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Fractional Fourier analysis of random signals and the notion of α -Stationarity of the Wigner-Ville distribution
(2013)
In this paper, a generalized notion of wide-sense α-stationarity for random signals is presented. The notion of stationarity is fundamental in the Fourier analysis of random signals. For this purpose, a definition of the ...
International technology adoption, R&D, and productivity growth
(Walter de Gruyter GmbH, 2013)
International knowledge diffusion is considered an important source of productivity growth. However, direct observations on such diffusion have not been available at the macro level. We analyze novel data on international ...
Capital Budgeting and Inflation
(John Wiley and Sons, 2013)
Trends and Perspectives of Sustainable Product Design for Open Architecture Products: Facing the Circular Economy Model
(Korean Society for Precision Engineering, 2019)
The purpose of this paper is to perform the analysis of literature review regarding the design of open architecture products (OAP) and their potential benefits within the circular economy (CE) model. The analysis involved ...
LRemoving Dust Artifacts in Retinal Images via Dictionary Learning and Sparse-Based Inpainting
(Institute of Electrical and Electronics Engineers Inc., 2019)
In the field of ophthalmology, retinal images are essential for the diagnosis of many diseases. These images are acquired with a device called the retinal camera. However, often small dust particles in the sensor produce ...
Validation of instruments as a guarantee of credibility in scientific research
(Editorial Ciencias Medicas, 2019)
Instrument validation is considered, for the scope of its scientific rigor, a type of study with its characteristics and procedures. The purpose of this work is to propose a methodology for the validation of a scientific ...
Restoration of retinal images with space-variant blur
(2014)
Retinal images are essential clinical resources for the diagnosis of retinopathy and many other ocular diseases. Because of improper acquisition conditions or inherent optical aberrations in the eye, the images are often ...
Direct power control for VSC-HVDC systems: An application of the global tracking passivity-based PI approach
(Elsevier Ltd, 2019)
This paper proposes a direct power control (DPC) for a high-voltage direct-current system using voltage source converters (VSC-HVDC) by applying passivity-based control theory. This system allows doing an efficient and ...
Programmable diffractive lens for ophthalmic application
(SPIE, 2014)
Pixelated liquid crystal displays have been widely used as spatial light modulators to implement programmable diffractive optical elements, particularly diffractive lenses. Many different applications of such components ...
Virtual lab in Modelica of a cement clinker cooler for operator training
(2014)
Plant operator training plays a fundamental role in improving the energy efficiency of the cement manufacturing process and in reducing the CO2 emission. A virtual lab of a clinker grate cooler, intended for the training ...
Universidad Tecnológica de Bolívar - 2017 Institución de Educación Superior sujeta a inspección y vigilancia por el Ministerio de Educación Nacional. Resolución No 961 del 26 de octubre de 1970 a través de la cual la Gobernación de Bolívar otorga la Personería Jurídica a la Universidad Tecnológica de Bolívar.