów. Autorzy odnieśli się do szczegółowych zagadnień takich jak: półprzewodnikowe sensory gazu, zmodyfikowane struktury multikrystalicznego krzemu jako detektor światła, cienkowarstwowe magnetyczne złącza tunelowe i ich zastosowania. Opisano również opracowywane technologie i konstrukcje urządzeń próżniowych do wytwarzania cienkich warstw i układów wielowarstwowych. Zaprezentowano przykładowe zastosowania techniki sensorowej i radiowej identyfikacji obiektów RFID w sektorze energetycznym. Przedstawiono zastosowanie dwóch zaawansowanych technologii ceramicznych - współwypalanych folii ceramicznych LTCC oraz warstw grubych fotoformowalnych do wytworzenia elementów składowych mikrosystemu ceramicznego dla chromatografii - mikrokanału oraz płomieniowego detektora jonizacyjnego.
    The work deals with scientific problems connected with microsystems and sensor technology developed in Department of Electronics. The authors present their achievements such as semiconductor gas sensors, microcrystalline silicon light detectors, thin film magnetic tunnel junctions and their applications. Some vacuum systems for films and multilayers depositions were also designed and constructed by our scientific staff. The sensor and radio frequency identification (RFID) applications were also described. Two advanced ceramic technologies (photoimageable thick films and LTCC) has been successfully combined to obtain microfluidic structures - the microchannel and the flame ionisation detector which are intended to use in a simple, portable ceramic microsystem for chromatography.
    Źródło:
    Pomiary Automatyka Kontrola; 2007, R. 53, nr 3, 3; 63-69
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal assisted switching magnetic tunnel junctions as FPGA memory elements
    Autorzy:
    Silva, V.
    Fernandes, J. R.
    Oliveira, L. B.
    Neto, H. C.
    Ferreira, R.
    Freitas, S.
    Freitas, P. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/397855.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    MRAM (oporność magnetyczna pamięci o dostępie swobodnym)
    MTJ (magnetyczny tunel połączeń)
    pisanie projektów (programów)
    FIMS (pole indukowane magnetycznym przełącznikiem)
    MRAM (magnetoresistive random access memory)
    MTJ (magnetic tunnel junction)
    writing schemes
    FIMS (field induced magnetic switching)
    TAS (thermal assisted switching)
    STT
    Opis:
    This paper presents our research and development work on new circuits and topologies based on Magnetic RAM for use as configuration memory elements of reconfigurable arrays. MRAM provides non volatility with cell areas and with access speeds comparable to those of SRAM and with lower process complexity than FLASH memories. The new memory cells take advantage of the Thermal Assisted Switching (TAS) writing technique to solve the drawbacks of the more common Field Induced Magnetic Switching writing technique. The CMOS circuit structures to implement the main components for reading and writing the MTJ cells have been developed, characterized and evaluated. A scaled down prototype of a coarse grain reconfigurable array that employs the TAS-MRAM elements as configuration memory has been designed and electrically simulated pre- and post- layout. The results obtained for all the circuit elements, namely the storage cells and the current generators, indicate that the new configuration memory cells can provide a very promising technological solution for run-time reconfigurable hardware devices. The prototype has been manufactured using a standard process 0.35μm 4-Metal CMOS process technology and should be under test in the foreseeable future.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2010, 1, 1; 31-36
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implementation of Multiple Access Techniques Applicable for Maritime Satellite Communications
    Autorzy:
    Ilcev, S. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/116635.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Global Maritime Distress and Safety System (GMDSS)
    Maritime Mobile Satellite Communications (MMSC)
    Multiple Access (MA)
    Multiple Access Techniques
    Code Division Multiple Access (CDMA)
    Time Division Multiple Access (TDMA)
    Frequency Division Multiple Access (FDMA)
    Random (Packet) Division Multiple Access (RDMA)
    Opis:
    In this paper are introduced fundamentals, characteristics, advantages and disadvantages of Multiple Access (MA) employed as transmission techniques in the Maritime Mobile Satellite Communications (MMSC) between ships and Coast Earth Station (CES) via Geostationary Earth Orbit (GEO) or Not-GEO satellite constellations. In fixed satellite communication, as a rule, especially in MMSC many users are active at the same time. The problem of simultaneous communications between many single or multipoint mobile satellite users can be solved by using MA technique, such as Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Code Division Multiple Access (CDMA), Space Division Multiple Access (SDMA) and Random (Packet) Division Multiple Access (RDMA). Since the resources of the systems such as the transmitting power and the bandwidth are limited, it is advisable to use the channels with complete charge and to create a different MA to the channel. This generates a problem of summation and separation of signals in the transmission and reception parts, respectively. Deciding this problem consists in the development of orthogonal channels of transmission in order to divide signals from various users unambiguously on the reception part.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 4; 529-540
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modulo N Backoff Scheme for Effective QoS Differentiation and Increased Bandwidth Utilization in IEEE 802.11 Networks
    Autorzy:
    Janczar, T.
    Konorski, J.
    Wodniak, J.
    Pawlikowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/308888.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    channel access
    MAC
    performance analysis
    random backoff
    WLAN
    Opis:
    The paper presents a new modulo N channel access scheme for wireless local area networks (WLANs). The novel solution derives from the distributed coordination function (DCF) of the IEEE 802.11 standard, further elaborated as enhanced distribution channel access (EDCA) by the 802.11e draft specification. The main innovation concerns improvement of the binary exponential backoff scheme used for collision avoidance in 802.11 networks. The most appealing feature of the new modulo N backoff scheme is that it outperforms the original 802.11 solution in terms of channel utilization ratio under any traffic conditions. Furthermore, the modulo N proposal can be naturally augmented with QoS differentiation mechanisms like 802.11e extensions. The prioritized modulo N scheme achieves better throughput-delay characteristics for multimedia traffic when compared with the original 802.11e proposal. At the same time, the new solution retains backward compatibility and includes all features which have made IEEE 802.11 networks extremely popular nowadays.
    Źródło:
    Journal of Telecommunications and Information Technology; 2009, 2; 41-47
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reduction of BER using RSC code for Optical Code Division Multiple Access Networks
    Autorzy:
    Panda, Satyasen
    Powiązania:
    https://bibliotekanauki.pl/articles/1178316.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Cross Correlation (CC)
    Multiple Access Interface (MAI)
    Optical Code Division Multiple Access (OCDMA)
    Random Sparse Code (RSC)
    Wavelength hopping time spreading (WHTS)
    Opis:
    In this study, a two dimensional (2-D) wavelength hopping and time spreading (WHTS) optical code division multiple access (OCDMA) code is designed using Sparse ruler technique. The proposed 64 bit 2-D code is constructed by an algorithm based on random spacing of sparse codes referred in this work as Random Sparse Code (RSC). The performance of the proposed 2-D RSC is evaluated in terms of bit error rate (BER), received signal power and time domain analysis of received signals. The system performance of the OCDMA system utilizing 2-D RSC code improved significantly due to less BER, low cross correlation property and simple encoder/decoder design. The output BER is much lower at a data rate of 1.25 gbps and 2.5 gbps for a distance of 100 km with ITU-T standard single mode fiber with attenuation level of 0.2dB/km.
    Źródło:
    World Scientific News; 2017, 81, 2; 106-120
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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