AGDB. Nuevas Tecnologías - UDES

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  • Publicación
    Acceso abierto
    Application of the calculus of variations to the vertical cut off in cohesive frictionless soil
    (1981-05-02) Castillo, E.; Luceiio, A.; De Joesselin De Jong, G.
  • Publicación
    Acceso abierto
    Simulación bidimensional del flujo de convección libre en una cavidad cuadrada utilizando el método de la ecuación de Boltzmann en redes
    (2011-07) Flórez Serrano, Elkin; Laguado Ramírez, Raquel
    La convección es un fenómeno fundamental encontrado en varias aplicaciones atmosféricas e industriales. En el presente artículo se presenta la simulación numérica del flujo en una cavidad, calentada en una de sus paredes, en régimen laminar, números de Rayleigh (Ra) de 103 ≤ Ra ≤106 y para un número de Prandtl de Pr = 0,7, mediante el método de la ecuación de Boltzmann en redes (LBE). Esta técnica ha demostrado ser muy eficiente y poderosa en la dinámica de fluidos computacional (CFD). La velocidad del flujo se calcula a partir del uso de la tradicional función densidad de distribución en el modelo D2Q9 (de dos dimensiones y nueve velocidades) y la temperatura se obtiene a partir de la inclusión de una función de densidad de distribución de energía interna en un modelo D2T5 (dos dimensiones y cinco temperaturas). El nuevo modelo térmico utilizado demostró ser estable y los resultados obtenidos demuestran una gran exactitud al ser comparados con los resultados obtenidos experimental y numéricamente, mediante otros métodos de CFD.
  • Publicación
    Acceso abierto
    A necklace sonar with adjustable scope range for assisting the visually impaired
    (2013) Villamizar, Luz H.; Gualdrón, Mauricio; González, Fabio; Aceros, Juan; Rizzo Sierra, Carlos V.
    A sonar based device with tactile feedback was developed to improve the mobility and independence of visually impaired individuals. It features a transceiver/receiver, a potentiometer, a microcontroller, a rechargeable polymer lithium ion battery, and a Nokia Cell phone vibrator. All components are commercially available and housed in a custom acrylic package with 86 mm × 34 mm × 12 mm in dimension, and 120 grms in weight. Additionally, the device features an adjustable detection scheme for user customization of distance range, and a tactile feedback system that avoids interference with auditory sensory information. The device was tested for its navigational efficacy in an artificial indoor environment, and in a live outdoor setting. Ten subjects (9 males and 1 female), with a mean age of 35 years-old (range: 17 to 52) were presented with a series of navigational tasks resulting in considerable reduction of head, shoulder, chest, and arms collisions during their locomotion. We conclude that this device greatly improves the mobility and safety of visually impaired individuals.
  • Publicación
    Acceso abierto
    Perfil de responsabilidad social empresarial para las entidades promotoras de salud - régimen contributivo de Bucaramanga y su área metropolitana
    (2014-01) Morales Méndez, Jonathan David; Galeano Barrera, Claudia Jazmín; Muñoz Ospina, José Fernando
    Introducción: Este proyecto busca determinar el perfil y el análisis de las prácticas actuales de responsabilidad social empresarial en las entidades promotoras de servicios de salud de Bucaramanga y su área metropolitana, a partir del análisis cualitativo y cuantitativo de variables, estableciendo como estas entidades promueven el desarrollo integral de la salud. Materiales y Métodos: El estudio contempló un enfoque cuantitativo de tipo analítico, en el cual se realizó un censo en el cual participaron 11 Entidades Promotoras de Salud (EPS) en cada una de ellas se midieron un total de 72 variables, a partir de ello se formula una metodología cualitativa para medir el nivel de gestión en Responsabilidad Social Empresarial (RSE) también una valoración cuantitativa mediante un análisis multivariado con el programa Numerical Taxonomy System (NTSYS) que permitiera determinar perfiles en Responsabilidad Social Empresarial. Resultados y Discusión: A partir de los resultados se pudo observar cómo se encontraban las empresas del sector respecto a Responsabilidad Social Empresarial, así como identificar el nivel de gestión que cuentan las EPS en el tema de Responsabilidad Social Empresarial, adicional a esto se determinó que no existe un Perfil dominante en el Sector en materia de Responsabilidad Social Empresarial. Conclusiones: Se ha establecido que las Entidades Promotoras de Salud, tienen un modelo de responsabilidad social reactivo, cada una lleva a cabo diversas acciones las entidades que no son suficientes para consolidar una estrategia del sector para el desarrollo de un modelo integral de saludque contribuyen a la dimensión social del desarrollo sostenible.
  • Publicación
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    The goal of blood pressure in the hypertensive patient with diabetes is defined : Now the challenge is go from recommendations to practice
    (2014-03-04) Lopez-Jaramillo, Patricio; López López, Jose; López López, Cristina; Rodríguez Alvarez, Miguel I
    The recent Latin American and European guidelines published this year has proposed as a goal for blood pressure control in patients with diabetes type 2 a value similar or inferior to 140/90 mmHg. High blood pressure is the leading cause of cardiovascular diseases and deaths globally. Although once hypertension is detected, 80% of individuals are on a pharmacologic therapy only a minority is controlled. Diabetes also is a risk factor for other serious chronic diseases, including cardiovascular disease. Whether specifically targeting lower fasting glucose levels can reduce cardiovascular outcomes remains unknown. Hypertension is present in 20% to 60% of patients with type 2 diabetes, depending on age, ethnicity, obesity, and the presence of micro or macro albuminuria. High blood pressure substantially increases the risk of both macro and micro vascular complications, doubling the risk of all-cause mortality and stroke, tripling the risk of coronary heart disease and significantly hastening the progression of diabetic nephropathy, retinopathy, and neuropathy. Thus, blood pressure lowering is a major priority in preventing cardiovascular and renal events in patients with diabetes and hypertension. During many years the BP goals recommended in patients with diabetes were more aggressive than in patients without diabetes. As reviewed in this article many clinical trials have demonstrated not only the lack of benefits of lowering the BP below 130/80 mmHg, but also the J-shaped relationship in DM patients. Overall we discuss the importance of define the group of patients in whom significant BP reduction could be particularly dangerous and, on the other hand, those with a high risk of stroke who could benefit most from an intensive hypotensive therapy. In any case, the big challenge now is avoid the therapeutic inertia (leaving diabetic patients with BP values of 140/90 mmHg or higher) at all costs, as this would lead to an unacceptable toll in terms of human lives, suffering, and socioeconomic costs.
  • Publicación
    Acceso abierto
    Feature extraction for nonintrusive load monitoring based on S-Transform
    (2014-05-01) Jiménez, Yulieth; Duarte, Cesar A.; Petit, Johann; Carrillo Caicedo, Gilberto
    The electric energy demand is dramatically growing worldwide and demand reduction emerges as an outstanding strategy; it implies detailed information about the electricity consumption, namely load disaggregation. Typical automatic methods for load disaggregation require high hardware efforts to install one sensor per appliance, whereas Non-intrusive Load Monitoring (NILM) systems diminish the hardware efforts through signal processing and mathematical modeling. One approach to NILM systems is to model the load signatures via artificial intelligence. This paper proposes to employ S-Transform for the feature extraction stage and Support Vector Machines for the pattern recognition problem. Several experiments are presented and the results of the feature extraction with S-Transform and Wavelet Packet Transform are compared. Thus promising feature vectors based on S-Transform are presented with similar or superior performance than the approach based on Wavelet Packet Transform.
  • Publicación
    Acceso abierto
    Design and development of transcutaneous electrical stimulation equipment for neuromuscular rehabilitation in individuals with facial palsy
    (2014-07-30) Quintero, Jorge Eduardo; Manotas, Gioanny Francisco; Galeano, Yuber Alejandro; Tellez, Diego Mauricio
    Peripheral facial palsy is a relatively common pathology that is usually unilateral. Multiple causes generate it, producing aesthetic and functional deformity, as well as emotional, social, and professional alterations. We developed electronic equipment for transcutaneous electric stimulation, which will be applied in neuromuscular rehabilitation treatments of individuals who have suffered peripheral facial palsy. Electrotherapeutic energy is generated through current sources, whose waveforms consist of rectangular biphasic pulses, which can be adjusted in their duration or width, frequency, and intensity. For patient electrical safety, the equipment is powered with batteries. The waveforms generated and the therapeutic parameters are controlled through a microcontroller. What differentiates this equipment from the few found in the market, for this rather specific application, is that it was designed with four independent channels for passive therapy, which permits stimulating more than one neuromuscular package at the same time, and also has one channel for active therapy, which is dynamically applied by the therapist by moving the active electrode over the surface of the face.
  • Publicación
    Acceso abierto
    Diseño y fabricación de ladrillo reutilizando materiales a base de PET
    (2014-12) Martínez Amaríz, Alejandro David; Cote Jiménez, Mónica Liliana
    Industrial processes are usually the major contaminants of the planet either by gas emissions produced during their processes or by the waste they generate. One of the most pollut-ing industries is brick production since it uses a lot of coal and supplies such as tires to generate energy. In this paper, the design and construction of a cement and PET-flake (Polietiline terephtha-late) brick is expounded. For this purpose, vari-ous compositions were studied through different resistance and compression tests using a PCE-MTS500 tensile testing machine. The results show a resistant product comparable to the commercial one -according to the Colombian Technical Stand-ard NTC 673, regarding compression resistance tests for normal concrete cylinders-; this standard sample presented an optimal compressive stress of 5600 kgf, whereas commercial bricks have a max-imum stress of only 4480 kgf. Comparative costs were also analyzed to those of the current market, offering an excellent cost benefit option as well.
  • Publicación
    Acceso abierto
    Steady state signatures in the time domain for nonintrusive appliance identification
    (2015) Jiménez, Yulieth; Duarte, Cesar A.; Petit, Johann; Meyer, Jan; Schegner, Peter; Carrillo Caicedo, Gilberto
    El paradigma de las redes inteligentes promueve aplicaciones de monitorización avanzada de carga para apoyar la gestión de la de-manda y los ahorros energéticos. La monitorización no intrusiva de carga ha generado un creciente interés para estimar la operación y el consumo individual de potencia de los aparatos residenciales, a partir de mediciones eléctricas en un solo punto. Este enfoque aprovecha las ventajas del procesamiento de señales para reducir los esfuerzos de hardware asociados a los sistemas con múltiples sensores dedicados. Algunas características distintivas de los aparatos, llamadas firmas de carga, pueden ser extraídas de señales en estado transitorio o estable. En este artículo se investiga el efecto de algunos factores que pueden afectar las firmas estacionarias de carga bajo condiciones reales: distorsión en la tensión de suministro, impedancia de la red y frecuencia de muestreo del equipo de medida. Para tal fin, se adquirieron y procesaron mediciones eléctricas de diferentes aparatos residenciales para obtener algunos índices en el dominio del tiempo. Los resultados incluyen comparaciones entre distintos escenarios y evaluación de la idoneidad y la capacidad de discriminación de la información del estado estable.
  • Publicación
    Acceso abierto
    Análisis del desarrollo de los Parques Científicos - Tecnológicos (PCTS) en Colombia
    (2015-01-15) Angulo Cuentas, Gerardo; Camacho Pico, Jaime; Romero Riaño, Efrén
    Science Technology Parks (STP), or Technology Parks (TPs), have been studied mainly in developed countries contexts. Responding to this knowledge gap, this article presents a characterization of TPs initiatives development process in Colombia through a multiple case study of parks recognized by the TPs national policy, and a comparative analysis development of them, from the point of view of five models identified in TPs literature. Typically, a TP must take on average, ten years to reach its third phase of development or maturity phase. In Colombia, the development of TPs, there are not the typical behavior because after twelve years of support provided by the Colombian state for these projects, with the enactment of TPs National Policy, three parks keep in incubation stage, as projects; the leading institution until 2012, Antioquia Technology Park announced its liquidation; and Guatiguará Technology Park although of advances in its development process, keeps in the incubation stage. Research results include identification of differentiating variables in the development of the two most developed TPs initiatives in Colombia and one analysis of future prospects of research fields.
  • Publicación
    Acceso abierto
    Capital estructural : Análisis diagnóstico en grupos de investigación y desarrollo (I+D) DE universidades públicas de Colombia
    (2015-07) Bermúdez Rojo, Maribel del Socorro; Pertuz Peralta, Vanessa Paola; Boscan Romero, Neida Coromoto
    O artigo apresenta a análise de diagnóstico do capital estrutural em grupos de pesquisa e desenvolvimento (R & D) de universidades públicas na Colômbia. O estudo ainda está postulados principalmente Sveiby (1997); (Snell et ai, 1999); Obeso (1999); TEECE (2000); Lv (2001); CIC (2003); Ordoñez (2004); Bontis (2004); Bom (2005); Ele Simo e Sallán (2008); Andriessen (2008); Alama (2008); Molina (2009); Paździor e Paździor (2012); Bratianu e Orzea (2013) e Bratianu (2014), que apontam para o capital intelectual como um fator crítico de produção, gerador de competitividade. Do mesmo modo, classificados em três componentes: humano, estrutural e relacional. No entanto, não há uma definição universalmente aceite. Os autores concordam com Bratianu (2014), e sua concepção de capital intelectual e dinâmica entrópica que se desenvolveu como potencial fase operacional. Os fundamentos da capital estrutural da CIC (2003), que dividido em organizacional e tecnológica foram consideradas; porque eles vêm de um R & D. A pesquisa foi descritiva com um projeto de campo, não experimental e transacional, foi utilizado um questionário escala do tipo Likert. Os resultados mostram como pontos fortes, em grupos, os esforços de I & D, a força tecnológica e I & D. Por seu lado, as fraquezas associadas com a propriedade intelectual e de inovação. Então, você cria modelos de gestão para monitoramento e procedimentos para a protecção do conhecimento e medir os resultados através de indicadores de força inovadoras relacionadas com a quantidade de inovação; eficácia, comparando os benefícios versus os recursos; cultura da inovação; e indicadores econômicos.
  • Publicación
    Acceso abierto
    Actividades de innovación en servicios en las pequeñas y medianas empresas comerciales del sector textil de Valledupar, Colombia
    (2016) Pertuz Peralta, Vanessa Paola; Boscan Romero, Neida Coromoto; Straccia Martínez, Daysi Coromoto; Pérez Orozco, Adith Bismarck
    The article aims to describe the service´s activities of innovation in small and medium enterprises (PYMES) in the textile sector in Valledupar, Colombia. The activities include the knowledge's acquisition and machines, preparations for innovation, market research and training processes. This research is descriptive, a field research, non-experimental and transactional. The CEO answers a Likert questionnaire. The results indicate the predominant activity is the acquisition of machinery. In contrast, there is a low acquisition of knowledge from abroad and preparation to innovate. The conclusions are the suggestion of innovation's plans; market's analyses and diversify sources of knowledge.
  • Publicación
    Acceso abierto
    A structural study of the hydrogen absorption properties by replacing vanadium with zirconium in metal alloys
    (2016) Bellon Monsalve, Daniela; Martínez Amaríz, Alejandro David; Barreneche Sarmiento, Diana-Patricia; Dos Santos, D S
    Hydrogen storage and microstructure the TiCrV0.9, TiCrV0.9Zr0.2 and TiCrV0,7Zr0.4 alloys were investigated. The alloys were melted in arc furnace, the structure was analysed by X- ray diffraction and hydrogen absorption times were analysed by Sievert’s type apparatus. The results showed that the addition of Zr replacing the V decreases in the absorption capacity passing of 3.8%wt to 2.0%wt in contrast the speed of hydrogen absorption increases considerably.
  • Publicación
    Acceso abierto
    El cambio tecnológico en el caso de los textiles inteligentes : Una aproximación desde las capacidades dinámicas
    (2016) Torres Barreto, Martha Liliana; Martínez, José Noel; Meza Ariza, Lucelly Carolina; Muñoz Molina, Leda Paz
    La industria de la confección de prendas de vestir pertenece a uno de los sectores más tradicionales de la economía, precisamente por estar vinculado a una necesidad básica del ser humano: el vestir. No obstante, durante la última década se está perfeccionando la oferta de nuevos textiles llamados "inteligentes" por sus interacciones con el entorno, ya que integran sensores y actuadores que permiten detectar y responder frente a diversos estímulos, siendo cada vez más livianos, durables y sobre todo: útiles. El surgimiento de esta nueva era de los textiles da pie a un sinnúmero de aplicaciones y la posibilidad para que empresas tradicionales de textil y confección exploren nuevos mercados, apoyadas en el desarrollo de capacidades dinámicas que les permitan mantener ventajas competitivas sostenibles. Este trabajo propone un modelo bajo el cual un conjunto de capacidades de aprendizaje sumadas a ciertas capacidades de absorción y de innovación, pueden gestar un cambio tecnológico en el sector textil confección, que necesariamente deberá verse apoyado en otro sector como el de las Tecnologías de Información y Comunicaciones.
  • Publicación
    Acceso abierto
    Quantitative phase analysis from powder diffraction using de Rietveld method in hydrogen storage alloys based on TiCr
    (2016-07-31) Martínez Amaríz, Alejandro David; Bellon Monsalve, Daniela; Reina Villamizar, Luis
    Hydrogen storage is one of the important steps in the implementation of the hydrogen economy; metal hydrides are a promising way to achieve this goal. We present in this work the use of Rietveld analysis to characterize structurally TiCr-based alloys that are able to store hydrogen. TiCr1.1V0.9, TiCr1.1V0.45Nb0.45, TiCr1.1V0.2 Nb0.8, TiCr1.1Nb0.9 alloys were synthesized in an arc furnace under argon atmosphere. The analysis of phases was developed by X-Ray Diffraction (XRD) for further refinement of both the two lattice parameters and the percentage of the phases. Our results confirmed that a structure bcc, mostly combined with a small percentage of Laves phases, leads to obtain important properties in this area. Rietveld analysis was performed by the Fullprof program and this program allows us to obtain the different structural parameters.
  • Publicación
    Acceso abierto
    Nonintrusive power estimation of residential appliances under voltage variation
    (2016-10) Jiménez, Yulieth; Cortes, Jose D.; Duarte, Cesar A.; Petit, Johann F.; Carrillo, Gilberto
    Nonintrusive Load Monitoring (NILM) systems aim to estimate the individual appliance operation and consumption in a household from measurements at a single point, in order to motivate energy conservation behaviors. Power estimation based on appliance rated powers is not always accurate because of the voltage supply variations, thus misleading load disaggregation algorithms. In this paper we propose models of power as a function of voltage for correcting the power estimation. Measurements in the laboratory of residential loads are performed under multiple voltage levels. These data are processed to find regression models. Moreover, some analytic expressions to calculate the powers are proposed. Proposed models result more accurate than the rated powers and other models in the scientific literature.
  • Publicación
    Acceso abierto
    Generación del conocimiento en empresas de seguridad y salud en el trabajo en Valledupar, Colombia
    (2017) Zambrano Morales, Carlos Mario; Pertuz Peralta, Vanessa Paola; Straccia Martínez, Daysi Coromoto
    This paper analyzes the knowledge’s generation in companies providing occupational safety and health in Valledupar, Colombia. It is supported by the theories of Davenport & Prusak (2001); and, Molina & Marsal (2001). This research is descriptive, non experimental, transversal and with field design. We applied the research to the all 17 companies. We interview the managers through a questionnaire of 25 items, validated by five experts, and 0.89 Cronbach’s α reliability. We found the most common way of generating knowledge is informal networks. We discover there are deficiencies in the acquisition, merge, and adaptation of knowledge.
  • Publicación
    Acceso abierto
    Design of a residential microgrid in Lagos del Cacique, Bucaramanga, Colombia
    (2017) Bellon Monsalve, Daniela; González Estrada, O.A.; Martínez, A .
    In this paper is presented a model that analyses the options to provide energy to an interconnected house in Lagos del Cacique, Bucaramanga, Colombia. Three power supplies were considered: photovoltaic, 1 kW wind turbine, and a 2.6kW gasoline generator, as well as a battery for energy storage. The variables considered for the sensitivity analysis correspond to the price of gasoline and the variation in loads. The simulation results suggest an optimal configuration of microgrids in generator -photovoltaic panel-battery. Sensitivity variables were specified in order to evaluate the effect of uncertainty. The simulation was done through the Homer software and the results of the combinations of sources are suggestions of the same.
  • Publicación
    Acceso abierto
    Análisis de la ciencia, tecnología e innovación desde la actividad de los observatorios en Colombia y Venezuela
    (2017-03) Pérez Orozco, Adith Bismarck; Pertuz Peralta, Vanessa Paola; Torres Moreno, Miguel Eduardo
    El artículo analiza la dinámica de la ciencia, tecnología e innovación (CTeI) en Colombia y Venezuela desde el rol de los observatorios de CTeI. Se revisó bibliografía de las diferentes justificaciones de la CTeI de algunos países (USA, Brasil) y documentos de los observatorios. Los resultados presentan diferencias en la naturaleza jurídica, la concepción estratégica y operativa. En Colombia el observatorio se sustenta en un grupo de investigación, y en Venezuela, es una entidad de administración de CTeI estatal.
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    Acceso abierto
    Desarrollo microeconómico rural a partir de la transformación de la taruya (eichornia cressipis) en comunidades campesinas
    (2017-05-12) Gutiérrez de Piñerez Rocha, Carlos Alberto; Vidal Tovar, Carlos Ramón; Cuello Quiroz, Ana-Luisa
    An alternative microeconomic model from the design and development of rural production units in three associations of fishermen swampy Zapatosa complex, from the use of Taruya (Eichornia cressipis) to diversify productive activities of these communities was implemented. Within a population of 47 associations of peasant stock declared in the region of influence of the swamp complex The Zapatosa 4 chose a craft, two of fishermen and the elderly; of these was selected the most organized and formalized for who could act as an anchor association or leader. One of the strategies developed was to present the project to the European Aid/128929/M/ACT//CO in Colombia led by the Ministry of Industry, Trade and Tourism, once approved and availability of resources, a second strategy was used inclusive development model project where they were able to strengthen three production units from innovative processes based Taruya, thus improving the income of its members. A third strategy was achieving different co-funding sources IDECESAR, ADEL Zapatosa (Agency for Local Economic Development), SENA, governor of Cesar, in this regard technical training was obtained in the different alternatives to transform Taruya SENA and ADEL Zapatosa and resources for adaptation of installations of the UPR by the governor of Cesar whose contributions were important for the improvement of the processes of transformation of Taruya. Strategies for identifying markets and industry studies were also used, they could acquire innovative equipment and machinery as well as other goods and services, high quality according to the needs reflected to achieve standardize and make inroads with the regional market competitive products.