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Trench Formation on Ion Implanted SiC Surfaces after Thermal Oxidation
Bahng, Wook,Song, Geun Ho,Kim, Nam Kyun,Kim, Sang Cheol,Kim, Hyoung Wook,Seo, K.S.,Kim, Eun Dong Trans Tech Publications, Ltd. 2005 Materials science forum Vol.483 No.-
<P>The effects of the damage induced during ion implantation on the surface roughening and oxide growth rate were investigated. Using several scheme of doses and acceleration energies, it is found that the amount of the dose predominantly produce damage rather than the acceleration energy, especially near the surface region. It was also found that the damage affects not only the oxide growth rate but also the surface roughening during high temperature annealing. The edge of highly implanted area may have higher doping concentration due to the vicinal side wall effect of the thick oxide mask for ion implantation. It was confirmed by the trench formation after thermal oxide remove.</P>
Bahng, Wook,Cheong, Hui Jong,Kang, In Ho,Kim, Seong Jin,Kim, Sang Cheol,Joo, Sung Jae,Kim, Nam Kyun Trans Tech Publications, Ltd. 2007 Materials science forum Vol.556 No.-
<P>We have investigated the influence of surface modification on the electrical properties of SiC diodes. Schottky diodes (SBDs) as well as PiN diodes were fabricated on n-type SiC substrate with an epilayer, and electrically characterized before and after high temperature annealing, and after removing the surface modified layer, respectively. The devices annealed without graphite cap layer showed ohmic behavior. The surface layer was modified to a conductive layer possibly due to the preferred sublimation of Si species. In order to confirm the existence of modified surface conductive layer, diode was fabricated on the same substrate and electrically characterized after removing 30nm-thick damaged layer by ICP-RIE. The leakage current reduced dramatically, as much as 7 orders of magnitude. The PiN diodes fabricated on the damaged surface layer showed the reverse leakage current and the breakdown voltage of 50mA and 1250V, respectively. While those of the diode fabricated after removing the damaged surface layer were 200nA at the breakdown voltage of 2100V, respectively.</P>
INTERACTIONS OF STOCK MARKETS WITHIN THE GREATER CHINA ECONOMIC BLOC
Bahng, Seung-Wook,Shin, Seung-Myo 연세대학교 동서문제연구원 2004 Global economic review Vol.33 No.3
This paper investigates what types of mutual relationships exist among the stock markets of the Greater China economic bloc, which include stock markets in Hong Kong and Taiwan, as well as stock markets in Shanghai and Shenzhen. Using the unit root test, co-integration analysis, and vector error correction model (VECM), this paper analyzes interrelationships among daily stock indices for the period from the beginning of 1992 to the end of 2001. Test results indicate the existence of one co-integrating vector, implying that a long-run equilibrium relationship holds among the four stock indices. Variance decomposition of forecast errors provides evidence that the Shenzhen stock market is the market most heavily influenced by the unexpected variations of other markets in the Greater China economic bloc.
방승욱(Seung Wook Bahng) 한국경영학회 1996 經營學硏究 Vol.25 No.2
As a modification of Morck, Shleifer, Vishny(1988), this research writing focuses on how ownership structure of Korean firms affects market valuation. In dealing with the research topic, this article introduces the concept of switching regression, and derives a special form with unknown changing points, thus differentiating itself from the referenced articles of identical research category. The analytical derivation is empirically applied, by using RATS program, to the relationship between ownership structure and market valuation in order to test both the convergence of interest hypothesis and the entrenchment hypothesis. Specifically speaking, the hypotheses include whether the linear relationship of the two variables differs at some intervals of ownership site, whether affiliation of firms affects relationship pattern of the variables and whether the linear relationship differs from year to year. The produced results indicate some evidences inconsistent with those of previous studies.