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排序方式: 共有119条查询结果,搜索用时 15 毫秒
11.
12.
A new, vectorial approach to fast correlation attacks on binary memoryless combiners is proposed. Instead of individual input sequences or their linear combinations, the new attack is targeting subsets of input sequences as a whole thus exploiting the full correlation between the chosen subset and the output sequence. In particular, the set of all the input sequences can be chosen as the target. The attack is based on a novel iterative probabilistic algorithm which is also applicable to general memoryless combiners over finite fields or finite rings. To illustrate the effectiveness of the introduced approach, experimental results obtained for random balanced combining functions are presentedMost of this work was done while he was with Rome CryptoDesign Center, Gemplus, Italy 相似文献
13.
Non enzymatic hydration of leukotriene A (), the biogenetic precursor of leukotriene B () affords among other products two diastereomeric 6--isomers of 2, the first stereospecific and efficient syntheses of which are recorded herein. 相似文献
14.
We consider and compare four Hamiltonian formulations of thermostated mechanics, three of them kinetic, and the other one configurational. Though all four approaches "work" at equilibrium, their application to many-body nonequilibrium simulations can fail to provide a proper flow of heat. All the Hamiltonian formulations considered here are applied to the same prototypical two-temperature "phi4" model of a heat-conducting chain. This model incorporates nearest-neighbor Hooke's-Law interactions plus a quartic tethering potential. Physically correct results, obtained with the isokinetic Gaussian and Nose-Hoover thermostats, are compared with two other Hamiltonian results. The latter results, based on constrained Hamiltonian thermostats, fail to model correctly the flow of heat. 相似文献
15.
ABSTRACTWe develop a bit-reversible implementation of Milne's fourth-order predictor algorithm so as to generate precisely time-reversible simulations of irreversible processes. We apply our algorithm to the collision of two zero-temperature Morse-potential balls, which collide to form a warm liquid oscillating drop. The oscillations are driven by surface tension and damped by the viscosities. We characterise the ‘important’ Lyapunov-unstable particles during the collision and equilibration phases in both time directions to demonstrate the utility of the Milne algorithm in exposing ‘Time's Arrow’. 相似文献
16.
M. Fred Hoover 《高分子科学杂志,A辑:纯化学与应用化学》2013,50(6):1327-1418
This paper is a literature survey of quaternary ammonium, sulfonium, and phosphonium polymers. 相似文献
17.
M. A. Mortazavi A. Knoesen S. T. Kowel R. A. Henry J. M. Hoover G. A. Lindsay 《Applied physics. B, Lasers and optics》1991,53(5-6):287-295
Second-order nonlinear optical properties of newly designed and synthesized coumaromethacrylate side-chain polymers are reported. The optimum poling conditions were determined experimentally. The optimum poling temperature for these side-chain polymers is well above the glass transition temperature. The second harmonic coefficient of films poled by coronaonset at elevated temperature and the linear electro-optic coefficient of films poled by contact electrodes were measured. The stabilized value of the second harmonic coefficient, d
33, at 1064nm fundamental wavelength was found to be 13 pm/V. The linear electro-optic coefficient, r
33, exhibits strong dispersion ranging from 2 to 12pm/V in the wavelength range 477 to 1115 nm. 相似文献
18.
D. N. Hoover 《Probability Theory and Related Fields》1991,89(3):239-259
Summary This paper proves some Skorokhod Convergence Theorems for processes with filtration. Roughly, these are theorems which say that if a family of processes with filtration (X
n
,
n
),n, converges in distribution in a suitable sense, then there exists a family of equivalent processes (Y
n
,
n
),n, which converges almost surely. The notion of equivalence used is that of adapted distribution, which guarantees that each (X
n
,
n
) has the same stochastic properties as (X
n
,
n
), with respect to its filtration, such as the martingale property or the Markov property. The appropriate notion of convergence in distribution is convergence in adapted distribution, which is developed in the paper. Fortunately, any tight sequence of processes has a subsequence which converges in adapted distribution. For discrete time processes, (Y
n
,
n
),n, and their limit (Y, ) may be taken as all having the same fixed filtration
n
=. In the continuous time case, theY
n
,
n
may require different filtrations
n
, which converge to. To handle this, convergence of filtrations is defined and its theory developed.During part of the time this work was in progress, it was supported by an NSERC operating grant, and the author was an NSERC University Research Fellow. The author wishes to thank the Steklov Mathematical Institute of the Soviet Academy of Sciences for its hospitality while the principle research in this paper was being begun, A.N. Shiryaev and P.C. Greenwood, who made the author's visit there possible, and Ján Miná for his hospitality while that research was being finished. We thank the referee who suggested the results in Sect. 12 相似文献
19.
Bruins EE Bauer TS den Bok HW Duif CP van Hoek WC de Lange DJ Misiejuk A Papandreou Z Sichtermann EP Tjon JA Willering HW Yeomans DM Reike H Durek D Frommberger F Gothe R Jakob D Kranefeld G Kunz C Leiendecker N Pfeiffer G Putsch H Reichelt T Schoch B Wacker D Wehrmeister D Wilhelm M Jans E Konijn J de Vries R Furget C Voutier E Arenhövel H 《Physical review letters》1995,75(1):21-24
20.