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15,323 results on '"Choi, Sung In"'

1. Overlap chronic GVHD is associated with adverse survival outcomes compared to classic chronic GVHD.

Author

Gorfinkel, Lev, Raghunandan, Sharmila, Watkins, Benjamin, Hebert, Kyle, Neuberg, Donna, Bratrude, Brandi, Betz, Kayla, Yu, Alison, Choi, Sung, Davis, Jeffrey, Duncan, Christine, Giller, Roger, Grimley, Michael, Harris, Andrew, Jacobsohn, David, Lalefar, Nahal, Farhadfar, Nosha, Pulsipher, Michael, Shenoy, Shalini, Petrovic, Aleksandra, Schultz, Kirk, Yanik, Gregory, Blazar, Bruce, Horan, John, Langston, Amelia, Kean, Leslie, and Qayed, Muna

Subjects
Humans, Graft vs Host Disease, Male, Female, Chronic Disease, Adult, Middle Aged, Disease-Free Survival, Hematopoietic Stem Cell Transplantation, Survival Rate, Aged
Abstract

Chronic graft-versus-host-disease (cGVHD) is divided into two subtypes: classic (absence of acute GVHD features) and overlap cGVHD (ocGVHD), in which both chronic and acute GVHD clinical features are present simultaneously. While worse outcomes with ocGVHD have been reported, there are few recent analyses. We performed a secondary analysis of data from the ABA2 trial (N = 185), in which detailed GVHD data were collected prospectively and systematically adjudicated. Analyses included cumulative incidence of classic versus ocGVHD, their specific organ manifestations, global disease severity scores, non-relapse mortality (NRM), disease-free survival (DFS) and overall survival (OS) in these two cGVHD subtypes. Of 92 patients who developed cGVHD, 35 were classified as ocGVHD. The 1-year cumulative incidence, organ involvement, and global severity of classic and ocGVHD were similar between ABA2 patients receiving CNI/MTX+placebo and CNI/MTX+abatacept; thus, cohorts were combined for ocGVHD evaluation. This analysis identified ocGVHD as having significantly higher severity at presentation and at maximum global severity compared to classic cGVHD. OS and DFS were significantly lower for ocGVHD versus classic cGVHD. OcGVHD is associated with increased cGVHD severity scores, and is associated with decreased OS and DFS compared to classic cGVHD, underscoring the high risks with this cGVHD subtype.

Published
2024

2. Matrix-based Prediction Approach for Intraday Instantaneous Volatility Vector

Author

Choi, Sung Hoon and Kim, Donggyu

Subjects
Economics - Econometrics
Abstract

In this paper, we introduce a novel method for predicting intraday instantaneous volatility based on Ito semimartingale models using high-frequency financial data. Several studies have highlighted stylized volatility time series features, such as interday auto-regressive dynamics and the intraday U-shaped pattern. To accommodate these volatility features, we propose an interday-by-intraday instantaneous volatility matrix process that can be decomposed into low-rank conditional expected instantaneous volatility and noise matrices. To predict the low-rank conditional expected instantaneous volatility matrix, we propose the Two-sIde Projected-PCA (TIP-PCA) procedure. We establish asymptotic properties of the proposed estimators and conduct a simulation study to assess the finite sample performance of the proposed prediction method. Finally, we apply the TIP-PCA method to an out-of-sample instantaneous volatility vector prediction study using high-frequency data from the S&P 500 index and 11 sector index funds.

Published
2024

3. On existence of bounded relative-global complements for Fano fibrations

Author

Choi, Sung Rak and Zhou, Chuyu

Subjects
Mathematics - Algebraic Geometry
Abstract

For Fano fibrations with $\epsilon$-lc singularities of a fixed dimension, we show the existence of bounded relative-global complements. If the base of the fibration is of dimension one, we even show the existence of bounded relative-global klt complements., Comment: 15 pages

Published
2024

7. Factors Associated with and Impact of Open Conversion in Laparoscopic and Robotic Minor Liver Resections: An International Multicenter Study of 10,541 Patients

Author

Saleh, Mansour, Pascual, Franco, Ghallab, Mohammed, Wu, Andrew G. R., Chin, Ken-Min, Ratti, Francesca, Giglio, Mariano Cesare, Garatti, Marco, Nghia, Phan Phuoc, Kato, Yutaro, Lim, Chetana, Herman, Paulo, Coelho, Fabricio Ferreira, Schmelzle, Moritz, Pratschke, Johann, Aghayan, Davit L., Liu, Qiu, Marino, Marco V., Belli, Andrea, Chiow, Adrian K. H., Sucandy, Iswanto, Ivanecz, Arpad, Di Benedetto, Fabrizio, Choi, Sung Hoon, Lee, Jae Hoon, Park, James O., Prieto, Mikel, Guzman, Yoelimar, Fondevila, Constantino, Efanov, Mikhail, Rotellar, Fernando, Choi, Gi-Hong, Robles-Campos, Ricardo, Kadam, Prashant, Sutcliffe, Robert P., Troisi, Roberto I., Tang, Chung Ngai, Chong, Charing C., D’Hondt, Mathieu, Dalla Valle, Bernardo, Ruzzenente, Andrea, Kingham, T. Peter, Scatton, Olivier, Liu, Rong, Mejia, Alejandro, Mishima, Kohei, Wakabayashi, Go, Lopez-Ben, Santiago, Wang, Xiaoying, Ferrero, Alessandro, Ettorre, Giuseppe Maria, Vivarelli, Marco, Mazzaferro, Vincenzo, Giuliante, Felice, Yong, Chee Chien, Yin, Mengqiu, Monden, Kazuteru, Geller, David, Chen, Kuo-Hsin, Sugioka, Atsushi, Edwin, Bjørn, Cheung, Tan-To, Long, Tran Cong Duy, Abu Hilal, Mohammad, Aldrighetti, Luca, Soubrane, Olivier, Fuks, David, Han, Ho-Seong, Cherqui, Daniel, and Goh, Brian K. P.

Published
2024
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11. Adjoint asymptotic multiplier ideal sheaves

Author

Choi, Sung Rak, Jang, Sungwook, and Kim, Donghyeon

Subjects
Mathematics - Algebraic Geometry
Abstract

In this paper, we initiate the study of a triple $(X,\Delta,D)$ which consists of a pair $(X,\Delta)$ and a polarizing pseudoeffective divisor $D$. The adjoint asymptotic multiplier ideal sheaf $\mathcal{J}(X,\Delta;\lVert D \rVert)$ associated to the triple gives a simultaneous generalization of the multiplier ideal sheaf $\mathcal{J}(D)$ and asymptotic multiplier ideal sheaf $\mathcal{J}(\lVert D \rVert)$. We describe the closed set defined by the ideal sheaf $\mathcal{J}(X,\Delta;\lVert D \rVert)$ in terms of the minimal model program. We also characterize the case where $\mathcal{J}(X,\Delta;\lVert D \rVert)=\mathcal{O}_X$. Lastly, we also prove a Nadel type vanishing theorem of cohomology using $\mathcal{J}(X,\Delta;\lVert D \rVert)$.

Published
2023

19. Dyadic Reinforcement Learning

Author

Li, Shuangning, Niell, Lluis Salvat, Choi, Sung Won, Nahum-Shani, Inbal, Shani, Guy, and Murphy, Susan

Subjects
Computer Science - Machine Learning, Statistics - Applications, Statistics - Machine Learning
Abstract

Mobile health aims to enhance health outcomes by delivering interventions to individuals as they go about their daily life. The involvement of care partners and social support networks often proves crucial in helping individuals managing burdensome medical conditions. This presents opportunities in mobile health to design interventions that target the dyadic relationship -- the relationship between a target person and their care partner -- with the aim of enhancing social support. In this paper, we develop dyadic RL, an online reinforcement learning algorithm designed to personalize intervention delivery based on contextual factors and past responses of a target person and their care partner. Here, multiple sets of interventions impact the dyad across multiple time intervals. The developed dyadic RL is Bayesian and hierarchical. We formally introduce the problem setup, develop dyadic RL and establish a regret bound. We demonstrate dyadic RL's empirical performance through simulation studies on both toy scenarios and on a realistic test bed constructed from data collected in a mobile health study.

Published
2023

21. Large Global Volatility Matrix Analysis Based on Observation Structural Information

Author

Choi, Sung Hoon and Kim, Donggyu

Subjects
Economics - Econometrics
Abstract

In this paper, we develop a novel large volatility matrix estimation procedure for analyzing global financial markets. Practitioners often use lower-frequency data, such as weekly or monthly returns, to address the issue of different trading hours in the international financial market. However, this approach can lead to inefficiency due to information loss. To mitigate this problem, our proposed method, called Structured Principal Orthogonal complEment Thresholding (Structured-POET), incorporates observation structural information for both global and national factor models. We establish the asymptotic properties of the Structured-POET estimator, and also demonstrate the drawbacks of conventional covariance matrix estimation procedures when using lower-frequency data. Finally, we apply the Structured-POET estimator to an out-of-sample portfolio allocation study using international stock market data.

Published
2023

23. Semi-automatic Construction of Bidirectional Dialogue Dataset for Dialogue-Based Reading Comprehension Tutoring System Using Generative AI

Author

Choi, Sung-Kwon, Huang, Jin-Xia, Kwon, Oh-Woog, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Sifaleras, Angelo, editor, and Lin, Fuhua, editor

Published
2024
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30. Histopathologic image–based deep learning classifier for predicting platinum-based treatment responses in high-grade serous ovarian cancer

Author

Ahn, Byungsoo, Moon, Damin, Kim, Hyun-Soo, Lee, Chung, Cho, Nam Hoon, Choi, Heung-Kook, Kim, Dongmin, Lee, Jung-Yun, Nam, Eun Ji, Won, Dongju, An, Hee Jung, Kwon, Sun Young, Shin, Su-Jin, Jung, Hye Ra, Kwon, Dohee, Park, Heejung, Kim, Milim, Cha, Yoon Jin, Park, Hyunjin, Lee, Yangkyu, Noh, Songmi, Lee, Yong-Moon, Choi, Sung-Eun, Kim, Ji Min, Sung, Sun Hee, and Park, Eunhyang

Published
2024
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33. Sex differences in in-hospital management in patients with sepsis and septic shock: a prospective multicenter observational study

Author

Ahn, Sejoong, Jin, Bo-Yeong, Lee, Sukyo, Kim, Sungjin, Moon, Sungwoo, Cho, Hanjin, Han, Kap Su, Jo, You Hwan, Kim, Kyuseok, Shin, Jonghwan, Suh, Gil Joon, Kwon, Woon Yong, Shin, Tae Gun, Choi, Han Sung, Choi, Sangchun, Park, Yoo Seok, Chung, Sung Phil, Kim, Won Young, Ahn, Hong Joon, Lim, Tae Ho, Choi, Sung-Hyuk, and Park, Jong-Hak

Published
2024
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39. Reliability Exercise of Ultrasound Salivary Glands in Sjögren’s Disease: An International Web Training Initiative

Author

Quéré, Baptiste, Saraux, Alain, Carvajal-Alegria, Guillermo, Guellec, Dewi, Mouterde, Gaël, Lamotte, Christophe, Hammenfors, Daniel, Jonsson, Malin, Choi, Sung-Eun, Hong-Ki, Min, Stel, Alja, Fisher, Benjamin A., Maybury, Mark, Hofauer, Benedikt, Ferro, Francesco, Milic, Vera, Direnzo, Dana, Devauchelle-Pensec, Valérie, and Jousse-Joulin, Sandrine

Published
2024
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43. Impact of Liver Cirrhosis, Severity of Cirrhosis, and Portal Hypertension on the Difficulty and Outcomes of Laparoscopic and Robotic Major Liver Resections for Primary Liver Malignancies

Author

Cipriani, Federica, Aldrighetti, Luca, Ratti, Francesca, Wu, Andrew G. R., Kabir, Tousif, Scatton, Olivier, Lim, Chetana, Zhang, Wanguang, Sijberden, Jasper, Aghayan, Davit L., Siow, Tiing-Foong, Dokmak, Safi, Coelho, Fabricio Ferreira, Herman, Paulo, Marino, Marco V., Mazzaferro, Vincenzo, Chiow, Adrian K. H., Sucandy, Iswanto, Ivanecz, Arpad, Choi, Sung-Hoon, Lee, Jae Hoon, Gastaca, Mikel, Vivarelli, Marco, Giuliante, Felice, Ruzzenente, Andrea, Yong, Chee-Chien, Yin, Mengqiu, Fondevila, Constantino, Efanov, Mikhail, Morise, Zenichi, Di Benedetto, Fabrizio, Brustia, Raffaele, Dalla Valle, Raffaele, Boggi, Ugo, Geller, David, Belli, Andrea, Memeo, Riccardo, Gruttadauria, Salvatore, Mejia, Alejandro, Park, James O., Rotellar, Fernando, Choi, Gi-Hong, Robles-Campos, Ricardo, Wang, Xiaoying, Sutcliffe, Robert P., Pratschke, Johann, Lai, Eric C. H., Chong, Charing C. N., D’Hondt, Mathieu, Monden, Kazuteru, Lopez-Ben, Santiago, Kingham, T. Peter, Ferrero, Alessandro, Ettorre, Giuseppe Maria, Cherqui, Daniel, Liang, Xiao, Soubrane, Olivier, Wakabayashi, Go, Troisi, Roberto I., Cheung, Tan-To, Kato, Yutaro, Sugioka, Atsushi, Han, Ho-Seong, Long, Tran Cong duy, Liu, Qu, Liu, Rong, Edwin, Bjørn, Fuks, David, Chen, Kuo-Hsin, Abu Hilal, Mohammad, and Goh, Brian K. P.

Published
2024
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45. ACC of plc thresholds

Author

Choi, Sung Rak and Jang, Sungwook

Subjects
Mathematics - Algebraic Geometry
Abstract

In this paper, we define potential log canonical threshold and prove that the set of those thresholds satisfies the ascending chain condition (ACC). We also consider collections of sequences of Fano type varieties and we study their basic properties including boundedness.

Published
2022

46. Large Volatility Matrix Analysis Using Global and National Factor Models

Author

Choi, Sung Hoon and Kim, Donggyu

Subjects
Economics - Econometrics
Abstract

Several large volatility matrix inference procedures have been developed, based on the latent factor model. They often assumed that there are a few of common factors, which can account for volatility dynamics. However, several studies have demonstrated the presence of local factors. In particular, when analyzing the global stock market, we often observe that nation-specific factors explain their own country's volatility dynamics. To account for this, we propose the Double Principal Orthogonal complEment Thresholding (Double-POET) method, based on multi-level factor models, and also establish its asymptotic properties. Furthermore, we demonstrate the drawback of using the regular principal orthogonal component thresholding (POET) when the local factor structure exists. We also describe the blessing of dimensionality using Double-POET for local covariance matrix estimation. Finally, we investigate the performance of the Double-POET estimator in an out-of-sample portfolio allocation study using international stocks from 20 financial markets.

Published
2022

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