Efficient differentially private kernel support vector classifier for multi-class classification

J Park, Y Choi, J Byun, J Lee, S Park - Information Sciences, 2023 - Elsevier
In this paper, we propose a multi-class classification method using kernel supports and a
dynamical system under differential privacy. For small datasets, kernel methods, such as …

Parametric models and non-parametric machine learning models for predicting option prices: Empirical comparison study over KOSPI 200 Index options

H Park, N Kim, J Lee - Expert Systems with Applications, 2014 - Elsevier
We investigated the performance of parametric and non-parametric methods concerning the
in-sample pricing and out-of-sample prediction performances of index options. Comparisons …

Improving memory-based collaborative filtering via similarity updating and prediction modulation

B Jeong, J Lee, H Cho - Information Sciences, 2010 - Elsevier
Memory-based collaborative filtering (CF) makes recommendations based on a collection of
user preferences for items. The idea underlying this approach is that the interests of an …

Generative Bayesian neural network model for risk-neutral pricing of American index options

H Jang, J Lee - Quantitative Finance, 2019 - Taylor & Francis
Financial models with stochastic volatility or jumps play a critical role as alternative option
pricing models for the classical Black–Scholes model, which have the ability to fit different …

Sentiment visualization and classification via semi-supervised nonlinear dimensionality reduction

K Kim, J Lee - Pattern Recognition, 2014 - Elsevier
Sentiment analysis, which detects the subjectivity or polarity of documents, is one of the
fundamental tasks in text data analytics. Recently, the number of documents available online …

Penalty for Sparse Linear and Sparse Multiple Kernel Multitask Learning

A Rakotomamonjy, R Flamary… - IEEE Transactions on …, 2011 - ieeexplore.ieee.org
Recently, there has been much interest around multitask learning (MTL) problem with the
constraints that tasks should share a common sparsity profile. Such a problem can be …

Recent advances in support vector clustering: Theory and applications

H Li, Y ** - International Journal of Pattern Recognition and …, 2015 - World Scientific
As an important boundary-based clustering algorithm, support vector clustering (SVC) can
benefit many real applications owing to its capability of handling arbitrary cluster shapes …

Active learning using transductive sparse Bayesian regression

Y Son, J Lee - Information Sciences, 2016 - Elsevier
Active learning, one of large and important branches in machine learning and data mining,
aims to build an accurate learning model with a relatively small number of labeled points …

Convex decomposition based cluster labeling method for support vector clustering

Y **, YJ Tian, YJ Zhou, YX Yang - Journal of Computer Science and …, 2012 - Springer
Support vector clustering (SVC) is an important boundary-based clustering algorithm in
multiple applications for its capability of handling arbitrary cluster shapes. However, SVC's …

Improving the utility of differentially private clustering through dynamical processing

J Byun, Y Choi, J Lee - Pattern Recognition, 2025 - Elsevier
This study aims to alleviate the trade-off between utility and privacy of differentially private
clustering. Existing works focus on simple methods, which show poor performance for non …