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Now showing 1 - 5 of 16
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    Design of Multi-bit Pulsed Latches with Scan Input in CMOS ONK65 Technology
    (Společnost pro radioelektronické inženýrství, 2023-12) Kral, V.
    This paper presents a new multi-bit pulse latch design that places innovative emphasis on the integration of scan input for automatic test pattern generation (ATPG). Two different designs have been developed in ONK65 technology (65 nm process): the first with standard threshold voltage (SVT) tailored for consumer products and the second with high threshold voltage (HVT) for automotive, each addressing specific aspects of process, voltage, and temperature (PVT). Multi-bit pulse latches offer a more efficient alternative to multi-bit flip-flop circuits and promise significant power and area savings. However, the efficiency of these latches depends on the technology, library type and customer requirements. A multi-bit pulse latch consists of a pulse generator and a pulsed latch. Each component is carefully designed for its specific purpose and the most appropriate topology is selected. Furthermore, the paper serves as a comprehensive guide to the design of low-power digital cells. It rethinks the topology design approach by emphasizing the scan input and presents simulation results for both components of the multi-bit pulse latch, highlighting their advantages. The results show that a less strict PVT offers greater benefits than a strict PVT.
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    SPICE Modeling of Memcomputing Logic Gates
    (Společnost pro radioelektronické inženýrství, 2023-12) Pershin, Y. V.
    Memcomputing logic gates generalize the traditional Boolean logic gates for operation in the reverse direction. According to the literature, this functionality enables efficient solution of computationally intensive problems, including factorization and NP-complete problems. To approach the deployment of memcomputing gates in hardware, this paper introduces SPICE models of memcomputing logic gates following their original definition. Using these models, we demonstrate the behavior of single gates as well as small self-organizing circuits. We have also corrected some inconsistencies in the prior literature. Notably, the correct schematics of the dynamic correction module is reported here for the first time. Our work makes memcomputing more accessible to those interested in this emerging computing technology.
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    Synchronization of Dissipative Nose–Hoover Systems: Circuit Implementation
    (Společnost pro radioelektronické inženýrství, 2023-12) Lu, R.; Natiq, H.; Ali, A. M. A.; Abdolmohammadi, H. R.; Jafari, S.
    The synchronization of dynamical systems has been extensively studied across various scientific disciplines, including secure communication, providing insights into the collective behavior of complex systems. This paper investigated the synchronization of diffusively coupled dissipative Nose-Hoover (DNH) systems analytically and experimentally. This system exhibits a variety of fascinating dynamical phenomena, including multistable or monostable chaotic solutions and attractive torus. The DNH circuit is implemented in OrCAD-PSpice, focusing on chaotic dynamics. The DNH system is thus said to be diffusively coupled by considering a passive resistor to link the corresponding states of two DNH circuits. The coupling scheme and strength (resistor value) under which two circuits can be synchronized are attained using the master stability function method and are then confirmed by computing the synchronization error. The correlation of coupled circuits' outputs (time evolutions) demonstrates complete synchronization, which is consistent with the analytical and experimental results
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    Energy-Efficient Path Construction for Data Gathering Using Mobile Data Collectors in Wireless Sensor Networks
    (Společnost pro radioelektronické inženýrství, 2023-12) Jlassi, W.; Haddad, R.; Bouallegue, R.
    Energy is seen as a significant factor in wireless sensor networks (WSNs). It is a challenge to balance between battery lifetime of the different sensors and network lifetime. The main contribution of the proposed approach is to decrease the energy consumption of each sensor node, overcome unbalanced energy usage among sensor nodes, reduce the data gathering time and enhance the network lifetime. To achieve these goals, we combine the Hierarchical Agglomerative algorithm and an optimal path selection method. First, the suitable cluster heads (CHs) are elected based on the Euclidean distance and the residual energy of each sensor node. Then, the base station is situated at the center of the field, which will be partitioned into equal subareas, one for every mobile data collector (MDC). Second, the Kruskal algorithm is used to create an optimal data gathering path from each subset of elected cluster heads. Finally, each mobile data collector travels the optimal path to collect the data from the set of cluster heads of each subarea and returns periodically to the base station to upload gathered data. Computer simulation proves that the proposed approach outperforms existing ones in terms of data gathering time, residual energy and network lifetime
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    Depersonalization of Speech Using Speaker-Specific Transform Based on Long-Term Spectrum
    (Společnost pro radioelektronické inženýrství, 2023-12) Rujzl, M.; Sigmund, M.
    This paper introduces a novel approach for hiding personal information in speech signals. The proposed approach applied a transform warping function, which is obtained from a long-term linear prediction spectrum individually for each speaker. The depersonalized speech was compared with the often used technique based on vocal tract length normalization. The proposed approach performs wider manipulation of fundamental frequency and provides higher intelligibility by 5% in clean speech and by 8% for signal-to-noise ratio 5 dB. It also significantly alters the derived glottal pulses, making them difficult to use for personality analysis. Speech intelligibility index and glottal pulse distortion are new aspects in the field of voice depersonalization.