User profiles for Karthikeyan Umapathy

Karthikeyan Umapathy

Associate Professor, School of Computing, University of North Florida
Verified email at unf.edu
Cited by 754

Phase mapping of cardiac fibrillation

K Umapathy, K Nair, S Masse, S Krishnan… - Circulation …, 2010 - Am Heart Assoc
Phase is a descriptor that tracks the progression of a defined region of myocardium through
the action potential and has been demonstrated to be an effective parameter in analyzing …

Discrimination of pathological voices using a time-frequency approach

K Umapathy, S Krishnan, V Parsa… - IEEE Transactions on …, 2005 - ieeexplore.ieee.org
Acoustical measures of vocal function are routinely used in the assessments of disordered
voice, and for monitoring the patient's progress over the course of voice therapy. Typically, …

A meta-analysis of pair-programming in computer programming courses: Implications for educational practice

K Umapathy, AD Ritzhaupt - ACM Transactions on Computing Education …, 2017 - dl.acm.org
Several experiments on the effects of pair programming versus solo programming in the
context of education have been reported in the research literature. We present a meta-analysis …

Audio signal feature extraction and classification using local discriminant bases

K Umapathy, S Krishnan, RK Rao - IEEE Transactions on …, 2007 - ieeexplore.ieee.org
Audio feature extraction plays an important role in analyzing and characterizing audio content.
Auditory scene analysis, content-based retrieval, indexing, and fingerprinting of audio are …

Block-based versus text-based programming environments on novice student learning outcomes: A meta-analysis study

…, AD Ritzhaupt, F Tian, K Umapathy - Computer Science …, 2019 - Taylor & Francis
Background and Context: The use of block-based programming environments is purported to
be a good way to gently introduce novice computer programmers to computer programming…

Modified local discriminant bases algorithm and its application in analysis of human knee joint vibration signals

K Umapathy, S Krishnan - IEEE Transactions on Biomedical …, 2006 - ieeexplore.ieee.org
Knee joint disorders are common in the elderly population, athletes, and outdoor sports
enthusiasts. These disorders are often painful and incapacitating. Vibration signals […

Intramural activation during early human ventricular fibrillation

K Nair, K Umapathy, T Farid, S Masse… - Circulation …, 2011 - Am Heart Assoc
Background— We investigated patterns of intramural activation in early human ventricular
fibrillation (VF) and hypothesized that intramural reentry colocalizes to sites with increased …

Multigroup classification of audio signals using time-frequency parameters

K Umapathy, S Krishnan… - IEEE Transactions on …, 2005 - ieeexplore.ieee.org
The ongoing advancements in the multimedia technologies drive the need for efficient
classification of the audio signals to make the content-based retrieval process more accurate and …

Role of KATP Channels in the Maintenance of Ventricular Fibrillation in Cardiomyopathic Human Hearts

…, MA Azam, A Maguy, PFH Lai, K Umapathy… - Circulation …, 2011 - Am Heart Assoc
Rationale: Ventricular fibrillation (VF) leads to global ischemia. The modulation of ischemia-dependent
pathways may alter the electrophysiological evolution of VF. Objective: We …

Time-frequency analysis via Ramanujan sums

L Sugavaneswaran, S Xie, K Umapathy… - IEEE Signal …, 2012 - ieeexplore.ieee.org
Research in signal processing shows that a variety of transforms have been introduced to
map the data from the original space into the feature space, in order to efficiently analyze a …