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- 저자 : 양창준 ( Chang Joon Yang ) (검색결과 2 건)
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정보통신산업 공공 연구개발(R&D)투자의 파급효과 분석
양창준(Chang joon Yang),홍정식(Jung sik Hong),고상원(Sang won Ko) 한국경영과학회 2008 經營 科學 Vol.25 No.3
We investigate the effect of government and public sector R&D investment at IT industry on the amount of production, export and nongovernment R&D investment at IT industry. We, firstly, examine the stationarity of each variable by the unit root t-test and perform the co-integration test for the pairs of variables. We use VECM(Vector Error Correction Model) according to the results of co-integration test for the examination of Granger-causality between variables. It is found that there exist an Granger-causality between public sector R&D investment and nongovernment R&D investment and also between public sector R&D investment and export. Secondly, we analyze the impulse response of government and public sector R&D investment at IT industry on the amount of production, export and nongovernment R&D investment at IT industry based on VECM model. It is found that the response of the amount of production is highest at 3th period and is lowest at 8th period and that of export shows similar pattern.
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국내 IT 산업 부문 간 효율성 비교 평가: 자료포락분석(DEA) 기법을 중심으로
홍정식 ( Jung Sik Hong ),양창준 ( Chang Joon Yang ),이학연 ( Hak Yeon Lee ) 한국경영공학회 2012 한국경영공학회지 Vol.17 No.1
This study measures and compare efficiency of the eight Korean IT sectors. Data envelopment analysis (DEA) is employed to measure efficiency of about 900 firms with annual sales over 10 billions won in the following eight sectors: telecommunication service, wireless communication service, digital contents, broadcasting service, wireless communication device, semiconductor, display panel, and computer-related service. DEA is a linear programming model for measuring the relative efficiency of decision making units (DMUs) with multiple inputs and outputs. Total number of employees, amount of investment, and cost of sales are considered as inputs, and output variables include value added, net income, and sales. Every firm in every sector is evaluated together by DEA, and then, Kruskal-Wallis test is run to compare the efficiency of the sectors. It is found that wireless communication service and telecommunication service have relatively high efficiency while digital contents, wireless communication device, and semiconductor show low performance. The results of efficiency evaluation and benchmarking way for improving efficiency obtained from this study are expected to provide fruitful implications for IT policy making.
ScienceON
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