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정창영(Chang Young Chung) 한국국제경영학회 2001 國際經營硏究 Vol.12 No.1
This study empirically analyzed how Korean automobile companies are affected by, and how they strategically respond to exchange rate exchange rate changes. The result is rather surprising in that the stock prices and the export of the Korean automobile companies are more sensitive to yen-dollar exchange rate than to won-dollar exchange rate. One possible interpretation of this result is that not only a significant portion of Korean automobile companies` cash inflows but also cash outflows are denominated in U.S. dollars, so that exposure to won-dollar exchange rate risk is mitigated to a certain degree. The sensitivity to yen-dollar exchange rate risk, on the other hand, may be due to the keen competition with the Japanese automobile companies, and to that Japanese companies, as market leaders, strategically exploit the opportunity provided by favorable exchange rate changes. The share of Korean cars sold in the U.S. market has negative correlation with yen-dollar exchange rate, indicating that yen-dollar exchange rate significantly affects the competitive position of Korean automobile companies in the U.S. market. The negative correlation between the share in the U.S. market and won-dollar exchange rate is quite unexpected. One possible explanation of the result is that the insufficient differentiation capability hinders Korean companies from fully exploiting the favorable opportunities provided by exchange rate changes. No significant relationship could be found between selling prices and exchange rate changes
Characterization and Fabrication of Microcrystalline Si Thin Films Prepared by FA-CVD
정창영,정관수,장진,Cheong, Chang-Young,Chung, Kwan-Soo,Jang, Jin The Institute of Electronics and Information Engin 1990 전자공학회논문지 Vol.27 No.9
We studied the electrical, optical and structural properties of microcrystalline silicon thin films prepared by a new chemical vapour deposition technique, called filament assisted(FA)-CVD. The microcrystalline silicon is sucessfully deposited when the hydrogen dilution ratio exceeds 30. The Raman peak at 520 cm-1 and the X-ray diffraction peak at 27.7\ulcorner0.2\ulcornerbecome sharper with increasing hydrogen dilution ratio. We obtain high quality microcrystalline Si by FA-CVD with optical gap of \ulcorner2.2eV and hydrogen content of \ulcorner3 at %.
Foreign Exchange Exposure of Korean Manufacturing Firms
정창영(Chang Young Chung) 한국국제경영학회 1999 國際經營硏究 Vol.10 No.1
This study examines foreign exchange exposure of Korean manufacturing firms. The variation among firms in their exposure levels was explained with respect to the variation in the supposedly relevant firm specific characteristics. When the impact of exchange rate changes on the individual firms` stock returns is estimated in the multi-factor market model, 21 firms, 10% of the all firms in the sample, show significant(at 10%) exposure to won-dollar exchange rates while 10 firms, 5% of the sample firms, show significant exposure to yen-dollar exchange rates. It was hypothesized that a firm`s size, the proportion of exports to total sales, leverage ratio, and the proportion of foreign currency denominated debt out of total debt are the relevant firm specific characteristics for explaining the variation in the level of foreign exchange exposure among manufacturing firms. The regression models were estimated in the two subperiods, from January 1987 to December 1991, and from January 1992 to December 1996. The two subperiods differ in the degree of the capital market and foreign exchange market liberalization. The estimated results differ significantly between the two subperiods, and between the two exchange rates. The results indicate that some firm specific characteristics are significant in explaining the variation in the levels of foreign exchange exposure of individual firms. The discrepancies in the estimated coefficient structures between the two subperiods may represent any structural breaks. But some possible measurement problems necessitate further research for concrete conclusions.
임상연구 : Doxapram Hydrochloride가 후두마스크기도를 이용한 전 정맥마취 시 환기반응에 미치는 영향
윤영철 ( Young Chul Yoon ),곽상현 ( Sang Hyun Kwak ),정성태 ( Sung Tae Jeong ),김석재 ( Seok Jai Kim ),배홍범 ( Hong Beom Bae ),정성수 ( Sung Su Chung ),정창영 ( Chang Young Jeong ) 대한마취과학회 2007 Korean Journal of Anesthesiology Vol.53 No.4
Background: Intravenous anesthetics causes depression of ventilatory response to hypercapnea. Doxapram stimulates ventilation via peripheral and central chemoreceptors. This study was aimed to evaluate the effect of doxapram on ventilation during total intravenous anesthesia (TIVA). Methods: 60 patients undergoing operation under spontaneous ventilation via laryngeal mask airwaywere randomly divided into 3 groups: Control group received 5% dextrous infusion, D-2 group received doxapram injection of 1 mg/kg followed by continuous infusion of 2 mg/kg/hr, and D-4 group received doxapram injection of 2 mg/kg followed by continuous infusion of 4 mg/kg/hr. Anesthesia was induced and maintained with propofol and remifentanil. Respiratory rate, tidal volume (VT) and arterial carbon dioxide tension (PaCO2) were measured before and 15 min after induction of anesthesia, 0(15 min after start of operation), 1, 2, 3, 5, 15, 30, 45, and 60 min after start of doxapram infusion during TIVA. Results: VT was significantly increased 1 min after start of doxapram infusion and returned to the value of pre-doxapram infusion immediately. In D-4 group, VT was significantly (P<0.05) increased again 5 min after doxapram infusion compared with the value of pre-doxapram infusion and control group. PaCO2 was decreased 1 min after start of doxapram infusion and then increased again 2 min after doxapram infusion. In D-4 group, the degree of increase of PaCO2 was significantly (P<0.05) less than those of D-2 group. Conclusions: Doxapram injection of 2 mg/kg followed by continuous infusion of 4 mg/kg/hr improved the depression of ventilatory response during TIVA. (Korean J Anesthesiol 2007; 53: 470∼6)
임상연구 : Remifentanil과 Lidocaine이 Sevoflurane 마취유도 시 기관내삽관에 필요한 흡입시간에 미치는 영향
이재담 ( Jae Dam Lee ),정창영 ( Chang Young Jeong ),최정일 ( Jeong Il Choi ),이형곤 ( Hyung Gon Lee ),정성태 ( Sung Tae Chung ),김웅모 ( Woong Mo Kim ) 대한마취과학회 2008 Korean Journal of Anesthesiology Vol.55 No.5
Background: This study was conducted to investigate the optimal time interval for tracheal intubation and the effect of adjuvant drugs such as remifentanil and lidocaine during induction and tracheal intubation using sevoflurane inhalation without muscle relaxant. Methods: This study enrolled patients with the age of 20-60 years old and ASA 1 or 2. Patients were randomly assigned into one of 4 groups (S, SR, SRL, SL), in which they were given remifentanil (R) i.v. at a rate of 0.25 μg/kg/min, or lidocaine (L) i.v. bolus of 1.5 mg/kg during sevoflurane inhalation (S). Anesthesia was performed as inhalation induction 2 minutes after pre-filling with sevoflurane 8 vol%. The time interval between induction and tracheal intubation was determined using up-and-down method. When satisfied all of the categories of response to tracheal intubation, the case was assigned to `success`, otherwise `fail`. In each groups, effective time for successful intubation in 50% (ET50) and 95% (ET95) were calculated by probit analysis. Results: ET50 was 3.90 minutes (95% confidence interval 3.32-4.38) in group S, 3.18 minutes (2.92-3.48) in group SL, 2.83 minutes (2.47-3.07) in group SR, and 2.68 minutes (2.37-2.95) in group SRL. In group S, SL, SR, and SRL, ET95 was 4.52 minutes (4.17-7.95), 3.63 minutes (3.37-4.97), 3.30 minutes (3.06-4.64), and 3.12 minutes (2.89-4.42), respectively. Conclusions: The optimal time to intubate successfully using sevoflurane without muscle relaxant in 95% patients was 4.5 minutes. The optimal time is reduced to 3.1 minutes by coadministration of remifentanil and lidocaine. (Korean J Anesthesiol 2008;55:565~9)
백서의 척수강 내로 투여한 Metabotropic Glutamate 수용체 약물의 항침해효과 및 Morphine과의 상호작용
최정일 ( Jeong Il Choi ),이형곤 ( Hyung Kon Lee ),정성태 ( Sung Tae Chung ),김창모 ( Chang Mo Kim ),배홍범 ( Hong Beom Bae ),김석재 ( Seok Jai Kim ),윤명하 ( Myung Ha Yoon ),정성수 ( Sung Su Chung ),정창영 ( Chang Young Jeong ) 대한통증학회 2005 The Korean Journal of Pain Vol.18 No.1