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위상 감쇄 채널에서의 약한 측정 및 보정회전 기반 양자 고밀도 전송 프레임웍
홍준표(Junpyo Hong),이현수(Hyunsoo Lee) 대한산업공학회 2024 대한산업공학회지 Vol.50 No.3
Quantum dense coding is one of the important quantum computing techniques in communication. Quantum dense coding uses a small number of qubits for transmitions using the quantum entanglement state, which can deliver more classical bit data. However, during a transmission process, the coherence and quantum entanglement state may collapse owing to the influence of the embedding noise channel that a common quantum computing system has. This issue results in a decrease in the transmission capacity of quantum dense coding. Several techniques have been studied to reduce the influences of quantum noise channels. However, these research studies assumed limited quantum environment. This study proposes a new and effective framework to prevent the collapse of quantum entanglement states, focusing on a time-correlated phase damping channels. The quantum state is analyzed using quantum weak measurement (WM), and a correction rotation (CR) technique is integrated to restore it to its initial phase. The effectiveness of the proposed framework is demonstrated experimentally with the comparisons with existing quantum noise reduction techniques.
피스톤 홀 위치에 따른 록업 클러치 냉각유량에 관한 연구
홍준표(Junpyo Hong),김진문(Jinmoon Kim),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
New torque converter clutch works at low speed area for high fuel efficiency. This trend caused heat problem of friction material in lock-up clutch. Heat may cause the damage of friction material. Friction material. Friction material require cooling flow rate for guarantee of material life. In order to improve cooling, torque converter adapted the system by introducing the cooling hole in lock-up piston. However cooling hole causes torque drop because the oil flow for cooling lowers the pressure in the clutch piston. Torque converter designers should consider proper flow rate and torque for engine. Therefore the torque and hole size estimation is required for the early stage of torque converter design. Estimation equation was derived based on the physical background such as the centrifugal force, sudden expansion, sudden contraction and Bernoulli`s equation.