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  1. Chapter and Conference Paper

    Hierarchical Shot Clustering for Video Summarization

    Digital video is rapidly becoming a communication medium for education, entertainment, and a variety of multimedia applications. With the size of the video collections growing to thousnads of hours, efficient ...

    YoungSik Choi, Sun Jeong Kim, Sangyoun Lee in Computational Science — ICCS 2002 (2002)

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    Chapter and Conference Paper

    Face Retrieval Using 1st- and 2nd-order PCA Mixture Model

    This paper deals with face retrieval using the 1st- and 2nd-order PCA mixture model. The well-known eigenface method uses one set of holistic facial features obtained by PCA. However, the single set of eigenfa...

    Sangyoun Lee, Hyun-Chul Kim, Dai** Kim in Computational Science and Its Applications… (2003)

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    Chapter and Conference Paper

    Relevance Feedback for Content-Based Image Retrieval Using Proximal Support Vector Machine

    In this paper, we present a novel relevance feedback algorithm for content-based image retrieval using the PSVM (Proximal Support Vector Machine). The PSVM seeks to find the optimal separating hyperplane by “r...

    YoungSik Choi, JiSung Noh in Computational Science and Its Applications – ICCSA 2004 (2004)

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    Chapter and Conference Paper

    Video Summarization Using Fuzzy One-Class Support Vector Machine

    In this paper, we address a video summarization task as generating both visually “salient” and semantically “important” video segments. In order to find salient data points, one can use the OC-SVM (One-class S...

    YoungSik Choi, KiJoo Kim in Computational Science and Its Applications – ICCSA 2004 (2004)

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    Chapter and Conference Paper

    A Focused Crawling for the Web Resource Discovery Using a Modified Proximal Support Vector Machines

    With the rapid growth of the World Wide Web, a focused crawling has been increasingly of importance. The goal of the focused crawling is to seek out and collect the pages that are relevant to a predefined set ...

    YoungSik Choi, KiJoo Kim, MunSu Kang in Computational Science and Its Applications… (2005)

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    Chapter and Conference Paper

    Fuzzy Kernel Ridge Regression for Classification

    We present a robust version of kernel ridge regression for classification, which can gracefully handle outliers. We first show that the ridge regression can be reduced to the proximal support vector machine (P...

    YoungSik Choi, JiSung Noh in Adaptive and Natural Computing Algorithms (2007)

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    Chapter and Conference Paper

    A Site-Ranking Algorithm for a Small Group of Sites

    Hyperlink, or shortly link, analysis seeks to model the web structures and discover the relations among web sites or Web pages. The extracted models or relations can be used for the web mining applications, in...

    KiJoo Kim, MunSu Kang, YoungSik Choi in Computational Science and Its Applications… (2007)

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    Chapter and Conference Paper

    The Multi Agent System Solutions for Wireless Sensor Network Applications

    This research proposes to employ multi-agent system solutions to the applications concerning with the wireless sensor network environment. It realizes the multi-agent community by combined use of intelligent s...

    Khin Haymar Saw Hla, YoungSik Choi in Agent and Multi-Agent Systems: Technologie… (2008)

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    Article

    A Comparative Study of Residual Stress Distribution Induced by Hard Machining Versus Grinding

    This study investigates the residual stress distribution induced by hard machining and grinding and compares its impact on fatigue parameters. The residual stress distribution below hard turned and ground surf...

    Youngsik Choi in Tribology Letters (2009)

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    Article

    Influence of Nano/Micro CBN Particle-Coated Tools on Rolling Contact Fatigue Performance of Hard-Machined AISI 1053 Steel

    In this article, we study the influence of the cubic boron nitride (CBN) particle size in nano/micro CBN particle-coated tools on the fatigue performance of hard-machined AISI 1053 steel. The effect of the CBN...

    Youngsik Choi in Tribology Letters (2012)

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    Article

    Impact evaluation of rolling contact fatigue life models

    Since the accurate prediction of fatigue life has a significant value, many researchers have attempted to develop a reliable fatigue life model. Recently, rolling contact fatigue life models incorporating mach...

    Youngsik Choi, ** Yang in Journal of Mechanical Science and Technology (2012)

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    Article

    Influence of explosive weight and steel thickness on behavior of steel plates

    The effective design of protective structures demands an understanding of complex physics processes involving various parameters. Thus, a considerable amount of test data is required. Because direct tests are ...

    Youngsik Choi, Joonwon Lee in International Journal of Precision Enginee… (2015)

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    Article

    A study on the effects of surface dimple geometry on fretting fatigue performance

    Recently, surface texturing has become a major method for improving the performance of contact bodies. Under tribological conditions, this method increases fatigue strength significantly. Advances in precision...

    Youngsik Choi, Joonwon Lee in International Journal of Precision Enginee… (2015)

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    Article

    A Study on the behavior of blast proof door under blast load

    The behavior of a blast proof door under a blast load was investigated experimentally and analytically. An experiment was carried out to study the behavior of the blast proof door induced by explosive detonati...

    Youngsik Choi, Joonwon Lee, Yo-Han Yoo in International Journal of Precision Enginee… (2016)

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    Article

    Effect of projectile incident angle on penetration of steel plates

    High speed impacts are complex phenomena influenced by various parameters. To predict the structural damage caused by a high speed impact, it is necessary to investigate the effect of various impact conditions...

    Jun-Min Cheon, Youngsik Choi in International Journal of Precision Enginee… (2016)

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    Article

    Effects of a Near-Field Explosion in a Tunnel Behind a Blast Proof Door

    In this study, the propagation of a pressure wave inside a tunnel due to explosion near the blast proof door is investigated. In addition, the peak pressures and its arrival time are measured experimentally. T...

    Joonwon Lee, Youngsik Choi in International Journal of Precision Enginee… (2018)

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    Article

    Effects of Cutting Speed on Surface Integrity and Fatigue Performance of Hard Machined Surfaces

    The study investigates the effects of cutting speed on the surface integrity and fatigue performance of hard machined surfaces. The results demonstrated that a higher cutting speed induces more compressive res...

    Youngsik Choi in International Journal of Precision Engineering and Manufacturing (2019)

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    Article

    Influence of Projectile Velocity on Penetration into a Steel Plate

    The effect of various impact conditions on the behavior of projectiles should be explored to determine the structural damage resulting from a high-velocity impact. Although the projectile velocity and incident...

    Jun-Min Cheon, Youngsik Choi in International Journal of Precision Enginee… (2020)

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    Article

    A study on the plasticity and fracture of the AISI 4340 steel alloy under different loading conditions and considering heat-treatment effects

    Comprehensive numerical and experimental studies were performed to investigate the plasticity and ductile fracture behaviors of the AISI 4340 steel alloy under multiaxial stress loading conditions and at diffe...

    Sami Ghazali, Mohammed Algarni, Yuanli Bai in International Journal of Fracture (2020)

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    Article

    Investigation on High Velocity Impact of Projectile on Double Layered Geomaterial

    This study investigated the high velocity impact phenomena of a projectile on double layered geomaterial consisting of soil and rock. Experiments were conducted to analyze the penetration depth of the projecti...

    Joonwon Lee, Youngsik Choi, Yuanli Bai in KSCE Journal of Civil Engineering (2022)

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