Sang Joon Park

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Voters in a democracy have the responsibility to learn about the candidates and issues on which they are deciding. The internet offers voters unparalleled opportunities for finding information relevant to elections. Use of the internet for politics is increasing dramatically, yet we know little about the details of what people are doing with it. We describe(More)
Electronic voting is slowly making its way into American politics. At the same time, more voters and potential voters are using online news and political information sources to help them make voting choices. We conducted a mock-voting study, using real candidates, issues, and campaign materials. Political information was browsed either online or on paper,(More)
BACKGROUND Eosinophilic inflammation of the airway is usually associated with airway hyper-responsiveness in bronchial asthma. However, there is a small group of patients which has the eosinophilic inflammation in the bronchial tree with normal spirometry and no evidence of airway hyper-responsiveness, which was named eosinophilic bronchitis. The objectives(More)
BACKGROUND AND PURPOSE To apply a texture analysis of apparent diffusion coefficient (ADC) maps to evaluate glioma heterogeneity, which was correlated with tumor grade. MATERIALS AND METHODS Forty patients with glioma (WHO grade II (n = 8), grade III (n = 10) and grade IV (n = 22)) underwent diffusion-weighted imaging (DWI), and the corresponding ADC maps(More)
This study introduces a novel texture analysis scheme applied to perfusion volumes in dynamic contrast-enhanced (DCE) breast MRI to provide a method of lesion discrimination. DCE MRI was applied to 24 lesions (12 malignant, 12 benign). Automatic segmentation was performed for extraction of a lesion volume, which was divided into whole, rim and core volume(More)
In this study we report how different interfaces for searching the internet changed the strategies and information opportunities of voters as they searched for political information. A drop-down interface that helped users define specific queries was compared to a traditional typed-query interface. The drop-down interface resulted in a broader set of(More)
This study was conducted to evaluate the effectiveness and safety of a practical protocol for titrating positive end-expiratory pressure (PEEP) involving recruitment maneuver (RM) and decremental PEEP. Seventeen consecutive patients with acute lung injury who underwent PEEP titration were included in the analysis. After baseline ventilation, RM (continuous(More)
BACKGROUND In elderly asthmatics, underdiagnosis is one of the important features. The main reason for underdiagnosis is thought to be a low frequency in complaining of symptoms due to the reduction of intellectual recognition and physical activity. Among the various symptoms, wheezing is the principal clue in diagnosing bronchial asthma, and decreased(More)
PURPOSE This study investigates morphologic change of the rectosigmoid colon using a belly board in prone position and distended bladder in patients with rectal cancer. We evaluate the possibility of excluding the proximal margin of anastomosis from the radiation field by straightening the rectosigmoid colon. MATERIALS AND METHODS Nineteen patients who(More)
This study was designed to classify contrast enhancement curves using both three-time-points (3TP) method and clustering approach at full-time points, and to introduce a novel evaluation method using perfusion volume fractions for differentiation of malignant and benign lesions. DCE-MRI was applied to 24 lesions (12 malignant, 12 benign). After region(More)