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Preparation of bismuth ferrite nanopowders at different calcination temperatures
Chunlin Fu 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.5
BiFeO3 powders were prepared by a sol-gel process at different calcination temperatures. The DTA curve shows an obvious exothermic peak near 480.5 ο C, a temperature close to the BiFeO3 formation temperature, which is in agreement with the XRD result (450 ο C). Having been calcined at 600 ο C for 1 h, XRD spectra has the emergence of several sharp diffraction peaks in correspondence with the standard XRD spectrum of the crystalline BiFeO3. As the calcination temperature was increased, the diffraction peak intensity of the XRD spectra of BiFeO3 gradually was enhanced and the diffraction peaks became sharper. There is a clear endothermic peak near 825.1 ο C, which is the transition temperature from the α phase to β phase and in good agreement with the reported Curie temperature. The average size of powders determined by XRD and TEM gradually increases with an increase in the calcination temperature. A shell-core structure is distinctly observed in powders calcined at 400 ο C.
Chunlin Jin,Yeongmi Park,Euiyoung Cha 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.2Ⅱ
Human face detection plays an important role in variable applications. A face detection method based on skin-color information and facial feature in color images is proposed in this paper. First. the RGB color space is transformed to YCbCr space and only the skin region is extracted with the skin color information. And then, the candidate where face is likely to exist is selected after labeling processing. Finally, we detect facial features in face candidate. The experimental results show that the method proposed here is effective.
Chunlin Yuan,Kyung Hoon Kim,Juran Kim,Xiaolei Yu,Yanan Yan 글로벌지식마케팅경영학회 2018 Global Marketing Conference Vol.2018 No.07
The relationship of parasocial Interaction is one of the important contents of marketing research in recent years. With the rise of internet economy in the world, more and more enterprises' marketing practices are involved in the marketing process of SNS based on social networks. The interaction between medium and audiences has broken through the non-face-to-face one-way communication mode and forms a twoway communication mode of the relationship of parasocial Interaction in the SNS environment. Based on the signaling theory and the social exchange theory, this dissertation clarifies the driving factors and mechanism between Fashion web celebrity and attributes and relationship of parasocial interaction through the literature review, In the South China, Middle and North China, there were N audiences who used SNS experience as survey target to conduct a survey. And analyzed these data with SEM software. The research found that between Fashion web Fashion web celebrity and attributes and SNS participation motivation show a positive correlation with relationship of parasocial interaction, and there is a positive correlation between relationship of parasocial interaction and identification, relationship of parasocial interaction and identification have positive correlation with customer equity. E-WOM on customer asset-driven process has a clear intermediary role in the relationship of parasocial Interaction. This not only enriches and develops the existing research results of relationship of parasocial Interaction, but also provides guidance for enterprises to manage relationship of parasocial interactions. In addition, it also provides valuable theoretical guidance for enterprises to promote SNS marketing management practices.