216,894 research outputs found
Flatness and Monge parameterization of two-input systems, control-affine with 4 states or general with 3 states
This paper studies Monge parameterization, or differential flatness, of
control-affine systems with four states and twocontrols. Some of them are known
to be flat, and this implies admitting a Monge parameterization. Focusing on
systems outside this class, we describe the only possible structure of such a
parameterization for these systems, and give a lower bound on the order of this
parameterization, if it exists. This lower-bound is good enough to recover the
known results about "(x,u)-flatness" of these systems, with much more
elementary techniques
Dual parameterization of generalized parton distributions and description of DVCS data
We discuss a new leading-order parameterization of generalized parton
distributions of the proton, which is based on the idea of duality. In its
minimal version, the parameterization is defined by the usual quark singlet
parton distributions and the form factors of the energy-momentum tensor. We
demonstrate that our parameterization describes very well the absolute value,
the Q^2-dependence and the W-dependence of the HERA data on the total DVCS
cross section and contains no free parameters in that kinematics. The
parameterization suits especially well the low-x_{Bj} region, which allows us
to advocate it as a better alternative to the frequently used double
distribution parameterization of the GPDs.Comment: 13 pages, 2 figures, LaTeX. Revised version: equation for the DVCS
cross section corrected; one reference added; numerical results did not
chang
On the Computation Power of Name Parameterization in Higher-order Processes
Parameterization extends higher-order processes with the capability of
abstraction (akin to that in lambda-calculus), and is known to be able to
enhance the expressiveness. This paper focuses on the parameterization of
names, i.e. a construct that maps a name to a process, in the higher-order
setting. We provide two results concerning its computation capacity. First,
name parameterization brings up a complete model, in the sense that it can
express an elementary interactive model with built-in recursive functions.
Second, we compare name parameterization with the well-known pi-calculus, and
provide two encodings between them.Comment: In Proceedings ICE 2015, arXiv:1508.0459
A Hybrid Parameterization Technique for Speaker Identification
Classical parameterization techniques for Speaker Identification use the codification of the power spectral density of raw speech, not discriminating between articulatory features produced by vocal tract dynamics (acoustic-phonetics) from glottal source biometry. Through the present paper a study is conducted to separate voicing fragments of speech into vocal and glottal components, dominated respectively by the vocal tract transfer function estimated adaptively to track the acoustic-phonetic sequence of the message, and by the glottal characteristics of the speaker and the phonation gesture. The separation methodology is based in Joint Process Estimation under the un-correlation hypothesis between vocal and glottal spectral distributions. Its application on voiced speech is presented in the time and frequency domains. The parameterization methodology is also described. Speaker Identification experiments conducted on 245 speakers are shown comparing different parameterization strategies. The results confirm the better performance of decoupled parameterization compared against approaches based on plain speech parameterization
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