일본인의 한국관광수요 변동성

모수원,박석호 국제무역학회 2004 국제무역연구 Vol.10 No.1

본고는 예상하지 못한 뉴스충격이 방한객의 변동성에 미치는 영향이 비대칭임을 밝힘과 더불어 변동성을 가장 정확히 추정하고 예측할 수 있는 모형을 설정하고 선택하는 데 목적을 둔다. 이를 위해 4가지 GARCH모형, EGARCH모형, AGARCH모형, GJR모형에 대해 부호편의검정과 규모편의검정을 실시하여 모형의 설정오류를 조사한 후, GARCH모형은 비대칭모형에 비해 나쁜 뉴스에 대해서는 과소평가를, 좋은 뉴스에 대해서는 과대평가를 하는 경향이 있음을 보인다 또한 EGARCH모형의 조건부 분산은 나쁜뉴스에 대해 비합리적일 정도로 기이하게 높게 나타나 방한객의 조건부분산을 설명하는데 적합하지 못하며, AGARCH모형은 GARCH모형에 비해 나쁜 뉴스를 오히려 과소평가하는 것으로 나타나 GJR모형이 예측에 적합한 모형임을 밝힌다. ln recent years the evidence of predictability has led to a variety of approaches, because the GARCH model cannot capture some important features of the data. The most interesting of these approaches are the asymmetric or leverage volatility models, in which good news and bad news have different impact on volatility. Hence, this paper introduces the models capturing such asymmetric effect, which includes the EGARCH, AGARCH, and GJR models. The asymmetric models found that negative shocks introduced more volatility than positive shocks. The EGARCH model, however, returns unreasonably large conditional variance for large negative shocks. Futhermore, the AGARCH model underestimated the variance for the bad news relative to the GARCH model. This paper, therefore, shows that the GJR model is not only the best at capturing the asymmetric effect, but useful approach to modeling conditional heteroscedasticity.

'예수님의 이름'을 부르는 기도 : Its History and Meanings

안석모 연세대학교 신과대학 2004 신학논단 Vol.37 No.-

교감신경자극시 Norepinephrine에 대한 신혈관 반응에 변화

이석호,민영기,양훈모 순천향의학연구소 2002 Journal of Soonchunhyang Medical Science Vol.8 No.1

To determine to effect of angiotensin Ⅱ(ANG Ⅱ)-induced hypertension on the renovarcular respones to norepinephrine (NE), six anesthetized dogs instrumented for monitoring of renal blood flow (RBF) were subjected to step increases every 2 minutes in the rate of norepinephrine infusion into the renal artery during 1) control condition(C), 2) servocontrol of renal arterial pressure (RAP) at levels expected to be achieved during acute captopril administration(C+S), 3) acute captopril administration(CEI), 4) angiotensin Ⅱ infusion simultaneously with captopril at concentrations which restored RAP toward control (CEI+A), and 5) servocontrol of RAP during captopril and angiotensin Ⅱ (SEI+A+S). Whether the plasma levels of ANG Ⅱ were allowed to increase(C, C+S) or not (CEI+A, CEI+A+S) with NE infusion, there were no differences in RBF respones to NE infusion between C and C+S and between CEI+A and CEI+A+S, which implies that RAP does not play an important role in modulating the renovascular response to NE. However, when captopril was administered without ANG Ⅱ replacement (CEI), RBF induced severe renal ischemia at much lower rates of NE infusion than occurred when the sufficient concentration of ANG Ⅱ were present in the plasma. Since this enhanced sensitivity to NE did not occur at RAP's lower than those achieved during acute captopril administration once ANG Ⅱ was present in the plasma in sufficient concentrations, it is likely that ANG Ⅱ exerts a protective effect on the kidney during renal adrenergic stimulation through a mechanism other than increasing systemic arterial pressure.

工業敎育大學의 實驗實習施設 共同活用 및 運營에 關한 硏究

尹錫天,牟相榮,權五憲,千炳善,周赫鍾,李永臣,金健中,羅聲雄,洪錫雨,吳德成,盧泰天 충남대학교 공업교육연구소 1983 論文集 Vol.6 No.2(A)

The College of Engineering was specialized to have a sole function for supplying technical high school teachers in 1977 and referred to as the College of Industrial Education according to the Government's policy. The economic impact mainly due to the oil-crises caused a severe problem to this college, namely discrepancy of supply to demand scale. Accordingly the number of student enrollment was to be fluctuated from 479 in 1979 through 800 in 1979 and 900 in 1980 to 430 in 1981. And the engineering departments have been attached to this Engineering Education College since 1981. These circumstanses met singnificant inefficiency in facility operation. This program aims at providing an overall relocation of the college facilities and preparing the practical system to make the joint-operation possible taking into account circulation, academic stream, budget, maintenance, etc. However this study could not get optimal spacing but some trade-off, considering the current situation.

일측 하퇴 의족 착용자의 절단단 길이에 따른 보행특성

조병모,변주남,김기순,김석산,박종 조선대학교 부설 의학연구소 1999 The Medical Journal of Chosun University Vol.24 No.1

This report studied 31 male patients who were in one hospital in Kwangju or came to a prosthesis clinic and are 15 normal control group to analyze the gait characteristics according to the stump length in the prosthesis users with the unilateral below-knee amputations. The patient group was divided into a short stump subgroup of 13 patients and a long stump subgroup of 18 patients according to the stump length, the control group was randomly sampled from 15 males who have similar age, height and weight to the experimental group. The results of analysis are summarized as follows. 1. There were no significant statistical differences of the general characteristics between patient and control groups and there was no difference of characteristics by patient groups except the mean gait distance a day. 2. Of 33 patients with amputation, 18 patients (57.8%) had phantom pain and 25 cases (80.6%) had neuroma. 3. Gait velocity, stride length of the affected side, step length of the sound side and base support among gait characteristics show a significant difference according to the stump length in the state excluding the effects of other factors (p<05) and the group with long stump showed closer gait characteristics to normal persons than those with short stumps. In conclusion, among the patients of unilateral below-knee amputations, the stump length affects the gait characteristics such as gait velocity, stride length, step and base of support and it is found that as the stump length gets longer, it shows the similar characteristics to gait characteristics of normal persons and long unilateral below-knee amputation can secure better gait characteristics.

엔지오텐신이 Norepinephrine의 신혈관 반응에 미치는 영향

이석호,김종규,양훈모,민영기,임한혁 순천향의학연구소 1999 Journal of Soonchunhyang Medical Science Vol.5 No.2

To determine the effect of angiotensin Ⅱ(ANG Ⅱ)-induced hypertension on the renal hemodynamic response of norepinephrine(NE), mongrel dog instrumented for checking of renal blood flow(RBF) was followed as the step increases every 2 minutes in the rate of norepinephrine infusion into the renal artery during 5 conditions (C : control, C+PD : control+pressure decompression of aorta, ACEI : angiotensin converting enzyme inhibitor, ACEI+ANG Ⅱ : angiotensin converting enzyme inhibitor+ANG Ⅱ, ACEI+ANG Ⅱ+PD : angiotensin converting enzyme inhibitor+ANG Ⅱ+pressure decompression of aorta) Without relation of increase (C, C+PD) or decrease (ACEI+ANG Ⅱ, ACEI+ANG Ⅱ+PD) of the plasma ANG Ⅱ level when NE is infused into vessel, there were no differences in RBF response to NE infusion between C and C+PD and between ACEI+ANG Ⅱ and ACEI+ANG Ⅱ+PD, which implies that renal arterial pressure(RAP) does not play an important role in controling the renal hemodynamic response to NE. When renin angiotensin system was blocked by captopril without adding to ANG Ⅱ supply (ACEI), RBF can be severe decreased to approximately 90% at much lower rates of NE infusion than occurred when the sufficient concentration of ANG Ⅱ were present in the plasma. As the increased sensitivity of NE did not occur at lower renal arterial pressure, when ANGⅡ was present in the plasma in sufficient concentrations, it seems that protective effect on renal function is possible by ANGⅡ during renal sympathetic stimulation.

L - NAME 주입시 신 교감신경이 신혈류량 변화에 미치는 영향

민영기,양훈모,이석호,김종규 순천향의학연구소 2000 Journal of Soonchunhyang Medical Science Vol.6 No.2

Recently it is known renal medullar will be play a important role of blood pressure control and pressure natriuresis. Renomedullary antihypertensive mechanism is activated by increasing perfusion pressure of kidney and can be inhibited by sympathetic nerve stimulation or blockade of nitric oxide(NO) formation. It is important to know what is affect on renal regional blood flow, especially renal medullary blood flow(MBF). For the purpose of investigating the effect of the renal sympathetic nerve on regional blood flow during infusion of blocking NO synthesis(by N^(ω)-nitro-L-arginine methylester:L-NAME) in spontaneous hypertensive rat(SHR) and Wistar rats normal control, Mean arterial pressure(MAP), total renal blood flow(TRBF), midcortical blood flow(CBF), inner medullary blood flow were measured in innervated or denervated renal sympathetic nerve group of SHR and Wister rats. All group that received the L-NAME were seen increasing MAP while TRBF, CBF and MBF decreased and the decrease of TRBF in SHR is more marked than in Wistar rat. In spite of increasing the MAP, MBF in all four group decreased, respectively C: 220 ± 3 U, 205 ± 2 U Wi : 215 ± 4 U, 165 ± 12 U Wd :218 ± 3 U, 170 ± 10 U Si :195 ± 4 U, 98 ± 15 U Sd : 200 ± 3 U, 120 ± 14 U, especially the most remarkable decrease about 50 % in SHR innervated group. Thus, according to these result, NO seems to maintain the MBF and the partial interaction between renal sympathetic nerve and NO in medullary blood flow can be suggested in innervated SHR.

enalapril의 혈압하강효과에 대한 renomedullary depressor system의 역할

민영기,양훈모,김종규,이석호 순천향의학연구소;Soonchunhyang Medical Research Institute 2000 Journal of Soonchunhyang Medical Science Vol.6 No.1

It has long been recognised that renin-angiotensin system(RAS) takes part in blood pressure control. It was previously known that the physiological effects of the renomedullary depressor mechanism are in virtually all aspects the very opposite of those of RAS. Muirhead proposed that there was a negative-feedback interaction between two systems, RAS and renomedullary antihypertensive depressor system, and they balance each other. If true, as the suppression of angiotensin Ⅱ(ANG Ⅱ)by angiotensin converting enzyme(ACE) inhibitor activates the renomedullary antihypertensive function, we can assume the blood pressure lowering effects of ACE inhibitor due to an increased secretion of medullary depressor substance. After rats with intact and chemically destroyed renal medulla received either saline or the ACE inhibitor, mean arterial pressure(MAP) was clearly decreased after ACE inhibitor administration in controls with intact medulla, but MAP in rats with chemically destroyed renal medullar was not changed. According to these results, we can come to a conclusion that renomedullary depressor substance plays an important role to normal blood pressure control.

洛東江 河口海城의 식물플랑크톤 極大城 變動에 관한 數値시뮬레이션 : 1. 식물플랑크톤 극대역 변동 현황 1. The state of variation of phytoplankton maximum region

이대인,홍석진,이석모,박청길 한국환경과학회 2000 한국환경과학회지 Vol.9 No.5

The estuary of Nakdong river is very influenced by the freshwater contained nutrients and organic materials. The response results of these influences are eutrophication and red tide outbreak in this region. Concentration of chlorophyll a was 0.78∼62.55㎍/L in February, 1.20∼21.29㎍/L in April, 1.88∼188.35㎍/L in June, and 0.78∼11.21㎍/L in August, respectively. The decrease of chlorophyll a is considered that residence time is shorten by increase of freshwater discharge, and unfavorable growth condition of phytoplankton is created by diffusion of low salinity and increase of turbidity. The phytoplankton maximum region located inner side of this estuary during winter season, whereas it was moved to outer side when mean discharge of the Nakdong river was increased. Therefore, the variation of phytoplankton maximum region was affected by input discharge from the Nakdong river basin.

電氣相似模型에 依한 흙속의 浸透流 解析

權武男,具賢謨,李相昊,李錫健 慶北大學校 1989 論文集 Vol.47 No.-

This study was performed to evaluate the usefulness of the electrical analogue model in porous medium. Experimental values by the electrical analogue models were compared with those by the sand models and theoretical values by the fragment method. The results obtained are as follows: 1. The flow lines into the sand model were changed according to rising the upstream water level but those of the electrical analogue model weren't changed, and the equipotential lines were revealed to be almost same in the two kinds of models above. 2. The seepage quantities by the fragment method and the electrical analogue model were a little more than those by the sand model. 3. The exit gradients by the fragment method were steeper than those by the sand model and the electrical analogue model. 4. The seepage quantities were increased in proportion to the increment of the exit gradients. By means of the results above, it may be given as a conclusion that the electrical analogue model test is more useful than the sand model test for appling to seepage flow in the field condition, because the electrical analogue model test is more accurate and simpler. Then, the electrical analogue model test will be able to apply to the three-dimension seepage flow problems.