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朴仁鎬,趙玄哲 慶北專門大學 1993 慶北專門大學 論文集 Vol.12 No.-
In this paper, Absorbption characteristics of the Carbon-Ferrite Absorber was investigated and discussed the possibility of the electric darkroom. The result were as follows. 1. The permeability (μ_(r)')of specimen was decreased from 2.65 to 1.0 in the range of 1~4(GHz) and kept constant 1.0~0.6 at higher than 4(GHz), the higher the frequency was, the less the valve of μ_(r)" was from 1.67 to 0. 2. The optimum thickness of microwave absorber was 8(mm). 3. The reflective attenuation shows over than -20(dB) from 5.2(GHz) to 7.7(GHz) at 8(mm) thickness
박인호,Park, Inho 한국데이터정보과학회 2014 한국데이터정보과학회지 Vol.25 No.3
설계효과는 새로운 표본설계를 계획하거나 기존 표본조사에 적용된 설계요소의 효율성을 평가하는데 널리 사용된다. 본 연구에서는 Gabler 등 (2006)이 제시한 설계효과모형을 층화이단집락추출의 표본설계로 이루어진 2013 식품소비행태조사에 응용하여 적용하였다. 조사결과를 통해 표본설계모형의 유용성과 적절성에 대해 논의하였다. Design effect is often used in designing and planning sample surveys and/or in evaluating the efficiency of complex design features of the surveys. In this study, we applied Gabler et al. (2006)'s design effect model to 2013 Consumer behavior survey for food that was carried out by stratified two-stage sampling. Usability and adequacy of the design model to a real survey data are discussed and evaluated.