Billy Cheung

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Overlaid reference elements need to be sufficiently visible to effectively relate to the underlying information, but not so obtrusive that they clutter the presentation. We seek to create guidelines for presenting such structures through experimental studies to define boundary conditions for visual intrusiveness. We base our work on the practice of(More)
BACKGROUND The aim of this study was to determine the safety of anti-reflux surgery for lung transplant recipients and assess its effect on lung function. METHODS We retrospectively collected and analyzed data from all lung transplant recipients who underwent anti-reflux surgery at St Mary's Hospital London from July 2005 to May 2012. The indications for(More)
This investigation determined some of the better strategies for delivering educational resources to mobile devices from the Digital Reading Room (DRR) and the Athabasca University(AU) library catalogue using AirPac, making recommendations on the implementation of Mlearning as part of the AU e-learning strategy. The primary research question addressed in(More)
AIM The assessment of hospital performance with reference to patients who receive Austin Moore hemiarthroplasty for neck of femur fractures and the assessment of patients at medium term follow up. METHODS A retrospective review of 103 Austin Moore hemiarthroplasties in 101 patients. This review spans an 11 year period at this institution. A clinical(More)
BACKGROUND Pulmonary emboli, which have occurred in association with air travel, in the past have been thought to have arisen from deep venous thromboses (DVT) which formed during the flight. HYPOTHESIS This study was performed to test the idea that not all pulmonary emboli which occur following air travel are the result of inflight DVT formation. (More)
A 20-year-old man was admitted to the emergency department after falling 15 m onto the roof of a car and landing on his back. Imaging by computed tomography (CT) showed delayed perfusion of the right kidney and no excretion of contrast from that kidney on delayed images. Angiography confirmed a localized intimal dissection in the right main renal artery. We(More)
BACKGROUND The use of a three-dimensional (3-D) auditory display to significantly lower subject detection level while maintaining comprehension under sustained positive G-stress was explored in this study. METHODS Auditory threshold levels were measured for detecting a band limited pulsed signal in the presence of a broadband diotic masker at both + 1 Gz(More)
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