*September 30, 2011*:
Dr. Brani Vidakovic will give an invited talk at the
31st Annual Southeastern-Atlantic Regional
Conference on Differential Equations (SEARCDE-2011) at Georgia Southern University in Statesboro, Georgia.
The topic of the talk will be "Wavelets: Data Analytic Perspective". The conference will take place on September 30th
through October 1st, 2011.
*September 1, 2011*:
A research paper collaboration from several BESTA members was accepted to the
2011 IEEE International Conference on Bioinformatics and Biomedicine.
This research will be presented at the conference in Atlanta, Georgia in mid-November. Congratulations to the team!
Title: Diagnostic Classification of Digital Mammograms by Wavelet-Based Spectral Tools: A Comparative Study
Authors: Erin K. Hamilton, Seonghye Jeon,
Pepa Ramirez Cobo, Kichun Sky Lee, Brani Vidakovic
*August 22, 2011*:
BESTA welcomes undergraduate researchers Michelle Rost and
Kevin Lewis. They will be working with Dr. Vidakovic on various research and
consulting projects in BME throughout this semester.
*August 2, 2011*:
Seonghye Jeon presented at the
2011 Joint Statistical Meetings in Miami, Florida.
The contributed paper applied wavelet-based assessment methods to mammography image classification.
Session:New Advances in
Statistical Learning and Data Mining - Contributed Papers
Section on Statistical Learning and Data Mining
Title: Assessing Data Regularity in Complex Wavelet Domain: Application to Mammography Image Classification
Abstract: A wide range of complex structures in nature exhibits irregular behavior in both time and scale.
Although irregular, the phenomena can be well modeled by multifractal processes that are quantified by statistical
similarity of patterns at different scales. Wavelet transform is a powerful tool for analyzing the complex structures of
the data and assessing the regularity of the multifractal processes. Complex wavelets have been advocated as solutions to
some of the limitations of the real-valued wavelet transforms. Apart from the Haar wavelet, complex wavelets are only
compactly supported orthogonal wavelets which are symmetric. Another advantage of the complex wavelets is the
complementary phase information that describes the coherent structure of the image. Although complex wavelet transform
has been used in various areas, ours is the first to explore the comprehensive regularity indices. We extend the wavelet
spectrum and multifractal spectrum to the complex wavelet domain and propose new regularity descriptors including phase
information and coherence function. This study is motivated and illustrated by mammography image classification.
Dr. Brani Vidakovic's new textbook, titled
Bioengineering Sciences has been published in the Springer Texts in Statistics Series, and is now available to
view online, or to purchase in print.
*July 11, 2011*:
Erin Hamilton began an ORISE Research Fellowship at the Centers for Disease Control and Prevention (CDC).
This year-long position will last from July 2011 through July 2012.
*June 6, 2011*:
Dr. Brani Vidakovic presented an invited talk at the Workshop on
Infusing Statistics and Engineering (WISE) at Harvard University.
Title: "A wavelet-based spectral method for extracting self-similarity
measures in time-varying two-dimensional rainfall maps"
Many environmental time-evolving spatial phenomena are characterized by a large number of energetic modes,
the occurrence of irregularities, and the self organization over a wide range of space or time scales.
Precipitation is a classical example characterized by both strong intermittency and multi-scale dynamics,
and these features generate in turn persistence, long-range dependence, and extremes (whether be it
droughts or extreme floods). Over the last two decades, time-frequency or time-scale transforms
have become indispensable tools in the analysis of such phenomena, and as a consequence, a number of
wavelet-based spectral methods are now routinely employed to estimate measures of regularity and scaling.
An ensemble of new wavelet-based spectral tools for analysis of 2-D images is proposed. The new scale-mixing
wavelet spectrum is applied to the analysis of time sequences of two-dimensional spatial rainfall radar images
characterized by either convective or frontal systems. Intermittent spatial patterns connected to the
precipitation formation mechanisms were encoded in low-dimensional informative descriptors appropriate for
classification and discrimination analyses and possible integration with climate models. We found that convective
rainfall spatial patterns compared to frontal patterns produce spectral signatures consistent with their
This is joint work with Pepa Ramirez-Cobo, Kichun Sky Lee, Annalisa Molini, and Gabriel Katul.
*May 27, 2011*:
Dr. Brani Vidakovic gave an invited lecture titled "New 2-D wavelet-based spectral tools and applications,"
at Jornada sobre Estadistica y Climatologia at the University of Seville.
*May 12, 2011*:
Congratulations to Norbert Remenyi on a successful research proposal
*May 11, 2011*:
Congratulations to Sofia Espinoza on a successful research proposal
*May 6, 2011*:
Dr. Dipankar Bandyaopadhyay from Medical University of South Carolina gives seminar talk at Georgia Tech on Bayesian spatial models with dental applications.
*February 14, 2011*:
Dr. Brani Vidakovic featured in the February 2011 issue of The Pioneer -- "Faculty Spotlight: Dr. Brani Vidakovic"
*February 1, 2011*:
Professor Pedro Alberto Morettin from University of São Paulo (Brazil) gives seminar talk at Georgia Tech on Wavelet Estimation of Copulas for Time Series.
*January 27, 2011*:
Dr. Hildete Prisco Pinheiro from University of Campinas (Brazil) gives seminar talk at Georgia Tech on Homogeneity Tests Among Groups for Microsatellite Data.
*January 21, 2011*:
Congratulations to Seonghye Jeon on a successful research proposal presentation!
Topic: "Bayesian data mining techniques in public health and bio applications"
*February 15, 2010*:
Brani Vidakovic Collaborates in Brazil (from the February 2010 issue of the "BME Insider" internal newsletter)
Brani Vidakovic was invited to join the Scientific Committee of the XIX Brazilian Congress on Probability and Statistics
(SINAPE), to be held in São Pedro in July. Brani also has received grants from FAPESP (Fundacao de Auxilio a Pesquisa no
Estado de São Paulo) and CNPQ (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico) for two short visits to
São Paulo and Campinas to work with Professors Pedro Alberto Morettin (USP) and Aluisio de Souza Pinheiro (UNICAMP) on
a project leading to a monograph on Wavelet-based Functional Data Analysis. The monograph will be published by
Springer-Verlag in 2011.