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Effects of nanopores and sulfur doping on hierarchically bunched carbon fibers to protect lithium metal anode

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Carbon Energy 2021年第5期3卷 784-794页

作者： ji In Jung Sunwoo Park Son Ha Se youn Cho Hyoung-Joon jin young Soo Yun Program in Environmental and Polymer Engineering Inha UniversityIncheonSouth Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoulSouth Korea Carbon Composite Materials Research Center Korea Institute of Science and TechnologyWanju-gunJeollabuk-doSouth Korea Department of Polymer Science and Engineering Inha UniversityIncheonSouth Korea Department of Integrative Energy Engineering Korea UniversitySeoulSouth Korea

Studies on three-dimensional structured carbon templates have focused on how to guide homogeneous lithium metal nucleation and growth for lithium metal anodes(LMAs).However,there is still insufficient evidence for a key factor to achieve their high electrochemical ***,the effects of nanopores and sulfur doping on carbon-based nanoporous host(CNH)electrode materials for LMAs were investigated using natural polymer-derived *** pore-filling behaviors of lithium metal in the nanopores of the CNH electrode materials were first observed by ex situ scanning electron microscopy analysis,where the protective lithium metal nucleation and growth process led to significantly high Coulombic efficiency(CE)of~99.4%and stable 600 *** addition,a comparison study of CNH and sulfurdoped CNH(S-CNH)electrodes,which differ only in the presence or absence of sulfur,revealed that sulfur doping can cause lower electrochemical series resistance,higher CE value,and better cycling stability in a wide range of current densities and number of ***,S-CNH-based LMAs showed high electrochemical performance in full-cell Li-S battery tests using a sulfur copolymer cathode,where a high energy density of 1370Wh kgelectrode−1 and an excellent power density of 4120Wkgelectrode−1 were obtained.

关键词： carbon template Li-S batteries lithium metal anode lithium metal batteries nanoporous carbon sulfur doping

Undifferentiated pleomorphic sarcoma of the liver presenting as a unilocular cyst

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Hepatobiliary & Pancreatic Diseases International 2009年第5期8卷 541-543页

作者： hyun-Soo Kim Gou young Kim Sung-jig Lim Sang Mok Lee youn Wha Kim Departments of Pathology School of MedicineKyung Hee University1 Hoegi-dongDongdaemun-gu130-702 SeoulSouth Korea Departments of Surgery School of MedicineKyung Hee University1 Hoegi-dongDongdaemun-gu130-702 SeoulSouth Korea

BACKGROUND:A malignant fibrous histiocytoma,recently referred to as an undifferentiated pleomorphic sarcoma (UPS),is very rare in the liver,and only 34 cases of primary hepatic malignant fibrous histiocytoma have been reported in the English literature. METHODS:We report a rare case of a hepatic UPS presenting as a unilocular cystic lesion with respect to histopathologic features,the newly revised diagnostic criteria,and the differential diagnosis. RESULTS:A 60-year-old man presented for evaluation of epigastric pain of 7 months *** computed tomography revealed a hypodense,unilocular cystic mass in the right lobe of the liver,measuring 14.0×11.1 cm.A right lobectomy was ***,the cut surface showed a single,well-circumscribed unilocular cystic tumor mass containing dark red-brown necrotic debris and blood clots, which occupied most of the ***,the tumor consisted of haphazardly arranged mononuclear pleomorphic tumor cells,admixed with abundant osteoclast- like multinucleated giant ***,the tumor cells expressed vimentin *** histopathologic and immunohistochemical findings were compatible with a *** patient is alive and well 41 months after surgery without recurrence. CONCLUSIONS:Clinically,most of the hepatic UPSs are solid *** two cases have presented as multilocular cystic masses.A primary hepatic UPS presenting as a unilocular cyst has never been reported.A UPS should be included in the differential diagnosis of unilocular cystic lesions in the liver.

关键词： undifferentiated pleomorphic sarcoma malignant fibrous histiocytoma liver unilocular cyst

Proactive eviction of flow entry for SDN based on hidden Markov model

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Frontiers of Computer Science 2020年第4期14卷 107-116页

作者： Gan HUANG Hee Yong youn College of Software Sungkyunkwan UniversitySuwon440746Korea

With the fast development of software defined network(SDN),numerous researches have been conducted for maximizing the performance of ***,flow tables are utilized in OpenFlows witch for *** to the space limitation of flow table and switch capacity,various issues exist in dealing with the *** existing schemes typically employ reactive approach such that the selection of evicted entries occurs when timeout or table miss *** this paper a proactive approach is proposed based on the prediction of the probability of matching of the *** eviction occurs proactively when the utilization of flow table exceeds a threshold,and the flow entry of the lowest matching probability is *** matching probability is estimated using hidden Markov model(HMM).Computersimulation reveals that it significantly enhances the prediction accuracy and decreases the number of table misses compared to the standard Hard timeout scheme and Flow master scheme.

关键词： SDN OpenFlow flow entry eviction HMM matching probability

Strong enhancement of magnetic order from bulk to stretched monolayer FeSe as Hund’s metals

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npj Computational Materials 2020年第1期6卷 448-453页

作者： Chang-youn Moon Advanced Instrumentation Institute Korea Research Institute of Standards and ScienceYuseongDaejeonRepublic of Korea

Despite of the importance of magnetism in possible relation to other key properties in iron-based superconductors,its understanding is still far from complete especially for FeSe *** one hand,the origin of the absence of magnetic orders in bulk FeSe is yet to be *** the other hand,it is still not clear how close monolayer FeSe on SrTiO_(3),with the highest transition temperature among iron-based superconductors,is to a magnetic *** we investigate magnetic properties of bulk and monolayer FeSe using dynamical mean-field theory combined with density-functional *** find that suppressed magnetic order in bulk FeSe is associated with the reduction of interorbital charge fluctuations,an effect of Hund’s coupling,enhanced by a larger crystal-field ***,spatial isolation of Fe atoms in expanded monolayer FeSe leads into a strong magnetic order,which is completely destroyed by a small electron *** work provides a comprehensive understanding of the magnetic order in iron-based superconductors and other general multi-orbital correlated systems as Hund’s metals.

关键词： theory monolayer orbital

The Climate Variabilities of Air Temperature Around the Korean Peninsula

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Advances in Atmospheric Sciences 2005年第4期22卷 575-584页

作者： Yong-Hoon youn Meteorological Research Institute/Korean Meteorological Administration Seoul Korea

In this study, changes in climatological conditions around the KoreanPeninsula are estimated quantitatively using various types of high order statistical analyses. Thetemperature data collected from Incheon station have been analyzed for the assessment of the climatevariation. According to our analysis, the climate changes observed over the Korean Peninsula forthe last century are similar to the global observational data in many respects. First of all, thewarming trend [+1.5℃ (100 yr)^(-1)] and the overall evolving pattern throughout the century axequite similar to each other. The temperature change in the Korean Peninsula is about two to threetimes larger than that of the global scale which may partially be ascribed to the influence ofurbanization at mid and high latitudes. In this work, a new Winter Monsoon Index (WMI) is suggestedbased on the European continental scale circulation index (EU1) pattern. Our WMI is defined as thenormalized sea level pressure (SLP) difference in the winter period between the centers of the EastSea and west of Lake Baikal in Siberia, the two eastern centers of the EU1 action patterns. A strongsimilarity is found between the time series of the WMI and surface air temperature at Incheon. TheWMI has decreased gradually since the 1920s but has shifted to a rapid increasing trend in the lasttwo decades; it was in fact accompanied by a weakening of the Siberian High and a decreasing of thenortherly during winter. Our findings of the close correlations between the surface air temperatureat Incheon and the WMI strongly indicate that our newly suggested index is unique and can be used asan efficient tool to predict climate variability in Korea.

关键词： winter monsoon index climate variability

Enhancing ammonia production rates from electrochemical nitrogen reduction by engineering three-phase boundary with phosphorus-activated Cu catalysts

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Journal of Energy Chemistry 2023年第9期84卷 394-401页

作者： Jeehye Kim Cho Hee Lee Yong hyun Moon Min Hee Lee Eun Hyup Kim Sun Hee Choi youn Jeong Jang Jae Sung Lee School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea Department of Chemical Engineering Hanyang UniversitySeoul 04763Republic of Korea Pohang Accelerator Laboratory(PAL) Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea

Electrochemical N_(2) reduction reaction(eNRR) over Cu-based catalysts suffers from an intrinsically low activity of Cu for activation of stable N_(2) molecules and the limited supply of N_(2) to the catalyst due to its low solubility in aqueous ***,we propose phosphorus-activated Cu electrocatalysts to generate electron-deficient Cu sites on the catalyst surface to promote the adsorption of N_(2) *** eNRR system is further modified using a gas diffusion electrode(GDE) coated with polytetrafluoroethylene(PTFE) to form an effective three-phase boundary of liquid water-gas N_(2)-solid catalyst to facilitate easy access of N_(2) to the catalytic *** a result,the new catalyst in the flow-type cell records a Faradaic efficiency of 13.15% and an NH_(3) production rate of 7.69 μg h^(-1) cm^(-2) at-0.2 V_(RHE),which represent 3.56 and 59.2 times increases from those obtained with a pristine Cu electrode in a typical electrolytic *** work represents a successful demonstration of dual modification strategies;catalyst modification and N_(2) supplying system engineering,and the results would provide a useful platform for further developments of electrocatalysts and reaction systems.

关键词： Electrochemical nitrogen reduction reaction Ammonia production Phosphorous modified copper electrodes Gas diffusion electrodes Three-phase boundary PTFE coating

Effect of lifestyle modification on hepatocellular carcinoma incidence and mortality among patients with chronic hepatitis B

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World Journal of Gastroenterology 2023年第24期29卷 3843-3854页

作者： Yewan Park Danbee Kang Dong hyun Sinn hyunsoo Kim Yun Soo Hong Juhee Cho Geum-youn Gwak Department of Internal Medicine Kyung Hee University HospitalSeoul 02447South Korea Department of Digital Health SAIHSTSungkyunkwan UniversitySeoul 06355South Korea Department of Clinical Research Design and Evaluation SAIHSTSungkyunkwan UniversitySeoul 06355South Korea Center for Clinical Epidemiology Samsung Medical CenterSungkyunkwan UniversitySeoul 06351South Korea Department of Medicine Samsung Medical CenterSungkyunkwan University School of MedicineSeoul 06351South Korea Departments of Epidemiology and Medicine and Welch Center for PreventionEpidemiology and Clinical ResearchJohns Hopkins Medical InstitutionsBaltimoreMD 21287United States

BACKGROUND Research exploring the influence of healthier lifestyle modification(LSM)on the risk of hepatocellular carcinoma(HCC)in patients with chronic hepatitis B(CHB)is *** To emulate a target trial to determine the effect of LSM on HCC incidence and mortality among patients with CHB by large-scale population-based observational *** Among the patients with CHB enrolled in the Korean National Health Insurance Service between January 1,2009,and December 31,2017,those aged≥20 years who drank alcohol,smoked cigarettes,and were sedentary were *** included at least one LSM,including alcohol abstinence,smoking cessation,and regular *** primary outcome was HCC development,and the secondary outcome was liver-related *** used 2:1 propensity score matching to account for *** With 48766 patients in the LSM group and 103560 in the control group,the adjusted hazard ratio(HR)for incident HCC and liver-related mortality was 0.92[95%confidence interval(CI):0.87-0.96]and 0.92(95%CI:0.86-0.99)in the LSM group,respectively,compared with the control *** the LSM group,the adjusted HR(95%CI)for incident HCC was 0.84(0.76-0.94),0.87(0.81-0.94),and 1.08(1.00-1.16)for alcohol abstinence,smoking cessation,and regular exercise,*** adjusted HR(95%CI)for liver-related mortality was 0.92(0.80-1.06),0.81(0.72-0.91),and 1.15(1.04-1.27)for alcohol abstinence,smoking cessation,and regular exercise,*** LSM lowered the risk of HCC and mortality in patients with ***,active LSM,particularly alcohol abstinence and smoking cessation,should be encouraged in patients with CHB.

关键词： Lifestyle modification Chronic hepatitis B Hepatocellular carcinoma Cancer Mortality

Chorioamnionitis caused by Serratia marcescens in a healthcare worker: A case report

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World Journal of Clinical Cases 2021年第20期9卷 5689-5694页

作者： Sue youn Park Min ji Kim Sanghee Park Nah Ihm Kim hyung Hoon Oh Joungmin Kim Department of Anesthesiology and Pain Medicine Chonnam National University Medical SchoolGwangju 61469South Korea Department of Pathology Chonnam National University Medical SchoolGwangju 61469South Korea Department of Internal Medicine Chonnam National University Medical SchoolGwangju 61469South Korea

BACKGROUND Healthcare workers(HCWs)are at an increased risk for exposure to *** marcescens(***)is a gram-negative,opportunistic and nosocomial pathogen belonging to the Enterobacterieae family.A few case reports have been published of chorioamnionitis caused by *** *** changes during pregnancy can also affect the risk of ***,few studies have examined hospital-acquired bacterial infection in pregnant *** SUMMARY A 33-year-old woman,a resident in anesthesiology,was admitted at 14 wk gestation for fever with *** had no medical history other than contact dermatitis of both hands that started from the beginning of the *** was no obvious infection focus and no bacterial growth in blood *** was discharged after 1 wk of empirical antibiotic *** three weeks before the fever started,she had a blister on the site of contact dermatitis on both hands,she applied antibiotic ointment for three days and the blisters had *** 19 wk gestation,she had a high fever and was *** examination and image studies were nonspecific and the patient had no other *** grew in blood cultures at 19 wk *** with intravenous antibiotics was ***,she suffered a miscarriage at 224/7 wk ***,the amniotic membrane showed chorioamnionitis with a focal ***,a placenta tissue culture grew *** HCWs can be exposed to pathogens that can cause opportunistic infections such as *** affects the immune system,making it susceptible to opportunistic ***,pregnant HCWs may require more preventive measures,including hand hygiene and avoid risk factors(*** the skin).

关键词： Serratia marcescens Chorioamnionitis Healthcare workers Pregnancy Case report

Effects of tissue-cultured mountain ginseng （Panax ginseng CA Meyer） extract on male patients with erectile dysfunction

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Asian Journal of Andrology 2009年第3期11卷 356-361页

作者： Tae-Hwan Kim Seung hyun Jeon Eun-Joo Hahn Kee-Yoeup Paek Jong Kwan Park Nae young youn hyung-Lae Lee Department of Urology School of Medicine Kyung Hee University Seoul 134-727 Korea Research Center for the Development of Advanced Horticultural Technology Chungbuk National University Cheongju 361-711 Korea Department of Urology Chonbuk National University Medical School Jeonju 561-712 Korea Infertility Clinic Sanbornjeil Women＇s Hospital Kunpo 435-042 Korea

Korean ginseng and mountain ginseng （Panax ginseng CA Meyer） are important traditional herbal plants whose ginsenosides are generally accepted as serving to improve sexual functions, such as penile erection. We investigated the effects of tissue-cultured mountain ginseng extract （TMGE） on male patients with erectile dysfunction （ED）. A double-blind, placebo-controlled study was conducted with 143 patients experiencing ED. Over the course of 8 weeks, one group took 1 000 mg of TMGE twice a day, and the other group took 1 000 mg of placebo twice a day. The effects of the TMGE and the placebo were analyzed using the Korean version of the International Index of Erectile Function （IIEF） questionnaire. A total of 86 patients completed 8 weeks of treatment. The scores on the five domains of the IIEF after medication were significantly higher than the baseline scores in the group treated with TMGE （P 〈 0.05）, whereas no significant improvement was observed in the placebo group （P 〉 0.05）. Erectile function and overall satisfaction scores after medication were significantly higher in the TMGE group than in the placebo group （P 〈 0.05）. Erectile function of patients in the TMGE-treated group significantly improved, suggesting that TMGE could be utilized for improving erectile function in male patients.

关键词： erectile dysfunction Panax ginseng tissue-cultured mountain ginseng extract