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Acoustic metrics extracted from speech have the potential to serve as novel biomarkers for a variety of neurological and neurodevelopmental conditions, as is evidenced by the rapidly growing corpus of research articles studying the links between brain impairments and speech. In this paper, we discuss the advantages and the disadvantages of speech biomarkers and the various challenges in the design...
In this paper, a novel transmit power control protocol for vehicular ad-hoc networks (VANETs) is proposed that aims to improve the reliability of safety-critical broadcasts while also maximizing the transmission range. Large transmission ranges are often desirable in order to ensure that safety-critical messages reach as many vehicles as possible, particularly in highvelocity situations. However,...
Wireless mesh networks are increasingly used as multipurpose networks, i.e., they serve multiple objectives and different applications simultaneously. As a consequence, a one-size-fits-all routing solution is difficult to achieve, particularly when the performance and QoS expectations of these applications differ. This work proposes CMR (Configurable Mesh Routing), a toolkit that supports the discovery...
Exclusive access to the wireless medium, e.g., as provided by bandwidth-reservation mechanisms, limits contention and therefore is capable of providing effective real-time support to periodic communications. Furthermore, to preserve energy, wireless cards can be powered down between periodic accesses without loss of data. However, packet schedulers must be aware of the limited communication opportunities...
The demand for rich multimedia content is continuously increasing as exemplified by the success of sites such as YouTube, Google Video, and others. Critically, the richness of multimedia content places significant demands on the limited bandwidth available in wireless networks. To that end, this paper proposes a novel mechanism, opportunistic wireless broadcast (OWB), that opportunistically aggregates...
Maintaining synchronization of clocks between wireless systems is a well known problem of which significant research has been performed. This has lead to a variety of methods introduced to maintain clock synchronization. Typically, works are heavy weight in that they require constant communication between systems in order to maintain clock synchronization on the order of microseconds. Unfortunately,...
Re-tasking and remote programming of sensor networks is an essential functionality to make these networks practical and effective. As the availability of more capable sensor nodes increases and new functional implementations continue to be proposed, these large collections of wireless nodes will need the ability to update and upgrade the software packages they are running. Standard flooding mechanisms...
Even though their capacities are still orders of magnitude lower than those of hard disks, flash storage systems are rapidly gaining importance in energy-constrained systems. This paper focuses on USB flash drives, which can provide portable storage to mobile systems or storage to systems that otherwise do not have persistent storage opportunities (e.g., low-power sensor devices). The paper presents...
Wireless enabled devices are ubiquitous in todaypsilas computing environment. Businesses, universities, and home users alike are taking advantage of the easy deployment of wireless devices to provide network connectivity without the expense associated with wired connections. Unfortunately, the wireless medium is inherently unreliable resulting in significant work having been performed to better understand...
To better prepare undergraduate students for graduate school and careers as computer scientists, we have undertaken an effort to increase both expertise and interest in research through a novel course format. The course weaves an active research project in mobile computing with a senior class on distributed systems. To facilitate the instruction, we use a mobile computing platform, TeamTrak, which...
Streaming real-time applications require the timely distribution of information in mobile ad-hoc and sensor networks. At the same time, such networks must operate energy-efficiently to maximize the lifetime of mobile devices and applications. In multi-hop networks, multiple communication paths between a single sender and receiver can be established, with varying real-time and energy characteristics...
Previous work on routing in MANETs has resulted in numerous routing protocols that aim at satisfying constraints such as minimum hop or low energy. Existing routing protocols often fail to discover stable routes between source and sink when route availability is transient, i.e., due to mobile devices switching their network cards into low-power sleep modes whenever no communication is taking place...
This work is based on the observation that existing energy management techniques for mobile devices, such as dynamic voltage scaling (DVS), are non-cooperative in the sense that they reduce the energy consumption of a single device, disregarding potential consequences for other constraints (e.g., end-to- end deadlines) and/or other devices (e.g., energy consumption on neighboring devices). This paper...
Much research in mobile networks relies on the use of simulations for evaluation purposes. While a number of powerful simulation tools have been developed for this purpose, only recently has the need for physical implementations of mobile systems and applications been widely accepted in the literature. In recognition of this need, and to further our research objectives in the area of wireless sensor...
Wireless environments are typically characterized by unpredictable and unreliable channel conditions. In such environments, fragmentation of network-bound data is a commonly adapted technique to improve the probability of successful data transmissions and reduce the energy overheads incurred due to re-transmissions. The overall latencies involved with fragmentation and consequent re-assembly of fragments...
Reducing energy consumption is an important consideration in embedded real-time system development. This work examines systems that contain a DVFS managed CPU executing packet producing tasks and a DPM-controlled network interface. We introduce a novel approach to minimize energy consumed by the network resource on such a system, through careful selection of voltage and frequency levels on the CPU...
We have observed anecdotally that many beginning graduate students, while technically skilled, are deficient in the ability to communicate technical ideas orally and in writing. To address this, we have developed a literate approach to graduate education. This approach has two components: reflection on a series of technical readings appropriate to a course, and a highly literate course project where...
Dynamic voltage scaling (DVS) is a frequently used technique in mobile and embedded systems, aimed at reducing the energy consumption of mobile processors. In systems with a discrete number of frequency levels, existing dual-speed DVS approaches compute an optimal theoretical CPU speed and approximate it by choosing the two neighboring discrete speed levels. By comparing experimentally the energy...
We have observed that many beginning graduate students, though technically skilled, are lacking the ability to disseminate technical knowledge to a broad audience. Students often write term papers that describe the intricate complexity of their work, but fail to place the work in context, to articulate the core argument, or to present the proper level of detail. In response, we are developing a curriculum-independent...
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