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趙誠烈 東亞大學校 大學院 1988 大學院論文集 Vol.13 No.-
The first part of this paper is to review the central issues of controversy on the purchasing power parity(PPP) theory and the productivity bias hypothesis. The second part is empirical test of PPP theory and the productivity bias hypothesis for Korea over the period 1980-1986. PPP theory states that the exchange rate is determined by the level of prices in the domestic compared to the foreign price level, and that the level of prices are not affceted by exchange rate. The foundation of PPP theory is the proposition that general price levels in different countries are connected through the prices of internationally traded goodes. But, empirical investigation have often found deviation of exchange rate from PPP. A fundamental criticism of PPP theory is that the ratio of the price level of nontraded goods to that of traded goods may differ systematically between countries. Therefore, the deviation of exchange rate from PPP involves a divergence between the country's nontradable/tradable price ratio and that of the other country. Bela. Balassa argued that PPP calculated from general price levels deviates from its ture ling-run equilibrium value, and that the most important reason for the deviation is the existence of productivity difference between ountries. Lawrence H.Officer introduced the term "productivity bias hypothesis" to designate the Balassa's argument. Second, the empirical results are as follows (ⅰ)The PPP theory which is used a wholesale price index holds up well over short run for Korea by using monthly data. On the other hand, the PPP theory of GNP deflator based is rejected by using quarterly data. (ⅱ)There exists the largest deviation of the actual exchange rate from PPP of GNP deflator based in Korea. (ⅲ)The nontradable/Tradable price ratio in Korea, USA, and Japan be diverged over the period 1980-1986. (ⅳ)The productivity bias hypothesis is valid, and it has higher explanatory power for the deviation in Korea.
Luminance Characteristics of Organic Electroluminescent Devices Based on Znq12 by Heating
조성렬,정은실,박수길,정평진,Jo, Seong-Ryeol,Jeong, Eun-Sil,Park, Su-Gil,Jeong, Pyeong-Jin Materials Research Society of Korea 1999 한국재료학회지 Vol.9 No.6
The 8-hydroxyquinoline Zinc(Znq2) were prepared successfully from zinc chloride and zinc acetate as two kinds of starting material. The organic electroluminescent devices(ELDs) were fabricated by the structure of ITO/TPD/Znq2/Al with N-N'-diphenyl-N-N'-bis(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine(TPD) which acts hole trasporting layer and bis(8-oxyquinolino) zinc(II)(Znq2) which acts as emission and electron transporting layer. EL efficiency of Znq2 prepared by heating was investigated. The 570nm of main emission peak which is yellowich green was investigated by photo luminesence(PL) and this results shows that electro luminescence(EL) is from Znq2. The V-J curve shows that carrier injection were investigated from 4V. Maximum luminance and luminance efficiency were 1600cd/$\m^2$, 0.9lm/W. From this results, the Znq2 can be one of the useful organic EL material.