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  1. Article

    Open Access

    Approximating Intermediate Feature Maps of Self-Supervised Convolution Neural Network to Learn Hard Positive Representations in Chest Radiography

    Recent advances in contrastive learning have significantly improved the performance of deep learning models. In contrastive learning of medical images, dealing with positive representation is sometimes difficu...

    Kyung** Cho, Ki Duk Kim, Jiheon Jeong… in Journal of Imaging Informatics in Medicine (2024)

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  2. No Access

    Article

    A Hospital-Based Infant Safe Sleep Intervention and Safe Sleep Practices Among Young Women: A Prospective Longitudinal Study

    The rates of sudden unexpected infant death (SUID) are still high in the U.S. The longitudinal effects of SUID preventive education on infant safe sleep practices are less known. The current study evaluated th...

    Sunny H. Shin, Changyong Choi, Shu-Fang Shih… in Maternal and Child Health Journal (2023)

  3. Article

    Open Access

    CheSS: Chest X-Ray Pre-trained Model via Self-supervised Contrastive Learning

    Training deep learning models on medical images heavily depends on experts’ expensive and laborious manual labels. In addition, these images, labels, and even models themselves are not widely publicly accessib...

    Kyung** Cho, Ki Duk Kim, Yu** Nam, Jiheon Jeong… in Journal of Digital Imaging (2023)

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  4. No Access

    Chapter and Conference Paper

    CT Kernel Conversion Using Multi-domain Image-to-Image Translation with Generator-Guided Contrastive Learning

    Computed tomography (CT) image can be reconstructed by various types of kernels depending on what anatomical structure is evaluated. Also, even if the same anatomical structure is analyzed, the kernel being us...

    Changyong Choi, Jiheon Jeong, Sangyoon Lee… in Medical Image Computing and Computer Assis… (2023)

  5. No Access

    Article

    How do Family Economic Contexts Affect Children’s Subjective Well-Being? A Study of South Korea

    The aim of this research is to examine the relationship between family economic contexts and children’s subjective well-being using a child-centric perspective and to examine the mediation effects of basic psy...

    Joan P. Yoo, Changyong Choi in Child Indicators Research (2016)

  6. No Access

    Article

    Blood-compatible and biodegradable polymer-coated drug-eluting stent

    A drug-eluting stent (DES) is a metal stent that has been coated with a drug known to suppress restenosis. To prepare a novel DES, a bare metal stent (BMS) was coated with sirolimus (SRL) in a blood-compatible...

    Jun-kyu Park, Dong-Gon Kim, In Ho Bae, Kyung Seob Lim… in Macromolecular Research (2015)

  7. No Access

    Article

    Surfactant-free nanoparticles of doxorubicin-conjugated poly(DL-lactide-co-glycolide)

    Doxorubicin (DOX)-conjugated poly(DL-lactide-co-glycolide)(PLGA) was synthesized and nanoparticles were prepared without the use of a surfactant. The DOX content in the nanoparticles ranged from 1.2 to 4.75% (w/w...

    Manh-Tuan Vu, Young-IL Jeong, Changyong Choi, Joung-Pyo Nam… in Macromolecular Research (2010)

  8. No Access

    Article

    Insulin-incorporated chitosan nanoparticles based on polyelectrolyte complex formation

    Insulin-incorporated nanoparticles were prepared by polyelectrolyte complex formation using low-molecular weight water soluble chitosan (LMWSC). Insulin-incorporated nanoparticles showed spherical shapes with ...

    Joung-Pyo Nam, Changyong Choi, Mi-Kyeong Jang, Young-Il Jeong… in Macromolecular Research (2010)

  9. No Access

    Article

    Methotrexate-incorporated polymeric micelles composed of methoxy poly(ethylene glycol)-grafted chitosan

    In this study, methotrexate (MTX)-encapsulated polymeric micelles using methoxy poly(ethylene glycol) (MPEG)-grafted chitosan (ChitoPEG) copolymer were prepared. The MTX-incorporated polymeric micelles of Chit...

    Young-Il Jeong, Dong-Hyuk Seo, Don-Gon Kim, Changyong Choi… in Macromolecular Research (2009)

  10. No Access

    Article

    Preparation and characterization of nanoparticles using poly(N-isopropylacrylamide)-poly(ε-caprolactone) and poly(ethylene glycol)-poly(ε-caprolactone) block copolymers with thermosensitive function

    Thermosensitive nanoparticles were prepared via the self-assembly of two different poly(ε-caprolactone)-based block copolymers of poly(N-isopropylacrylamide)-b-poly(ε-caprolactone) (PNPCL) and poly(ethylene glyco...

    Changyong Choi, Mi-Kyeong Jang, Jae-Woon Nah in Macromolecular Research (2007)

  11. No Access

    Article

    All-trans retinoic acid-associated low molecular weight water-soluble chitosan nanoparticles based on ion complex

    The purpose of this study is to develop novel nanoparticles based on polyion complex formation between low molecular weight water-soluble chitosan (LMWSC) and all-trans retinoic acid (atRA). LMWSC nanoparticles e...

    Dong-Gon Kim, Changyong Choi, Young-Il Jeong, Mi-Kyeong Jang… in Macromolecular Research (2006)

  12. No Access

    Article

    Transesterification and compatibilization in the blends of bisphenol-A polycarbonate and poly(trimethylene terephthalate)

    Melt blending of Bisphenol A polycarbonate(PC) and poly(trimethylene terephthalate)(PTT) was carried out over the entire composition range. The mixing time was varied up to 90 min. The resulting samples were a...

    Sang-Kuwon Na, Byeong-Gi Kong, Changyong Choi, Mi-Kyeong Jang… in Macromolecular Research (2005)

  13. No Access

    Article

    Preparation of a hydrophobized chitosan oligosaccharide for application as an efficient gene carrier

    To prepare chitosan-based polymeric amphiphiles that can form nanosized core-shell structures (nanoparticles) in aqueous milieu, chitosan oligosaccharides (COSs) were modified chemically with hydrophobic chole...

    Sohee Son, Su Young Chae, Changyong Choi, Myung-Yul Kim… in Macromolecular Research (2004)