CAVIEDES SOTO, IVAN RICARDO
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CAVIEDES SOTO, IVAN RICARDO
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icaviedes@udd.cl
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25935759500

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Exploring Initialization Strategies for Metaheuristic Optimization: Case Study of the Set-Union Knapsack Problem

2023 , José García , Andres Leiva-Araos , Broderick Crawford , Ricardo Soto , Hernan Pinto

In recent years, metaheuristic methods have shown remarkable efficacy in resolving complex combinatorial challenges across a broad spectrum of fields. Nevertheless, the escalating complexity of these problems necessitates the continuous development of innovative techniques to enhance the performance and reliability of these methods. This paper aims to contribute to this endeavor by examining the impact of solution initialization methods on the performance of a hybrid algorithm applied to the set union knapsack problem (SUKP). Three distinct solution initialization methods, random, greedy, and weighted, have been proposed and evaluated. These have been integrated within a sine cosine algorithm employing k-means as a binarization procedure. Through testing on medium- and large-sized SUKP instances, the study reveals that the solution initialization strategy influences the algorithm’s performance, with the weighted method consistently outperforming the other two. Additionally, the obtained results were benchmarked against various metaheuristics that have previously solved SUKP, showing favorable performance in this comparison.

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Ventrículo derecho: Relación con patología respiratoria y patología del ventrículo izquierdo

2010 , CAVIEDES SOTO, IVAN RICARDO , POLENTZI URIARTE G. DE C , CRISTIÁN LÓPEZ H

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Minute ventilation to carbon dioxide production ratio is a simple and non-invasive index of ventilatory inefficiency in mechanically ventilated patients: proof of concept

2017 , René López , CAVIEDES SOTO, IVAN RICARDO , Jerónimo Graf

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Nasolaryngoscopic Validation of a Set of Clinical Predictors of Aspiration in a Critical Care Setting

2010 , CAVIEDES SOTO, IVAN RICARDO , LAVADOS GERMAIN, PABLO MANUEL , HOPPE WIEGERING, ARNOLD JOHANNES GOTTLIEB , López, María A.

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Non-Answered Questions in Patients with Endobronchial Valve Placement for Lung Volume Reduction

2018 , CAVIEDES SOTO, IVAN RICARDO , Gonzalo Labarca , Hugo G. de Oliveira , Felix J.F. Herth , Sebastián, Fernandez-Bussy

Endoscopic lung volume reduction is a minimally invasive procedure performed to reduce the space occupied by the emphysemas’ lobes. This procedure has been demonstrated to be beneficial for patients with advanced chronic obstructive pulmonary disease and severe hyperinflation. The use of endobronchial valves is increasing, as well as the number of reports of adverse events. The most common complications after the procedure are a pneumothorax, bleeding, infections, the need for valve removal, and valve expulsion. We have recently treated a patient who achieved immediate left upper lobe atelectasis but developed a pneumothorax on the 6th day and near-fatal kinking of the left lower lobe bronchus. This patient had asphyctic episodes probably due to a functional left pneumonectomy. We should consider this unusual complication in patients undergoing endoscopic lung volume reduction whose condition worsens after achieving complete lobar atelectasis.

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Dyspnea Postpulmonary Embolism

2020 , CAVIEDES SOTO, IVAN RICARDO , Rodrigo Soto

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Clinical prediction of aspiration in acute neurological patients

2005-12-01 , CAVIEDES SOTO, IVAN RICARDO , LAVADOS GERMAIN, PABLO MANUEL , HOPPE WIEGERING, ARNOLD JOHANNES GOTTLIEB , López O., Angélica

Glottic dysfunction is a frequent condition in patients with acute neurological diseases: the incidence in stroke patients is between 45-51% increasing mortality three times. The principal complication is aspiration, which demands the involvement of pulmonary physicians and neurologists. The purpose of this study is to evaluate wet voice, water swallow test and cervical auscultation as clinical predictors of aspiration using endoscopical observation as a gold standard. During a period of one year we have prospectively evaluated these tests in acute neurological patients hospitalized in an intensive care unit. Wet voice, 3 oz water swallow test and cervical auscultation demonstrated sensibilities of 66.7, 88.9 and 77.8%, with a respective specificity of 85.2, 59.3 and 77.8%. Positive predictive values were 60, 42.1 and 53.8%, with negative predictive values of 88.5, 94.1 and 91.3% respectively. These results support the utility of clinical aspiration screening as a simple and valuable technique that can be done at the bedside.

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The ventilatory inefficiency measured as VE/VCO2 slope is increased in patients who fail to spontaneous breathing trial

2018 , LOPEZ HERNANDEZ, RENE RAMON , PEREZ ARAOS, RODRIGO ALEJANDRO , CAVIEDES SOTO, IVAN RICARDO , GRAF SANTOS, JERÓNIMO

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Characterization of pleuroparenchymal fibroleastosis in two respiratory reference centers in santiago, chile

2020 , Gina Miranda , Laura Mendoza , NADIA HERRERA , Vivianne Agar , Claudio Silva , CAVIEDES SOTO, IVAN RICARDO

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Clinical screening of oropharyngeal dysphagia: standard of care

2017 , CAVIEDES SOTO, IVAN RICARDO , Sebastian Fernandez-Bussy , Gonzalo Labarca , Felix J.F. Herth

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