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Wireless Rechargeable Sensor Networks (WRSNs) can be recharged after deployment for sustainable operations. Recent works propose to use a single mobile charger (MC) traveling through the network fields to recharge every sensor node. These algorithms work well in small scale networks. However, in large scale networks these algorithms do not work efficiently,(More)
We present a file reordering method to improve runtime I/O efficiency for out-of-core streamline computation. Because of the increasing discrepancy between the speed of computation and that of I/O on multi-core machines, the cost of I/O becomes a major bottleneck for out-of-core computation. Among techniques that reduce runtime I/O cost, reordering file(More)
While there have been intensive efforts in developing better 3D flow visualization techniques, little attention has been paid to the design of better user interfaces and more effective data exploration work flow. In this paper, we propose a novel graph-based user interface called Flow Web to enable more systematic explorations of 3D flow data. The Flow Web(More)
The process of visualization can be seen as a visual communication channel where the input to the channel is the raw data, and the output is the result of a visualization algorithm. From this point of view, we can evaluate the effectiveness of visualization by measuring how much information in the original data is being communicated through the visual(More)
Existing scheduling schemes for stochastic event capture with rechargeable sensors either adopt simplified assumptions on event staying time or provide no performance guarantee. Considering the stochasticity of event staying time, we investigate the sensor scheduling problem aiming to maximize the overall Quality of Monitoring (QoM) in events capture(More)
One fundamental question in Wireless Rechargeable Sensor Networks (WRSNs) is the energy provisioning problem, i.e., how to deploy energy sources in a network to ensure that the nodes can harvest sufficient energy for continuous operation. Though the potential mobility of nodes has been exploited to reduce the number of sources necessary in energy(More)
—For low-duty-cycle wireless sensor networks, mul-tihop broadcasting is a challenging problem, since every node has its own working schedules. In this paper, we design a novel broadcasting algorithm, of which key idea is to let some early wake-up nodes postpone their wake-up slots to overhear broadcasting message from its neighbors. This design utilizes the(More)
With the capability of fast, wireless communication, combined with cloud and location-based services, modern drivers can potentially access a wide variety of information about their automobile's environment. This paper presents a system for information query by the driver by using a simple pointing mechanism, combined with visual feedback in the form of a(More)
In this work, we introduce a real-time driver activity recognition method which takes a sequence of depth images as input and outputs an activity class among a predetermined set of driver activities. A classification algorithm called Random Forests is employed and further enhanced by a unique state based inference system to reduce initial classifier errors.(More)