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Surface roughness improvement of alumina substrates coated using aluminum nitride sol gel
Chein-Hui-Yang,Chih-Neng Yang,Ying-Chieh Lee 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.9
To improve the surface roughness of alumina substrates, the AlN precursor mixtures were coated on the alumina substrates. AlN precursor mixtures were coated on Al2O3 substrates using a sol-gel method. The AlN precursor mixtures were preparedusing urea, aluminum nitrate, sucrose and a surfactant. The effects of calcination temperature and soaking time on the phase evolution, microstructure, mechanical properties and surface roughness of the coating layer were investigated. The phase evolution, microstructure and constitution of the coating layer after calcination were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and electron spectroscopy for chemical analysis (ESCA). It was found that Al-N-O and Al2O3 phases can coexist at 1300 o C after soaking for ≤ 60 min in N2/H2 atmosphere. The adhesive strength ofcoating layer significantly increased with increasing calcination temperature. The surface roughness of Al2O3 substrates can be improved using AlN sol gel at 1300 oC. However, the surface roughness was obviously increased at 1500 o C.
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Evaluation of children's after-school programs in Taiwan: FAHP approach
Amy H. I. Lee,Chih-Neng Yang,Chun-Yu Lin 서울대학교 교육연구소 2012 Asia Pacific Education Review Vol.13 No.2
The need of after-school programs has become urgent for school-age children in many industrialized countries due to social structure changes. This research develops a hierarchical framework to evaluate after-school programs from two distinct aspects-service quality from parents' perspectives and marketing strategy from operators' perspectives-each aspect respectively associated with five mutually independent criteria. Two different questionnaire surveys are conducted respectively to parents and providers in Hsinchu, Taiwan based on pairwise comparison on Saaty's nine-point scale. Fuzzy analytic hierarchy process is then employed to calculate the relative importance of the criteria under each aspect. The results show that the top three concerns from parents' perspectives are communication and attentiveness, teacher qualification and counseling, and fee and location, whereas the top three concerns from operators' perspectives are promotion, price, and product. Our findings reveal a consistency between the concerns of parents and of operators, but the important rankings from the two perspectives are not exactly the same, implying that the parents and the operators do have somewhat different viewpoints in evaluating the after-school programs.
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