Andrea Ballo  Alfio Dario Grasso  Gaetano Palumbo  Toru Tanzawa 《International Journal of Circuit Theory and Applications》2020,48(4):555-566

This paper introduces a design strategy to reduce rise time of charge pumps maintaining equal the silicon area, which is effective when the load capacitance is lower than the total charge pump capacitance. The strategy relies on an unconventional pumping capacitors sizing, which set them not equal and follows a linear distribution. The approach is based on a theoretical analysis and is validated through post-layout simulations using a 130-nm complementary metal-oxide semiconductor (CMOS) standard technology. The simulations demonstrate the advantages of the proposed design strategy and the accuracy of the theory.  相似文献   

    

Andrea Ballo  Alfio Dario Grasso  Gaetano Palumbo 《International Journal of Circuit Theory and Applications》2020,48(11):1864-1872

This letter introduces a novel scheme to improve charge transfer switches in linear charge pumps. The proposed approach relies on the reduction of the threshold voltage of the transistor implementing each charge transfer switch by forcing a current into its bulk junction. Simulation results using a 130-nm standard complementary metal-oxide semiconductor (CMOS) technology confirm the effectiveness of the proposed method.  相似文献   

    

Jonna E. B. Koper  Linda M. P. Loonen  Jerry M. Wells  Antonio Dario Troise  Edoardo Capuano  Vincenzo Fogliano 《Molecular nutrition & food research》2019,63(3)

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Lorenzo Bigiani  Dario Zappa  Chiara Maccato  Alberto Gasparotto  Cinzia Sada  Elisabetta Comini  Davide Barreca 《Advanced Materials Interfaces》2019,6(24)

The fabrication of metal oxide‐based gas sensors with tailored structural design is of particular importance for the early recognition of poisonous/explosive analytes like ammonia, an irritating chemical occurring in a plethora of practical contexts. In this regard, the present work reports on the fabrication and gas sensing application of p‐Mn₃O₄/n‐M_xO_y nanocomposites with M_xO_y = Fe₂O₃ or ZnO. The target systems are developed by chemical vapor deposition of Mn₃O₄ nanosystems on alumina substrates and subsequent functionalization with iron or zinc oxides by sputtering under mild conditions. Material characterization reveals the formation of high purity composites with a controllable dispersion of Fe₂O₃ or ZnO into Mn₃O₄, and a close contact between the single constituents. The latter feature, resulting in the formation of p‐n junctions and in a tailored modulation of Mn₃O₄ hole accumulation layer, is of strategic importance in obtaining promising responses to ammonia already at moderate temperatures. Furthermore, Fe₂O₃ or ZnO functionalization empowers the pristine Mn₃O₄ with good selectivity toward NH₃ against other potential interferents. These results, along with the very favorable detection limits, provide new physical insights for the implementation of gas‐sensitive devices with p‐n junctions aimed at practical end uses.  相似文献   

    

Dario Bruzzese  Cristina Davino   《Journal of Visual Languages and Computing》2003,14(6):621-635

Association rules (AR) represent a consolidated tool in data mining applications as they are able to discover regularities in large data sets. The information mined by the rules is very often difficult to exploit because of the presence of too many associations where to detect the really relevant logical implications. In this framework, by combining methodological and graphical pruning techniques, AR post-analysis tools are proposed. The methodological techniques will ensure the statistical significance of the AR which were not pruned, while the graphical ones will provide interactive and powerful visualization tools.  相似文献   

    

Mario Alessandro Imperato  Giovanni Jacovitti  Alessandro Neri 《Transactions on Emerging Telecommunications Technologies》1991,2(3):299-304

Starting from the principle that the distorsion measure, representing the cost payed by the users for lossy reproducing an image, takes its maxima in correspondence of local minima of Shannon's Entropy, a space variant resolution coding method matched to the local content of the image is presented. A fidelity criterion based on the estimated kurtosis function of the image is then applied to drive the quantization phase of an ADCT coder. Finally, an enhanced version of the ISO/CCITT hierarchical progressive transmission mode is proposed and its perfomance evaluated on the basis of reference images.  相似文献   

    

Michael Basin  Peng Shi  Dario Calderon-Alvarez 《International journal of control》2013,86(4):724-730

In this article, the mean-square filtering problem for polynomial system states over polynomial observations is studied proceeding from the general expression for the stochastic Ito differentials of the mean-square estimate and the error variance. In contrast to the previously obtained results, this article deals with the general case of nonlinear polynomial states and observations. As a result, the Ito differentials for the mean-square estimate and error variance corresponding to the stated filtering problem are first derived. The procedure for obtaining an approximate closed-form finite-dimensional system of the filtering equations for any polynomial state over observations with any polynomial drift is then established. In the example, the obtained closed-form filter is applied to solve the third-order sensor filtering problem for a quadratic state, assuming a conditionally Gaussian initial condition for the extended third-order state vector. The simulation results show that the designed filter yields a reliable and rapidly converging estimate.  相似文献   

    

Michel Abdalla  Dario Catalano  Dario Fiore 《Journal of Cryptology》2014,27(3):544-593

In this paper we show a relation between the notions of verifiable random functions (VRFs) and identity-based key encapsulation mechanisms (IB-KEMs). In particular, we propose a class of IB-KEMs that we call VRF-suitable, and we propose a direct construction of VRFs from VRF-suitable IB-KEMs. Informally, an IB-KEM is VRF-suitable if it provides what we call unique decapsulation (i.e., given a ciphertext C produced with respect to an identity ID, all the secret keys corresponding to identity ID′, decapsulate to the same value, even if ID≠ID′), and it satisfies an additional property that we call pseudo-random decapsulation. In a nutshell, pseudo-random decapsulation means that if one decapsulates a ciphertext C, produced with respect to an identity ID, using the decryption key corresponding to any other identity ID′, the resulting value looks random to a polynomially bounded observer. Our construction is of interest both from a theoretical and a practical perspective. Indeed, apart from establishing a connection between two seemingly unrelated primitives, our methodology is direct in the sense that, in contrast to most previous constructions, it avoids the inefficient Goldreich–Levin hardcore bit transformation. As an additional contribution, we propose a new VRF-suitable IB-KEM based on the decisional ?-weak Bilinear Diffie–Hellman Inversion assumption. Interestingly, when applying our transformation to this scheme, we obtain a new VRF construction that is secure under the same assumption, and it efficiently supports a large input space.  相似文献   

    

Despina Fragouli  Luana Persano  Giovanni Paladini  Dario Pisignano  Riccardo Carzino  Francesca Pignatelli  Roberto Cingolani  Athanassia Athanassiou 《Advanced functional materials》2008,18(11):1617-1623

In this Full Paper, the possibility of reversibly changing the diffraction efficiency of gratings, fabricated by soft molding lithography on polymer films, containing photochromic molecules, is demonstrated. In particular, alternating UV and visible laser irradiation of the gratings causes the doped photochromic molecules to undergo transformations, which induce reversible dimensional changes to the samples. As a result, reversible changes are monitored in the intensity of the beams of a diode laser, transmitted and diffracted from the gratings. These changes affect the diffraction efficiency, which is increased upon irradiation with UV and decreased after irradiation with visible laser light. Such gratings are promising candidates for the fabrication of modern optical components such as optical switching devices.  相似文献   

    

Lorenzo Fagiano  Mario Milanese  Dario Piga 《国际强度与非线性控制杂志
》2012,22(18):2055-2083

This paper presents novel results related to an innovative airborne wind energy technology, named Kitenergy, for the conversion of high‐altitude wind energy into electricity. The research activities carried out in the last five years, including theoretical analyses, numerical simulations, and experimental tests, indicate that Kitenergy could bring forth a revolution in wind energy generation, providing renewable energy in large quantities at a lower cost than fossil energy. This work investigates three important theoretical aspects: the evaluation of the performance achieved by the employed control law, the optimization of the generator operating cycle, and the possibility to generate continuously a constant and maximal power output. These issues are tackled through the combined use of modeling, control, and optimization methods that result to be key technologies for a significant breakthrough in renewable energy generation. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献