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Ultrafast synthesis of gold nanoparticles on cellulose nanocrystals via microwave irradiation and their dyes-degradation catalytic activity

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Journal of Materials Science & Technology 2020年第6期41卷 168-177页

作者： Madhusudhan Alle Seung-hwan lee Jin-Chul Kim Institute of Forest Science Kangwon National UniversityChuncheon 24341Republic of Korea Department of Forest Biomaterials Engineering Kangwon National UniversityChuncheon 24341Republic of Korea Department of Medical Biomaterials Engineering College of Biomedical Science and Institute of Bioscience and BiotechnologyKangwon National University192-1Hyoja 2 dongChuncheonKangwon-do 200-701Republic of Korea

This study represents a well-dispersed gold nanoparticles(AuNPs)synthesis process via cellulose nanocrystals(CNC)which acts as both reducing and supporting *** synthesis process was ultrafast and completed in a few seconds using microwave *** entire synthesis process was cost-effective,sustainable and *** synthesized(AuNPs/CNC)nanocomposite was investigated by transmission electron microscopy,selected area electron diffraction,Fourier transform infrared spectroscopy,energy dispersive X-ray analysis,X-ray diffraction,and UV–vis *** obtained AuNPs were well accumulated on the CNC surface and had a uniform spherical shape with an average diameter of 8±5.3 *** diameter of AuNPs could be altered by tuning the concentration of CNC *** synthesized AuNPs/CNC nanocomposite film exhibited excellent degradation properties against various organic dyes,namely,Allura red,Congo red,Rhodamine B and *** ultrafast degradation reactions followed pseudo first order *** the catalytic degradation reaction,AuNPs/CNC was transmitting electrons from a donor(NaBH4)to an acceptor(a dye).

关键词： Cellulose nanocrystals Gold nanoparticles Microwave synthesis Catalytic degradation of dyes

Safety of acupotomy in a real-world setting:A prospective pilot and feasibility study

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Journal of Integrative Medicine 2022年第6期20卷 514-523页

作者： Sang-Hoon Yoon Chan-Young Kwon hee-Geun Jo Jae-Uk Sul Hyangsook lee Jiyoon Won Su Jin Jeong Jun-hwan lee Jungtae leem Chung-Yeon Korean Medicine Clinic Gangnam-guSeoul 06224Republic of Korea Department of Oriental Neuropsychiatry Dong-eui University College of Korean MedicineBusanjin-guBusan 47340Republic of Korea Department of Herbal Pharmacology College of Korean MedicineGachon University1342 Seongnamdae-roSujeong-guSeongnam 13120Republic of Korea Department of Korean Rehabilitation Medicine Dongshin University Korean Medicine HospitalGwangju 61619Republic of Korea Acupuncture and Meridian Science Research Center Kyung Hee UniversityDongdaemun-guSeoul 02447Republic of Korea Department of Science in Korean Medicine Graduate SchoolKyung Hee UniversityDongdaemun-guSeoul 02447Republic of Korea KM Science Research Division Korea Institute of Oriental MedicineDaejeon 34054Republic of Korea Department of Statistics Support Medical Science Research InstituteKyung Hee University Medical CenterDongdaemun-guSeoul 02447Republic of Korea Clinical Medicine Division Korea Institute of Oriental MedicineYuseong-guDaejeon 34054Republic of Korea Korean Medicine Life Science University of Science&Technology(UST)Campus of Korea Institute of Oriental MedicineYuseong-guDaejeon 34054Republic of Korea College of Korean Medicine Wonkwang UniversityIksanJeollabuk-do54538Republic of Korea

Objective:Acupotomy is a modern acupuncture method that includes modern surgical *** acupotomy is relatively more invasive than filiform acupuncture treatment,it is important to establish the safety profile of this *** justify further large-scale prospective observational studies,this preliminary study was performed to assess the feasibility of the approach and investigate the safety profile and factors potentially associated with adverse events(AEs).Methods:This was a prospective pilot study that assessed the feasibility of a large-scale forthcoming safety study on acupotomy treatment in a real-world *** feasibility(call response rate,dropout rate,response rate for each variable and recruitment per month)and safety profile(incidence,type,severity and causality of AEs,and factors potentially associated with AEs)were ***:A total of 28 participants joined the study from January to May 2018.A follow-up assessment was achieved in 258(1185 treatment points)out of 261 sessions(1214 treatment points).The response rate via telephone on the day after treatment was 87.3%.There were 8 systemic AEs in all the sessions(8/258;3.11%)and 27 local AEs on the total points treated(27/1185;2.28%).Severe AEs did not *** AE and local AE occurrence were associated with blade width and the number of needle stimulations per treatment ***:The findings suggest that it could be feasible to analyze the safety of acupotomy in a realworld ***,the primary data on some relevant AEs could be *** are planning large-scale prospective studies based on these *** registration:Clinical Research Information Service(CRIS)KCT0002849(https://***/cris/search/***/11487).

关键词： Acupotomy Acupuncture Safety Adverse effects Observational study Traditional Chinese medicine

Bidirectional rotating direct-current triboelectric nanogenerator with self-adaptive mechanical switching for harvesting reciprocating motion

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International Journal of Extreme Manufacturing 2024年第4期6卷 324-335页

作者： Donghan lee Joonmin Chae Sumin Cho Jong Woo Kim Awais Ahmad Mohammad Rezaul Karim Moonwoo La Sung Jea Park Dongwhi Choi Department of Mechanical Engineering(Integrated Engineering Program) Kyung Hee University1732 Deogyeong-daeroYonginGyeonggi 17104Republic of Korea Department of Chemistry University of LahoreLahorePakistan Department of Mechanical Engineering College of EngineeringKing Saud UniversityRiyadh 11421Saudi Arabia School of Mechanical Engineering Korea University of Technology and Education1600 Chungjeol-roCheonanChungnam 31253Republic of Korea

Amid the growing interest in triboelectric nanogenerators(TENGs)as novel energy-harvesting devices,several studies have focused on direct current(DC)TENGs to generate a stable DC output for operating electronic ***,owing to the working mechanisms of conventional DC TENGs,generating a stable DC output from reciprocating motion remains a ***,we propose a bidirectional rotating DC TENG(BiR-TENG),which can generate DC outputs,regardless of the direction of rotation,from reciprocating *** distinct design of the BiR-TENG enables the mechanical rectification of the alternating current output into a rotational-direction-dependent DC ***,it allows the conversion of the rotational-direction-dependent DC output into a unidirectional DC output by adapting the configurations depending on the rotational *** to these tailored design strategies and subsequent optimizations,the BiR-TENG could generate an effective unidirectional DC *** of the BiR-TENG for the reciprocating motions of swinging doors and waves were demonstrated by harnessing this *** study demonstrates the potential of the BiR-TENG design strategy as an effective and versatile solution for energy harvesting from reciprocating motions,highlighting the suitability of DC outputs as an energy source for electronic devices.

关键词： direct-current triboelectric nanogenerator mechanical rectification self-adaptive mechanical design harvesting reciprocation motion

Detection of stacking orientation error of CFRP composite laminates using ultrasound waves

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中国有色金属学会会刊：英文版 2009年第B09期19卷 124-127页

作者： Sun-Kyu KIM David HSU Young-hwan SEO Kwang-hee IM Division of Mechanical System Engineering Chonbuk National University Center for Nondestructive Evaluation Iowa State University Department of Physical Education Chosun University Department of Automotive Engineering Woosuk University

A jig was developed for generating a shear wave. A pyramid with an isosceles triangle with two 45o was made of aluminum to generate shear waves using two longitudinal transducers based on ultrasonic-polarized mechanism. Also, the signal splitter was connected to the pulser jack on the pulser/receiver and to the longitudinal transducers. Therefore, an experimental way was performed in order to make shear wave on the bottom of aluminum alloyed pyramid. Also, a jig was manufactured and developed for generating a shear wave based on the computer numerical simulation. It is found that the experimentally shear wave variation of newly-designed jig is consistent with computer numerical simulation results and shear wave ultrasonic application can be very useful to detect the defects in CFRP composites.

关键词：碳纤维复合材料误差检测超声波复合材料层板计算机数值模拟堆垛脉冲发生器信号分配器

Difference in extrusion temperature dependences of microstructure and mechanical properties between extruded AZ61 and AZ91 alloys

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Journal of Magnesium and Alloys 2023年第5期11卷 1683-1696页

作者： Dong hee lee Gyo Myeong lee Sung Hyuk Park School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea

The effects of extrusion temperature on the microstructure and tensile properties of extruded AZ61 and AZ91 alloys are investigated by subjecting them to hot extrusion at 300 and 400℃.Although the average grain size of the extruded AZ61 alloy slightly increases from 9.5 to 12.6μm with increasing extrusion temperature,its resultant microstructural variation is *** contrast,the average grain size of the extruded AZ91 alloy significantly increases from 5.7 to 22.5μm with increasing extrusion temperature,and the type of Mg17Al12 precipitates formed in it changes from fine dynamic precipitates with a spherical shape to coarse static precipitates with a lamellar *** the extrusion temperature increases,the tensile yield strength of the extruded AZ61 alloy increases from 183 to 197 MPa while that of the extruded AZ91 alloy decreases from 232 to 224 *** tensile elongations of the extruded AZ61 and AZ91 alloys decrease with increasing extrusion temperature,but the degree of decrease is significant in the latter *** different extrusion temperature dependences of the tensile properties of the extruded AZ61 and AZ91 alloys are discussed in terms of their microstructural characteristics,strengthening mechanisms,and crack initiation sites.

关键词： Mg-Al-Zn alloys Extrusion temperature Precipitation Strengthening mechanism Tensile properties

Brain-derived neurotrophic factor mediates macrophage migration inhibitory factor to protect neurons against oxygen-glucose deprivation

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Neural Regeneration Research 2020年第8期15卷 1483-1489页

作者： Su hwan Bae Mi Ran Yoo Ye Yeong Kim In Kyung Hong Mi hee Kim Seung Hak lee Dae Yul Kim Department of Rehabilitation Medicine Asan Medical CenterUniversity of Ulsan College of MedicineSeoulRepublic of Korea Asan Institute for Life Sciences Asan Medical CenterUniversity of Ulsan College of MedicineSeoulRepublic of Korea

Macrophage migration inhibitory factor(MIF)is a chemokine that plays an essential role in immune system *** studies suggested that MIF protects neurons in ischemic ***,few studies are reported on the role of MIF in neurological recovery after ischemic *** purpose of this study is to identify the molecular mechanism of neuroprotection mediated by *** neuroblastoma cells were incubated in Dulbecco’s modified Eagle’s medium under oxygen-glucose deprivation(OGD)for 4 hours and then returned to normal aerobic environment for reperfusion(OGD/R).30 ng/mL MIF recombinant(30 ng/mL)or ISO-1(MIF antagonist;50μM)was administered to human neuroblastoma *** cell cultures were assigned to one of four groups:control,OGD/R,OGD/R with MIF,OGD/R with *** viability was analyzed using WST-1 *** levels of brain-derived neurotrophic factor(BDNF),microtubule-associated protein 2(MAP2),Caspase-3,Bcl2,and Bax were detected by western blot assay and immunocytochemistry in each group to measure apoptotic ***-1 assay results revealed that compared to the OGD/R group,cell survival rate was significantly higher in the OGD/R with MIF group and lower in the OGD/R with ISO-1 *** blot assay and immunocytochemistry results revealed that expression levels of BDNF,Bcl2,and MAP2 were significantly higher,and expression levels of Caspase-3 and Bax were significantly lower in the MIF group than in the OGD/R *** levels of BDNF,Bcl2,and MAP2 were significantly lower,and expression levels of Caspase-3 and Bax were significantly higher in the ISO-1 group than in the OGD/R *** administration promoted neuronal cell survival and induced high expression levels of BDNF,MAP2,and Bcl2(anti-apoptosis)and low expression levels of Caspase-3 and Bax(pro-apoptosis)in an OGD/R *** results suggest that MIF administration is effective for inducing expression of BDNF and leads to neuroprotection of neuronal cells

关键词： apoptosis brain-derived neurotrophic factor hypoxia in vitro ischemic stroke macrophage migration inhibitory factor nerve regeneration neuroprotective effect reperfusion

Application of an Artificial Neural Network for a Direct Estimation of Atmospheric Instability from a Next-Generation Imager

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Advances in Atmospheric Sciences 2016年第2期33卷 221-232页

作者： Su Jeong lee Myoung-hwan AHN Yeonjin lee Department of Atmospheric Science and Engineering Ewha Women’s University

Atmospheric instability information derived from satellites plays an important role in short-term weather forecasting, especially the forecasting of severe convective storms. For the next generation of weather satellites for Korea＇s multi-purpose geostationary satellite program, a new imaging instrument has been developed. Although this imaging instrument is not de- signed to perform full sounding missions and its capability is limited, its multi-spectral infrared channels provide information on vertical sounding. To take full advantage of the observation data from the much improved spatiotemporal resolution of the imager, the feasibility of an artificial neural network approach for the derivation of the atmospheric instability is investigated. The multi-layer perceptron model with a feed-forward and back-propagation training algorithm shows quite a sensitive re- sponse to the selection of the training dataset and model architecture. Through an extensive performance test with a carefully selected training dataset of 7197 independent profiles, the model architectures are selected to be 12, 5000, and 0.3 for the number of hidden nodes, number of epochs, and learning rate, respectively. The selected model gives a mean absolute error, RMSE, and correlation coefficient of 330 J kg-1, 420 J kg-1, and 0.9, respectively. The feasibility is further demonstrated via application of the model to real observation data from a similar instrument that has comparable observation channels with the planned imager.

关键词： CAPE artificial neural network instability geostationary imager

Superiority of split dose midazolam as conscious sedation for outpatient colonoscopy

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World Journal of Gastroenterology 2009年第30期15卷 3783-3787页

作者： Hyuk lee Jeong hwan Kim Department of Medicine Samsung Medical CenterSungkyunkwan University School of MedicineSeoulSouth Korea Department of Internal Medicine Armed Forces Capital HospitalSeongnam 135-710South Korea Department of Internal Medicine Konkuk University School of MedicineSeoul 143-729South Korea

AIM: To elucidate the efficacy and safety of a split dose of midazolam in combination with meperidine for colonoscopy. METHODS: Eighty subjects undergoing outpatient colonoscopy were randomly assigned to group A or B. Group A (n = 40) received a split dose of midazolam in combination with meperidine. Group B (n = 40) received a single dose of midazolam in combination with meperidine. Outcome measurements were level of sedation, duration of sedation and recovery, degree of pain and satisfaction, procedure-related memory, controllability, and adverse events. RESULTS: Group A had a lower frequency of significant hypoxemia (P = 0.043) and a higher sedation score on withdrawal of the endoscope from the descending colon than group B (P = 0.043). Group B recovered from sedation slightly sooner than group A (P < 0.002). Scores for pain and memory, except insertion-related memory, were lower in group A one week after colonoscopic examination (P = 0.018 and P < 0.030, respectively). Poor patient controllability was noted by the endoscopist and nurse in group B (P = 0.038 and P = 0.032, respectively). CONCLUSION: Split dose midazolam in combination with meperidine resulted in a safer, more equable sedation status during colonoscopic examination and a reduction in procedure-related pain and memory, but resulted in longer recovery time.

关键词： Amnesia Colonoscopy Conscious sedation Midazolam

Measurement of the time required for termites to pass each other in tunnels of different curvatures

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Insect Science 2013年第4期20卷 550-556页

作者： Seungwoo Sim Sang-hee lee Division of Fusion Convergence of Mathematical Sciences National Institute for Mathematical Sciences Daejeon South Korea

Subterranean termites construct complex tunnel networks for foraging. During travel in the tunnels, termites often encounter one another when passing in opposite directions. Such encounters are likely to affect the ＂movement efficiency,＂ which is the time required for a termite to travel a certain distance in a tunnel. In this study, we explored how individual-individual encounters affect movement efficiency in tunnels by measuring the time （v） taken by two termites to pass one another in tunnels of different curvatures. Artificial tunnels of 5 cm in length and variable widths （W） of 2, 3, or 4 mm were made. Tunnel distance （D） was 2, 3, 4, or 5 cm. When D had a higher value, curvature was lower. When W = 2, T was significantly shorter in the tunnel with D = 5 than in tunnels ofD = 2, 3, or 4, whereas v was statistically the same for D = 2, 3 and 4. When W = 3, r was shorter in the tunnel with D = 5 than for D = 3 and 4, while ~ was longer in the tunnel with D = 2 than for D = 3 and 4. When W = 4, r was longer in the tunnels with D = 2 and 3 than for D = 4 and 5. Based on these observations, 3 types of termite behavior were identified： biased walking, backward walking, and zigzag walking. We considered these results in relation to foraging efficiency.

关键词： individual-individual encounters movement efficiency termites tunnelcurvature turmel network