针对移动数据流量分载问题,提出在SDN架构下综合考虑基站成本和接入点消耗的网络服务成本最小化问题模型。针对基于对偶分解的流量分载算法在收敛速度和隐私安全方面存在的缺陷,提出基于近似雅可比交替方向乘子法（ADMM,alternating dir...针对移动数据流量分载问题,提出在SDN架构下综合考虑基站成本和接入点消耗的网络服务成本最小化问题模型。针对基于对偶分解的流量分载算法在收敛速度和隐私安全方面存在的缺陷,提出基于近似雅可比交替方向乘子法（ADMM,alternating direction method of multipliers）的流量分载算法,所设计的具体实施方案确保了隐私安全。同时,仿真实验表明基于近似雅可比ADMM的算法在收敛速度方面显著优于基于对偶分解的算法。展开更多
Disordered superconducting materials like NbTiN possess a high kinetic inductance fraction and an adjustable critical temperature, making them a good choice for low-temperature detectors. Their energy gap(D), critical...Disordered superconducting materials like NbTiN possess a high kinetic inductance fraction and an adjustable critical temperature, making them a good choice for low-temperature detectors. Their energy gap(D), critical temperature(T_(c)),and quasiparticle density of states(QDOS) distribution, however, deviate from the classical BCS theory due to the disorder effects. The Usadel equation, which takes account of elastic scattering, non-elastic scattering, and electro–phonon coupling,can be applied to explain and describe these deviations. This paper presents numerical simulations of the disorder effects based on the Usadel equation to investigate their effects on the △, Tc, QDOS distribution, and complex conductivity of the NbTiN film. Furthermore, NbTiN superconducting resonators with coplanar waveguide(CPW) structures are fabricated and characterized at different temperatures to validate our numerical simulations. The pair-breaking parameter α and the critical temperature in the pure state T_(c)^(P) of our NbTiN film are determined from the experimental results and numerical simulations. This study has significant implications for the development of low-temperature detectors made of disordered superconducting materials.展开更多
文摘针对移动数据流量分载问题,提出在SDN架构下综合考虑基站成本和接入点消耗的网络服务成本最小化问题模型。针对基于对偶分解的流量分载算法在收敛速度和隐私安全方面存在的缺陷,提出基于近似雅可比交替方向乘子法（ADMM,alternating direction method of multipliers）的流量分载算法,所设计的具体实施方案确保了隐私安全。同时,仿真实验表明基于近似雅可比ADMM的算法在收敛速度方面显著优于基于对偶分解的算法。
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11925304 and 12020101002)the Chinese Academy of Sciences Program(Grant No.GJJSTD20210002).
文摘Disordered superconducting materials like NbTiN possess a high kinetic inductance fraction and an adjustable critical temperature, making them a good choice for low-temperature detectors. Their energy gap(D), critical temperature(T_(c)),and quasiparticle density of states(QDOS) distribution, however, deviate from the classical BCS theory due to the disorder effects. The Usadel equation, which takes account of elastic scattering, non-elastic scattering, and electro–phonon coupling,can be applied to explain and describe these deviations. This paper presents numerical simulations of the disorder effects based on the Usadel equation to investigate their effects on the △, Tc, QDOS distribution, and complex conductivity of the NbTiN film. Furthermore, NbTiN superconducting resonators with coplanar waveguide(CPW) structures are fabricated and characterized at different temperatures to validate our numerical simulations. The pair-breaking parameter α and the critical temperature in the pure state T_(c)^(P) of our NbTiN film are determined from the experimental results and numerical simulations. This study has significant implications for the development of low-temperature detectors made of disordered superconducting materials.
