• Bulletin of the Korean Mathematical Society
• /
• v.33 no.2
• /
• pp.193-204
• /
• 1996

Let U and V be nonempty compact subsets of two Hausdorff topological vector spaces. Suppose that a function $J : U \times V \to R$ is such that for each $\upsilon \in V, J(\cdot, \upsilon)$ is lower semi-continuous and convex on U, and for each $ u \in U, J(u, \cdot)$ is upper semi-continuous and concave on V.

• Journal of the Korean institute of surface engineering
• /
• v.29 no.5
• /
• pp.454-458
• /
• 1996

The computer simulated CVD phase diagrams were completed by the stoichiometric algorithm. Three kinds of SiC/C FGMs: stepwise, semi-continuous, and continuous specimens were prepared according to the simulation. These three types of FGMs and SiC non-FGMs were compared through various thermal test and measurement. In overall judgment, the semi-continuously deposited FGM specimens out of three kinds showed excellent thermal properties as well as a good adhesion to each sub-layer.

• Communications of the Korean Mathematical Society
• /
• v.30 no.4
• /
• pp.493-504
• /
• 2015

The aim of this paper is to present some properties of sT-continuous functions. Moreover, we obtain a characterization and preserving theorems of semi-compact, S-closed and s-closed spaces.

• Nonlinear Functional Analysis and Applications
• /
• v.29 no.1
• /
• pp.15-33
• /
• 2024

In this article, we considered a class of nonlinear variational hemivariational inequality problems and investigated a gap function and regularized gap function for the problems. We discussed the global error bounds for such inequalities in terms of gap function and regularized gap functions by utilizing the Clarke generalized gradient, relaxed monotonicity, and relaxed Lipschitz continuous mappings. Finally, as applications, we addressed an application to non-stationary non-smooth semi-permeability problems.

• Journal of the Chungcheong Mathematical Society
• /
• v.6 no.1
• /
• pp.65-69
• /
• 1993

In this paper, we show that the module derivation D is continuous on the Banach algebra and the Silov algebra, and also that the derivation restricted by separating space and the radical on the semi prime Banach algebra is continuous.

• Journal of the Chungcheong Mathematical Society
• /
• v.21 no.2
• /
• pp.247-257
• /
• 2008

In this paper, we show that for a semi-shift the analytic spectral subspace coincides with the algebraic spectral subspace. Using this result, we have the following result. Let T be a decomposable operator on a Banach space ${\mathcal{X}}$ and let S be a semi-shift on a Banach space ${\mathcal{Y}}$. Then every linear operator ${\theta}:{\mathcal{X}}{\rightarrow}{\mathcal{Y}}$ with $S{\theta}={\theta}T$ is necessarily continuous.

• Journal of the Korea Institute of Military Science and Technology
• /
• v.6 no.1
• /
• pp.9-20
• /
• 2003

In this study, the performance of a semi-active suspension system for heavy duty tracked vehicles has been investigated. To this end, continuous and on-off Sky-Hook control law have been evaluated for a 1/4 car model. Simulation results show that the semi-active suspension system has potential to improve ride quality of the vehicle. And we proposed a method for improving of variable damper performance.

• Journal of Korean Society of Environmental Engineers
• /
• v.34 no.8
• /
• pp.523-527
• /
• 2012

This study was performed to determine optimum conditions of semi-continuous cultivation of chlorella sp. FC-21 cultivated under red light emitting diode (LED). Semi-continuous cultivation was conducted using red LED because red LED was found to be the best light source for chlorella sp. FC-21. During cultivation, phosphate and nitrogen were quickly diminished where cell concentration of chlorella was inversely proportional to the concentrations of phosphate and nitrogen in culture solution. To increase the period of dilution of culture solution, additional amounts of phosphate and nitrogen were inserted in the culture solution to increase the concentrations of phosphate and nitrogen. The cell concentrations of chlorella increased in the modified culture, but cell diameter was diminished as the dilution of culture was periodically conducted. When considered the cell concentration and cell diameter during the cultivation, amount of biomass produced was maintained constant.

• Transactions of the Korean Society of Mechanical Engineers B
• /
• v.22 no.12
• /
• pp.1763-1773
• /
• 1998

In the present experimental study, the flow behavior in a semi-closed two-phase natural circulation loop was examined. Water was used as the working fluid. Heat flux, heater-inlet subcooling, and flow restrictions at the heater-inlet and at the expansion-tank-line were taken as the controlling parameters Six circulation modes were identified by changing heat flux and inlet subcooling conditions ; single-phase continuous circulation, periodic circulation (A), two-phase continuous circulation, and periodic circulations (B), (C), and (D). Among these, the single-phase and two-phase continuous-circulation modes exhibit no significant oscillations and are considered to be stable. Periodic circulation (A) is characterized by the large amplitude two-phase f10w oscillations with the temporal single-phase circulation between them, while periodic circulation (B) featured by the flow oscillations with continuous boiling inside the heater section. Periodic circulation (C) appears to be the manometric oscillation with continuous boiling. Periodic circulation (D) has the longer period than periodic circulation (B) and a substantial amount of liquid flow back and forth through the expansion-tank-line periodically ; this mode is considered the pressure drop oscillation. Parametric study shows that the increases of the inlet- and expansion-tank-line- restrictions and the decrease of inlet subcooling broaden the range of the stable two-phase(continuous circulation) mode.

• Proceedings of the Korean Society for Technology of Plasticity Conference
• /
• 1997.06a
• /
• pp.148-159
• /
• 1997

In this study, microstructure, size of primary $\alpha$, solid fraction and hardness of A356 Al alloy, were investigated. Semi-solid A356 allos were obtained by semi-solid continuous casting apparatus consists of melting furnace, formation apparatus of granular primary $\alpha$ and continuous casting apparatus. Size of promary $\alpha$ and fraction solid were decreased with decreasing temperature, and with increasing volume of cooling water. At the cooling water temperature of 15$^{\circ}C$ and cooling water volume of 18.2$\ell$/min, the sizes of primary $\alpha$ phases were decreased up to 40${\mu}{\textrm}{m}$, and fraction solid was 0.68.