Vikram Rao

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Stimulant use is a significant and prevalent problem, particularly in criminal populations. Previous studies found that cocaine and methamphetamine use is related to impairment in identifying emotions and empathy. Stimulant users also have abnormal neural structure and function of the ventromedial prefrontal cortex (vmPFC), amygdala, and anterior (ACC) and(More)
Executive Summary This report describes a variety of work that uses web-scale N-gram data. This work directly arose from a six-week research workshop at the Center for Language and Speech Processing at Johns Hopkins University in 2009. While the web provides a fantastic linguistic resource, collecting and processing data at web-scale is beyond the reach of(More)
—In high-performance DSP systems, the memory bandwidth can be improved using high-density interconnect technology and appropriate memory mapping. High-density MCM and flip-chip solder bump technology is used to achieve a system with an I/O bandwidth of 100 Gb/s/cm 2 die. The use of DRAMs in these systems usually make the performance of these systems poor,(More)
As microprocessor speeds increase, a large fraction of the execution time is often lost to cache miss penalties. This loss can be particularly severe in processors such as the UltraSPARC-IIICu which have in-order execution and block on cache misses. Such processors rely greatly on the compiler to reduce stalls and achieve high performance. This paper(More)
Error-related brain activity has become an increasingly important focus of cognitive neuroscience research utilizing both event-related potentials (ERPs) and functional magnetic resonance imaging (fMRI). Given the significant time and resources required to collect these data, it is important for researchers to plan their experiments such that stable(More)
Classification models are becoming useful tools for finding patterns in neuroimaging data sets that are not observable to the naked eye. Many of these models are applied to discriminating clinical groups such as schizophrenic patients from healthy controls or from patients with bipolar disorder. A more nuanced model might be to discriminate between levels(More)
Individuals with psychopathy are often characterized by emotional processing deficits, and recent research has examined the specific contexts and cognitive mechanisms that underlie these abnormalities. Some evidence suggests that abnormal features of attention are fundamental to emotional deficits in persons with psychopathy, but few studies have(More)
We designed a system that detects events using a single active node. When the context of the event (velocity or issue rate) changes, our system uses no extra energy cost within +/-20% of the specified range of velocities and issue rates. The ideal energy to detect an event is consumed by the following actions: resuming/booting a node, waking up the camera,(More)
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