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2024-11-14
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I gave a keynote speech at the JMP Discovery Summit Korea 2024 and am
making the slides I used
publicly available.
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2024-10-24
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I am happy to announce that an UTFORSK grant from Norwegian Directorate
for Higher Education and Skills is awarded for the full four years of
2025–2028. This project is to increase research and education activities
in Statistics
of Complex Data (ScoDa) and is a joint grant between Universitetet i
Stavanger (Professor Joern Schulz as PI) and SNU, as the main foreign
partner.
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2024-10-17
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I am actively participating in the Interactions of Geometry and
Statistics (ISAG) II
workshop, IMS, NUS, in Singapore from Oct. 17 to Oct. 25.
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2024-10-16
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I gave a talk on Differential Privacy at the Privacy Future Forum,
hosted by Personal Information Protection Commission.
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2024-09-08
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I gave a talk on Privacy Enhancing Technologies at the 13th National
Statistics Development Forum.
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2024-09-01
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Welcome Jaeeun, Wooyeol and Jihyun to my lab!
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2024-07-18
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I am visiting the National Cancer Institute in the Washington, DC area
during my summer break.
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2024-06-21
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Congratulations to Dr. Donghyeok Jo, who has successfully defended his
PhD thesis “Advances on Statistical Inferences for Riemannian
Manifold-valued Data.”
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2024-06-12
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Congratulations to Dr. Sujin Lee, who has successfully defended her PhD
thesis “Variable Selection and Inference Strategies for Compositional
Regressions.”
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2024-06-03
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A research article, coauthored with David, Armin and my previous PhD
advisee Brian, on averaging SPD matrices is now accepted for publication
in Bernoulli, after six years of effort! Check out the preprint
at arXiv.
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2024-05-31
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Congratulations to Dr. Sangil Han, who has successfully defended his PhD
thesis “Advances in supervised and unsupervised dimension reduction.”
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2024-05-30
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I gave an invited talk
at the first PET Forum seminar of 2024, hosted by Personal
Information Protection Commission on AI-based synthetic data
generation.
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2024-05-27
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I have been selected to receive a five-year mid-career research grant
from the National Research Foundation of Korea (RS-2024-00333399).
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2024-05-14
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A research article on a principal component analysis for compositional
data, coauthored with Jaesung and Dr. Kipoong Kim, is accepted for a
publication in CSDA. This works uses the framework of
generalized Frechet means to evaluate the asymptotic properties of the
“compositional subspace” estimators.
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2024-04-01
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Welcome Dr. Soyul Han to my lab!
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2024-04-01
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Sujin’s work, comparing the debiasing-based and resampling-based
inference procedures for multiple compositional regression problems, is
accepted for a publication in ChemLab. Congratulations to
Sujin!
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2024-03-04
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I am very happy to announce that the Institute for Data
Innovation in Science (IDIS) at Seoul National University is
now established, and I am appointed as the director of the institute.
The core mission of IDIS is to spearhead data-driven innovation across
all scientific domains, leveraging data to tackle intricate scientific
hurdles, advance scientific frontiers, and foster societal progress.
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2024-02-29
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A research article on double data piling for multi-category
classification, co-authored with former students Taehyun and Woonyoung,
is accepted for a publication in Journal of Korean Statistical
Society. This will be my first JKSS paper.
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2024-02-16
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Some great news to share. Dr. Seung Woo Kwak is now a professor at
Sungkonghoe University; Dr. Kipoong Kim is now a professor at Changwon
National University. Congratulations! I welcome new members to the lab:
Graduate students Seongjae, Jeehyun and Chihoon have joined my lab.
Dr. Yangha Chung has also joined for the SSTF project.
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2024-02-02
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Dr. Kwak’s work on differentially private contingency table analysis is
accepted for publication in Stat. (link)
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2024-01-20
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The research article “Robust SVD Made Easy” is accepted for a poster
presentation in AISTATS 2024. Congratulations to Sangil and Kyoowon! (arXiv)
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2023-12-13
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[Closed] I have an opening for a postdoctoral researcher.
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2023-12-13
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Sangil and Minwoo’s work on sparse ordinal discriminant analysis is now
accepted for publication in Biometrics. This work adopts the
optimal scoring method, tailored to reflect ordinal responses, with a
sparsity enforcing penalization, and provides an accurate and
easy-to-interpret discriminant basis in high-dimensions.
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2023-10-23
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Changjo’s research on an application of TDA to data on the torus has
been accepted for publication in Stat. Congratulations to
Changjo!
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2023-10-18
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I am happy to announce that the natural science LAMP project team at SNU
is awarded the five-year LAMP project. This project supports data-based
discovery in all areas of natural sciences. Planned activities include
founding “Data Discovery Science Research Institute,” a new research
institute at SNU formed by expanding Statistical Research Institute. (post)
(news)
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2023-10-05
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Kipoong’s work on
Integrative Sparse Reduced-Rank Regression is now accepted for
publication in Statistics and Computing.
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2023-09-06
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A research article, titled “Comparisons of parametric and non-parametric
methods for analyzing RT-PCR experiment data” is accepted for
publication in ChemLab. This paper demonstrates the advantage
in using proper permutation tests in small-sample experiments. (link)
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2023-09-05
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A series of lecture videos on multivariate statistics, recorded in 2021,
is now posted on YouTube
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2023-09-01
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Welcome DongSun Yoon to the lab.
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2023-08-30
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Presented about Privacy Enhancing Technologies at the 12th national
statistics development forum, organized by Statistics Korea.
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2023-07-02
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Gave a talk on James-Stein eigenvector estimators at ECOSTA conference,
Tokyo, Japan.
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2023-06-01
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Our research team, consisting of Dr. Ahn, Dr. Park, Dr. Kim, and myself,
has been awarded a prestigious three-year Basic Research Lab grant. The
grant is specifically designated for conducting research in the field of
Data Privacy for Statistical Machine Learning.
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2023-02-24
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Featured in a YouTube clip.
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2023-02-21
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I gave an AI
& Natural Sciences seminar at Korea Institute for Advanced Study
(KIAS) on Feb 21, 2023.
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2023-01-26
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I gave an invited
lecture at the winter conference of the Korean Data Analysis Society, which
was held in person on Jan 26-27, 2023, in Pusan, Korea.
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2022-11-15
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My first popular science book, Data literacy
over mathematics (title translated from Korea, the book is
written in Korean) is now on sale. I
thank the editor, the publisher, and my family for their enormous
support.
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2022-10-04
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Sujin’s work on resampling-based
inference tools for compositional regression will appear in SMMR.
Congratulations to Sujin!
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2022-09-01
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Welcome Giheon, Changjo and Kyoowon to the lab.
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2022-07-25
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My textbook on nonparametric statistics is
selected as an excellent academic book by the National Academy of
Sciences of the Republic of Korea.
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2022-06-23
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I gave a public lecture during the KSS conference. The lecture is about
“statistics of things that cannot be averaged”, and you can find the
slides here.
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2022-05-11
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My team and I are selected to receive a three-year research grant on
Data Privacy from IITP. The mission is to enhance the use of synthetic
data in national database release mechanisms.
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2022-04-14
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An article introducing the R package ClusTorus
and its use is accepted for publication in the R journal. Kudos to
Seungki!
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2022-03-01
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My textbook on nonparametric statistics is
now on sale.
This book, written in Korean, is aimed at advanced undergraduate and
graduate students who are interested in nonparametric statistics.
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2022-03-01
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Welcome Dr. Kipoong Kim to the lab! Dr. Kim from Pusan University will
be supported by SSTF and investigate multi-source data analysis.
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2022-01-12
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[Closed] I have an opening for a postdoctoral researcher.
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2021-11-12
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A research paper revealing double
data piling phenomenon in high dimensional classification, and its
relation to negatively ridged classifier, is accepted for publication in
Electronic Journal of Statistics. This is jointly done with my
former student Woonyoung Chang and my collaborator Jeongyoun Ahn. We
were looking for a positve optimal ridge parameter, but found that our
intuition was wrong! A few more papers will come out in this line of
research.
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2021-10-26
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Juhee’s work on
differential privacy is accepted for publication in Korean Journal
of Applied Statistics. This article is written in Korean, and
discusses the use of bootstrap in testing equality of distributions
based on privatized histograms.
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2021-09-10
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I have received Research
Award from the College of Natural Science, Seoul National
University. Thanks!
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2021-09-01
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Welcome Taehyun Kim, a new masters student, Dr. Jongkyeong Kang and
Dr. Seung Woo Kwak to the lab. Dr. Kang from Korea Univ. will
investigate multi-source data analysis problems (supported by SSTF) and
Dr. Kwak from Univ. of Georgia will continue his research on data
privacy (supported in part by BK21 and by NRF).
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2021-07-08
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After years of waiting, “Uniqueness questions in a scaling-rotation
geometry on the space of symmetric positive-definite matrices” is
accepted for publication in Differential Geometry and its
Applications. This manuscript is part II of the 2017 EJS
paper, in which we addressed only 2 x 2 and 3 x 3 matrices. The
current paper addresses dimensions \(p\ge
4\). The link to this article is here.
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2021-06-02
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An R package ClusTorus
is available at CRAN. The contents in this package include the functions
for the AOAS article (see below), and an improved, and extended, version
of mixture model-based clustering for the multivariate angular data. All
credits go to Seungki Hong. We are preparing an article introducing this
R package and its use.
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2021-03-22
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An article discussing clustering the dihedral angles on the torus is
accepted for publication in The Annals of Applied Statistics
(AOAS). This article stems from an undergraduate intern report by Kiho
Park. With a help of Dr. Byungwon Kim (now at KNU), the article
discusses methods of clustering on the torus, and reveals a difference
among the clustering structures of glycoprotein backbone angles from
SARS-CoV-2 and those from other strains of coronaviruses.
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2021-03-03
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[Closed] I have an opening for a postdoctoral researcher, at least one
new master’s student, and one new master-Ph.D combined student at my
lab.
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2021-03-03
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We have launched a new website for the lab: https://statlet.github.io
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2021-01-23
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My paper “Geodesic projection of the von Mises-Fisher distribution for
projection pursuit of directional data” (link)
is accepted for publication in Electronic Journal of
Statistics. This answers a fundamental question in directional
statistics: If a von Mises-Fisher distributed random direction is
projected onto a geodesic, it is still von Mises distributed?
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2020-12-19
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The manuscript “Covariance-engaged
Classification of Sets via Linear Programming” is accepted for
publication in Statistica Sinica. This work studies sparse
estimations for “set classification” and their theoretical properties.
It was conceived by Xingye and myself about five years ago, but a real
development began after Zhao joined the team.
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2020-10-19
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I, Mark and Steve wrote a response to a letter to the editor in The
Annals of Applied Statistics (AOAS). The letter comments on the EM
algorithm we used in our 2011 AOAS paper. We thought a proper response
was due. This letter will appear in AOAS. (It appeared in two months: Here is the link.)
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2020-10-06
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I am selected to receive a prestigious five-year research
grant from Samsung Science & Technology Foundation. The
proposed topic is on generalizations of multi-source integrative factor
models and statistical inference.
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2020-09-22
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The manuscript “Adjusting systematic bias
in high dimensional principal component scores,” written by myself
is accepted for publication in Statistica Sinica.
Statistica Sinica is notorious for its long interval between
the acceptance and print.
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2020-08-30
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A video explaining my research interest is on YouTube. This is
a part of the CNS series of promoting research agendas. Intended viewers
are prospective graduate students.
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2020-08-07
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The manuscript “Covariate-driven factorization
by thresholding for multi-block data” is accepted for publication in
Biometrics. This work is written by Xing (my former PhD
student), Sungwon (again my former PhD student), Gen and myself and is a
major part of Xing’s doctoral dissertation.
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2020-06-26
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The manuscript “Covariance-engaged Classification of Sets via Linear
Programming” by Zhao, Xingye and myself is now on arXiv.
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2020-02-20
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The manuscript “Kurtosis test of modality for rotationally symmetric
distributions on hyperspheres,” by Byungwon, Joern and myself, is
accepted for publication in The Journal of Multivariate
Analysis. (link)
This work is part of Byungwon’s PhD dissertation, but changes since then
are enormous. The issues addressed and raised in this paper lead to a
promising research direction on projection pursuit for directional data.
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2019-09-06
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I have received Excellence in
Teaching Award from the College of Natural Science. Thanks!
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2019-08-08
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I am now an associate editor of Computational Statistics & Data
Analysis.
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2019-02-20
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I am selected to receive a five-year mid-career research grant
from National Research Foundation. The proposed topic is on
high-dimensional and non-Euclidean statistics.
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2018-12-18
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The manuscript “Small sphere distributions for directional data with
application to medical imaging” by Stephan, Joern, Byungwon and myself
is accepted for publication in Scandinavian Journal of
Statistics. (link)
This work began its life in 2015 from a query from Steve Marron (Is
there a parametric distribution for small-circle behavior of data?).
Stephan and I sent a preliminary version of this to a conference, then
decided not to publish. Byungwon took over and has created a nice family
of distributions on hyperspheres, called “Small sphere distributions”.
This is a part of his PhD dissertation.
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2018-10-30
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My contribution to the Korean Statistical Society newsletter is now in
print. It’s about data science education (from the statistical
perspective) and is written in Korean. You can see it here
but the online version is only for members.
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2018-10-10
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As a new faculty member of Seoul National University, I did an interview
introducing myself (link).
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2018-10-09
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The manuscript “Penalized Orthogonal Iteration for Sparse Estimation of
Generalized Eigenvalue Problem” by Prfessors Jeon and Ahn, and myself,
is accepted for publication in Journal of Computational and
Graphical Statistics. (link)
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2018-09-01
|
I have officially joined the department of Statistics at Seoul National
University.
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