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http://dx.doi.org/10.5351/KJAS.2013.26.2.335

Empirical Mode Decomposition using the Second Derivative  

Park, Min-Su (Department of Statistics, Seoul National University)
Kim, Donghoh (Department of Applied Mathematics, Sejong University)
Oh, Hee-Seok (Department of Statistics, Seoul National University)
Publication Information
The Korean Journal of Applied Statistics / v.26, no.2, 2013 , pp. 335-347 More about this Journal
Abstract
There are various types of real world signals. For example, an electrocardiogram(ECG) represents myocardium activities (contraction and relaxation) according to the beating of the heart. ECG can be expressed as the fluctuation of ampere ratings over time. A signal is a composite of various types of signals. An orchestra (which boasts a beautiful melody) consists of a variety of instruments with a unique frequency; subsequently, each sound is combined to form a perfect harmony. Various research on how to to decompose mixed stationary signals have been conducted. In the case of non-stationary signals, there is a limitation to use methodologies for stationary signals. Huang et al. (1998) proposed empirical mode decomposition(EMD) to deal with non-stationarity. EMD provides a data-driven approach to decompose a signal into intrinsic mode functions according to local oscillation through the identification of local extrema. However, due to the repeating process in the construction of envelopes, EMD algorithm is not efficient and not robust to a noise, and its computational complexity tends to increase as the size of a signal grows. In this research, we propose a new method to extract a local oscillation embedded in a signal by utilizing the second derivative.
Keywords
Empirical mode decomposition; mean envelope; intrinsic mode functions; frequency; electrocardiogram;
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Times Cited By KSCI : 2  (Citation Analysis)
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