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[리하르트 바그너 탄생 200주년] R. 바그너의 생애와 작품
조성진 대우재단 2013 지식의 지평 Vol.- No.14
'스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.
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"Overeducation" in the Korean Labor Market: Evidence from Young Workers
조성진,이수형 한양대학교 경제연구소 2014 JOURNAL OF ECONOMIC RESEARCH Vol.19 No.1
This paper examines the prevalence of “overeducation” in Korea and its economic implications. By overeducated workers, we mean those whose educational attainment exceeds the level of education their jobs require. Analyzing a sample of young college-educated workers, we find that approximately a quarter of workers are overeducated and these overeducated workers are paid significantly less and have lower job satisfaction compared to their counterparts who are adequately educated. Furthermore, overeducated workers are less likely to be employed or to work for the same firm in a subsequent period, but more likely to experience faster wage growth than adequately educated workers.
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조성진,유정근 한양대학교 경제연구소 2007 JOURNAL OF ECONOMIC RESEARCH Vol.12 No.1
This paper shows the economic effects after Korea-U.S. FTA through Panel Model and Simultaneous Equation Model. First of all, the panel analysis results of industrial trade creation effects due to the tariff elimination after Korea-U.S. FTA are as below. It can be expected for Korea to increase the amount of exports ; 108.1 million dollars in the field of transport industries (automobiles/parts and other transportation instruments) and 1.14 million dollars in the field of telecommunication industries. For the U.S., it can be expected to increase the amount of exports ; 25.16 million dollars in the field of precision industries, 4.42 million dollars in the field of telecommunication industries, and 0.27 million dollars in the field of computer industries. In addition, the social welfare effects in the rice market of Korea are as below, i.e. supposing that the only rice market is opened and the quality of rice harvested in Korea and the U.S. is the same. In case that the Calrose rice can be distributed fully in Korea market and the rice price in the U.S. is applied in Korea, total social welfare is estimated to increase about 1,981.6 billion wons. If the social welfare effect is divided into consumer's surplus and producer's surplus, it can be expected for consumers in Korea to be benefitted about 8,675.9 billion wons. However, it can be expected welfare loss about 6,694.2 billion wons for workers in the rice industries of Korea. This paper shows the economic effects after Korea-U.S. FTA through Panel Model and Simultaneous Equation Model. First of all, the panel analysis results of industrial trade creation effects due to the tariff elimination after Korea-U.S. FTA are as below. It can be expected for Korea to increase the amount of exports ; 108.1 million dollars in the field of transport industries (automobiles/ parts and other transportation instruments) and 1.14 million dollars in the field of telecommunication industries. For the U.S., it can be expected to increase the amount of exports ; 25.16 million dollars in the field of precision industries, 4.42 million dollars in the field of telecommunication industries, and 0.27 million dollars in the field of computer industries. In addition, the social welfare effects in the rice market of Korea are as below, i.e. supposing that the only rice market is opened and the quality of rice harvested in Korea and the U.S. is the same. In case that Calrose rice can be distributed fully in Korea market and the rice price in the U.S. is applied in Korea, total social welfare is estimated to increase about 1,981.6 billion wons. If the social welfare effect is divided into consumer’s surplus and producer’s surplus, it can be expected for consumers in Korea to be benefitted about 8,675.9 billion wons. However, it can be expected welfare loss about 6,694.2 billion wons for workers in the rice industries of Korea.
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Technology Cycle and its Multiple Equilibria
조성진 한양대학교 경제연구소 2009 JOURNAL OF ECONOMIC RESEARCH Vol.14 No.2
This paper shows the existence of multiple equilibria in technology the cycle. According to Cho (2008), two main reasons of faster replacement demand for main computer systems are faster technological progress and increased demand for services a telecommunication company provides. This paper primarily focuses on the role of faster technological progress due to the faster replacement demand for mainframe computer systems. The cyclical relationship among replacement demand for mainframe computer systems, faster technological progress, and R&D expenditure shows multiple equilibria in technology. The technology cycle can happen as follows. Increased replacement demand for mainframe computer systems is induced by faster technological progress in computer industry. Then, this induced replacement demand can increase R&D expenditure in the computer industry. Again, this increased R&D expenditure also causes faster technological progress. Using data from Cho (2008) and a simple calibration, I show the existence of multiple equilibria in the above technology cycle, which exist in both the lower part and higher part of technology cycle.
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The Effectiveness of Parametric Approximation: A Case of Mainframe Computer Investment
조성진 한양대학교 경제연구소 2008 JOURNAL OF ECONOMIC RESEARCH Vol.13 No.1
The general method to solve the fixed point problem is a discretization of observed state variables. When the observed state variable is continuous, the required fixed point is in fact an infinite dimensional object. Therefore, in order to solve the fixed point problem, it is necessary to discretize the state space so that the state variable takes on only finitely many values. But there are limits regarding this method: (i) "curse of dimensionality"; (ii) the limits it places on our ability to solve high-dimensional DP problems. Despite these limits, this method have been used in many literature. However, The discretization method may not be applicable to computer replacement research to solve the fixed point problem, because of the aforementioned problems. Using a detailed data set on computer holdings by one of the world's largest telecommunication companies, this paper shows the effectiveness of Parametric Approximation procedure by comparison with the discretization method, which converts the contraction fixed-point problem into a nonlinear least squares problem with combining maximum likelihood estimation method to estimate the unknown parameters.
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