Sang Joon Park

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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)
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)
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)
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)
OBJECTIVE The purpose of this study was to evaluate the fistulographic features of malfunctioning axillary loop-configured arteriovenous grafts and the efficacy of percutaneous interventions in failed axillary loop-configured arteriovenous grafts. MATERIALS AND METHODS Ten patients with axillary loop-configured arteriovenous grafts were referred for(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)
OBJECTIVE We wanted to evaluate the effectiveness of intraluminal irradiation with Holmium-166 ((166)Ho) for reducing the pseudointimal hyperplasia (PIH) in the transjugular intrahepatic portosystemic shunt (TIPS) tract in a swine model. MATERIALS AND METHODS TIPS was performed in 12 domestic pigs, after the creation of portal hypertension by intraportal(More)
OBJECTIVE The aim of this study was to evaluate whether the difference in the degree of collateral ventilation between canine and swine models of bronchial obstruction could be detected by using xenon-enhanced dynamic dual-energy CT. MATERIALS AND METHODS Eight mongrel dogs and six pigs underwent dynamic dual-energy scanning of 64-slice dual-source CT at(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)
OBJECTIVES To retrospectively investigate the added value of quantitative 3D shape analysis in differentiating encapsulated from invasive thymomas. MATERIALS AND METHODS From February 2002 to October 2013, 53 patients (25 men and 28 women; mean age, 53.94 ± 13.13 years) with 53 pathologically-confirmed thymomas underwent preoperative chest CT scans (slice(More)