[Todos] Fwd: Próximos seminarios del IFLP/Dto Fisica

Mie Jun 28 08:52:43 ART 2017

-------- Mensaje original -------- 

 		ASUNTO:
 		Próximos seminarios del IFLP/Dto Fisica

 		FECHA:
 		2017-06-28 08:51

 		REMITENTE:
 		Maria Virginia Manias <virmanias at gmail.com>

 		DESTINATARIO:
 		secre at biol.unlp.edu.ar, secre at mate.unlp.edu.ar,
secretaria at inifta.unlp.edu.ar, iflysib at iflysib.unlp.edu.ar,
fcnym at museo.fcnym.unlp.edu.ar, info at ciop.unlp.edu.ar,
academic at fcaglp.unlp.edu.ar, todos at fisica.unlp.edu.ar, Secretaria del
Dpto.de Física <secre2 at fisica.unlp.edu.ar>

 		COPIA:
 		Osvaldo Anibal Rosso <oarosso at gmail.com>, Fernando Fabian Montani
<fmontani at gmail.com>

Estimados, 

Les agradezco la difusión del anuncio de los próximos seminarios del
Ciclo de Coloquios y Seminarios que se organizan el Instituto de Física
La Plata y el Departamento de Física.  

Se adjunta el archivo para difundir en carteleras. 

Saludos cordiales,
Virginia Manías - Secretaria Científica del IFLP

SEMINARIOS  DEL IFLP Y DEL DEPARTAMENTO 

JUEVES 29 DE JUNIO – 15 HS 

AULA CHICA 

TÍTULO: "CLASSIFICATION AND VERIFICATION OF HANDWRITTEN SIGNATURES WITH
TIME CAUSAL INFORMATION THEORY QUANTIFIERS" 

EXPOSITOR: OSVALDO A. ROSSO (1,2,3) 

(1) DEPARTAMENTO DE INFORMÁTICA EN SALUD, HOSPITAL ITALIANO DE BUENOS
AIRES, ARGENTINA. 

(2) INSTITUTO DE FÍSICA, UNIVERSIDADE FEDERAL DE ALAGOAS (UFAL), MACEIÓ,
BRAZIL. 

(3) FACULTAD DE INGENIERÍA Y CIENCIAS APLICADAS, UNIVERSIDAD DE LOS
ANDES, SANTIAGO, CHILE. 

RESUMEN: Handwritten signature verification is a behavioral biometric
modality that relies on a rapid personal gesture. Each hand-drawn
signature has a level of complexity which depends on the author. Among
all the biometric traits that can be categorized as pure behavioral, the
signature is the one that has the widest social acceptance for identity
authentication. Online signature verification allows the introduction of
the signature's dynamic information, not just the outcome of the signing
process. Such dynamical information is captured by a digitizer, and
generates ``online" signatures, namely a sequence of sampled points
during the signing process: (x,y)(t), the coordinate x and y at time t.
We present a new approach for handwritten signature classification and
verification based on descriptors stemming from time causal Information
Theory. The proposal uses the Shannon Entropy, the Statistical
Complexity, and the Fisher Information evaluated over the Bandt and
Pompe symbolization of the horizontal and vertical coordinates of
signatures. These measures are used as the input features of a signature
verification system, whose performance is assessed over the well known
MCTY 100 signature data base. The above six features previously
mentioned are easy and fast to compute, and they are the input to an
One-Class Support Vector Machine classifier. The results produced
surpass state-of-the-art online techniques that employ
higher-dimensional feature spaces which often require specialized
software and hardware. We assess the consistency of our proposal with
respect to the size of the training sample, and we also use it to
classify the signatures into meaningful groups. In summary, our results
are competitive in terms of acceptance and rejection errors, and is
shown very attractive in terms of computational requirements  

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MARTES 4 DE JULIO – 10:30 HS 

AULA CHICA 

TÍTULO: "X-RAY ABSORPTION SPECTROSCOPIES TO STUDY BULK, SURFACES AND
NANOPARTICLES" 

EXPOSITOR: YVES JOLY 

_Neel Institute, Grenoble, France_ 

RESUMEN: It is known for more than 30 years that quantum Dirac fermions
in odd dimensional spaces possess the so called parity anomaly related
to the spectral asymmetry of the Dirac operator. As a result, the
Chern-Simons action with the level k=1/2 is induced in 3D. We have
studied Dirac fermions on four-dimensional manifolds with boundaries and
demonstrated that a similar phenomenon takes place: spectral asymetry of
the Dirac operator leads to a boundary Chern-Simons term. We found a
somewhat unusual Chern-Simons level k=1/4, which is however consistent
with the counting of boundary degrees of freedom.
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