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In situ synthesis of chemically bonded NaTi2（PO4）3/rGO 2D nanocomposite for high-rate sodium-ion batteries

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Nano Research 2016年第6期9卷 1844-1855页

作者： Ha-kyung Roh Hyun-kyung kim Myeong-Seong kim Dong-Hyun kim kyung Yoon Chung Kwang Chul Roh Kwang-Bum kim Department of Material Science & Engineering Yonsei University 50 Yonsei-ro Seodaemun-gu Seou103722 Republic of Korea Department of Materials Science and Metallurgy University of Cambridge 27 Charles Babbage Road Cambridge CB30FS UK Center for Energy Convergence Korea Institute of Science and Technology 5 Hwarang-ro 14-gil Seongbuk-gu Seou102792 Republic of Korea Energy & Environmental Division Korea Institute of Ceramic Engineering & Technology 101 Soho-ro Jinju-si Gyeongsangnam-do 52851 Republic of Korea

A phase-pure NaTi2（PO4）3/reduced graphene oxide （rGO） nanocomposite was prepared using a microwave-assisted one-pot method and subsequent heat treatment. The well-crystallized NaTi2（PO4）3 nanoparticles （30-40 nm） were uniformly precipitated on rGO templates through Ti-O-C bonds. The chemical interactions between the NaTi2（PO4）3 nanoparticles and rGO could immobilize the NaTi2（PO4）3 nanoparticles on the rGO sheets, which might be responsible for the excellent electrochemical performance of the nanocomposite. The NaTi2（PO4）B/rGO nanocomposite exhibited a specific capacity of 128.6 mA-h.g-1 approaching the theoretical value at a 0.1 C-rate with an excellent rate capability （72.9% capacity retention at 50 C-rate） and cycling performance （only 4.5% capacity loss after 1,000 cycles at a high rate of 10 C）. These properties were maintained even when the electrodes were prepared without the use of an additional conducting agent. The excellent sodium storage properties of the NaTi2（PO4）B/rGO nanocomposite could be attributed to the nano-sized NaTi2（PO4）3 particles, which significantly reduced the transport lengths for Na＋ ions, and an intimate contact between the NaTi2（PO4）3 particles and rGO due to chemical bonding.

关键词： NaTi2(PO4)dreducedgraphene oxide (rGO)nanocomposite chemical bonding energy-efficiency in situ synthesis high-rate sodium-ion batteries

Role of ERK/MAPK signalling pathway in anti-inflammatory effects of Ecklonia cava in activated human mast cell line-1 cells

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Asian Pacific Journal of Tropical Medicine 2014年第9期7卷 703-708页

作者： Hye kyung kim Department of Food and Biotechnology Hanseo UniversitySeosan 356-706Republic of Korea

Objective:The anti-inflammatory effects of Ecklonia cava(EC)and its mechanism of action were examined in phorbol-12 myristate 13-acetate(30 nmol/L)and A23187(1μmol/L)(PMACI)stimulated human mast cell line-1 ***:Nitric oxide content,inducible nitric oxide synthase and cyclooxygenase-2 protein expression,pro-inflammatory cytokines including IL-1β,TNF-α,and IL-6 mRNA and protein expressions were *** addition,extracellular regulated protein kinases/mitogen-activated protein kinase(ERK/MAPK)activation was ***:EC dose-dependently suppressed inducible nitric oxide synthase and cyclooxygenase-2 protein expression and subsequently it reduces nitric oxide content in PMACI stimulated human mast cell line-1 *** dose-dependently inhibited the mRNA as well as protein expression of TNF-α,IL—1β,and TL-6 in the PMACI stimulated human mast cell line-1 cells without any cytotoxic ***,EC significantly inhibited PMACI induced phosphorylation of ERK1/2 in a dose-dependent manner without affecting the total protein ***:EC exert its anti-inflammatory actions via inhibition of ERK/MAPK signalling pathway,suggesting that EC is a potent and efficacious anti-inflammatory agent for mast cellmediated inflammatory diseases.

关键词： Ecklonia cava Pro-inflammatory cytokine Inducible nitric oxide synthase Cyclooxygenase-2 Mitogen-activated protein kinase

Grain size dependence of flow stress in ECAPed Ti with constant texture

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中国有色金属学会会刊：英文版 2012年第S3期22卷 673-677页

作者： Chang-Young HYUN Ho-kyung kim Department of Materials Science and Engineering Seoul National University of Science and Technology Department of Automotive Engineering Seoul National University of Science and Technology

The effect of grain size on the flow stress in an ECAPed Ti with a constant texture was investigated,assuming that 2,4,5 and 6 passes microstructures have a similar *** average size of recrystallized grains decreased to 0.5 μm,0.4 μm,and 0.3 μm with respect to the ECAP pass number of 2,4,and 6,*** ultimate tensile strength (UTS) and yield strength (YS) increase with an increase in the number of *** UTS and YS of the 6 passes ECAPed sample were found to be 740.2 MPa and 580.3 MPa,*** equation for the flow stress of an ECAPed Ti with a constant texture as a function of the strain and grain size was derived for the ECAPed *** following equation was finally obtained:σ(ε)=103.9+1825ε-9.6ε1/2·d-1/2+8.3d-1/2.

关键词： Ti mechanical properties grain size flow stress equal channel angular pressing

A review on technologies with electricity generation potentials using liquified natural gas regasification cold energy

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Frontiers in Energy 2023年第3期17卷 332-379页

作者： Muhammad Tauseef NASIR Mirae kim Jaehwa LEE Seungho kim kyung Chun kim School of Mechanical Engineering Eco-friendly Smart Ship Parts Technology Innovation CenterPusan National UniversityBusan 46241South Korea School of Mechanical Engineering Pusan National UniversityBusan 46241South Korea Korea Gas Corporation Daegu 41062South Korea

In modern times,worldwide requirements to curb greenhouse gas emissions,and increment in energy demand due to the progress of humanity,have become a serious *** such scenarios,the effective and efficient utilization of the liquified natural gas(LNG)regasification cold energy(RCE),in the economically and environmentally viable methods,could present a great opportunity in tackling the core issues related to global warming across the *** this paper,the technologies that are widely used to harness the LNG RCE for electrical power have been *** systems incorporating,the Rankine cycles,Stirling engines,Kalina cycles,Brayton cycles,Allam cycles,and fuel cells have been ***,the economic and environmental studies apart from the thermal studies have also been ***,the discussion regarding the systems with respect to the regassification pressure of the LNG has also been *** aim of this paper is to provide guidelines for the prospective researchers and policy makers in their decision making.

关键词： liquified natural gas cold energy power generation

PopFlow:a novel flow management scheme for SDN switch of multiple flow tables based on flow popularity

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Frontiers of Computer Science 2020年第6期14卷 111-122页

作者： Cheng WANG kyung Tae kim Hee Yong YOUN College of Electrical and Computer Engineering Sungkyunkwan UniversitySuwon 16419Korea College of Software Sungkyunkwan UniversitySuwon 16419Korea

Pipeline processing is applied to mutiple flow tables(MFT)in the switch of software-defined network(SDN)to increase the throughput of the ***,the processing time of each flow increases as the size or number of flow tables gets *** this paper we propose a novel approach called PopFlow where a table keeping popular flow entries is located up front in the pipeline,and an express path is provided for the flow matching the table.A Markov model is employed for the selection of popular entries considering the match latency and match frequency,and Queuing theory is used to model the flow processing time of the existing MFT-based schemes and the proposed *** simulation reveals that the proposed scheme substantially reduces the flow processing time compared to the existing schemes,and the diference gets more significant as the flow arrival rate increases.

关键词： edge computing SDN pipeline processing PopFlow match frequency and latency markov model-based prediction

Water hammer in the pump-rising pipeline system with an air chamber

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Journal of Hydrodynamics 2014年第6期26卷 960-964页

作者： kim Sang-Gyun LEE Kye-Bock kim kyung-Yup Korea Water Resources Corporation School of Mechanical Engineering Chungbuk National University School of Mechanical Engineering Korea Polytechnic University

Water hammer following the tripping of pumps can lead to overpressure and negative pressure. Reduction in overpressure and negative pressure may be necessary to avoid failure, to improve the efficiency of operation and to avoid fatigue of system components. The field tests on the water hammer have been conducted on the pump rising pipeline system with an air chamber. The hydraulic transient was simulated using the method of characteristics. Minimizing the least squares problem representing the difference between the measured and predicted transient response in the system performs the calibration of the simulation program. Among the input variables used in the water hammer analysis, the polytropic exponent, the discharge coefficient and the wave speed were calibrated. The computer program developed in this study will be useful in designing the optimum parameters of an air chamber for the real pump pipeline system. The correct selection of air chamber size and the effect of the inner diameter of the orifice to minimize water hammer have been investigated by both field measurements and numerical modeling.

关键词： air chamber design parameter field test pump pipeline system water hammer

The Role of Relative Spinal Motion during Feline Galloping for Speed Performance

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Journal of Bionic Engineering 2014年第4期11卷 517-528页

作者： Young Kook kim Jongwon Park Byungho Yoon kyung-Soo kim Soohyun kim Robotics Program Korea Advanced Institute of Science and Technology (KAIST) Daejeon 305-701 Republic of Korea Department of Mechanical Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon 305-701 Republic of Korea

Felines use their spinal column to increase their running speed at rapid locomotion performance. However, its motion profile behavior during fast gait locomotion has little attention. The goal of this study is to examine the relative spinal motion profile during two different galloping gait speeds. To understand this dynamic behavior trend, a dynamic motion of the feline animal （Felis catus domestica） was measured and analyzed by motion capture devices. Based on the experiments at two different galloping gaits, we observed a significant increase in speed （from 3.2 m.s-1 to 4.33 m.s-1） during the relative motion profile synchronization between the spinal （range： 118.86~ to 168.00~） and pelvic segments （range： 46.35~ to 91.13~） during the hindlimb stance phase （time interval： 0.495 s to 0.600 s）. Based on this discovery, the relative angular speed profile was applied to understand the possibility that the role of the relative motion match during high speed locomotion generates bigger ground reaction force.

关键词： feline galloping galloping gait pattern relative spinal motion speed performance phase match

Insulinotrophic and hypolipidemic effects of Ecklonia cava in streptozotocin-induced diabetic mice

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Asian Pacific Journal of Tropical Medicine 2012年第5期5卷 374-379页

作者： Mi-Ja kim Hye kyung kim Department of Food and Biotechnology Hanseo UniversitySeosan 356-706Republic of Korea Department of Pharmacology school of MedicineKyunghee UniversitySeoul 130-701Republic of Korea

Objective:To explore the anti-diabetic activity of Ecklonia cava(EC) in streptozotocin(STZ)-induced diabetic ***:Diabetes was induced by a single intraperitoneal injection of STZ(90 mg/kg).Normal and diabetic mice were treated with 0%,3%,and 5%EC diet for 4 weeks. Serum glucose and insulin concentrations,serum lipid profile,oral glucose tolerance test,and liver and pancreaticβ-cell histopathological observations were *** addition,in vitro glucose-induced insulin secretion was determined using pancreaticβ-islet ***:EC supplementation significantly and dose-dependently decreased serum glucose concentration, and improved glucose homeostasis in diabetic mice by preventing loss ofβ-cell mass resulting in increase of insulin *** triglyceride and total cholesterol concentrations in the serum and liver were markedly reduced by EC treatment in STZ-diabetic ***,LDL-,and HDL-cholesterol levels were ameliorated in EC supplemented diabetic *** steatosis induced by STZ was ameliorated by EC ***,in vitro insulinotrophic effect of EC extract was observed in pancreaticβ-***:This study demonstrated that EC is a potent and efficacious hypoglycemic and hypolipidemic agent,and prevents the loss ofβ-cell mass resulting in increase of insulin secretary capacity.

关键词： Diabetes Streptozotocin Insulin Lipid profile Pancreaticβ-cell

Morphology Control of Bi2S3 Nanostructures and the Formation Mechanism

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Chinese Journal of Chemistry 2013年第6期31卷 752-756页

作者： HeeJin kim Ji-eun Park kyung kim Mi-kyung Han Sung-Jin kim Wooyoung Lee Department of Materials Science and Engineering Yonsei University Seou1120- 749 Korea Department of Chemistry and Nano Science Ewha Womans University Seoul 120-750 Korea

Bismuthinite （Bi2S3）nanostructures were prepared by a hydrothermal method with sodium ethylenediamine- tetraacetate （EDTA-Na2）. The morphology of Bi2S3 nanostructures was changed from a nanorod to a nanoplate by presence of the EDTA-Na2. The altered morphology was caused by the capping effect of EDTA-Na2 with Bi3＋ ions, which induces the suboptimal growth direction due to partially blocking the preferential orientation direction. When the EDTA-Na2/Bi3＋ molar ratio= 1, the growth of Bi2S3 nanostructures was not allowed due to the chelating effect of EDTA-Na2. The obtained Bi2S3 nanorods, stacked nanorods, nanoplates and nanoparticles were characterized using X-ray diffraction （XRD）, transmission electron microscopy （TEM）, high-resolution transmission electron mi- croscopy （HRTEM） and selected area electron diffraction （SAED） pattern. A possible formation mechanism of these morphologies was proposed. The successful synthesis of various morphologies of nanostructured Bi2S3 may open up new possibilities for thermoelectric, electronic and optoelectronic uses of nanodevices based on Bi2S3 nanostructure.

关键词： bismuth sulfide (Bi2S3) hydrothermal nanorod nanoplate thermoelectric material