We consider a time slotted cognitive radio (CR) network under Rayleigh fading where multiple secondary users (SUs) contend for spectrum usage over available primary users channels. In the contention, all SUs use common access probabilities to decide whether they access one of available channels. We focus on the throughput performance of an arbitrary SU. To improve the throughput performance of ...

In cognitive radio networks (CRN), Out-of-Band (OoB) spectrum sensing provides seamless communication. Cognitive radio (CR) users, so called secondary users (SUs), should avoid interference with primary users (PUs), the owner of the licensed band, while trying to access the unused licensed or unlicensed band, for spectrum utilization. When PUs request to access their band, SUs need to vacate th...

A combination of genetic factors and early life events is thought to determine the vulnerability of an individual to develop a complex neurodevelopmental disorder like schizophrenia. Pharmacogenetically selected, apomorphine-susceptible Wistar rats (APO-SUS) display a number of behavioral and pathophysiological features reminiscent of such disorders. Here, we report microarray analyses revealin...

We revisit the exact shortest unique substring (SUS) finding problem, and propose its approximate version where mismatches are allowed, due to its applications in subfields such as computational biology. We design a generic in-place framework that fits to solve both the exact and approximate k-mismatch SUS finding, using the minimum 2n memory words plus n bytes space, where n is the input strin...

Man and animals are frequently coming into conflicts over habitat and food requirements and this is mainly due to expanding human population and loss of natural habitats. The problem has been identified as major challenge to the governments of many countries and is significant to many human communities. Forest villages are the most potent sites for this problem as these are the places where hum...

Resumen. La planificación de viajes está dominada actualmente por los recursos en línea, tales como agencias de viajes, sitios web de opiniones de viaje y hoteles, redes sociales, entre otros. Cuando se ha decidido el lugar a visitar, el siguiente paso es buscar dónde hospedarse y dado que el primer medio de búsqueda es el Internet, no hay mejor oportunidad para los hoteles que incluir un motor...

Resumen. En este artículo, se presenta un análisis de las organizaciones desarrolladoras de software que a nivel mundial han sido evaluadas de acuerdo al modelo CMMI, en el apartado de CMMI-Dev en su versión 1.3 en los años 2013 y 2014. Este trabajo da como resultado el ranking mundial por país en cuanto a certificaciones en CMMI-DEV ver. 1.3 en sus cinco niveles de madurez, lo que refleja el i...

Resumen El éxito de un proyecto de implementación de software depende de un buen proceso de levantamiento de requerimientos y un buen entendimiento del negocio, para lograrlo, todos los interesados en el proyecto deben ver reflejadas sus necesidades e intenciones en el producto terminado, para ello se requiere la utilización de modelos entendibles y estandarizados. La notación de modelo de proc...

BACKGROUND Expenses with coronary artery bypass grafting (CABG) surgery and coronary angioplasty (CA) represented a significant cost to SUS. OBJECTIVE To analyze SUS expenses with CABG and CA and their performance in hospitals in the state of Rio de Janeiro (SRJ), from 1999 to 2008. METHODS The information came from paid HAA in hospitals with more than 100 revascularization procedures. Mort...