Empirical Analysis on the Industrial Productivity in the Electricity·Gas·Water Service Sector

Zhu, Yan Hua,Kang, Joo Hoon,Park, Sehoon Korea Society of Industrial Information Systems 2015 한국산업정보학회논문지 Vol.20 No.4

The early studies indicated that the firm with monopoly power is likely to engage in X-inefficiency such as a managerial slack. The reflection of the X-inefficiency theory has led to the issue that the public sector may be more inefficient than the private sector. In Korea like other many countries the electricity gas water service which can be considered as natural monopoly have been provided mostly by the public sector. In order to provide the empirical evidence to the argument that the public sector may be more inefficient than the private sector this paper estimated the four types of Solow residual which is called the total factor productivity in the electricity gas water service industry with the associated empirical model and compared its productivity with one in the manufacturing industry. The empirical results do not support the argument that the public sector may be more inefficient or less productive than the private sector.

Medical Tourism Industry in Kangwon Province and Its Economic Impacts on the Region

Yan Hua Zhu,Joo Hoon Kang,Yong-Sik Jung 한국산업정보학회 2014 한국산업정보학회논문지 Vol.19 No.3

This paper has two purposes. The first is to suggest the new and simple method to derive a regional input-output model from national input-output table published by the Bank of Korea. The interregional input-output table has not been devised in spite of its potential use while the national table has been made every five years with the revised version during each five years. Second, this paper aims to derive Kangwon interregional input-output model from the national model using the regional supply proportional of industry and to analyze the effect of medical tourism industry on the regional economy of Kangwon Province. The paper measures, in particular, the effect of medical tourism industry on the financial self-sufficiency of Kangwon Province using the estimated output elasticity of tax revenue with the autoregressive distributed lag scheme ADL(1,1) in which the dependent variable ad the single explanatory variable are each lagged once.<br/>

An Comparative Analysis on Solow residuals in China and Korean manufacturing industries

Yan Hua Zhu,Suk Jung Jeong,Sehoon Park 한국산업정보학회 2014 한국산업정보학회 학술대회논문집 Vol.2014 No.1

The Korean economy has accomplished the high rates of economic growth during the last four decades through the export-led growth strategy by the government. It is well recognized that the export in the Korean manufacturing industries has been still leading the Korean economic growth. On the other hand the Chinese economy has also achieved rapidly economic growth since 1990’s. There have been a lot of studies that the increases in productivity in the manufacturing industries has contributed to the export growth, then leading to the economic growth in Korea and China. The cyclicality of productivity has been one of the essential issues in macroeconomics and industrial economics. Since Solow(1957) developed the dominant approach to the measurement of productivity growth, Solow’s approach, which assumes the perfect competition, the constant returns to scale, and the full use of input factor has been modified particularly in Hall’s (1990) and Basu’s (1996) works. Their researches take account of market power, returns to scale, and variable factor utilization. This paper establishes the empirical model based on Hall’s (1990) and Basu’s(1996) models, estimates 4 types of Solow’s residuals in 8 Korean manufacturing industries over the period 1975:1-2014:4, and in Chinese economy over the period 1990:1-2014:4 and analyzes the cyclicality of measured productivity, comparing the productivities in both countries.

Medical Tourism Industry in Kangwon Province and Its Economic Impacts on the Region

Zhu, Yan Hua,Kang, Joo Hoon,Jung, Yong-Sik Korea Society of Industrial Information Systems 2014 한국산업정보학회논문지 Vol.19 No.3

This paper has two purposes. The first is to suggest the new and simple method to derive a regional input-output model from the national input-output table published by the Bank of Korea. The interregional input-output table has not been devised in spite of its potential use while the national table has been made every five years with the revised version during each five years. Second, this paper aims to derive Kangwon interregional input-output model from the national model using the regional supply proportion of industry and to analyze the effect of medical tourism industry on the regional economy of Kangwon Province. The paper measures, in particular, the effect of medical tourism industry on the financial self-sufficiency of Kangwon Province using the estimated output elasticity of tax revenue with the autoregressive distributed lag scheme ADL(1,1) in which the dependent variable and the single explanatory variable are each lagged once.

한국과 중국의 제조산업의 솔로우 잔차항에 관한 비교실증분석

( Yan Hua Zhu ),( Sehoon Park ),( Suk Jung Jeong ) 국제지역학회 2014 국제지역연구 Vol.18 No.1

The Korean economy has accomplished the high rates of economic growth during the last four decades through the export-led growth strategy by the government. It is well recognized that the export in the Korean manufacturing industries has been still leading the Korean economic growth. On the other hand the Chinese economy has also achieved rapidly economic growth since 1990`s. The cyclicality of productivity has been one of the essential issues in economics. Since Solow(1957) developed the dominant approach to the measurement of productivity growth, Solow`s approach, which assumes the perfect competition, the constant returns to scale, and the full use of input factor has been modified particularly in Hall`s(1990) and Basu`s(1996) works. This paper establishes the empirical model based on Hall`s and Basu`s models, estimates 4 types of Solow`s residuals in 8 Korean manufacturing industries and in Chinese economy and analyzes the cyclicality of measured productivity, comparing the productivities in both countries.

Empirical Analysis on the Industrial Productivity in the Electricity·Gas·Water Service Sector

Yan Hua Zhu,Joo Hoon Kang,Sehoon Park 한국산업정보학회 2015 한국산업정보학회논문지 Vol.20 No.4

The early studies indicated that the firm with monopoly power is likely to engage in X-inefficiency such as a managerial slack. The reflection of the X-inefficiency theory has led to the issue that the public sector may be more inefficient than the private sector. In Korea like other many countries the electricity·gas·water service which can be considered as natural monopoly have been provided mostly by the public sector. In order to provide the empirical evidence to the argument that the public sector may be more inefficient than the private sector this paper estimated the four types of Solow residual which is called the total factor productivity in the electricity·gas·water service industry with the associated empirical model and compared its productivity with one in the manufacturing industry. The empirical results do not support the argument that the public sector may be more inefficient or less productive than the private sector.

한국 제조업의 수출결정요인분석: 고정효과모형과 확률효과모형

주연화 ( Yan Hua Zhu ),강주훈 ( Joo Hoon Kang ),박세훈 ( Se Hoon Park ) 국제지역학회 2015 국제지역연구 Vol.19 No.2

한국경제는 지난 40년간 정부의 수출주도정책으로 높은 경제성장을 달성하였다. 제조산업에서의 수출은 여전히 한국경제성장을 주도하고 있는 것은 주지의 사실이다. 본 논문은 1975-2010 기간 동안 한국제조산업의 수출성과에 영향을 미치는 산업고유의 결정요소를 고정효과모형과 확률효과모형을 이용하여 분석하고 있다. 주요 분석결과는 다음과 같다. 산업의 생산성이 수출성과에 미치는 효과는 부호는 +로 기대부호와 일치하고 있으나 통계적 유의성은 없는 것으로 나타났다. 반면 산업의 마크업이 수출증가에 미치는 영향은 유의하게 나타났다. 또한 외환위기 이후에 생산요소가격의 급격한 하락은 수출성과에 긍정적으로 영향을 주었으며 특히 자본집약적산업과 해외중간재 비중이 큰 산업에 있어서 수출증가효과는 크게 나타났다. 따라서 분석결과는 산업의 자본집약도와 해외중간재 비중은 산업의 수출성과를 결정하는 주요 변수임을 입증하고 있다. The Korean economy has achieved the high rates of economic growth during the last four decades through the export-led growth strategy by the government. It is well recognized that the export in the Korean manufacturing industries has been still leading the Korean economic growth. The purpose of this paper is to investigate the importance of industry-specific variables in determining the export performance of manufacturing industries in Korea during the period 1975:1-2010:4 using data pooling analysis. Our main findings are summarized as follows. The effect of markup on export growth is highly significant with positive sign. The rapid declines in interest rates and import prices since the foreign crisis occurred should have resulted in the cost advantages in exporting industries, which in turn could have substantially contributed to export growth. Thus, it may be concluded that the ratio of capital to labor and the ratio of foreign intermediate goods to industrial output are significantly industry-specific determinants in explaining the export performance.

자기회귀모형을 이용한 서비스산업의 마크업 결정요인에 관한 실증분석

주연화(Zhu Yan Hua),박세훈(Sehoon Park),정용식(Yong Sik Jung) 한국산업정보학회 2014 한국산업정보학회논문지 Vol.19 No.6

마크업은 Hall(1988)에 의해 한계비용에 대한 가격의 비율로 정의된 이후, 신케인지언들은 시장구조와 경기변동 사이의 관계를 설명하는 데에 마크업의 개념을 이용하여 왔다. 여러 문헌에서 마크업이 경기역행적임을 나타내는 이론모형이 제시되었으며, 실증증적으로 대부분의 연구는 마크업이 경제전체적으로 또는 산업별로 경기역행적임을 밝히고 있다. 또한 한국의 경우 마크업에 관한 대부분의 연구에서 분석대상은 주로 제조산업에 집중된 반면, 특히 서비스산업에서 산업구조의 특성을 밝히는 실증적 분석은 연구가 매우 저조하다고 할 수 있다. 따라서 본 논문은 한국의 5개 서비스산업을 대상으로 마크업의 실증모형을 작성하고 직접적으로 5개의 서비스 산업의 마크업을 측정하고 마크업의 결정요인들을 자기회귀시차모형(ADL(1,1))을 이용하여 분석하였다. Since markup is defined as price over marginal cost by Hall(1988), the New Keynesians have intensively applied its definition in elucidating the relationship between market structure and business cycle. In lots of literatures markups proved to be counter cyclical empirically and theoretically. At the same time many studies analysed the determinants for markup in relation with business cycles. This paper establishes the markup equation based on the constant returns to scale production function including intermediate goods with technology being assumed to be AR(1) process and estimates the industrial markups in the Korean 5 service industries over the period 1975:1-2010:4. The paper also analyzed the markup determinants using the autoregressive distributed lag scheme ADL(1,1) in which the dependent variable and the single explanatory variable are each lagged once.

Impact of a Glyphosate-Tolerant Soybean Line on the Rhizobacteria, Revealed by Illumina MiSeq

( Gui-hua Lu ),( Yin-ling Zhu ),( Ling-ru Kong ),( Jing Cheng ),( Cheng-yi Tang ),( Xiao-mei Hua ),( Fan-fan Meng ),( Yan-jun Pang ),( Rong-wu Yang ),( Jin-liang Qi ),( Yong-hua Yang ) 한국미생물 · 생명공학회 2017 Journal of microbiology and biotechnology Vol.27 No.3

The global commercial cultivation of transgenic crops, including glyphosate-tolerant soybean, has increased widely in recent decades with potential impact on the environment. The bulk of previous studies showed different results on the effects of the release of transgenic plants on the soil microbial community, especially rhizosphere bacteria. In this study, comparative analyses of the bacterial communities in the rhizosphere soils and surrounding soils were performed between the glyphosate-tolerant soybean line NZL06-698 (or simply N698), containing a glyphosate-insensitive EPSPS gene, and its control cultivar Mengdou12 (or simply MD12), by a 16S ribosomal RNA gene (16S rDNA) amplicon sequencing-based Illumina MiSeq platform. No statistically significant difference was found in the overall alpha diversity of the rhizosphere bacterial communities, although the species richness and evenness of the bacteria increased in the rhizosphere of N698 compared with that of MD12. Some influence on phylogenetic diversity of the rhizosphere bacterial communities was found between N698 and MD12 by beta diversity analysis based on weighted UniFrac distance. Furthermore, the relative abundances of part rhizosphere bacterial phyla and genera, which included some nitrogen-fixing bacteria, were significantly different between N698 and MD12. Our present results indicate some impact of the glyphosate-tolerant soybean line N698 on the phylogenetic diversity of rhizosphere bacterial communities together with a significant difference in the relative abundances of part rhizosphere bacteria at different classification levels as compared with its control cultivar MD12, when a comparative analysis of surrounding soils between N698 and MD12 was used as a systematic contrast study.

Addendum: A phase II trial of cytoreductive surgery combined with niraparib maintenance in platinum- sensitive, secondary recurrent ovarian cancer: SGOG SOC-3 study

Ting-Yan Shi,Libing Xiang,Jianqing Zhu,Ji-hong Liu,Ping Zhang,Hua-ying Wang,Yanling Feng,Tao Zhu,Yingli Zhang,Aijun Yu,Wei Jiang,Xipeng Wang,Yaping Zhu,Sufang Wu,Yincheng Teng,Jiejie Zhang,Rong Jiang 대한부인종양학회 2022 Journal of Gynecologic Oncology Vol.33 No.4