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신현동(Hyundong SHIN),이영기(Youngki LEE),김희동(Heuydong KIM) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
When a shock wave arrives at an open end of tube, an impulse wave is discharged from the tube exit and<br/> causes serious noise and vibration problems. In the current study, the effect of the cross-sectional area of tube<br/> on the impulse wave is numerically investigated using a CFD method. The Harten.Yee’s total variation<br/> diminishing(TVD) scheme is used to solve the axisymmetric, two-dimensional, unsteady, compressible Euler<br/> equations. With three different cross-sectional areas of tube, the Mach number of the incident shock wave Ms<br/> is varied between 1.01 and 1.5. The results obtained show that the directivity and magnitude of impulse wave<br/> strongly depend upon the Mach number of incident shock wave and are influenced by the tube area. It is also<br/> known that the tube cross-sectional area significantly affects the magnitude of impulse wave at or near the<br/> tube axis.
Fakhar Zaman,Hyundong Shin(신현동) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
We propose a counterfectual protocol to implement a swap gate by using the chained quantum Zeno gate. We assume that remote parties have a untangled pair of quantum states. We demonstrate that our counterfactual swap gate protocol: i) enables remote parties to exchange one qubit of quantum information in each direction at the same time, ii) without using preshared entanglement, and iii) without transmitting any physical particle over the quantum channel.
관출구로부터 방출괴는 약한 충격파에 관한 3차원 수치해석
권용훈(Yonghun KWEON),신현동(Hyundong SHIN),김희동(Heuydong KIM),이동훈(Donghoon LEE) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
When a shock wave is discharged from the exit of a duct, complicated flow is formed near the duct exit.<br/> The flow field is much more complicated under the ground effects or any other objects near the exit of a duct,<br/> such as the circumstance near the exit of the high-speed railway tunnel. The resulting flow is essentially threedimensional<br/> unsteady with the effects of strong compressibility. In the current study, three-dimensional flow<br/> fields of the weak shock wave which is discharged from the exit of a duct are numerically investigated using a<br/> CFD method. Computations are performed for the weak shock wave in the range below 1.5. The results<br/> obtained show that the directivity and magnitude of the weak shock discharged strongly depend upon the<br/> Mach number of initial shock wave and are significantly influenced by the ground effects.