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FDI and Vertical Intra-Industry Trade between Korea and China
Kwangsuk Han,Jaeho Lee 한국경제연구학회 2012 Korea and the World Economy Vol.13 No.1
This study is to examine the impact of Korean firms’ FDI to China on the development of vertical intra-industry trade between two countries. The increase of Korean firms’ investment in China’s industry demonstrated strongly positive effect in the intensification of vertical intra-industry trade. Additionally, this study finds that the other components such as factor endowments as well as size of the industry in proportion to the total size of its economy are also important determinants of the development of vertical intra-industry trade between two countries.
East Asian Monetary Integration and the Composite Index of OCA Criteria
Kwangsuk Han,Yeonho Lee 한국경제연구학회 2010 Korea and the World Economy Vol.11 No.2
Since the 1997 Asian crisis and the commencement of the euro, renewed attention has been given to potential monetary integration in East Asia. After the 1997 crisis, many East Asian countries surrendered their pegs as they had no ability to sustain the peg exchange rate regimes. Therefore, the answers to the financial crisis could be an adoption of more flexible exchange rate regimes or a move to a hard fix such as a common currency. This study is differentiated from previous studies on OCA in East Asia in two respects. First, most previous studies focused on the evaluation with just a few criteria, which were too restrictive and potentially misleading. They also could not incorporate possible structural changes after the Asian crisis. As an alternative, this study covers more than ten OCA criteria, and extends the period that covers structural change after the Asian crisis. Second, this study proposes the Composite Index of OCA Criteria, which is the first trial in the study of OCA. Based on the Composite Index, we present a guideline for a step-by-step strategy to form a monetary union in East Asia. The results of our study suggest that relatively homogenous sub-groups - three Asian countries (Malaysia, Singapore and Hong Kong) or four countries (Malaysia, Singapore, Hong Kong and Taiwan) or six countries (Malaysia, Singapore, Hong Kong, Taiwan, Thailand, and Brunei) - could begin forming a monetary union, as a first step to form a common currency area.
Han, Seongsoo,You, Kwangsuk,Kim, Kwanho,Park, Jaikoo American Chemical Society 2019 Langmuir Vol.35 No.29
<P>The interaction forces between air bubbles and mineral surfaces were directly measured during the attachment process using an apparatus developed in our laboratory, and they are defined as the attachment forces. The attachment forces were measured between the air bubble and mineral surfaces modified with surfactants to have different hydrophobicities. Chalcopyrite and galena were used as the mineral surfaces, and their hydrophobicity was controlled by adsorbing xanthates with different hydrocarbon chain lengths. The hydrophobicity is represented by the static contact angle of water on the mineral surface. When the static contact angle was less than 90°, the attachment force increased considerably with increasing static contact angle of the surfaces, irrespective of the mineral type or the hydrocarbon chain length of the adsorbed xanthate. The hydrophobicity of the mineral surface is found to be the dominant factor determining the attachment force. The measured attachment forces agree well with those calculated based on the force balance model derived from the capillary force and Laplace pressure equation. Microflotation experiments to examine the relationship between the attachment force and flotation kinetics were carried out under the same conditions to control surface hydrophobicity. The variation in the flotation kinetic constants and attachment forces with the water contact angle are very similar. As a result, the attachment forces measured by the developed apparatus can provide quantitative information on the interaction between an air bubble and the mineral surface and can be used for predicting the flotation kinetics.</P> [FIG OMISSION]</BR>
Yeonho Lee,Kwangsuk Han 서울대학교 국제학연구소 2012 Journal of International and Area Studies Vol.19 No.1
This paper investigates the question of whether the stability of financial markets is damaged by foreigner's stock investment by estimating its dynamic relationships with stock price and exchange rate in East Asia, focusing on the 2007-2009 global financial crisis. We find that the negative effects of foreigner's stock investment on stock price and exchange rate are much stronger during a crisis than in normal times in many East Asian countries. This finding suggests that foreigner's stock investment could act as a destabilizing factor in domestic financial markets, especially in the face of global financial disturbances. In particular, the Korean exchange market is found to be most vulnerable to the global shocks among East Asian countries. As the impact of the global common shocks turns out to be very substantial in East Asian countries, policy makers should strengthen financial cooperation within this region. Increasing the intra-regional trades in stocks is expected to promote the financial stability in this region by providing opportunities for sharing investment risks among East Asian countries. In addition, regulatory measure such as the Tobin tax may be useful in limiting capital movements against a possible crisis.
Chee, Yongjoon,Han, Jooman,Youn, Jaewoong,Park, Kwangsuk IOP Pub 2005 PHYSIOLOGICAL MEASUREMENT Vol.26 No.4
<P>The cardio-respiratory signal is a fundamental vital sign used for assessment of a patient's status. Additionally, the cardio-respiratory signal provides a great deal of information to healthcare providers wishing to monitor healthy individuals. The air mattress sensor system allows the measurement of the respiration and heart beat movements without the use of a harness or sensor on the subject's body, which eliminates the difficulties these pose for long term measurements. In order to increase the sensitivity, a differential measurement technique between two air cells was used. The concept of a balancing tube between two air cells is suggested in order to increase the robustness against postural changes during the measurements. With this balancing tube, the meaningful frequency range could be selected using a pneumatic method. A mathematical model was constructed and validation experiments were performed for step and sinusoidal input signals. This technique was applied to measurements of respiration and heart beat movements in the supine posture on the bed, which showed potential for applications in sleep analysis, unconstrained healthcare monitoring and neonate monitoring.</P>