• <tr id="yyy80"></tr>
  • <sup id="yyy80"></sup>
  • <tfoot id="yyy80"><noscript id="yyy80"></noscript></tfoot>
  • 99热精品在线国产_美女午夜性视频免费_国产精品国产高清国产av_av欧美777_自拍偷自拍亚洲精品老妇_亚洲熟女精品中文字幕_www日本黄色视频网_国产精品野战在线观看 ?

    Dynamical behavior of memristor-coupled heterogeneous discrete neural networks with synaptic crosstalk

    2024-02-29 09:19:58MinglinMa馬銘磷KanglingXiong熊康靈ZhijunLi李志軍andShaoboHe賀少波
    Chinese Physics B 2024年2期

    Minglin Ma(馬銘磷), Kangling Xiong(熊康靈), Zhijun Li(李志軍), and Shaobo He(賀少波)

    School of Automation and Electronic Information,Xiangtan University,Xiangtan 411105,China

    Keywords: discrete memristor,synaptic crosstalk,coexisting attractor,phase synchronization

    1.Introduction

    Neurons are the fundamental units of structure and function in the nervous system, and they form neural networks through various types of connections.[1]Neural networks play a crucial role in fields such as signal processing,[2,3]associative memory,[4,5]robot control,[6]and image processing.[7–9]As is widely known, a memristor is a device that describes the relationship between charge and flux.[10]Since its development by HP Laboratory in 2008, memristors have found extensive applications in neural networks,[11–15]image encryption,[16,17]chaotic systems,[18–24]and more.Due to their unique biomimetic properties, such as nanoscale size, low power consumption, and non-volatility, continuous memristors are considered the optimal choice for simulating synapses in analog form.[25–30]Compared to conventional electronic synapses, neural networks based on memristive synapses can more effectively mimic the complex firing activity of biological neural networks.For instance,memristor-coupled neural networks can generate grid multiscroll attractors,[31–34]diverse chaotic attractors that are employed in image encryption.[35]Locally active memristorbased Hopfield neural networks can exhibit more complex dynamical behaviors.[36]

    So far, several models of discrete neurons, such as the Chialvo model,Rulkov model,Izhikevich model,and Kinouvhi and Tragtenberg (KT) model, have been proposed.Discrete neuron models have advantages over continuous neuron models in terms of computational time, computational resources, and data storage.[37–42]Therefore, discrete neuron models are more suitable for simulating large-scale neural networks and conducting general research, such as generating chaotic trajectories, pattern recognition, and analyzing synchronized firing behaviors.[43–51]As a result, research on discrete neurons has become a hot topic in recent years.In discrete memristor-coupled neural networks, complex dynamical behaviors have been discovered,including coexisting attractors,[52–56]synchronization transitions,and synchronization coexistence.[57,58]Additionally, Luet al.[59]investigated fractional-order neural networks based on discrete memristors and found that this system exhibits richer dynamical behaviors compared to integer-order neural networks.

    Synaptic crosstalk refers to the spillover of neurotransmitters from one synapse to another or the lateral diffusion of receptors from one spine to neighboring spines.It has profound implications for neural signal transmission.[60,61]Increasing evidence suggests the widespread occurrence of synaptic crosstalk among neuronal synapses.Considering synaptic crosstalk,Lenget al.proposed a heterogeneous neural network (HNN) and analyzed the dynamical behavior of the HNN.[62]Liet al.proposed an associative memory circuit based on memristors that takes into account synaptic crosstalk and demonstrated its impact on memory function.[63]Based on the above research, we found that crosstalk can affect the dynamic behavior and associative memory energy of neural networks.Therefore,exploring the behavior of discrete neural networks with crosstalk behavior has practical significance.

    Inspired by the aforementioned papers, it is proposed that discrete memristors are used to mimic synapses, coupling a Chialvo neuron and a KTz neuron.Considering the crosstalk behavior between synapses, a memristor-coupled HDNN model is constructed and the dynamical behavior of this neural network is analyzed.The structure of this paper is as follows: In Section 2, a novel discrete memristor model is introduced.In Section 3, the memristor-coupled HDNN model with synaptic crosstalk is proposed.Section 4 investigates the coexistence behavior of the HDNN.In Section 5,the phase synchronization behavior of the memristor-coupled HDNN under different crosstalk strengths is discussed.Finally,conclusions are provided.

    2.Discrete memristor

    2.1.Discrete memristor model and its characteristics

    In this study, we employ two discrete memristors to mimic synapses, coupling two different types of neurons: a KTz neuron and a Chialvo neuron.The topological structure of this neural network is illustrated in Fig.1.The model of the memristor synapse can be expressed by

    wherei(n) andv(n) respectively represent the input current and voltage at both ends of the discrete memristor, andW[q(n)] is the memristor inductance value of the memristor.α,γ,δ,βare four memristor parameters.In this paper, we setα= 0.1,β= 1,δ= 5,γ= 1.To model the phenomenon of synaptic crosstalk, we consider the interaction between two memristors.The weights of the two discrete memristor synapses can be described as follows:

    Fig.1.Topological structure of the HDNN with synaptic crosstalk.

    2.2.Pinched hysteresis loops

    Under the condition of an input sinusoidal voltage signalv(n)=Asin(wT(n)), and the initial value of the discrete memristorq(1)=-2,the voltage–current characteristic curve of the discrete memristor is shown in Fig.2.By changing the amplitude of the sinusoidal voltage signal, figure 2(a) illustrates an “8” shaped hysteresis loop crossing the origin, and the area of the loop gradually increases with the increase in amplitude.By varying the frequency of the sinusoidal voltage signal,figure 2(b)shows the hysteresis loop gradually shrinking.As the frequency increases,the area of the hysteresis loop gradually decreases until it becomes a single-valued function.Therefore,this discrete memristor complies with the definition of a generalized memristor.

    Fig.2.Hysteresis loop of the memristor: (a)w=0.0002,A=20,22,25,(b)A=25,w=0.0002,0.0004,0.0005.

    3.Memristor-coupled HDNN

    3.1.KTz neurons and Chialvo neurons

    The model of three-dimensional KTz neurons is as follows:[64]

    wherex(n) represents the membrane potential of the neuron,y(n)denotes the recovery variable,z(n)represents the slow total ion current.a,d,t,g,handuare parameters that control the firing patterns of the neuron.

    The model of two-dimensional Chialvo neurons is as follows:[65]

    wherex(n) represents the membrane potential of the neuron,y(n)denotes the recovery variable,a,bandcare parameters,andI(t)can be regarded as the external input current.

    3.2.Model of the memristor-coupled HDNN

    The model of the memristor-coupled HDNN with synaptic crosstalk is represented by Eq.(5),wherekis the coupling strength of the neural network,b1andb2are the crosstalk strengths of the system.The remaining parameters of the system are as follows:a= 0.6,t= 0.35,c= 0.1,c1= 0.28,a1=0.9,d=0.4,d1=0.03,r=0.6,k=0.2,g=0.008,h=0.008,u=-0.3,δ=5,γ=2.

    3.3.Analysis of equilibrium points

    The corresponding Jacobian matrix is

    The equilibrium points and eigenvalues for different levels of crosstalk strength are shown in Table 1.

    Table 1.Equilibrium points,corresponding eigenvalues and stabilities.

    The stability of equilibrium points in chaotic systems significantly influences the dynamical behavior.The stability of the equilibrium points can be determined based on the eigenvalues.When the eigenvalues lie within the unit circle, the equilibrium points are stable;otherwise,they are unstable.

    To analyze the impact of crosstalk strength on the dynamics of the memristor-coupled HDNN,certain system parameters are held constant as follows:a=0.6,t=0.35,c=0.1,c1=0.28,a1=0.9,d=0.4,d1=0.03,r=0.6,g=0.008,h=0.008,andu=-0.3.

    Fig.3.Bifurcation diagram and Lyapunov exponent plot with respect to crosstalk strength b1.(a) Bifurcation diagram with respect to b1 for the initial condition (-1,1,1,-1,1,1,1); (b) Lyapunov exponent plot with respect to b1 for the initial condition(-1,1,1,-1,1,1,1);(c)bifurcation diagram with respect to b1 for the initial condition(-1,1,1,-1,1,-1,1);(d) Lyapunov exponent plot with respect to b1 for the initial condition(-1,1,1,-1,1,-1,1).

    Fig.4.Phase portrait in the x1–y1 plane and time series plot of x1 for different crosstalk strengths b1.[(a)and(b)]b1=2,coexistence of chaotic attractors and chaotic attractors; [(c) and (d)] b1 =1.15, coexistence of chaotic attractors and periodic attractors;[(e)and(f)]b1=-0.88;coexistence of periodic attractors and chaotic attractors;[(g)and(h)]b1=1.03,coexistence of periodic attractors and periodic attractors.

    4.Impact of crosstalk strength on multistability

    4.1.Impact of crosstalk strength b1

    When the coupling strengthk= 0.2 and the crosstalk strengthb2=0.2,considering two different initial conditions(-1,1,1,-1,1,1,1) and (-1,1,1,-1,1,-1,1), the bifurcation diagram and Lyapunov exponent plot with respect to the crosstalk strengthb1are shown in Fig.3.Obviously,this system shows the characteristics of multistability.To provide a more visual representation of the system’s multistability, we plot the different coexisting attractors under different crosstalk strengths in Fig.4.We observe the coexistence of chaotic attractors with chaotic attractors,chaotic attractors with periodic attractors,periodic attractors with chaotic attractors,and periodic attractors with periodic attractors in the system.

    4.2.Impact of crosstalk strength b2

    When the coupling strengthk= 0.2 and the crosstalk strengthb1=0.85,considering two different initial conditions(-1,1,1,-1,1,1,1) and (-1,1,1,-1,1,-1,1), the bifurcation diagram and Lyapunov exponent plot with respect to the crosstalk strengthb2are shown in Fig.5.Different coexisting attractors under different crosstalk strengths are shown in Fig.6.It is observed that under this condition,the system exhibits the coexistence of chaotic attractors with chaotic attractors,chaotic attractors with periodic attractors,periodic attractors with chaotic attractors, and periodic attractors with periodic attractors.

    5.Impact of crosstalk strength on phase synchronization

    When studying the influence of different crosstalk strengths on the phase synchronization of neurons, the phase of the neurons can be expressed by the following equation:With a fixed value ofk=0.2 andb1=0.85,when the crosstalk strengthb2= 0.5, as shown in Figs.7(a) and 7(b), the firing pattern of the neurons is characterized by spike firing,and the two neurons are not synchronized.In Figs.7(c)and 7(d),it can be seen that as the crosstalk strengthb2decreases to 0.1, the two neurons gradually start to synchronize.When the crosstalk strengthb2=-1, as shown in Figs.7(e) and 7(f), one neuron exhibits firing in chaotic clusters, while the other neuron exhibits spike firing, and phase synchronization is achieved.

    Fig.5.Bifurcation diagram and Lyapunov exponent plot with respect to crosstalk strength b2.(a) Bifurcation diagram with respect to b2 for the initial condition (-1,1,1,-1,1,1,1); (b) Lyapunov exponent plot with respect to b2 for the initial condition(-1,1,1,-1,1,1,1);(c)bifurcation diagram with respect to b2 for the initial condition(-1,1,1,-1,1,-1,1);(d) Lyapunov exponent plot with respect to b2 for the initial condition(-1,1,1,-1,1,-1,1).

    Fig.6.Phase portrait in the x1–y1 plane and time series plot of x1 for different crosstalk strengths b2.[(a) and (b)] b2 = 1, coexistence of chaotic attractors and chaotic attractors; [(c) and (d)] b2 =1.255, coexistence of chaotic attractors and periodic attractors;[(e)and(f)]b2=1.3,coexistence of periodic attractors and chaotic attractors; [(g) and (h)]b2=-0.25,coexistence of periodic attractors and periodic attractors.

    With a fixed crosstalk strength ofb2= 0.2, when the crosstalk strengthb1=0.1, as shown in Figs.8(a) and 8(b),it can be observed that the phase of the two neurons is not synchronized.As depicted in Figs.8(c) and 8(d), when the crosstalk strengthb1decreases to-0.5,their phases gradually synchronize.Further reducing the crosstalk strength to-1.2,both neurons exhibit spike firing patterns and achieve phase synchronization.

    Fig.7.Synchronization transition of the memristor-coupled HDNN with a fixed crosstalk strength of b1.[(a) and (b)] b2 = 0.5; [(c) and (d)]b2=0.1;[(e)and(f)]b2=-1.

    Fig.8.Synchronization transition of the memristor-coupled HDNN with a fixed crosstalk strength of b2.[(a) and (b)] b1 =0; [(c) and (d)]b1=-0.5;[(e)and(f)]b1=-1.2.

    6.Conclusion

    In this paper, we propose a memristor-coupled HDNN,which consists of a two-dimensional Chialvo discrete neuron,a three-dimensional KTz discrete neuron, and two memristor synapses.The synaptic crosstalk within the network is modeled by mutual coupling between the memristor synapses.It is found that the system exhibits different attractor coexistence phenomena under different crosstalk strengths, including coexisting chaotic and chaotic attractors, coexisting chaotic and periodic attractors, and coexisting periodic and periodic attractors, which reveals the multistability behavior of the memristor-coupled HDNN.Furthermore, in this paper,the synchronous firing behavior between two discrete neurons is investigated by varying the crosstalk strength.

    Acknowledgments

    Project supported by the Key Projects of Hunan Provincial Department of Education (Grant No.23A0133), the Natural Science Foundation of Hunan Province (Grant No.2022JJ30572),and the National Natural Science Foundations of China(Grant No.62171401).

    亚洲欧美日韩另类电影网站| 精品国产一区二区久久| 男男h啪啪无遮挡| 在线免费观看不下载黄p国产| 午夜影院在线不卡| 亚洲欧美精品自产自拍| 久久久久国产一级毛片高清牌| 亚洲精品av麻豆狂野| 国产精品一二三区在线看| 日韩电影二区| 日韩人妻精品一区2区三区| 18禁裸乳无遮挡动漫免费视频| 热re99久久国产66热| 香蕉精品网在线| 少妇的逼水好多| 高清黄色对白视频在线免费看| 日日撸夜夜添| 免费日韩欧美在线观看| 久久婷婷青草| 日韩av在线免费看完整版不卡| 高清av免费在线| 夜夜骑夜夜射夜夜干| 亚洲图色成人| 亚洲成人av在线免费| 国产熟女午夜一区二区三区| 卡戴珊不雅视频在线播放| 国产精品久久久久久精品古装| 国产精品国产av在线观看| 纵有疾风起免费观看全集完整版| 在线观看三级黄色| 老司机影院成人| 亚洲欧美色中文字幕在线| 国产av精品麻豆| 久久久久精品久久久久真实原创| 9191精品国产免费久久| 91成人精品电影| 国产高清不卡午夜福利| 18禁裸乳无遮挡动漫免费视频| 日韩欧美精品免费久久| 老女人水多毛片| 老司机影院毛片| 亚洲欧洲国产日韩| 性色avwww在线观看| 久久精品国产鲁丝片午夜精品| 女性生殖器流出的白浆| av免费在线看不卡| 婷婷色综合www| 97在线人人人人妻| 免费高清在线观看日韩| 极品人妻少妇av视频| 国产成人免费无遮挡视频| 纯流量卡能插随身wifi吗| 国产在线视频一区二区| 菩萨蛮人人尽说江南好唐韦庄| 91精品伊人久久大香线蕉| 国产欧美日韩一区二区三区在线| 女性生殖器流出的白浆| 中文字幕色久视频| 欧美 亚洲 国产 日韩一| 国产野战对白在线观看| 纵有疾风起免费观看全集完整版| 国产人伦9x9x在线观看 | 欧美日韩视频精品一区| 啦啦啦中文免费视频观看日本| 美女视频免费永久观看网站| 亚洲av电影在线进入| 极品人妻少妇av视频| 咕卡用的链子| 欧美av亚洲av综合av国产av | 久久久久精品久久久久真实原创| 亚洲欧美清纯卡通| 亚洲欧美色中文字幕在线| 午夜福利在线观看免费完整高清在| 各种免费的搞黄视频| 好男人视频免费观看在线| 18禁观看日本| 精品人妻熟女毛片av久久网站| 成人毛片60女人毛片免费| 男女免费视频国产| 黄色毛片三级朝国网站| 中文乱码字字幕精品一区二区三区| 老熟女久久久| 岛国毛片在线播放| 波多野结衣一区麻豆| www.精华液| 国产精品熟女久久久久浪| 亚洲国产精品国产精品| 看免费成人av毛片| 国产精品成人在线| 久久热在线av| 亚洲欧美日韩另类电影网站| 久久狼人影院| 日本免费在线观看一区| 亚洲国产av新网站| 热re99久久国产66热| 美女视频免费永久观看网站| 欧美黄色片欧美黄色片| 国产成人精品久久二区二区91 | 捣出白浆h1v1| 男的添女的下面高潮视频| 精品一区二区免费观看| 国产1区2区3区精品| 啦啦啦啦在线视频资源| h视频一区二区三区| 大香蕉久久网| 天天躁夜夜躁狠狠久久av| 又大又黄又爽视频免费| 久久久国产一区二区| 一二三四中文在线观看免费高清| 国产精品嫩草影院av在线观看| 中文字幕亚洲精品专区| 亚洲精华国产精华液的使用体验| 在线天堂最新版资源| 日韩中字成人| 丰满乱子伦码专区| 亚洲精品国产av成人精品| 亚洲国产欧美日韩在线播放| 久热这里只有精品99| 在线天堂最新版资源| 日韩精品有码人妻一区| 男女国产视频网站| 久久久久久人妻| 国产一区二区三区综合在线观看| av.在线天堂| 国产亚洲欧美精品永久| 亚洲精品av麻豆狂野| 国产精品久久久久久久久免| 在线看a的网站| 亚洲欧洲日产国产| 黄网站色视频无遮挡免费观看| 久久鲁丝午夜福利片| 搡女人真爽免费视频火全软件| 一区二区三区乱码不卡18| 久久国产精品男人的天堂亚洲| 欧美精品人与动牲交sv欧美| 中文字幕av电影在线播放| 伊人久久国产一区二区| 亚洲av国产av综合av卡| 精品卡一卡二卡四卡免费| 亚洲欧美色中文字幕在线| 日韩av在线免费看完整版不卡| 我的亚洲天堂| tube8黄色片| 一级片免费观看大全| 观看美女的网站| 亚洲av在线观看美女高潮| 永久网站在线| 日本爱情动作片www.在线观看| 黑人巨大精品欧美一区二区蜜桃| 一级片免费观看大全| 天美传媒精品一区二区| 国产野战对白在线观看| 久久99精品国语久久久| 精品久久久精品久久久| 欧美黄色片欧美黄色片| 日韩中文字幕视频在线看片| 国产无遮挡羞羞视频在线观看| 欧美最新免费一区二区三区| 国产日韩一区二区三区精品不卡| 新久久久久国产一级毛片| 永久免费av网站大全| 在线观看国产h片| 亚洲国产成人一精品久久久| 久久久久久久久久久久大奶| 国产免费一区二区三区四区乱码| 亚洲,欧美精品.| 人人妻人人澡人人看| 色婷婷久久久亚洲欧美| 性高湖久久久久久久久免费观看| www.精华液| 欧美成人精品欧美一级黄| 日本免费在线观看一区| av在线播放精品| 丝袜喷水一区| 欧美日韩精品成人综合77777| 人妻人人澡人人爽人人| 亚洲在久久综合| 亚洲一级一片aⅴ在线观看| 最近2019中文字幕mv第一页| 国产男女超爽视频在线观看| 国产高清国产精品国产三级| 丝袜喷水一区| 日韩伦理黄色片| 成年女人在线观看亚洲视频| 26uuu在线亚洲综合色| 国产精品嫩草影院av在线观看| 亚洲,欧美,日韩| 日韩一卡2卡3卡4卡2021年| 曰老女人黄片| 精品人妻熟女毛片av久久网站| 一本—道久久a久久精品蜜桃钙片| 免费黄色在线免费观看| 伦理电影大哥的女人| 国产男人的电影天堂91| 乱人伦中国视频| 男的添女的下面高潮视频| 欧美精品av麻豆av| av在线老鸭窝| 亚洲欧洲国产日韩| 麻豆乱淫一区二区| 国产免费福利视频在线观看| 热re99久久国产66热| 一区二区日韩欧美中文字幕| 日本色播在线视频| 色婷婷久久久亚洲欧美| 老汉色av国产亚洲站长工具| 亚洲欧洲日产国产| 天天躁狠狠躁夜夜躁狠狠躁| 国产 一区精品| 中文字幕精品免费在线观看视频| 亚洲精品美女久久av网站| 国产一区亚洲一区在线观看| 18禁观看日本| 黄片无遮挡物在线观看| 久久久久精品性色| 99精国产麻豆久久婷婷| 啦啦啦在线免费观看视频4| 巨乳人妻的诱惑在线观看| 两性夫妻黄色片| 夜夜骑夜夜射夜夜干| 精品少妇黑人巨大在线播放| 男女边吃奶边做爰视频| 999久久久国产精品视频| 交换朋友夫妻互换小说| 久久韩国三级中文字幕| 伦精品一区二区三区| 777米奇影视久久| 美女视频免费永久观看网站| 老鸭窝网址在线观看| 久久国产亚洲av麻豆专区| 亚洲国产看品久久| 桃花免费在线播放| 国产爽快片一区二区三区| 久久免费观看电影| 亚洲av免费高清在线观看| 91精品三级在线观看| 大码成人一级视频| 精品人妻一区二区三区麻豆| 又大又黄又爽视频免费| 婷婷色av中文字幕| 这个男人来自地球电影免费观看 | 久久精品国产亚洲av天美| 91午夜精品亚洲一区二区三区| av国产久精品久网站免费入址| 亚洲人成网站在线观看播放| 亚洲一级一片aⅴ在线观看| 美女视频免费永久观看网站| 只有这里有精品99| 久久精品夜色国产| av.在线天堂| 亚洲精品av麻豆狂野| av视频免费观看在线观看| av片东京热男人的天堂| 久久久久久久大尺度免费视频| a级毛片在线看网站| 天天躁日日躁夜夜躁夜夜| 深夜精品福利| 91久久精品国产一区二区三区| 精品亚洲成国产av| 亚洲欧美成人综合另类久久久| 少妇熟女欧美另类| 老鸭窝网址在线观看| 午夜老司机福利剧场| 精品人妻熟女毛片av久久网站| 免费久久久久久久精品成人欧美视频| 国产精品麻豆人妻色哟哟久久| 国产欧美日韩综合在线一区二区| 婷婷色av中文字幕| 91国产中文字幕| 曰老女人黄片| 最近最新中文字幕大全免费视频 | 黄色怎么调成土黄色| 男女无遮挡免费网站观看| 日韩制服骚丝袜av| 成年av动漫网址| 欧美亚洲 丝袜 人妻 在线| 国产精品熟女久久久久浪| 亚洲经典国产精华液单| 高清不卡的av网站| 成年人免费黄色播放视频| 免费av中文字幕在线| 丁香六月天网| 国产一区二区在线观看av| 国产精品久久久久久精品古装| 母亲3免费完整高清在线观看 | 黄色配什么色好看| 亚洲精品久久午夜乱码| 久久av网站| 国产精品 欧美亚洲| 天天影视国产精品| 亚洲精品乱久久久久久| 日日啪夜夜爽| 日本wwww免费看| 亚洲精品在线美女| 一区二区三区精品91| 欧美日韩av久久| 叶爱在线成人免费视频播放| 亚洲欧美一区二区三区久久| 久久久国产精品麻豆| 国产精品女同一区二区软件| 尾随美女入室| 美女xxoo啪啪120秒动态图| 精品人妻在线不人妻| 成年女人毛片免费观看观看9 | 久久97久久精品| 宅男免费午夜| 亚洲欧洲精品一区二区精品久久久 | 日韩中文字幕欧美一区二区 | 肉色欧美久久久久久久蜜桃| 天天躁日日躁夜夜躁夜夜| 大香蕉久久网| 久久99热这里只频精品6学生| 久久久欧美国产精品| 一级片'在线观看视频| 午夜福利视频在线观看免费| 七月丁香在线播放| 91成人精品电影| 亚洲欧美成人综合另类久久久| 欧美亚洲日本最大视频资源| 波多野结衣一区麻豆| 亚洲人成77777在线视频| 看免费av毛片| 亚洲久久久国产精品| 伦理电影免费视频| 一区福利在线观看| 熟女少妇亚洲综合色aaa.| 欧美精品高潮呻吟av久久| 亚洲国产av影院在线观看| 18禁动态无遮挡网站| 青草久久国产| 老汉色∧v一级毛片| 大香蕉久久成人网| 另类精品久久| 婷婷色综合大香蕉| 国产精品蜜桃在线观看| 最新中文字幕久久久久| 久久人人97超碰香蕉20202| 日本午夜av视频| 在线观看www视频免费| 麻豆av在线久日| 欧美精品亚洲一区二区| 一级,二级,三级黄色视频| 亚洲欧美中文字幕日韩二区| 男的添女的下面高潮视频| 中文乱码字字幕精品一区二区三区| 免费观看av网站的网址| 2021少妇久久久久久久久久久| 精品国产露脸久久av麻豆| 免费av中文字幕在线| 国产精品香港三级国产av潘金莲 | 亚洲美女视频黄频| 国产乱人偷精品视频| 免费播放大片免费观看视频在线观看| 午夜精品国产一区二区电影| 日本wwww免费看| 国产深夜福利视频在线观看| 极品人妻少妇av视频| 99久久人妻综合| 国产极品粉嫩免费观看在线| www.自偷自拍.com| 国产麻豆69| 18禁观看日本| 性少妇av在线| 亚洲少妇的诱惑av| 成人国产av品久久久| 人妻一区二区av| 亚洲国产精品一区三区| 不卡视频在线观看欧美| 免费观看无遮挡的男女| 亚洲人成77777在线视频| 色播在线永久视频| 国产有黄有色有爽视频| 日本欧美国产在线视频| 欧美精品人与动牲交sv欧美| 99热全是精品| 香蕉国产在线看| 另类精品久久| 久久久久精品久久久久真实原创| 亚洲少妇的诱惑av| 在线观看三级黄色| 80岁老熟妇乱子伦牲交| 精品第一国产精品| 日本黄色日本黄色录像| 色播在线永久视频| 日本-黄色视频高清免费观看| 亚洲四区av| 高清黄色对白视频在线免费看| 久久久久网色| 亚洲av中文av极速乱| 麻豆乱淫一区二区| 日本午夜av视频| 999久久久国产精品视频| 亚洲欧美成人综合另类久久久| 久久精品国产亚洲av天美| 99热网站在线观看| 国产xxxxx性猛交| 免费久久久久久久精品成人欧美视频| 国产又色又爽无遮挡免| 综合色丁香网| 成人免费观看视频高清| 精品久久久精品久久久| 纵有疾风起免费观看全集完整版| 秋霞在线观看毛片| 免费观看a级毛片全部| 亚洲国产成人一精品久久久| 国产成人免费观看mmmm| 精品一区二区三卡| 激情五月婷婷亚洲| 老汉色av国产亚洲站长工具| 国产免费一区二区三区四区乱码| 亚洲欧美精品自产自拍| a 毛片基地| 一级,二级,三级黄色视频| 黄网站色视频无遮挡免费观看| 91aial.com中文字幕在线观看| 香蕉精品网在线| 少妇人妻 视频| 日日啪夜夜爽| 日韩av免费高清视频| 国产精品国产av在线观看| 久久综合国产亚洲精品| 美女高潮到喷水免费观看| 热re99久久国产66热| 在线天堂最新版资源| 在线 av 中文字幕| 汤姆久久久久久久影院中文字幕| 中文字幕亚洲精品专区| 最近最新中文字幕免费大全7| 久久久久久久亚洲中文字幕| 夫妻午夜视频| 亚洲,欧美,日韩| 久久国产亚洲av麻豆专区| 人体艺术视频欧美日本| 黄色视频在线播放观看不卡| 青草久久国产| 99久久人妻综合| 精品久久蜜臀av无| 亚洲视频免费观看视频| 亚洲色图综合在线观看| 欧美日韩一区二区视频在线观看视频在线| 97人妻天天添夜夜摸| 久久精品亚洲av国产电影网| 在线亚洲精品国产二区图片欧美| 18禁裸乳无遮挡动漫免费视频| 精品一品国产午夜福利视频| 女人精品久久久久毛片| 纯流量卡能插随身wifi吗| 国产熟女午夜一区二区三区| 色吧在线观看| av不卡在线播放| 免费高清在线观看日韩| av天堂久久9| 久久精品aⅴ一区二区三区四区 | 在线观看三级黄色| 久久久久久人人人人人| 国产福利在线免费观看视频| 大片免费播放器 马上看| 在线精品无人区一区二区三| 97在线视频观看| 波多野结衣av一区二区av| 视频区图区小说| 亚洲精品在线美女| 欧美日韩视频精品一区| 男女午夜视频在线观看| 欧美另类一区| 丰满饥渴人妻一区二区三| 99国产综合亚洲精品| av国产久精品久网站免费入址| 大陆偷拍与自拍| 91精品国产国语对白视频| 看免费成人av毛片| 成人影院久久| 亚洲精品久久成人aⅴ小说| 久久久久国产一级毛片高清牌| 国产午夜精品一二区理论片| 日日摸夜夜添夜夜爱| 免费观看在线日韩| 精品少妇一区二区三区视频日本电影 | 美女主播在线视频| 欧美av亚洲av综合av国产av | 青春草国产在线视频| 蜜桃在线观看..| 国产免费视频播放在线视频| 国产免费福利视频在线观看| 一区二区三区激情视频| 日本vs欧美在线观看视频| 日韩精品免费视频一区二区三区| 最近中文字幕高清免费大全6| 熟女电影av网| 三级国产精品片| 国产麻豆69| h视频一区二区三区| 久久久久久久精品精品| 精品国产乱码久久久久久男人| 国产成人aa在线观看| 中文字幕人妻熟女乱码| 国产精品久久久av美女十八| 久久热在线av| 熟女电影av网| 国产精品国产三级国产专区5o| 精品国产一区二区久久| 精品视频人人做人人爽| 一区二区三区四区激情视频| 最近最新中文字幕大全免费视频 | 一二三四在线观看免费中文在| 日本午夜av视频| 久久久久久久亚洲中文字幕| 青青草视频在线视频观看| 欧美日韩综合久久久久久| 97人妻天天添夜夜摸| 欧美日韩一级在线毛片| 天天影视国产精品| 我的亚洲天堂| 亚洲欧美精品自产自拍| 国产一级毛片在线| 亚洲av福利一区| 国产成人一区二区在线| 日韩免费高清中文字幕av| 欧美日韩成人在线一区二区| 丁香六月天网| 国产一区二区 视频在线| 国产av精品麻豆| 韩国av在线不卡| 少妇人妻久久综合中文| 午夜免费男女啪啪视频观看| av国产久精品久网站免费入址| 1024视频免费在线观看| 亚洲精品一区蜜桃| 激情五月婷婷亚洲| 老司机影院毛片| 久久人人爽人人片av| 国产麻豆69| 热99久久久久精品小说推荐| av国产久精品久网站免费入址| 视频在线观看一区二区三区| 亚洲伊人色综图| 伦理电影免费视频| 99国产综合亚洲精品| 亚洲三区欧美一区| 国产成人精品一,二区| 人人澡人人妻人| 亚洲第一区二区三区不卡| 韩国高清视频一区二区三区| 免费不卡的大黄色大毛片视频在线观看| 欧美激情 高清一区二区三区| 天天躁日日躁夜夜躁夜夜| 天天躁夜夜躁狠狠久久av| 国产深夜福利视频在线观看| 国产高清国产精品国产三级| 国产有黄有色有爽视频| 在线观看www视频免费| 少妇的丰满在线观看| 欧美人与善性xxx| 国产精品熟女久久久久浪| 国产熟女午夜一区二区三区| 日韩精品免费视频一区二区三区| 少妇猛男粗大的猛烈进出视频| 欧美精品人与动牲交sv欧美| 黑人巨大精品欧美一区二区蜜桃| 国产视频首页在线观看| 成人亚洲欧美一区二区av| 秋霞在线观看毛片| 亚洲av.av天堂| 伦精品一区二区三区| 女性被躁到高潮视频| 美女主播在线视频| 80岁老熟妇乱子伦牲交| 午夜老司机福利剧场| 91aial.com中文字幕在线观看| 国产xxxxx性猛交| 国产1区2区3区精品| 午夜日本视频在线| av在线app专区| 美女xxoo啪啪120秒动态图| 欧美xxⅹ黑人| 欧美 日韩 精品 国产| 亚洲欧洲日产国产| 色网站视频免费| 国产精品久久久久久精品古装| 2018国产大陆天天弄谢| 美女高潮到喷水免费观看| 侵犯人妻中文字幕一二三四区| av免费在线看不卡| 国产在线视频一区二区| 九色亚洲精品在线播放| 女人精品久久久久毛片| 不卡视频在线观看欧美| 亚洲欧美一区二区三区国产| av免费在线看不卡| 亚洲,欧美精品.| 五月天丁香电影| 免费播放大片免费观看视频在线观看| 国产不卡av网站在线观看| 2021少妇久久久久久久久久久| 看非洲黑人一级黄片| 亚洲人成网站在线观看播放| 春色校园在线视频观看| 欧美bdsm另类| 宅男免费午夜| www日本在线高清视频| 国产国语露脸激情在线看| 免费看不卡的av| 免费日韩欧美在线观看| 搡女人真爽免费视频火全软件| 免费在线观看完整版高清| 美女国产高潮福利片在线看| 少妇人妻 视频| 伦精品一区二区三区| 97人妻天天添夜夜摸| 中国三级夫妇交换| 九草在线视频观看| 久久人人爽人人片av| 国产成人精品婷婷| 成人亚洲欧美一区二区av| 久热久热在线精品观看|