In this paper we focus on the application of reinforcement learning to obstacle avoidance in dynamic Environments in wireless sensor networks. A distributed algorithm based on reinforcement learning is developed for sensor networks to guide mobile robot through the dynamic obstacles. The sensor network models the danger of the area under coverage as obstacles, and has the property of adoption o...

the main purpose of this paper has been to predict english students’ academic achievement on the basis of achievement goals, motivational –usefulness beliefs and the kind of mobile usages. the population of the study consisted of english language students in the faculty of foreign language at isfahan university from both undergraduate and graduate levels in 2011-2012. by applying a random sampl...

the computer industry has defined the ieee 802.16 family of standards that will enable mobile devices to access a broadband network as an alternative to digital subscriber line technology. as the mobile devices join and leave a network, security measures must be taken to ensure the safety of the network against unauthorized usage by encryption and group key management. ieee 802.16e uses multica...

The integration of wireless local area network and wireless mobile devices allows to implement a complete information system able to support everyday activities unobtrusively and seamlessly as the ubiquitous computing paradigm says. Wireless mobile ad hoc networking could be successfully used in the construction of flexible and adaptive information system with no fixed infrastructure and it all...

Predictive schemes are current standards of video coding. Unfortunately they do not apply well for lightweight devices such as mobile phones. The high encoding complexity is the bottleneck of the Quality of Experience (QoE) of a video conversation between mobile phones. A considerable amount of research has been conducted towards tackling that bottleneck. Most of the schemes use the so-called W...

This paper describes a systematic and multidisciplinary approach to developing evidence-based standards and guidelines of user interface design for mobile survey instruments. The approach includes five major components: project team, systematic literature review, mobile user model, standards development, and guidelines development. A multidisciplinary project team was assembled to ensure adequa...

The new generation of mobile communications, characterized by the ubiquity of the services and the heterogeneity of the technologies, has new needs: it shows the deficiencies of the present standards in several aspects and arise others that cover the new requirements. In this work, on the one hand, the deficiencies in security aspects of the current standards, and on the other hand, two new wor...