1,345 research outputs found
ZONING DESIGN FOR HANDWRITTEN NUMERAL RECOGNITION
Microsoft, Motorola, Siemens, Hitachi, IAPR, NICI, IUF
In the field of Optical Character Recognition (OCR), zoning is used to extract topological information from patterns. In this paper zoning is considered as the result of an optimisation problem and a new technique is presented for automatic zoning. More precisely, local analysis of feature distribution based on Shannon's entropy estimation is performed to determine "core" zones of patterns. An iterative regiongrowing procedure is applied on the "core" zones to determine the final zoning
A PERTURBATIONBASED APPROACH FOR MULTICLASSIFIER SYSTEM DESIGN
Microsoft, Motorola, Siemens, Hitachi, IAPR, NICI, IUF
This paper presents a perturbationbased approach useful to select the best combination method for a multiclassifier system. The basic idea is to simulate small variations in the performance of the set of classifiers and to evaluate to what extent they influence the performance of the combined classifier. In the experimental phase, the Behavioural Knowledge Space and the DempsterShafer combination methods have been considered. The experimental results, carried out in the field of handwritten numeral recognition, demonstrate the effectiveness of the new approach
A framework for distributed interaction in intelligent environments
Ubiquitous computing is extending its applications to an increasing number of domains. "Monolithic" approaches use centralised systems, controlling devices and users' requests. A different solution can be found in works proposing "distributed" intelligent devices that communicate, without a central reasoner, creating little communities to support the user. If the former approach uses all the available sensors being more easily context-aware, the latter is scalable and naturally supports multiple users.
In this work we introduce a model for a distributed network of entities in Intelligent Environments. Each node satisfies users' requests through Natural User Interfaces. If a node cannot produce the expected output, it communicates with others in the network, generating paths where the final target is undetermined and intermediate nodes do not understand the request; this is the focus of our work. The system learns parameters and connections in the initial topology. We tested the system in two scenarios. Our approach finds paths close to the optimum with reasonable connections
Energy Management Strategy for Hybrid Multimode Powertrains: Influence of Inertial Properties and Road Inclination
Multimode hybrid powertrains have captured the attention of automotive OEMs for their flexible nature and ability to provide better and optimized efficiency levels. However, the presence of multiple actuators, with different efficiency and dynamic characteristics, increases the problem complexity for minimizing the overall power losses in each powertrain operating condition. The paper aims at providing a methodology to select the powertrain mode and set the reference torques and angular speeds for each actuator, based on the power-weighted efficiency concept. The power-weighted efficiency is formulated to normalize the efficiency contribution from each power source and to include the inertial properties of the powertrain components as well as the vehicle motion resistance forces. The approach, valid for a wide category of multimode powertrain architectures, is then applied to the specific case of a two-mode hybrid system where the engagement of one of the two clutches enables an Input Split or Compound Split operative mode. The simulation results obtained with the procedure prove to be promising in avoiding excessive accelerations, drift of powertrain components, and in managing the power flow for uphill and downhill vehicle conditions
Evidence for a redshifted excess in the intracluster light fractions of merging clusters at
The intracluster light (ICL) fraction is a well-known indicator of the
dynamical activity in intermediate-redshift clusters. Merging clusters in the
redshift interval have a distinctive peak in the ICL fractions
measured between \AA. In this work, we analyze two
higher-redshift, clearly merging clusters, ACT-CLJ0102-49151 and CL
J0152.7-1357, at , using the HST optical and infrared images obtained by
the RELICS survey. We report the presence of a similar peak in the ICL
fractions, although wider and redshifted to the wavelength interval \AA. The fact that this excess in the ICL fractions is found at
longer wavelengths can be explained by an assorted mixture of stellar
populations in the ICL, direct inheritance of an ICL that was mainly formed by
major galaxy mergers with the BCG at and whose production is
instantaneously burst by the merging event. The ubiquity of the ICL fraction
merging signature across cosmic time enhances the ICL as a highly reliable and
powerful probe to determine the dynamical stage of galaxy clusters, which is
crucial for cluster-based cosmological inferences that require relaxation of
the sample.Comment: 11 pages, 3 figures, accepted for publication in ApJ
Classical Effects of Laser Pulse Duration on Strong-field Double Ionization
We use classical electron ensembles and the aligned-electron approximation to
examine the effect of laser pulse duration on the dynamics of strong-field
double ionization. We cover the range of intensities
for the laser wavelength 780 nm. The classical scenario suggests that the
highest rate of recollision occurs early in the pulse and promotes double
ionization production in few-cycle pulses. In addition, the purely classical
ensemble calculation predicts an exponentially decreasing recollision rate with
each subsequent half cycle. We confirm the exponential behavior by trajectory
back-analysis
Why does the increase of plasmin worsen the coagulation properties of milk in dairy sheep?
The concentrations of whole casein and fat are the factors which play the most important
role in determining the cheese-making qualities of milk. Plasmin (PL) is the main proteolytic enzyme in
milk and has been found to be associated with enhanced casein hydrolysation. ß-casein is the most susceptible
to breakdown by this enzyme. Most of the enzyme is in the form of the inactive zymogene plasminogen
(PG), which is converted to PL by the action of PG activators. PL activity is also associated with alteration of
mammary epithelium permeability and a subsequent increase in paracellular flow. These proteolytic activities
worsen the milk quality, coagulation properties and cheese yield. The level of PL in milk increases towards the
end of lactation, with mastitis, and with the increasing age of the animals. At present the relationship between
PL, SCC and casein are not clearly defined. Some authors found positive relationships between PL and SCC
with CN (Baldi et al., 1996; Bianchi et al., 2004), others negative (Fantuz et al., 2001), and some have found no
relationship (Albenzio et al., 2004). The aim of this work was to study why milk with higher PL content has
worse coagulation properties
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