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The Up-to-date Informations of Progesterone Supplementation for Prevention of Preterm Birth
Hyunjin Cho 고신대학교(의대) 고신대학교 의과대학 학술지 2013 고신대학교 의과대학 학술지 Vol.28 No.1
Preterm birth (PTB) remains a major cause of neonatal mortality and morbidity, despite improvements in tocolytic treatment and neonatal care. Progesterone (17a-hydroxyprogesterone) produced naturally or synthetically can prevent PTB when applied vaginally and orally. Progesterone use may be a safe and cost-effective option in cases of singleton pregnancy with prior PTB, asymptomatically short cervix and arrested preterm labor.
Quality evaluation of pregnancy-related mobile applications in South Korea: a descriptive study
Hyunjin Cho,Feiyan Yi,안숙희 한국여성건강간호학회 2023 여성건강간호학회지 Vol.29 No.3
Purpose: This study aimed to describe the characteristics of mobile applications (apps) related to pregnancy in South Korea and evaluate their quality.Methods: We conducted a systematic search for pregnancy-related apps available in Korea in two app stores as of April 29, 2022. The quality of apps was assessed using the Korean translation of the Mobile Application Rating Scale for objective quality with four subdomains (engagement, function, aesthetics, and information) and four items for subjective quality. Results: In total, 163 apps were selected and reviewed. Both the objective and subjective quality of the apps were found to be desirable, with scores exceeding 3 out of 5 (range, 34–82). All subdomain scores in the objective quality assessment were also desirable. Among the four objective quality subdomains, aesthetics received the highest scores, followed by information, function, and engagement. In terms of subjective quality, the scores for a comprehensive overall evaluation, continuous use, and recommendation exceeded 3 out of 5, with the exception of payment. Only a small number of apps (n=4, 2.9%) were backed by a reliable authority, such as an expert review. Significant differences were observed in the objective quality of apps across different content categories (F=3.86, p=.003).Conclusion: Most pregnancy-related apps had desirable levels of objective and subjective quality. However, app content experts seldom provide reviews. It is crucial for nurses to recommend apps to expectant mothers that offer dependable content, regularly updated with the latest information.
Cho, Hyunjin,Seo, Young-Kwon,Yoon, Hee-Hoon,Kim, Soo-Chan,Kim, Sung-Min,Song, Kye-Yong,Park, Jung-Keug American Institute of Chemical Engineers ; America 2012 Biotechnology progress Vol.28 No.5
<P>Adult stem cells are considered multipotent. Especially, human bone marrow-derived mesenchymal stem cells (hBM-MSCs) have the potential to differentiate into nerve type cells. Electromagnetic fields (EMFs) are widely distributed in the environment, and recently there have been many reports on the biological effects of EMFs. hBM-MSCs are weak and sensitive pluripotent stem cells, therefore extremely low frequency-electromagnetic fields (ELF-EMFs) could be affect the changes of biological functions within the cells. In our experiments, ELF-EMFs inhibited the growth of hBM-MSCs in 12 days exposure. Their gene level was changed and expression of the neural stem cell marker like nestin was decreased but the neural cell markers like MAP2, NEUROD1, NF-L, and Tau were induced. In immunofluorescence study, we confirmed the expression of each protein of neural cells. And also both oligodendrocyte and astrocyte related proteins like O4 and GFAP were expressed by ELF-EMFs. We suggest that EMFs can induce neural differentiation in BM-MSCs without any chemicals or differentiation factors.</P>
Parametric Study of Methanol Chemical Vapor Deposition Growth for Graphene
Hyunjin Cho,Changhyup Lee,In Seoup Oh,Sungchan Park,Hwan Chul Kim,Myung Jong Kim 한국탄소학회 2012 Carbon Letters Vol.13 No.4
Methanol as a carbon source in chemical vapor deposition (CVD) graphene has an advantage over methane and hydrogen in that we can avoid optimizing an etching reagent condition. Since methanol itself can easily decompose into hydrocarbon and water (an etching reagent) at high temperatures [1], the pressure and the temperature of methanol are the only parameters we have to handle. In this study, synthetic conditions for highly crystalline and large area graphene have been optimized by adjusting pressure and temperature; the effect of each parameter was analyzed systematically by Raman, scanning electron microscope, transmission electron microscope, atomic force microscope, four-point-probe measurement, and UV-Vis. Defect density of graphene, represented by D/G ratio in Raman, decreased with increasing temperature and decreasing pressure; it negatively affected electrical conductivity. From our process and various analyses, methanol CVD growth for graphene has been found to be a safe, cheap, easy, and simple method to produce high quality, large area, and continuous graphene films.
Graphene–Carbon–Metal Composite Film for a Flexible Heat Sink
Cho, Hyunjin,Rho, Hokyun,Kim, Jun Hee,Chae, Su-Hyeong,Pham, Thang Viet,Seo, Tae Hoon,Kim, Hak Yong,Ha, Jun-Seok,Kim, Hwan Chul,Lee, Sang Hyun,Kim, Myung Jong American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.46
<P>The heat generated from electronic devices such as light emitting diodes (LEDs), batteries, and highly integrated transistors is one of the major causes obstructing the improvement of their performance and reliability. Herein, we report a comprehensive method to dissipate the generated heat to a vast area by using the new type of graphene carbon metal composite film as a heat sink. The unique porous graphene-carbon-metal composite film that consists of an electrospun carbon nanofiber with arc-graphene (Arc-G) fillers and an electrochemically deposited copper (Cu) layer showed not only high electrical and thermal conductivity but also high mechanical stability. Accordingly, superior thermal management of LED devices to that of conventional Cu plates and excellent resistance stability during the repeated 10 000 bending cycles has been achieved. The heat dissipation of LEDs has been enhanced by the high heat conduction in the composite film, heat convection in the air flow, and thermal radiation at low temperature in the porous carbon structure. This result reveals that the graphene carbon metal composite film is one of the most promising materials for modern electronics.</P>
Motor Function in School-Aged Children with Attention-Deficit/Hyperactivity Disorder in Korea
Hyunjin Cho,Seokyeon Ji,Sungho Chung,Meesun Kim,YooSook Joung 대한신경정신의학회 2014 PSYCHIATRY INVESTIGATION Vol.11 No.3
Objective-Motor function critically influences daily activities and academic performance. We compared motor function in schoolaged children with Attention-Deficit/ Hyperactivity Disorder (ADHD) to that of normal children. Methods-Participants were 58 children with ADHD [51 males, 7 females; mean age 9 years 6 months±2 years 0 months (SD)] and 70 normal controls [56 males, 14 females; mean age 9 years 2 months±1 years 7 months (SD)]. We assessed motor function with the Bruininks- Oseretsky Test of Motor Proficiency, Second Edition. Results-The ADHD group had a significantly lower total motor composite score (t=-9.32, p<0.001) than that of the control group. Standard scores of four motor-area composites such as fine manual control (t=-3.76, p<0.001), manual coordination (t=-6.87, p<0.001), body coordination (t=-7.14, p<0.001), and strength and agility (t=-8.54, p<0.1) were significantly lower in the ADHD group than those in the control group. Among the subtests, scores on fine motor precision, fine motor integration, manual dexterity, bilateral coordination, balance, running speed and agility, and strength were significantly lower in the ADHD group than those in the controls, whereas upper-limb coordination was not significantly different between the groups. Conclusion-School-aged children with ADHD in Korea had significantly lower motor function compared to that of controls. Thus, it is suggested that appropriate target intervention for motor function is important in children with motor impairment in addition to pharmacotherapy or psychosocial therapy for improving the core symptoms.
Cho, Hyunjin,Kim, Whi Dong,Lee, Kangha,Lee, Seokwon,Kang, Gil-Seong,Joh, Han-Ik,Lee, Doh C. Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.429 No.-
<P><B>Abstract</B></P> <P>We investigate the product selectivity of CO<SUB>2</SUB> reduction using NiO photocathodes decorated with CdSe quantum dots (QDs) of varying size in a photoelectrochemical (PEC) cell. Size-tunable and quantized energy states of conduction band in CdSe QDs enable systematic control of electron transfer kinetics from CdSe QDs to NiO. It turns out that different size of CdSe QDs results in variation in product selectivity for CO<SUB>2</SUB> reduction. The energy gap between conduction band edge and redox potential of each reduction product (<I>e.g.</I>, CO and CH<SUB>4</SUB>) correlates with their production rate. The size dependence of the electron transfer rate estimated from the energy gap is in agreement with the selectivity of CO<SUB>2</SUB> reduction products for all reduction products but CO. The deviation in the case of CO is attributed to sequential conversion of CO into CH<SUB>4</SUB> with CO adsorbed on electrode surface. Based on a premise that the CdSe QDs would exhibit similar surface configuration regardless of QD size, it is concluded that the electron transfer kinetics proves to alter the selectivity of CO<SUB>2</SUB> reduction.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Size-tunable energy states of conduction band in CdSe quantum dots enable systematic control of product selectivity for CO<SUB>2</SUB> reduction. </LI> <LI> The energy gap between conduction band edge and redox potential of each reduction product correlates with their production rate. </LI> <LI> The electron transfer kinetics proves to alter the selectivity of CO<SUB>2</SUB> reduction. </LI> </UL> </P>