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Kihyung Song Korean Chemical Society 1991 Bulletin of the Korean Chemical Society Vol.12 No.5
In this paper, the question whether the curvature of the minimum energy path can affect the dynamic threshold was tested using the boundary trajectory method developed by Chesnavich and coworkers. For nonreactive system, the MO EXP model potential surface was used with modified equilibrium distance to control the curvature. The results showed that there is no relation between the curvature and the dynamic threshold. In order to study the reactive system, a generalization of the boundary trajectory method was achieved to apply on the nonsymmetric system. We have found no correspondence between the curvature and the dynamic threshold of the system. It was also shown that the fate of the trajectories strongly depends on the shape of potential surface around the turning points along the symmetric stretch line.
The Analysis of Thermal Characteristics of Prototype Ondol Structures in Korean Apartment Houses
Kihyung Yu,Dongwoo Cho 국제온돌학회 2010 International Journal of Ondol Vol.2010 No.-
As the Inter-floor Thermal Insulation Regulation of apartment house applies, in this study, indoor thermal performance and downward heat loss between the cases when insulation exists and doesn t exist change in the thickness of the structure slab under the inter-floor noise isolation standard, and thermal characteristic of typical floor structure will be compared and analyzed through simulation. And the resultant information will be provided as the basic data for designing Ondol heating design suitable for the property of apartment houses in Korea. As the Inter-floor Thermal Insulation Regulation applies since 2001, upward thermal performance was found to increase by 2~3% but downward heat loss decrease by approx. 30% or more representing that remarkable portion of downward heat loss is reduced. As result of comparing five prototype floor structures, upward thermal performance of the standard floor structure was found to be 70~71 W/㎡ while downward heat loss was, in the case of prototype floor structure, 10~11 W/㎡. As result of simulating the change in thermal performance as per the height of hot water supply pipes, it was found that upward thermal performance increases as the height of pipe gets higher. On the other hand, the difference of temperature between the place right above the pipe and the in-between place gets larger, which implies that thermal performance and difference of hot water temperature should be taken into account in the design of Ondol structure. The difference of upward thermal performances according to the height of pipe and downward heat losses were found to be approx. 10.8% and 5.81% respectively. The thermal performance information in prototype floor structure suggested in this study will be used for the basic data for the design of Ondol heating design.
이기형(Kihyung Lee),김용래(Yonglae Kim),배재일(Jaeil Bae) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, the international regulations about the exhaust emission of the motorcycle have been strengthened. In case of the motorcycle engines, the quantity of the exhaust emission is larger than that of the car because of the carburetor type fuel supply system, which can not control the A/F precisely. Therefore, the electrically controlled fuel injection type motorcycle has been emphasized to meet with this regulation. However, since the pulsation phenomenon happens in the intake port of the motorcycle because of the characteristic of high speed and the smaller layout than the passenger car driving condition, there are many difficulties to select the factor about control parameters needed to develop the ECU system. For addition, an air flow rate is the important basis parameter at the ECU system. In this paper, the pulsation values measured from the engine test were compared with the calculated value by WAVE, and we analyzed the intake pressure characteristic according to the driving condition. Finally, an air flow rate is estimated by simulation method.