ZnO-Embedded N-Doped Porous Carbon Nanocomposite as a Superior Anode Material for Lithium-Ion Batteries

Kim, Taegyeong,Kim, Hanah,Han, Jung-Min,Kim, Jongsik Pergamon Press 2017 Electrochimica Acta Vol. No.

<P><B>Abstract</B></P> <P>A nano-sized ZnO-loaded/N-doped carbon composite (ZnO/N-CF) was prepared by anchoring the zeolitic imidazolate framework, ZIF-8, onto a porous carbon foam (CF) with water vapor-assisted method, followed by the controlled two-step heat treatments. Utilization of ZIF-8 as a Zn source facilitated the impregnation of Zn species into the mesopores of the CF matrix, establishing the beneficial conductive networks between ZnO particles and preventing the growth and aggregation of ZnO particles during the prolonged cycles. The ZnO/N-CF sample exhibited stable discharge capacities of more than 1177mA h g<SUP>−1</SUP> after 100 cycles with a current density of 98mAg<SUP>−1</SUP> between 0.01 and 3.0V. It also showed excellent rate capabilities compared to bare ZnO and previously reported other ZnO-based electrodes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> ZnO impregnated N-doped carbon composite (ZnO/N-CF) is fabricated by using ZIF-8 and mesoporous carbon foam (CF). </LI> <LI> Utilization of ZIF-8 significantly improves the impregnation process due to the hydrophobic interaction with CF matrix. </LI> <LI> The ZnO/N-CF sample shows superior electrochemical properties to those of bare ZnO. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

HOW DO OUR BRAINS PROCESS SUSTAINABILITY? INVESTIGATING COGNITIVE MECHANISM OF SUSTAINABLE FASHION CONSUMPTION

Hanah Choi,DongHyun Kim,Eun-Ju Lee,Jinghe Han,Kyung Hoon Kim,Eunju Ko 글로벌지식마케팅경영학회 2017 Global Fashion Management Conference Vol.2017 No.07

The global society is overwhelmed by growing social inequality and environmental pollution. Especially, the fashion industry has been linked to hazardous clothing wastes and exploitation of labor in poor countries. We acknowledge that the sustainability philosophy could be an alternative governing principle that can lead us to a better future for the fashion industry. This study investigates brain responses of fashion professionals and consumers as they are presented with sustainable fashion of luxury and SPA brands. Using functional magnetic resonance imaging (fMRI), the whole brain responses of participants were measured and analyzed to reveal how their brain responses differ depending on fashion products’ brand type and certification mark. We build an online education platform for professionals and lay consumers on the subject of sustainable fashion. Brain responses are measured from both groups of professionals and consumers while they are exposed to sustainable fashion products of luxury and SPA brands. A group of subjects watch the online educational program while under the counterpart condition subjects see another video of the same length, unrelated to sustainability. BOLD measures are acquired using Siemens 3T scanner and analyzed using SPM 12 software. We find selective brain activation patterns that can distinguish the educated group from the uneducated ones. The practical implication of this study is that we must do our best to build a sustainability education program which can motivate professionals and consumers effectively, by stimulating both cognitive and affective bases of behavioral change.

Evaluation of the MULTISURE HIV Rapid Test in a Korean population with low human immunodeficiency virus prevalence

Kim, Hyeong-Nyeon,Hur, Mina,Kim, Hanah,Moon, Hee-Won,Yun, Yeo-Min,Oh, Eun-Jee,Cho, Young-Sook,Cho, Sung Eun,Cho, Jinhee,Cho, Ah Ra,Park, Seungman De Gruyter 2019 Clinical chemistry and laboratory medicine Vol.57 No.8

Proenkephalin Predicts Organ Failure, Renal Replacement Therapy, and Mortality in Patients With Sepsis

Hanah Kim,Mina Hur,Joachim Struck,Andreas Bergmann,Salvatore Di Somma,GREAT Network 대한진단검사의학회 2020 Annals of Laboratory Medicine Vol.40 No.6

Background: Kidney failure occurs frequently and is associated with high mortality during sepsis. Proenkephalin (PENK) is an emerging biomarker of kidney function. We explored whether PENK levels could predict severity, organ failure, and mortality in septic patients. Methods: We measured the PENK level in the plasma of 215 septic patients using the sphingotest penKid assay (Sphingotec GmbH, Hennigsdorf, Germany). This was analyzed in terms of sepsis severity, vasopressor use, 30-day mortality, sequential organ failure assessment (SOFA) renal subscore, the Chronic Kidney Disease Epidemiology Collaboration estimated glomerular filtration rate (CKD-EPI eGFR) categories, and renal replacement therapy (RRT) requirement. Results: The PENK levels were significantly higher in patients with septic shock, vasopressor use, and non-survivors than in patients with solitary sepsis, no vasopressor use, and survivors, respectively (P=0.02, P=0.007, P<0.001, respectively). The PENK levels were significantly associated with SOFA renal subscore and CKD-EPI eGFR categories (both P<0.001). The distribution of lower eGFR (<60 mL/min/1.73 m2), RRT requirement, SOFA renal subscore, and the number of organ failures differed significantly according to the PENK quartile (P for trend<0.001 or 0.017). The 30-day mortality rate also differed significantly according to the PENK quartile (P for trend<0.001). Conclusions: PENK could be an objective and reliable marker to predict severity, organ failure, and 30-day mortality in septic patients.

Carbon-coated V₂O₅ nanoparticles derived from metal-organic frameworks as a cathode material for rechargeable lithium-ion batteries

Kim, Taegyeong,Kim, Hanah,You, Tae-Soo,Kim, Jongsik Elsevier 2017 Journal of alloys and compounds Vol.727 No.-

<P><B>Abstract</B></P> <P>Carbon-coated V<SUB>2</SUB>O<SUB>5</SUB> nanoparticles were synthesized by a facile synthetic process using as-synthesized MIL-47(V) (MIL-47(V)as) as both vanadium and carbon precursors with controlled heat treatment. The synthesized V<SUB>2</SUB>O<SUB>5</SUB> nanoparticles had a thin (4–6 nm) carbon-coating layer, formed by the controlled thermal decomposition of the carboxylate groups of MIL-47(V)as. The highly crystallized and carbon-coated V<SUB>2</SUB>O<SUB>5</SUB> nanoparticles exhibited an enhanced initial discharge capacity of ∼286 mA h g<SUP>−1</SUP> and good capacity retention of ∼91%, after 50 cycles at a rate of 0.1 C, for voltages in the 2.1–4.0 V range.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Carbon-coated V<SUB>2</SUB>O<SUB>5</SUB> nanocrystals are synthesized by annealing MIL-47 as vanadium and carbon sources. </LI> <LI> The prepared V<SUB>2</SUB>O<SUB>5</SUB> nanocrystals have uniform carbon layers with a thickness of 4–6 nm. </LI> <LI> The carbon-coated V<SUB>2</SUB>O<SUB>5</SUB> nanocrystals show excellent electrochemical properties compared to bare V<SUB>2</SUB>O<SUB>5</SUB> particles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Skein-shaped ZnO/N-doped carbon microstructures as a high performance anode material for lithium-ion batteries

Kim, Hanah,Jae, Woojin,Song, Jungwook,Kim, Jongsik Elsevier 2019 JOURNAL OF ALLOYS AND COMPOUNDS Vol.772 No.-

<P><B>Abstract</B></P> <P>Zinc oxide (ZnO) has significant attentions as an alternative anode material for lithium-ion batteries because of its high theoretical capacity (987 mA h g<SUP>−1</SUP>), lack of toxicity, abundance, and environmental friendliness. In particular, the theoretical capacity of ZnO is almost three times higher than that of the commercial graphite anode (about 372 mA h g<SUP>−1</SUP>) as a result of its alloying and conversion reactions with lithium ions. However, severe capacity fading and poor reaction kinetics are often caused by the low electrical conductivity, slow lithium-ion diffusion, and large volume changes of ZnO during repeated charge/discharge processes. To overcome these drawbacks, N-doped carbon-coated ZnO microstructures are synthesized through a facile hydrothermal reaction and the subsequent calcination process using citric acid and urea as carbon and nitrogen sources, respectively. The ZnO sample has a hierarchical skein-shaped morphology and exhibits a higher discharge capacity of about 1047 mA h g<SUP>−1</SUP> after 100 cycles at a 0.1 C rate in the 0.01–3.0 V voltage range, compared to those of bare ZnO and carbon-coated ZnO samples (about 42 and 341 mA h g<SUP>−1</SUP> after 100 cycles, respectively).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Skein-shaped ZnO/NC microstructures are fabricated by a facile hydrothermal method. </LI> <LI> Citric acid and urea are used as both C and N sources and morphology controllers. </LI> <LI> The ZnO/NC exhibits the significantly improved electrochemical performances. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Absolute Change in High-Sensitivity Cardiac Troponin I at Three Hours After Presentation is Useful for Diagnosing Acute Myocardial Infarction in the Emergency Department

Jong Won Kim,Hanah Kim,Yeo-Min Yun,Kyeong Ryong Lee,Hyun-Joong Kim 대한진단검사의학회 2020 Annals of Laboratory Medicine Vol.40 No.6

Background: A rise and/or fall in cardiac troponin value with at least one value above the 99th percentile upper reference limit is essential for acute myocardial infarction (AMI) diagnosis. We evaluated the clinical usefulness of serial high-sensitivity cardiac troponin I (hs-cTnI) measurements in AMI diagnosis, in terms of the predictability of absolute and relative changes. Methods: For this retrospective, forward observational study, we enrolled 281 patients older than 18 years who presented with chest pain at the emergency department (ED) between August 2015 and December 2016. The patients were grouped as AMI and non-AMI, and 73 (26%) were diagnosed as having AMI. Hs-cTnI (Abbott Diagnostics, Abbott Park, IL, USA) was measured at presentation and 3 hours later. We assessed the diagnostic performance of the absolute and relative changes in hs-cTnI. Results: The cut-off values to predict AMI were 16.2 ng/L and 42.1% for the absolute and relative hs-cTnI changes, respectively. The area under the curve of hs-cTnI for AMI diagnosis was larger for absolute changes than for relative changes [0.96 (95% confidence interval [CI], 0.92–0.98) vs 0.89 (95% CI, 0.85–0.93)] (P=0.014). Conclusions: The absolute hs-cTnI change at 3 hours after presentation was superior to the relative change, and a rise and/or fall in hs-cTnI of >16.2 ng/L at 3 hours after presentation was useful to identify AMI in patients presenting at the ED.

FeOF ellipsoidal nanoparticles anchored on reduced graphene oxides as a cathode material for sodium-ion batteries

Park, Miji,Shim, Jae-Hyun,Kim, Hanah,Park, Hansol,Kim, Namyeong,Kim, Jongsik Elsevier 2018 Journal of Power Sources Vol.396 No.-

<P><B>Abstract</B></P> <P>FeOF/reduced graphene oxide (r-GO) nanocomposites are synthesized with approximately 8 and 13 wt% r-GO. The FeOF nanoparticles are fabricated using FeSiF<SUB>6</SUB>⋅6H<SUB>2</SUB>O as a precursor through solvothermal treatment with 1-propanol. This method provides a more reliable and facile wet-chemical route to synthesize phase-pure FeOF without FeF<SUB>2</SUB> and Fe<SUB>2</SUB>O<SUB>3</SUB> impurities, as compared to the annealing process in air. The FeF<SUB>2</SUB> phase is formed as an intermediate during the synthetic process. The prepared FeOF/r-GO sample with 13 wt% r-GO (FeG20) exhibits improved discharge capacity, cycling stability, and rate performance as a cathode material in sodium-ion batteries, compared to the bare FeOF at 1.2–4.0 V. The enhanced electrochemical properties for sodium-ion storage are mainly attributed to the size-controlled FeOF nanoparticles and their intimate contact with the conductive r-GO matrix.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ellipsoidal FeOF nanoparticles anchored on r-GO were fabricated in a mild condition. </LI> <LI> The particle size of FeOF was decreased with the r-GO contents in the FeOF/r-GO composites. </LI> <LI> The FeOF/r-GO composites show superior electrochemical performances to those of bare FeOF. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Biomarker Rule-in or Rule-out in Patients With Acute Diseases for Validation of Acute Kidney Injury in the Emergency Department (BRAVA): A Multicenter Study Evaluating Urinary TIMP-2/IGFBP7

Yang Hyun Suk,Hur Mina,Lee Kyeong Ryong,Kim Hanah,Kim Hahn Young,Kim Jong Won,Chua Mui Teng,Kuan Win Sen,Kuan Win Sen,Kitiyakara Chagriya,Phattharapornjaroen Phatthranit,Chittamma Anchalee,Werayachank 대한진단검사의학회 2022 Annals of Laboratory Medicine Vol.42 No.2

Background: Urine tissue inhibitor of metalloproteinases-2/insulin-like growth factor-binding protein 7 (TIMP-2/IGFBP7) (NephroCheck, Ortho Clinical Diagnostics, Raritan, NJ, USA) is a US Food and Drug Administration-approved biomarker for risk assessment of acute kidney injury (AKI) in critically ill adult patients in intensive care units; however, its clinical impact in the emergency department (ED) remains unproven. We evaluated the utility of NephroCheck for predicting AKI development and short-term mortality in the ED. Methods: This was a prospective, observational, five-center international study. We consecutively enrolled ED patients admitted with ≥30% risk of AKI development (assessed by ED physician: ED score) or acute diseases. Serum creatinine was tested on ED arrival (T0), day 1, and day 2 (T48); urine for NephroCheck was collected at T0 and T48. We performed ROC curve and reclassification analyses. Results: Among the 529 patients enrolled (213 females; median age, 65 years), AKI developed in 59 (11.2%) patients. The T0 NephroCheck value was higher in the AKI group than in the non-AKI group (median 0.77 vs. 0.29 (ng/m)2/1,000, P=0.001), and better predicted AKI development than the ED score (area under the curve [AUC], 0.64 vs. 0.53; P=0.04). In reclassification analyses, adding NephroCheck to the ED score improved the prediction of AKI development (P<0.05). The T0 NephroCheck value predicted 30-day mortality (AUC, 0.68; P<0.001). Conclusions: NephroCheck can predict both AKI development and short-term mortality in at-risk ED patients. NephroCheck would be a useful biomarker for early ruling-in or ruling-out of AKI in the ED.

연구개발비 투자 불균형이 경제성장에 미치는 영향

조하나 ( Hanah Cho ),김준기 ( Junki Kim ) 중앙대학교 국가정책연구소 2020 국가정책연구 Vol.34 No.1

본 연구에서는 1990년에서 2017년도 사이 39개 국가의 연구개발비 분류에 따른 R&D 투자의 불균형이 경제성장에 미치는 영향을 살펴보았다. R&D 불균형은 국가별 R&D 투자액을 재원별(정부, 기업, 외국, 그 외 국내지원), 수행주체별(정부, 기업, 대학, 비영리), 유형(기초연구, 응용 연구, 개발연구)으로 구분하여 각각의 Gini 값을 구한 것이다. 결과적으로 R&D 재원별, 수행주체별, 유형별 투자 불균형은 인당 국내총생산에 부(-)의 영향을 미치는 것으로 나타났으며 이는 국가의 경제적 수준 및 시차에 따라서도 유의미한 차이가 있는 것으로 나타났다. 재원별 투자 불균형의 부정적 효과는 경제수준이 더 높은 국가들에서 크게 나타났으며 반대로 수행주체별 투자 불균형의 부정적 효과는 경제수준이 상대적으로 낮은 국가들에게서 더 크게 나타났다. 유형별 투자 불균형의 부정적 효과는 경제수준이 더 높은 국가들에게서 크게 나타났다. 이러한 결과는 R&D 투자가 재원별, 수행주체별, 유형별로 비교적 고르게 이루어지는 것이 경제성장에 도움이 되며 국가의 경제적 수준에 따라 그에 맞는 R&D 투자 전략이 필요함을 시사한다. This paper investigates the effects of R&D disparity on economic growth in 39 countries from 1990 to 2017. R&D disparity refers to the level of inequality in R&D expenditures distributed within R&D financing and performing sectors and types of research, measured by Gini Index. Using a fixed effect regression analysis, we found that the disparity of R&D expenditures negatively affects countries’ GDP per capita and its impacts vary by sectors, types of research as well as countries’ economic status. The negative impact of the disparity in R&D financing sector is twice as greater in the advanced countries than in the less advanced countries. On the other hand, the negative impact of the disparity in R&D performing sectors appears more severe in the less advanced countries than in the more advanced countries. Also, the disparity by types of R&D activities has a greater impact in the advanced countries than in the less advanced countries. Our findings suggest that R&D should be promoted more evenly across the sectors and types of research, and countries need different R&D investment strategies depending on their economic status.