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https://purl.org/pe-repo/ocde/ford#5.02.04
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https://purl.org/pe-repo/ocde/ford#2.11.04
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https://purl.org/pe-repo/ocde/ford#5.03.01
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https://purl.org/pe-repo/ocde/ford#2.01.01
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Rendimiento académico
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https://purl.org/pe-repo/ocde/ford#2.00.00
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https://purl.org/pe-repo/ocde/ford#5.05.00
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ford methods » four methods (Expander búsqueda), folch methods (Expander búsqueda), order methods (Expander búsqueda)
new ford » new food (Expander búsqueda), new forms (Expander búsqueda), new cold (Expander búsqueda)
ford methods » four methods (Expander búsqueda), folch methods (Expander búsqueda), order methods (Expander búsqueda)
new ford » new food (Expander búsqueda), new forms (Expander búsqueda), new cold (Expander búsqueda)
1
artículo
Morris water maze (MWM) test is widely used to evaluate the learning and memory deficits in rodents. Image processing and pattern recognition can be used to analyse videos and recognize automatically the tracking in MWM. There are several commercial and free access software that allows analyzing the behavioral tasks although they also have limitations such as automation, cost, user intervention among other things. The aim of this paper was to develop a new image processing technique to automatically analyse the track of the rat in the MWM, which we called RatsTrack. The MWM test was performed with an animal model for Alzheimer, and the videos were recorded to measure the distance, time, and speed. The segmentation method based on the projection of the video frames was made for pool identification, eliminating the rat, while conserving the shape of the pool. Then, the Hough transformation...
2
artículo
Publicado 2022
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The EduBPMN method contains a set of transformation rules that allow the generation of Graphical User Interfaces (GUIs) from a BPMN model complemented by the UML class diagram. The article proposes new rules for the EduBPMN method based on BPMN primitives and operations of the UML classes. These rules can generate design alternatives for GUIs, each of which has been proposed to be represented by a stereotype. As a result of this work, four new rules and eight new stereotypes have been proposed to extend the EduBPMN method. For a better understanding of the contribution, it has been applied to an illustrative example of a project.
3
artículo
Publicado 2021
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We describe a simple method for the preparation of gold-decorated silica (SiO2) nanoparticles (NPs) by the in situ precipitation method using simple BH4? ions reduction as a procedure, where BH4? ions are adsorbed onto PEI-functionalized SiO2 NPs for stabilizing and reducing gold ions onto PEI-SiO2 surface in water under ambient conditions. The result was 3-nm gold nanoshell NPs attached to SiO2 core (~ 75 nm) with a surface plasmon resonance (SPR) at ~ 680 nm. SPR band is associated with Au NP aggregates that arise from strong interparticle interaction. This is an alternative to the gold-seeding methods and the use of anionic gold species for the obtention of gold-decorated SiO2 NPs with an important red-shift in UV–Vis absorption and with potential applications in biosensors and photothermal therapy.
4
objeto de conferencia
Publicado 2022
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The heart of the grid is the power transformer and it is associated to all the electrical chain for distribution, transmission and generation field. Usually the evaluation of the remaining life and condition is based on Furan analysis or dissolved gas analysis (DGA); however, both requires oil samples; in a zero downtime policy, the continuous evaluation requires an additional equipment as online DGA equipment. Due to this limitation, the alternative is the evaluation of the “hot-spot temperature” (HST) in the transformers, with the sensors available in the oil, and winding; but an online evaluation has not been considered in the international standards as IEC 60076-7. So, this paper develops the mathematical model, algorithms and evaluates in a real case study, an optional method to obtain the HST and its impacts in the remaining life. This methodology is applied to three phase tran...
5
artículo
Publicado 2023
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Ocean waves contain the highest energy density among renewable energy sources. However, harnessing the energy from ocean waves represents a challenge because wave energy converters (WECs) must be designed to have great survivability and efficiency. The power production challenge of any WEC depends on the power take-off (PTO) system efficiency. Maximum power point tracking (MPPT) algorithms have been widely applied in renewable energy from photovoltaic and wind sources, and have subsequently been adapted to wave energy converters (WECs). Energy extraction is optimized by applying MPPT, resulting in an increase in efficiency. This study aims to address the analysis of the influence of the perturb and observe MPPT in the electrical power performance of a WEC composed of a point absorber, a hinged arm and a direct mechanical drive PTO system. The PTO is characterized by a pulley system, a co...
6
artículo
Publicado 2019
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Background: Drones are reliable tools for estimating colonial seabird numbers. Although most research has focused on methods of improving the accuracy of bird counts, few studies have evaluated the impacts of these methods on bird behavior. In this study, we examined the effects of the DJI Phantom 3 drone approach (altitude, horizontal and vertical descent speeds) on changes in the intensity of behavioral response of guano birds: guanay cormorants (Phalacrocorax bougainvilli), Peruvian boobies (Sula variegata) and Peruvian pelicans (Pelecanus thagus). The breeding and non-breeding condition was also evaluated. Methods: Eleven locations along the Peruvian coast were visited in 2016-2017. Drone flight tests considered an altitude range from 5 to 80 m from the colony level, a horizontal speed range from 0.5 to 15 m/s, and a vertical descent speed range from 0.5 to 3 m/s. The intensity of th...
7
artículo
Publicado 2019
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The performance of discrete element method (DEM) simulations is highly dependent on the requirements of the associated algorithms in terms of computer memory usage and CPU time. In particular, computer CPU time heavily depends on the identification of neighbor particles and the computation of particle-particle interactions. Over the years several neighbor particles searching methods have been developed. Accordingly, in this work the performance of two of well-known searching methods, linked cell and Verlet tables algorithms, are assessed in the context of the development of a new DEM-based tool. More specifically, the neighbor searching methods performance and related computational costs are parametrically analyzed and an assessment of their suitability for carrying the intended numerical simulations is provided. The referred numerical simulations are performed accounting for a canonical...
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9
artículo
Publicado 2016
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The authors gratefully acknowledge the Consejo Nacional de Ciencia, Tecnología e Innovación Tecnológica (CONCYTEC/CIENCIACTIVA-Peru, Process number 219-2014/247-2015), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq-Brazil, process number 449609/2014-6) and the National Research Foundation of Korea (2012M1A2A2026587) funded by the Korea government Ministry of Education, Science and Technology for financial support.
10
artículo
This article summarizes our investigation about technologies for moisture sensing, a parameter of analysis and study over many years because it serves to estimate the quality, and performance at commercial and environmental level. This paper presents some contributions. First, we developed a new classification about the most representative system in research and scientific articles. We shows applications of the technology in recent years according to the consulted articles. Also, we expose systems for soil and vegetation moisture measurement, this is an important application in this decade because helps to agriculture and many control applications (forestall fires, earthquakes, etc.). Finally, the tendency about new investigations is presented. This paper is important for microwave sensors designers and investigators in moisture control, because they will have a reference about what kind...
11
documento de trabajo
Publicado 2020
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La inversión en exploración minera es el principal impulsor de la producción minera a futuro. Sin inversión en exploración, no es posible sostener la producción de metales a largo plazo. Los países con mayor competitividad minera tenderán a atraer cantidades mayores de inversiones en exploración. Según el enfoque "tradicional" de la competitividad minera, el potencial geológico de un país es un determinante crucial de su competitividad. Esta proposición implica que el potencial geológico sería el principal impulsor de la asignación de inversiones en exploración en todo el mundo. En los últimos años, ha surgido una visión "alternativa" de la competitividad minera. Según esta hipótesis, el clima de inversión de un país es el principal determinante de su competitividad. Sin embargo, las pruebas empíricas que respaldan la validez de esta visión "alternativa" siguen ...
12
artículo
“ In these times of pandemic caused by Covid-19, new ways of dealing with the effects of the virus emerge, for this reason multiple measures are being carried out with the intention of mitigating its effects in the event of a possible contagion, which is why vaccinations are being carried out massive in order to be able to defend oneself against potential contagions, in this work an application made using the NFC communication protocol that mobile devices have is shown, as a result the demonstration of the use of the application is presented, where it reflects the data to be entered and can be viewed from any device“
13
artículo
Conferencia de la 8th Eighth International Virtual Conference on Biosignals, Images, and Instrumentation (ICBSII).
14
documento de trabajo
Publicado 2013
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Perron y Wada (2009) proponen un nuevo método de descomposición del PIB en sus componentes de tendencia y ciclo, que supere los problemas de identificación de los modelos de componentes no observables y modelos ARIMA y, al mismo tiempo, admite no linealidades y asimetrías en el ciclo. El método asume que la producción puede ser representado por un modelo no lineal de componentes no observados, donde las perturbaciones consisten en una mezcla de distribuciones normales. En este documento, se aplica este algoritmo al PIB peruano con datos trimestrales desde 1980 hasta 2011. Como resultado de este análisis, se elige el modelo UC-CN, que presenta una mezcla de las normales en las perturbaciones de la tendencia y el componente de ciclo de la producción. La tendencia obtenida refleja claramente el cambio estructural experimentado a principios de 1990. Después de una fuerte disminu ci...
15
artículo
This study is devoted to reviewing and analyzing current trends in engineering research methods, concentratingon modeling and simulation, machine learning, artificial intelligence, and complex systems engineering. Selected and analyzed academic articles published within the last five years were used to create a critical analysis. Despite the associated challenges, such as the need for new competencies and resources, the results indicated that these emergent methods significantly impact the engineering field. However, significant voids were also identified, including the inability to solve engineering problems innovatively and efficiently. This study concludes by emphasizing the need for additional in-depth research into these trends and their effects on various engineering disciplines.
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tesis de maestría
The objective of the present study is to demonstrate wheter lead user method is more useful than traditional market research method as a source of innovation for e- businesses. Also, to prepared a contribution about the use of lead user method as a source of innovation in e-business, adding new facts and implications that help to improve the actual knowledge about the topic in order to encourage the best practice in the field. Making an interpretative approach in study field, I could find some answers to my research question. Firstly, main characteristics firms expect a new market research method have in order to apply it for their market researches are the use by recommendation and faster in results. Secondly, the choosing of a market research method, must to generate value through the use of KPI´s and reflected in one of the five dimensions of e-commerce value grid. Finally, even Scho...
17
artículo
Publicado 2020
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The coexistence allows the adaptation of the aggressors and assaulted in school communities through artistic interaction techniques. Due to its transformational value, artivist education allows students to be involved in raising awareness of their environment as well as themselves. For this reason, the interest of the research was to determine the benefits of artivism in school coexistence. Three studies based on sustainability, school exchange and meaning analysis were carried out in 80 fifth and sixth grade primary students. Measurement scales and the log of experiences were used, from whose data it was obtained that there was greater sustainability of direct and democratic coexistence from the fourth month of experimentation with activities based on artivist education (Experiment 1), as well as effects on school exchange with greater emphasis on the democratic component (Experiment 2)...
18
tesis de maestría
The minimum variance (MV) beamformer is an adaptive beamforming method that has the potential to enhance the resolution and contrast of ultrasound images. Although the sensitivity of the MV beamformer to steering vector errors and array calibration errors is well-documented in other fields, in ultrasound it has been tested only under gross sound speed errors. Several robust MV beamformers have been proposed, but have mainly reported robustness only in the presence of sound speed mismatches. Additionally the impact of PAC methods in mitigating the effects of phase aberration in MV beamformed images has not been observed Accordingly, this thesis report consists on two parts. On the first part, a more complete analysis of the effects of different types of aberrators on conventional MV beamforming and on a robust MV beamformer from the literature (Eigenspace-based Minimum Variance (ESMV) bea...
19
tesis de maestría
The minimum variance (MV) beamformer is an adaptive beamforming method that has the potential to enhance the resolution and contrast of ultrasound images. Although the sensitivity of the MV beamformer to steering vector errors and array calibration errors is well-documented in other fields, in ultrasound it has been tested only under gross sound speed errors. Several robust MV beamformers have been proposed, but have mainly reported robustness only in the presence of sound speed mismatches. Additionally the impact of PAC methods in mitigating the effects of phase aberration in MV beamformed images has not been observed Accordingly, this thesis report consists on two parts. On the first part, a more complete analysis of the effects of different types of aberrators on conventional MV beamforming and on a robust MV beamformer from the literature (Eigenspace-based Minimum Variance (ESMV) bea...
20
artículo
Purpose: This paper aims to present a literature review of the most recent optimisation methods applied to Credit Scoring Models (CSMs). Design/methodology/approach: The research methodology employed technical procedures based on bibliographic and exploratory analyses. A traditional investigation was carried out using the Scopus, ScienceDirect and Web of Science databases. The papers selection and classification took place in three steps considering only studies in English language and published in electronic journals (from 2008 to 2022). The investigation led up to the selection of 46 publications (10 presenting literature reviews and 36 proposing CSMs). Findings: The findings showed that CSMs are usually formulated using Financial Analysis, Machine Learning, Statistical Techniques, Operational Research and Data Mining Algorithms. The main databases used by the researchers were banks an...
