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( Yeonhee Lee ),( Kyung Don Yoo ),( Seon Ha Baek ),( Yang Gyun Kim ),( Hyo Jin Kim ),( Ji Young Ryu ),( Jin Hyuk Paek ),( Sang Heon Suh ),( Se Won Oh ),( Jeonghwan Lee ),( Jong Hyun Jhee ),( Jin-soon 대한전해질학회 2022 Electrolytes & Blood Pressure Vol.20 No.1
The Korean Society for Electrolyte and Blood Pressure Research, in collaboration with the Korean Society of Nephrology, has published a clinical practice guideline (CPG) document for hyponatremia treatment. The document is based on an extensive evidence-based review of the diagnosis, evaluation, and treatment of hyponatremia with the multidisciplinary participation of representative experts in hyponatremia with methodologist support for guideline development. This CPG consists of 12 recommendations (two for diagnosis, eight for treatment, and two for special situations) based on eight detailed topics and nine key questions. Each recommendation begins with statements graded by the strength of the recommendations and the quality of the evidence. Each statement is followed by rationale supporting the recommendations. The committee issued conditional recommendations in favor of rapid intermittent bolus administration of hypertonic saline in severe hyponatremia, the use of vasopressin receptor antagonists in heart failure with hypervolemic hyponatremia, and syndrome of inappropriate antidiuresis with moderate to severe hyponatremia, the individualization of desmopressin use, and strong recommendation on the administration of isotonic fluids as maintenance fluid therapy in hospitalized pediatric patients. We hope that this CPG will provide useful recommendations in practice, with the aim of providing clinical support for shared decision-making to improve patient outcomes.
Kim, Minjung,Lee, Jihye,Kim, Haidong,Lee, Kang-Bong,Lee, Yeonhee American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.10
<P>Chalcopyrite Cu(In,Ga)Se-2 (CIGS) semiconductor films are important as next generation solar cell materials and have great potential for use in device applications, especially for fabricating high-efficiency solar cells with practically no degradation of the absorber layer. In order to understand the physical properties of the CIGS films, the CIGS absorber layers have been characterized by many research groups so that the solar cell efficiencies could be further improved and theoretical efficiencies could be approached as far as practicable. To improve the efficiency of CIGS solar cells, a quantitative and depth-resolved elemental analysis of photovoltaic thin films is strongly required. In this work, using a three-stage evaporation process, different CIGS thin films were prepared on molybdenum back contacts deposited on soda-lime glass substrates. Surface analyses via XPS and SIMS were performed to characterize the CIGS thin films and compare their compositional distribution according to the depth. The average concentrations of the matrix elements, Cu, In, Ga, and Se were compared with the quantitative results of ICP-AES and EPMA. To identify the impurities in the CIGS layer, distributions of trace elements were also observed, according to the depth, by SIMS. Using SEM and TEM, we carried out detailed microstructural studies in cross-sections of CIGS thin film solar cells that had different cell efficiencies. The elemental composition, impurity distribution, and microstructure of the CIGS thin film solar cells were investigated to understand their effects on the solar cell conversion efficiency.</P>
Production of 3-Hydroxypropionic acid from Acetate by Metabolically Engineered Escherichia coli
( Yeonhee Kim ),( Sivachandiran S ),( Sunghoon Park ) 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Acetate, a major unwanted byproduct of industrial biological production and of lignocellulosic biomass hydrolysate, could have a great potential to be very cost-effective and alternative carbon source in the production of platform chemicals. Here we engineered Escherichia coli strain for 3-hydroxypropionic acid (3-HP) production from acetate. Several strategies of metabolic engineering including the disruption Acetyl-CoA competing pathways, blockage of glyoxylate shunt, improvement of cofactor (i.e., NADPH) supply, and redirection of the gluconeogenesis pathway were employed. Resting cell was adopted in acetate for the conversion of acetate to 3-HP, and the highest yield 0.16 mol/mol, about 32% of maximum theoretical yield was observed with the engineered producing strain.
( Yeonhee Kim ),( Eui Jin Cho ),( Hee Joung Lee ),( In Yang Park ),( Gyul Jung ) 대한산부인과학회 2022 대한산부인과학회 학술대회 Vol.108 No.-
Objective: To evaluate the efficacy of local continuous subperitoneal infusion of bupivacaine (On-Q pump) in postoperative pain relief and the requirement of opioids and other analgesics in women with cesarean section. Methods: Women with cesarean section were randomly allocated to two groups (35 for the study group: bupivacaine and 35 for the control group: normal saline). They received a continuous preperitoneal infusion of either 0.25% bupivacaine or 0.9% normal saline for 48 h, based on their group allocation, through a multi-holed catheter. All patients also received intravenous fentanyl through an IV-PCA pump. They were followed up for accessing the pain scores (visual analog scale, VAS), consumption of IV-PCA, and other analgesics requirements 3 times; less than 8hour, day 1(POD1), and day2 (POD2). The blood sample was obtained at POD1 and measured fentanyl concentration from maternal serum using liquid chromatography-Tandem mass spectrometry. An Independent T-test was used to compare the means of continuous variables, and the Mann-Whitney test was used for nominal variables. Results: In total 69 patients (35 of the study and 34 of the control group) were analyzed, and the mean VAS scores of the study group were lower at less than 8h and POD1, and significantly lower at POD2 than the control group (2.7± .0.9 Vs. 3.4 ± 1.32, P = 0.01). The IV-PCA consumption was significantly lower 3 times than the control group (less than 8h, POD1, and POD2, p=0.04, <0.001, and <0.001 respectively). Total administration of additional analgesics was significantly higher in the control group. The 62 serum samples that were able to be measured for fentanyl concentration (30 of the study group and 32 of the control group) showed no difference between the 2 groups, and the 7 samples were below the measurable limit. Conclusion: This study revealed that continuous preperitoneal bupivacaine infusion is effective for pain relief and reducing IV PCA and other analgesics requirements.
Yeonhee Kim,Moses Kang,Muljadi, Eduard,Jung-Wook Park,Yong Cheol Kang IEEE 2017 IEEE transactions on sustainable energy Vol.8 No.3
<P>This paper proposes a power-smoothing scheme for a variable-speed wind turbine generator (WTG) that can smooth out the WTG's fluctuating power caused by varying wind speeds, and thereby keep the system frequency within a narrow range. The proposed scheme employs an additional loop based on the system frequency deviation that operates in conjunction with the maximum power point tracking (MPPT) control loop. Unlike the conventional, fixed-gain scheme, its control gain is modified with the rotor speed. In the proposed scheme, the control gain is determined by considering the ratio of the output of the additional loop to that of the MPPT loop. To improve the contribution of the scheme toward maintaining the frequency while ensuring the stable operation of WTGs, in the low rotor speed region, the ratio is set to be proportional to the rotor speed; in the high rotor speed region, the ratio remains constant. The performance of the proposed scheme is investigated under varying wind conditions for the IEEE 14-bus system. The simulation results demonstrate that the scheme successfully operates regardless of the output power fluctuation of a WTG by adjusting the gain with the rotor speed, and thereby improves the frequency-regulating capability of a WTG.</P>