http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
고강도의 지구성 운동 수행에 의한 근비대 신호 단백질 mTOR, p70S6K, 4E-BP1 및 AMPK의 발현 변화
한광호(Han Gwang-Ho),권형태(Kwon Hyeong-Tae),손희정(Son Hee-Jeong),채정훈(Chai Jung-Hoon),선주상(Shan Zhou-Xiang),김효정(Kim Hyo-Jeong),김창근(Kim Chang-Keun) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.3
The present study was performed to investigate the effect of endurance running on muscle protein synthesis. Male Sprague-Dawley rats(n = 49) were randomly assigned to the time course of the treadmill running (VO₂max 75-80%, 1hr). Muscle samples were obtained before and recovery period of the exercise (immediately, 30 min, 1hr, 2hr, 3hr and 6hr from the running) at the soleus muscle for the determination of mammalian target of rapamycin (mTOR), p70S6 kinase (p70S6k), eukaryotic initiation factor (eIF) 4E-binding protein (4E-BP1) and AMPK phosphorylation. Endurance exercise generated a significant increase in mTOR phosphorylation immediately after exercise and the phosphorylation maintained up to 6hr of recovery (∼90%, p=.024). In addition, 4EBP1 phosphorylation was significantly increased at the immediately after exercise and decreased up to an hour recovery. However, 4EBP1 was resumed to increase for 2-3hrs during recovery (∼48%, p=.05). However, Phosphorylation of p70S6K was elevated above rest level throughout the 6hrs recovery and reached peak at 6hr recovery (303%, p=.001). On the other hand, Phospho-AMPK (Thr172) was increased from 30min to 3hr of recovery (p<.05). These results clearly demonstrate that intensitive endurance running result in significant differences in protein signaling of muscle protein synthesis.
한광호(Gwang-Ho Han) 한국산업경제학회 2012 산업경제연구 Vol.25 No.5
본 연구에서는 지역간 생산구조의 이질성을 고려하여 광주·전남 제조업의 총요소생산성을 추정하고 그 구성요인으로 분해한다. 이를 위해 지역더미와 지역특화지수를 도입한 고정효과 확률적변경생산함수(fixed-effects stochastic production frontier)를 추정하고, 이를 근거로 총요소생산성과 그 구성요인- 기술진보와 생산효율성(기술효율성, 규모효율성 및 배분효율성) 변화요인 그리고 지역특화요인 - 들을 분석한다. 본 연구에서 사용한 자료는 광주·전남 제조업의 시계열자료(1999∼2009, 11개년)와 횡단면자료(27 시군구)로 구성된 패널자료(panel data)이다. 본 연구의 추정결과와 시사점을 요약하면 다음과 같다: 첫째, 광주·전남 제조업에는 기술비효율성이 유의적으로 존재하며, 효율성 변화가 총요소생산성에 미치는 효과는 지역과 제조형태에 따라 다르다. 둘째, 비중립적 기술진보가 이루어지고 있으며, 그 유형은 노동사용적이며 자본절약적이었다. 셋째, 규모보수는 불변이거나 체증수익이라고 하더라도 유의성이 낮고 미미한 크기였으며, 따라서 규모요인이 총요소생산성에 주는 효과는 없거나 있다고 하더라도 크지 않았다. 넷째, 지역특화지수가 총요소생산성에 주는 효과는 긍정적이지만, 표본기간동안 지역특화지수의 증가율이 크지 않아 지역특화요인이 총요소생산성에 주는 효과는 미미하였다. 그러나 지역특화지수의 탄력성이 양으로 계측되었음을 감안할 때, 지역산업의 입지여부는 집적경제 혹은 규모경제의 긍정적 효과를 극대화할 수 있도록 지역특화도를 고려하여 모색하는 것이 바람직할 것이다. 다섯째, 총요소생산성의 구성요인들은 지역과 제조형태에 따라 그 크기와 부호가 상이하게 나타났지만, 대체로 기술진보와 기술효율성 개선이 가장 중요한 요인이었다. 따라서 총요소생산성 향상을 위해서는 R&D 투자 및 첨단기술 도입 등을 통한 적극적인 기술개발도 중요하지만, 근로자 교육과 노동력의 질적 제고 등을 통한 기술 효율성의 개선 노력 또한 필요하다 할 것이다. This paper estimates total factor productivity (TFP) growth and decomposes its contributing factors into technical progress, technical efficiency change, scale efficiency change, and regional production specialization change for the manufacturing sector of Gwangju and Jeonnam. The fixed-effects stochastic production frontier model, which incorporates regional dummy and regional production specialization index to account for differences in the regions" productive structures, is applied to panel data set of 27 Gwangju-Jeonnam regions over the period 1999-2009. The empirical results are as follows; (1) The effects of technical efficiency change on TFP growth are different across both regions and manufacturing types. (2) The technical progress is non-neutral onward to labor-using and capital-saving. And technical progress, jointly with technical efficiency change, are influential factors on TFP growth. (3) The returns to scale in labor and capital are increasing slightly. However the hypothesis of constant returns to scale cannot be rejected. So scale efficiency change has insignificant and small influences on TFP growth. (4) Higher production specialization contributes positively to regional TFP growth. But the effects of specialization are minor, because growth rates of specialization during the sample period are very small or negative. (5) The effects of contributing factors on TFP growth vary across both regions and manufacturing types. Technical progress and technical efficiency change are most important components among the factors.
스폰서 소유권이 리츠의 시장 위험과 유동성 위험에 미치는 영향
한광호 ( Gwang Ho Han ),노승한 ( Seung Han Ro ) 한국부동산원 2021 부동산분석 Vol.7 No.1
This paper investigates effects of sponsor ownership on the Market Risk (Systematic risk) and the Liquidity Risk using Asian real estate investment trust (REIT) data. Previous literature warns that the sponsored REIT structure may cause the agency problem, and insists that the sponsor ownership management relieves the agency problem. However, our empirical findings show that there is an inverse-U relationship between the sponsor ownership and the two risks (the market risk and the liquidity risk), which indicates that from the risk management perspective, the sponsor ownership management has no effect. This finding can be explained by the fee business model. The sponsor has a motivation for the asset secularization, and an external manager who makes an option contract of performance, acquisition, and divestment fee with REIT has a motivation for the aggressive management style. In particular, the sponsor has the position of both parties in property transactions. In consequence, Asian REITs take a risk of excessive related party transactions. The findings of this study suggest that the REITs’ governance and regulations need to be improved for monitoring of the related party transaction (RPT) and the fee contract, in relation to control structure and in a systematical level.
한국 제조업의 생산성 결정요인 : 비모수적 맴퀴스트 생산성 지수에 의한 분석
한광호(Gwang Ho Han) 한국경제학회 2001 經濟學硏究 Vol.49 No.4
This paper estimates the non-parametric Malmquist productivity indices for Korean manufacturing industries, to decompose the sources of total factor productivity (TFP) growth into technical change and technical efficiency change. The results based on data from 1985-1994 show that the contribution of technical progress was higher than that of technical efficiency improvement in the TFP growth, and that the contribution of scale efficiency change was similar to that of pure efficiency change in the improvement of technical efficiency, and that the rates of technical progress and technical efficiency improvement and TFP growth were weakened in early 1990s, and that technical change and technical efficiency change did not always move together.