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배상근(Sang-Kun Bae) 한국경제연구원 2002 규제연구 Vol.11 No.2
The objective in this paper is to investigate Issues of long-run neutrality and long-run superneutrality for Korea using Fisher and Seater (1993) model and to analyze effectiveness of money as an information variable under the Korean monetary policy framework. It is found that money is long-run neutral and that the long-run superneutrality of the narrowly defined money can not be rejected. However, broader-based measures of the money stock such as M3 are not long-run superneutral. This finding suggests that money is long-run neutral within the Fisher and Seater (1993) framework. Also, the introduction of dummy variables to capture recent extraperiod, the Korean financial crisis, does not change the findings. Thus, since the money stocks have proportional relationships to both price and nominal output from the long-run viewpoint, long-run effectiveness of monetary index, which a role as policy index recently weakened, has been remained.
배상근(Sang Keun Bae),최수영(Soo Young Choi) 계명대학교 낙동강환경원 2011 環境科學論集 Vol.15 No.1
As the first stage of the development in a water treatment system for highly concentrated turbid water, a laboratory test is conducted using ion coated natural zeolite. The stirring strength, zeolite dosage, and the change of turbidity after injecting zeolite into 1,000㎖ beaker containing highly concentrated turbid water are observed through time. By keeping the amount of highly concentrated turbid water as 1,000㎖, 60rpm slow stirring rate and 120rpm rapid stirring rate are applied. Different amounts of zeolite are employed as follows: 70㎎, 90㎎, 110㎎, 120㎎, and 150㎎. The analysis of 150min is conducted after input zeolite. In the case of slow stirring rate with 150㎎ zeolite injection, the turbidity changes from 1,446NTU to 17NTU, and the removal efficiency of turbidity is 98.82%. In rapid stirring rate application, with 150㎎ zeolite, it drops from 1,382NTU to 15NTU, and the removal efficiency of turbidity shows 98.91%. In addition, the turbidity of highly concentrated turbid water is rapidly decreased. From these experimental results, we could confirm that zeolite has high reducing effect in highly concentrated turbid water.
배상근 ( Sang Keun Bae ) 한국환경과학회 2016 한국환경과학회지 Vol.25 No.1
In this paper, a groundwater hydrological study of the Gyeongju well during the Silla period is conducted to investigate how sufficiently the Gyeongju well supplied water demand at the time. It is assumed that the current geology and soil condition in Gyeongju remain similar to the Silla period. Also, the land use and land coverage during the Silla period is estimated based on the current land condition in Gyeongju. Precipitation during the Silla period is analyzed using precipitation data from 1984 to 2014 provided by Gyeonju weather station. Precipitation analysis is applied based on 3 different scenarios; precipitation intensity during the Silla period was Case ① the same as, Case ② 30% more, and Case ③ 30% less than the precipitation intensity of the last decade (2005~2014). Furthermore, to observe the use of the well in Gyeongju during droughts, the following condition(Case ④) is also considered; ten year drought during the Silla period was the same as the ten year drought from 1984 to 2014. Available amount of groundwater development is analyzed using NRCS-CN method. The results show that the potential amount of groundwater in Gyeongju during Silla era was for Case ① 62,825,272 ㎥/year, Case ② 93,606,567 ㎥/year, Case ③ 32,277,298 ㎥/year, and Case ④32,870,896 ㎥/year. Also, it has been shown that 45,260,000 ㎥ of groundwater were required to supply to all households in Gyeongju during Silla era. Therefore, if the precipitation intensity during Silla era was similar with the last decade, the groundwater would provide enough supply to all households in Gyeongju. However, in the case that the precipitation intensity during Silla era was 30% less than the last decade or a ten year drought happened, it is predicted that the water use in Gyeongju would have been limited.