http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
( Sung-don Park ),( Na-young Kim ),( Jae-han Jeon ),( Jung-guk Kim ),( In-kyu Lee ),( Keun-gyu Park ),( Yeon-kyung Choi ) 대한내과학회 2021 The Korean Journal of Internal Medicine Vol.36 No.4
Background/Aims: Coronavirus disease 2019 (COVID-19) is a global pandemic that had affected more than 13,000 people in South Korea by July 2020. To prevent spread of COVID-19, tele-prescription was permitted temporarily. This study investigated the impact of tele-prescription on glycemic control in patients with type 2 diabetes. Methods: Glycated hemoglobin (HbA1c) concentrations were retrospectively analyzed in patients with type 2 diabetes who were treated with tele-prescription because of COVID-19 and those who were treated by face-to-face care (non-tele-prescription group) enrolled at the same period of time. Mean HbA1c concentrations and mean change in HbA1c concentration (ΔHbA1c) were compared in these two groups. Results: The mean HbA1c levels of patients were significantly higher after than before the tele-prescription period (7.46% ± 1.24% vs. 7.27% ± 1.13%, p < 0.05). Mean ΔHbA1c was significantly higher in the tele-prescription than in the non-tele-prescription group (0.19% ± 0.68% vs. 0.04% ± 0.95%, p < 0.05). HbA1c was significantly greater in patients taking fewer oral hypoglycemic agents, no insulin, fewer comorbidities (e.g., coronary artery disease, cerebrovascular accident, and diabetic neuropathy), and higher baseline HbA1c. Conclusions: Tele-prescription may worsen glycemic control in patients with type 2 diabetes during public health crises.
Choi, Jaewon,Myung, Yoon,Gu, Min Guk,Kim, Sung-Kon Elsevier 2019 Journal of industrial and engineering chemistry Vol.71 No.-
<P><B>Abstract</B></P> <P>In this work, we present the nanohybrid electrode (termed as p-h-SnO<SUB>2</SUB>/GA) of porous hollow SnO<SUB>2</SUB> (p-h-SnO<SUB>2</SUB>) integrated on the surface of graphene aerogel (GA) for anodes with large lithium storage capacity. Selective etching of Ni from Ni<SUB>3</SUB>Sn<SUB>2</SUB> nanoparticles produces the porous hollow nanostructure of SnO<SUB>2</SUB>, which is important for providing the structural flexibility that can accommodate the volume change of SnO<SUB>2</SUB> during the lithiation and delithiation processes. GA also serves as a buffer for the volume change of SnO<SUB>2</SUB> and induces effective charge transports through its interconnected porous network structure. These combined advantages of p-h-SnO<SUB>2</SUB> and GA enable a reversible Li storage capacity as high as 620mAhg<SUP>−1</SUP> with ∼100% Coulombic efficiency at a specific current of 50mAg<SUP>−1</SUP> over 200 charge–discharge cycles and ∼71% of rate-retention capability over the specific currents of 100mAg<SUP>−1</SUP>–1Ag<SUP>−1</SUP>. It makes this nanohybrid electrodes an attractive candidate for high-performance lithium ion battery anode.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Choi, Deok-Gyun,Hwang, Jeong-Sook,Choi, Sung-Chul,Lim, Sung-Hwan,Kim, Jong-Guk,Choo, Yeon-Sik The Ecological Society of Korea 2016 Journal of Ecology and Environment Vol.39 No.1
This study was to investigate the effect of salt stress on physiological characteristics such as plant growth, photosynthesis, solutes related to osmoregulation of Beta vulgaris. A significant increase of dry weight was observed in 50 mM and 100 mM NaCl. The contents of Chl a, b and carotenoid were lower in NaCl treatments than the control. On 14 day after NaCl treatment, photosynthetic rate (P<sub>N</sub>), the transpiration rate (E) and stomatal conductance of CO<sub>2</sub> (g<sub>s</sub>) were reduced by NaCl treatment. On 28 day after NaCl treatment, the significant reduction in g<sub>s</sub> and E was shown in NaCl 200 mM. However, P<sub>N</sub> and water use efficiency (WUE) in all NaCl treatments showed higher value than that of control. Total ion contents (TIC) and osmolality were higher than the control. On 14 day after treatment, the contents of proline (Pro) increased significantly in 200 mM and 300 mM NaCl concentration compared with control, whereas on 28 day in all treatments it was lower than that of the control. The contents of glycine betaine (GB) increased with the increase of NaCl concentration. The contents of Na<sup>+</sup>, Cl<sup>-</sup>, GB, osmolality and TIC increased with the increase of NaCl concentrations. These results suggested that under severe NaCl stress conditions, NaCl treatment did not induce photochemical inhibition on fluorescence in the leaves of B. vulgaris, but the reduction of chlorophyll contents was related in a decrease in leaf production. Furthermore, increased GB as well as Na<sup>+</sup> and Cl<sup>-</sup> contents resulted in a increase of osmolality, which can help to overcome NaCl stress.
Choi, Hee-Don,Han, Jeong-Jun,Yang, Ji-Hee,Lee, Sang-Hoon,Kim, Yun-Sook,Chung, Guk-Hoon,Hahm, Dae-Hyun The Korean Society for Applied Biological Chemistr 2013 Applied Biological Chemistry (Appl Biol Chem) Vol.56 No.2
Effect of supplementation of phosphatidylserine (PS), enzymatically synthesized from soy lecithin, on skin moisture and wrinkle in animal and human was investigated. Skin moisture content of hairless mice was significantly decreased and skin thickness and wrinkle were significantly increased by UV irradiation, whereas PS-supplemented groups showed reduced wrinkle depth and much less wrinkle area unlike UV control (UV/Con) group. The collagen content in PS-supplemented groups increased compared with that in UV/Con group. A placebo-controlled double-blind intake study of soft capsules containing PS (300 mg/day) was performed on 63 subjects who had normal healthy skin for 12 weeks. Dermatologist's visual assessment and image analysis of replicas showed that wrinkle near eye was improved by PS-supplementation. Upon measurement of moisture content in the skin, PS supplementation increased the moisture content in the skin. These findings showed that PS supplementation was effective in moisturizing and improving wrinkle of the skin in both animal and human; thus, PS could be used as an effective skin food ingredient.
Extracorporeal Shock Wave Therapy: Its Acoustical Aspects
Choi, Min-Joo,Cho, Sung-Chan,Paeng, Dong-Guk,Lee, Kang-Il The Acoustical Society of Korea 2010 韓國音響學會誌 Vol.29 No.e3
Extracorporeal shock wave therapy (ESWT) is simply evolved from extracorporeal shock wave lithotripsy known as a revolutionary non-invasive technique for treating kidney stone diseases. Since ESWT was approved for treating plantar fasciitis by FDA in 2000, it has been rapidly accepted into various clinical practices. Its indication includes chronic tendinitis and pseudoarthrosis, and has been widened to various applications other than orthopeadics. Little has been reported on their acoustic properties, yet, even if a number of clinical ESWT systems are readily available. This article reviews the acoustical aspects of ESWT and discusses critical issues towards acoustic exposure optimization and shock wave dosimetry.
Solute patterns of four halophytic plant species at Suncheon Bay in Korea
Choi, Sung-Chul,Choi, Deok-Gyun,Hwang, Jeong-Sook,Kim, Jong-Guk,Choo, Yeon-Sik The Ecological Society of Korea 2014 Journal of Ecology and Environment Vol.37 No.3
To investigate the solute pattern of salt marsh plants in Suncheon Bay in Korea, plants and soil samples were collected at three sites from July to September 2011. The soil pH around the investigated species was weakly alkaline, 6.9-8.1. The total ion and Cl- content of site 1 gradually increased, while those of site 2 and site 3 were lowest in August and highest in September. The exchangeable $Ca^{2+}$, $Mg^{2+}$ and $K^+$ in the soil were relatively constant during the study period, but the soil exchangeable $Na^+$ content was variable. Carex scabrifolia and Phragmites communis had constant leaf water content and very high concentrations of soluble carbohydrates during the study period. However, Suaeda malacosperma and S. japonica had high leaf water content and constant very low soluble carbohydrate concentrations. Carex scabrifolia accumulated similar amounts of $Na^+$ and $K^+$ ions in its leaves. Phragmites communis contained a high concentration of $K^+$ ions. Suada japonica and S. malacosperma had more $Na^+$ and $Cl^-$ ions than $K^+$ ions in their leaves. Suaeda japonica had higher levels of glycine betaine in its leaves under saline conditions than C. scabrifolia and P. communis. Consequently, the physiological characteristics of salt marsh chenopodiaceous plants (S. japonica and S. malacosperma) were the high storage capacity for inorganic ions (especially alkali cations and chloride) and accumulation of glycine betaine, but monocotyledonous plant species (C. scabrifolia and P. communis) showed high $K^+$concentrations, efficient regulation of ionic uptake, and accumulation of soluble carbohydrates. These characteristics might enable salt marsh plants to grow in saline habitats.
Unit Commitment by Separable Augmented Lagrangian Relaxation
Guk-Hyun Moon,Sung-Kwan Joo,Kisung Lee,Jae-Seok Choi 대한전기학회 2008 Journal of Electrical Engineering & Technology Vol.3 No.4
The non-separable quadratic penalty terms create an inherent difficulty when applying the standard augmented Lagrangian relaxation (ALR) method for decomposing the unit commitment problem into independent subproblems. This paper presents a separable augmented Lagrangian relaxation method for solving the unit commitment problem. The proposed method is designed to have a separable structure by introducing the quadratic terms with additional auxiliary terms in the augmented Lagrangian function. Numerical results are presented to validate the effectiveness of the proposed method.