Multivariate filter banks with a polyphase matrix built by matrix factorization （lattice structure） were proposed to obtain orthonormal wavelet basis. On the basis of that, we propose a general method of constructin...Multivariate filter banks with a polyphase matrix built by matrix factorization （lattice structure） were proposed to obtain orthonormal wavelet basis. On the basis of that, we propose a general method of constructing filter banks which ensure second and third accuracy of its corresponding scaling function. In the last part, examples with second and third accuracy are given.展开更多
A novel double coupling planar structure(a single microstrip line coupled with two resonators coincidental)is presented for the first time.Based on this structure,a six-pole parallel-coupled high-temperature supercond...A novel double coupling planar structure(a single microstrip line coupled with two resonators coincidental)is presented for the first time.Based on this structure,a six-pole parallel-coupled high-temperature superconducting bandpass filter with both linear phase response and quasi-elliptic function response is designed.The filter has a 40 MHz passband with a center frequency of 2,000 MHz.Its dimension is18.67 mm 9 25.96 mm.At 77 K,minimum insertion loss is0.26 dB in passband.The group delay variation is\3 ns over70%of the filter bandwidth.展开更多
为实现交叉口时空资源的高效利用,对交叉口车道布局与信号控制协同优化问题进行了研究。首先,基于美国国家电气制造商协会(National Electric Manufacturers Association,NEMA)的双环标准相位,考虑饱和流量随车道数增加的递减效应,以信...为实现交叉口时空资源的高效利用,对交叉口车道布局与信号控制协同优化问题进行了研究。首先,基于美国国家电气制造商协会(National Electric Manufacturers Association,NEMA)的双环标准相位,考虑饱和流量随车道数增加的递减效应,以信号周期最小化为模型的目标,以车道布局、相位时长、饱和流量、交通流量、流量比、饱和度为模型的约束条件,建立了交叉口车道布局与信号控制方案协同优化的0-1混合整数线性规划(binary-mix-integer-linear-program,BMILP)模型。其次,使用分支定界法,快速得到模型的全局最优解。最后,选取南京市的北京东路-丹凤街交叉口,设定了3组不同的流量组合,对模型进行了实例验证。结果表明:模型可根据交叉口交通流量的分布特征,生成相应的车道布局和信号配时方案,无须预设特定的车道布局模式,且能灵活配置共享车道和右转相位;同时,对模型的最大可接受饱和度参数进行了敏感性分析,讨论了该参数和信号周期、相位饱和度等优化结果的关系。展开更多
基金Supported by Prof. Y.Xu under his grant in Program of "One Hundred Distinguished Chinese Scientists" of the Chinese Academy of Sciencesthe National Natural Science Foundation of China(No.10371122)Postgraduate Innovation Fund of the Chinese Academ
文摘Multivariate filter banks with a polyphase matrix built by matrix factorization （lattice structure） were proposed to obtain orthonormal wavelet basis. On the basis of that, we propose a general method of constructing filter banks which ensure second and third accuracy of its corresponding scaling function. In the last part, examples with second and third accuracy are given.
文摘A novel double coupling planar structure(a single microstrip line coupled with two resonators coincidental)is presented for the first time.Based on this structure,a six-pole parallel-coupled high-temperature superconducting bandpass filter with both linear phase response and quasi-elliptic function response is designed.The filter has a 40 MHz passband with a center frequency of 2,000 MHz.Its dimension is18.67 mm 9 25.96 mm.At 77 K,minimum insertion loss is0.26 dB in passband.The group delay variation is\3 ns over70%of the filter bandwidth.
文摘为实现交叉口时空资源的高效利用,对交叉口车道布局与信号控制协同优化问题进行了研究。首先,基于美国国家电气制造商协会(National Electric Manufacturers Association,NEMA)的双环标准相位,考虑饱和流量随车道数增加的递减效应,以信号周期最小化为模型的目标,以车道布局、相位时长、饱和流量、交通流量、流量比、饱和度为模型的约束条件,建立了交叉口车道布局与信号控制方案协同优化的0-1混合整数线性规划(binary-mix-integer-linear-program,BMILP)模型。其次,使用分支定界法,快速得到模型的全局最优解。最后,选取南京市的北京东路-丹凤街交叉口,设定了3组不同的流量组合,对模型进行了实例验证。结果表明:模型可根据交叉口交通流量的分布特征,生成相应的车道布局和信号配时方案,无须预设特定的车道布局模式,且能灵活配置共享车道和右转相位;同时,对模型的最大可接受饱和度参数进行了敏感性分析,讨论了该参数和信号周期、相位饱和度等优化结果的关系。
