Tekhné

10

Authors: Dangilbert Xavier Roche Tovar, María Fernanda Vera Lepage, María Gabriela Rodríguez Barreto

Diabetes Mellitus is a chronic disease that affects over 366 million people around the world. One of its most common complications is the Cardiovascular Autonomic Neuropathy, causing damage on the Autonomous Nervous System (ANS), responsible of the cardiovascular control and the respiratory dynamics. The ANS deterioration can be evaluated from analyzing signals like the Variability of the Cardiac Frequency (VCF) and the Variability of the QT Interval (VQT), time sequences obtained from an Electrocardiogram (ECG). This work uses ECG stress tests (ST) of 5 stages under the modified Bruce Protocol (1.-idle, 2.-Moderate effort, 3.-Maximum effort, 4.-Early Recovery, 5.-Recovery), applied to diabetic subjects with cardiac complications (DG) and healthy ones (CG). Two methods were proposed for ANS evaluation: (i) on the frequency spectrum, The Hilbert-Huang Transform (HHT) and the Autoregressive Model (AR) in short 150 sample segments, where energy was measured using frequency bands. (ii) Time analysis used the Bernaola- Galvan algorithm in order to get the Stationary Segments (SS), the results from this analysis on both the VCF and VQT shows us that many SS could be found as well as none in some of the signals. Also when performing a statistical analysis was found that the number of SS found and the length was greater for the DG than the CG, this is due to the damage caused by the diabetes over the ANS nerves.

16

Authors: María de los Ángeles Altuve D., Carlos Luis Vollmer D.

This research intendes to suggest improvements for processes of patient attention in a Charity Hospital, providing solutions for reducing the time that spend the patients since enter the center until they pay the required service. In this research the processes of interest were characterized and analyzed through direct nonparticipatory observation and interviews to personnel involved in these processes in order to recreate the current situation and to identify the main problems that affect the quality of service using a process simulation program (Rockwell Arena ®). The results obtained were as follow: improvement of the patient flow within the center, reduction of the distance traveled in 28,0%; improvement the distribution of payment lines in order to improve people flow; improvement the means of signs and information to simplify flow and easily identify the location of services and finally, a reduction of the average time in system for billing processes of medical visit services by 13,0% and imaging services by 74,0% with respect to the current situation.

18

Authors: Juan José Sandoval L., Luis Amado Gutiérrez Larrisgoitia

El problema de gestionar inventario es uno de los más importantes para las empresas. Una empresa que gestiona de forma adecuada su inventario minimiza los costos de operación mientras es capaz de cumplir con las necesidades de demanda de sus clientes, generando valor a través de la cadena de suministro. En este trabajo, se describen las características resaltantes y la situación actual de los sistemas de inventario de comercializadoras en Venezuela. Posteriormente se construye un modelo que integra las características de estos sistemas y las necesidades frecuentes de los gerentes. El modelo del sistema se integra en una herramienta computarizada que propone buenas políticas de inventario y permite estudiar el impacto de cualquier política mediante si­mulaciones rápidas pero realistas. La herramienta está orientada principalmente a los análisis de sensibilidad del sistema ante cambios en los costos, las restricciones, el tiempo de caducidad y la variabilidad de la demanda y las demoras. Esto constituye un aspecto importante dado que las empresas de hoy en día se encuentran en un entorno de constante transformación. El objetivo final de esta herramienta es reducir los costos de operación de inventarios mientras se asegura un buen servicio a los clientes, así como probar los planes de inventarios antes de llevarlos a la realidad.