Control de acceso mediante tarjeta chip: Aplicaciones de Control a través de Internet

Versión electrónica de la ponencia presentada en V Congreso de Tecnologías Aplicadas a la Enseñanza de la Electrónica, celebrado en Gran Canaria en 2002En este artículo se presenta un sistema real de control de accesos desarrollado por alumnos de nuestra Escuela. Este proyecto ha servido de plataforma para desarrollar los conocimientos no sólo de sistemas embebidos basados en microcontrolador, sino también para practicar las comunicaciones TCP/IP y el desarrollo de la base de datos de usuarios y su software de gestión

GP_BOT: plataforma hardware para la enseñanza de robótica en la titulación de ingeniería informática.

Versión electrónica de la ponencia presentada en V Congreso de Tecnologías Aplicadas a la Enseñanza de la Electrónica, celebrado en Las Palmas de Gran Canaria en 2002En este artículo se resumen las principales características de unas tarjetas basadas en el microcontrolador MC68HC908GP32 de Motorola, que se utilizan en el Laboratorio de la asignatura Robótica Autónoma en la carrera de Ingeniería Informática de la Universidad Autónoma de Madrid

Endoscopic Ultrasound-Guided Application of a Cryotherm\uae Probe in the Pancreas : Results in an Animal Model

Context The development of linear array therapeutic probes with a large working channel (3.8 mm) has made endoscopic ultrasound (EUS) more operative. Objective The aims of the study were to evaluate feasibility, efficacy, and safety of EUS-guided transgastric application of a new cryotherm probe (CTP) in the pancreas of an animal model, as well as to objectify risks, complications and histological changes. Methods A new hybrid ablative device that combines radiofrequency (RF)-ablation with cryotechnology has been developed by ERBE. The cryotechnology has been used to support and increase the killing effect of the RF-technology. A Hitachi ultrasonographic system and a linear array Pentax EG3830UT echoendoscope were used. The CTP was applied under EUS guidance in 19 domestic pigs. The animals were killed immediately (n=1), one week (n=10), two weeks (n=7) and 4 weeks (n=1) after ablation. Pathologic examination was performed. Results All pigs tolerated the procedure well. Correlation between EUS and gross pathology showed a correlation coefficient of 0.69. Excluding an animal with severe pancreatitis, the correlation coefficient was 0.87. The ablation area was correlated to the application time and measured by means of the robust regression: it showed a fitted ratio of 2.294 (P<0.001), in the pancreases of the animals killed after one week, 2.709 in the pig immediately killed (P<0.001) and 0.209 in the animals killed after 2 weeks (P<0.001). Three animals presented a burning of the gastric wall, one developed a fistula between the cystic lesion and the gut, two had acute pancreatitis. Conclusion This is the first device which combines radiofrequency and cryotechnology to create selective necrosis. We demonstrated the feasibility, efficacy and safety of its EUS-guided application in the pancreas in a porcine model

Endoscopic ultrasound-guided application of a new internally gas-cooled radiofrequency ablation probe in the liver and spleen of an animal model : a preliminary study

BACKGROUND AND STUDY AIMS: In a previous study, a new flexible bipolar hybrid cryotherm probe was applied with success to the pancreas of a living pig. Here we evaluated feasibility, efficacy, and safety of its application to the porcine liver and spleen. MATERIAL AND METHODS: Ten applications to the liver and nine to the spleen were performed in 19 pigs. Power input (16-18 W) and simultaneous cooling with CO(2) (standardized pressure: 675 psi) as the cryogenic agent were investigated. Application time varied from 120 seconds to 900 seconds. The ablation area was measured by endoscopic ultrasound (EUS) after ablation (T0), and before euthanasia (T1). Gross pathology (T2) and histology after necropsy represented the gold standard. The interval from treatment to euthanasia was 1 or 2 weeks. RESULTS: For both organs the correlation between EUS and gross pathology was good (correlation coefficient R(liver) = 0.71; R(spleen) = 0.73). EUS tended to overestimate the area of the ablated zone. EUS observed a time-dependent ablation area: we demonstrated a positive trend of lesion size (T1) over time in liver tissue (R = 0.51 (P = 0.1)). In the spleen we found a clear correlation of lesion area T2 and application time (R = 0.75, P = 0.01). There were no complications. CONCLUSIONS: Selective EUS-guided transgastric cryotherm ablation of the liver and spleen in a pig model is feasible and safe. The new bipolar probe creates a time-dependent ablation area without any complications, and opens a field of new potential indications of RF-ablative therapies