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Filterbank implementation for multi-channel sampling in fractional Fourier domain

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Science China(Technological Sciences) 2009年第9期52卷 2619-2628页

作者： ZHANG Feng tao ran WANG Yue Department of Electronic Engineering Beijing Institute of TechnologyBeijing100081China

Reconstruction of a continuous time signal from its periodic nonuniform samples and multi-channel samples is fundamental for multi-channel parallel A/D and MIMO systems. In this paper,with a filterbank interpretation of sampling schemes,the efficient interpolation and reconstruction methods for periodic nonuniform sampling and multi-channel sampling in the fractional Fourier domain are presented. Firstly,the interpolation and sampling identities in the fractional Fourier domain are derived by the properties of the fractional Fourier transform. Then,the particularly efficient filterbank implementations for the periodic nonuniform sampling and the multi-channel sampling in the fractional Fourier domain are introduced. At last,the relationship between the multi-channel sampling and the filterbank in the fractional Fourier domain is investigated,which shows that any perfect reconstruction filterbank can lead to new sampling and reconstruction strategies.

关键词： fractional Fourier transform filterbank interpolation identity

Chronic Food Antigen-specific IgG-mediated Hypersensitivity Reaction as A Risk Factor for Adolescent Depressive Disorder

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Genomics, Proteomics & Bioinformatics 2019年第2期17卷 183-189页

作者： ran tao Zhicheng Fu Lijun Xiao Department of Psychological Medicine The Seventh Medical Center of Chinese PLA General Hospital Beijing 100700 China Department of Trace Element Nutrition National Institute for Nutrition and Health Chinese Center for Disease Control and Prevention Beijing 100050 China

Major depressive disorder (MDD) is the most common nonfatal disease burden world-wide. Systemic chronic low-grade inflammation has been reported to be associated with MDD pro-gression by affecting monoaminergic and glutamatergic neurotransmission. However,whether various proinflammatory cytokines are abnormally elevated before the first episode of depression is still largely unclear. Here,we evaluated 184 adolescent patients who were experiencing their first episode of depressive disorder,and the same number of healthy individuals was included as con-trols. We tested the serum levels of high-sensitivity C-reactive protein (hs-CRP),tumor necrosis factor-α(TNF-α),IgE,14 different types of food antigen-specific IgG,histamine,homocysteine,S100 calcium-binding protein B,and diamine oxidase. We were not able to find any significant dif-ferences in the serum levels of hs-CRP or TNF-αbetween the two groups. However,the histamine level of the patients (12.35μM) was significantly higher than that of the controls (9.73μM,Prance with elevated levels of serum histamine,leading to hyperpermeability of the blood–brain barrier,which has previously been implicated in the pathogen-esis of MDD. Hence,prolonged high levels of serum histamine could be a risk factor for depressive disorders,and antihistamine release might represent a novel therapeutic strategy for depression treatment.

关键词： Major depressive disorder Blood-brain barrier Histamine Hypersensitivity reaction Inflammation

Fractional Fourier domain analysis of cyclic multirate signal processing

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Science China(Technological Sciences) 2008年第6期51卷 803-819页

作者： MENG XiangYi tao ran WANG Yue Department of Electronic Engineering Beijing Institute of TechnologyBeijing 100081China

The cyclic filter banks, which are used widely in the image subband coding, refer to signal processing on the finite field. This study investigates the fractional Fourier domain (FRFD) analysis of cyclic multirate systems based on the fractional circular convolution and chirp period. The proposed theorems include the fractional Fourier domain analysis of cyclic decimation and cyclic interpolation, the noble identities of cyclic decimation and cyclic interpolation in the FRFD, the polyphase represen-tation of cyclic signal in the FRFD, and the perfect reconstruction condition for the cyclic filter banks in the FRFD. Furthermore, this paper proposes the design methods for perfect reconstruction cyclic filter bank and cyclic filter bank with chirp modulation in the FRFD. The proposed theorems extend the multirate signal processing in the FRFD, which also advance the applications of the theorems of filter bank in the FRFD on the finite signal field, such as digital image processing. At last, the proposed design methods for the cyclic filter banks in the FRFD are validated by simulations.

关键词： discrete fractional Fourier transform fractional circular convolution cyclic filter banks perfect reconstruction

膝关节单髁置换与胫骨高位截骨治疗内翻性膝骨关节炎的比较

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中国组织工程研究 2025年第3期29卷 503-509页

作者：石雷施松陆跃陶然马洪冬南通大学附属医院关节外科江苏省南通市226001

背景:早期膝关节炎可行单髁置换和胫骨高位截骨等方法保膝治疗,但两种保膝手术在术后不同时期膝关节恢复方面是否存在差异仍需进一步探讨。目的:比较单髁置换和胫骨高位截骨治疗膝关节内翻性骨关节炎的疗效及相关并发症等方面的差异,为... 详细信息

背景:早期膝关节炎可行单髁置换和胫骨高位截骨等方法保膝治疗,但两种保膝手术在术后不同时期膝关节恢复方面是否存在差异仍需进一步探讨。目的:比较单髁置换和胫骨高位截骨治疗膝关节内翻性骨关节炎的疗效及相关并发症等方面的差异,为临床决策提供参考。方法:选择2018年9月至2022年9月南通大学附属医院行手术治疗的膝关节内翻性骨关节炎患者103例,其中86例获得1年以上随访,根据手术方法分为单髁置换组(n=49)和胫骨高位截骨组(n=37)。分别对两组患者术前及术后4周、3个月、6个月、1年的膝关节功能、疼痛以及力线纠正情况进行评估,采用美国特种外科医院膝关节评分、美国西安大略大学和麦克马斯特大学功能评分、膝关节外侧间隙变化、关节活动度、本体感觉(位置觉)、术后活动恢复速度等指标综合评判。结果与结论:(1)两组患者术前美国特种外科医院膝关节评分、美国西安大略大学和麦克马斯特大学功能评分、膝关节外侧间室大小均无显著差异;(2)术后4周单髁置换组的美国特种外科医院评分高于胫骨高位截骨组(P<0.05);在术后3,6个月,对比两组患者的改善情况,单髁置换组的美国特种外科医院评分低于胫骨高位截骨组,差异有显著性意义(P<0.05);术后6个月关节活动度屈曲值以及位置觉方面胫骨高位截骨组患者要优于单髁置换组(P<0.05);(3)在膝关节活动恢复速度方面单髁置换组要优于胫骨高位截骨组(P<0.05);(4)然而在术后1年的随访中,两组在美国特种外科医院膝关节评分、伸展方向活动度以及膝关节外侧间隙宽度变化上未见明显差异;(5)所有患者的随访数据均超过1年,且在随访期间均未发现不良并发症;(6)提示采用胫骨高位截骨治疗的内翻性膝骨关节炎患者膝关节功能恢复短期效果优于单髁置换患者,但两种方案治疗内翻性膝骨关节炎的中长期疗效无明显差异。

关键词：膝骨关节炎单髁表面置换胫骨高位截骨膝关节功能并发症

BRVAAF and performance analysis for target detection

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Science China(Technological Sciences) 2009年第7期52卷 2096-2103页

作者： Nan Zhang ran tao Yue Wang Department of Electronic Engineering Beijing Institute of Technology Beijing 100081 China

A bistatic range-velocity-acceleration ambiguity function (BRVAAF) is proposed. The model of radar measurements of an accelerating target involving the time delay, Doppler frequency and Doppler rate is given. The relationships between these measurements and the parameters of the bistatic geometry, target position, velocity and acceleration are derived. Moreover, the effects of the bistatic geometry factors on these measurements are analyzed. Besides, the two relationships of the bistatic integration loss and the bistatic optimum integration time with these factors are built and their change trends are described respectively. This research is helpful to analyze the influences of the bistatic geometry factors on the target detection and signal processing.

关键词： bistatic radar ambiguity function integration loss resolution acceleration

Multi-channel sampling theorems for band-limited signals with fractional Fourier transform

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Science China(Technological Sciences) 2008年第6期51卷 790-802页

作者： ZHANG Feng tao ran WANG Yue Department of Electronic Engineering Beijing Institute of TechnologyBeijing 100081China

Multi-channel sampling for band-limited signals is fundamental in the theory of multi-channel parallel A/D environment and multiplexing wireless communication environment. As the fractional Fourier transform has been found wide applications in signal processing fields, it is necessary to consider the multi-channel sampling theorem based on the fractional Fourier transform. In this paper, the multi-channel sampling theorem for the fractional band-limited signal is firstly proposed, which is the generalization of the well-known sampling theorem for the fractional Fourier transform. Since the periodic nonuniformly sampled signal in the fractional Fourier domain has valuable applications, the reconstruction expression for the periodic nonuniformly sampled signal has been then obtained by using the derived multi-channel sampling theorem and the specific space-shifting and phase-shifting properties of the fractional Fourier transform. Moreover, by designing different fractional Fourier filters, we can obtain reconstruction methods for other sampling strategies.

关键词： fractional Fourier transform fractional band-limited signals fractional filter interpolation series periodic nonuniformly sampled signal

Generalized spatial representation for digital modulation and its potential application

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Science China Earth Sciences 2016年第12期59卷 47-58页

作者： Hao HUAN Pengfei SHI Xiaodong YAN ran tao School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China Key Lab for Spacecraft TT&C and Communication under the Ministry of Education Chongqing 400044China

Constellation mapping has provided a great convenience to measure the performance of digital signal modulation in Euclid space. However, traditional in-phase and quadrature(IQ) plane is difficult to express the frequency modulation scheme such as minimum shift keying(MSK) and the time domain modulation such as cyclic code shift keying(CCSK). How to represent the digital signal modulation visually through constellation mapping is an attractive problem. To address this issue, in this paper, the combined frequency and phase modulation are utilized to define a new kind of constellation mapping, where the phase and frequency are quantized to the same elements. The uniform geometric construction for combined phase and frequency modulation is redefined in the 3D cylindrical coordinate system based on frequency(f), in-phase component(I) and quadrature component(Q). In the new coordinates, the quadrature frequency-phase shift keying(QFPSK) is produced by the QPSK with dimensional rotation matrix and denoted by the reduced dual quaternion. Furthermore, the spatial extension from QFPSK to chirp cyclic shift keying(Chirp CSK) is analyzed with bandwidth efficiency and energy efficiency. At last, the QFPSK is combined with the 2D OFDM, yielding the image OFDM *** results verify the effectiveness of QFPSK in the proposed system with the time-varying wireless channel and frequency selective fading channel respectively.

关键词： quadrature frequency-phase shift keying (QFPSK) chirp cyclic shift keying spatial constellation mapping image OFDM system wireless communication

Multi-stage Defender-Attacker-Defender Model for Distribution System Resilience Enhancement in Ice Storms with Line Hardening,Mobile Device and Repair Crew Dispatching

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CSEE Journal of Power and Energy Systems 2023年第3期9卷 1103-1118页

作者： ran tao Dongmei Zhao Haoxiang Wang Xuan Xia School of Electrical and Electronic Engineering North China Electric Power UniversityBeijing 102206China State Grid Shaoxing Power Supply Company Shaoxing 312000China

This paper proposes a co-optimal strategy using line hardening,mobile devices(mobile ice-melting device,mobile emergency generator,mobile energy storage system),and repair crew dispatching to improve distribution system resilience during ice storms.A multi-stage defender-attacker-defender model is established to take into account interactions and coupling relationships between different *** our proposed model,ice storms will attack the distribution and transportation system in a worst-case scenario,affecting system performance from various *** to the different operating states in the distribution system affected by ice storms,aiming at minimizing the weighted load shedding value,this paper applies various measures to different stages to improve the response and defense capabilities to ice storms and realize restoration of the distribution system *** nested column-and-constraint generation algorithm is used to solve the model *** effectiveness of the proposed model and solution method for enhancing the distribution system resilience is verified on the modified IEEE 33-bus distribution system and modified realworld zone of Caracas 141-bus distribution system.

关键词： Defender-attacker-defender model distribution system resilience ice storm line hardening mobile device repair crew

Distributed bias-compensated normalized least-mean squares algorithms with noisy input

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Science China(Information Sciences) 2018年第11期61卷 193-207页

作者： Lu FAN Lijuan JIA ran tao Yue WANG School of Information and Electronics Beijing Institute of Technology

In this paper, we study the problem of distributed normalized least-mean squares(NLMS) estimation over multi-agent networks, where all nodes collaborate to estimate a common parameter of *** consider the situations that all nodes in the network are corrupted by both input and output noise. This yields into biased estimates by the distributed NLMS algorithms. In our analysis, we take all the noise into consideration and prove that the bias is dependent on the input noise variance. Therefore, we propose a bias compensation method to remove the noise-induced bias from the estimated results. In our development, we first assume that the variances of the input noise are known a priori and develop a series of distributed-based bias-compensated NLMS(BCNLMS) methods. Under various practical scenarios, the input noise variance is usually unknown a priori, therefore it is necessary to first estimate for its value before bias removal. Thus, we develop a real-time estimation method for the input noise variance, which overcomes the unknown property of this noise. Moreover, we perform some main analysis results of the proposed distributed BCNLMS algorithms. Furthermore, we illustrate the performance of the proposed distributed bias compensation method via graphical simulation results.

关键词： distributed parameter estimation normalized least-mean squares bias-compensated algorithms