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- 저자 : 김보례 ( Bo Rye Kim ) (검색결과 2 건)
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패널 VAR를 이용한 부가가치 기준 무역과 경제성장과의 인과관계 분석
김보례 ( Bo Rye Kim ) 한국국제통상학회 2015 국제통상연구 Vol.20 No.1
1990년대 중반 이후 글로벌 가치사슬이 심화되어 기존의 무역통계는 국가 간의교역구조를 파악하는데 적절한 지표가 아니라는 문제가 제기되기 시작하였다. 이에 본 논문에서는 세계투입산출표를 이용하여 1995~2009년간의 부가가치 기준 무역이라는 새로운 무역통계를 산출하고 이와 경제성장과의 관계를 패널 VAR를 이용한 Granger 인과관계 분석을 하였다. 그 결과 산업별 소득 수준별로 결과에 약간의 차이는 있으나 대체로 부가가치 이입(부가가치 기준으로 본 수출)과 경제 성장과는 양방향 인과관계가 있는 것으로 나타났다. Recently the production processes from material procurement to marketing have been split up into many stages and the value added from the production was divided among various countries. Therefore, we need to approach the international trade in terms of value added rather than gross value. So following Stephrer(2012)``s methodology, this paper firstly measures Trade in Value added database using World Input-Output “ ” Tables(WIOT). We also examines the causal relationship between economic growth(a gross value of domestic production) and export of trade in value added using panel VAR model. Our test supports the export-led growth hypothesis when we test causal relationship between export of gross trade and economic growth. However almost all results represent that there are two-way causalities between export of trade in value-added and economic growth.
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Surface Structures of CoOx/TiO2 Catalysts for Continuous Wet Oxidation of TCE
김보례,김문현 대구대학교 환경기술연구소 2005 미래환경기술 Vol.1 No.2
XRD and XPS measurements have been conducted to characterize a fresh 5% CoO_(x)/TiO₂ and the spent catalyst used for the wet TCE oxidation at 310 K for ca. 6 h. The XPS spectra of the both sample gave significant difference in surface spectral features for CoO_(x) species. The binding energy for Co 2p_(3/2) of the fresh catalyst appeared at 781.3 eV, which was very similar to the chemical states of CoTiO_(x) such as Co₂TiO₄ and CoTiO₃. The spent catalyst indicated a 780.3-eV main peak for Co 2p_(3/2) with a satellite structure at a higher energy region and this binding energy was almost equal to that of Co₃O₄ among reference Co compounds used here. XRD measurements for fresh and used 5% CoO_(x)/TiO₂ catalysts represented the phase structure of Co₃O₄ even before reaction, as revealed by a comparison with the reference Co compounds. Based on these XPS and XRD results, a tenable model structure of CoO_(x) species existing with the fresh catalyst can be proposed to be predominantly Co₃O₄ encapsulated completely by very thin film-like CoTiO_(x) consisting of Co₂TiO₄ and CoTiO₃ (Type A), with a very small amount of Co₃O₄ covered partially by such cobalt titanates (Type B) which may be responsible to the initial catalytic activity. Such CoTiO_(x) overlayer on Co₃O₄ particles may be readily removed into the wet media for the initial reaction period at 310 K, thereby giving rapid increase in the catalyti cactivity up to 1 h, as indicated during the heterogeneous wet catalysis. This model can offer reasonable explanation on the earlier activity profile of 5% CoO_(x)/TiO₂ catalyst for the wet TCE oxidation at 310 K.
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