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54. Short- and long-term neuropsychiatric outcomes in long COVID in South Korea and Japan

Author

Kim, Sunyoung, Lee, Hayeon, Lee, Jinseok, Lee, Seung Won, Kwon, Rosie, Kim, Min Seo, Koyanagi, Ai, Smith, Lee, Fond, Guillaume, Boyer, Laurent, Rahmati, Masoud, López Sánchez, Guillermo F., Dragioti, Elena, Cortese, Samuele, Shin, Ju-Young, Choi, Ahhyung, Suh, Hae Sun, Lee, Sunmi, Solmi, Marco, Min, Chanyang, Shin, Jae Il, Yon, Dong Keon, and Fusar-Poli, Paolo

Published
2024
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55. Mitochondrial DNA mosaicism in normal human somatic cells

Author

An, Jisong, Nam, Chang Hyun, Kim, Ryul, Lee, Yunah, Won, Hyein, Park, Seongyeol, Lee, Won Hee, Park, Hansol, Yoon, Christopher J., An, Yohan, Kim, Jie-Hyun, Jun, Jong Kwan, Bae, Jeong Mo, Shin, Eui-Cheol, Kim, Bun, Cha, Yong Jun, Kwon, Hyun Woo, Oh, Ji Won, Park, Jee Yoon, Kim, Min Jung, and Ju, Young Seok

Published
2024
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61. On $p$-adic Hurwitz-type spectral zeta functions

Author

Hu, Su and Kim, Min-Soo

Subjects
Mathematics - Number Theory, Mathematical Physics, Mathematics - Classical Analysis and ODEs, Primary 11M35, 11S80, Secondary 11B68, 81Q10
Abstract

Let $\left\{E_n\right\}_{n=1}^{\infty}$ be the set of energy levels corresponding to a Hamiltonian $H$. Denote by $$\lambda_{0}=0~~\textrm{and}~~\lambda_{n}=E_{n}$$ for $n\in\mathbb N.$ In this paper, we shall construct and investigate the $p$-adic counterparts of the Hurwitz-type spectral zeta function \begin{equation} \zeta^{H}(s,\lambda)=\sum_{n=0}^{\infty}\frac{1}{(\lambda_{n}+\lambda)^{s}} \end{equation} and its alternating form \begin{equation} \zeta_{E}^{H}(s,\lambda)=2\sum_{n=0}^{\infty}\frac{(-1)^{n}}{(\lambda_{n}+\lambda)^{s}} \end{equation} in a parallel way., Comment: 20 pages

Published
2024

62. Surface control of Ni-Al2O3 dry reforming of methane catalyst by composition segregation

Author

Kim, Min-Jae, Kim, Jeongmin, Kim, Yong Jun, Youn, Jae-Rang, Kim, Dong Hyun, Shapiro, David, Guo, Jinghua, and Lee, Kyubock

Subjects
Chemical Engineering, Engineering, Inorganic Chemistry, Chemical engineering
Abstract

Catalyst surface control is of great importance considering that a catalytic reaction initially starts with surface atoms’ interaction with reactant molecules. In the present study, we synthesized the Ni-Al2O3 dry reforming of methane (DRM) catalyst via the spray-pyrolysis-assisted evaporation-induced self-assembly (EISA) method in order to systematically investigate catalyst surface change as controlled by composition segregation. The present results showed that segregation in the Ni-Al2O3 catalyst had successfully occurred by the post-annealing process and that the segregated Ni nanoparticles were located on the catalyst surface with simultaneous reduction to metal. The size of the surface Ni nanoparticles was highly dependent on the post-annealing temperature, whereas the electronic properties did not consistently align with the trend of particle-size growth, indicating that the particle-growth mechanism underwent alterations from segregation to sintering as the temperature was increased. In other words, when the reduction temperature for metal segregation is excessively high, particle-growth on the external catalyst surface, as induced by post-annealing, is primarily attributable to particle sintering rather than to metal segregation. This phenomenon directly results in decreased Ni surface density. The catalytic DRM reaction revealed that due to sintering, the catalytic performance did not align with the trend of Ni particle-size growth, and the conversion of CH4/CO2 was closely associated with Ni surface density. This information will offer valuable insight to future research focused on development of Ni-based catalysts for DRM reactions.

Published
2024

63. Cell type-specific roles of APOE4 in Alzheimer disease.

Author

Blumenfeld, Jessica, Yip, Oscar, Kim, Min, and Huang, Yadong

Subjects
Animals, Alzheimer Disease, Apolipoprotein E4, Neurons, Neuroglia, Astrocytes
Abstract

The ɛ4 allele of the apolipoprotein E gene (APOE), which translates to the APOE4 isoform, is the strongest genetic risk factor for late-onset Alzheimer disease (AD). Within the CNS, APOE is produced by a variety of cell types under different conditions, posing a challenge for studying its roles in AD pathogenesis. However, through powerful advances in research tools and the use of novel cell culture and animal models, researchers have recently begun to study the roles of APOE4 in AD in a cell type-specific manner and at a deeper and more mechanistic level than ever before. In particular, cutting-edge omics studies have enabled APOE4 to be studied at the single-cell level and have allowed the identification of critical APOE4 effects in AD-vulnerable cellular subtypes. Through these studies, it has become evident that APOE4 produced in various types of CNS cell - including astrocytes, neurons, microglia, oligodendrocytes and vascular cells - has diverse roles in AD pathogenesis. Here, we review these scientific advances and propose a cell type-specific APOE4 cascade model of AD. In this model, neuronal APOE4 emerges as a crucial pathological initiator and driver of AD pathogenesis, instigating glial responses and, ultimately, neurodegeneration. In addition, we provide perspectives on future directions for APOE4 research and related therapeutic developments in the context of AD.

Published
2024

64. Universal Syntactic Structures: Modeling Syntax for Various Natural Languages

Author

Kim, Min K., Takero, Hafu, and Fedovik, Sara

Subjects
Computer Science - Computation and Language
Abstract

We aim to provide an explanation for how the human brain might connect words for sentence formation. A novel approach to modeling syntactic representation is introduced, potentially showing the existence of universal syntactic structures for all natural languages. As the discovery of DNA's double helix structure shed light on the inner workings of genetics, we wish to introduce a basic understanding of how language might work in the human brain. It could be the brain's way of encoding and decoding knowledge. It also brings some insight into theories in linguistics, psychology, and cognitive science. After looking into the logic behind universal syntactic structures and the methodology of the modeling technique, we attempt to analyze corpora that showcase universality in the language process of different natural languages such as English and Korean. Lastly, we discuss the critical period hypothesis, universal grammar, and a few other assertions on language for the purpose of advancing our understanding of the human brain., Comment: 22 pages, 9 figures

Published
2023

65. A note on rational band moves

Author

Chen, Daren, Hom, Jennifer, Kim, Min Hoon, Park, JungHwan, and Wu, Zhongtao

Subjects
Mathematics - Geometric Topology
Abstract

We introduce an oriented rational band move, a generalization of an ordinary oriented band move, and show that if a knot $K$ in the three-sphere can be made into the $(n+1)$-component unlink by $n$ oriented rational band moves, then $K$ is rationally slice.

Published
2023

66. Properties of Nb\_xTi\_{(1-x)}N thin films deposited on 300 mm silicon wafers for upscaling superconducting digital circuits

Author

Lozano, Daniel Pérez, Soulié, Jean-Philippe, Hodges, Blake, Piao, Xiaoyu, O'Neal, Sabine, Valente-Feliciano, Anne-Marie, Herr, Quentin, Tőkei, Zsolt, Kim, Min-Soo, and Herr, Anna

Subjects
Condensed Matter - Superconductivity
Abstract

Scaling superconducting digital circuits requires fundamental changes in the current material set and fabrication process. The transition to 300 mm wafers and the implementation of advanced lithography are instrumental in facilitating mature CMOS processes, ensuring uniformity, and optimizing the yield. This study explores the properties of NbxTi(1-x)N films fabricated by magnetron DC sputtering on 300 mm Si wafers. As a promising alternative to traditional Nb in device manufacturing, NbxTi(1-x)N offers numerous advantages, including enhanced stability and scalability to smaller dimensions, in both processing and design. As a ternary material, NbxTi(1-x)N allows engineering material parameters by changing deposition conditions. The engineered properties can be used to modulate device parameters through the stack and mitigate failure modes. We report characterization of NbxTi(1-x)N films at less than 2% thickness variability, 2.4% Tc variability and 3% composition variability. The films material properties such as resistivity (140-375 {\Omega}cm) and critical temperature Tc (4.6 K - 14.1 K) are correlated with stoichiometry and morphology of the films. Our results highlight the significant influence of deposition conditions on crystallographic texture along the films and its correlation with Tc., Comment: 8 pages 8 figures

Published
2023
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68. Severe Human Parainfluenza Virus Community- and Healthcare-Acquired Pneumonia in Adults at Tertiary Hospital, Seoul, South Korea, 2010-2019

Author

Park, Joung Ha, Hong, Sang-Bum, Huh, Jin Won, Jung, Jiwon, Kim, Min Jae, Chong, Yong Pil, Sung, Heungsup, Do, Kyung Hyun, Kim, Sung-Han, Lee, Sang-Oh, Kim, Yang Soo, Lim, Chae-Man, Koh, Younsuck, and Choi, Sang-Ho

Subjects
Medical research, Medicine, Experimental, Bacterial pneumonia -- Development and progression -- Care and treatment, Cross infection -- Prevention, Influenza -- Complications and side effects -- Care and treatment, Pneumonia -- Development and progression -- Care and treatment, Nosocomial infections -- Prevention, Health, Care and treatment, Prevention, Complications and side effects, Development and progression
Abstract

Human parainfluenza virus (HPIV) is a major cause of acute respiratory tract infections, such as croup in children and pneumonia in immunocompromised patients (1). HPIV is a single-stranded, enveloped RNA [...]

Published
2024
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69. Identifying Contact Time Required for Secondary Transmission of Clostridioides difficile Infections by Using Real-Time Locating System

Author

Kim, Min Hyung, Kim, Jaewoong, Ra, Heejin, Jeong, Sooyeon, Park, Yoon Soo, Won, Dongju, Lee, Hyukmin, and Kim, Heejung

Subjects
Wireless communication systems -- Usage, Clostridium infections -- Risk factors, Cross infection -- Risk factors, Mobile communication systems -- Usage, Nosocomial infections -- Risk factors, Disease transmission -- Risk factors, Wireless technology, Health
Abstract

Mitigating the incidence of Clostridioides difficile infections (CDIs), particularly those acquired in healthcare settings, has received increased attention because of the notable prevalence of this contagion (2,2). Although the incidence [...]

Published
2024
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70. Using Natural Language Processing to Analyze Elementary Teachers' Mathematical Pedagogical Content Knowledge in Online Community of Practice

Author

Yoo, Jiseung and Kim, Min Kyeong

Abstract

This study focuses on how teachers' pedagogical content knowledge (PCK) of mathematics may differ depending on teacher interactions in an online teacher community of practice (CoP). The study utilizes data from 26,857 posts collected from the South Korean self-generated online teacher CoP, 'Indischool'. This data was then analyzed using natural language processing techniques; specifically, text classification with word2vec, BERT, and machine learning classifiers was used. The results indicate that the texts of posts can predict the level of teacher interactions in the online CoP. BERT embedding and classifier exhibited the best performance, ultimately achieving an F1 score of 0.756. Moreover, topic modeling utilizing BERT embedding is used to uncover the specific PCK of teachers through high- and low-interaction posts. The results reveal that high-interaction posts with numerous likes and replies demonstrate more in-depth reflections on teaching mathematics and refined PCK. This study makes two significant contributions. First, it applies a data science framework that allows for the analysis of real data from an actual online teacher community. Secondly, it sheds light on the intricacies of knowledge management in an online teacher CoP, an area that has to this point received limited empirical attention.

Published
2023

72. Balloon-expandable cobalt chromium stent versus self-expandable nitinol stent for the Atherosclerotic Iliac Arterial Disease (SENS-ILIAC Trial) Trial: a randomized controlled trial

Author

Choi, Woong Gil, Rha, Seung-Woon, Choi, Byoung Geol, Park, Soohyung, Kim, Ji Bak, Kang, Dong Oh, Choi, Cheol Ung, Seo, Yong Sung, Cho, Yoon Hyung, Park, Sang Ho, Lee, Seung Jin, Ko, Young Guk, Her, Ae-Young, Kim, Sang Min, Kim, Ki Chang, Cho, Jang Hyun, Kang, Won Yu, Kim, Joo Han, Kim, Min Woong, Kim, Do Hoi, Bae, Jang Ho, Ahn, Ji Hoon, Jo, Sang Cheol, Seo, Jae Bin, Jung, Woo Young, and Park, Sang Min

Published
2024
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