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Medellin, Colombia

The Pontifical Bolivarian University , also referred to as UPB, is a private university in Colombia with its main campus in Medellín, where it was founded in 1936. Currently, the university has campuses in other Colombian cities, such as Bogotá, Bucaramanga, Montería and Palmira. The university has a student and faculty population that was estimated at 21,368 and an alumni population of 44,346 as of September, 2006.Presently the university offers 77 undergraduate programs, 24 master programs and 7 doctorate programs nationwide. The university groups its educational programs under the schools of Architecture And Urbanism, Design, Engineering, Health science, Law and Political science, Strategic science , Social science, Education and Teaching, and Theology, Philosophy and Humanities. The university also operates elementary and high school programs under its educational umbrella.The University has several distinguished alumni such as Former President of Colombia Belisario Betancur Cuartas, and Former First Lady of Colombia Lina María Moreno Mejía. Wikipedia.

Cortes F.B.,Pontifical Bolivarian University | Chejne F.,National University of Colombia
Meat Science | Year: 2010

A rapid and novel approach for predicting sorption isotherms based on the Polanyi theory is proposed. This approach allows the prediction of the sorption isotherms at different temperatures from one experimental isotherm. The theoretical predictions of isotherms and isosteric heats were validated successfully using data from the literature for different meat types. This method allows total experimental time and operation costs to be reduced. © 2010 The American Meat Science Association.

Moreno J.A.,National Autonomous University of Mexico | Osorio M.,Pontifical Bolivarian University
IEEE Transactions on Automatic Control | Year: 2012

A method to construct a family of strict Lyapunov functions, i.e., with negative definite derivative, for the super-twisting algorithm, without or with perturbations, is provided. This second order sliding modes algorithm is widely used to design controllers, observers and exact differentiators. The proposed Lyapunov functions ascertain finite time convergence, provide an estimate of the convergence time, and ensure the robustness of the finite-time or ultimate boundedness for a class of perturbations wider than the classical ones for this algorithm. Since the Lyapunov functions and their derivatives are quadratic forms, the operation with them is as simple as for linear time invariant systems. © 2011 IEEE.

Jaimes N.,Pontifical Bolivarian University | Marghoob A.A.,Sloan Kettering Cancer Center
Dermatologic Clinics | Year: 2013

Differentiating dysplastic nevi from melanoma remains one of the main objectives of dermoscopy. Melanomas tend not to manifest any of the benign patterns described for nevi and instead usually display chaotic dermoscopic morphologies. Melanomas located on the face, chronically sun-damaged skin, volar surfaces, nails, and mucosal surfaces have additional features that can assist in their identification. However, some melanomas lack any defined dermoscopic structures. These so-called featureless melanomas can be identified via digital surveillance. This article reviews the melanoma-specific structures as a function of anatomic location (ie, melanomas on nonglabrous skin, face, volar surfaces, mucosae, and nails). © 2013 Elsevier Inc.

Salazar A.,Pontifical Bolivarian University
Optics Communications | Year: 2013

A study of the speckle photo-electromotive force (PEMF) in a photorefractive sensor of amplitudes of micro-oscillations is presented. The experimental behavior of the first harmonic of the photocurrent generated as a function of the average speckle diameter and the oscillation amplitude of the speckle pattern is analyzed for a sensor implemented with a Bi 12SiO20 (BSO) crystal. For a given light intensity, a nearly constant value of the maximum amplitude of the first harmonic was experimentally observed for the range of speckle sizes considered. This experimental result and the linear dependence of the vibration amplitude yielding the maximum of the photocurrent as a function of the speckle diameter were appropriately described by the mathematical model considered. Results show the possibility of adequately selecting the speckle size to optimize the output of speckle PEMF-based sensors depending on the oscillation amplitude to be measured. © 2013 Elsevier B.V. All rights reserved.

Krikorian A.,Pontifical Bolivarian University | Limonero J.T.,Autonomous University of Barcelona | Corey M.T.,Boston University
Journal of Palliative Medicine | Year: 2013

Background: The prevention and relief of suffering in palliative care are critical to the well-being and quality of life of patients and families facing life-threatening diseases. Many tools to assess different issues in health care are available, but few are specifically designed to evaluate suffering, which is essential for its prevention, early management, and treatment. Objective: The purpose of this review was to identify and describe existing instruments developed to assess suffering in palliative care, as well as to comment on their psychometric properties. Methods: A review of articles indexed in MEDLINE, PsycINFO, and SciELO up to June 2011 was conducted. All articles reporting the development, description, or psychometric properties of instruments that assess suffering were included. An assessment of their psychometric quality was performed following a structured checklist. Results: Ten instruments that assess suffering were identified. Their main features and psychometric properties are described in order to facilitate the selection of the appropriate one given each patient's context. Conclusion: By taking into consideration all features of the assessment instruments under review, the evaluation of suffering can be made easier. A wide and ever expanding range of approaches is now available, which facilitates the selection of the suffering-assessment instrument that is best suited to the needs of the specific patient. One of the challenges ahead will be to further analyze the psychometric properties of some existing instruments. © Mary Ann Liebert, Inc.

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