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Attaching single carbon nanotube on tip's apex using dielectrophoresis of DC-pulse voltage

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中国有色金属学会会刊：英文版 2009年第B9期19卷 280-283页

作者： Hee-Jin JEONG Yoong-Ho JUNG deug-woo lee Gyeongbuk Hybrid Technology Institute School of Mechanical Engineering Pusan National University Department of Nanosystem and Nanoprocess Engineering Pusan National University

Single carbon nanotubes (CNTs) are candidates for a number of electronics and sensing applications, provided that single CNTs can be separated from a bundle of CNTs in suspension. Dielectrophoresis has recently been demonstrated as one route for the extraction of desired CNTs. However, previous methods using dielectrophoresis have found it difficult to extract single nanotubes from bundles of CNTs in solution. Here, we show that this restriction can be overcome by using pulsed DC voltage of an electric field, instead of regular AC and DC voltages.

关键词：碳纳米管直流脉冲脉冲电压介电顶点消息电子号码 CNTs

Microstructure of fast tool servo machining on copper alloy

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中国有色金属学会会刊：英文版 2012年第S3期22卷 820-824页

作者： Hong LU Soo-chang CHOI Sang-min lee deug-woo lee Department of Nano Fusion Technology Pusan National University Korea Institute of Machinery & Materials Department of Nano Mechatronics Engineering Pusan National University

The development of the fast tool servo (FTS) for precision machining was *** micron machining performance of a piezoelectric-assisted FTS on copper alloy was *** results indicate that the quality of the microstructure depends mainly on two important factors:the cutting speed (or spindle speed) and the driving frequency of the *** excessive driving frequency increases the formation of *** effect of the clearance angle of the diamond tool on the microstructure machining precision was also investigated.

关键词： fast tool servo microstructure piezoelectric diamond machining copper alloy

Diamond machining of sinusoidal grid surface using fast tool servo system for fabrication of hydrophobic surface

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中国有色金属学会会刊：英文版 2012年第S3期22卷 787-792页

作者： Hong LU deug-woo lee Sang-Min lee Jeong-woo PARK Department of Nano Fusion Technology Pusan National University Department of Nano Mechatronics Engineering Pusan National University Department of Mechanical Design Engineering Chosun University

Ultra-precision diamond machining with piezoelectric-assisted fast tool servo (FTS) was used to produce various free-form surfaces.A low cost,rapid and large area fabrication of uniform hydrophobic surface at room temperature which transfers the FTS fabricated sinusoidal grid surface to the flat film with UV-moulding process was described.A piezoelectric-assisted FTS with high band width of 2 kHz,travel range up to 16 μm and the compact mechanism structure was designed for the sinusoidal grid surface machining and the dynamic performance testing of FTS was described in *** results indicate that the dimensions of sinusoidal grid change with the variation of the FTS machining *** properties of UV-moulded surface were evaluated,the best contact angle was measured to be 120.5° on the sinusoidal grid surface with profile wavelength of 350 μm and peak-to-valley amplitude of about 16 μm.

关键词： fast tool servo system diamond turning sinusoidal grid surface UV-moulding contact angle

In situ infrared, Raman and X-ray spectroscopy for the mechanistic understanding of hydrogen evolution reaction

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Journal of Energy Chemistry 2024年第3期90卷 632-651,I0014页

作者： Andi Haryanto Kyounghoon Jung Chan woo lee Dong-Wan Kim Department of Chemistry Kookmin UniversitySeoul 02707Republic of Korea School of Civil Environmental and Architectural EngineeringKorea UniversitySeoul 02841Republic of Korea

Hydrogen production by water reduction reactions has received considerable attention because hydrogen is considered a clean-energy carrier,key for a sustainable energy *** methods have been widely used to study the reaction mechanism of the hydrogen evolution reaction(HER),but the calculation results need to be supported by experimental results and direct evidence to confirm the mechanistic *** this review,we discuss the fundamental principles of the in situ spectroscopic strategy and a theoretical model for a mechanistic understanding of the *** addition,we investigate recent studies by in situ Fourier transform infrared(FTIR),Raman spectroscopy,and X-ray absorption spectroscopy(XAS) and cover new findings that occur at the catalyst-electrolyte interface during *** spectroscopic strategies provide practical ways to elucidate catalyst phase,reaction intermediate,catalyst-electrolyte interface,intermediate binding energy,metal valency state,and coordination environment during HER.

关键词： Hydrogen evolution reaction Infrared spectroscopy Raman spectroscopy X-ray absorption spectroscopy Reaction mechanism

Extracellular vesicles for neural regeneration after spinal cord injury

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Neural Regeneration Research 2024年第3期19卷 491-492页

作者： Young-Ju Lim wook-Tae Park Gun woo lee Department of Orthopedic Surgery Yeungnam University Medical CenterYeungnam University College of MedicineDaeguKorea

What is spinal cord injury:Spinal cord injury(SCI)is the damage to the structure of the bundles of cells and nerves that communicate signals from the brain to the body and *** pathology of SCI includes both primary and secondary injuries(Morales et al.,2016).Physical forces such as compression,shearing,contusion,and tearing are major causes of primary injury in *** are two main processes in primary injury:acute and *** acute phase includes traumatic disruption of axons and hemorrhage of the blood vessels around the spinal *** injury to the vessels can lead to increased edema within the neural and cord tissues,susceptibility to infiltration by microglia and astrocytes,excitotoxicity,and ***,disruption of the blood-spinal cord barrier results in the release of inflammatory cytokines from specific cells and vessels.

关键词： acute injuries nerves

Congestive ischemic colitis successfully treated with antiinflammatory therapy: A case report

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World Journal of Clinical Cases 2024年第1期12卷 142-147页

作者： Geon woo lee Su Bum Park Department of Internal Medicine Pusan National University School of Medicine and Research Institute for Convergence of Biomedical Science and TechnologyPusan National University Yangsan HospitalYangsan 50612South Korea

BACKGROUND Congestive ischemic colitis is a rare subtype of ischemic colitis with an unknown *** conservative management,such as fasting,no established treatment exists;therefore,surgical intervention should be considered in some cases if symptoms *** literature suggests that anti-inflam-matory agents may effectively treat congestive ischemic *** SUMMARY We present the case of a 68-year-old female patient who underwent laparoscopic left hemicolectomy for transverse colon cancer 3 years ***,follow-up included an annual colonoscopy and abdominal computed tomography(CT)at a local ***,progressive erythema and edema of the sigmoid colon were observed 1 year *** admission to our hospital,she complained of abdominal pain and *** CT showed thickening of the sigmoid colon walls,and colonoscopy revealed erythema,edema,and multiple ulcers with exudate in the sigmoid *** angiography showed engorgement of the sigmoid vasa recta without any vascular *** diagnosis was congestive ischemic colitis,and we treated the patient with anti-inflammatory *** 2 mo of glucocorticoid therapy(20 mg once daily)and 7 mo of 5-aminosalicylate therapy(1 g twice daily),the ulcers completely *** has not experienced any recurrence for 2 *** Anti-inflammatory therapy,specifically glucocorticoids and 5-aminosalicylate,has demonstrated promising efficacy and introduces potential novel treatment options for congestive ischemic colitis.

关键词： Ischemic colitis Glucocorticoids 5-aminosalicylate Colon cancer

Prenatal and postnatal factors associated with sudden infant death syndrome:an umbrella review of meta-analyses

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World Journal of Pediatrics 2024年第5期20卷 451-460页

作者： Tae Hyeon Kim Hyeri lee Selin woo Hayeon lee Jaeyu Park Guillaume Fond Laurent Boyer Jong woo Hahn Jiseung Kang Dong Keon Yon Department of Medicine Kyung Hee University College of MedicineSeoulSouth Korea Center for Digital Health Medical Science Research InstituteKyung Hee University College of MedicineSeoulSouth Korea Department of Regulatory Science Kyung Hee UniversitySeoulSouth Korea Department of Biomedical Engineering Kyung Hee UniversityYonginSouth Korea CEReSS-Health Service Research and Quality of Life Center Assistance Publique des Hôpitaux de MarseilleAix-Marseille UniversityMarseilleFrance Department of Pediatrics Seoul National University College of MedicineSeoulSouth Korea Department of Pediatrics Seoul National University Bundang HospitalSeongnamSouth Korea Department of Anesthesia Critical Care and Pain MedicineMassachusetts General Hospital14913th StreetRoom 4140CharlestownBostonMAUSA Division of Sleep Medicine Harvard Medical SchoolBostonMAUSA Department of Pediatrics Kyung Hee University Medical CenterKyung Hee University College of Medicine23 Kyungheedae-roDongdaemun-guSeoul02447South Korea Department of Precision Medicine Kyung Hee University College of MedicineSeoulSouth Korea

Background Comprehensive quantitative evidence on the risk and protective factors for sudden infant death syndrome(SIDS)effects is *** investigated the risk and protective factors related to *** We conducted an umbrella review of meta-analyses of observational and interventional studies assessing SIDS-related ***/MEDLINE,Embase,EBSCO,and Google Scholar were searched from inception until January 18,*** extraction,quality assessment,and certainty of evidence were assessed by using A Measurement Tool Assessment Systematic Reviews 2 following PRISMA *** to observational evidence,credibility was graded and classified by class and quality of evidence(CE;convincing,highly suggestive,suggestive,weak,or not significant).Our study protocol was registered with PROSPERO(CRD42023458696).The risk and protective factors related to SIDS are presented as equivalent odds ratios(eORs).Results We identified eight original meta-analyses,including 152 original articles,covering 12 unique risk and protective factors for SIDS across 21 countries/regions and five *** risk factors,including prenatal drug exposure[eOR=7.84(95%CI=4.81–12.79),CE=highly suggestive],prenatal opioid exposure[9.55(95%CI=4.87–18.72),CE=suggestive],prenatal methadone exposure[9.52(95%CI=3.34–27.10),CE=weak],prenatal cocaine exposure[4.38(95%CI=1.95–9.86),CE=weak],prenatal maternal smoking[2.25(95%CI=1.95–2.60),CE=highly suggestive],postnatal maternal smoking[1.97(95%CI=1.75–2.22),CE=weak],bed sharing[2.89(95%CI=1.81–4.60),CE=weak],and infants found with heads covered by bedclothes after last sleep[11.01(95%CI=5.40–22.45),CE=suggestive],were *** the other hand,three protective factors,namely,breastfeeding[0.57(95%CI=0.39–0.83),CE=non-significant],supine sleeping position[0.48(95%CI=0.37–0.63),CE=suggestive],and pacifier use[0.44(95%CI=0.30–0.65),CE=weak],were also *** Based on the evidence,we propose several risk and protecti

关键词： Infant Protective factor Risk factor Sudden infant death syndrome Umbrella review

A crucial role of neutrophil extracellular traps in pulmonary infectious diseases

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Chinese Medical Journal Pulmonary and Critical Care Medicine 2024年第1期2卷 34-41页

作者： Ting Pan Jae woo lee Shanghai Key Laboratory of Lung Inflammation and Injury Department of Pulmonary MedicineZhongshan HospitalFudan UniversityShanghai 200032China Department of Anesthesiology University of California Los AngelesLos AngelesCA 90230USA

Neutrophil extracellular traps(NETs),extrusions of intracellular DNA with attached granular material that exert an antibacterial effect through entangling,isolating,and immobilizing microorganisms,have been extensively studied in recent *** primary role of NETs is to entrap and facilitate the killing of bacteria,fungi,viruses,and parasites,preventing bacterial and fungal *** formation has been described in many pulmonary diseases,including both infectious and *** are considered a double-edged *** innate immune cells,neutrophils release NETs to kill pathogens and remove cellular ***,the dele-terious effects of excessive NET release in lung disease are particularly important because NETs and by-products of NETosis can directly induce epithelial and endothelial cell death while simultaneously inducing inflammatory cytokine secretion and immune-mediated ***,NET formation must be tightly regulated to preserve the anti-microbial capability of NETs while minimizing damage to the *** this review,we summarized the recent updates on the mechanism of NETs formation and pathophysiology associated with excessive NETs,aiming to provide insights for research and treatment of pulmonary infectious diseases.

关键词： Pulmonary infectious diseases Neutrophils Neutrophil extracellular traps(NETs) NETosis

Factor analysis of recent major heatwaves in East Asia

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Geoscience Frontiers 2024年第1期15卷 374-383页

作者： Arim Yoon Jeongwon Kim Jooyeop lee Hyun Min Sung Je-woo Hong Seung-Ki Min Junhong lee Jinkyu Hong Ecosystem-Atmosphere Process Laboratory Department of Atmospheric SciencesYonsei UniversitySeoul 03722Republic of Korea National Institute of Meteorological Sciences Jeju 63568Republic of Korea Korea Adaptation Center for Climate Korea Environment InstituteSejong 30121Republic of Korea Division of Environmental Science and Engineering Pohang University of Science and TechnologyPohang 37673Republic of Korea Max Planck Institute for Meteorology Hamburg 20146Germany Institute for Convergence Research and Education in Advanced Technology Yonsei UniversitySeoulRepublic of Korea

Heatwaves(HWs)present a major hazard to our society and more extreme heatwaves are expected with future climatic ***,it is important to improve our understanding of the underlying processes that drive HWs,in order to boost our socioeconomic-ecological *** this study,we quantified the influences of key driving factors(large-scale atmospheric circulation,soil moisture,and sea surface temperature)and their synergies on recent heatwaves in East *** conducted a factor separation analysis for three recent HW events by constraining the key factors in the regional Weather Research and Forecasting model with their climatologies or pseudo-observations in different *** study showed distinct spatial variations in the HW-controlling factors in East *** synergistic interaction of large-scale circulation and soil moisture was the most important factors in the 2013 Chinese *** the 2018 HWs in Korea and Japan,the same stagnant large-scale atmospheric circulation played a dominant role in driving the HW *** land-atmosphere coupling via soil moisture,its interaction with circulation,and SST exhibited stronger influences during the Korean HW than the Japanese *** analysis also revealed temporal variations in the factors driving Korean and Chinese HWs due to typhoon passage and other multiple processes over heterogeneous surfaces(i.e.,topographically induced Foehn winds,large-scale warm advection from the warm ocean,spatial differences in soil moisture).Our findings suggest that future heatwave-related studies should consider interactive contributions of key factors,their interplay with surface heterogeneities of complex terrain.

关键词： Heatwave East Asia Large-scale circulation Soil moisture Sea surface temperature Synergistic impacts