3,890 results on '"Yim A"'
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2. Boosting Infrared Photoresponse of a Cartridge-Type Modular Photodetector Based on Two-Dimensional Tin Monoselenide via Up-Conversion Particle-Stimulated Light Management.
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Jo, Hyeong-ku, Ji, Seulgi, Lee, Do Hyung, Lim, Min Hyeok, Song, Da Som, Park, Seoungwoong, Kang, Saewon, Yim, Soonmin, Myung, Sung, Lim, Jongsun, Kim, Ki Kang, Lee, Sun Sook, and Song, Wooseok
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- 2025
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3. 1H NMR Trajectories for Analyzing the Growth and Purification of 2D Polyaramids.
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Wei, Zitang, Tu, Yu-Ming, Yim, Wonjun, Quien, Michelle, Alizadehmojarad, Ali A., Gong, Xun, and Strano, Michael S.
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- 2025
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4. Psychological resilience of small tourism business entrepreneurs in times of crisis through the lens of compensatory control theory.
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Wan, Yim King Penny
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COVID-19 pandemic ,BUSINESSPEOPLE ,SMALL business ,PANDEMICS ,CRISES - Abstract
Guided by the psychological resilience perspective and compensatory control theory, this study examined the psychological resilience of small tourism business (STB) entrepreneurs during the COVID-19 outbreak between January 2020 and April 2023. Qualitative face-to-face interviews with 21 entrepreneurs of STBs in Macao, China were conducted. The findings showed that entrepreneurs faced different stages of uncertainty during the pandemic, which led them to draw on various personal and external resources in their compensatory control strategies. Also, the types of resources the entrepreneurs drew on varied depending on their degree of control over the uncertainties in various stages. When a certain degree of control was improved, entrepreneurs' reliance on particular types of resources would decrease, and vice versa. This study contributed a novel approach to examining the psychological resilience of small business entrepreneurs during the pandemic, especially the various stages of uncertainty they faced, and the compensatory control strategies they adopted. In addition, this study highlighted the importance of understanding the dynamic between one's degree of control over uncertainties and the use of personal and external resources. Practical suggestions were also given to the relevant stakeholders for ways to provide timely and appropriate assistance to the STBs. [ABSTRACT FROM AUTHOR]
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- 2025
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5. Two new compounds from Apiospora xenocordella culture medium and their inhibitory effects on TNF-α-induced ROS generation and MMP-1 secretion.
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Kwon, Haeun, Ann, Hee Woon, Lee, Jin Su, Kwon, Jaeyoung, Park, Keunwan, Guo, Yuanqiang, Hwang, Bang Yeon, Kim, Jae-Jin, Yim, Joung Han, Kim, Il-Chan, Jang, Dae Sik, Lee, Sullim, and Lee, Dongho
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A new cytosporin derivative (1) and a new phenolic compound (2), together with cytosporin D (3), were isolated from an EtOAc extract of Apiospora xenocordella culture medium. The isolation workflow was guided by a Molecular Networking-based dereplication strategy. The chemical structures of the new compounds were determined by using MS and NMR spectroscopic techniques, and the absolute configurations were established by the modified Mosher's method and quantum chemical calculation of electronic circular dichroism. UV radiation activates pro-inflammatory cytokines, such as TNF-α, a major contributor to skin aging through ROS generation and MMP-1 secretion. Cytosporin D (3) exhibited the inhibition of TNF-α-induced ROS and MMP-1. UV radiation activates pro-inflammatory cytokines including TNF-α which is a major contributor to skin aging through reactive oxygen species (ROS) generation and matrix metalloproteinase-1 (MMP-1) secretion. Cytosporin D (3) exhibited moderate inhibition against TNF-α-induced ROS and MMP-1. This compound docked computationally into the active site of MMP-1 (−5.9 kcal/mol). Compound 1 , though not tested due to limited quantity, showed a docking simulation result (−6.0 kcal/mol) similar to cytosporin D (3), indicating potential activity. [Display omitted] • Two new compounds were isolated from Apiospora xenocordella culture medium. • The isolation workflow was guided by a Molecular Networking-based dereplication strategy. • Cytosporin D (3) exhibited inhibition of TNF-α-induced ROS and MMP-1. [ABSTRACT FROM AUTHOR]
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- 2025
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6. Real-world validation of the Khorana risk score in gastric cancer patients receiving immune checkpoint inhibitors.
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Song, Junmin, Li, Wing Fai, Yim, Chaeseong, Gong, Changlin, Chang, Yu-Cheng, Chang, Yu, Ahn, Jaeun, Chi, Kuan-Yu, Fahimuddin, Muhammad, and Chiang, Cho Han
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- 2025
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7. Synergistic Effect of Polyglycerol and DMSO for Long-Term Cryopreservation of Stichococcus Species.
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Shin, Aram, Choi, Seong Ryeol, Yim, Jun Ho, Chung, Eu Jin, Nam, Seung Won, Burns, Brendan P., Jeon, Young Jae, and Kim, Byeong-Su
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- 2025
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8. First report of iron-overload myopathy due to secondary hemochromatosis in a dog.
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Jae-Hyuk Yim, Tae-Un Kim, Woo Jun Kim, Seulgi Bae, Sungho Yun, Su-Min Baek, and Jin-Kyu Park
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IRON overload ,IRON ores ,FEMALE dogs ,HEMOCHROMATOSIS ,HEPATOMEGALY ,MYOSITIS - Abstract
Importance: Hemochromatosis is rare in domestic animals, and iron-induced myopathy has not been reported in veterinary medicine. This case is the first report of iron-overload myopathy owing to hemochromatosis in a dog. Case presentation: A 9-year-old spayed female Donggyeong dog presented with severe forelimb lameness. Necropsy revealed an enlarged liver and hemorrhagic lesions in the forelimb muscle. Microscopy showed iron components accumulation in multiple organs, including the liver, forelimb skeletal muscle, spleen, lymph node, and kidney. Prussian blue staining identified iron deposits in both macrophages and parenchymal cells, indicating that the iron accumulation was acquired rather than hereditary. Furthermore, iron components were observed within muscle fibers, accompanied by severe atrophy and myositis. Conclusions and Relevance: Severe necrosis and mild fibrosis were observed in the liver and forelimb skeletal muscles. Based on histological analysis, we diagnosed iron overload myopathy by secondary hemochromatosis. Secondary hemochromatosis with severe muscle atrophy and myositis is very rare, and this is the first report of iron-overload myopathy in a dog. [ABSTRACT FROM AUTHOR]
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- 2025
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9. Vibrational weak and strong coupling modify a chemical reaction via cavity-mediated radiative energy transfer
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Brawley, Zachary T., Pannir-Sivajothi, Sindhana, Yim, Ju Eun, Poh, Yong Rui, Yuen-Zhou, Joel, and Sheldon, Matthew
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Controlling reaction outcomes through external influences is a central goal in chemistry. Vibrational coupling between molecular vibrations and cavity modes is rapidly emerging as a distinct strategy compared with conventional thermochemical and photochemical methods; however, insight into the fundamental mechanisms remains limited. Here we investigate how vibrational weak and strong coupling in plasmonic nanocavities modifies the thermal dehydration of copper sulfate pentahydrate. We demonstrate that light–matter coupling reduces the onset temperature for dehydration by up to 14 °C, and we attribute this effect to enhanced radiative energy transport that is mediated by resonant electromagnetic modes, eliminating temperature gradients in the coupled system. Our findings provide direct evidence of localized energy transfer leading to modified chemical behaviour in specific regions of high optical density of states. This work establishes a mechanism for modifying thermally driven chemical processes using optical cavities, with implications for the development of catalytic systems that exploit these tailored interactions to achieve targeted reaction control.
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- 2025
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10. Artificial intelligence (AI) learning tools in K-12 education: A scoping review
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Yim, Iris Heung Yue and Su, Jiahong
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Artificial intelligence (AI) literacy is a global strategic objective in education. However, little is known about how AI should be taught. In this paper, 46 studies in academic conferences and journals are reviewed to investigate pedagogical strategies, learning tools, assessment methods in AI literacy education in K-12 contexts, and students’ learning outcomes. The investigation reveals that the promotion of AI literacy education has seen significant progress in the past two decades. This highlights that intelligent agents, including Google’s Teachable Machine, Learning ML, and Machine Learning for Kids, are age-appropriate tools for AI literacy education in K-12 contexts. Kindergarten students can benefit from learning tools such as PopBots, while software devices, such as Scratch and Python, which help to develop the computational thinking of AI algorithms, can be introduced to both primary and secondary schools. The research shows that project-based, human–computer collaborative learning and play- and game-based approaches, with constructivist methodologies, have been applied frequently in AI literacy education. Cognitive, affective, and behavioral learning outcomes, course satisfaction and soft skills acquisition have been reported. The paper informs educators of appropriate learning tools, pedagogical strategies, assessment methodologies in AI literacy education, and students’ learning outcomes. Research implications and future research directions within the K-12 context are also discussed.
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- 2025
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11. Boosting Infrared Photoresponse of a Cartridge-Type Modular Photodetector Based on Two-Dimensional Tin Monoselenide via Up-Conversion Particle-Stimulated Light Management
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Jo, Hyeong-ku, Ji, Seulgi, Lee, Do Hyung, Lim, Min Hyeok, Song, Da Som, Park, Seoungwoong, Kang, Saewon, Yim, Soonmin, Myung, Sung, Lim, Jongsun, Kim, Ki Kang, Lee, Sun Sook, and Song, Wooseok
- Abstract
In this study, we devised an innovative cartridge-type modular photodetector designed to boost the photoresponse of two-dimensional (2D) materials by utilizing up-conversion particles (UCPs) in selective infrared (IR) regions beyond the bandgap. The merit of this structure is that the incident near-infrared or short wave infrared (SWIR) light, after passing through the 2D SnSe channel layer, is converted into visible light via the up-conversion effect and then reabsorbed by SnSe. To further optimize the photoresponse improvement in the SWIR region, we fine-tuned the dopant material and its concentration for the UCPs, attaining a 3.28-fold enhancement in the up-conversion efficiency. Using these approaches, we accomplished a 9.74-fold enhancement in the selective photoresponse within the SWIR region of 2D SnSe. We extended this approach to a 2D MoS2/UCP system to demonstrate the broad applicability of a cartridge-type modular photodetector design using 2D materials and UCPs for broadband photodetection. Additionally, we demonstrated a method for reusing a cartridge-type modular photodetector by recovering the UCP and quartz framework and removing the device components for repeated use.
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- 2025
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12. Synergistic Effect of Polyglycerol and DMSO for Long-Term Cryopreservation of StichococcusSpecies
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Shin, Aram, Choi, Seong Ryeol, Yim, Jun Ho, Chung, Eu Jin, Nam, Seung Won, Burns, Brendan P., Jeon, Young Jae, and Kim, Byeong-Su
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Herein, we present a significant advancement in long-term cryopreservation techniques for microalgae Stichococcusspecies using a combination of linear polyglycerol (linPG) and dimethyl sulfoxide (DMSO). The technique was tested on three Stichococcusspecies: Stichococcus bacillaris, Stichococcus deasonii, and Stichococcus minor, which showed long-term viability and recovery rates superior to those when treated with a traditional cryoprotectant only. While DMSO alone enabled high cell recovery rates for all species after 1 week of cryopreservation, the rates for some of them dropped below 50% after 26 weeks of cryopreservation. Treating the cells with a combination of linPG and DMSO raised the recovery rates for all three Stichococcusspecies to above 92% after long-term cryopreservation. Our findings indicate that linPG in combination with DMSO offers a synergistic and effective solution for maintaining cell integrity and functionality during long-term cryopreservation of microalgae.
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- 2025
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13. Early peak of tannin content and gene expression related to tannin biosynthesis in table grape skin during berry development
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Kang, Yurim, Huh, Sun Mi, Mun, Jeong-Hwan, Kwon, Ye-Eun, Im, Dongjun, Kim, Jiin, Choi, Byung-Jae, Yim, Bomi, Hur, Youn Young, and Yu, Hee-Ju
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Low astringency in table grapes, a trait favored by consumers, is influenced by condensed tannins in the skins and seeds, regulated by complex enzymatic activities and gene expression during berry development. To facilitate the selection of less astringent table grape genotypes, this study investigated total polymeric tannin content (PTC) and transcriptomic changes in the berry skins of two cultivars, ‘Tano Red’ (non-astringent) and ‘Ruby Seedless’ (astringent), across four developmental stages. The methylcellulose precipitation assay showed consistently higher total PTC in ‘Ruby Seedless’, peaking at two weeks after full bloom (2 WAFB) and declining thereafter, a trend replicated in hybrid progeny and other cultivars. Transcriptome analysis revealed that tannin biosynthesis-related genes were most highly expressed at 2 WAFB in ‘Ruby Seedless’ compared to ‘Tano Red’, with these genes exhibiting strong co-expression network correlations. qPCR analysis further confirmed early and elevated expression of genes involved in flavan-3-ol monomer synthesis (ANR and LAR) and its galloylation (SCPL-AT) at 2 WAFB in astringent table grape cultivars. These findings demonstrate that tannin accumulation and the expression of tannin pathway genes in the berry skin peak during the early stages of berry development in astringent table grapes. The observed correlation between total PTC and the expression levels of ANR, LAR, and SCPL-AT suggests that combining total PTC measurements with the expression levels of these marker genes in the berry skin could serve as an effective tool for breeding less astringent grape cultivars.
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- 2025
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14. Decoding Fashion Activism Through Typology
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Huh, Min and Yim, Eunhyuk
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AbstractThe term “fashion activism” is now used to describe various activist practices related to fashion, dress, or clothing-making, despite their distinct natures. Although there has been extensive discourse on fashion activism, these distinctions are largely overlooked. This terminological confusion, combined with the complex dynamics of diverse cases of fashion activism, has made the concept daunting for many fashion practitioners, both professionals and students, potentially discouraging their participation. Therefore, our goal is to gain a clearer understanding of fashion activism through a comprehensive typology. We examined a wide range of activist practices broadly labeled as fashion activism, along with the varying critiques surrounding them. From this research, we categorized these instances into four distinct types, primarily based on their motivations, objectives, and methods: “Activism Uses Dress,” “Fashion Uses Activism,” “Activism Uses Fashion,” and “Activism Against Fashion.” Ultimately, through this typology, we aim to critically analyze and articulate the distinct characteristics of these four types of fashion activism, including their interests in profit-making, the limitations of their methods, their stances on the existing fashion system, and their final objectives. Furthermore, this work emphasizes the need to acknowledge and bridge the gap between fashion activism theory and practice, particularly to foster more prolific and productive collaborations between the two fields. In this vein, we present this typology as a terminological and structural framework to make fashion activism more accessible, while also highlighting the potential of activist design projects to create counter-narratives and catalyze fundamental shifts in the status quo.
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- 2025
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15. Continuous Sculpting: Persistent Swarm Shape Formation Adaptable to Local Environmental Changes
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Curtis, Andrew G., Yim, Mark, and Rubenstein, Michael
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Despite their growing popularity, swarms of robots remain limited by the operating time of each individual. We present algorithms that allow a human to sculpt a swarm of robots into a shape that persists in space perpetually, independent of onboard energy constraints, such as batteries. Robots generate a path through a shape such that robots cycle in and out of the shape. Robots inside the shape react to human initiated changes and adapt the path through the shape accordingly. Robots outside the shape recharge and return to the shape so that the shape can persist indefinitely. The presented algorithms communicate shape changes throughout the swarm using message passing and robot motion. These algorithms enable the swarm to persist through any arbitrary changes to the shape. We describe these algorithms in detail and present their performance in simulation and on a swarm of mobile robots. The result is a swarm behavior more suitable for extended duration, dynamic shape-based tasks in applications, such as entertainment, agriculture, and emergency response.
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- 2025
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16. Recent Advances in Light Outcoupling from Quantum-Dot Light-Emitting Diodes.
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Lee, Taesoo, Kim, Minjun, Chun, Beomsoo, Park, Ganghyun, Yim, Soojeong, Yu, Sunkyu, and Kwak, Jeonghun
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- 2024
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17. In-Operando FTIR Spectroscopy Study on Rapid Polysulfide Binding via Caffeine in Lithium–Sulfur Batteries.
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Yim, Taber, Pereira, Rhyz, Nedsaengtip, Jantakan, Fafarman, Aaron T., and Kalra, Vibha
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- 2024
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18. Potential for bracket bonding errors based on tray accuracy and fit: Evaluation of 6 photopolymer resins for indirect bonding trays.
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Yim, Eugine, Liu, Jing, Choi, Sung-Hwan, Chung, Chooryung J., Lee, Kee-Joon, Lee, Sang-Bae, Kim, Ki Beom, and Cha, Jung-Yul
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We assessed the accuracy and fit of 3-dimensional (3D)-printed indirect bonding (IDB) trays fabricated using various photopolymer resin materials. A maxillary plaster model and 60 plaster replicas were created. IDB trays with arbitrary bracket configurations were 3D-printed using 3 hard resins (Amber [AB], TC85DAC [TC], Orthoflex [OF]) and 3 soft resins (IBT [IT], IDB2 [ID], and MED625FLX [MD]). A reference plaster model with a computer-aided design-designed IDB tray attached with nonfunctional, arbitrary bracket configurations on the buccal surface serving as reference points for measurement was superimposed on scanned plaster replicas holding 3D-printed trays to assess transfer accuracy and clinically acceptable error. Printing accuracy was assessed by comparing computer-aided design trays to printed trays, and tray fit was measured by the gap volume between the tray and plaster replica using a Fit-Checker (GC Corp, Tokyo, Japan). Six tray groups showed significant linear transfer errors, particularly in the vertical direction (0.15 mm [95% confidence interval {CI}, 0.10-1.15]; P = 0.004). The OF group exhibited the largest vertical error (0.27 mm [95% CI, 0.19-0.35]), whereas the ID group had the smallest (0.10 mm [95% CI, 0.06-0.14]). Angular errors did not exhibit significant differences across the groups. Linear precision error was the highest in OF, followed by ID, TC, and MD, then AB and IT (P <0.001). Of all tray groups, 90.1% and 68.8% met the clinically acceptable linear (<0.25 mm) and angular errors (1°). Linear errors, particularly vertical errors, are more material-dependent than angular errors. Gap volume alone was not a reliable predictor of IDB tray accuracy. Therefore, material-specific designs are needed to control the optimal fit and facilitate precise bracket placement. • 3D printed indirect bonding trays showed significant differences in linear errors by tray group. • Linear errors show better control than angular errors in 3D-printed indirect bonding trays. • Printing accuracy with various resins depends on tray dimension, thickness error, and gap volume. • The accuracy of 3D printed trays varied depending on the material properties by tray group. [ABSTRACT FROM AUTHOR]
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- 2024
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19. pH-Mediated Solution-Phase Proton Transfer Drives Enhanced Electrochemical Hydrogenation of Phenol in Alkaline Electrolyte.
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Markunas, Brianna, Yim, Taber, and Snyder, Joshua
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- 2024
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20. Laser-Assisted Rapid Fabrication of Cobalt Hydroxide@Carbon Fiber Composites for High-Performance, Robust Structural Supercapacitors.
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Yun, Tae Ho, Kim, Taeyong, Hwang, Yunjae, Velhal, Ninad B., Park, Hyung Wook, Yim, Changyong, and Kim, Jisoo
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- 2024
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21. Gas-Phase Photocatalytic CO2 Methanation over Ru/TiO2: Effects of Pressure, Temperature, and Illumination.
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Ortiz-Ortiz, Alondra M., Yim, Carissa S., Delgado Cornejo, Daniel O., Gayle, Andrew J., Hill, Alexander J., Vogt, Victor A., Liao, Daniel W., Coons, Thomas, Fisher, Galen B., Lenert, Andrej, Schwank, Johannes W., and Dasgupta, Neil P.
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- 2024
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22. Effects of rehabilitation exercise program types on dynamic balance in patients with stroke: a meta-analysis of randomized controlled trials.
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Han, Byumsuk, Lee, Jaewon, Yim, Sanghun, and Kim, Dongmin
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TORSO physiology ,EXERCISE physiology ,PHYSICAL therapy ,THERAPEUTICS ,RESEARCH funding ,EXERCISE therapy ,EVALUATION of human services programs ,META-analysis ,GAIT disorders ,SYSTEMATIC reviews ,MEDLINE ,VIRTUAL reality ,RESISTANCE training ,AQUATIC exercises ,STROKE patients ,QUALITY assurance ,DATA analysis software ,POSTURAL balance ,CARDIAC rehabilitation ,PHYSICAL activity - Abstract
Purpose: The purposes of meta-analysis are to evaluate evidence about the effects of Rehabilitation Exercise Program on the balance of post-stroke patients, evaluated by the Berg Balance Scale (BBS). Methods: The search was conducted 'stroke,' 'rehabilitation,' 'dynamic balance,' 'Berg Balance Scale,' 'exercise' and 'randomized controlled trial'using MEDLINE (accessed by PubMed), Web of Science (WoS), ProQuest, and Google Scholar for journal studies published from January 2018 to October 2022. Two independent reviewers performed the article selection, data extraction, and methodological quality assessment. The main outcome was dynamic balance assessed by the Berg Balance scale. Results: The review included 30 papers and a total of 540 patients. The overall effect size was 0.550, a medium effect size according to the Cohen's standard. It was observed that gender has moderate effect size in male (0.551), female (0.458) and higher in male. Exercise type results showed large effect sizes in balance training (0.966), and aquatic activities (0.830), moderate effect sizes in virtual reality (0.762), moderate effect sizes in physically active (0.581), gait training (0.541), dual-task (0.478), trunk control (0.284), and small effect sizes in resistance training (0.128). Conclusions: Exercise programs are effective in improving dynamic balance in stroke patients. Especially, the meta-analysis showed higher Effect Size for balance training and virtual reality than for other programs making this relevant interventions for future head to head superiority studies that compare different balance interventions in stroke. [ABSTRACT FROM AUTHOR]
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- 2024
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23. Lithium p-toluenesulfinate-coated poly(imide) separators for enhanced safety and electrochemical performances of lithium-ion batteries.
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Seong Heo, Ji and Yim, Taeeun
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IONIC conductivity ,ENERGY density ,SHORT circuits ,THRESHOLD energy ,LITHIUM-ion batteries ,POLYIMIDES ,POLYELECTROLYTES - Abstract
[Display omitted] • p -Toluenesulfinate (PTSL) is used as a coating material to clog the pores of PI. • PTSL-coated PI separators exhibit improved thermal and physical stabilities. • PTSL coating layer can act as an artificial CEI layer at the NCM cathodes. • PTSL-coated PI consequently affords improved cycling retention over 100 cycles. Increasing the energy density of lithium-ion batteries enhances their applicability; however, ensuring their safety remains a critical issue in the energy society. Herein, we report the development of a lithium p -toluenesulfinate (PTSL)-coated polyimide (PI) separator with improved safety and electrochemical performance during cycling. It is anticipated that integrating PTSL particles into the PI separator will mitigate the risk of internal short circuits by clogging the porous structure of the PI separator and enhance the interfacial stability of the electrode materials. The PTSL is expected to act as an effective component of protective layers, physically separating the cathode from direct contact with electrolytes. The PTSL-embedded PI separator regulated the porous structure inherent to the PI separator, thereby enhancing its physical and thermal properties, such as improved wetting characteristics (evidenced by higher ionic conductivities and lithium-ion transference numbers) and thermal behaviors (reduced shrinkage and more stable thermal decomposition behaviors). During cycling, the cells with the PTSL-coated PI separator demonstrated increased cycling retention compared to the cells with graphite/NCM811 electrodes because the additional PTSL-based protective layers mitigated the electrolyte decomposition upon cycling. [ABSTRACT FROM AUTHOR]
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- 2025
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24. Extraction of polyvinylidene fluoride binder materials for used secondary batteries using supercritical CO2 for an effective battery recycling process.
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Yim, Joon-Hyuk, Seo, Won-Wook, Sik Jeon, Jun, Sung Lim, Jong, and Lee, Jae-won
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BINDING agents ,FOURIER transform infrared spectroscopy ,CARBON dioxide ,RAW materials ,POLYVINYLIDENE fluoride ,SUPERCRITICAL fluid extraction ,SUPERCRITICAL carbon dioxide - Abstract
[Display omitted] • SC-CO 2 extraction process with various cosolvents (NMP, DMAc, DMF, DMSO). • Phase behavior data in CO 2 + PVDF+cosolvent (NMP, DMAc, DMF, DMSO) system. • The highest extraction efficiency of 98.8% achieved with DMF cosolvent. • PVDF recovered with DMSO cosolvent had comparable cell performances to raw PVDF. In this study, a polyvinylidene fluoride (PVDF) binder material for secondary batteries was removed using a supercritical CO 2 extraction process instead of conventional extraction processes such as leaching and pyrolysis. To determine the optimal process conditions, the phase behavior of the binder in CO 2 was studied by measuring the pressure and temperature before the supercritical CO 2 extraction. To design an effective extraction process, the extraction time, temperature, and pressure were studied under various experimental conditions using a supercritical extraction system. Various organic cosolvents were used in the experiment to improve the extraction efficiency. According to the experimental result, the optimal extraction conditions were determined to 353.2 K, 10 MPa, and 20 min with dimethylformamide (DMF) cosolvent. Under these process conditions, the removal rate of the binder was 98.8 %. However, there was a significant difference in cell performance such as initial discharge capacity and cycling stability depending on the extraction solvent. Specifically, cycling stability improved in the order of using DMF, NMP, DMSO, and DMAc. The extracted binder material was analyzed by differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM) to compare the raw and processed materials and evaluate the reusability of the binder material. [ABSTRACT FROM AUTHOR]
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- 2025
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25. Teachers' perceptions, attitudes, and acceptance of artificial intelligence (AI) educational learning tools: An exploratory study on AI literacy for young students
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Yim, Iris Heung Yue and Wegerif, Rupert
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Artificial intelligence (AI) literacy education for young students is gaining traction among researchers and educators. Researchers are developing courses and attempting to teach AI literacy to younger students, using age‐appropriate AI educational learning tools. Although teachers play a crucial role in AI literacy education, their perceptions and attitudes have received little attention. This study explores the perceptions of 60 teachers regarding the use of AI educational learning tools, and examines the factors influencing their attitudes in relation to implementing AI literacy education. The technological acceptance model and the technological, pedagogical, and content knowledge (CK) (TPACK) framework inform the research design, and a mixed method, combining the statistical package for Social Science and thematic analysis, is employed for data analysis. The study reveals that teachers have positive perceptions regarding the usefulness and ease of use of AI educational learning tools in their AI literacy teaching. This paper also reveals that teachers embrace an arts‐based approach to teaching AI literacy. The qualitative data reveal that teachers face challenges such as insufficient CK and experience with AI; and knowledge of TPACK. The five factors affecting their acceptance of AI educational learning tools are: (a) teachers' perceptions of their AI CK and experience in teaching AI literacy (technological content knowledge); (b) technical challenges and stakeholder acceptance; (c) the attributes of AI educational learning tools; (d) school infrastructure and budget constraints; and (e) potential for distraction and negative emotional responses. This study offers insights for policymakers regarding professional development initiatives and technical support mechanisms, thereby facilitating more effective AI literacy implementation.
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- 2024
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26. Fragment-based approaches to discover ligands for tumor-specific E3 ligases
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Yim, Junhyeong, Kim, Solbi, Lee, Hyung Ho, Chung, Jin Soo, and Park, Jongmin
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ABSTRACTIntroductionTargeted protein degradation (TPD) has emerged as an innovative therapeutic strategy through selective degradation of specific proteins by harnessing the cellular ubiquitin-proteasome system (UPS), which involves over 600 E3 ubiquitin ligases. Recent proteome profiling reported tumor-specific E3 ligases in human. Development of those tumor-specific E3 ligase ligands would provide a solution for tumor-specific TPD for effective cancer treatment.Areas coveredThis review provides a comprehensive list of E3 ligases found only in specific types of tumor from public databases and highlights examples of their ligands discovered through fragment-based approaches. It details their discovery process and potential applications for precise TPD and effective cancer treatments.Expert opinionCurrent TPD strategies using proteolysis-targeting chimeras (PROTACs) primarily utilize general E3 ligases, such as CRBN and VHL. Since these E3 ligases demonstrate effective protein degradation activity in most human cell types, CRBN and VHL-based PROTACs can exhibit undesired TPD in off-target tissues, which often leads to the side effects. Therefore, developing tumor-specific E3 ligase ligands can be crucial for effective cancer treatments. Fragment-based ligand discovery (FBLD) approaches would accelerate the identification of these tumor-specific E3 ligase ligands and associated PROTACs, thereby advancing the field of targeted cancer therapies.
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- 2024
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27. COVID-19 Disease in Children With ALL Receiving Maintenance Therapy: Do Not Discount the Risk
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Kahn, Alissa R., Davis, Elizabeth S., Dai, Chen, Caudill, Caroline V., Martinez, Isaac, Brackett, Julienne, Sharma, Archana, Schwalm, Carla, Kebede, Ann, Dickens, David S., Richman, Joshua, Colace, Susan, Araya, Brook, Bhatia, Smita, Wolfson, Julie A., Levine, Jennifer M., Johnston, Emily E., Aftandilian, Catherine, Agrawal, Anurag K., De Angulo, Guillermo, Aristizabal, Paula, Bailey, Kayleen, Bardwell, Jenna K., Becton, David L., Bemrich-Stolz, Christina J., Boal, Lauren H, Boston, Catherine W.H., Bradfield, Scott M., Caywood, Emi H., Cohn, Shannon M., Colace, Susan I., Coven, Scott L., Cramer, Stuart L., Cuglievan, Branko, Dargart, Jamie L., Daghistani, Doured, Dhir, Aditi, Dickens, David S., Dumitriu, Anca, Eslin, E., Esquilin, Jose M., Feinberg, Shari L., Ferdjallah, Asmaa, Fernandez, Karen S., Fixler, Jason, Foley, Jessica M., Gampel, Bradley H., Glasser, Chana L., Goodman, Jessica F., Gotesman, Moran, Gowans, L. Kate, Gupta, Ajay, HaDuong, Josephine H., Halpern, Steven L., Hara, Harneet K., Hartman, Lisa R., Herring, Katye L., Hesko, Caroline S., Aguayo-Hiraldo, Paibel, Hoeft, Alice K., Hu, Caroline Y., Huo, Jeffrey S., Ikeda, Alan K., Isakoff, Michael S., Jain, Akshat, Kahn, Alissa R., Kothari, Prachi D., Krajewski, Jennifer A., Kram, David E., Krystal, Julie I., Kyono, Wade T., Langevin, Mary A., Hayes-Lattin, Brandon, Law, Jason, Levine, Jennifer M, Lorenzana, Adonis Napoleon, Lotterman, Craig D., Majlessipour, Fataneh, Marri, Preethi R., Massey, Gita V., Monteleone, Philip M., Moskop, Amy M., Mowbray, Catriona, Navalkele, Pournima D., Olson, Janice F., Ostrodka, Leanne, O’suoji, Chibuzo C., Patel, Pratik A., Pawlowska, Anna, Perl, Anna Sechser, Pinchinat, Ashley E., Prasad, Pinki K., Rangaswami, Arun Atreiya, Raulji, Chittalsinh M., Rico, Juan Felipe, Saha, Aniket, Salman, Emad Kassim, SantaCruz, Nadine P., Sarangi, Susmita N., Schwalm, Carla M., Sharma, Archana, Shaw, Peter H., Simon, David C., Slayton, William B., Smith, Amy A., Smitherman, Andrew B., Sorge, Caryn E., Sun, Jessica M., Symons, Heather J., Tal, Adit, Thomas, Stefanie M., Tran, Hung C., Troutman, Jacob A., Turcotte, Lucie M., Valdez, Jessica M., Varela, Carly R., Whipple, Nicholas S., Wilkes, Jennifer J., Woods-Swafford, Wendy, Yim, Yung S., and Zhang, Yaoping
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- 2024
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28. Increased CCL2/CCR2 axis promotes tumor progression by increasing M2 macrophages in MYC/BCL2 double-expressor DLBCL
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Kim, Sehui, Jeong, Hyein, Ahn, Hyun Kyung, Han, Bogyeong, Lee, Ki-Chang, Song, Young Keun, Lim, Sojung, Yim, Jeemin, Koh, Jaemoon, and Jeon, Yoon Kyung
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•The CCL2/CCR2 axis is elevated by MYC and BCL2 via nuclear factor κB p65 in DE-DLBCL.•CCL2/CCR2 axis promotes M2 polarization of macrophage and immunosuppressive environment, being a potential therapeutic target in DE-DLBCL.
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- 2024
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29. Carboxylesterase 1 directs the metabolic profile of dendritic cells to a reduced inflammatory phenotype
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Elfiky, Ahmed M I, Canñizares, Jessica López, Li, Jiarong, Li Yim, Andrew Y F, Verhoeven, Arthur J, Ghiboub, Mohammed, and de Jonge, Wouter J
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The metabolic profile of dendritic cells (DCs) shapes their phenotype and functions. The carboxylesterase 1 (CES1) enzyme is highly expressed in mononuclear myeloid cells; however, its exact role in DCs is elusive. We used a CES1 inhibitor (WWL113) and genetic overexpression to explore the role of CES1 in DC differentiation in inflammatory models. CES1expression was analyzed during CD14+monocytes differentiation to DCs (MoDCs) using quantitative polymerase chain reaction. A CES1 inhibitor (WWL113) was applied during MoDC differentiation. Surface markers, secreted cytokines, lactic acid production, and phagocytic and T cell polarization capacity were analyzed. The transcriptomic and metabolic profiles were assessed with RNA sequencing and mass spectrometry, respectively. Cellular respiration was assessed using seahorse respirometry. Transgenic mice were used to assess the effect of CES1 overexpression in DCs in inflammatory models. CES1expression peaked early during MoDC differentiation. Pharmacological inhibition of CES1 led to higher expression of CD209, CD86 and MHCII. WWL113 treated MoDCs secreted higher quantities of interleukin (IL)-6, IL-8, tumor necrosis factor, and IL-10 and demonstrated stronger phagocytic ability and a higher capacity to polarize T helper 17 differentiation in an autologous DC-T cell coculture model. Transcriptomic profiling revealed enrichment of multiple inflammatory and metabolic pathways. Functional metabolic analysis showed impaired maximal mitochondrial respiration capacity, increased lactate production, and decreased intracellular amino acids and tricarboxylic acid cycle intermediates. Transgenic human CES1overexpression in murine DCs generated a less inflammatory phenotype and increased resistance to T cell–mediated colitis. In conclusion, CES1 inhibition directs DC differentiation toward a more inflammatory phenotype that shows a stronger phagocytic capacity and supports T helper 17 skewing. This is associated with a disrupted mitochondrial respiration and amino acid depletion.Blocking carboxylesterase 1 induces dendritic cells to adopt a more inflammatory phenotype, with concurrent metabolic adaptations. Conversely, carboxylesterase 1 overexpression in dendritic cells results in a less inflammatory profile both in vitro and in vivo.
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- 2024
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30. Gas-Phase Photocatalytic CO2Methanation over Ru/TiO2: Effects of Pressure, Temperature, and Illumination
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Ortiz-Ortiz, Alondra M., Yim, Carissa S., Delgado Cornejo, Daniel O., Gayle, Andrew J., Hill, Alexander J., Vogt, Victor A., Liao, Daniel W., Coons, Thomas, Fisher, Galen B., Lenert, Andrej, Schwank, Johannes W., and Dasgupta, Neil P.
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This work examines the effects of temperature (100–150 °C), pressure (1–25 bar), and UV illumination on gas-phase photocatalytic CO2methanation over Ru/TiO2. Irradiating the catalyst enables an ∼20% decrease in operating pressure to maintain the same production rate. Furthermore, the relative light enhancement is greater at 100 °C than 150 °C─a phenomenon attributed to increased carrier recombination rates at higher temperatures. Arrhenius experiments indicate that the global activation energy (Ea) of the reaction is similar in the dark and light, suggesting that rate enhancements are determined by changes in surface coverage. To test this hypothesis, the CO2reduction mechanism is probed using in situdiffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The spectra show an increase in the relative surface coverage of the intermediate formyl group under irradiation. These findings illustrate that, within the experimental conditions explored in this study, the photoexcitation of charge carriers in the semiconductor primarily influences the surface coverage of intermediates to drive enhanced methane formation at low temperatures.
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- 2024
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31. Very-Large-Scale GPU-Accelerated Nuclear Gradient of Time-Dependent Density Functional Theory with Tamm–Dancoff Approximation and Range-Separated Hybrid Functionals
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Kim, Inkoo, Jeong, Daun, Weisburn, Leah P., Alexiu, Alexandra, Van Voorhis, Troy, Rhee, Young Min, Son, Won-Joon, Kim, Hyung-Jin, Yim, Jinkyu, Kim, Sungmin, Cho, Yeonchoo, Jang, Inkook, Lee, Seungmin, and Kim, Dae Sin
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Modern graphics processing units (GPUs) provide an unprecedented level of computing power. In this study, we present a high-performance, multi-GPU implementation of the analytical nuclear gradient for Kohn–Sham time-dependent density functional theory (TDDFT), employing the Tamm–Dancoff approximation (TDA) and Gaussian-type atomic orbitals as basis functions. We discuss GPU-efficient algorithms for the derivatives of electron repulsion integrals and exchange–correlation functionals within the range-separated scheme. As an illustrative example, we calculate the TDA-TDDFT gradient of the S1state of a full-scale green fluorescent protein with explicit water solvent molecules, totaling 4353 atoms, at the ωB97X/def2-SVP level of theory. Our algorithm demonstrates favorable parallel efficiencies on a high-speed distributed system equipped with 256 Nvidia A100 GPUs, achieving >70% with up to 64 GPUs and 31% with 256 GPUs, effectively leveraging the capabilities of modern high-performance computing systems.
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- 2024
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32. Deep Learning-Enhanced Paper-Based Vertical Flow Assay for High-Sensitivity Troponin Detection Using Nanoparticle Amplification
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Han, Gyeo-Re, Goncharov, Artem, Eryilmaz, Merve, Joung, Hyou-Arm, Ghosh, Rajesh, Yim, Geon, Chang, Nicole, Kim, Minsoo, Ngo, Kevin, Veszpremi, Marcell, Liao, Kun, Garner, Omai B., Di Carlo, Dino, and Ozcan, Aydogan
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Successful integration of point-of-care testing (POCT) into clinical settings requires improved assay sensitivity and precision to match laboratory standards. Here, we show how innovations in amplified biosensing, imaging, and data processing, coupled with deep learning, can help improve POCT. To demonstrate the performance of our approach, we present a rapid and cost-effective paper-based high-sensitivity vertical flow assay (hs-VFA) for quantitative measurement of cardiac troponin I (cTnI), a biomarker widely used for measuring acute cardiac damage and assessing cardiovascular risk. The hs-VFA includes a colorimetric paper-based sensor, a portable reader with time-lapse imaging, and computational algorithms for digital assay validation and outlier detection. Operating at the level of a rapid at-home test, the hs-VFA enabled the accurate quantification of cTnI using 50 μL of serum within 15 min per test and achieved a detection limit of 0.2 pg/mL, enabled by gold ion amplification chemistry and time-lapse imaging. It also achieved high precision with a coefficient of variation of <7% and a very large dynamic range, covering cTnI concentrations over 6 orders of magnitude, up to 100 ng/mL, satisfying clinical requirements. In blinded testing, this computational hs-VFA platform accurately quantified cTnI levels in patient samples and showed a strong correlation with the ground truth values obtained by a benchtop clinical analyzer. This nanoparticle amplification-based computational hs-VFA platform can democratize access to high-sensitivity point-of-care diagnostics and provide a cost-effective alternative to laboratory-based biomarker testing.
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- 2024
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33. Understanding mobile payment through the lens of continuity theory
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Chan, Sow Hup Joanne, Wan, Yim King Penny, Lee, Chang Boon Patrick, and Zhang, Qin Yi Carrie
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ABSTRACTThis study investigated whether mobile payment (MP) adopters in China extend their MP usage during their travel abroad, through the lens of continuity theory. The findings from in-depth interviews articulated six major concerns while using MP at home, namely perceived risks, costs, incompatibility, complexity, customer support, and social influence. Three major concerns for not using MP when travelling abroad include perceived security risk, costs, and incompatibility. Discontinuity of usage include past experiences and concerns about using MP in the home country, together with their negative evaluation of the MP service environment of the travel destinations. This study answers why some Chinese tourists abandon MP when they travel. Practical implications are offered to service providers to enhance users’ experiences.
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- 2024
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34. Scanning Tunneling Microscopy Visualization of Polaron Charge Trapping by Hydroxyls on TiO2(110).
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Yim, Chi-Ming, Allan, Michael, Pang, Chi Lun, and Thornton, Geoff
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- 2024
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35. Peripheral Blood DNA Methylation Signatures and Response to Tofacitinib in Moderate-to-severe Ulcerative Colitis.
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Joustra, Vincent, Yim, Andrew Y F Li, Gennep, Sara van, Hageman, Ishtu, Waard, Tristan de, Levin, Evgeni, Lauffer, Peter, Jonge, Wouter de, Henneman, Peter, Löwenberg, Mark, and D'Haens, Geert
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Introduction Predictive biomarkers for treatment efficacy of ulcerative colitis [UC] treatments are lacking. Here, we performed a longitudinal study investigating the association and potential predictive power of genome-wide peripheral blood [PB] DNA methylation signatures and response to tofacitinib treatment in UC. Methods We recruited moderate-to-severe UC patients starting tofacitinib treatment, and measured PB DNA methylation profiles at baseline [T1], after 8 weeks [T2], and in a subset [ n = 8] after a median of 20 weeks [T3] using the Illumina Infinium HumanMethylation EPIC BeadChip. After 8 weeks, we distinguished responders [R] from non-responders [NR] based on a centrally read endoscopic response [decrease in endoscopic Mayo score ≥1 or Ulcerative Colitis Endoscopic Index of Severity ≥2] combined with corticosteroid-free clinical and/or biochemical response. T1 PB samples were used for biomarker identification, and T2 and publicly available intraclass correlation [ICC] data were used for stability analyses. RNA-sequencing was performed to understand the downstream effects of the predictor CpG loci. Results In total, 16 R and 15 NR patients, with a median disease duration of 7 [4–12] years and overall comparable patient characteristics at baseline, were analysed. We identified a panel of 53 differentially methylated positions [DMPs] associated with response to tofacitinib [AUROC 0.74]. Most DMPs [77%] demonstrated both short- and long-term hyperstability [ICC ≥0.90], irrespective of inflammatory status. Gene expression analysis showed lower FGFR2 [ p
BH = 0.011] and LRPAP1 [ pBH = 0.020], and higher OR2L13 [pBH = 0.016] expression at T1 in R compared with NR. Conclusion Our observations demonstrate the utility of genome-wide PB DNA methylation signatures to predict response to tofacitinib. [ABSTRACT FROM AUTHOR]- Published
- 2024
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36. Accessibility of tourist signage at heritage sites: an application of the universal design principles.
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Wan, Yim King Penny
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UNIVERSAL design ,HISTORIC sites ,INDIVIDUAL differences ,PEOPLE with disabilities ,SIGNAGE ,TOURIST attitudes ,TOURISTS - Abstract
The accessibility of tourist signage was investigated in this study by utilising the stakeholder theory, concepts of tourist signage, and universal design (UD). Twenty-eight tourists who had visited Macao's heritage sites were interviewed. Results showed that regardless of individual differences in physical abilities and characteristics, tourist signage was considered important to the interviewees to know the direction to attractions and service facilities. Signage was particularly important for visiting Macao's heritage sites, which required tourists to stroll through several alleys and make many turns – including those who had weaker physical abilities such as people with disabilities and elders, as well as mothers with children. Through the interviews, the strengths and weaknesses of the tourist signage was identified, and accessibility for tourists was evaluated based on the UD principles. Results revealed that these strengths and weaknesses were compliant or noncompliant with certain UD principles in different ways and led to several tourism experiences, attitudes, and behavioural outcomes. Practical suggestions were offered. [ABSTRACT FROM AUTHOR]
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- 2024
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37. Polymer-Tethered Quenched Fluorescent Probes for Enhanced Imaging of Tumor-Associated Proteases.
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Hadzima, Martin, Faucher, Franco F., Blažková, Kristýna, Yim, Joshua J., Guerra, Matteo, Shiyu Chen, Woods, Emily C., Ki Wan Park, Šácha, Pavel, Šubr, Vladimír, Kostka, Libor, Etrych, Tomáš, Majer, Pavel, Konvalinka, Jan, and Bogyo, Matthew
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- 2024
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38. Hot Electrons in a Steady State: Interband vs Intraband Excitation of Plasmonic Gold.
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Lee, Annika, Wu, Shengxiang, Yim, Ju Eun, Zhao, Boqin, and Sheldon, Matthew T.
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- 2024
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39. Oxide-Based Nanoporous Interlayer for Durable Anodic Interface in All-Solid-State Lithium Metal Batteries.
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Jun, Dayoung, Lee, Seong Gyu, Jung, Ji Eun, Kim, Kyu Seok, Yim, Haena, Shin, Hyuksoo, Lee, Jungho, and Lee, Yun Jung
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- 2024
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40. Survival after thermal ablation versus wedge resection for stage I non-small cell lung cancer < 1 cm and 1 to 2 cm: evidence from the US SEER database.
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Yim, Shelly, Lin, Wei Chan, Liu, Jung Sen, and Yen, Ming Hong
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- 2024
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41. Validation of the measures for activities of daily living in older adult with cognitive disorders: the Korean version of the University of California San Diego Performance‐based Skills Assessment.
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Yim, Seon Jin, Kim, Kayoung, Joo, Chaelin, and Han, Joo Hyun
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Background: The study aimed to evaluate the validity of the Korean version of the University of California San Diego Performance‐based Skills Assessment, Validation of Intermediate Measures (K‐UPSA‐2‐VIM) in patients with dementia (D), Mild cognitive impairment (MCI), cognitive normal control group (CN), and explore the usefulness of the instrument as a measure of ADL in older adults with cognitive disorder. Method: Study participants were 25 patients with D, 43 patients with MCI, 111 controls with CN group, respectively. For cognitive assessment, Mini Mental State Examination (K‐MMSE‐2), Consortium to Establish a Registry for Alzheimer's Disease neuropsychological battery (CERAD‐K‐NP), Clinical Dementia Rating (CDR) were used. For functional assessment, Barthel‐Activities of Daily Living (B‐ADL), Instrumental Activities of Daily Living (K‐IADL), Dementia Screening questionnaire (K‐DSQ), K‐UPSA‐2‐VIM were used. Multivariate Analysis of Covariance (MANCOVA) was conducted to assess whether statistically significant differences existed in the scores of K‐UPSA‐2‐VIM and functional assessment measures among the different cognitive subgroups. Receiver Operating Characteristic (ROC) curve analyses were conducted to determine the optimal cut‐off scores for K‐UPSA‐2‐VIM that exhibit maximum sensitivity and specificity in discriminating between CN and MCI groups, MCI and D groups, in respectively. Result: Statistically significant differences were observed in all subdomains and total score of the K‐UPSA‐2‐VIM among three cognitive groups. All subdomains and the total score of K‐UPSA‐2‐VIM demonstrated a significant correlation with all subdomains of CERAD‐K‐NP. K‐UPSA‐2‐VIM demonstrated 75.7% of sensitivity and 65.1% of specificity, with an area under the curve (AUC) of 0.731 (95% CI:0.641‐0.821, p < 0.001) in discriminating between CN and MCI groups. In discriminating between MCI and D groups, 76.7% of sensitivity and 64.0% of specificity, with an AUC of 0.706 (95% CI:0.580‐0.833, p = 0.005) were demonstrated. Conclusion: Our study results suggest that the K‐UPSA‐2‐VIM has diagnostic validity in Korean patients with dementia and mild cognitive impairment. The K‐UPSA‐2‐VIM is useful for assessing patients, including elderly individuals living alone without caregivers. [ABSTRACT FROM AUTHOR]
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- 2024
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42. Pervaporation Membrane for Linear Alpha Olefin Separation Using Surface-Activated Silver Nanoparticles as Carriers for Facilitated Transport
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Seo, Yeon Woo, Lim, Suim, Park, Jin Woo, Jeon, Wonjin, Kim, Yong-Doo, Lee, Kyong-Hwan, Yim, Kanghoon, Kim, Jong Hak, and Lee, Jung Hyun
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Facilitated transport membranes provide a low-cost means of separating hydrocarbon mixtures. However, the application of such membranes is currently limited to gas-phase mixtures. In this study, a pervaporation membrane that can separate high concentrations of linear alpha olefins (e.g., 1-hexene and 1-octene) from liquid-phase hydrocarbon mixtures was developed. The pervaporation membrane was fabricated by coating a known olefin gas separation membrane material, poly(vinylpyrrolidone), onto a microporous support. Silver nanoparticles (Ag NPs) were incorporated into the polymer matrix and activated by the electron-accepting polarizer 7,7,8,8-tetracyanoquinodimethane to induce a partial positive charge on their surface. They acted as olefin carriers for facilitated transport, resulting in the extremely high pervaporative separation of a 1-hexene/n-hexane mixture over a long period. A 1-hexene concentration of more than 99% in the permeate was achieved at a feed concentration of 25%, resulting in a separation factor higher than 100 under stable operation for at least 100 h. Additionally, when the permeate pressure increased to 500 mbar, the 1-hexene flux sharply increased because of facilitated transport by the carrier action of the surface-charged Ag NPs, whereas the n-hexane flux remained nearly unchanged. These results demonstrate that facilitated transport membranes are highly effective in the pervaporative separation of liquid-phase mixtures and thus may provide a future direction for the development of high-performance membrane materials.
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- 2024
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43. Dynamic and Super-Personalized Media Ecosystem Driven by Generative AI: Unpredictable Plays Never Repeating the Same
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Ahn, Sungjun, Yim, Hyun-Jeong, Lee, Youngwan, and Park, Sung-Ik
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This paper introduces a media service model that exploits artificial intelligence (AI) video generators at the receive end. This proposal deviates from the traditional multimedia ecosystem, completely relying on in-house production, by shifting part of the content creation onto the receiver. We bring a semantic process into the framework, allowing the distribution network to provide service elements that prompt the content generator rather than distributing encoded data of fully finished programs. The service elements include fine-tailored text descriptions, lightweight image data of some objects, or application programming interfaces, comprehensively referred to as semantic sources, and the user terminal translates the received semantic data into video frames. Empowered by the random nature of generative AI, users can experience super-personalized services accordingly. The proposed idea incorporates situations in which the user receives different service providers’ element packages, either in a sequence over time or multiple packages at the same time. Given promised in-context coherence and content integrity, the combinatory dynamics will amplify the service diversity, allowing the users to always chance upon new experiences. This work particularly aims at short-form videos and advertisements, which the users would easily feel fatigued by seeing the same frame sequence every time. In those use cases, the content provider’s role will be recast as scripting semantic sources, transformed from a thorough producer. Overall, this work explores a new form of media ecosystem facilitated by receiver-embedded generative models, featuring both random content dynamics and enhanced delivery efficiency simultaneously.
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- 2024
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44. Improving Situation Awareness in Partially Automated Vehicles: The Effectiveness of Redesigned Visual Signals
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Lee, Okkeun, Currano, Rebecca, Miller, Dave, Yim, Seungbin, and Sirkin, David
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Visual signals that integrate situation awareness (SA) information can improve drivers’ performance when assuming control of a partially automated vehicle from a non-driving task. By incorporating information that follows the levels of model of SA, these signals enable drivers to more quickly attain higher levels of SA, potentially bypassing traditional sequential processing stages. We evaluated the effectiveness of such SA-enhanced signals (displayed in the instrument cluster) in a simulated driving study by measuring takeover times and collision occurrences. The results indicate that incorporating SA information about the environment significantly reduces the time needed for drivers to take control of the vehicle and results in fewer collisions. Considering these performance differences suggests insights on optimizing visual cues to quickly restore SA among drivers as they transition from non-driving activities to manual control in partially automated vehicles.
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- 2024
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45. Rates and Risk Factors of Progression in Patients With Nontuberculous Mycobacterial Pulmonary Disease
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Hyung, Kwonhyung, Kim, Sung-A, Kim, Joong-Yub, Kwak, Nakwon, and Yim, Jae-Joon
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The clinical course of nontuberculous mycobacterial pulmonary disease (NTM-PD) is varied, and a watchful waiting management strategy is appropriate for a subset of patients. Understanding disease progression and risk factors for progression is essential for deciding on an appropriate follow-up strategy.
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- 2024
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46. Discovery of Potent STT3A/B Inhibitors and Assessment of Their Multipathogen Antiviral Potential and Safety
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Pero, Joseph E., Mueller, Elizabeth A., Adams, Ashley M., Adolph, Ramona S., Bagchi, Parikshit, Balce, Dale, Bantscheff, Marcus, Barauskas, Ona, Bartha, Istvan, Bohan, Dana, Cai, Haiying, Carabajal, Esteban, Cassidy, James, Cato, Matthew, Chaudhary, Khuram W., Chen, Dingjun, Chen, Yi-Pei, Colas, Christophe, Darwech, Isra, Eberl, H. Christian, Fernandez, Beth, Gordon, Earl, Grosse, Johannes, Hansen, Justin, Hetzler, Belinda, Hwang, Seungmin, Jeyasingh, Sam, Kowalski, Beatriz, Lehmann, Stephanie, Lo, Gary, McAllaster, Michael, McHugh, Charles, Momont, Corey, Newby, Zachary, Nigro, Maria, Oladunni, Fatai, Pannirselvam, Malar, Park, Arnold, Pearson, Neil, Peat, Andrew J., Plastridge, Bob, Ranjan, Rohit, Safabakhsh, Pegah, Shapiro, Nathan D., Soriaga, Leah, Stokes, Neil, Sweeney, David, Talecki, Lindsey, Telenti, Amalio, Terrell, Ashley, Tse, Winston, Wang, Lisha, Wang, Shuya, Wedel, Laura, Werner, Thilo, Dalmas Wilk, Deidre, Yim, Samantha, and Zhou, Jiayi
- Abstract
In the aftermath of the COVID-19 pandemic, opportunities to modulate biological pathways common to the lifecycles of viruses need to be carefully considered. N-linked glycosylation in humans is mediated exclusively by the oligosaccharyltransferase complex and is frequently hijacked by viruses to facilitate infection. As such, STT3A/B, the catalytic domain of the OST complex, became an intriguing drug target with broad-spectrum antiviral potential. However, due to the critical role N-linked glycosylation plays in a number of fundamental human processes, the toxicological ramifications of STT3A/B inhibition required attention commensurate to that given to antiviral efficacy. Herein, we describe how known STT3A/B inhibitor NGI-1 inspired the discovery of superior tool compounds which were evaluated in in vitroefficacy and translational safety (e.g., CNS, cardiovascular, liver) studies. The described learnings will appeal to those interested in the therapeutic utility of modulating N-linked glycosylation as well as the broader scientific community.
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- 2024
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47. Scanning Tunneling Microscopy Visualization of Polaron Charge Trapping by Hydroxyls on TiO2(110)
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Yim, Chi-Ming, Allan, Michael, Pang, Chi Lun, and Thornton, Geoff
- Abstract
Using scanning tunneling microscopy (STM), we investigate the spatial distribution of the bridging hydroxyl (OHb) bound excess electrons on the rutile TiO2(110) surface and its temperature dependence. By performing simultaneously recorded empty and filled state imaging on single OHbs at different temperatures in STM, we determine that the spatial distribution of the OHbbound excess electrons retains a symmetric four-lobe structure around the OHbat both 78 and 7 K. This indicates that OHbs are much weaker charge traps compared to bridging O vacancies (Ob-vac). In addition, by sequentially removing the capping H of each OHbusing voltage pulses, we find that the annihilation of each OHbis accompanied by the disappearance of some lobes in the filled state STM, thus verifying the direct correlation between OHbs and their excess electrons.
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- 2024
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48. Remimazolam to prevent hemodynamic instability during catheter ablation under general anesthesia: a randomized controlled trial
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Yim, Subin, Choi, Chang Ik, Park, Insun, Koo, Bon Wook, Oh, Ah Young, and Song, In-Ae
- Abstract
Purpose: Maintaining hemodynamic stability during cardiac ablation under general anesthesia is challenging. Remimazolam, a novel ultrashort-acting benzodiazepine, is characterized by maintaining comparatively stable blood pressure and does not influence the cardiac conduction system, which renders it a reasonable choice for general anesthesia for cardiac ablation. We aimed to evaluate whether remimazolam is associated with a decreased incidence of intraoperative hypotension compared with desflurane. Methods: In this single-centre, parallel-group, prospective, single-blind, randomized clinical trial, we randomized patients (1:1) into a remimazolam group (remimazolam-based total intravenous anesthesia) or desflurane group (propofol-induced and desflurane-maintained inhalational anesthesia) during cardiac ablation procedures for arrhythmia. The primary outcome was the incidence of intraoperative hypotensive events, defined as mean arterial pressure of < 60 mm Hg at any period. Results: Overall, we enrolled 96 patients between 2 August 2022 and 19 May 2023 (47 and 49 patients in the remimazolam and desflurane groups, respectively). The remimazolam group showed a significantly lower incidence of hypotensive events (14/47, 30%) than the desflurane group (29/49, 59%; relative risk [RR], 0.5; 95% confidence interval [CI], 0.31 to 0.83; P= 0.004). Remimazolam was associated with a lower requirement for bolus or continuous vasopressor infusion than desflurane was (23/47, 49% vs43/49, 88%; RR, 0.56; 95% CI, 0.41 to 0.76; P< 0.001). No between-group differences existed in the incidence of perioperative complications such as nausea, vomiting, oxygen desaturation, delayed emergence, or pain. Conclusions: Remimazolam was a viable option for general anesthesia for cardiac ablation. Remimazolam-based total intravenous anesthesia was associated with significantly fewer hypotensive events and vasopressor requirements than desflurane-based inhalational anesthesia was, without significantly more complications. Study registration: ClinicalTrials.gov (NCT05486377); first submitted 1 August 2022.
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- 2024
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49. Hot Electrons in a Steady State: Interband vs Intraband Excitation of Plasmonic Gold
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Lee, Annika, Wu, Shengxiang, Yim, Ju Eun, Zhao, Boqin, and Sheldon, Matthew T.
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Understanding the dynamics of “hot”, highly energetic electrons resulting from nonradiative plasmon decay is crucial for optimizing applications in photocatalysis and energy conversion. This study presents an analysis of electron kinetics within plasmonic metals, focusing on the steady-state behavior during continuous-wave (CW) illumination. Using an inelastic spectroscopy technique, we quantify the temperature and lifetimes of distinct carrier populations during excitation. A significant finding is the monotonic increase in hot electron lifetime with decreases in electronic temperature. We also observe a 1.22× increase in hot electron temperature during intraband excitation compared to interband excitation and a corresponding 2.34× increase in carrier lifetime. The shorter lifetimes during interband excitation are hypothesized to result from direct recombination of nonthermal holes and hot electrons, highlighting steady-state kinetics. Our results help bridge the knowledge gap between ultrafast and steady-state spectroscopies, offering critical insights for optimizing plasmonic applications.
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- 2024
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50. Top 50 most cited articles about female sexual dysfunction: a bibliometric analysis
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Gong, Susan, Yim, Samuel, and Kabarriti, Abdo
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- 2024
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