• 유통과학연구
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• 제18권1호
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• pp.71-83
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• 2020

Purpose: Because the energy consumption, economic growth and logistics development are still the heated topics which have attracted many scholars' interests. Therefore, this paper attempts to analyze the effect of logistics development on the economic growth, explore the effect of the economic growth on energy consumption and to discuss the effect of the logistics development on energy intensity. Research design, data and methodology: Using the panel data over the period 2000-2017 of 156 countries and employing the country & year fixed effect model, system generalized method moments and random effect model, the empirical analyses of this propositions are performed. Results: The empirical findings present that the logistics development is positively related to the economic growth. The energy consumption in the t-1 period and economic growth are positively related to the current energy consumption. The logistics development is negatively related to the energy intensity. Meanwhile, the empirical findings also indicate that there is a great difference about these effects among the four sub-samples (low income 18 countries, low middle income 49 countries, upper middle income 44 countries, high income 49 countries). Conclusions: Based on the evidences in this paper provided, we can find that these variables can affect each other.

• 무역학회지
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• 제47권4호
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• pp.233-254
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• 2022

Although there is growing literature evidence of linkages between global value chains (GVCs) and foreign direct investment (FDI), the results are mixed and ambiguous by geographic dimension, time period and sectoral scope. Moreover, bilateral approaches on these connections have been rarely analyzed. In this context, we investigate the effect of bilateral greenfield FDI and cross-border M&A on GVC linkages between host countries and source countries. We match three-year averages of bilateral FDI and UNCTAD-Eora GVC value-added data from 2005 to 2019 between 37 OECD sources and 176 host countries (37 OECD versus 139 non-OECD countries). In the structural gravity model, the empirical specification includes bilateral and country-period fixed effects and uses a Poisson Pseudo-Maximum Likelihood (PPML) estimator. We find that greenfield and M&A FDI promote forward and backward GVC linkage for all sectors between OECD countries, whereas greenfield FDI promotes backward GVC linkage between OECD and non-OECD countries. In addition, the results indicate that the degree of influence of GVCs by FDI flows is greater for forward GVC than backward GVC among OECD countries.

• Journal of health informatics and statistics
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• 제43권4호
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• pp.290-299
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• 2018

목적: 식욕억제제인 펜터민의 투여에 따른 체중과 심박수 변화를 출판된 문헌을 토대로 메타분석을 시행하여 평가하고자 한다. 방법: 펜터민 투여군과 위약군의 체중과 심박수 변화를 측정한 무작위배정비교임상시험을 대상으로 PubMed, EMBASE, Cochrane library와 5개의 국내 전자데이터베이스 등 모두 8개의 전자데이터베이스로부터 검색전략에 따라 문헌들이 수집되었다. 메타분석에 따른 통합효과크기의 추정은 Mantel-Haenszel법에 의한 고정효과모델이 사용되었으며, 연구 간의 이질성이 존재하는 경우 변량효과모델이 사용되었다. 결과: 메타분석은 12개의 연구, 677명의 대상자에 대해 시행되었다. 펜터민의 투여에 따른 체중변화의 통합효과크기 추정치(SMD)는 -1.37 (95% 신뢰구간: -1.55, -1.19)로 통계적으로 유의하였으며, 출판연도, 국가, 펜터민의 용량, 추적관찰기간에 따른 하위그룹 분석에서 하위그룹 간 이질성은 나타나지 않았다. 펜터민의 투여에 따른 심박수 변화의 통합효과크기 추정치는 0.64 (95% 신뢰구간: 0.35, 0.92)로 통계적으로 유의하였다. 결론: 펜터민의 투여는 위약에 비해 유의하게 체중을 감소시키나, 심박수를 증가시킨다.