色差의 三屬性 分解 (Ⅱ)

李鍾文,신영진,李達雨 全北大學校 1979 論文集 Vol.21 No.-

The fading behaviour of sorghum pigment may be expressed by the equation F(H_NBS)―~4.00(1-e^-0.2055^t) F(V_NBS)―~24.00(1-e^-0.2055^t) F(C_NBS)―~19.00(1-e^-0.2055^t) F(ΔE)―~30.87 (1-e^-0.2055^t) ―~√(F(H_NBS)^2+F(V_NBS)^2+F(C_NBS)^2) where t is the fading time(hr), and F(H_NBS), F(V_NBS), F(C_NBS), and F(ΔE) are the changes of color difference of Hue, Value, Chroma and ΔE due to light fading.

산성강하물이 지표수의 산성화에 미치는 영향 Ⅰ: 현장 조사

김영관,이동석,김만구,우경식 江原大學校 附設 環境硏究所 1997 環境硏究 Vol.14 No.-

Effects of acid deposition on the acidification of surface water over a short period were studied during June~October, 1995. A reservoir located in Chunchon, Kangwondo was selected for this study because this reservoir had received little man-made pollutants. Geological survey within the study area was carried out and the pH of a small and shallow stream flowing from the mountain valley down to the reservoir was monitored. Rainfall was measured by using a rain gauge and the precipitation was collected by automatic precipitation sampler. During the study period, rain pH was in the range of 3.81~5.77 with an average of 4.8. The EC was in the range of 8~189㎲/cm with an average of 10.6㎲/cm. Ionic composition of the rainfall showed that, of the anions, deposition of SO₄^(2-) was highest with 3,119.7 kg/㎢, and is was NH^(4+)with 1,053.2kg/㎢ for cations. The surface water pHs were maintained neutral or weak basic, representing little evidence of acidification regardless of the acidic rainfall pH. Every time of sampling, however, the pHs exhibited increasing tendency as elevation of measuring site of the stream become lowered, which indicated the impacts of acid-base reactions by acidic or basic substances during travel of water downstream. This result suggested the necessity of further research to determine the respective buffering capacity of soil and underlying rocks. 산성강하물이 단기간에 걸쳐 지표수의 산성화에 미치는 영향을 조사하기 위하여 1995년 6월 부터 10월까지 외부오염원이 거의 없는 강원도 춘천시에 위치한 저수지를 선정하여 인구를 수행하였다. 연구지역 일대의 지질을 조사하고 산골짜기에서 저수지로 흐르는 작고 얕은 하천의 수질을 분석하였다. 강우량은 우량계를 이용하여 측정하였고 강하물은 자동포집기를 이용하여 포집하였다. 연구기간동안의 강우의 pH범위는 3.81~5-77로 평균 4.8을 나타내었으며 전기전도도(EC)sms 5~189㎲/cm로 평균 10.6㎲/cm를 나타냈다. 음이온 중에서는 SO₄^(2-)의 강하량이 3,119.7kg/㎢로 가장 많았고, 양이온 중에서는 NH^(4+)가 1,053.2kg/㎢로 가장 많았다. 지표수의 pH는 중성 또는 약염기성으로 강우의 pH가 산성이었음에도 지표수의 산성화 현상은 관찰되지 않았다. 그러나 골짜기에서 흐르는 하천수를 측정할때마다 측정지점의 고도가 낮아질수록 pH값은 증가하는 경향을 나타내어 물이 하류로 흘러가는 동안에 일어난 산성 또는 염기성물질로 인한 산염기반응의 영향을 보여주었다. 이 결과는 토양의 완충능력과 모암내에서의 중화능력을 각각 구별하여 조사할 필요성을 제시하였다.

지방산, 지방 알코올 및 프로필렌글리콜이 클렌부테롤의 경피투과에 미치는 영향

이영대,권기철,정시영,이종달,용철순 영남대학교 약품개발연구소 2000 영남대학교 약품개발연구소 연구업적집 Vol.10 No.-

Clenbuterol, a selective β_(2)-adrenergic receptor stimulant, has been introduced as a potent bronchodilator for patients with bronchial asthma, chronic bronchitis and pulmonary emphysema. For the purpose of developing a transdermal preparation for clenbuterol, we attempted to select an optimal solvent system and permeation enhancer among fatty acids and fatty alcohols which are known to accelerate the penetration of various drugs in permeation experiments using hairless mouse skin and Franz diffusion cell. Apparent partition coefficient of clenbuterol was increased as pH of buffer solution was increased and solubility of clenbuterol was increased as the percent of propylene glycol(PG) in buffer solution(pH10) was increased. Permeability of clenbuterol from different buffer(pH 10)/PG solvent mixtures was decreased as the percent of PG in pH 10 buffer solution was increased and among the various enhancers studied, lauryl alcohol was found to be the most effective enhancer, increasing the permeability of clenbuterol approximately 76-fold compared with control. Lauryl alcobol(0-2%) enhanced the permeability of clenbuterol concentration-dependently. In this study, the optimal solvent system for the penetration of clenbuterol was found to be 50/50 buffer(pH 10)/PG solvent mixture containing 2% lauryl alcohol.

주파수 선택적 페이딩 채널에서의 다중반송파 CDMA의 다중채널 결합 검출 성능 분석

황용선,이종훈,김동구 延世大學校 電波通信共同硏究所 1999 電波通信論文誌 Vol.4 No.1

본 논문에서는 다중사용자/다중경로 환경에서 다중반송파 CDMA 시스템의 오류확률을 해석적으로 구하고, 다중사용자, 다중반송파, 다중경로에 의한 간섭의 영향을 분석하였다. 또한, 다중반송파 시스템에 역상관 검출기(decorrelating detector)를 결합한 다중반송파/다중사용자/다중경로 결합 검출 방식을 제시하고 성능 및 역상관 과정에 의한 백색가우시안 잡음(AWGN)의 증가를 분석하였다. 제안한 결합 검출 방식의 오류 확률은 사용자 한 명만이 존재하는 경우의 이상적인 성능에 근접하였다. In this paper, the bit error ratio(BER) performance of multi-carrier CDMA system in multi-user/multi-path environment is analytically derived, and effect of interferences due to multi-user, multi-carrier, multi-path is analyzed. A multi-carrier/multi-user/multi-path joint detection scheme incorporating a decorrelating detector is proposed, and its performance as well as the enhancement of noise due to decorrelating process are analyzed BER of the proposed joint detection scheme is only slightly degraded compared to the ideal case of single user environment.

Thermostable Adsorption Filter Immobilized with Super Activated Carbons by Quinoline Soluble Isotropic Pitch Binder (I-a Novel Adsorption Filter)

Yeong-Tae Park,Chul-Gyou Im,Yeong-Tae Kim,Bo-Sung Rhee 한국탄소학회 2009 Carbon Letters Vol.10 No.3

Among other filters such as light filter, wave filter, air filter, ultra filter and filter paper, a novel adsorption filter from thermostable polyester nonwoven fabrics immobilized with functional super activated carbon by means of quinoline soluble, activateable isotropic pitch binder were developed in this study. The activated carbon precursor is available in the market branded as coconut shell based activated carbon(CCS-AC) produced by Dongyang Carbon Co. Ltd. BET-surface area of this precursor was 1,355 m2/g, after KOH-activation it increased over 2,970 m2/g and was named as super activated carbon. In the preliminary research, this precursor was impregnated with PdCl2(0.188 wt%) KMnO4(3 wt%) and redox-agent(CuCl2, 0.577 wt%) in order to promote TOF up to 100/h and Selectivity up 99% and patented as a functional AC for the ethylene adsorption. The enhancement of the isotropic pitch binder to the AC-immobilized adsorption filter was BET-surface area upgraded by 266 m2/g and promoted the Iodine- and MB-adsorption by 1.4 times, respectively and also micro pore wide ranges 〈 5a~30 a 〉.

Comparison of Financial Integration Process between East Asia and Europe

( Yeong Seop Rhee ),( Hee Yul Chai ) 한국EU학회 2006 Asia-Pacific Journal of EU Studies Vol.4 No.2

This paper examines the financial integration process in East Asia. It also identifies its important features from a comparative perspective with Europe. Empirical analysis on stock markets utilizing a multivariate GARCH model shows that, while financial markets have become increasingly integrated in East Asia during the 1990s, financial integration is not accompanied by financial efficiency. This contrasts with the European case where financial integration is accompanied by financial efficiency. The most important reason behind this difference is the mismatch between real integration and financial integration. Simple integration through globalization is not sufficient, but deepening regionalism through various macroeconomic co-operations is essential for East Asia to reap the benefits from financial integration.

Demographic Change and Long Swings of Economic Trend in Korea

Rhee, Yeong-seop 淑明女子大學校 經濟經營硏究所 1997 經濟經營論集 Vol.27 No.-

This paper examines the effect of demographic change on macroeconomic variables at the micro level allowing for age-based population heterogeneity. The empirical results show that the change in age distribution has a significant explanatory power in consumption and current account equations, but not always in the interest rate equation.

A Non-parametric Test for Structural Change in Macroeconomic Variables by the Exchange Rate Regime Shift

Rhee, Yeong seop 淑明女子大學校 經濟經營硏究所 1994 經濟經營論集 Vol.23 No.-

The purpose of this paper is to empirically investigate whether or not there is a structural change in macroeconomic variables caused by the exchange rate regime shift. The results indicate that the exchane rate variablity is associated with the freedom of the float. However, the effect of the exchange rate regime on the behavior of other variables is not clear and varies across countries. Although there is a structural change in their behavior across exchange rate regimes, the change is not necessarily attributable to the regime shift occured in the beginning of 1970s.

Macroeconomic Stability Effect of Intermediate Exchange Rate Regimes: Target Zone vs. Managed Float

( Yeong Seop Rhee ) 한국EU학회 2010 Asia-Pacific Journal of EU Studies Vol.8 No.1

This paper compares alternative intermediate exchange rate regimes instead of comparing an extreme regime vs. an intermediate one, and investigates whether the stabilizing effect on the exchange rate of a regime can be extended to other economic variables. Central results from the comparison of two intervention rules between a target zone and a managed float are: if the sensitivity of aggregate demand to the real exchange rate is very large or the monetary disturbance is predominant compared to the real disturbance, then the stabilizing effect on the exchange rate of a tighter intervention in an intermediate regime than the other is positively associated with the stabilizing effect on the price; if the sensitivity of aggregate demand to the real exchange rate is very small or the real disturbance is predominant, the stabilizing effect on the exchange rate of a tighter intervention can be achieved only at the expense of price stability.

특집 : 유럽통합과 유럽금융구조의 변화

이영섭 ( Yeong Seop Rhee ),채희율 ( Hee Yul Chai ) 한국EU학회 2005 EU학연구 Vol.10 No.1