• Pedagogies for the open knowledge society

      Ricaurte Quijano, Paola; Tecnologico de Monterrey (Springer Open, 31/08/2016)
      Learning challenges within the knowledge society cannot be limited to the technological dimension. Learning and education are embedded in economic, political and cultural contexts. Pedagogies reflect this social condition. Consequently we need to situate the pedagogical practices on a wider debate regarding their place in the global system of knowledge production. Some questions are relevant in assessing these practices: What is the sense of learning in the knowledge society? How this technological paradigm modifies our conception of learning and education? How pedagogies are related to technology and the global system of knowledge production? What principles are associated with these proposals? Through a case study of two learning environments, Wikipedia and Google, we compare the two models and the values, principles and competences associated to each of them.
    • Violencia en las Aulas

      Hernández Hernández, María I. (Tecnológico de Monterrey, 31/05/2013)
    • Agresión y violencia en preescolar y su impacto en la sociedad del conocimiento

      Cortés Barragán, Eloina (Tecnológico de Monterrey, 31/05/2013)
    • "Ana, no quiere problemas".

      Arroyo, Susana G. (Tecnológico de Monterrey, 31/05/2013)
    • Modelling gene expression profiles related to prostate tumor progression using binary states

      Martinez, Emmanuel; Trevino, Victor (Open Access Publisher, 31/05/2013)
      Abstract Background Cancer is a complex disease commonly characterized by the disrupted activity of several cancer-related genes such as oncogenes and tumor-suppressor genes. Previous studies suggest that the process of tumor progression to malignancy is dynamic and can be traced by changes in gene expression. Despite the enormous efforts made for differential expression detection and biomarker discovery, few methods have been designed to model the gene expression level to tumor stage during malignancy progression. Such models could help us understand the dynamics and simplify or reveal the complexity of tumor progression. Methods We have modeled an on-off state of gene activation per sample then per stage to select gene expression profiles associated to tumor progression. The selection is guided by statistical significance of profiles based on random permutated datasets. Results We show that our method identifies expected profiles corresponding to oncogenes and tumor suppressor genes in a prostate tumor progression dataset. Comparisons with other methods support our findings and indicate that a considerable proportion of significant profiles is not found by other statistical tests commonly used to detect differential expression between tumor stages nor found by other tailored methods. Ontology and pathway analysis concurred with these findings. Conclusions Results suggest that our methodology may be a valuable tool to study tumor malignancy progression, which might reveal novel cancer therapies.
    • Estimación de la Heredabilidad del área Foliar y sus Componentes en la Planta de Maíz

      La Garza y Garza, Filiberto D. (Instituto Tecnológico y de Estudios Superiores de Monterrey, 31/05/1905)
      Notas del catalogo: Tesis ( Ingeniero Agronomo Administrador ) ITESM.
    • Fracciones parciales

      Zatarain, Paola; Adame Rodríguez, Silvia I.; Navarro, Javier (Tecnológico de Monterrey, 31/01/2011)
    • Factorización de polinomios

      Zatarain, Paola; Adame Rodríguez, Silvia I.; Navarro, Javier (Tecnológico de Monterrey, 31/01/2011)
    • MIMO channel capacity using antenna selection and water pouring

      Cuan Cortes, Jose V.; Vargas-Rosales, Cesar; Munoz Rodriguez, David (Springer Open, 30/12/2014)
      Abstract The use of multiple-input multiple-output (MIMO) communication systems has attracted considerable attention due to capacity and performance improvements without increasing the required bandwidth or transmission power. Although MIMO improves the transmission rate and provides reliable communication, these advantages come at a high cost, since multiple radio frequency (RF) chains have to be employed. Therefore, cost-effective implementation of MIMO systems remains as an important challenge. In this sense, antenna selection techniques (AST) can help reduce the high cost of MIMO systems, while retaining most of their benefits; and in order to improve channel capacity, transmission power can be allocated efficiently according to the channel experienced by each antenna element. In this paper, we show the channel capacity improvement of MIMO systems, by combining the use of AST and transmission power allocation through the water-pouring algorithm (WPA) for different antenna configurations. We apply WPA and allocate more power to the channel with better conditions, when the MIMO channel is Rayleigh distributed and noise is Gaussian. By employing these two techniques (AST and WPA), we show that channel capacity is significantly improved, with higher capacity values than those obtained using traditional systems which just spread equal power among all the transmit antennas. We also show that bounds on the capacity can be considered when these improvements are used in a MIMO system.
    • ¿Y ahora?... ¿Cómo puedo mejorar el rendimiento académico de los alumnos?

      Mónica Illalí, Ortiz (Tecnológico de Monterrey, 30/11/2010)
    • “El Uso de TIC’s, ¿valor agregado o competencia fundamental en el nuevo modelo educativo?”

      López Benítez, Enrique B. (Tecnológico de Monterrey, 30/11/2010)
    • Desarrollo de un Elemento Finito Placa Basado en una Forma Especial de Representación de Solución

      Pineda Herández, Guillermo (Instituto Tecnológico y de Estudios Superiores de Monterrey, 30/07/2004)
      En el presente trabajo se desarrolla un nuevo elemento rectangular para placas delgadas basado en la teoría de Kirchhoff. Dicho elemento es compatible y tiene 12 grados de libertad. Las deflexiones y rotaciones dentro del elemento y en sus bordes se definen por medio una modificación de polinomios de Hermite. Las modificaciones se realizan por el uso de restricciones sobre sus segundas derivadas. Para comprobar las características del elemento se resuelven algunos problemas clásicos en la teoría de placas como son: 1. Placa rectangular sometido a una carga uniformemente distribuida con 4 lados empotrados. 2. Placa rectangular sometido a una carga uniformemente distribuida, simplemente apoyada. 3. Placa rectangular sometido a una carga uniformemente distribuida con 2 lados empotrados y 2 lados simplemente apoyados. 4. Placa simplemente apoyada, sometido a un momento distribuido en 2 de sus lados. 5. Placa empotrada en uno de sus lados (cantilliver), sometido a un momento distribuido en el otro extremo, donde a > b relación 10/1. 6. Placa empotrada en uno de sus lados (cantillever), sometido a una fuerza distribuida en el otro extremo, donde a > b relación 10/1. 7. Placa empotrada en uno de sus lados (cantillever), sometido a una fuerza distribuida en el otro extremo, donde a > b relación 2/1. Para los primeros 4 casos se utiliza una placa rectangular con distintos tamaños de malla, para estos ejemplos se utiliza simetría. En los otros 3 casos restantes se muestran el comportamiento con un arreglo del elemento definido por las dimensiones a que es el largo de elemento y b como el ancho. Con estos ejemplos se obtiene: una gráfica de error contra densidad de malla, velocidad de convergencia del error relativo con respecto a los grados de libertad utilizados, y la representación gráfica de la deflexión, momentos y cortantes. Finalmente se realiza una comparación con otros elementos placa desarrollados, debido a que es necesario comprobar el comportamiento del elemento con resultados obtenidos con respecto a otras formulaciones, esta comparación sirve como parámetro de validación del trabajo hecho.
    • La repercusión de decir "negrita te té"

      Ochoa, Leticia (Tecnológico de Monterrey, 30/05/2013)
    • Cambio de país: caso y notas de enseñanza.

      Hernádez López, J. Guadalupe (Tecnológico de Monterrey, 30/05/2013)
    • "Colancho" y el bullying

      Cid, Adrián (Tecnológico de Monterrey, 30/05/2013)
    • "La Conducta Agresiva de Javier"

      González, Teresita (Tecnológico de Monterrey, 30/05/2013)
    • Raúl, un caso de agresión

      Martínez Garnica, Laura X. (Tecnológico de Monterrey, 30/05/2013)
    • Caso: ¡Soy hiperactivo! Por eso soy agresivo

      Loza Galarza, Atenea (Tecnológico de Monterrey, 30/05/2013)
    • Protein adsorption through Chitosan–Alginate membranes for potential applications

      Murguía Flores, Dennise A.; Bonilla Ríos, Jaime; Canales Fiscal, Martha R.; Sánchez Fernández, Antonio; Tecnologico de Monterrey (Springer Open, 30/04/2016)
      Abstract Background Chitosan and Alginate were used as biopolymers to prepare membranes for protein adsorption. The network requires a cross-linker able to form bridges between polymeric chains. Viscopearl-mini® (VM) was used as a support to synthesize them. Six different types of membranes were prepared using the main compounds of the matrix: VM, Chitosan of low and medium molecular weight, and Alginate. Results Experiments were carried out to analyze the interactions within the matrix and improvements were found against porous cellulose beads. SEM characterization showed dispersion in the compounds. According to TGA, thermal behaviour remains similar for all compounds. Mechanical tests demonstrate the modulus of the composites increases for all samples, with major impact on materials containing VM. The adsorption capacity results showed that with the removal of globular protein, as the adsorbed amount increased, the adsorption percentage of Myoglobin from Horse Heart (MHH) decreased. Molecular electrostatic potential studies of Chitosan–Alginate have been performed by density functional theory (DFT) and ONIOM calculations (Our own N-layered integrated molecular orbital and molecular mechanics) which model large molecules by defining two or three layers within the structure that are treated at different levels of accuracy, at B3LYP/6-31G(d) and PM6/6-31G(d) level of theory, using PCM (polarizable continuum model) solvation model. Conclusions Finally, Viscopearl-mini® acts as a suitable support on the matrix for the synthesis of Chitosan–Alginate membranes instead of cross-linkers usage. Therefore, it suggests that it is a promise material for potential applications, such as: biomedical, wastewater treatment, among others. Graphical abstract Chitosan, Alginate, and Cellulose beads-based membranes for protein adsorption. Special attention was given for preparation, charaterization, adsorption capacity, and molecular electrostatic potential studies calculation. Viscopearl-mini® gives support on the matrix of Chitosan–Alginate membranes instead of cross-linkers usage