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1,734 results on '"Park, Joo Hyun"'

9. A Real-Time Chart Explanation System for Visually Impaired Individuals

Author

Song, YooJeong, Jeong, SungHeon, Cho, WooJin, Lim, Soon-Bum, Park, Joo Hyun, Hartmanis, Juris, Founding Editor, van Leeuwen, Jan, Series Editor, Hutchison, David, Editorial Board Member, Kanade, Takeo, Editorial Board Member, Kittler, Josef, Editorial Board Member, Kleinberg, Jon M., Editorial Board Member, Kobsa, Alfred, Series Editor, Mattern, Friedemann, Editorial Board Member, Mitchell, John C., Editorial Board Member, Naor, Moni, Editorial Board Member, Nierstrasz, Oscar, Series Editor, Pandu Rangan, C., Editorial Board Member, Sudan, Madhu, Series Editor, Terzopoulos, Demetri, Editorial Board Member, Tygar, Doug, Editorial Board Member, Weikum, Gerhard, Series Editor, Vardi, Moshe Y, Series Editor, Goos, Gerhard, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Miesenberger, Klaus, editor, Peňáz, Petr, editor, and Kobayashi, Makato, editor

Published
2024
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32. Generative Adversarial Networks for Unsupervised Object Co-localization

Author

Choe, Junsuk, Park, Joo Hyun, and Shim, Hyunjung

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

This paper introduces a novel approach for unsupervised object co-localization using Generative Adversarial Networks (GANs). GAN is a powerful tool that can implicitly learn unknown data distributions in an unsupervised manner. From the observation that GAN discriminator is highly influenced by pixels where objects appear, we analyze the internal layers of discriminator and visualize the activated pixels. Our important finding is that high image diversity of GAN, which is a main goal in GAN research, is ironically disadvantageous for object localization, because such discriminators focus not only on the target object, but also on the various objects, such as background objects. Based on extensive evaluations and experimental studies, we show the image diversity and localization performance have a negative correlation. In addition, our approach achieves meaningful accuracy for unsupervised object co-localization using publicly available benchmark datasets, even comparable to state-of-the-art weakly-supervised approach.

Published
2018

33. Improved Techniques For Weakly-Supervised Object Localization

Author

Choe, Junsuk, Park, Joo Hyun, and Shim, Hyunjung

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

We propose an improved technique for weakly-supervised object localization. Conventional methods have a limitation that they focus only on most discriminative parts of the target objects. The recent study addressed this issue and resolved this limitation by augmenting the training data for less discriminative parts. To this end, we employ an effective data augmentation for improving the accuracy of the object localization. In addition, we introduce improved learning techniques by optimizing Convolutional Neural Networks (CNN) based on the state-of-the-art model. Based on extensive experiments, we evaluate the effectiveness of the proposed approach both qualitatively and quantitatively. Especially, we observe that our method improves the Top-1 localization accuracy by 21.4 - 37.3% depending on configurations, compared to the current state-of-the-art technique of the weakly-supervised object localization., Comment: Submitted to BMVC 2018

Published
2018

49. A Case of Nasal Cavity and Laryngeal Involvement of Rosai–Dorfman Disease.

Author

Lee, Changhee, Choi, Nayeon, Lee, Yurimi, Park, Joo Hyun, and Son, Young-Ik

Subjects
DIAGNOSIS of dyspnea, NASAL cavity, LARYNGEAL tumors, RARE diseases, FEVER, HISTIOCYTOSIS, LYMPHATIC diseases, BIOMARKERS
Abstract

Rosai–Dorfman disease (RDD) is a rare non-malignant disorder, characterized by painless multiple cervical lymphadenopathy, fever, and elevated inflammatory markers. Its diagnosis is difficult due to its rare incidence and various clinical presentations, especially in extranodal involvement. In this report, we demonstrate a patient with RDD who presented with a nasal septum and laryngeal tumor that caused dyspnea. We achieved a successful treatment outcome with combined surgical resection of the laryngeal mass and corticosteroid medication. The symptoms and tumors were resolved within 3 weeks after treatment. We reported our experiences with review of literatures. [ABSTRACT FROM AUTHOR]

Published
2024
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