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ASEAN 국가에서의 전력소비와 경제성장에 관한 실증분석
유승훈,정군오 한국자원공학회 2005 한국자원공학회지 Vol.42 No.2
The purpose of this paper is to investigate the causal relationship between electricity consumption and economic growth among the ASEAN 4 members, namely Indonesia, Malaysia, Singapore, and Thailand, and to obtain the policy implications of the results. To this end, we attempted to provide more careful consideration of the causality issues by applying time series techniques of Granger-causality over the period 1971-2002. Tests for unit roots, cointegration, and Granger-causality are presented. The results indicate that there is a bi-directional causality between electricity consumption and economic growth in Malaysia and Singapore. This means that an increase in electricity consumption directly affects economic growth and that economic growth also stimulates further electricity consumption in these two countries. However, uni-directional causality runs from economic growth to electricity consumption in Indonesia and Thailand without any feedback effect. Thus, electricity conservation policies can be initiated without causing negative economic side effects in these two countries. 본 연구의 목적은 ASEAN 4개국 즉 인도네시아, 말레이시아, 싱가포르와 태국의 전력소비와 경제성장 사이의 인과관계를 확인하는 것이다. 이 목적을 달성하기 위해 1971년부터 2002년 동안의 자료를 이용하여 Granger-인과성 시계열 분석기법을 적용함으로써 인과성의 문제를 살펴본다. 단위근, 공적분 Granger-인과성에 대한 검정절차 및 결과가 소개될 것이다. 분석결과 말레이시아와 싱가포르의 전력소비와 경제성장 사이에 양방향 인과성이 발견되었다. 이러한 연구결과는 두 국가에서 높은 수준의 전력소비는 높은 수준의 경제성장을 가져올 뿐만 아니라 경제성장 역시 전력소비를 증가시킨다는 시사점을 제공한다. 그러나 인도네시아와 태국에서는 높은 경제성장이 전력소비의 증가를 가져올 수 있다는 단방향의 인과성이 나타났다. 그러므로 두 국가에서는 전력소비를 줄이는 정책이 경제성장에 부정적인 영향을 미치지 않으면서 시행될 수 있다.
Temporal Course Outcome of Seizure in Patients with Arteriovenous Malformations after Radiosurgery
유승훈,이정일,임도훈,남도현,김종수,홍승철 대한신경외과학회 2004 Journal of Korean neurosurgical society Vol.35 No.5
Objective : The purpose of this study is to assess the temporal course of seizure in patients with arteriovenous malformation(AVM) after radiosurgery. Methods : This study included 48 patients with AVM who underwent LINAC radiosurgery. Seventeen patients (35%) presented with seizure before the diagnosis of AVM. Clinical symptoms, location and volume of AVM, and temporal course of seizure after radiosurgery were analyzed retrospectively. Results : Among seventeen patients with seizure episode before radiosurgery, twelve(70.6%) improved progressively and one patient(5.9%) did not show change in seizure frequency during the follow up period. Transient increase of seizure frequency and subsequent improvement was observed in 4 patients(23.5%), and seizure was controlled in two of these patients during the follow-up. Cumulative seizure frequency of all patients increased transiently from six months to 18 months after radiosurgery, and then it began to decrease significantly. Conclusion : Radiosurgery is an effective treatment modality resulting not only in the obliteration of AVM but also improvement of epilepsy associated with AVM. However, in some patients, transient increase of seizure frequency was observed before subsequent improvement. It was around 18 months after radiosurgery that seizure frequency significantly decreased in the majority of the patients. These data suggest that there is a possibility of transient aggravation of epilepsy after radiosurgery even though epilepsy improved eventually in most of the patients.
국제 인적자원관리 전략의 결정요인과 성과- 한국내 외국인기업을 중심으로 -
유승훈,윤영득,김종관,김영근 대한경영학회 2003 大韓經營學會誌 Vol.16 No.7
An Empirical Analysis on Contingency Approach of Strategic International Human Resources Management Yu, Seung-Hoon*Yoon, Young-Deuk**Kim, Jong-Kwan***Kim, Young-Keun****This study explores how the tension between global integration and local responsiveness affects the dimensions and determinants of international human resource strategy. The effects of interorganizational interdependencies, competitive strategies and cultural differences, ownership on the two different dimensions of IHR strategy were studied using a sample of 53 MNCs subsidiaries operating in Korea.The findings for global integration suggest that when a subsidiary is highly dependent on the parent to provide crucial resources. And the findings for local responsiveness suggest that when a subsidiary is highly dependent on the host to provide crucial resources and institution.As for the hypothesized interaction shows a negative, significant relationship between a subsidiary's dependence on host institution and ownership and its localization(b=0.0211, p=0.05). Also between a subsidiary's dependence on host resource and ownership and its localization(b=-0.0113, p=0.1). Accordingly, these insights should prove to be useful to researchers and international human resource managers interested in the formulation and implementation of international human resource strategies.
유승훈,Kweon Oh Joo,Jung Sun-Young,백문성,김원영 대한중환자의학회 2023 Acute and Critical Care Vol.38 No.3
Background: Sepsis is characterized by heterogeneous immune responses that may evolve during the course of illness. This study identified inflammatory immune responses in septic patients receiving vitamin C, hydrocortisone, and thiamine.Methods: This was a single-center, post-hoc analysis of 95 patients with septic shock who received the vitamin C protocol. Blood samples were drawn on days 1–2, 3–4, and 6–8 after shock onset. Group-based multi-trajectory modeling was used to identify immune trajectory groups.Results: The median age was 78 years (interquartile range, 70–84 years), and 56% were male. Clustering analysis identified group 1 (n=41), which was characterized by lower interleukin (IL)-6, tumor necrosis factor (TNF)-α, and IL-10 levels, and these levels remained stationary or mildly increased until day 7. Conversely, group 2 (n=54) expressed initially higher IL-6, TNF-α, and IL-10 levels that decreased rapidly by day 4. There was a nonsignificant increase in lymphocyte count and a decrease in C-reactive protein level until day 7 in group 2. The intensive care unit mortality rate was significantly lower in group 2 (39.0% vs. 18.5%, P=0.03). Group 2 also had a significantly higher decrease in the mean (standard deviation) vasopressor dose (norepinephrine equivalent, –0.09±0.16 μg/kg/min vs. –0.23±0.31 μg/kg/min, P<0.001) and Sequential Organ Failure Assessment score (0±5 vs. –4±3, P=0.002) between days 1 and 4.Conclusions: There may be different subphenotypes in septic patients receiving the vitamin C protocol.