4,804 research outputs found
Human motion retrieval based on freehand sketch
In this paper, we present an integrated framework of human motion retrieval based on freehand sketch. With some simple rules, the user can acquire a desired motion by sketching several key postures. To retrieve efficiently and accurately by sketch, the 3D postures are projected onto several 2D planes. The limb direction feature is proposed to represent the input sketch and the projected-postures. Furthermore, a novel index structure based on k-d tree is constructed to index the motions in the database, which speeds up the retrieval process. With our posture-by-posture retrieval algorithm, a continuous motion can be got directly or generated by using a pre-computed graph structure. What's more, our system provides an intuitive user interface. The experimental results demonstrate the effectiveness of our method. © 2014 John Wiley & Sons, Ltd
2-(2-Chlorophenyl)-2,3-dihydroquinazolin-4(1H)-one
The title compound, C14H11ClN2O, was synthesized by the reaction of 2-chlorobenzaldehyde and 2-aminobenzamide in an ionic liquid. The pyrimidine ring adopts a skew-boat conformation and the two benzene rings make a dihedral angle of 87.1 (1)°. In the crystal, N—H⋯O and C—H⋯N hydrogen bonding links the molecules along b
Development of long-range phase coherence on the Kondo lattice
Despite of many efforts, we still lack a clear picture on how heavy electrons
emerge and develop on the Kondo lattice. Here we introduce a key concept named
the hybridization bond phase and propose a scenario based on phase correlation
to address this issue. The bond phase is a gauge-invariant quantity combining
two onsite hybridization fields mediated by inter-site magnetic correlations.
Its probabilistic distribution decays exponentially with site distance, from
which a characteristic length scale can be extracted to describe the spatial
correlation of Kondo hybridizations. Our calculations show that this
correlation length grows logarithmically with lowering temperature at large
Kondo coupling, and reveal a precursor pseudogap state with short-range phase
correlation before long-range phase coherence is developed to form the Kondo
insulating (or heavy electron) state at low temperatures. This provides a
potential microscopic explanation of the two-stage hybridization proposed by
recent pump-probe experiment and the logarithmic scaling in the
phenomenological two-fluid model. Our work offers a novel theoretical framework
to describe the phase-related physics in Kondo lattice systems.Comment: 9 pages, 5 figure
A Revised Optimal Spanning Table Method for Expanding Competence Sets
The optimal expansion problem of competence sets can be solves by either mathematical programming method or table based method developed by Feng (2001). Compared to the mathematical programming method, table based method for competence set expansion is a more efficient algorithm in using relevant tableaus to solve the optimal expansion problems. This paper proposes a revised table based method to facilitate developing a computer code. A computer program, called TBM, based on the revised algorithm, was developed to solve the large scale problems of expanding competence sets. A numerical example is given, and some possible future research topics on the related theme are discussed. Keywords: competence set expansion; habitual domains; spanning table methodRésumé: Le problème de l'expansion optimale des ensembles de compétence peut être résolu soit par la méthode de programmation mathématique, soit par une méthode basée sur les tableaux développée par Feng (2001). Comparée à la méthode de programmation mathématique, la méthode basée sur les tableaux pour l'expansion des ensembles de compétence est un algorithme plus efficace dans l'utilisation des tableaux appropriés pour résoudre les problèmes d'expansion optimale. Cet article propose une méthode basée sur les tableaux révisé pour faciliter l'élaboration d'un code informatique. Un programme d'ordinateur, appelé TBM, basé sur l'algorithme révisé, a été développé pour résoudre les problèmes de l'expansion des ensembles de compétences à grande échelle. Un exemple numérique est donné, et quelques sujets possibles de futures recherches sur le thème sont débattues.Mots-clés: expansion des ensembles de competences; domaines habituels; méthode de tableau construi
N′-[6-(3,5-Dimethylpyrazol-1-yl)-1,2,4,5-tetrazin-3-yl]propanohydrazide
In the title compound, C10H14N8O, the tetrazine and pyrazole rings form a dihedral angle of 48.81 (2)°. In the crystal, intermolecular N—H⋯N and N—H⋯O hydrogen bonds link the molecules into layers parallel to (101)
Projective-anticipating, projective, and projective-lag synchronization of time-delayed chaotic systems on random networks
We study projective-anticipating, projective, and projective-lag
synchronization of time-delayed chaotic systems on random networks. We relax
some limitations of previous work, where projective-anticipating and
projective-lag synchronization can be achieved only on two coupled chaotic
systems. In this paper, we can realize projective-anticipating and
projective-lag synchronization on complex dynamical networks composed by a
large number of interconnected components. At the same time, although previous
work studied projective synchronization on complex dynamical networks, the
dynamics of the nodes are coupled partially linear chaotic systems. In this
paper, the dynamics of the nodes of the complex networks are time-delayed
chaotic systems without the limitation of the partial-linearity. Based on the
Lyapunov stability theory, we suggest a generic method to achieve the
projective-anticipating, projective, and projective-lag synchronization of
time-delayed chaotic systems on random dynamical networks and find both the
existence and sufficient stability conditions. The validity of the proposed
method is demonstrated and verified by examining specific examples using Ikeda
and Mackey-Glass systems on Erdos-Renyi networks.Comment: 14 pages, 6 figure
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