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71.
R. Kurki-Suonio 《BIT Numerical Mathematics》1969,9(3):225-238
Properties of context-free languages and grammars permitting deterministic top-down recognition with bounded lookahead are discussed. In particular, it is shown that for eachk>1 there are such languages requiring a lookahead of at leastk characters. 相似文献
72.
Peter Hall 《Journal of multivariate analysis》1983,13(2):234-256
Some types of density estimators, particularly those based on trigonometric series, converge reasonably quickly to their limit except in the neighbourhood of one or two singularities. In this situation the mean integrated square error, the traditional measure of the efficiency of a density estimator, is an unsatisfactory measure. The notion of partial mean integrated square error is introduced and used to compare the performance of trigonometric series estimators. The results lead to consideration of some new estimators which have excellent properties from the points of view of both efficiency and ease of computation. 相似文献
73.
Integrated Density of States For Random Metrics on Manifolds 总被引:3,自引:0,他引:3
Lenz Daniel; Peyerimhoff Norbert; Veselic Ivan 《Proceedings London Mathematical Society》2004,88(3):733-752
We study ergodic random Schrödinger operators on a coveringmanifold, where the randomness enters both via the potentialand the metric. We prove measurability of the random operators,almost sure constancy of their spectral properties, the existenceof a self-averaging integrated density of states and a Pasturubintype trace formula. 2000 Mathematics Subjects Classification35J10, 58J35, 82B44. 相似文献
74.
Haiyan Chen Jizhi Dai Yongzhi Liu 《International Journal of Infrared and Millimeter Waves》2004,25(12):1791-1798
IR integrated photonic amplifiers at 1.55m operation will have good foreground in optical phasedarray radars for splitters and signal processing. The saturation gain characteristics of IR integrated photonic waveguide amplifiers (taken Er3+Yb3+ co-doped phosphate glass waveguide amplifiers as an example) are studied theoretically. For the homemade laser glass materials the calculated saturation intensities are 2.22kw /cm2 for signal and 10.15kw/cm2 for pump. The effects of absorption saturation of signal and pump lights on the gain of amplifiers are discussed. 相似文献
75.
Passing across an abrupt junction from a thick vertically bimodal waveguide to a thinner single mode segment, guided light can undergo complete destructive interference, provided that the geometry and the phases of the modes in the initial segment are properly adjusted. We propose to employ this effect to realize a simple polarizer configuration, using a strip that is etched from a planar waveguide. A beam of light is made to pass the strip perpendicularly. The light enters from the single mode waveguide outside the strip into the strip segment, which is configured to support two modes. At the end of the strip, apart from reflections, the amount of power that is guided in the following lower segment depends on the local phases of the two modes. These phases are different for TE and TM light, hence we may expect a polarization dependent power transfer, resulting in polarizer performance for a properly selected geometry. The paper describes in detail the modeling of the device in terms of rigorous mode expansion. Design guidelines and tolerance requirements for geometric and material parameters are discussed. For typical Si3N4/SiO2 materials, our calculations predict a peak performance of 34 dB polarization discrimination and 0.3 dB insertion loss for a device with a total length of about 12 m that selects TE polarization at a wavelength of 1.3 m. 相似文献
76.
If (Xi, i
) is a strictly stationary process with marginal density function f, we are interested in testing the hypothesis H0: {f=f0}, where f0 is given. We consider different test statistics based on integrated quadratic forms measuring the proximity between fn, a kernel estimator of f, and f0, or between fn and its expected value computed under H0. We study the asymptotic local power properties of the testing procedures under local alternatives. This study generalizes to the multidimensional case in a context of dependence the corresponding one made by P. J. Bickel and M. Rosenblatt in 1973 (Ann. Statist.1, 1071–1095). 相似文献
77.
Consider the Almost Mathieu operator H
= cos 2(k +)+ on the lattice. It is shown that for large , the integrated density of states is Hölder continuous of exponent <
. This result gives a precise version in the perturbative regime of recent work by M. Goldstein and W. Schlag on Hölder regularity of the integrated density of states for 1D quasi-periodic lattice Schrödinger operators, assuming positivity of the Lyapunov exponent (and proven by different means). Our approach provides also a new way to control Green's functions, in the spirit of the author's work in KAM theory. It is by no means restricted to the cosine-potential and extends to band operators. 相似文献
78.
Zernike多项式是光机热集成分析中实现光、机、热各分析软件之间数据传递的重要工具。许多光学元件表面形状并不满足Zernike多项式的正交性条件,使有限元分析不能精确拟合光学元件表面变形及变形产生的各项像差。讨论影响Zernike正交性的几个因素,详细介绍将有限元分析得到的光学表面变形数据导入光学分析软件的一种新方法——干涉图插值法。该方法避开Zernike多项式拟合,在去除镜面刚体位移后将镜面畸变精确地表示成干涉图数据,直接生成数据接口。 相似文献
79.
We proposed in this study a novel analog complementary metal oxide semiconductor (CMOS) circuit for generating a motion signal
when an object moves, which is a simple structure. The proposed unit circuit was constructed using a previously proposed edge
detection circuit and a novel proposed circuit for generating a motion signal which accepts an edge signal. The part for generating
the motion signal was constructed using six metal oxide semiconductor (MOS) transistors and one capacitor. Results obtained
by the simulation program with integrated circuit emphasis (SPICE) and the measured results of a test circuit constructed
with discrete MOS transistors and the test circuit fabricated with a 1.2 μm CMOS process showed that the proposed unit circuit
can output pulsed current (motion signal) when an object moves on the circuit. It was clarified from the SPICE results that
the two-dimensional network constructed with proposed unit circuits can output motion signals. The size of the novel unit
circuit is expected to be about 110 × 110μm2 obtained by the 1.2 μm CMOS process. It is possible to arrange 90 × 90 unit circuits on a chip which has an area of 1 × 1cm2. The aperture ratio is expected to be about 21%, which is twice as large as that of the previously proposed circuit. An integrated
circuit for image processing in real time can thus be realized by applying the two-dimensional network constructed with the
proposed circuits. 相似文献
80.
In this paper, a new channel drop filter in two dimensional photonic crystals with mirror cavities is proposed. In the structure,
three cavities are used. One is used for a resonant tunneling-based channel drop filter. The others are used to realize reflection
feedback in the bus waveguide, which consists of a point defect micro-cavity side-coupled to a waveguide. The simulation results
by using the finite-difference time-domain method conclude 98% output efficiency. 相似文献