Constructive function approximation: theory and practice

In this paper we study the theoretical limits of finite constructive convex approximations of a given function in a Hilbert space using elements taken from a reduced subset. We also investigate the trade-off between the global error and the partial error during the iterations of the solution. These results are then specialized to constructive function approximation using sigmoidal neural networks. The emphasis then shifts to the implementation issues associated with the problem of achieving given approximation errors when using a finite number of nodes and a finite data set for training

New extreme-point robust stability results for discrete-time polynomials

This paper provides some new extreme-point robust-stability results for discrete-time polynomials with special uncertainties in the coefficient space. The proofs, obtained using the barycentric coordinates, are simple and the results specialize to existing robust-stability results

Bounding the frequency response for digital transfer functions: results and applications

This paper introduces robust stability techniques for the computation of exact bounds for the frequency response of FIR and IIR digital filters in which the l∞ norm of the coefficients is bounded

Output Stabilizability

In this report, we provide algebraic tests to determine whether a linear Single-Input-Single-Output (SISO) system, is stabilizable with a constant output feedback

Neural networks in fault detection: a case study

We study the applications of neural nets in the area of fault detection in real vibrational data. The study is one of the first to include a large set of real vibrational data and to illustrate the potential as well as the limitations of neural networks for fault detection

Feasibility analysis of channel equalizers using Kharitonov-type results

Necessary and sufficient conditions for determining the robust location of the roots of a family of polynomials are presented. This family appears when multipath fading channels are considered due to the uncertainty in the channel impulse response. The uncertainty is reflected by means of confidence intervals for the channel parameters. A feasibility analysis of digital equalizers is performed in the frequency domain to determine whether the poles are to be found in a prespecified region of the complex plane. The resulting tests, which can be carried out in a graphical manner, are both analysis and design tools, which can help to decide the suitable length of a constrained equalizer. The analysis method presented resolves the location of the poles on a zero-forcing equalizer structure

El Virus del mosaico común del poroto (BCMV), raza tipo, patógeno limitante para algunos cultivares en Cruz del Eje (Cba.)

Bean Common Mosaic Virus (BCM V ), Type strain, was identified according to host range (only Phaseolus sp, L was infected); simptoms; dilution end point (DEP) 1O - 10-4; termal inactivation point (T.I.P.) 55-604C; viri6n normal length 747 nm. Seed trasmition was estimated in 86%, and Myzus persi. cae Sulz trasmited the virus in a non persistent way. On epidermal strips amorphous inclusion were observed. Host range, TIP, DEP, and seed transmitiou were considered for race determination. The disease had tremendous importance. During 1975 and 1976 was cause of the loss of 55 and 35 has. respectivily of the c.v. Bolita Cristad in the samo field. During 1976 and 1977 loss was estimated in 12% and 18% respect.vily with thL, c.v. Bolita Común.Se identifica al mosaico común del poroto (CBMV), raza Tipo en base a rango de hospedantes (solo infecta a c.v, de Phaseolus sp.); síntomas; a que su P.D.F. se determinó entre 10-3 y 10-4; el P.I.T. entre 55-609C y el largo normal del virión en 747 nm; a que lo trasmitió Myzus persicae Sulz, en forma no persistente; que su trasmisión por semilla resultó del 86% y que se observaron inclusiones amorfas en epidermis. La raza se determinó en base a hospedantes diferenciales teniéndose en cuenta además el P.D.F.; P.I.T. y el porcentaje de trasmisión por semilla de las distintas razas. La enfermedad motivó el abandono de 55 has., del c.v. Bolita Cristal en 1975 y 35 has. durante 1976 en el mismo predio. En Bolita Común produjo la pérdida de 12% de las plantas en 1976 y el 18% e n 1977. Otros cultivares tipo Jamapa se comportaron como tolerantes

VCAN (versican)

Review on VCAN (versican), with data on DNA, on the protein encoded, and where the gene is implicated

Few-mode metal-free perovskite optical fiber with second-order optical nonlinearity

Semiconductor core optical fibers are highly desirable for fiber-based photonic and optoelectronic applications as they can combine strong optical nonlinearities, tight light confinement, wide transmission bands, and electronic functionality within a single platform. Perovskites have emerged as particularly exciting materials for semiconductor photonics as they have strong optical nonlinearities and tunable optoelectronic bandgaps. However, lead-based perovskites contain toxic elements and are, therefore, not environmentally friendly. Furthermore, in fiber form, their core-size is prohibitively large, making them unsuitable for nonlinear optics and applications that require single-mode guidance, such as telecommunications. Here, we report a metal-free perovskite core optical fiber where lead has been substituted for an ammonium cation in the perovskite structure. The core material has a wide bandgap greater than 5 eV, a high laser damage threshold, and a core diameter that can be produced as small as 5 \ub5m. At this core size, the fiber supports just six modes, and the fundamental mode can readily be excited and isolated. Moreover, the metal-free perovskite has a second-order susceptibility that is absent in the archetypal lead-based perovskites and many other semiconductor core materials, such as silicon and germanium. The second-order susceptibility is important for many nonlinear optics applications, such as second-harmonic generation and quantum optics

Detección de cambios en los usos de suelo a partir de clasificaciones no supervisadas para la actualización del SIOSE. Implementación en el territorio gallego

Revista oficial de la Asociación Española de Teledetección[EN] One of the basic elements when designing policy analysis, management and land use planning is a good land use mapping. For this purpose, there is the Corine Land Cover (CLC) at European level and SIOSE (Occupation Information System Soil Spain) nationwide. Processes updating of this cartography are often costly, and this is where the techniques of remote sensing of the Earth can be of great help. This work is to obtain, through a multi-temporal analysis between SPOT 5 images of 2009 and 2011, an effective method of detecting changes in a heterogeneous level of coverage as the Galician field. To achieve the identification of areas where there has been modification of land uses, new channels that collect differences (radiometric and structural) from SPOT images for both years are generated. Then, several classifications are made in these channels obtaining a layer changes. This layer changes supported with images PNOA (National Aviation Plan Orthophotography) is a reliable and useful information for a directed photointerpretation in SIOSE update, thereby reducing the execution time and maintaining the quality of the final database.[ES] Uno de los elementos básicos a la hora de diseñar políticas de análisis, gestión y planificación del territorio es una buena cartografía de usos de suelo. Para este cometido, se dispone del Corine Land Cover(CLC) a nivel europeo y del SIOSE (Sistema de Información sobre Ocupación del Suelo de España) a nivel nacional. Los procesos de actuali-zación de esta cartografía suelen ser costosos, y es aquí donde las técnicas de observación remota de la Tierra pueden servir de gran ayuda. En este trabajo se pretende obtener, mediante un análisis multitemporal entre las imágenes Spot 5 de los años 2009 y 2011, un método de detección de cambios efectivo en un terreno tan heterogéneo a nivel de coberturas como el gallego. Para conseguir la identificación de las zonas donde se ha producidomodificación de los usos de suelo se generan nuevos canales que recogen diferencias (radiométricas y estructurales) entre las imágenes Spot de ambos años, y luego se realizan sobre ellos varias clasificaciones para obtener una capa de cambios. La capa de cambios obtenida identifica las zonas en donde ha habido variación y, complementada con imágenes PNOA (Plan Nacional de Ortofotografía Aérea), constituye una información fiable útil para realizar una fotointerpretación dirigida en la actualización del proyecto SIOSE, reduciendo así los tiempos de ejecución y manteniendo la calidad de la base de datos final.Queremos agradecer al IGN por las imágenes facilitadas para la realización del presente trabajo así como la colaboración de Mª Elena Caballero García e Irene Rosa Carpintero del IGN, y Dominique Aller González del SITGA.Vila-García, D.; Gil-Docampo, M.; Iniesto-Alba, M. (2015). 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Land Use Policy, 24(1), 234-247. doi:10.1016/j.landusepol.2006.02.002Fuller, R., Groom, G., Jones, A. R. 1994. The land cover map of Great Britain: an automated classification of Landsat Thematic Mapper data. Photogrammetric Engineering and Remote Sensing, 60(5): 553-562.Goerlich, F. J., Cantarino, I. 2011. Downscaling Population with a High Resolution Land Cover Data Set for Spain. En: European Forum for GeostatisticsConference (EFGS). Lisboa, Portugal, 12-14 octubre.González-Audicana, M. 2008. Fusión de imágenes SPOT 5 empleando el método de bajo coste computacional FAST-SRF. En: II Jornadas de Fusión de Imágenes de Satélite. Pamplona (Navarra), Espa-a, 16-17 junio.Peces, J., Tejeiro, J., Plaza, N., Villa, G., Domenech, E. 2009. Tratamientos y aplicaciones del Plan Nacional de Teledetección. En: Montesinos S., Fernández L., (Eds.), Teledetección: agua y desarrollo sostenible. XIII Congreso de la Asociación Espa-ola de Teledetección. Calatayud (Zaragoza), Espa-a, 23-26 septiembre, pp 512-520.Pérez, C., Sánchez, N. 2005. Experiencias en la corrección geométrica de imágenes de alta resolución: metodología rigurosa versus empírica. En: XI Congreso Nacional de Teledetección. Puerto de la Cruz (Tenerife), Espa-a, 21-23 septiembre.Romero, D., Gil, Y., Ortega, E., Domínguez, M. C., Navas, P., Pati-o, M., Vicent, C., Santos, M., Quijada, J., Giménez de Azcárate, F., Cáceres, F., Moreira, J. M. 2010. Actualización SIOSE en Andalucía 2009. En: Ojeda, J., Pita, M.F. y Vallejo, I. (Eds.), Tecnologías de la Información Geográfica: La Información Geográfica al servicio de los ciudadanos. Secretariado de Publicaciones de la Universidad de Sevilla. Sevilla. pp. 348-361. ISBN:978-84-472-1294-1.Tou, J. T., González, R. C. 1974. Pattern Recognition Principles. Addison-Wesley Publishing Company, Reading, Massachusetts.Valencia, G., Anaya, J. 2009. Implementación de la metodología Corine Land Cover con imágenes Ikonos. Revista Ingenierías Universidad de Medellín, 8(15): 39-52.Zhang, Y. 2002. A New Automatic Approach for effectively fusing Landsat 7 images and IKONOS images. En: Geoscience and Remote Sensing Symposium, 4. Toronto, Canada, 24-28 junio. pp. 2429-2431