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Tags associated with social images are valuable information source for superior image search and retrieval experiences. Although various heuristics are valuable to boost tag-based search for images, there is a lack of general framework to study the impact of these heuristics. Specifically, the task of ranking images matching a given tag query based on their(More)
Using Medicare cost reports, we examined the fifty US hospitals with the highest charge-to-cost ratios in 2012. These hospitals have markups (ratios of charges over Medicare-allowable costs) approximately ten times their Medicare-allowable costs compared to a national average of 3.4 and a mode of 2.4. Analysis of the fifty hospitals showed that forty-nine(More)
To identify the characteristics of the most profitable US hospitals, we examined the profitability of acute care hospitals in fiscal year 2013, measured as net income from patient care services per adjusted discharge. Based on Medicare Cost Reports and Final Rule Data, the median hospital lost $82 for each such discharge. Forty-five percent of hospitals(More)
We present the design and implementation of GLDA, a library that utilizes the GPU (Graphics Processing Unit) to perform Gibbs sampling of Latent Dirichlet Allocation (LDA) on a single machine. LDA is an effective topic model used in many applications, e.g., classification, feature selection, and information retrieval. However, training an LDA model on large(More)
California's Hospital Fair Pricing Act, passed in 2006, aims to protect uninsured patients from paying hospital gross charges: the full, undiscounted prices based on each hospital's chargemaster. In this study I examined how the law affects the net price actually paid by uninsured patients--a question critical for evaluating the law's impact. I found that(More)
With the rapid development of Android phones, the users' requirements are increasingly demanding. But the huge power consumption has seriously affected the users' communication demands. In this article, we introduce the power management modules and Wake Lock mechanism of the Android system, and analyze the power consumption of it. And we used DC power(More)
This study examines whether hospitals without physician participation on their boards of directors deliver lower quality of care. Using data from California nonprofit hospitals from 2004 to 2008, the authors document that the absence of physicians on the board is associated with a decrease of 3 to 5 percentage points in 3 of 4 measures of care quality. This(More)
Hospital executives are under continual pressure to control spending and improve quality. While prior studies have focused on the relationship between overall hospital spending and quality, the relationship between spending on specific services and quality has received minimal attention. The literature thus provides executives limited guidance regarding how(More)
Sequence alignment is a fundamental task for computational genomics research. We develop G-Aligner, which adopts the GPU as a hardware accelerator to speed up the sequence alignment process. A leading CPU-based alignment tool is based on the Bi-BWT index; however, a direct implementation of this algorithm on the GPU cannot fully utilize the hardware power(More)