• 설비공학논문집
• /
• 제22권9호
• /
• pp.620-627
• /
• 2010

This paper presents a feasibility study of a fresh air load reduction system by using an underground double floor space. The fresh air is introduced into the double slab space and passes through the opening bored into the footing beam. The air is cooled by the heat exchange with the inside surface of the double slab space in summer, and heated in winter. This system not only reduces sensible heat load of the fresh air by heat exchange with earth but also reduces latent heat load of the fresh air by ad/de-sorption of underground double slab concrete. In this paper, we investigated the correlation between outdoor air temperature and outlet air temperature in the system. In conclusion, from the results of the high correlation we proposed a equation of regression for the outlet air temperature in the system by using linear regression analysis.

• 대한기계학회논문집
• /
• 제11권3호
• /
• pp.409-424
• /
• 1987

본 연구에서는 유한차분법보다는 정확도가 약간 떨어지지만 공기조화 분야의 계산에 적합하고 계산시간이 적게 소요되는 응답계수법을 사용하여 온수온돌방계의 비 정상 열전달을 해석하였다.

• 대한기계학회논문집B
• /
• 제28권7호
• /
• pp.809-817
• /
• 2004

In this paper, the unsteady behavior of the viscous flow field past an impulsively started elliptic cylinder is studied numerically. In order to analyze flow field, we introduce vortex particle method. The vorticity transport equation is solved by fractional step algorithm which splits into convection term and diffusion term. The convection term is calculated with Biot-Savart law, the no-through boundary condition is employed on solid boundaries. The diffusion term is modified based on the scheme of particle strength exchange. The particle redistributed scheme for general geometry is adapted. The flows around an elliptic cylinder are investigated for various attack angles at Reynolds number 200. The comparison between numerical results of present study and experimental data shows good agreements.

• 한국방사성폐기물학회:학술대회논문집
• /
• 한국방사성폐기물학회 2004년도 Proceedings of the 4th Korea-China Joint Workshop on Nuclear Waste Management
• /
• pp.1-11
• /
• 2004

PAN-4A composite ion exchanger was more selective for Sr ion than other cations and PAN-KCoFC composite ion exchanger has much higher ion exchange capacity for Cs ion than other cations. The ion exchange capacities obtained from Dubinin-Polanyi equation were 3.93 meq/g for Sr ion and 1.50 meq/g for Cs ion using PAN-4A and PAN-KCoFC ion exchangers, respectively. The modified Dubinin-Polanyi model fit the experimental data accurately in multi-component system. The effective surface diffusivities $(D_{s, cff})$ for Sr and Cs ions of PAN-4A and PAN-KCoFC ion exchangers were slightly increased with the different particle sizes.

• 한국자기학회지
• /
• 제10권2호
• /
• pp.86-92
• /
• 2000

자성 박막 표면에서의 일축 자기이방성을 고려한 자화의 경계조건을 Maxwell 방정식과 자화에 대한 Gilbert 방정식을 동시에 만족하는 해에 적용하여 자성박막에서 여기되는 스핀파 공명신호에 대한 모의실험을 수행하였다. 공명신호에 영향을 주는 물리량은 박막두께, 교환강성 상수, 표면 자기이방성 상수, 포화자화, 감쇠 상수, 전기비저항 등이며, 이러한 물리량들이 자성 박막에서 여기되는 스핀파 거동에 미치는 영향을 공명흡수선의 공명자기장, 선폭, 세기로 구분하여 조사하였다.

• Bulletin of the Korean Chemical Society
• /
• 제14권6호
• /
• pp.692-696
• /
• 1993

Prediction of retention times in transition metal-mandelate and transition metal-tartrate complex systems were studied on the cation exchanger. Plots of k' vs [mandelate] and k' vs [tartrate] were obtained under the condition of a constant competing cation concentration. The equation to predict the retention time of transition metal ion was derived from the ion exchange equilibria. Individual capacity factors (${k_1}',\;{k_2}'$) and stability constants ($K_1,\;K_2$) of the complexes were calculated from the non-linear least square method. Good resolution of the transition metals was predicted by the stepwise equation in the gradient method. The values of retention times from the calculation and the experiment agreed well each other.

• Bulletin of the Korean Chemical Society
• /
• 제20권11호
• /
• pp.1288-1294
• /
• 1999

We show that Shaw's optimized nonlocal model potential (OMP) in combination with the perturbative hyper-netted-chain equation for pair correlation functions can be successfully applied to predict pair structures of compressed and expanded liquid rubidium. For compressed rubidium, it is possible to apply the OMP to a state for which the model radius is even close to the Wigner-Seitz radius. In addition, our results are parallel to those from Chihara and Kahl's quantal hypernetted-chain equation in that it supports the uniform compression model up to 6.1 GPa. Calculation also shows that the pair structure is relatively insensitive to the choice of the exchange-correlation function for the electron liquid. Discussions are also given for compressed and expanded cesium.

• Journal of the Korean Society for Industrial and Applied Mathematics
• /
• 제25권3호
• /
• pp.93-106
• /
• 2021

In this paper, an efficient hybrid numerical method for solving two-asset option pricing problem is presented based on the Crank-Nicolson and the radial basis function methods. For this purpose, the two-asset Black-Scholes partial differential equation is considered. Also, the convergence of the proposed method are proved and implementation of the proposed hybrid method is specifically studied on Exchange and Call on maximum Rainbow options. In addition, this method is compared to the explicit finite difference method as the benchmark and the results show that the proposed method can achieve a noticeably higher accuracy than the benchmark method at a similar computational time. Furthermore, the stability of the proposed hybrid method is numerically proved by considering the effect of the time step size to the computational accuracy in solving these problems.

• Journal of East Asia Management
• /
• 제2권1호
• /
• pp.49-62
• /
• 2021

Multinational enterprises have adopted the form of business to successfully operate globally, and the overseas project has brought huge cultural exchange and penetration. The cultural liberalization also has improved the manufactured goods production and effect the consumers' purchase intentions. In this paper we focused on the influence factors that effected the cultural output, by investigating the actual consume market, using Structure Equation model(SEM model) to test the relationships among cultural preferences and purchase intentions of foreign products. Also, we evaluated the consumers' ethnocentrism's influences on cultural identity with other nations' cultural background. Lastly, we concluded that cultural identity has influences and complicate individual thoughts and purchase actions, it provides significance of impact of nation's soft power and whole economic development, and ethnocentrism has no significant influences on consuming foreign manufacture goods.

• 한국막학회:학술대회논문집
• /
• 한국막학회 2004년도 Proceedings of the second conference of aseanian membrane society
• /
• pp.109-112
• /
• 2004

The charged mosaic membranes having cation and anion exchange mixed groups within membrane were researched. The composite charged mosaic membrane was investigated from simultaneous transport such as solute and solvent flux. On the other hand, the reflection coefficient and salt flux coefficient were estimated by taking account of the cross constants of the phenomenological equation.(omitted)