Browsing Productos de investigación by Title
Now showing items 687-706 of 798
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Speckle free optical watermarking based on pseudo-random phase encoding
(Institute of Electrical and Electronics Engineers Inc., 2016)Watermarking is a process of embedding copiright information into an image to verify the ownership without any kind of corruption. In optical applications, the usage of diffusers is required to obtain a homogeneously ... -
Speckle reduction in echocardiography by temporal compounding and anisotropic diffusion filtering
(SPIE, 2015)Echocardiography is a medical imaging technique based on ultrasound signals that is used to evaluate heart anatomy and physiology. Echocardiographic images are affected by speckle, a type of multiplicative noise that ... -
SPUD: Simultaneous phase unwrapping and denoising algorithm for phase imaging
(Cartagena de Indias, 2020-05-01)Recent methods for phase unwrapping in the presence of noise include denoising algorithms to filter out noise as a preprocessing stage. However, including a denoising stage increases the overall computational complexity ... -
Stability Analysis of Single-Phase Low-Voltage AC Microgrids with Constant Power Terminals
(Institute of Electrical and Electronics Engineers Inc., 2019)This express brief presents the stability analysis of single-phase microgrids (SP-MG) operating under master-slave connection with constant power terminals. The SP-MG is composed of linear elements, nonlinear loads, and ... -
Stabilization of MT-HVDC grids via passivity-based control and convex optimization
(Cartagena de Indias, 2021-04-30)This paper presents a model for stabilizing multi-terminal high voltage direct-current (MT-HVDC) networks with constant power terminals (CPTs) interfaced with power electronic converters. A hierarchical structure of ... -
Standard passivity-based control for multi-hydro-turbine governing systems with surge tank
(Elsevier Inc., 2020)This paper addresses the problem of control design for hydro-turbine governing systems with surge tanks from the perspective of standard passivity-based control. The dynamic model of a synchronous machine is considered in ... -
State-of-the-art active optical techniques for three-dimensional surface metrology: a review [Invited]
(Campus TecnológicoIngeniería Mecatrónica, 2020)This paper reviews recent developments of non-contact three-dimensional (3D) surface metrology using an active structured optical probe. We focus primarily on those active non-contact 3D surface measurement techniques that ... -
State-of-the-art green roofs: Technical performance and certifications for sustainable construction
(Cartagena de Indias, 2020-01-13)Green roof systems, a technology which was used in major ancient buildings, are currently becoming an interesting strategy to reduce the negative impact of traditional urban development caused by ground impermeabilization. ... -
Static secure page allocation for light-weight dynamic information flow tracking
(2012)Dynamic information flow tracking (DIFT) is an effective security countermeasure for both low-level memory corruptions and high-level semantic attacks. However, many software approaches suffer large performance degradation, ... -
Stationary axially symmetric relativistic thin discs with nonzero radial pressure
(2012)A detailed analysis of the surface energymomentum (SEMT) tensor of stationary axially symmetric relativistic thin discs with nonzero radial pressure is presented. The physical content of the SEMT is analysed and expressions ... -
Steric and chain length effects in the (√(3) × √(3))R30° structures of alkanethiol self-assembled monolayers on Au(111)
(Wiley-VCH Verlag, 2011)The translational and orientational potential energy surfaces (PESs) of n-alkanethiols with up to four carbon atoms are studied for (√(3) × √(3))R30° self-assembled monolayers (SAMs). The PESs indicate that methanethiol ... -
Strategic direction: Projection of technological innovation and administrative management in small enterprises
(Centro de Informacion Tecnologica, 2017)The main objective of this research is to establish the level of innovation in technology and strategic direction of small and medium size enterprises (SMEs) in the city of Barranquilla, Colombia. For this purpose, a ... -
Strategies for the improvement of research competences in the professional training of engineers
(Cartagena de Indias, 2021-11-01)The objective of this study is proposing strategies to strengthen research competencies needed by engineers in training. An analytical, situation research was conducted in four Engineering programs from a public university ... -
Study of early P91 dual corrosion in steam and simulated combustion gases from a gas-fired boile
(Cartagena de Indias, 2021-07-25)P91 ferritic steel pipes face dual environments during boilers operation: steam-side and fire-side. This P91 steel assessment differs from the dual studies performed to simulate coal-fired boilers -oxyfuel/steam atmospheres- ... -
Study of the lower limp's angle during weightlifting exercises using an accelerometer-based system
(Institute of Electrical and Electronics Engineers Inc., 2014)This article describes the implementation and use of a two-accelerometer system to measure the angle formed between lower joints of weightlifters during the execution of the technical gesture. Being aware of movement between ... -
Study on high throughput nanomanufacturing of photopatternable nanofibers using tube nozzle electrospinning with multi-tubes and multi-nozzles
(Society of Micro and Nano Systems, 2017)High throughput nanomanufacturing of photopatternable nanofibers and subsequent photopatterning is reported. For the production of high density nanofibers, the tube nozzle electrospinning (TNE) process has been used, where ... -
Subatmospheric pressure in a water draining pipeline with an air pocket
(Taylor and Francis Ltd., 2018)An air pocket’s behaviour inside of a pipeline during transient conditions is of great importance due to its effect on the safety of the hydraulic system and the complexity of modeling its behaviour. The emptying process ... -
Substituted heterocycles as new candidates for liquid organic hydrogen carriers: In silico design from DFT calculations
(Cartagena de Indias, 2021-02-24)A new set of compounds based on N- and S-heterocycles were investigated through Density Functional Theory (DFT) for their use as liquid organic hydrogen carriers (LOHCs). The hydrogenated forms of these compounds could ... -
Supplier selection service-case study UTB
(2012)Supplier selection supported by methods based on computational tools are fundamental enterprise actions. This paper proposes the development of supplier selection model supported on a computational tool, using the purchasing ... -
Sustainable boat transportation throughout electrification of propulsion systems: Challenges and opportunities
(Institute of Electrical and Electronics Engineers Inc., 2019)Global use of carbon-based fuels increased by 1.6 % in 2017 and continued increasing in 2018, after managing to maintain emissions flat between 2014-2017. This trend deviates from the emissions trajectory required to fulfill ...
