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서재현 연세대학교 동서문제연구원 2023 동서연구 Vol.35 No.1
This paper attempts to investigate if a significant increase in foreign asset purchases by domestic investors(i.e., a flight) is detrimental to emerging markets’ growth and investment using a panel data set that covers 56 emerging markets between 1990 and 2014. Furthermore, it studies the effect of a flight when it occurs simultaneously with a significant decrease in domestic asset purchases by foreign investors(i.e., a stop) using an interaction model. A key difference of our study is that we estimate this interaction effect using three generalized method of moments estimators(difference GMM, system GMM, and orthogonal deviation GMM) to address the causal effects rather than the associations between them. The results suggest that a flight alone is not harmful whereas simultaneous flights and stops could depress growth and investment. Therefore, the results of this paper complement the empirical evidence of the existing literature.
서재현 한국방송·미디어공학회 2020 한국방송공학회 학술발표대회 논문집 Vol.2020 No.7
○ 차세대 방송 기술 개발 5G와 방송망(ATSC 3.0) 연동 전송 기술 개발 ATSC 3.0 동일채널 중계기 개발 ○ 서비스 실증 계획(안) UHD 모바일/다채널 방송 서비스 지능형 교통 및 여행정보 서비스 ATSC 3.0 기반 소출력 방송 서비스 스케일러블 UHD 방송 서비스
Meteorological Conditions Related to the Onset of Idiopathic Sudden Sensorineural Hearing Loss
서재현,전은주,박용수,김준현,장기홍,여상원 연세대학교의과대학 2014 Yonsei medical journal Vol.55 No.6
Purpose: The objective of this study was to evaluate the effect of meteorological factors on the onset of idiopathic sudden sensorineural hearing loss (ISSHL). Materialsand Methods: Meteorological data from 2005 to 2011 were obtained from the web-based “Monthly Weather Reports of the Meteorological Administration” database. Patients with ISSHL who visited our hospital during this same period and presented the precise day on which hearing loss developed were included in this retrospective study. Twelve meteorological factors were analyzed between the days when ISSHL onset was observed as well as the days when ISSHL did not occur. The weather conditions occurring 1‒7 days before ISSHL onset were also analyzedto assess any possible delayed effects of meteorological factors on the onset of ISSHL. Results: During the study period, 607 patients were included for the study. Although mean and maximal wind velocities were higher for the days when ISSHL occurred than the days without ISSHL onset, after adjusting the value for multiple comparisons, we cannot find any significant relationship between any of meteorological factors and the onset of ISSHL. However, in analysis of time lag effect of the weather conditions, we found that there was still a significant differencein maximum wind speed on 5 days before ISSHL onset even after applying Bonferroni correction. Conclusion: The result of this study suggests that stronger wind speed may be related to the occurrence of ISSHL.
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서재현 계명대학교 사회과학연구소 2023 한국사회과학연구 Vol.42 No.2
Financial market liberalization has allowed many emerging market economies to access global financial resources with reasonable risk premiums. Contrarily, recklessly opened markets have caused excess surges and flights of capital flows and, as a consequence, bubbles were created in the domestic markets and the probability of financial crises sharply increased. These contradicting effects of financial openness motivated many researchers to argue the necessity of capital controls(CCs) and theoretical frameworks built by them supported their arguments. However, empirical evidence on the effects of CCs are still inconclusive and this motivated us to discuss the reasons why this seemingly simple question is still unanswered. We suggest three limitations on estimating the effects of CCs that are especially prevalent in panel studies. They are 1) endogeneity, 2) inaccurate measures of CCs, and 3) heavy dependence on experiences from developing countries. We also provide some examples that tried to overcome or detour these limitations.