11,373 research outputs found
The 3DMA Middleware for Mobile Applications
Mobile devices have received much research interest in re- cent years. Mobility raises new issues such as more dynamic context, limited computing resources, and frequent disconnections. To handle these issues, we propose a middleware, called 3DMA, which introduces three requirements, 1) distribution, 2) decoupling and 3) decomposition. 3DMA uses a space based middleware approach combined with a set of workers which are able to act on the users behalf either to reduce load on the mobile device, or to support disconnected behavior. In order to demonstrate aspects of the middleware architecture we consider the development of a commonly used mobile application
Time4: Time for SDN
With the rise of Software Defined Networks (SDN), there is growing interest
in dynamic and centralized traffic engineering, where decisions about
forwarding paths are taken dynamically from a network-wide perspective.
Frequent path reconfiguration can significantly improve the network
performance, but should be handled with care, so as to minimize disruptions
that may occur during network updates.
In this paper we introduce Time4, an approach that uses accurate time to
coordinate network updates. Time4 is a powerful tool in softwarized
environments, that can be used for various network update scenarios.
Specifically, we characterize a set of update scenarios called flow swaps, for
which Time4 is the optimal update approach, yielding less packet loss than
existing update approaches. We define the lossless flow allocation problem, and
formally show that in environments with frequent path allocation, scenarios
that require simultaneous changes at multiple network devices are inevitable.
We present the design, implementation, and evaluation of a Time4-enabled
OpenFlow prototype. The prototype is publicly available as open source. Our
work includes an extension to the OpenFlow protocol that has been adopted by
the Open Networking Foundation (ONF), and is now included in OpenFlow 1.5. Our
experimental results show the significant advantages of Time4 compared to other
network update approaches, and demonstrate an SDN use case that is infeasible
without Time4.Comment: This report is an extended version of "Software Defined Networks:
It's About Time", which was accepted to IEEE INFOCOM 2016. A preliminary
version of this report was published in arXiv in May, 201
DEMO: Attaching InternalBlue to the Proprietary macOS IOBluetooth Framework
In this demo, we provide an overview of the macOS Bluetooth stack internals
and gain access to undocumented low-level interfaces. We leverage this
knowledge to add macOS support to the InternalBlue firmware modification and
wireless experimentation framework.Comment: 13th ACM Conference on Security and Privacy in Wireless and Mobile
Network
Stickers for steps: a study of an activity tracking system with face-to-face social engagement
Many systems have been designed to study social aspects in physical activity tracking. In most, social functions are performed at a distance, such as posting comments and achievements, or via in-app leaderboards. We present an activity tracking app designed instead to encourage face-to-face encounters. Stickers for Steps seeks to recreate the experience of a physical sticker book, where digital 'stickers' are collected in an album, but where stickers are awarded for reaching activity targets. Users will accrue duplicate stickers, which can be swapped with other co-located users over a Bluetooth connection. We explore the usage of our app, reporting on a trial with 33 participants. We find that our app successfully encouraged groups of users to swap duplicates, review progress and to discuss their levels of activity. We provide design recommendations for future activity tracking systems that could incorporate face-to-face interactions
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