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排序方式: 共有110条查询结果,搜索用时 15 毫秒
1.
Marco Mandolini Federico Campi Claudio Favi Michele Germani Roberto Raffaeli 《The International Journal of Advanced Manufacturing Technology》2020,107(3):1131-1151
This paper presents a novel framework for manufacturing and cost-related knowledge formalization. This artefact allows industries to capitalize the knowled 相似文献
2.
Lodi A. Toma M. Campi F. Cappelli A. Canegallo R. Guerrieri R. 《Solid-State Circuits, IEEE Journal of》2003,38(11):1876-1886
This paper describes a new architecture for embedded reconfigurable computing, based on a very-long instruction word (VLIW) processor enhanced with an additional run-time configurable datapath. The reconfigurable unit is tightly coupled with the processor, featuring an application-specific instruction-set extension. Mapping computation intensive algorithmic portions on the reconfigurable unit allows a more efficient elaboration, thus leading to an improvement in both timing performance and power consumption. A test chip has been implemented in a standard 0.18-/spl mu/m CMOS technology. The test of a signal processing algorithmic benchmark showed speedups ranging from 4.3/spl times/ to 13.5/spl times/ and energy consumption reduced up to 92%. 相似文献
3.
Arnaud Grasset Philippe Millet Philippe Bonnot Sami Yehia Wolfram Putzke-Roeming Fabio Campi Alberto Rosti Michael Huebner Nikolaos S. Voros Davide Rossi Henning Sahlbach Rolf Ernst 《International journal of parallel programming》2011,39(3):328-356
Reconfigurable computing offers a wide range of low cost and efficient solutions for embedded systems. The proper choice of the reconfigurable device, the granularity of its processing elements and its memory architecture highly depend on the type of application and their data flow. Existing solutions either offer fine grain FPGAs, which rely on a hardware synthesis flow and offer the maximum degree of flexibility, or coarser grain solutions, which are usually more suitable for a particular type of data flow and applications. In this paper, we present the MORPHEUS architecture, a versatile reconfigurable heterogeneous System-on-Chip targeting streaming applications. The presented architecture exploits different reconfigurable technologies at several computation granularities that efficiently address the different applications needs. In order to efficiently exploit the presented architecture, we implemented a complete software solution to map C applications to the reconfigurable architecture. In this paper, we describe the complete toolset and provide concrete use cases of the architecture. 相似文献
4.
M. Fratini G. Campi L. Simonelli V. Palmisano S. Agrestini M. Filippi N. L. Saini A. Bianconi 《Journal of Superconductivity and Novel Magnetism》2005,18(5-6):671-674
The interstitial oxygen ordering in a La2CuO4+ y (y = 0.08) single crystal with a T c = 38 K has been investigated. We have studied the growth dynamics of the three dimensional (3D) ordered phase, called Q2, at different temperatures under X-ray illumination. The critical temperature T 0~334 K of the order-disorder transition for the Q2 phase has been determined. We have found that the illumination of the sample with a continuous polarized synchrotron radiation X-ray flux stimulates the oxygen ordering kinetics. The photoinduced ordering process shows a threshold characteristic of cooperative phenomena and its kinetics shows a temperature dependence that is controlled by the activation energy E A = 100 meV. 相似文献
5.
V. Palmisano S. Agrestini G. Campi M. Filippi L. Simonelli M. Fratini A. Bianconi S. De Negri M. Giovannini A. Saccone A. N. Fitch M. Brunelli I. Margiolaki 《Journal of Superconductivity and Novel Magnetism》2005,18(5-6):737-741
The thermal lattice expansion in the superconducting Mg1? x Al x B2 system (x = 0, 0.13, and 0.59) has been measured using high-resolution X-ray powder diffraction. An unusual large negative thermal expansion (NTE) appears for temperatures below T * = 60 K in the MgB2. The NTE effect increases in Mg0.87Al0.13B2 and disappears at high Al content in the Mg0.59Al0.41B2 where the temperature dependence of volume follows a standard Einstein model in the whole temperature range. The anomalous behavior of the thermal expansion provides a direct evidence in the physics of diborides for the relevance of the proximity to the 2.5 Lifshitz electronic topological transition where the Fermi surface of the σband changes from a two-dimensional (2D) to a three-dimensional (3D) topology. 相似文献
6.
D. Innocenti A. Ricci N. Poccia G. Campi M. Fratini Antonio Bianconi 《Journal of Superconductivity and Novel Magnetism》2009,22(6):529-533
The phase separation between a striped polaron liquid at the particular density and a high density polaron liquid is described
by a modified Van der Waals scheme. The striped polaron liquid represents the pseudo gap matter or Wigner-like polaron phase
at 1/8 doping in cuprate superconductors. The model includes the tendency of pseudo-Jahn-Teller polarons to form anisotropic
directional bonds at a preferential volume with the formation of different “liquid phases”. The model gives the coexistence
of a first low density polaron striped liquid and a second high density liquid that appears in cuprate superconductors for
doping larger than 1/8. We discuss how the strength of anisotropic bonds controls the variation the phase separation scenarios
for complex systems in the presence of a quantum critical point where the phase separation vanishes. 相似文献
7.
Direct nonlinear control design: the virtual reference feedback tuning (VRFT) approach 总被引:3,自引:0,他引:3
This paper introduces the virtual reference feedback tuning (VRFT) approach for controller tuning in a nonlinear setup. VRFT is a data-based method that permits to directly select the controller based on data, with no need for a model of the plant. It is based on a global model reference optimization procedure and, therefore, does not require to access the plant for experiments many times so as to estimate the control cost gradient. For this reason, it represents a very appealing controller design methodology for many control applications. 相似文献
8.
L. Faustini C. Coriasso A. Stano C. Cacciatore D. Campi 《Photonics Technology Letters, IEEE》1996,8(10):1355-1357
Semiconductor integrated waveguide turning mirrors (IWTM) are investigated using the beam propagation method. A mirror is fabricated and modeled along with realistic geometries in the presence of offset and roughness of the mirror surface. An interference effect between waves reflected at different surfaces in the device is evidenced, that has strong impact on the device performance in the case of weakly-confining structures. A widely-accepted fabrication approach is criticized in view of this effect. A solution is outlined that minimizes the losses due to either technological limitations or interference. 相似文献
9.
G. Campi C. Dell'omo D. Di Castro S. Agrestini M. Filippi G. Bianconi L. Barba A. Cassetta M. Colapietro N. L. Saini A. Bianconi 《Journal of Superconductivity and Novel Magnetism》2004,17(1):137-142
Structural properties of La2CuO4.1 single crystal are studied by high-resolution synchrotron X-ray diffraction as a function of temperature and of X-ray fluence. Superstructures with a periodicity 2, along the c axis, due to a 3D long-range oxygen ordering, have been observed. The temperature-dependent study has allowed us to distinguish two order–disorder phase transitions, at 350 and 375 K for two different ordered phases, respectively. After rapid quenching from 380 to 100 K we were able to induce disorder-to-order-like transition because of a 2D rearrangement of the excess oxygen atoms in the temperature range of 130–180 K. The oxygen ordering could also be produced by X-ray beam illumination; a clear signature of X-ray-photo-induced phase transition has been found by placing the sample under high X-ray flux at 300 and 220 K. 相似文献
10.
G. Campi T. Proffen X. Qiu E. S. Bozin S. J. L. Billinge S. Agrestini N. L. Saini A. Bianconi 《Journal of Superconductivity and Novel Magnetism》2007,20(7-8):505-510
We have studied temperature evolution of the local as well as the average crystal structure of MgB2 and Mg0.5Al0.5B2 using real-space atomic pair distribution function (PDF) measured by high resolution neutron powder diffraction in a wide
temperature range of T=10–600 K. The mean square relative displacements (MSRD) of atomic B–B, B–Mg (B–Al) pairs are compared with mean-square displacements
(MSD) to calculate atomic correlations. In spite of the enhanced atomic disorder in Mg0.5Al0.5B2, where the boron–boron, and boron–magnesium pair motions are found to be small, we find that the same atomic correlations
in MgB2 assume even slightly lower values and remain nearly constant in a wide temperature range of 0–600 K. This anomalous behavior
and its physical interpretation provoke new questions on our understanding to the local lattice dynamics in this material. 相似文献