منابع مشابه
The Archimedean Truncated Octahedron , and Packing of Geometric Units in Cubic Crystal Structures
Any cubic crystal structure can be divided into small units in the form of congruent semi-regular (Archimedean) truncated octahedra. The centers of these polyhedra can be chosen at invariant equivalent positions for most cubic space groups. The part of a 0567-7394/79/060946-07501.00 crystal structure enclosed by an Archimedean polyhedron is called a geometric unit (or unit for short); however, ...
متن کاملTruncated importance sampling
Importance sampling is a fundamental Monte Carlo technique. It involves generating a sample from a proposal distribution in order to estimate some property of a target distribution. Importance sampling can be highly sensitive to the choice of proposal distribution, and fails if the proposal distribution does not sufficiently well approximate the target. Procedures which involve truncation of la...
متن کاملIncremental Truncated LSTD
Balancing between computational efficiency and sample efficiency is an important goal in reinforcement learning. Temporal difference (TD) learning algorithms stochastically update the value function, with a linear time complexity in the number of features, whereas least-squares temporal difference (LSTD) algorithms are sample efficient but can be quadratic in the number of features. In this wor...
متن کاملTruncated Differentials and Skipjack
We consider a range of attacks on reduced-round variants of the block cipher Skipjack. In particular we concentrate on the role of truncated differentials and consider what insight they give us into the design and long-term security of Skipjack. An attack on the full 32 rounds of Skipjack remains elusive. However we give attacks on the first 16 rounds of Skipjack that can efficiently recover th...
متن کاملFrom Truncated Series Expansions
Knowledge of a truncated Fourier series expansion for a discontinuous 2^-periodic function, or a truncated Chebyshev series expansion for a discontinuous nonperiodic function defined on the interval [-1, 1], is used in this paper to accurately and efficiently reconstruct the corresponding discontinuous function. First an algebraic equation of degree M for the M locations of discontinuities in e...
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ژورنال
عنوان ژورنال: Journal of Number Theory
سال: 1992
ISSN: 0022-314X
DOI: 10.1016/0022-314x(92)90082-z