Publications by authors named "SooHyun Chang"
Crystallographic characteristics, including grain boundaries and crystallographic orientation of each grain, are crucial in defining the properties of two-dimensional materials (2DMs). To date, local microstructure analysis of 2DMs, which requires destructive and complex processes, is primarily used to identify unknown 2DM specimens, hindering the subsequent use of characterized samples. Here, a nondestructive large-area 2D crystallographic analytical method through sticky-note-like van der Waals (vdW) assembling-disassembling is presented.
View Article and Find Full Text PDFBackground: Conduction abnormality requiring the implantation of a permanent pacemaker (PPM) is a well-known and clinically important complication of transcatheter aortic valve replacement (TAVR). However, PPM implantation may result in lead-associated tricuspid valve regurgitation (TR). This study sought to determine the incidence and progression of TR following PPM implantation after TAVR.
View Article and Find Full Text PDFArticle Synopsis
- Graphdiyne (GDY) is a promising 2D material known for its excellent electronic properties, but its widespread use in flexible applications is limited by challenges in uniform, large-scale production.
- Researchers have successfully developed a method to synthesize centimeter-scale bilayer hydrogen substituted graphdiyne (Bi-HsGDY) on a germanium substrate using low-temperature chemical vapor deposition (CVD).
- The Bi-HsGDY demonstrates impressive performance in field effect transistors (FETs) and has been used to create a fast-responding strain sensor, even capable of Morse code communication, paving the way for new flexible device applications.
Purpose: There is lack of validated methods for quantifying the size of pleural effusion from standard transthoracic (TTE) windows. The purpose of this study is to determine whether pleural effusion (Peff) measured from routine two-dimensional (2D) TTE views correlate with chest radiograph (CXR).
Materials And Methods: We retrospectively identified all inpatients who underwent a TTE and CXR within 2 days in a large tertiary care center.
Background: Clinical utility of cardiac biomarker testing during pregnancy in women with preexisting cardiac disease is not well known. We studied the levels and temporal trends of NT-proBNP (N-terminal pro-B-type natriuretic peptide) and hs-cTnI (high-sensitivity cardiac troponin I) throughout pregnancy in women with preexisting cardiac disease and sought to assess the association between NT-proBNP and hs-cTnI and pregnancy outcomes.
Methods: Three hundred seven pregnant women with preexisting cardiac disease were prospectively recruited.
The diagnostic accuracy of the cardiothoracic ratio on chest X-ray to detect left ventricular (LV) enlargement has not been well defined despite its traditional association with cardiomegaly. We aimed to determine whether the cardiothoracic ratio can accurately predict LV enlargement based on indexed linear measurements of the LV on transthoracic echocardiography (TTE). We included consecutive patients who had a TTE and a posteroanterior chest X-ray performed within 90 days of each other at a tertiary care center.
View Article and Find Full Text PDFBackground: The aim of our study was to characterize echocardiographic changes during pregnancy in women with known LVOT obstruction or AS compared to the healthy pregnancy controls, and to assess the relationship with pregnancy outcomes.
Methods: We retrospectively studied 34 pregnant patients with congenital LVOT obstruction or AS with healthy age-matched pregnant controls. Patients with other significant valvular lesions, structural heart disease (LVEF < 40%), or prior valve surgery were excluded.