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Guarding against channel errors in wireless networks has been a challenging research problem, specially when transmitting time-constrained contents, like streaming video or image. Multiple description coding (MDC) is an effective means to combat bursty packet losses over wireless channels, and it is especially promising for the applications where retransmission is unacceptable. In MDC, a frame is...
We investigate the strength of patterns as secret signatures in Android's pattern based authentication mechanism. Parallelism of GPU is exploited to exhaustively search for the secret pattern. Typically, searching for a pattern, composed of a number of nodes and edges, requires an exhaustive search for the pattern. In this work, we show that the use of GPU can speed up the graph search, hence the...
Advancement in mobile technology, coupled with a market wide growth in mobile subscriber base, is encouraging financial, telecom and even third party operators to offer mobile payment services. In presence of a plethora of such services, an imminent problem is lack of interoperability across them. In this work, we address the challenge of interoperability by designing a wallet service built upon a...
With the growing number of cities and population, continuous monitoring of city's infrastructure and automated collection of day-to-day events (such as traffic jam) is essential and can help in improving life style of citizens. It is extremely costly and ineffective to install hardware sensors to sense these events in developing regions. Due to advent of smartphones, citizens can play role of sensors...
In Software-as-a-Service (SaaS) cloud delivery model, a hosting center deploys a Virtual Machine (VM) image template on a server on demand. Image templates are usually maintained in a central repository. With geographically dispersed hosting centers, time to transfer a large, often GigaByte sized, template file from the repository faces high latency due to low Internet bandwidth. An architecture that...
Streaming video applications are gaining popularity over not only the fixed Internet but also mobile hand-held devices. Growth in wireless access technologies along with the advanced coding schemes show the promise of better streaming video service for the mobile users. However, wireless channels are characterized by fluctuating bandwidth, thereby making it challenging for streaming applications to...
Provisioning a virtual server instance in cloud goes through an elaborate workflow, characterized by user request submission, search for the requested image template in image repository, transfer of the template file to compute hosts, followed by expansion and boot up. Optimizing any step in this workflow is crucial in reducing the service time. In this work, we focus on reducing average service time...
Maintaining consistent views of components in complex IT environments is challenging due to frequent changes applied to the systems. Discovery tools, typically used for scanning the environment, can fail to gather up-to-date information. We present a technique to track changes by monitoring system events induced by a change. The system events are associated to entities in a configuration model. A...
With the growing use of virtual servers for hosting applications, management of large IT infrastructure faces new challenges. In order to reduce the capital expenditure at data centers, virtual server consolidation approaches has been the focus of attention. However, server consolidation inadvertently introduces a new point of failure, which is the physical resource on which the virtual machines are...
Guarding against channel errors in wireless networks has been a challenging research problem, specially when transmitting time-constrained contents, like streaming video or image. Source diversity in the form of Multiple Description Coding (MDC) has been studied for guarding against wireless channel errors. In MDC, an image is broken into several equally important descriptions which can be sent over...
Use of a single wireless network interface on a device had been the standard practice for a long time due to hardware limitations. Designing a multi-hop ad hoc network with single NIC devices suffers from low bandwidth utilization due to co-channel interference. Recent advances in wireless device technology are spurring the emergence of several end user devices with multiple radios on them. Wireless...
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