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이진홍,이병오,신용광 한국농업정책학회 2005 농업경영정책연구 Vol.32 No.4
In recent years, Consumers has appeared to be more interested in the food safety problem, hazard or risk regarding bovine spongiform encephalopathy(BSE), food and mouth disease(FMD) and avian influenza(AI), etc. This paper focuses on the evaluation of such a food safety and confidence, and so we examined it by a 5-point Likert-type scale on consumers, which carried out a factor analysis and multiple regression, according to demographic and socio-economic factor such as gender, age, educational level and economic status. In a sense, For choosing a good model from several things such as linear model, log model and semi-log model, I would like to estimate the model using Box-Cox transformation. Furthermore, In order to estimate confidence interval on the WTP of the food safety, we made use of Bootstrap techniques.
이진홍,박병옥 한국결정성장학회 2001 韓國結晶成長學會誌 Vol.11 No.2
($Ba_x$$Sr_{1-x}$)$TiO_3$ (x=0.9, 0.7, 0.5)박막을 졸-겔법으로 ITO-coated glass기판 위에 제조하였다. BST의 perov-skite상 생성온도는 $600^{\circ}C$ 이상이며 Sr함량이 증가할수록, $Ba^{2+}$ 이온보다 작은 $Sr^{2+}$ 이온에 의해 perovskite상들의 피크가 높은 회절 각도로 이동하였다. 그리고 온도가 증가할수록 결정립은 조대화 되었고, Sr 함량이 증가할수록 결정립은 미세화 되었다. BST(50/50)의 유전상수 값은 다른 두 조성보다 큰 값을 나타내고 유전손실 값은 더 낮았다. 1 kHz때의 BST(50/50)박막의 유전상수 및 유전손실 값은 각각 652와 0.042였다. ($Ba_x$$Sr_{1-x}$)$TiO_3$ (x=0.9, 0.7, 0.5) thin films were prepared on ITO-coated glass by sol-gel method. Perovskite phase formation temperature of BST thin films seemed to be higher than $600^{\circ}C$. Peaks of perovskite phase shift to high diffraction angles as the Sr/(Ba+Sr) ratio was increased, due to the smaller ionic size of $Sr^{2+}$ than $Ba^{2+}$ . As a heating temperature was increased, the grain became coarser. And as Sr/(Ba + Sr) ratio was increased, the grain became finer. Dielectric constants of the BST(50/50) thin film are higher and dielectric losses of that are lower than those of the others. Dielectric constant and dielectric loss of the BST(50/50) thin film were 652 and 0.042 at 1kHz, respectively.