Now showing items 751-770 of 796

    • Ultrasound image enhancement: A review 

      Contreras Ortiz S.H.; Chiu T.; Fox M.D. (2012)
      Medical ultrasound imaging uses pulsed acoustic waves that are transmitted and received by a hand-held transducer. This is a mature technology that it is widely used around the world. Among its advantages are that it is ...
    • Umbilical cord and preeclampsia 

      Olaya-C M.; Salcedo-Betancourt J.; Galvis S.H.; Ortiz A.M.; Gutierrezb S.; Bernal J.E. (IOS Press, 2016)
      Preeclampsia is associated with abnormalities in the umbilical cord in several ways: morphological, biochemical and functional. Alteration in blood vessels of the placenta, decidua and circulatory system of the fetus might ...
    • Understanding motorcyclist-related accidents in Colombia 

      Ospina-Mateus, Holman; Quintana Jiménez, Leonardo Augusto; Lopez-Valdes, Francisco J. (Cartagena de IndiasCampus Tecnológico, 2020-02-11)
      In 2016, Colombia’s position regarding motorcyclist fatalities per 100,000 inhabitants was tenth worldwide and second in South America. In the seven years from 2012-2018, the proportion of deceased and injured motorcyclists ...
    • Understanding the impact of physical fatigue and postural comfort experienced during motorcycling: A systematic review 

      Ospina-Mateus H.; Quintana Jiménez L.A. (Elsevier Ltd, 2019)
      Background: This literature review examines reports on the effects of fatigue and comfort on the motorcycle driving experience and evaluates studies of associated relevant risk factors for musculoskeletal disorders. Methods: ...
    • Unidades didácticas en física como potenciadores del aprendizaje en estudiantes de ingeniería 

      Jimenez, Francy N.; Beleño, Ligia; Agudelo, Jairo de J.; Muñiz, Jorge L. (Cartagena de Indias, 2020-12)
      El objetivo del presente trabajo fue diseñar e implementar unidades didácticas en temas de física clásica y medir su impacto en los procesos de aprendizaje de estudiantes de ingeniería. El diseño de las unidades didácticas ...
    • Use of deep learning algorithms for real-time detection of vessels in confined spaces using the Tensorflow framework 

      Sánchez, S A; Campillo, J; Martínez-Santos, J C (Cartagena de Indias, 2003-01)
      Over 4515 small boat accidents were registered in the United State of America in 2012, resulting in 651 causalities and 22% of the accidents took place between two boats. It is, therefore, one of the most interesting ...
    • Use of Edge Computing for Predictive Maintenance of Industrial Electric Motors 

      De Leon V.; Alcazar Y.; Villa J.L. (Springer, 2019)
      Industrial Internet of Things has become a reality in many kind of industries. In this paper, We explore the case of high quantity of raw data generated by a machine. In the aforementioned case is not viable store and ...
    • Using close range photogrammetric method to estimate kinetic variables in olympic-style weightlifting 

      Magre L.A.; Martinez Santos J.C. (Institute of Electrical and Electronics Engineers Inc., 2014)
      Olympic-style weightlifting, or weightlifting, is an athletic discipline that has as a goal lift the heaviest amount of weight attached a weight set. Weightlifting complements other athletic disciplines to increase power ...
    • Using Data-Mining Techniques for the Prediction of the Severity of Road Crashes in Cartagena, Colombia 

      Ospina-Mateus H.; Quintana Jiménez L.A.; López-Valdés F.J.; Morales-Londoño N.; Salas-Navarro K. (Springer, 2019)
      Objective: Analyze the road crashes in Cartagena (Colombia) and the factors associated with the collision and severity. The aim is to establish a set of rules for defining countermeasures to improve road safety. Methods: ...
    • Validation of instruments as a guarantee of credibility in scientific research 

      Fernández R.L.; Martínez R.A.; Urquiza D.E.P.; Gálvez S.S.; Álvarez M.Q. (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 ...
    • Validation of the Streeter-Phelps Model in Matlab to predict biochemical demand for oxygen DOB and dissolved oxygen OD 

      Maza, Meléndez; Rodríguez-Arías, Andy J.; Pasqualino, Harold A.; Pasqualino, Jorgelina (Cartagena de Indias, 2020-12-24)
      The article intended the validation of the Streeter Phelps mathematical model that describes the behavior of dissolved oxygen OD and the biochemical oxygen demand BOD, which includes re- aeration and deoxygenation processes, ...
    • Variable control tool in MATLAB for energy transformation processes 

      Cardenas, Y; Carrillo, G E; Alviz, A; Carrillo, G (Cartagena de Indias, 2020-10)
      During the stages of transformation of energy in a process, exercise control over the variables that intervene in it, improve its performance, and identify undesirable conditions in these. Thus, this study is developed as ...
    • Variation in experimentation styles and domain-specific knowledge 

      Córdoba M.; Larreamendy-Joerns J. (2007)
      This study explored the relationship between experimental strategies and domain-specific knowledge within a task of scientific discovery. Groups of expert biologists, experimental psychologists, and lag people in both ...
    • Variational thermodynamics of relativistic thin disks 

      Gutiérrez-Piñeres A.C.; Lopez-Monsalvo C.S.; Quevedo H. (Springer New York LLC, 2015)
      We present a relativistic model describing a thin disk system composed of two fluids. The system is surrounded by a halo in the presence of a non-trivial electromagnetic field. We show that the model is compatible with the ...
    • Vehicle speed estimation using audio features and neural networks 

      Giraldo-Guzman J.; Marrugo A.G.; Contreras-Ortiz S.H. (Institute of Electrical and Electronics Engineers Inc., 2017)
      Many car accidents that result in pedestrian deaths or serious injuries are due to their inattention when crossing the street. Pedestrians often get distracted using mobile phones or music players, what prevents them to ...
    • Vehicular road influence areas 

      Huertas M.E.; Huertas J.I.; Valencia A. (Elsevier Ltd, 2017)
      Vehicle operation over paved and unpaved roads is an emission source that significantly contributes to air pollution. Emissions are derived from vehicle exhaust pipes and re-suspension of particulate matter generated by ...
    • Viable business models for M-commerce: The key components 

      Gan J.; Gutiérrez J.A. (IGI Global, 2011)
      As mobile applications increase in popularity, the issue of how to build viable business models for the m-commerce industry is becoming a clear priority for both organizations and researchers. In order to address this ...
    • Vibration analysis of shear deformable shallow shells using the Boundary Element Method 

      Useche J. (2014)
      In this work, the modal and harmonic analysis of elastic shallow shells, using a Dual Reciprocity Boundary Element formulation, is presented. A boundary element formulation based on a direct time-domain formulation using ...
    • Vibrational response of elastic membranes coupled to acoustic fluids using a BEM–BEM formulation 

      Useche J.; Narvaez A. (Springer New York LLC, 2014)
      In the last two decades, few works have been reported in the literature related to analysis of fluid–structure interaction problems using Boundary Element Method for modeling both structure and fluid. To the author’s ...
    • Virtual lab in Modelica of a cement clinker cooler for operator training 

      Acuña O.; Martin-Villalba C.; Urquia A. (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 ...