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IPA 모형을 활용한 중국 농산품 전자상거래의 서비스품질 인식에 관한 실증적 연구
왕효봉 ( Xiaofeng¸ Wang ),백승우 ( Back Seung-woo ) 한국식품유통학회 2021 한국식품유통학회 학술대회 Vol.- No.하계
In this paper, through a questionnaire survey and analysis of the service quality satisfaction of Chinese consumers when using the agricultural product e-commerce platform, 560 questionnaires were distributed, and 534 valid questionnaires were received. First, the information on the importance and satisfaction of the original data was passed. The results of the analysis of degree and validity indicate that the questionnaire is reasonable in design and suitable for further analysis. Secondly, using correspondence analysis t-test to analyze the difference between the two sets of data, it is concluded that consumers' overall satisfaction with the agricultural product e-commerce platform is low. At the same time, the Z-score standard value method is used to analyze the data, although the result is the same as the original value. , But the Z-score standard value method more quickly and accurately distinguishes which quadrant each variable falls in. In order to further test the conclusions, finally, through the IPA analysis method, the current situation of consumers' perception of the services provided by the agricultural product e-commerce platform is studied, and the true attitude of consumers to the service quality of the agricultural product e-commerce platform is visually demonstrated.
Effects of solvent extraction on the microstructure of bituminous coal-based graphite
Wang Lipeng,Yao Zongxu,Guo Zhimin,Shen Xiaofeng,Li Zhiang,Zhou Zhengqi,Wang Yuling,Yang Jian-Guo 한국탄소학회 2022 Carbon Letters Vol.32 No.3
Coal-based graphite has become the main material of emerging industries. The microstructure of coal-based graphite plays an important role in its applications in many fields. In this paper, the effect of carbon disulfide/N-methyl-2-pyrrolidone solvent mixture extraction on the microstructure of bituminous coal-based graphite was systematically studied through preliminary extraction coupled with high-temperature graphitization. The graphitization degree g (75.65%) of the coal residue-based graphite was significantly higher than that of the raw coal-based graphite. The crystallite size La of the coal residue-based graphite was reduced by 47.06% compared with the raw coal-based graphite. The ID/ IG value of the coal residue-based graphite is smaller than that of the raw coal-based graphite. The specific surface area (16.72 m2/g) and total pore volume (0.0567 m3/g) of the coal residue-based graphite are increased in varying degrees compared with the raw coal-based graphite. This study found a carbon source that can be used to prepare coal-based graphite with high graphitization degree. The results are expected to provide a theoretical basis for further clean and efficient utilization of the coal residue resources.
( Wang Qiang ),( Shu Yuquan ),( Dong Minhua ),( Xu Ji ),( Tao Xiaofeng ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.5
Instantaneous relay (relay-without-delay) using interference alignment is a promising approach to neutralizing interference and improving system capacity. In Wang Chenwei`s work, a 2-user scenario required both source and relay to access the global channel state information (CSI). This paper shows a new method of interference alignment improves the degrees of freedom (DoF) prominently for the 3-user MIMO interference channel with instantaneous relay. This new method is focused on the relay node that completes the alignment interference neutralization so the global CSI is obtained only once and the pressure on the base station can be mitigated. In addition, the 3-user MIMO interference channels with instantaneous relay can achieve 2M DoF when source and destination have M antennas, respectively. This method shows 33% improvement over the conventional method using interference alignment which obtains 3M/2 DoF.
Transparent arrays of silver nanowire rings driven by evaporation of sessile droplets
Wang, Xiaofeng,Kang, Giho,Seong, Baekhoon,Chae, Illkyeong,Yudistira, Hadi Teguh,Lee, Hyungdong,Kim, Hyunggun,Byun, Doyoung Institute of Physics Publishing Ltd. 2017 Journal of Physics. D, Applied Physics Vol.50 No.45
<P>A coffee-ring pattern can be yielded on the three-phase contact line following evaporation of sessile droplets with suspended insoluble solutes, such as particles, DNA molecules, and mammalian cells. The formation of such coffee-ring, together with their suppression has been applied in printing and coating technologies. We present here an experimental study on the assembly of silver nanowires inside an evaporating droplet of a colloidal suspension. The effects of nanowire length and concentration on coffee-ring formation of the colloidal suspension were investigated. Several sizes of NWs with an aspect ratio between 50 and 1000 were systematically investigated to fabricate coffee-ring patterns. Larger droplets containing shorter nanowires formed clearer ring deposits after evaporation. An order-to-disorder transition of the nanowires’ alignment was found inside the rings. A printing technique with the evaporation process enabled fabrication of arrays of silver nanowire rings. We could manipulate the patterns silver nanowire rings, which might be applied to the transparent and flexible electrode.</P>
Xiaofeng Guo,Hongbo Wang,Liying Wang,Defen Zeng,Qian Xiang,Ba Chai 대한화학회 2019 Bulletin of the Korean Chemical Society Vol.40 No.3
Synthesizing composites is one of the most effective ways to reduce the recombination probability of electron?hole pairs and to improve photocatalytic activity. In this study, our research group first combined reduced graphene oxide (rGO) with porous graphitic carbon nitride (pg-C3N4) to form pg-C3N4@rGO core-shell, and then loaded bismuth tungstate (Bi2WO6) onto the pg-C3N4@rGO to acquire a ternary composite catalyst. The results of the experiment show that, the ternary photocatalyst exhibited better phototalytic performance than pure pg-C3N4 and Bi2WO6. When the weight radio of pg-C3N4@rGO and Bi2WO6 was 100:8, the ternary photocatalyst showed the best photocatalytic performance. Its photocatalytic kinetic constant reached 68 ? 10?4 min?1, which was 13.6 times that of pg-C3N4 and 7.6 times that of Bi2WO6. The photocatalytic performance was boosted by the heterojunction structure of the ternary composite, which can effectively separate electron?hole pairs rapidly, and thereby increased quantum yield, thus improving the photocatalytic performance.
Wang Yan,Wang Jin,Zhang Xue,Li Nan,Wang Junxia,Liang Xiaofeng 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.7
Series of unequal quantity Nd/Ce co-doped ceramic nuclear waste forms, (Gd, Nd)2(Zr, Ce)2O7, were prepared to tailor its ordered pyrochlore or disordered fluorite structure. The phase transition, microtopography, and elemental composition of the ceramic samples were systematically investigated, especially the effect of order-disorder structure on the chemical stability. It was confirmed that unequal quantity of Nd/Ce could synchronously replace the Gd/Zr-sites of Gd2Zr2O7. And the phase transition of order-disorder structure could be successfully tailored by regulating the average cationic radius ratio of (Gd, Nd)2(Zr, Ce)2O7 series. The elements of Gd, Nd, Zr, and Ce are uniformly distributed in the ordered or disordered structures. The MCC-1 leaching results showed that (Gd, Nd)2(Zr, Ce)2O7 pyrochlore ceramic nuclear waste forms had excellent chemical stability, whose elements' normalized leaching rates were as low as 104 -107 g‧m2 ‧d1 after 7 days. In particular, the chemical stability of disordered structure was superior to that of ordered structure. It was proposed that the force constant and the closest packing were changed with the structure transformation resulting the chemical stability difference
Controlled synthesis and characterization of BiVO4 dendrites via a hydrothermal method
Yonggang Wang,Linlin Yang,Xiaofeng Wang,Yujiang Wang,GAORONG HAN 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.7
BiVO4 dendrites have been controllably synthesized by a hydrothermal method without any surfactants or templates. Thestructure and morphology of the obtained BiVO4 dendrites were characterized by X-ray powder diffraction, scanning electronmicroscope, transmission electron microscopy, and high-resolution transmission electron microscopy. The effect of the pHvalues, precursors, solution concentrations, reaction temperature, and reaction time on the morphology and structure of theBiVO4 dendrites was systematically studied for the first time. It is found that the morphologies of the obtained BiVO4crystallites can vary from cubic-like to dendritic shape. The BiVO4 dendrites can be successfully fabricated by thehydrothermal method at 150 oC and pH 7 when Bi2(CO3)3 and NH4VO3 were used as precursors The resultant dendriticstructure has four trunks which have ordered branches on the opposite sides of the trunks. A rational mechanism for theoriental growth of the BiVO4 dendrites is discussed. The preparation of BiVO4 dendrites with well-dened shapes may open newopportunities for wide applications of future nanodevices.