New semi-blind approach to optimize turbo decoding for a cauchy α-stable impulsive noise channel

Knowledge of the noise parameters that contaminate the signal sent is  very important for many communication systems. In this work, we propose a new method to estimate the dispersion parameter of a  symmetric α-stable impulse noise (SαS) of Cauchy, from the received signal only at the iterative decoder (turbo decoder). This method is based on the FLOS (Fractional Lower Order Statistics) and the probability that binds the received signal and the signal sent in BPSK modulation (Binary Phase Shift Keying). The results obtained, in terms of RMSE (Root Mean Square Error) and BER (Bit Error Rate) show the precision and the efficiency of our approach.Keywords: Cauchy impulse noise SαS, dispersion parameter, FLOS, RMSE, BER

Variational formulas of higher order mean curvatures

In this paper, we establish the first variational formula and its Euler-Lagrange equation for the total $2p$-th mean curvature functional $\mathcal {M}_{2p}$ of a submanifold $M^n$ in a general Riemannian manifold $N^{n+m}$ for $p=0,1,...,[\frac{n}{2}]$. As an example, we prove that closed complex submanifolds in complex projective spaces are critical points of the functional $\mathcal {M}_{2p}$, called relatively $2p$-minimal submanifolds, for all $p$. At last, we discuss the relations between relatively $2p$-minimal submanifolds and austere submanifolds in real space forms, as well as a special variational problem.Comment: 13 pages, to appear in SCIENCE CHINA Mathematics 201

THE SIMPLE MONO-CANAL ALGORITHM FOR THE TEMPERATURE ESTIMATING OF THE SURFACE FROM IMAGES OF INFRARED THERMAL CANAL OF METEOSAT

The knowledge of the surface temperature is strongly required in several applications, for instance in agrometeorology, climatology and environmental studies. In this study we have developed an algorithm mono-canal to estimate land surface temperature (Ts) in spectral band as the infrared channel (IR) of METEOSAT-7. This algorithm permits us to join by a relationship of second order the surface temperature to the brightness temperature (Tb) at the sensor level. This algorithm is obtained starting from the radiative transfer equation and requires the knowledge of atmospheric transmittance (t), the surface emissivity (e) and the effective mean atmospheric temperature (Ta). The results obtained were validated by using the LOWTRAN-7 radiative transfer code. For a values of atmospheric water content (W)  lower or equal to 3.1 g/cm2 and for values of emissivity equal or higher than 0.98, we  had  found that the maximum difference between the land surface temperature estimated and simulated by LOWTRAN-7 does not exceed 2°C.</p

Product Lifecycle Management Strategy for the Definition and Design Process of Face Implants Oriented to Specific Patients

Part 2: Collaborative Environments and New Product DevelopmentInternational audienceThe main purpose of this research was oriented to generate a structured model from an organizational vision to the definition and development of precise osteosynthesis prosthesis. Implants were adapted to the Colombian population anthropometry allowing fracture reductions and craniofacial defects corrections based on technologies for specific patients. This research was developed taking into account the first three PLM stages: Imagination, definition, and realization. Procedures, stages, roles, and activities that take part in the design and pre-surgical planning were identified for the patient-specific implants PSI, carried out through a study case. It was established as a definition model for design and fabrication process of patient-specific implants (PSI). It was possible that technology included in a collaborative workflow wherein the roles which intervene in the design process and the pre-surgical planning were related. The ability to design implants for specific patients and surgical guides was obtained different pathology situations including face trauma. According to the PLM strategy for designing custom implant, it would be possible to build innovation capabilities. With those, an organization could generate a collaborative workflow integrating stages, roles, activities, applying technology and local human resource. Further work related to the subject is necessary to enhance the process by iteration and improve the clinical cases management