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We provide a characterization of the spectral minimum for a random Schrödinger operator of the form H = −∆ + i∈Z d q(x − i − ω i) in L 2 (R d), where the single site potential q is reflection symmetric, compactly supported in the unit cube centered at 0, and the displacement parameters ω i are restricted so that adjacent single site potentials do not(More)
The amount of textual data that is available for researchers and businesses to analyze is increasing at a dramatic rate. This reality has led IS researchers to investigate various text mining techniques. This essay examines four text mining methods that are frequently used in order to identify their characteristics and limitations. The four methods that we(More)
This paper explains how visual representations of data enable individual sensemaking in data exploration tasks. We build upon theories of human perception and cognition, including Cognitive Fit Theory, to explain what aspects of visual representations facilitate sensemaking for the viewer. We make three primary contributions. First, we give a general(More)
The objective of this study was to evaluate the efficacy and safety of divalproex sodium extended release (divalproex ER) vs placebo in combination with olanzapine or risperidone for the treatment of acute exacerbations of schizophrenia. In this 12-week, randomized, double-blind, parallel-group, multi-center trial, a total of 402 patients were randomized(More)
We study low-energy properties of the random displacement model, a random Schrödinger operator describing an electron in a randomly deformed lattice. All periodic displacement configurations which minimize the bottom of the spectrum are characterized. While this configuration is essentially unique for dimension greater than one, there are infinitely many(More)
OBJECTIVES To study the effects of levodopa and walking speed on gait variability in individuals with Parkinson's disease (PD). METHODS Thirty-three individuals with PD were studied. Their mean age was 70.61±9.23 year. The average time since diagnosis was 9.65±5.80 year. Gait variability was studied while 'OFF' and 'ON' dopaminergic medication when the(More)