Is Learning Really a Phone Call Away? Knowledge Transfer in Mobile Learning

Mobile learning can positively contribute to the development of learning communities by providing communication options that span contexts and locations, are available whenever, and are used virtually everywhere (Alexander, 2004; Sharples, Taylor & Vavoula, 2005). At UC Santa Barbara, we are currently conducting a campus-wide study that examines whether students’ use of technology, both within and beyond the classroom, correlates with academic performance. While we primarily concentrate on the use of course websites accessed with non-mobile devices, we have begun to use a Performance-Based Feedback System (PBFS) to explore (1) how to extend the instructor-student feedback loop beyond the traditional classroom setting, (2) how knowledge transfer can be accomplished using mobile devices, and (3) what technical challenges must be overcome. In this paper, we examine ways that mobile networking technologies can foster the creation of learning communities and provide new methods for studying knowledge transfer.University of California, Santa Barbar

10403 Abstracts Collection -- Impact of Human Mobility on Communications : Measurement, Analysis, Modeling, and Simulation

From 06.10.2010 to 09.10.2010, the Dagstuhl Seminar 10403 ``Impact of Human Mobility on Communications : Measurement, Analysis, Modeling, and Simulation\u27\u27 was held in Schloss Dagstuhl~--~Leibniz Center for Informatics. During the seminar, several participants presented their current research, and ongoing work and open problems were discussed. Abstracts of the presentations given during the seminar as well as abstracts of seminar results and ideas are put together in this paper. The first section describes the seminar topics and goals in general. Links to extended abstracts or full papers are provided, if available

Wired wireless broadcast emulation

Abstract-A wired testbed's usefulness for wireless re search hinges on its ability to faithfully reproduce the wireless medium. One of the key properties of a wireless medium is its broadcast nature. Wireless broadcast behav ior is used in applications such as cell phone and satellite networks to disseminate the same data to multiple users as well as perform time synchronization. In this paper, we investigate two methods that can be used to ascertain if a given wireless emulator is modeling the broadcast property correctly. Our results indicate that the better of the two proposed methods offers micro-second precision. I

Support for efficient, scalable delivery of interactive multimedia services

Ph.D.Mostafa H. Amma

Coupons: Wide Scale Information Distribution for Wireless Ad Hoc Networks

Abstract — Integrating ad hoc networks into the Internet requires overcoming a number of difficult technical challenges. In particular, ad hoc networks must not only overcome intermittent connectivity, but they also need a strong incentive mechanism to encourage users to participate in the cooperative relay of data traffic. We believe that inherent in solving these problems is the development of new applications that might, in fact, be more easily deployed in an ad hoc environment than in a traditional fixed network infrastructure. To this end, we develop and evaluate the idea of “coupons ” for wide-scale information distribution in ad hoc networks. “Coupons ” provides a simple incentive to nodes for relaying a piece of information. By using mechanisms on top of basic flooding to efficiently control distribution, it provides an elegant solution for scalable data dissemination with reduced network costs. I

A Long-Term Analysis of Growth and Usage Patterns in the Multicast Backbone (MBone)

The Multicast Backbone (MBone), the Internet's multicast research infrastructure, has existed since the early 1990s. Since its inception, there have been few formal studies investigating the "state of multicast", i.e. the success of multicast deployment. Our work attempts to understand (1) how the MBone is used, (2) how multicast deployment has progressed, and (3) what barriers exist for the continued deployment of multicast. Future research and deployment efforts would benefit significantly with answers to these macro-scale questions. Our work is based on data sets collected over a 4.5 year period. These data sets include join/leave statistics for many of the MBone sessions advertised through the MBone's session directory tool. Using this data, we examine characteristics about the number and frequency of multicast groups and about the users participating in these groups. In addition, we attempt to qualify the accuracy of our results by examining other sources of multicast traffic stat..