Publications by authors named "HY Hwang"

Recently, the bilayer nickelate LaNiO has been discovered as a new superconductor with transition temperature T near 80 K under high pressure. Despite extensive theoretical and experimental work to understand the nature of its superconductivity, the requirement of extreme pressure restricts the use of many experimental probes and limits its application potential. Here, we present signatures of superconductivity in LaNiO thin films at ambient pressure, facilitated by the application of epitaxial compressive strain.

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Background: This meta-analysis was conducted to evaluate the impact of high-intensity statin treatment on new-onset postoperative atrial fibrillation (POAF) after coronary artery bypass grafting (CABG).

Methods: Four databases were searched for studies that enrolled patients who underwent CABG and investigated the impact of perioperative use of high-intensity statins on the occurrence rate of POAF. The primary outcome was the incidence of POAF.

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Article Synopsis
  • The study examined the effectiveness of expanded polytetrafluoroethylene (PTFE) grafts without rings compared to bovine pericardial conduits for reconstructing the superior vena cava in patients with various thoracic diseases.
  • Among 80 patients analyzed, PTFE grafts demonstrated a significantly lower rate of graft occlusion compared to bovine conduits, with 0% occlusion in the PTFE group versus 60.6% in the bovine group after two years.
  • Despite the higher occlusion rate in the bovine group, the need for reinterventions was similar for both groups, showing that PTFE grafts provide better mid-term patency in this type of surgery.
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Despite obvious similarities in their electronic and crystallographic structures, it remains unclear whether the interactions that shape the normal and superconducting (SC) state properties of high-T cuprates and infinite-layer nickelates (ILNs) have the same origin. This question has been brought into sharper focus with recent studies on ILNs of improved crystallinity that reveal a SC dome of comparable extent and similar transport properties above T as the hole-doped cuprates. The evolution of these properties in the magnetic-field-induced normal state, however, has yet to be determined.

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Background:  There is uncertainty regarding the impact of high-intensity statins on postoperative outcomes in patients undergoing surgical myocardial revascularization. This study was conducted to evaluate the impact of high-intensity statin treatment on the occurrence rate of new-onset postoperative atrial fibrillation (POAF) after off-pump coronary artery bypass grafting (OPCAB).

Methods:  Six hundred and thirteen patients (66.

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  • A study analyzed the benefits of performing multiple bypass grafts in patients with three-vessel disease (3VD) who underwent coronary artery bypass grafting (CABG).
  • The research included 1,008 patients who achieved complete revascularization and was focused on long-term outcomes over an average follow-up of about 86.6 months.
  • Findings indicated that patients with more than three distal grafts experienced lower rates of all-cause mortality and cardiac death compared to those with fewer grafts, suggesting potential benefits from more extensive grafting during surgery.
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Background: Cardiopulmonary bypass (CPB) can trigger a systemic inflammatory response during the perioperative period, which may lead to the consumption of the contact system and the production of neutrophil extracellular traps (NETs). This study attempted to determine whether the formation of NETs and contact activation are a vivid occurrence during CPB and whether they are related to post-operative atrial fibrillation (AF) and survival.

Methods: A prospective observational study was conducted in 97 patients who underwent aortic valve and/or aorta replacement surgery with CPB.

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We study the temperature dependent elastic properties of BaSrTiO freestanding membranes across the ferroelectric-to-paraelectric phase transition using an atomic force microscope. The bending rigidity of thin membranes can be stiffer compared to stretching due to strain gradient elasticity (SGE). We measure the Young's modulus of freestanding BaSrTiO drumheads in bending and stretching dominated deformation regimes on a variable temperature platform, finding a peak in the difference between the two Young's moduli obtained at the phase transition.

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We demonstrate the integration of a thin BaTiO (BTO) membrane with monolayer MoSe in a dual-gate device that enables in situ manipulation of the BTO ferroelectric polarization with a voltage pulse. While two-dimensional (2D) transition metal dichalcogenides (TMDs) offer remarkable adaptability, their hybrid integration with other families of functional materials beyond the realm of 2D materials has been challenging. Released functional oxide membranes offer a solution for 2D/3D integration via stacking.

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Background: We evaluated the prevalence and outcomes of competitive flow in the terminal right coronary artery (RCA) graft after coronary artery bypass grafting (CABG) with left internal thoracic artery-based Y-composite grafting at 1 year after CABG.

Methods: We enrolled 642 patients who underwent Y-composite graft-based off-pump CABG with in situ left internal thoracic artery between 2014 and 2022. All patients underwent early postoperative angiography, and 1-year postoperative angiography was performed in 81.

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Recent theoretical studies have suggested that transition metal perovskite oxide membranes can enable surface phonon polaritons in the infrared range with low loss and much stronger subwavelength confinement than bulk crystals. Such modes, however, have not been experimentally observed so far. Here, using a combination of far-field Fourier-transform infrared (FTIR) spectroscopy and near-field synchrotron infrared nanospectroscopy (SINS) imaging, we study the phonon polaritons in a 100 nm thick freestanding crystalline membrane of SrTiO transferred on metallic and dielectric substrates.

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X-linked adrenoleukodystrophy (ALD), an inherited neurometabolic disorder caused by mutations in ABCD1, which encodes the peroxisomal ABC transporter, mainly affects the brain, spinal cord, adrenal glands, and testes. In ALD patients, very-long-chain fatty acids (VLCFAs) fail to enter the peroxisome and undergo subsequent β-oxidation, resulting in their accumulation in the body. It has not been tested whether in vivo base editing or prime editing can be harnessed to ameliorate ALD.

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Pathogenic structure variations (SVs) are associated with various types of cancer and rare genetic diseases. Recent studies have used Cas9 nuclease with paired guide RNAs (gRNAs) to generate targeted chromosomal rearrangements, focusing on producing fusion proteins that cause cancer, whereas research on precision genome editing for rectifying SVs is limited. In this study, we identified a novel complex genomic rearrangement (CGR), specifically an inversion with a deletion, implicated in branchio-oto-renal/branchio-oto syndrome.

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Exploration of new dielectrics with a large capacitive coupling is an essential topic in modern electronics when conventional dielectrics suffer from the leakage issue near the breakdown limit. Here, to address this looming challenge, we demonstrate that rare-earth metal fluorides with extremely low ion migration barriers can generally exhibit an excellent capacitive coupling over 20 μF cm (with an equivalent oxide thickness of ~0.15 nm and a large effective dielectric constant near 30) and great compatibility with scalable device manufacturing processes.

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Background: The strategy of treatment for tricuspid regurgitation (TR) induced by atrial fibrillation (AF) has not been established. The aim of this study was to evaluate the outcomes of surgical treatment for TR induced by AF.

Methods: From 2000 to 2021, a total of 1,301 patients underwent tricuspid valve (TV) surgery.

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Nucleotide repeat expansion disorders, a group of genetic diseases characterized by the expansion of specific DNA sequences, pose significant challenges to treatment and therapy development. Here, we present a precise and programmable method called prime editor-mediated correction of nucleotide repeat expansion (PE-CORE) for correcting pathogenic nucleotide repeat expansion. PE-CORE leverages a prime editor and paired pegRNAs to achieve targeted correction of repeat sequences.

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Objectives: This retrospective study was conducted to evaluate the impact of saphenous vein (SV) harvesting with versus without perivascular tissue on the 5-year angiographic patency in coronary artery bypass grafting.

Methods: Among the 944 patients who received coronary artery bypass grafting between 2010 and 2015, 579 patients who received off-pump coronary artery bypass grafting using 1 SV as a Y-composite graft based on the in situ left internal thoracic artery were enrolled. SV harvesting was performed using no-touch technique without perivascular tissue (the NoPVT group) in 342 patients and with perivascular tissue (the PVT group) in 237 patients.

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Article Synopsis
  • This study aimed to assess the short- and long-term outcomes of performing surgical ablation (SA) for atrial fibrillation (AF) in patients undergoing isolated aortic valve replacement (AVR) using data from a national health database in Korea.
  • Among 23,332 patients who had AVR between 2003 and 2019, 1,741 with AF were analyzed and matched for comparison, focusing on those with and without SA.
  • The results indicated that while overall survival and early postoperative complications were similar for both groups, those who received SA had a significantly lower rate of new-onset late ischemic stroke, suggesting the need for SA in AF patients undergoing AVR to prevent strokes.
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  • Valve-in-valve transcatheter aortic valve replacement (AVR) is being considered as a safer alternative to redo surgical AVR due to its higher risks, particularly when dealing with failed prostheses.
  • A study involving 324 patients from 2010 to 2021 found an overall operative mortality rate of 4.6%, which dropped to 2.5% when excluding those with endocarditis.
  • Key risk factors for operative mortality identified were the presence of endocarditis, longer cardiopulmonary bypass time, and lower left ventricular ejection fraction (LVEF), indicating that patients without endocarditis and acceptable LVEF have good outcomes with redo AVR.
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Background: This study evaluated the difference in brain metabolite profiles between normothermia and hypothermia reaching 25°C in humans in vivo.

Methods: Thirteen patients who underwent thoracic aorta surgery under moderate hypothermia were prospectively enrolled. Plasma samples were collected simultaneously from the arteries and veins to estimate metabolite uptake or release.

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The discoveries of ferromagnetism down to the atomically thin limit in van der Waals (vdW) crystals by mechanical exfoliation have enriched the family of magnetic thin films [C. Gong et al., , 265-269 (2017) and B.

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We expand the concept of epitaxy to a regime of "twisted epitaxy" with the epilayer crystal orientation between two substrates influenced by their relative orientation. We annealed nanometer-thick gold (Au) nanoparticles between two substrates of exfoliated hexagonal molybdenum disulfide (MoS) with varying orientation of their basal planes with a mutual twist angle ranging from 0° to 60°. Transmission electron microscopy studies show that Au aligns midway between the top and bottom MoS when the twist angle of the bilayer is small (<~7°).

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