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Search Results: 1 - 10 of 56752 matches for " Ojeda Ch. Luis Roberto "
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Algoritmos y programas
Ojeda Ch. Luis Roberto
Ingeniería e Investigación , 2000,
Abstract: Este artículo presenta un tema fundamental en ciencias de la computación: la posible existencia de algoritmos para realizar cualquier tarea. Se trata de precisar esta posibilidad siguiendo esquemas de raciocinio satisfactorios aunque no excesivamente rigurosos, a fin de motivar a una amplia audiencia alrededor de estos temas.
Los algoritmos como instrumento de la matemática
Ojeda Ch. Luis Roberto
Ingeniería e Investigación , 1993,
Abstract: El concepto de algoritmo es fundamental en múltiples campos de la actividad humana. Se relacionan en este artfculo los conceptos de función y de algoritmo para luego caracterizar un tipo especial de función: el de las recursivas. Finalmente se establece la Tesis de Alonzo Church que indica que sólo para las funciones recursivas pueden obtenerse algoritmos de evaluación.
Los algoritmos genéticos y el método de generación y prueba
Ojeda Ch. Luis Roberto
Ingeniería e Investigación , 1998,
Abstract: Este trabajo pretende mostrar dos paradigmas de solución de problemas en inteligencia artificial. Los algoritmos genéticos han tomado una posición destacada en los últimos tiempos y el método de generación y prueba, cuyo perfil se aproxima al fundamento de los algoritmos genéticos constituye la forma de dise o de DENDRAL, un producto ampliamente reconocido en IA. Se desea mostrar que ambos paradigmas se ubican naturalmente dentro de las expectativas de la inteligencia artificial.
Una propuesta de la lógica terminológica: el lenguaje de conceptos
Lizcano Bueno Luis Ignacio,Ojeda Ch. Luis Roberto
Ingeniería e Investigación , 2002,
Abstract: This paper describes the concept languages or description logics (DLs) ofthe KLONE family. The concept languages allow to represent the knowledge of a domain by the concepts and roles, where the concepts model individual classes and roles determine relationships between the classes. Of the combination of atomic concepts and atomic roles with suitable constructors can be generated concept expressions. The concept languages are given a Tarski style declarative semantics where the concepts are interpreted as subsets of a domain and roles as binary relations. The semantics of concepts identifies concept languages as fragments of first order predicate logic. The reasoning overthe concepts is based in the subsumption relationship. Which implicitly defines a taxonomic between the concepts. El presente artículo describe los lenguajes de conceptos o lógicas descriptivas (DLs: Description Logics) de la familia KLONE. Los lenguajes de conceptos permiten representar el conocimiento de un dominio por medio de conceptos y roles, donde los conceptos modelan clases de individuos y los roles especifican relaciones entre las clases. De la combinación de conceptos atómicos y roles atómicos con adecuados constructores se generan expresiones de conceptos. Los lenguajes de conceptos están dotados de la semántica declarativa al estilo de Tarski. donde los conceptos son interpretados como subconjuntos de un dominio, y los roles como relaciones binarias. La semántica de conceptos identifica los lenguajes de conceptos como fragmentos de la lógica de predicados de primer orden. El razonamiento sobre los conceptos está basado en la relación de subsumisión. Esta relación implícitamente define una taxonomía entre los conceptos
Toma de decisiones multicriterio un panorama conceptual
Astaiza Amado Luis Gerardo,Ojeda Ch. Luis Roberto
Ingeniería e Investigación , 1989,
Abstract: El objetivo fundamental de este artículo es dar un punto de partida sobre análisis de decisión con objetivos múltiples.
Quality of Academic Work, College Life, and Work Environment in a Public State University in Mexico, from the Teacher’s Perception  [PDF]
José Luis Arcos Vega, Fabiola Ramiro Marentes, Miguel ángel Ojeda Ruíz De La Pe?a, Gustavo Rodolfo Cruz Chávez
Creative Education (CE) , 2018, DOI: 10.4236/ce.2018.99108
Abstract: This study has the objective to describe academic work quality and work environment of Autonomous University of Baja California South, in Mexico, from the teacher’s perspective. We used a quantitative, non-experimental, cross-sectional, descriptive method (Hernández, Fernández, & Baptista, 2014). We applied, electronically, a structured survey based on the change instruments and organizational environment designed by Kraut (1996). The analysis categories were academic work, work environment, college life, and decision making in the institution. The sample was non-probabilistic, of opportunity, obtaining the participation of 107 teachers of many campus located in the cities of La Paz, Cabo San Lucas, Loreto, Ciudad Insurgentes, and Guerrero Negro. The data analysis technique was descriptive, and processed in an electronic system corresponding to year 2013. The results showed a high commitment of teachers to values and principles of the Institutions (94.4%), strengthening their identity and belonging to the Institution.
Dynamics of Rough Interfaces in Chemical Vapor Deposition: Experiments and a Model for Silica Films
Fernando Ojeda,Rodolfo Cuerno,Roberto Salvarezza,Luis Vazquez
Physics , 2000, DOI: 10.1103/PhysRevLett.84.3125
Abstract: We study the surface dynamics of silica films grown by low pressure chemical vapor deposition. Atomic force microscopy measurements show that the surface reaches a scale invariant stationary state compatible with the Kardar-Parisi-Zhang (KPZ) equation in three dimensions. At intermediate times the surface undergoes an unstable transient due to shadowing effects. By varying growth conditions and using spectroscopic techniques, we determine the physical origin of KPZ scaling to be a low value of the surface sticking probability, related to the surface concentration of reactive groups. We propose a stochastic equation that describes the qualitative behavior of our experimental system.
A Non-sterically Preferred Conformation in Bis-1,4-(2-methyl-4, 5-dihydro-1H-benzo[g]indolyl)benzene
Luis Chacón García,Roberto Martínez,María Isabel Chávez
Revista de la Sociedad Química de México , 2002,
Abstract: Se describe el análisis conformacional del compuesto nombrado en el título. Los resultados muestran que la conformación preferida no es la esperada a partir de consideraciones estéricas. El cambio de disolvente de CDCl3 a benceno-d6 no tuvo efecto significativo en el equilibrio.
Embarazo en adolescentes y su influencia en los indicadores perinatales en 2 hospitales ginecoobstétricos
Hernández Cabrera,Jesús; Alonso Hernández,Dayma; Rodríguez Pino,Midiala; Homma Castro,José Luis; Díaz Olano,Inés; Suárez Ojeda,Roberto;
Revista Cubana de Obstetricia y Ginecolog?-a , 2003,
Abstract: in spite of the systematic educational work carried out as regards pregnancy in adolescence all over the country since the 70's, an increase is observed at the health care units with a negative repercussion on the indicators of morbidity and perinatal mortality i. as a result of it , a prospective and descriptive study of the results attained by "julio alfonso medina" gynecoobstetric teaching hospital, in matanzas, during 2001, and by "mario mu?oz monroy" territorial hospital, in colón, from 1999 to 2001, was conducted. of 3 000 births ocurrred at the hospital of matanzas, 362 corresponded to adolescents for an incidence of 12,06 %, and of a total of 7 195 births that took place at the hospital of colón, 895 were also adolescents, for an incidence of 12.4 %.the results were discussed and compared and it was observed that although with very similar incidences, there was a significant increase of cesarean section, preterm gestational time with the subsequent rise of the low birth weight indicator, and an elevated index of asphyxia and influence of this group on late fetal mortality differently from the results of the provincial teaching hospital.
Características de la insuficiencia cardíaca en pacientes con fracción de eyección preservada: Resultados del Registro Nacional de Insuficiencia Cardíaca, Grupo ICARO
Vukasovic R,José Luis; Castro G,Pablo; Sepúlveda M,Luis; Nazzal N,Carolina; Garcés F,Eduardo; Concepción Ch,Roberto; Soto S,Juan Ramón; Yovaniniz L,Patricio; Ferrada K,Marcela; Cavada Ch,Gabriel;
Revista médica de Chile , 2006, DOI: 10.4067/S0034-98872006000500001
Abstract: background: heart failure (hf) with preserved ejection fraction (ef) is a condition of growing interest due to its high prevalence and difficult management. aim: to evaluate the clinical profile of patients hospitalized with hf and preserved ef in chilean hospitals. material and methods: prospective registry of 15 centers. among 649 patients hospitalized in functional class iii and iv, an echocardiogram was performed to 353. preserved ef was defined quantitatively as an ef >50%. results: out the 353 patients, 45% presented an ef >50%. mean age in patients with ef >50 and -50% was 66±13 and 67±13 years, respectively. among patients with hf and ef >50%, the proportion of women was higher (73.7 and 36.3%, p <0.001), the proportion of patients with a history of hypertension (76.8 and 65.5%, p <0.05) and the presence of atrial fibrillation was also higher (62.3 and 47.8%, p <0.01) and a history of myocardial infarction was lower (17.1 and 29.5%, p <0.05). the diastolic diameter of the left ventricle was significantly lower in hf with preserved ef (51.0+10 and 63.5+10 mm respectively, p <0.001). no differences in the length of hospital stay and mortality were observed between hf with depressed and preserved ef. female gender was an independent predictor for the presence of hf with preserved ef (odds ratio: 2.62; confidence intervals: 1.1-6.1). conclusions: hf and preserved ef is common among hospitalized patients, particularly in women and subjects with a history of hypertension and atrial fibrillation. hospitalization length and mortality were similar in patients with either preserved or depressed ef
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