Revistas académicas de la Universidad Católica del Norte
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On Jensen’s and the quadratic functional equations with involutions
No full textWe determine the Solutions f : S → H of the generalized Jensen’s functional equation f( x + σ(y)) + f( x + τ(y)) = 2f(x), x , y∈ Sand the solutions f : S → H of the generalized quadratic functional equationf ( x + σ(y)) + f (x + τ(y)) = 2f (x) + 2f (y), x, y ∈ S,where S is a commutative semigroup, H is an abelian group (2-torsion free in the first equation and uniquely 2-divisible in the second) and σ, τ are two involutions of S
Similarity Solution of Spherical Shock Waves -Effect of Viscosity
No full textIn this paper we investigated self-similar Solutions for Magneto Hy-drodynamic shock waves for the equation of state of Mie-Gruneisen type. Solutions are obtained numerically and the effect of viscosity (K) and the non-idealness parameter (d) on the self-similar solutions are studied in detail. The findings confirmed that, the non-idealness parameter and the viscosity parameter have major effect on the shock strength and the flow variables. All discontinuities of the physical pa-rameters are removed by the viscosity and complete flow field depends upon the magnitude of the viscosity. The obtained results are in good agreement with the results obtained by some of the researchers. All the analysis is presented pictorially in this paper
On the asymptotic behaviour of solutions of certain differential equations of the third order
No full textIn this article, Lyapunov second method is used to obtain criteria for uniform ultimate boundedness and asymptotic behaviour of solutions of nonlinear differential equations of the third order. The results obtained in this investigation include and extend some well known results on third order nonlinear differential equations in the literature
On a sequence of functions Vn (α,β,δ) (x;a, k, s)
No full textIn this paper, authors established various properties of a sequence of functions {V(α,β,γ)(x;a,k,s)/n = 0,1,2,...} such as generating relations, bilateral generating relations, finite summation formulae, generating functions involving Stirling number, explicit representation and integral transforms
Modelos de diagnóstico cognitivo:: fundamentos, didáctica y aplicaciones en ciencias del comportamiento
Get PDFCDMs represent a multidimensional choice in psychometrics when observable and latent variables are believed to be categorical.The study presents a thorough revision of the literature about original models, as well as its applications and current developments in psychometric research. Additionally, a revision of statistical software to estimate models and examples of applications in behavioral sciences and health care is also presented. Didactic examples based on simulated data show the capability of models to classify people according to their latent attributes.Los modelos de diagnóstico cognitivo representan una alternativa multidimensional en psicometría cuando se asume que las variables observables y latentes son categóricas. El presente artículo hace una revisión de la literatura sobre los modelos originales, así como aplicaciones y avances recientes en investigación psicométrica en este tema. Además, se incluye una revisión de software estadístico utilizado para la estimación de los modelos y ejemplos de su aplicación en ciencias del comportamiento y de la salud. Ejemplos didácticos con datos simulados demuestran la capacidad de los modelos para clasificar a las personas de acuerdo a sus atributos latentes
Estudio de propiedades psicométricas de un cuestionario de afrontamiento, apoyo social y conducta alimentaria en personas con diabetes e hipertensión
Get PDFINTRODUCTION: Adapting to chronic disease is a complex process influenced by psychosocial factors. Considering the rather limited time of medical consultations, it would be beneficial to have instruments that evaluate these psychosocial factors quickly and easily, allowing the identification of potential focuses of intervention. OBJECTIVE: To analyze the psychometric properties of a questionnaire that assesses coping with chronic illness, social support and eating behavior in people with diabetes and/or hypertension. METHODS: The questionnaire is composed of a set of 25 items generated by both the authors and existing questionnaires. The subjects for this study are 216 diabetes and/or hypertension patients, who joined a remote monitoring program for these pathologies. The analysis considered parallel analyzes for the number of factors, factorial analysis (principal axis), reliability and multiple linear or logistic regression with data reported by the patients (for example, HbA1c) as well as and observable data obtained with a telemonitoring program (biochemical glycemia data and/or blood pressure and adherence to the program). RESULTS: Five factors were identified: active, avoidance and passive resignation coping, overfeeding and social support. Factors presented a reliability of .54 to .91. Coping strategies were associated with adherence to treatments and pathology severity. CONCLUSIONS: Results suggest the questionnaire has acceptable psychometrical properties, allowing the identification of psychosocial aspects that influence the management and prognosis of the pathology.INTRODUCCIÓN: La adaptación a la enfermedad crónica es un proceso complejo que se ve influenciado por aspectos psicosociales. Considerando la corta duración las consultas médicas, sería beneficioso contar con instrumentos que evalúen estos aspectos de manera rápida y simple, permitiendo identificar posibles focos de intervención. OBJETIVO: El objetivo de este estudio fue analizar las propiedades psicométricas de un cuestionario que evalúa afrontamiento de la enfermedad crónica, apoyo social y conducta alimentaria en personas con diabetes y/o hipertensión. METODO: Para la construcción del cuestionario se generó un conjunto de ítems, tanto creados por los autores como obtenidos a través de una revisión de cuestionarios existentes, de los cuales se seleccionaron 25. Participaron 216 individuos con diabetes y/o hipertensión, que ingresaban a un programa de monitoreo a distancia de su patología. Se realizaron análisis paralelo para el número de factores, análisis factorial de ejes principales, de confiabilidad y de regresión lineal múltiple y logística con datos informados por los pacientes (por ejemplo: HbA1c) y observables a través del programa de telemonitoreo (datos bioquímicos de glicemia y/o presión arterial y adherencia al programa). RESULTADOS: Se extrajeron 5 factores que se denominaron: afrontamiento activo, evitativo y de resignación pasiva, sobrealimentación y apoyo social. Los factores presentaron una fiabilidad de .54 a .91. Las estrategias de afrontamiento se asociaron a adherencia a los tratamientos y gravedad de la patología. CONCLUSIONES: Los resultados sugieren que el cuestionario posee propiedades psicométricas aceptables, permitiendo pesquisar aspectos psicosociales que influyen en el manejo y pronóstico de la patología
El bienestar psicológico y la satisfacción con la vida como predictores del bienestar social en una muestra de universitarios ecuatorianos
Get PDFOBJETIVO: En el presente estudio se busca determinar el papel predictor del Bienestar Psicológico y la Satisfacción con la Vida en el Bienestar Social en una muestra de estudiantes universitarios. METODO: Participaron 449 estudiantes de una universidad pública y una cofinanciada de la ciudad de Ambato, Ecuador, los cuales fueron evaluados con los cuestionarios de Satisfacción con la vida, Bienestar Psicológico y Bienestar Social. Se compararon por universidad de procedencia los resultados, se correlacionaron los mismos y se procedió a un análisis de regresión lineal múltiple jerárquica. RESULTADOS: Hay una correlación entre la Satisfacción con la Vida y el Bienestar Psicológico r= .598; p< .001. Por otra parte, la Satisfacción con la vida r= .447; p< .001 y el Bienestar Psicológico r= .568; p< .001 se correlacionan con el Bienestar Social. Los elementos del Bienestar Psicológico pueden explicar en un 48,6% los cambios de la varianza del Bienestar Social. CONCLUSION: Los resultados demuestran que el bienestar psicológico es un predictor del bienestar social y por lo tanto impactar en su dinámica.ABSTRACTOBJECTIVE: This paper aims to determine the predicting role of psychological well-being and satisfaction with life in social welfare in Ecuadorian university students. METHOD: The sample was composed of 449 students from a public university and a semi-private one both located in the city of Ambato, Ecuador. These participants were evaluated with the Satisfaction with Life, Psychological Welfare and Social Welfare questionnaires. Results in each university were compared and correlated with a hierarchical multiple linear regression. RESULTS: There is correlation between satisfaction with life and psychological well-being r = .598; p <.001. Moreover, satisfaction with life r = .447; p <.001 and psychological well-being r = .568; p <.001 correlate with social welfare. The elements of psychological well-being explain in 48.6% the changes in the social welfare variance. CONCLUSION: Results show that psychological well-being is a predictor of social well-being; therefore, it impacts significantly on its dynamics
Strong right fractional calculus for Banach space valued functions
No full textWe present here a strong right fractional calculus theory for Banach space valued functions of Caputo type. Then we establish many right fractional Bochner integral inequalities of various types
On wreath product of permutation groups
No full textThis report is essentially an upgrade of the results of Audu (see [1] and [2]) on some finite permutation groups. It consists of the basic procedure for computing wreath product of groups. We also discussed the conditions under which the wreath products of permutation groups are faithful, transitive and primitive. Further, the centre of the stabilizer and the centre of wreath products was investigated and finally, an illustration was supplied to support our findings
Existence of solutions for a system of elastic wave equations
No full textA simple and short proof of the existence of solutions for the direct scattering problem associated with the system of elastic wave equations is shown