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Pb(Ni<sub>1/3</sub>Nb<sub>2/3</sub>)O<sub>3</sub>-PZT 세라믹스 고용체에서 과잉 NiO첨가에 따른 압전특성 변화
최용길,손영진,권준철,조경원,윤만순,김일호,김영민,어순철,Choi Y. G.,Son Y. J.,Kweon J. C.,Cho K. W.,Yoon M. S.,Kim I. H.,Kim Y. M.,Ur S. C. 한국재료학회 2005 한국재료학회지 Vol.15 No.6
Perovskite $Pb(Ni_{1/3}Nb_{2/3})O_3-Pb(Zr,Ti)O_3[PNN-PZT]$ ceramics were synthesized by conventional ceramic processing technique. In order to modify piezoelectric properties for sensor application in this system, NiO addition was considered to provide $Ni^{+2}$ as an acceptor, which was known to occupy with B site in the structure. The effect of NiO addition up to $8\;mol\%$ on the following piezoelectric properties as well as sintering properties was investigated. When NiO added more than $1\;mol\%$, average grain size was decreased and second phase was found to form. Moreover, the second phase caused decrease in relative dielectric constant $(\varepsilon_{33}T/\varepsilon0)$, electro-mechanical coupling factor $(k_p)$, and piezoelectric charge constant $(d_{33})$, while increasing mechanical quality factor $(Q_m)$. When $1\;mol\%$ NiO was added, density, dielectric properties and piezoelectric properties were abruptly increased.
최용길 한국경영교육학회 2002 경영교육연구 Vol.26 No.-
Today, e-business is steadily growing through the development of internet technology. Especially B2B market has made a marvelous progress by introducing web-based procurement and purchasing system to their companies, while B2B market is slow except for startups such as yahoo, AOL, and e-bay. A consistent definition and a framework for a business model for the internet based business is still non-existent. However, several business models for e-business are working as a trial, such as affiliation model, advertisement model, membership model, virtual retailing model, buyer-led pricing model, and so on. Therefore, the imperative for a sound business model is growing. This paper is an effort to fill in this gap. To develop successful business model, we should consider several web marketing strategies into our business models as following: (1) differentiation strategy (2) customer-centered strategy (3) e-CRM strategy, (4) one stop total service strategy, and (5) developing common community for netizen strategy.