http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Are state-owned enterprises under share issuing privatization efficient in China?
( Seung Hun Yu ),( Wu Guang Dong ) 한국국제통상학회 2011 국제통상연구 Vol.16 No.3
We evaluate the performance changes of 23 state-owned enterprises (SOEs) listed on Shanghai Exchange upon share issuing privatization (SIP) in the period 1993-2009. Before listing, we suppose that return on assets (ROA) of SOEs out-perform those of market, but under-perform that of industries. While, the other proxies--return on equity (ROE), total assets turnover (TSTA) and total debt ratio (TLTA)--outperform those of market or industries. After listing, we find that SIP has some positive impacts on their performance. In addition, there are several evidences that SOEs are more effective than a selected group of privatized enterprises and markets in terms of profitability, output and leverage condition. We also find that SOEs` stock returns are statistically insignificant compared with market or other control sample returns up to four years after IPO. In a word, according to variations of firm performance studied in the period three years before and three years after privatization, we conclude that SOEs are rather more efficient than private enterprises in profitability and output.
Seunghun Yu,Bongsuk Sung,Kyungyun Hwang 한국무역연구원 2013 무역연구 Vol.9 No.2
This paper is to examine the dynamic relationship between export specialization and technological capabilities of renewable energy technology sectors, especially focusing on bio, wind and solar energy, using panel data from 21 OECD countries (1993-2008). Several panel unit root and cointegration tests are applied, and cross-sectional dependence is detected in the case of solar energy technologies. Subsequently, the long-run technological capacity elasticity is computed using the dynamic OLS and pooled mean group (PMG) techniques in the case of bio and wind energy technologies confirmed that there are co-movements among the variables. Panel system GMM estimations were conducted to avoid the correlation and endogeneity problems in the model. Then, based on the first difference GMM estimation results, causality is determined by running Wald tests on the coefficients of variables. There are solid and convincing evidence of a long-run relationship between export specialization and technological capabilities in bio and wind energy technologies. There is no causal relationship running from technological capabilities to export specialization but there is a positive causal relationship running from export specialization to technological capabilities in the case of bio and wind energy technology sectors. There is no bidirectional causal relationship between the two variables in solar energy technology. The results suggest that countries should instead set up long-run public policies to promote exports of renewable energy technologies. In particular, technological capabilities should continue to be directed toward creating reliable elasticity with regard to exports.
강희완,이병련,SeungHunYu 한국식물병리학회 2003 Plant Pathology Journal Vol.19 No.5
Twenty universal rice primers (URPs) were used to detect PCR polymorphisms in 25 isolates of six different Alternaria species producing host specific toxins (HST). Eight URPs could be used to reveal PCR polymorphisms of Alternaria isolates at the intra- and inter-species levels. Specific URP-PCR polymorphic bands that are different from those of the other Alternaria spp. were observed on A. gaisen and A. longipes isolates. Unweighted pair-group method with arithmetic mean (UPGMA) cluster analysis using 94 URP polymorphic bands revealed three clustered groups (A. gaisen group, A. mali complex group, and A. logipes group).