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Nano-Micro Letters 2022年第11期14卷 307-323页

作者： Jong-hoon lee Yoon-Sub Kim Hea-Jin Ru Seul-Yi lee soo-Jin Park Department of Chemistry Inha University100 InharoIncheon 22212Korea Korea Architecture Safety Testing and Research Institute(KASTI) 88 Gasan Digital 1-roSeoul 08590Korea

Epoxy-based nano-composites can be ideal electromagnetic interference(EMI)-shielding materials owing to their lightness,chemical inertness,and mechanical ***,poor conductivity and brittleness of the epoxy resin are challenges for fast-growing portable and flexible EMI-shielding applications,such as smart wristband,medical cloth,aerospace,and military *** this study,we explored hybrid nanofillers of single-walled carbon nanotubes(SWCNT)/reduced graphene oxide(rGO)as conductive inks and polyester fabrics(PFs)as a substrate for flexible EMI-shielding *** highest electrical conductivity and fracture toughness of the SWCNT/rGO/PF/epoxy composites were 30.2 S m^(−1)and 38.5 MPa m^(1/2),which are~270 and 65%enhancement over those of the composites without SWCNTs,*** mechanical durability was demonstrated by stable electrical conductivity retention during 1000 cycles of bending *** EMI-shielding effectiveness of~41 dB in the X-band frequency of 8.2-12.4 GHz with a thickness of 0.6 mm was obtained with an EM absorption-dominant behavior over a 0.7 absorption *** results are attributed to the hierarchical architecture of the macroscale PF skeleton and nanoscale SWCNT/rGO networks,leading to superior EMI-shielding *** believe that this approach provides highly flexible and robust EMI-shielding composites for next-generation wearable electronic devices.

关键词： Conductive polymer composites Fracture toughness Flexible composites Absorption-dominated electromagnetic interference shielding

The association between C-reactive protein to albumin ratio and 6-month neurological outcome in patients with in-hospital cardiac arrest

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World Journal of Emergency Medicine 2024年第3期15卷 223-228页

作者： Ji ho lee Dong Hun lee Byung Kook lee Seok Jin Ryu Department of Emergency Medicine Chonnam National University HospitalGwangju 61469Republic of Korea Department of Emergency Medicine Chonnam National University Medical SchoolGwangju 61469Republic of Korea

The global incidence rates of in-hospital cardiac arrest(IHCA)range from1.2 to 9.0 per1,000 hospitalized patients,as per the National Cardiac Arrest Database.[1] While IHCAs tend to exhibit superior 30-day survival rates relative to out-of-hospital cardiac arrests (OHCA) due to situational advantages,such as immediate access to medical personnel and treatments.

关键词： patients cardiac IHC

Memristive Devices Based on Two-Dimensional Transition Metal Chalcogenides for Neuromorphic Computing

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Nano-Micro Letters 2022年第4期14卷 29-58页

作者： Ki Chang Kwon Ji Hyun Baek Kootak hong soo Young Kim ho Won Jang Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoul 08826Republic of Korea Interdisciplinary Materials Measurement Institute Korea Research Institute of Standards and Science(KRISS)Daejeon 34133Republic of Korea Department of Materials Science and Engineering Institute of Green Manufacturing TechnologyKorea UniversitySeoul 02841Republic of Korea Advanced Institute of Convergence Technology Seoul National UniversitySuwon 16229Korea

Two-dimensional(2D)transition metal chalcogenides(TMC)and their heterostructures are appealing as building blocks in a wide range of electronic and optoelectronic devices,particularly futuristic memristive and synaptic devices for brain-inspired neuromorphic computing *** distinct properties such as high durability,electrical and optical tunability,clean surface,flexibility,and LEGO-staking capability enable simple fabrication with high integration density,energy-efficient operation,and high *** review provides a thorough examination of high-performance memristors based on 2D TMCs for neuromorphic computing applications,including the promise of 2D TMC materials and heterostructures,as well as the state-of-the-art demonstration of memristive *** challenges and future prospects for the development of these emerging materials and devices are also *** purpose of this review is to provide an outlook on the fabrication and characterization of neuromorphic memristors based on 2D TMCs.

关键词： Two-dimensional materials Memristors Neuromorphic computing Artificial synapses Transition metal chalcogenides

Food intolerance and skin prick test in treated and untreated irritable bowel syndrome

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World Journal of Gastroenterology 2006年第15期12卷 2382-2387页

作者： Dae-Won Jun Oh-Young lee ho-Joo Yoon Seok-Hwa lee Hang-Lak lee ho-soon Choi Byung-Chul Yoon Min-ho lee Dong-hoo lee Sang-hoen Cho Department of Internal Medicine College of Medicine Hanyang UniversitySeoulKorea Department of Food and Nutrition College of Human Ecology Hanyang UniversitySeoulKorea Department of Internal Medicine College of Medicine Seoul National UniversitySeoulSouth Korea

AIM： To correlate the clinical features of treated and untreated patients with irritable bowel syndrome （IBS） to the results of skin prick test （SPT） for food and inhalant allergens. METhoDS： We recruited 105 subjects to form three different target groups： treated group （n=44） undergoing treatment for IBS, untreated group （n =31） meeting the Rome Ⅱ criteria without treatment for IBS, control group （n = 30） with no IBS symptoms. RESULTS： SPT results were different among the three groups in which SPT was positive in 17 （38.6%） treated patients, in 5 （16.1%） untreated patients and in 1 （3.3%） control （P〈0.01）. The number of positive SPTs was greater in the IBS group than in the control group （P〈 0.001）. The number of positive food SPTs was higher in the treated IBS group than in the untreated IBS group （P= 0.03）. CONCLUSION： Positive food SPT is higher in IBS patients than in controls.

关键词： Irritable bowel syndrome Skin prick test Food allergy

Comparative analysis on homogeneity of Pb and Cd in epoxy molding compounds

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Transactions of Nonferrous Metals Society of China 2011年第A1期21卷 160-164页

作者： Kyun-Gmee lee Yong-Keun SON Jin-sook lee Tai-Min NOH Hee-soo lee Department of Chemistry Sungkyunkwan University Department of Chemistry Yonsei University School of Materials Science and Engineering Pusan National University

Reference materials for quantitative determination of regulated heavy metals, such as Pb and Cd in electronic components, were designed and investigated in terms of stability and homogeneity. Reference materials with two concentration levels of heavy metals were prepared by spiking Pb and Cd compounds to epoxy molding compounds made by mixing silica powders and epoxy resin. The concentration changes of the reference materials during stability test for 1 a were not observed. In the homogeneity assessment, the as-prepared reference materials were studied by using three different analytical tools, inductively coupled plasma atomic emission spectrometry (ICP-AES), X-ray fluoroescence spectrometry (XRF) and laser ablation ICP mass. The results show different homogeneities by the characteristics of analytical tools and the materials.

关键词： epoxy molding compound Pb Cd reference materials homogeneity

Scalp Acupuncture for Parkinson's Disease:A Systematic Review of Randomized Controlled Trials

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Chinese Journal of Integrative Medicine 2013年第4期19卷 297-306页

作者： Hun-soo lee Hye-Lim Park Seung-Jin lee Byung-Cheul Shin Jun-Yong Choi Myeong soo lee School of Korean Medicine Pusan National UniversityYangsanSouth Korea School of Korean Medical Science Pusan National University YangsanSouth Korea hospital of Korean Medicine Pusan National UniversityYangsanSouth Korea School of Korean Medical Science Pusan National UniversityYangsanSouth Korea Medical Research Division Korea Institute of Oriental MedicineDaejeonSouth Korea

Objective： To evaluate the effectiveness of scalp acupuncture （SA）, a modern acupuncture technique specialized to neurological disorders, in managing motor function and symptoms for Parkinson＇s disease （PD） patients. Methods： Two independent reviewers extracted data from all of the randomized clinical trials （RCTs） that assessed the efficacy of SA for PD compared with conventional therapies （CTs）. Sixteen electronic databases were searched. The risk of bias was appraised with the Cochrane Collaboration tool, and the reporting of the included studies was evaluated by the Consolidated Standards of Reporting Trials （CONSORT） 2010 checklist and the revised Standards for Reporting Interventions in Clinical Trials of Acupuncture （STRICTA） guidelines. Results： In total, 4 RCTs met the inclusion criteria. As assessed by the Unified PD Rating Scale （UPDRS）, 2 RCTs showed that SA combined with CTs proved superior to CTs alone [60 cases; weighted mean difference, -3.94; 95% confidence interval （CI）, -6.05 to -1.64, P=0.01; 12=0%]. Based on the Webster scale, however, 3 RCTs showed no superior effect of SA when combined with CTs with high heterogeneity （154 cases; risk ratio, 1.29; 95% CI, 0.79 to 2.12, P=0.30; 12=84%）. The Cochrane risk of bias, adherence to the CONSORT and the STRICTA checklist showed that the quality of all the included RCTs was generally low. Conclusions： The result of our systematic review and meta-analysis suggested that the effectiveness of SA for PD is promising, however, the evidence is not convincing. A sham-controlled RCT design that adheres to the CONSORT and STRICTA guidelines to overcome methodological weakness and that includes a large sample size is strongly recommended to confirm the precise effect of SA on PD.

关键词： scalp acupuncture Parkinson's disease randomized controlled trials systematic review metaanalysis

Surface-roughened current collectors for anode-free all-solid-state batteries

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Journal of Energy Chemistry 2022年第7期31卷 248-257,I0007页

作者： Donghee Gu Hyoungchul Kim Jong-ho lee Sangbaek Park Energy Materials Research Center Korea Institute of Science and Technology(KIST)Seoul 02792.Republic of Korea School of Civil Environmental and Architectural EngineeringKorea University.Seoul 02841.Republic of Korea Division of Nanoscience and Technology University of Science and Technology(UST)Seoul02792.Republicof Korea Department of Materials Science and Engineering Chungnam National UniversityDaejeon 34134.Republic of Korea

Anode-free all-solid-state batteries(AFASSBs), composed of a fully lithiated cathode and a bare current collector(CC) that eliminates excess lithium, can maximize the energy density(because of a compact cell configuration) and improve the safety of solid-state systems. Although significant progress has been made by modifying CCs in liquid-based anode-free batteries, the role of CCs and the mechanism of Li formation on CCs in AFASSBs are still unexplored. Here, we systematically investigate the effect of the surface roughness of the CCs on the Li plating/stripping behavior in AFASSBs. The results show that the moderately roughened CC substantially improves the Coulombic efficiency and cycle stability of AFASSBs owing to the increased contact points between the solid electrolyte and the roughened CC. In contrast, the excessively roughened CC deteriorates the performance owing to the contact ***, an ex situ interface analysis reveals that the roughened surface of the CC could suppress the interfacial degradation during the Li ion extraction from a sulfide solid electrolyte to a CC. This provides an indication to the origin that hinders the electrochemical performance of AFASSBs. These findings show the potential for the application of surface-engineered CCs in AFASSBs and provide guidelines for designing advanced CCs.

关键词： Anode-free Solid-state batteries Current collectors Surface roughness Li formation

Dynamic deformation behavior and microstructural evolution during high-speed rolling of Mg alloy having non-basal texture

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Journal of Materials Science & Technology 2019年第4期35卷 473-482页

作者： Sang-hoon Kim Jeong Hun lee Chong soo lee Jonghun Yoon Sung Hyuk Park School of Materials Science and Engineering Kyungpook National University Ulsan Regional Division Korea Institute of Industrial Technology Graduate Institute of Ferrous Technology Pohang University of Science and Technology Department of Mechanical Engineering Hanyang University

The dynamic deformation behaviors and resultant microstructural variations during high-speed rolling(HSR) of a Mg alloy with a non-basal texture are investigated. To this end, AZ31 alloy samples in which the basal poles of most grains are predominantly aligned parallel to the transverse direction(TD) are subjected to hot rolling with different reductions at a rolling speed of 470 m/min. The initial grains with a TD texture are favorable for {10–12} twinning under compression along the normal direction(ND); as a result, {10–12} twins are extensively formed in the material during HSR, and this consequently results in a drastic evolution of texture from the TD texture to the ND texture and a reduction in the grain size. After the initial grains are completely twinned by the {10–12} twinning mechanism, {10–11} contraction twins and {10–11}-{10–12} double twins are formed in the {10–12} twinned grains by further *** the contraction twins and double twins have crystallographic orientations that are favorable for basal slip during HSR, dislocations easily accumulate in these twins and fine recrystallized grains nucleate in the twins to reduce the increased internal strain energy. Until a rolling reduction of 20%, {10–12}twinning is the main mechanism governing the microstructural change during HSR, and subsequently,the microstructural evolution is dominated by the formation of contraction twins and double twins and the dynamic recrystallization in these twins. With an increase in the rolling reduction, the average grain size and internal strain energy of the high-speed-rolled(HSRed) samples decrease and the basal texture evolves from the TD texture to the ND texture more effectively. As a result, the 80% HSRed sample, which is subjected to a large strain at a high strain rate in a single rolling pass, exhibits a fully recrystallized microstructure consisting of equiaxed fine grains and has an ND basal texture without a TD texture component.

关键词： Magnesium alloy High-speed rolling Texture Dynamic recrystallization Twinning

Effects of TiC on the microstructure refinement and mechanical property enhancement of additive manufactured Inconel 625/TiC metal matrix composites fabricated with novel core-shell composite powder

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Journal of Materials Science & Technology 2023年第33期164卷 13-26页

作者： Taegyu lee Wonjong Jeong SeungHyeok Chung ho Jin Ryu Department of Materials Science and Engineering Korea Advanced Institute of Science and TechnologyYu Seong-GuDae Hak-Ro 29134141 DaejeonRepublic of Korea Department of Nuclear and Quantum Engineering Korea Advanced Institute of Science and TechnologyYu Seong-GuDae Hak-Ro 29134141 DaejeonRepublic of Korea

The flexible product shape of additive manufacturing(AM)is attractive,but the process suffers from a lack of material property diversity due to a limited number of printable alloys and post-processing *** overcome this problem,the AM of metal matrix composites(MMCs)is a highly suitable solution because the properties of MMC can be tailored using various ***,extensive research has been conducted on the AM of MMCs;however,the major huddle for this process has been the difficulties in preparing feedstock powder and operating the AM *** study introduces an easily synthesizable core-shell composite powder,which was fabricated by a recently developed process called the SMART *** core-shell powder has a novel morphology,consisting of a metal core and composite shell,distinguishing it from the powders used in conventional AM *** 625/TiCp composites were fabricated using the core-shell composite powder,with various fractions of TiCp up to 10 vol.%.Compared to additive-manufactured Inconel 625,the additive-manufactured MMCs showed enhanced strength with significantly fewer *** results of this study may accelerate the application of MMC fabricated by AM,which offers superior properties and reliability compared to casting and powder metallurgy due to the higher degree of dislocation density and reinforcement dispersion.

关键词： Powder treatment Composite powder Metal matrix composite Additive manufacturing Nickel-based superalloy Directed energy deposition

Emerging role of ^(18)F-fluorodeoxyglucose positron emission tomography for guiding management of hepatocellular carcinoma

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World Journal of Gastroenterology 2019年第11期25卷 1289-1306页

作者： Sang Mi lee hong soo Kim Sangheun lee Jeong Won lee Department of Nuclear Medicine Soonchunhyang University Cheonan Hospital Department of Internal Medicine Soonchunhyang University Cheonan Hospital Division of Hepatology Department of Internal medicineCatholic Kwandong University College of MedicineInternational St.Mary’s Hospital Institute for Health and Life Science Catholic Kwandong University College of MedicineInternational St.Mary’s Hospital Department of Nuclear Medicine Catholic Kwandong University College of MedicineInternational St.Mary’s Hospital

Hepatocellular carcinoma(HCC) is one of major causes of cancer mortality worldwide. For decades, ^(18)F-fluorodeoxyglucose(FDG) positron emission tomography(PET) has been widely used for staging, predicting prognosis, and detecting cancer recurrence in various types of malignant diseases. Due to low sensitivity of FDG PET for detecting intrahepatic HCC lesions, the clinical value of FDG PET in HCC patients has been limited. however, recent studies with diverse analytic methods have shown that FDG PET has promising role in aiding management of HCC patients. In this review, we will discuss the clinical role of FDG PET for staging, predicting prognosis, and evaluating treatment response in HCC. Further, we will focus on recent clinical studies regarding implication of volumetric FDG PET parameters, the significance of FDG uptake in HCC for selecting treatment and predicting treatment response, and the use of radiomics of FDG PET in HCC.

关键词： Hepatocellular carcinoma Fluorodeoxyglucose F18 Positron emission tomography Staging Prognosis