Jason Ng

Learn More
OBJECTIVES This study sought to test the hypothesis that "virtual" electrophysiological studies (EPS) on an anatomic platform generated by 3-dimensional magnetic resonance imaging reconstruction of the left ventricle can reproduce the reentrant circuits of induced ventricular tachycardia (VT) in a porcine model of myocardial infarction. BACKGROUND(More)
The object of this paper is to produce non-parametric maximum likelihood estimates of forecast distributions in a general non-Gaussian, non-linear state space setting. The transition densities that de…ne the evolution of the dynamic state process are represented in parametric form, but the conditional distribution of the non-Gaussian variable is estimated(More)
Social media companies operating in China face a complex array of regulations and are liable for content posted to their platforms. Through reverse engineering we provide a view into how keyword censorship operates on four popular social video platforms in China: YY, 9158, Sina Show, and GuaGua. We also find keyword surveillance capabilities on YY. Our(More)
Atrial fibrillation (AF) electrograms are characterized by varying morphologies, amplitudes, and cycle lengths (CLs), presenting a challenge for automated detection of individual activations and the activation rate. In this study, we evaluate an algorithm to detect activations and measure CLs from AF electrograms. This algorithm iteratively adjusts the(More)
The purpose of this study was to examine the mechanomyographic (MMG) amplitude and mean power frequency (MPF) versus power output relationships for the vastus lateralis and rectus femoris muscles during incremental cycle ergometry between the piezoelectric contact sensor (HP) and the accelerometer (ACC) sensor. Nine men performed an incremental cycle(More)
Clustering is a term that describes the idea of linking together multiple low-cost, commercially available machines in order to achieve processing power of a magnitude impossible to otherwise obtain without the use of purpose-built supercomputers. A cluster of less individually capable machines can rival the performance of a supercomputer, while being more(More)
BACKGROUND Atrial 4D flow magnetic resonance imaging was used for the characterization of left atrial (LA) and left atrial appendage (LAA) flow dynamics in patients with atrial fibrillation (AF). METHODS AND RESULTS 4D flow magnetic resonance imaging measured in vivo 3D blood flow velocities in 60 AF patients and 15 controls. Anatomic maps of LA and LAA(More)