Earticle

We have investigated binding between wild-type and mutant Heat Shock Factor (HSF) DNA binding domains (DBDs) with 17-bp HSE containing a central 5'-NGAAN-3' element by equilibrium analytical ultracentrifugation using multi-wavelength technique. Our results indicate that R102 plays critical role in HSE recognition and the interactions are characterized by substantial negative changes of enthalpy (${\Delta}H^0_{\theta}=-9.90{\pm}1.13kcal\;mol^{-1}$) and entropy (${\Delta}S^0_{\theta}=-12.46{\pm}3.77cal\;mol^{-1}K^{-1}$) with free energy change, ${\Delta}G^0_{\theta}$ of $-6.15{\pm}0.03kcal\;mol^{-1}$. N105 plays minor role in the HSE interactions with ${\Delta}H^0_{\theta}$ of $-2.54{\pm}1.65kcal\;mol^{-1}$, ${\Delta}S^0_{\theta}$ of $19.28{\pm}5.50cal\;mol^{-1}K^{-1}$ and ${\Delta}G^0_{\theta}$ of $-8.35{\pm}0.05kcal\;mol^{-1}$, which are similar to those observed for wild-type DBD:HSE interactions (${\Delta}H^0_{\theta}=-3.31{\pm}1.86kcal\;mol^{-1}$, ${\Delta}S^0_{\theta}=17.38{\pm}6.20cal\;mol^{-1}K^{-1}$ and ${\Delta}G^0_{\theta}=-8.55{\pm}0.06kcal\;mol^{-1}$) indicating higher entropy contribution for both wild-type and N105A DBD bindings to the HSE.

최근 서울의 각 지하철역에서의 라돈농도 측정결과가 각 일간지 및 방송에 보도되면서 서울시의회업무 보고 및 국정감사에서도 중요한 이슈의 하나로 부각되었다. 라돈에 관한 미환경청(USEPA)의 규제치(action level)는 4pCi/L이며 이때의 방사평형인자는 0.5로 되어있다. 서울시에서는 2000년도에 195개소 즉 175개역사와 20개소의 환승통로에 대한 라돈농도에 대한 장단기농도 측정과 1999년도에는 라돈자핵종을 분석하여 이를 바탕으로 라돈방사평형인자를 구한바 있다. (중략)

The aim of this study is to investigate the existence of general equilibrium in international trade between Korea and China by evaluating factor price equalization (FPE). This is because Heckscher-Ohlin suggests that the FPE might be a general equilibrium in international trade, and once it is attained, both countries which are engaged in international trade would maximize their gains. China is a good example for this purpose due to the fact that its factor price intensity could be altered from labor to capital since 1980s. Empirical evidences revealed that the FPE exists in the short run, but not in the long run between these countries. However, the results which are obtained by rolling regression shown that the FPE would be evaluated since mid-2000s even in the long run. Furthermore, the factor price intensity has not been altered between these countries. Therefore, it could be concluded that industrial policy to support technical improvement or a capital-oriented production system has to be received with more concern rather than a commercial policy.

The large planar failure has occurred in a rock cut slope of highway construction site in Boeun. This area is considered as unstable since the discontinuities whose orientations are similar to the orientation of the failure plane, are observed in many areas. Therefore, several analysis techniques such as SMR, stereographic analysis, limit equilibrium, numerical analysis, which are commonly used in rock slope stability analysis, are adopted in this area. In order to analyze the stress redistribution and nonlinear displacement caused by cut, which are not obtained in limit equilibrium method, the UDEC and shear strength reduction technique were used in this study Then the factors of safety evaluated by shear strength reduction technique and limit equilibrium were compared. In addition, the factor of safety under fully saturated slope condition was calculated and subsequently, the effect of the reinforcement was evaluated.

전력산업의 시장구조는 과점형태의 불완전 경쟁의 구조로 해석하는 것이 일반적이다. 또한 전기의 물리적 특성상 송전선로에서는 전력손실이 발생하게 되는데, 본 논문은 과점시장 모델로서 쿠르노(Cournot)모델을 사용하여 손실을 포함한 내쉬 균형점을 해석한다. 지역별 한계가격(Locational Marginal Price ; LMP)와는 달리 계통한계가격(System Marginal Price ; SMP)는 손실에 대한 가격신호를 시장에 반영하기 어렵기 때문에 손실과 함께 한계송전손실계수(Marginal Loss Factor ; MLF)를 적용하여 균형상태의 시장거래가치를 비교분석한다.