In direction-of-arrival (DOA) estimation, the direction of a signal is usually assumed to be a point. If the direction of a signal is distributed due to some environmental phenomenon, however, DOA estimation methods based on the point source assumption may result in poor performance. In this paper, we consider DOA estimation when the signal sources are distributed. Parametric and nonparametric ...

In a number of disciplines, directional data provides a fundamental source of information. A novel framework for isotropic and anisotropic di usion of directions is presented in this paper. The framework can be applied both to regularize directional data and to obtain multiscale representations of it. The basic idea is to apply and extend results from the theory of harmonic maps in liquid cryst...

A tractable model of pricing under directed search is proposed and integrated with a position auction for better slots (which rationalizes the consumer search order). Search is always inefficiently low because firms price out further exploration. Equilibrium product prices are such that the marginal consumer’s surplus decreases in the order of search. Consumers always find it optimal to follow ...

JCB • VOLUME 175 • NUMBER 1 • 2006 4 R egeneration after liver damage requires caveolin and lipid droplets, according to Manuel Fernández, Cecilia Albor (Universitat de Barcelona, Spain), Albert Pol, Robert Parton (University of Queensland, Brisbane, Australia), and colleagues. The results suggest that caveolin helps process or package storage lipids, and that the system somehow communicates wi...

Although the application of data fusion in information retrieval has yielded good results in the majority of the cases, it has been noticed that its achievement is dependent on the quality of the input result lists. In order to tackle this problem, in this paper we explore the combination of only the n-top result lists as an alternative to the fusion of all available data. In particular, we des...

The weight distribution {W C }w=0 of a linear code C ⊂ Fq is put in an explicit bijective correspondence with Duursma’s reduced polynomial DC(t) ∈ Q[t] of C. We prove that the Riemann Hypothesis Analogue for a linear code C requires the formal self-duality of C and imposes an upper bound on the cardinality q of the basic field, depending on the dimension and the minimum distance of C. Duursma’s...

Stone-Weierstrass-type theorems for groups of group-valued functions with discrete range or discrete domain are obtained. We study criteria for a subgroup of the group of continuous functions C(X,G) (X compact, G a topological group) to be uniformly dense. These criteria are based on the existence of so-called condensing functions, where a continuous function φ : G → G is said to be condensing ...

Submitted on 10/25/2013 and approved on 04/14/2015. 1 This work is part of PhD research of the first author. Financial support: CNPq. 2 Universidade de Brasília, Brasilia, DF, Brazil. [email protected] 3 Embrapa Hortaliças, Brasília, DF, Brazil. [email protected] 4 Universidade Catolica de Brasília, Brasilia, DF, Brazil. [email protected] 5 Universidade Federal do Rio de Janeiro, Rio de Ja...