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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>
( 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.
( 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.
Characterizing Organelles in Live Stem Cells Using Label-Free Optical Diffraction Tomography
Kim, Youngkyu,Kim, Tae-Keun,Shin, Yeonhee,Tak, Eunyoung,Song, Gi-Won,Oh, Yeon-Mok,Kim, Jun Ki,Pack, Chan-Gi Korean Society for Molecular and Cellular Biology 2021 Molecules and cells Vol.44 No.11
Label-free optical diffraction tomography (ODT), an imaging technology that does not require fluorescent labeling or other pre-processing, can overcome the limitations of conventional cell imaging technologies, such as fluorescence and electron microscopy. In this study, we used ODT to characterize the cellular organelles of three different stem cells-namely, human liver derived stem cell, human umbilical cord matrix derived mesenchymal stem cell, and human induced pluripotent stem cell-based on their refractive index and volume of organelles. The physical property of each stem cell was compared with that of fibroblast. Based on our findings, the characteristic physical properties of specific stem cells can be quantitatively distinguished based on their refractive index and volume of cellular organelles. Altogether, the method employed herein could aid in the distinction of living stem cells from normal cells without the use of fluorescence or specific biomarkers.
Beyond 70 Years of Armed Peace - Korea Peace Now!
Yeonhee Sophie Kim 통일연구원 2020 International journal of korean unification studie Vol.29 No.1
Korea Peace Now! Women Mobilizing to End the Korean War is a transnational campaign led by four women’s peace organizations calling for the formal end to the Korean War with a peace agreement. These four organizations – Women Cross DMZ, Nobel Women’s Initiative, Women’s International League for Peace and Freedom (WILPF) and Korean Women’s Movement for Peace – are focused on changing policy in the United States, at the United Nations, and key countries, including Canada and South Korea. Women Cross DMZ is leading efforts in the United States and the key organization leading the U.S.-based Korea Peace Now Grassroots Network (KPNGN). As a regional coordinator for one of the eleven regional chapters of the KPNGN, I will examine the way the campaign actualizes, in theory and in practice, a feminist approach to its peace work in the United States. This paper seeks to present the KPNGN as a critical part of the growing peace agenda mobilizing to shape U.S. foreign policy towards North Korea. The paper will identify the practices and tactics of Korea Peace Now! which, I argue, places the movement in the tradition of feminist peace movements. My analysis draws on the intellectual framework developed in Feminist Security Studies (FSS) and Feminist Transitional Justice (FTJ). I argue that feminist peacebuilding is meaningful and important in the context of imagining a recuperative future on the Korean Peninsula.