Despite the extraordinary advances in global navigation satellite systems (GNSS), the inherent limitation of the weakness of their space-based signals makes such signals easy to block intentionally or accidentally. This makes GNSS insufficient for reliable anytime, anywhere navigation, particularly in GNSS-challenged environments, such as indoors, deep urban canyons, and GNSS-denied environment...

This work describes mechanisms for simulating opportunistic and delay-tolerant networks in the OMNeT++ discrete event simulator. The mechanisms allow for simulating open systems of wireless mobile nodes where mobilityor contact traces are used to drive the simulations. This way mobility generation is separated from the core OMNeT++ protocol simulations which facilitates importing synthetic or r...

In this paper we discuss about how to increase the reliability, energy-efficiency in a wireless sensor network. Since energy saving has become the top factor on demand due to the increasing multimedia services in mobile devices. The existing batteries unfortunately do not provide the desirable lifetime. Therefore reducing energy consumption has become very crucial factor in all the tasks the mo...

This paper presents an extension of the Motivated Learning model that includes environment masking, and opportunistic behavior of the motivated learning agent. Environment masking improves an agent’s ability to learn by helping to filter out distractions, and the addition of a more complex environment increases the simulation’s realism. If conditions call for it opportunistic behavior allows an...

Opportunistic networks constitute an appealing solution to complement fixed network infrastructures –or make up for the lack thereof– in challenged areas. Although many papers published in the last few years address the problem of supporting message dissemination in opportunistic networks, very little of them consider the problem of designing distributed applications capable of running in such ...

Opportunistic Networks are pure wireless networks in which no direct communication is present between nodes In OPPNET no base station is used for further communication. Data transmission takes place through intermediate nodes. These intermediate nodes uses store-carry-forward model for data transmission. In opportunistic network numbers of routing protocols are presented. Routing protocols are ...

This work is aimed at ascertaining the impact of an opportunistic disease outbreak in a population already affected by a primary disease. Our main assumption is that the primary disease weak the host organism allowing the invasion of the opportunistic disease. We are interested in possible synergistic effects and we found that the fate of the primary disease epidemic process may change drastica...

Med J Malaysia Vol 66 No 1 March 2011 SUMMARY Opportunistic pneumonias are major causes of morbidity and mortality in HIV infected individuals. The majority of new HIV infections in Malaysia are adults aged 20 to 39 years old and many are unaware of their HIV status until they present with an opportunistic infection. HIV associated opportunistic pneumonias can progress rapidly without appropria...

AIM To assess the potential for administering catch up and scheduled immunisations during hospital admission. METHODS Immunisation status according to the child's principal carer was checked against official records for 1000 consecutively admitted preschool age children. Junior doctors were instructed to offer appropriate vaccination before discharge, and consultants were asked to reinforce t...

Motivation. With the increasing integration of wireless short-range communication technologies (Bluetooth, 802.11b WiFi) into mobile devices, novel applications for spontaneous communication, interaction and collaboration are possible. We distinguish between active and passive collaboration. The devices help users become aware of each other and stimulate face-to-face conversation (active collab...