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2019 Vol.52, Issue 8 Preview Page

Research Article

Selecting a mother wavelet for univariate wavelet analysis of time series data

시계열 자료의 단변량 웨이블릿 분석을 위한 모 웨이블릿의 선정

Hyunwook Leea
,
Jinwook Leeb
,
Chulsang Yooc*
이 현욱a
,
이 진욱b
,
유 철상c*
aM.D Candidate, Department of Civil, Environmental and Architectural Engineering, Korea University
bPh.D Candidate, Department of Civil, Environmental and Architectural Engineering, Korea University
cProfessor, Department of Civil, Environmental and Architectural Engineering, Korea University
a고려대학교 건축사회환경공학과 석사과정
b고려대학교 건축사회환경공학과 박사과정
c고려대학교 건축사회환경공학과 교수
* Corresponding Author
31 August 2019. pp. 575-587
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Abstract

This study evaluated the effect of a mother wavelet in the wavelet analysis of various times series made by combining white noise and/or sine function. The result derived is also applied to short-memory arctic oscillation index (AOI) and long-memory southern oscillation index (SOI). This study, different from previous studies evaluating one or two mother wavelets, considers a total of four generally-used mother wavelets, Bump, Morlet, Paul, and Mexican Hat. Summarizing the results is as follows. First, the Bump mother wavelet is found to have some limitations to represent the unstationary behavior of the periodic components. Its application results are more or less the same as the spectrum analysis. On the other hand, the Morlet and Paul mother wavelets are found to represent the non-stationary behavior of the periodic components. Finally, the Mexican Hat mother wavelet is found to be too complicated to interpret. Additionally, it is also found that the application result of Paul mother wavelet can be inconsistent for some specific time series. As a result, the Morlet mother wavelet seems to be the most stable one for general applications, which is also assured by the recent trend that the Morlet mother wavelet is most frequently used in the wavelet analysis research.

Keywords
Wavelet analysis
Mother wavelet
Arctic oscillation
Southern oscillation

본 연구에서는 모 웨이블릿(mother wavelet)이 웨이블릿 분석에 미치는 영향을 파악하기 위해 먼저 백색잡음과 사인함수를 다양하게 결합한 시계열의 분석을 수행하고 그 결과를 각각 단기기억특성과 장기기억특성을 보이는 북극진동지수(AOI)와 남방진동지수(SOI)에 대한 적용하였다. 본 연구에서는 기존 연구가 하나 또는 두 개의 모 웨이블릿 평가에 제한된 것과는 달리 총 4가지의 웨이블릿에 대한 비교·평가를 수행하였다. 본 연구에서 선정한 웨이블릿은 기존 연구에 많이 사용된 바 있는 총 4가지의 모 웨이블릿(Bump, Morlet, Paul, Mexican Hat)이다. 그 결과는 다음과 같다. 먼저, Bump 모 웨이블릿을 적용한 결과는 주기성분의 비정상성을 나타내는데 한계가 있는 것으로 확인되었다. 그 결과는 스펙트럼 분석결과와 매우 유사한 수준인 것으로 나타났다. 이에 반해 Morlet과 Paul 모 웨이블릿은 주기성분의 비정상성을 상대적으로 잘 나타내 주는 것으로 확인되었다. 마지막으로 Mexican Hat 모 웨이블릿의 경우에는 그 결과의 해석이 까다로운 것으로 나타났다. 추가로, Paul 모 웨이블릿의 적용 결과가 시계열에 따라 일관적이지 않게 나타날 수 있음도 확인하였다. 결과적으로 Morlet 모 웨이블릿은 본 연구에서 고려한 모 웨이블릿 중 그 적용상 안정성이 가장 높은 것으로 확인되었으며, 이러한 결과는 최근 웨이블릿 관련 연구에서 Morlet 모 웨이블릿이 가장 많이 사용되는 추세와도 일치하는 것이다.

키워드
웨이블릿 분석
모 웨이블릿
북극진동
남방진동
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 52
  • No :8
  • Pages :575-587
  • Received Date : 2019-04-24
  • Revised Date : 2019-08-19
  • Accepted Date : 2019-08-22
  • DOI :https://doi.org/10.3741/JKWRA.2019.52.8.575
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