Chemistry students have difficulty understanding molecular structures and their functions. To aide their comprehension, molecular visualization software has been developed to run on smart phones, but in order to positively influence learning it must have a high degree of usability (usability measures how software is used in terms of efficiency, efficacy and satisfaction). This paper describes a usability study of molecular visualization software running on a smart phone, where chemistry students analyzed molecular models. Results showed very good usability and 95% of students wanted to use it in further classes.

This paper presents a wireless communication protocol based on the Earliest Deadline First policy for wireless body sensor networks. This work advances a previous effort by proposing using an implicit Earliest Deadline First policy to guarantee real-time communication by optimizing network traffic flow, although this strategy may imply using the totality of bandwidth resources. The proposed protocol uses a slotted time-triggered medium access transmission control that is collision-free, even in the presence of hidden nodes. The protocol has been analytically modeled using Colored Petri Networks and Simulated in OPNET.

Este trabajo presenta un protocolo de comunicación inalámbrica basado en una política de "El más próximo tiempo de expiración primero" para redes de sensores corporales inalámbricas. El presente, mejora un esfuerzo previo proponiendo el uso de una política del más próximo tiempo de expiración primero implícito (Implicit EDF) para garantizar comunicación en tiempo real a través de la optimación del flujo de tráfico en la red, aunque esta estrategia podría implicar usar la totalidad de los recursos de ancho de banda. El protocolo propuesto utiliza un control de transmisión de acceso al medio con ranuras de tiempo, que son libres de colisiones, aún en la presencia de nodos escondidos. El protocolo ha sido analíticamente modelado a través de redes de Petri coloreadas y simulado en OPNET.