This talk is based on a joint paper with A. Bonami and G. Garrigós [3] in which the phase retrieval problem for the Radar Ambiguity Function (i.e. the Radar Ambiguity Problem) has been tackled. In particular it was shown that for wide classes of signals, the radar ambiguity problem has a unique solution, up to trivial transformations. In the second part of the talk, we report on ongoing work by...

By using the fractional Fourier transformation of the time-domain signals, closed-form expressions for the projections of their auto or cross ambiguity functions are derived. Based on a similar formulation for the projections of the auto and cross Wigner distributions and the well known two-dimensional (2-D) Fourier transformation relationship between the ambiguity and Wigner domains, closed-fo...

Al-Najjar and Weinstein 2009 propose to scrutinize the implications of recent theories of ambiguity in dynamic settings. They conclude that such implications are so unreasonable as to cast doubts on the legitimacy of the theories under consideration. The present paper argues that the seemingly unreasonable implications highlighted by Al-Najjar and Weinstein can be understood as the result of ba...

ln this paper, we describe an approach to planning sensing slralegies dynamically, based on the system’s current best information about the world. Our approach is for the system to automatically propose a sensing operation, and then to determine the maximum ambiguity which might remain in the world description if that sensing operation were applied. The system then applies that sensing operatio...

We analyze a market populated by expected utility maximizers and smooth ambiguity-averse consumers. We study conditions under which ambiguity-averse consumers survive and affect prices in the limit. If ambiguity vanishes with time or if the economy exhibits no aggregate risk, ambiguity-averse consumers survive, but have no long-run impact on prices. In both scenarios, ambiguity-averse consumers...

W pres Hum Coli mou drew stati prov datio auth guag tiona Tech ect sear A Grod NE2 8654 work has been equivocal regarding syntactic influences because it has examined ambiguities where there is little or no resource differential between competing alternatives. The candidate structures of the ambiguities explored here incur substantially different storage costs. The results indicate that storage...

A central issue in the study of sentence processing is the manner in which various sources of information are used in resolving structural ambiguities. According to one proposal, the garden path model (e.g., Frazier & Rayner, 1982), perceivers are initially guided by strategies based solely on the structural properties of sentences. Another class of models, constraint satisfaction mod~ls, empha...

In this paper we extend the cube-pruned dependency parsing framework of Zhang et al. (2012; 2013) by forcing inference to maintain both label and structural ambiguity. The resulting parser achieves state-ofthe-art accuracies, in particular on datasets with a large set of dependency labels.

We present a standoff annotation framework for the integration of NLP components, currently implemented in the context of the DELPH-IN tools1. This provides a flexible standoff pointer scheme suitable for various types of data, a lattice encodes structural ambiguity, intraannotation relationships are encoded, and annotations are decorated with structured content. We provide an XML serialization...

I explore some of the issues that arise when trying to establish a connection between the underspecification hypothesis pursued in the NLP literature and work on ambiguity in semantics and in the psychological literature. A theory of underspecification is developed ‘from the first principles’, i.e., starting from a definition of what it means for a sentence to be semantically ambiguous and from...