نتایج جستجو برای: topological ordering
تعداد نتایج: 104108 فیلتر نتایج به سال:
We give a constructive proof of Kruskal’s Tree Theorem— precisely, of a topological extension of it. The proof is in the style of a constructive proof of Higman’s Lemma due to Murthy and Russell (1990), and illuminates the role of regular expressions there. In the process, we discover an extension of Dershowitz’ recursive path ordering to a form of cyclic terms which we call μ-terms. This all c...
We show that one-dimensional topological objects (kinks) are natural degrees of freedom for an antiferromagnetic Ising model on a triangular lattice. Its ground states and the coexistence of spin ordering with an extensive zero-temperature entropy can easily be understood in terms of kinks forming a hard-sphere liquid. Using this picture we explain effects of quantum spin dynamics on that frust...
Boundaries are closely related to shape and it is in the context of shape representation that the problem of undetermined boundaries appears in spatial reasoning. Shape indeterminacy may occur at different levels of abstraction, namely at the topological and the geometrical level. It shows that there is quite a gap in expressiveness between the topological and the geometrical approaches to shap...
We propose a hardware-assisted visibility ordering algorithm. From a given viewpoint, a (back-to-front) visibility ordering of a set of objects is a partial order on the objects such that if object obstructs object , then precedes in the ordering. Such orderings are useful because they are the building blocks of other rendering algorithms such as direct volume rendering of unstructured grids. T...
Modern ultrafast techniques provide new insights into the dynamics of ions, charges, and spins in photoexcited nanostructures. In this review, we describe the use of time-resolved electron-based methods to address specific questions such as the ordering properties of self-assembled nanoparticles supracrystals, the interplay between electronic and structural dynamics in surfaces and adsorbate la...
In this paper the basic principles and developments of an unsu-pervised learning algorithm, the Self-Organizing Map (SOM) and a supervised learning algorithm, the Learning Vector Quantization (LVQ) are explained. Some practical applications of the algorithms in data analysis, data visual-ization and pattern recognition tasks are mentioned. In the end of the paper new results are reported about ...
In this paper we prove some stochastic comparisons results for progressive type II censored order statistics. The problem of stochastically comparing concomitants of the two progressive type II censored order statistics with possibly different schemes, under different kinds of dependence between X and Y is considered and it is proved that if Y is stochastically increasing (decreasing) in X, ...
The classifier chains algorithm is aimed at solving the multilabel classification problem by composing labels into a randomized label order. effect of this depends heavily on whether order optimal. To obtain better ordering, authors propose based maximum spanning tree and directed acyclic graph. first uses Pearson's correlation coefficient to calculate between constructs labels, then calculates...
The recently discovered kagome net compounds AV3Sb5 (A = K, Rb, and Cs) become superconducting on cooling, in addition to displaying interesting topological features the electronic structure. They also exhibit charge density wave ordering, which manifests as a breathing-mode distortion layers. It has been suggested that such ordering derives from nesting between saddle points Fermi surface. In ...
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