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국내 경영혁신 활동의 핵심 성공요인 문헌 연구 - 6시그마^ TQM^ 린 6시그마^ ERP^ TPM^ BPR^ Project Management^ System Engineering 중심으로 -
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초등학교 방과 후 원예활동이 아동의 정서지능에 미치는 영향
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Theoretical and structure studies of lithium cyclic amide conformations. Monomers and aggregates
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Le syndrome d'Ehlers-Danlos. Qu'y a-t-il sous la pointe emergee de l'iceberg ?
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농산물 전자상거래 마케팅 전략 개발에 관한 연구 = (A) Study on the developing of agricultural EC marketing strategy
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- 저자 : Yiting Xie (검색결과 3 건)
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Yiting Xu,Jianjie Xie,Lingnan Chen,Conghui Yuan,Yinyin Pan,Ling Cheng,Weiang Luo,Birong Zeng,Lizong Dai 한국고분자학회 2013 Macromolecular Research Vol.21 No.12
A novel organic/inorganic hybrid amphiphilic random copolymer poly(methacrylate isobutyl POSS-co-N-isopropylacrylamide-co-oligo(ethylene glycol) methyl ether methacrylate-co-2-vinylpyridine), poly(MAPOSS-co-NIPAM-co-OEGMA-co-2VP), was synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization. The self-assembly behavior of random copolymers in aqueous solution was investigated by dynamic light scattering (DLS) as well as transmission electron microscopy (TEM). The results indicate the novel random copolymer in water could self-assemble into spherical aggregates and the self-aggregate size displays a remarkable dependence on pH. The stimuli-responsive characteristics of these assembles were tested by means of UV-vis spectra,DLS and TEM. There is a critic Zn2+ concentration over which the aggregates can be coordinated into well-define spherical aggregate clusters. The critic Zn2+ concentration can be tuned finely through adjusting solution concentration or 2VP amount. Results from UV-vis and DLS reveal that the copolymer solutions exhibit a sharp and intensive lower critical solution temperature (LCST). Some factors such as the solution concentration, molecular weight, pH and copolymer generation, which could affect the cloud point, were studied systematically. The essentially predetermined LCST can be achieved by altering the content of 2VP or pH. In addition, these novel hybrid aggregates can undergo an association/disassociation cycle with the heating and cooling of solution and the degree of reversibility shows a strong concentration dependence. As a novel organic-inorganic hybrid material which can respond to multiple external stimuli including temperature, pH, metal ions with sharp stimuli-responsive behaviors, it is potentially used for biomedicine, catalysis, diagnostics, bioseparations, biosensors and for fundamental investigation.
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Interpenetration Enhancing of Chitosan-PEGLM Double Network (DN) Hydrogel and Its Properties
Yiting Xu,Jianjie Xie,Hui Gao,Ying Cao,Min Chen,Yanling Liu,Birong Zeng,Feng-Chih Chang,Lizong Dai 한국고분자학회 2015 Macromolecular Research Vol.23 No.1
A series of polylactic acid-polyethylene glycol-polylactic acid diacrylate macromers (PEGLM) were synthesized,and a novel chitosan-PEGLM double network (DN) hydrogel was further successfully fabricated by thesequential interpenetrating technology with highly cross-linked chitosan as the rigid component and PEGLM as theflexible component. Their structures and components were characterized by 1H NMR, FTIR, and XRD. Their fracturemorphology was investigated by SEM. It was interesting to found that the compressive strength of hydrogel woundreach its maximum value when the chitosan content was 10%, no matter what the molecular weight of PEGLM componentwas. What’s more, we found that the compressive strength of 6KL7 could reach 1.07 MPa at gel state, whosePEG segment molecular weight was 6,000, and polymerization degree of PLA was 7. The effects of glutaraldehyderatio, polymerization degree of PLA, and molecular weight of PEG segment on the mechanical strength of DNhydrogels were also discussed in this article. To further strengthen DN hydrogels, the double network-linear (DNL)hydrogels were fabricated by introducing linear poly(vinyl alcohol) (PVA) into the DN hydrogels. The DN-Lhydrogels exhibited better mechanical properties, with the compressive strength up to 1.45 MPa. These hydrogelsmay have prospective applications in the fields of wound dressing, artificial cartilage and tissue engineering scaffoldmaterials which require high mechanical properties.
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A Novel Experimental Measurement Method of Transformer Parasitic Capacitances
Naizeng Wang,Xu Yang,Angyang Zhou,Yiting Xie 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
As the increase of switching frequency and the extensive use of planar transformers, the capacitive effects of transformers can’t be neglected anymore. Firstly, several transformer parasitic capacitance models are introduced in this paper. Next, this paper proposes a novel experimental method, charge balance method, to measure transformer parasitic capacitances. This method is applicable to single lumped parasitic capacitance model. Finally, the step response method is performed to verify the charge balance method. Experimental results show that the charge balance method is of high accuracy.
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