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执行功能训练对数学学习困难小学生数学能力的促进作用
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作者 任偲 蔡丹 《中国特殊教育》 CSSCI 北大核心 2019年第6期63-71,共9页
数学学习困难小学生的执行功能在三个子成分(抑制、刷新和转换)中均具有普遍性缺陷。研究考察执行功能训练对数困生认知和数学能力的促进效果。从上海某小学1295名学生中筛选出37名数困生(训练组18名,对照组19名)作为研究对象,两组学生... 数学学习困难小学生的执行功能在三个子成分(抑制、刷新和转换)中均具有普遍性缺陷。研究考察执行功能训练对数困生认知和数学能力的促进效果。从上海某小学1295名学生中筛选出37名数困生(训练组18名,对照组19名)作为研究对象,两组学生接受包括抑制、刷新、转换以及数学能力的基线评估后,训练组学生接受10周25次抑制、刷新、转换等任务的执行功能训练。训练结束后立即对两组学生进行后测。重复测量方差分析结果表明,训练对学生在抑制、刷新、转换功能以及数学能力等方面具有积极效果。通过对抑制、刷新、转换等功能的训练可以改善数学学习困难小学生的执行功能及数学能力。 展开更多
关键词 数学学习困难 抑制 刷新 转换 执行功能训练
北京地铁1号线与八通线联锁系统贯通倒切研究 预览
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作者 谢千野 王冬海 《铁路通信信号工程技术》 2019年第3期44-46,共3页
根据北京地铁用户需求,八通线CBTC系统改造完成后将与既有1号线贯通运营,原1号线四惠站联锁控制设备并入八通线联锁控制,原1号线四惠东站联锁控制设备并入八通线联锁控制。从倒切原理、倒切柜设计、倒切柜接入对贯通调试过程中联锁系统... 根据北京地铁用户需求,八通线CBTC系统改造完成后将与既有1号线贯通运营,原1号线四惠站联锁控制设备并入八通线联锁控制,原1号线四惠东站联锁控制设备并入八通线联锁控制。从倒切原理、倒切柜设计、倒切柜接入对贯通调试过程中联锁系统倒切方法进行研究,形成切实可行的倒切方案,为项目实施提供理论基础。 展开更多
关键词 联锁 倒切 过渡
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一个切换混沌系统的设计及其电路仿真 预览
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作者 石建平 杨兰天 《现代电子技术》 北大核心 2019年第8期59-62,67共5页
在Lorenz混沌系统的基础之上,通过对系统方程的变形得到4个混沌子系统,进一步构造一个由4个混沌子系统组成的切换混沌系统。该系统通过开关选择器,能够在4个混沌系统之间自动切换。详细分析系统的平衡点及其稳定性、耗散性、最大Lyapuno... 在Lorenz混沌系统的基础之上,通过对系统方程的变形得到4个混沌子系统,进一步构造一个由4个混沌子系统组成的切换混沌系统。该系统通过开关选择器,能够在4个混沌系统之间自动切换。详细分析系统的平衡点及其稳定性、耗散性、最大Lyapunov指数以及混沌吸引子的相图等基本特性。与Lorenz混沌系统具有更大的最大Lyapunov指数,其混沌吸引子更加复杂。基于微控制器数字平台,设计实现该切换混沌系统的数字硬件电路,电路实验仿真结果与数值仿真结果基本一致,证实了该混沌系统的存在性和物理上的可实现性。 展开更多
关键词 LORENZ系统 混沌子系统 切换 数值仿真 微控制器 电路仿真
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Simultaneous polarization separation and switching for 100-Gbps DP-QPSK signals in backbone networks
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作者 苏玉龙 冯欢 +7 位作者 胡辉 汪伟 段弢 王屹山 司金海 谢小平 杨合宁 黄新宁 《中国物理B:英文版》 SCIE EI CAS CSCD 2019年第2期299-305,共7页
We propose a novel scheme of simultaneous polarization separation and switching, based on the orthogonallypolarized four-wave mixing(FWM) effect, for ultra-high-speed polarization multiplexing(Pol-MUX) fiber networks ... We propose a novel scheme of simultaneous polarization separation and switching, based on the orthogonallypolarized four-wave mixing(FWM) effect, for ultra-high-speed polarization multiplexing(Pol-MUX) fiber networks such as 100-Gbps and 400-Gbps backbone networks. We use theoretical and experimental analysis of the vector theory of FWM to successfully achieve polarization separation and all-optical switching by utilizing a 100-Gbps dual polarizationquadrature phase shift keying(DP-QPSK) signal and two orthogonally-polarized pumps. Both of the polarization-separated QPSK signals have clear constellation diagrams, with root mean square(RMS) error vector magnitudes(EVMs) of 14.32%and 14.11% respectively. The wavelengths of idlers can be created at 30 different wavelengths, which are consistent with International Telecommunication Union-Telecommunication(ITU-T) wavelengths, by flexibly changing the wavelength of the pump light. Moreover, the idlers that have distinct wavelengths have power distributed in a range from-10 dBm to-15 dBm, which can support error-free transmission. The power penaltyis 5 d B lower than that of back-to-back(BTB)signal for both the X-and Y-polarization components measured at a bit error ratio(BER) of 3.8×10-3. Our experimental results indicate that this scheme has promising applications in future backbone networks. 展开更多
关键词 POLARIZATION SEPARATION and SWITCHING four-wave MIXING ORTHOGONAL POLARIZATION 100-Gbps dual polarization-quadrature phase shift keying
基于邻端口调度信息的反馈型两级交换结构
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作者 申志军 郭玉波 +2 位作者 高静 白云莉 李宏慧 《系统工程理论与实践》 EI CSSCI CSCD 北大核心 2019年第5期1308-1315,共8页
FTSA (feedback mechanism based two-stage switch architecture)对调度算法执行时间的限制过于苛刻使其优异的理论性能无法实现.针对这一问题,该文提出一种基于邻端口调度信息的反馈型两级交换结构AFTSA (adjacent-port scheduling in... FTSA (feedback mechanism based two-stage switch architecture)对调度算法执行时间的限制过于苛刻使其优异的理论性能无法实现.针对这一问题,该文提出一种基于邻端口调度信息的反馈型两级交换结构AFTSA (adjacent-port scheduling information and feedback mechanism based two-stage switch architecture), AFTSA引入前置反馈模式将目标缓存的状态数据提前反馈至输入端口;利用邻端口信息传输机制使得任意输入端口均能获得邻端口的调度结果;利用预处理机制修正调度算法所需要的基础信息;利用'裁决'模式的调度机制选择在下一时隙将要转发的信元.理论分析表明在相同的交换环境中AFTSA和FTSA具有等同的时延性能且能够为算法提供接近一个时隙的执行时间,AFTSA可有效提高两级交换结构的实践可行性. 展开更多
关键词 交换 反馈 负载均衡 调度算法
Coordination Control for a Class of Multi-Agent Systems Under Asynchronous Switching
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作者 ZHAO Xiaodan LIU Wenhui YANG Chunjie 《系统科学与复杂性学报:英文版》 SCIE EI CSCD 2019年第4期1019-1038,共20页
This paper studies the coordination control of nonlinear multi-agent systems under asynchronous switching,including consensus,tracking control,and containment.The asynchronous switching considered here means that the ... This paper studies the coordination control of nonlinear multi-agent systems under asynchronous switching,including consensus,tracking control,and containment.The asynchronous switching considered here means that the switching of the controller lags behind the mode’s switching for each agent.So the matched controller is interrupted by the delayed switching.For the situation,the authors give some new results by applying the conventional distributed control protocol.The authors show that all agents can achieve consensus.Secondly,the authors show that all followers can track the actual leader.Thirdly,the authors show that all followers will converge to the convex hull spanned by the dynamic leaders as time goes on.Numerical simulations are also provided and the results show highly consistent with the theoretical results. 展开更多
关键词 ASYNCHRONOUS switching CONSENSUS CONTAINMENT coordination CONTROL SWITCHED systems tracking CONTROL
Adaptive Numerical Approach for Optimal Control of a Single Train
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作者 WU Xiang ZHANG Kanjian CHENG Ming 《系统科学与复杂性学报:英文版》 SCIE EI CSCD 2019年第4期1053-1071,共19页
This paper considers the optimal control problem of a single train,which is formulated as an optimal control problem of nonlinear systems with switching controller.The switching sequence and the switching time are dec... This paper considers the optimal control problem of a single train,which is formulated as an optimal control problem of nonlinear systems with switching controller.The switching sequence and the switching time are decision variables to be chosen optimally.Generally speaking,it is very difficult to solve this problem analytically due to its nonlinear nature,the complexity of the controller,and the existence of system state and control input constraints.To obtain the numerical solution,by introducing binary functions for every value of the control input,relaxing the binary functions,and imposing a penalty function on the relaxation,the problem is transformed into a parameter optimization problem,which can be efficiently solved by using any gradient-based numerical approach.Then,the authors propose an adaptive numerical approach to solve this problem.Convergence results indicate that any optimal solution of the parameter optimization problem is also an optimal solution of the original problem.Finally,an optimal control problem of a single train illustrates that the adaptive numerical approach proposed by us is less time-consuming and obtains a better cost function value than the existing approaches. 展开更多
关键词 ADAPTIVE numerical approach nonlinear system optimal CONTROL SWITCHING CONTROLLER TRAIN CONTROL
Dissecting PCNA function with a systematically designed mutant library in yeast
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作者 Qingwen Jiang Weimin Zhang +3 位作者 Chenghao Liu Yicong Lin Qingyu Wu Junbiao Dai 《遗传学报:英文版》 SCIE CAS CSCD 2019年第6期301-313,共13页
Proliferating cell nuclear antigen (PCNA), encoded by POL30 in Saccharomyces cerevisiae, is a key component of DNA metabolism. Here, a library consisting of 304 PCNA mutants was designed and constructed to probe the c... Proliferating cell nuclear antigen (PCNA), encoded by POL30 in Saccharomyces cerevisiae, is a key component of DNA metabolism. Here, a library consisting of 304 PCNA mutants was designed and constructed to probe the contribution of each residue to the biological function of PCNA. Five regions with elevated sen sitivity to DNA damaging reagents were identified using high-throughput phe no type screening. Using a series of genetic and biochemical analyses, we demonstrated that one particular mutant, K168A, has defects in the DNA damage tolerance (DDT) pathway by disrupting the interaction between PCNA and Rad5. Subsequent domain analysis showed that the PCNA-Rad5 interaction is a prerequisite for the function of Rad5 in DDT. Our study not only provides a resource in the form of a library of versatile mutants to study the functions of PCNA, but also reveals a key residue on PCNA (K168) which highlights the importance of the PCNA-Rad5 interaction in the template switching (TS) pathway. 展开更多
关键词 MUTAGENESIS HIGH-THROUGHPUT DNA damage tolerance TEMPLATE switching GENETIC interaction
Code switching:definition and influencing factors 预览
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作者 曾熙然 《校园英语》 2019年第1期184-187,共4页
This essay will define and critic ally explore codeswitching.Different studies and models of code-switching will be discussed accordingly.Since both sociolinguistic and psycholinguistic approaches can be used to accou... This essay will define and critic ally explore codeswitching.Different studies and models of code-switching will be discussed accordingly.Since both sociolinguistic and psycholinguistic approaches can be used to account for contexts and grammatical constraints on code-switching,this essay will only focus on the sociolinguistic approach. 展开更多
关键词 CODE SWITCHING DEFINITION influencing FACTORS
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Applications of Serial-Parallel Compensated Resonant Topology in Wireless Charger System Used in Electric Vehicles 预览
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作者 付永升 雷鸣 +1 位作者 高磊磊 周刚 《东华大学学报:英文版》 EI CAS 2019年第1期15-22,共8页
There are lots of factors that can influence the wireless charging efficiency in practice, such as misalignment and air-gap difference, which can also change all the charging parameters. To figure out the relationship... There are lots of factors that can influence the wireless charging efficiency in practice, such as misalignment and air-gap difference, which can also change all the charging parameters. To figure out the relationship between those facts and system, this paper presents a serial-parallel compensated(SPC) topology for electric vehicle/plug-in hybrid electric vehicle(EV/PHEV) wireless charger and provides all the parameters changing with corresponding curves. An ANSYS model is built to extract the coupling coefficient of coils. When the system is works at constant output power, the scan frequency process can be applied to wireless power transfer(WPT) and get the resonant frequency. In this way, it could determine the best frequency for system to achieve zero voltage switching status and force the system to hit the maximum transmission efficiency. Then frequency tracking control(FTC) is used to obtain the highest system efficiency. In the paper, the designed system is rated at 500 W with 15 cm air-gap, the overall efficiency is 92%. At the end, the paper also gives the consideration on how to improve the system efficiency. 展开更多
关键词 wireless power transfer(WPT) zero voltage switching frequency tracking control(FTC) ELECTRIC vehicle/plug-in hybrid ELECTRIC vehicle(EV/PHEV)
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云广特高压交流滤波器投退控制逻辑缺陷分析及改进 预览
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作者 谭明 廖名洋 +1 位作者 石健 曾海涛 《电力电容器与无功补偿》 北大核心 2019年第3期29-33,40共6页
交流滤波器是±800 kV 云南广东特高压直流输电系统换流站内的重要设备,具有容量大、投退频繁的特点,其投退控制逻辑直接影响到直流输电系统的安全与稳定运行。文中分析了两起异常事件:热备用状态的小组滤波器异常投入导致交流母线... 交流滤波器是±800 kV 云南广东特高压直流输电系统换流站内的重要设备,具有容量大、投退频繁的特点,其投退控制逻辑直接影响到直流输电系统的安全与稳定运行。文中分析了两起异常事件:热备用状态的小组滤波器异常投入导致交流母线电压升高和小组滤波器刀闸不定义导致限功率,并讨论了最后线路断路器跳闸后已投入的小组滤波器无法自动切除问题。针对其中的控制逻辑缺陷提出了相应的改进建议和方案,为实际直流工程的设计和运行提供了参考。 展开更多
关键词 UHVDC 交流滤波器 投退 控制逻辑 改进
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Users Intention for Continuous Usage of Mobile News Apps: the Roles of Quality, Switching Costs, and Personalization
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作者 Qiongwei Ye Yumei Luo +3 位作者 Guoqing Chen Xunhua Guo Qiang Wei Shuyan Tan 《系统科学与系统工程学报:英文版》 SCIE EI CSCD 2019年第1期91-109,共19页
Mobile news apps have emerged as a significant means for learning about latest news and trends. However, in light of numerous news apps and information overload, motivating users to adopt one app is a major concern fo... Mobile news apps have emerged as a significant means for learning about latest news and trends. However, in light of numerous news apps and information overload, motivating users to adopt one app is a major concern for both the industry and academia. Therefore, considering the attributes of mobile news and the debate on switching costs in the Internet context, based on the expectation-confirmation model (ECM), this study suggests that switching costs still exist and have a significant moderating effect on user satisfaction and continuous usage of mobile news apps. Furthermore, the different influences of information quality, system quality and service quality on continuance intention, user satisfaction and switching costs are discussed, showing that quality of information has a significant impact on users’ continuous usage of mobile news apps through increasing perceived usefulness, whereas personalized service quality have stronger effects through increasing user satisfaction and switching costs. 展开更多
关键词 Personalized recommendation switching COSTS mobile news APPS expectation-confirmation model
H_∞ couple-group consensus of stochastic multi-agent systems with fixed and Markovian switching communication topologies
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作者 方木云 周灿灿 +2 位作者 黄鑫 李晓 周建平 《中国物理B:英文版》 SCIE EI CAS CSCD 2019年第1期313-322,共10页
The paper addresses the issue of H_∞ couple-group consensus for a class of discrete-time stochastic multi-agent systems via output-feedback control. Both fixed and Markovian switching communication topologies are con... The paper addresses the issue of H_∞ couple-group consensus for a class of discrete-time stochastic multi-agent systems via output-feedback control. Both fixed and Markovian switching communication topologies are considered. By employing linear transformations, the closed-loop systems are converted into reduced-order systems and the H_∞ couplegroup consensus issue under consideration is changed into a stochastic H_∞ control problem. New conditions for the mean-square asymptotic stability and H_∞ performance of the reduced-order systems are proposed. On the basis of these conditions, constructive approaches for the design of the output-feedback control protocols are developed for the fixed communication topology and the Markovian switching communication topologies, respectively. Finally, two numerical examples are given to illustrate the applicability of the present design approaches. 展开更多
关键词 multi-agent system couple-group CONSENSUS output FEEDBACK control switching TOPOLOGIES
Regenerative energy management of electric drive based on Lyapunov stability theorem 预览
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作者 Shahab SABZI Mehdi ASADI Hassan MOGHBELI 《现代电力系统与清洁能源学报(英文)》 CSCD 2019年第2期321-328,共8页
In recent years, urban rail systems have developed drastically. In these systems, when induction electrical machine suddenly brakes, a great package of energy is produced. This package of energy can be stored in energ... In recent years, urban rail systems have developed drastically. In these systems, when induction electrical machine suddenly brakes, a great package of energy is produced. This package of energy can be stored in energy storage devices such as battery, ultra-capacitor and flywheel. In this paper, an electrical topology is proposed to absorb regenerative braking energy and to store it in ultracapacitor and battery.Ultra-capacitor can deliver the stored energy to DC grid and charge the battery for auxiliary applications such as lighting and cooling systems The proposed system is modeled based on large signal averaged modeling, which leads to the simplicity of calculations. The control system is based on Lyapunov stability theorem which guarantees system stability. Also, an energy management algorithm is proposed to control energy under braking and steady-state conditions. Finally,the simulation results validate the effectiveness of the proposed control and energy management system. 展开更多
关键词 DC/DC CONVERTER LYAPUNOV stability BIDIRECTIONAL CONVERTER Energy management system(EMS) ULTRA-CAPACITOR Battery Switching function
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Stabilization for a Class of Discrete-time Switched Large-scale Systems with Parameter Uncertainties
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作者 Chang-Chun Sun 《国际自动化与计算杂志:英文版》 EI CSCD 2019年第4期543-552,共10页
The problem of robust stabilization for a class of discrete-time switched large-scale systems with parameter uncertainties and nonlinear interconnected terms is considered. By using state feedback and Lyapunov functio... The problem of robust stabilization for a class of discrete-time switched large-scale systems with parameter uncertainties and nonlinear interconnected terms is considered. By using state feedback and Lyapunov function technique, a decentralized switching control approach is put forward to guarantee the solutions of large-scale systems converge to the origin globally. A numerical example and a corresponding simulation result are utilized to verify the effectiveness of the presented approach. 展开更多
关键词 SWITCHED large-scale systems DISCRETE-TIME state FEEDBACK DECENTRALIZED control SWITCHING law
认知控制基本功能的神经机制
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作者 陈安涛 《生理学报》 CAS CSCD 北大核心 2019年第1期149-155,共7页
认知控制是指根据任务目标调控具体心理过程的大脑功能,构成了个体目标导向行为的基础。本研究团队多年来关注认知控制基本功能(监测、控制和转换)的神经机制,在监测启动认知控制的时间过程及其机制,控制的影响范围、新的控制机制、控... 认知控制是指根据任务目标调控具体心理过程的大脑功能,构成了个体目标导向行为的基础。本研究团队多年来关注认知控制基本功能(监测、控制和转换)的神经机制,在监测启动认知控制的时间过程及其机制,控制的影响范围、新的控制机制、控制效率的脑网络基础,转换的中枢脑区和动态神经编码等问题上取得了系列研究成果。本文对这些研究进展进行了综述,并进一步提炼了相应的理论意义。今后需要加强认知控制基本功能的因果性研究,开展认知控制功能表达研究和增强-迁移效应研究。 展开更多
关键词 认知控制 监测 控制 转换 事件相关电位 功能性磁共振成像
SRIO在高速信号处理系统中的应用分析 预览
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作者 杨磊 宋佳音 《信息与电脑》 2019年第4期94-95,共2页
笔者介绍了高速总线协议 RapidIO及其串行版本 SRIO协议,简述了高速信号处理系统中常用多核 DSPC6678的 SRIO模块,分析了 SRIO架构在嵌入式高速信号处理系统中的优势,并从应用场景,软硬件设计等方面分析了与其他几种高速总线协议PCI,Hyp... 笔者介绍了高速总线协议 RapidIO及其串行版本 SRIO协议,简述了高速信号处理系统中常用多核 DSPC6678的 SRIO模块,分析了 SRIO架构在嵌入式高速信号处理系统中的优势,并从应用场景,软硬件设计等方面分析了与其他几种高速总线协议PCI,HyperLink的异同。最后着重介绍了带有SRIO交换芯片CPS1848的复杂SRIO系统设计方案,并给出了简单的设计框图。 展开更多
关键词 C6678 SRIO 交换 信号处理
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5G Flexible Optical Transport Networks with Large-Capacity, Low-Latency and High-Efficiency 预览
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作者 Yuefeng Ji Jiawei Zhang +1 位作者 Yuming Xiao Zhen Liu 《中国通信:英文版》 SCIE CSCD 2019年第5期19-32,共14页
The fifth generation(5G) of mobile communications are facing big challenges, due to the proliferation of diversified terminals and unprecedented services such as internet of things(IoT), high-definition videos, virtua... The fifth generation(5G) of mobile communications are facing big challenges, due to the proliferation of diversified terminals and unprecedented services such as internet of things(IoT), high-definition videos, virtual/augmented reality(VR/AR). To accommodate massive connections and astonish mobile traffic, an efficient 5G transport network is required. Optical transport network has been demonstrated to play an important role for carrying 5G radio signals. This paper focuses on the future challenges, recent studies and potential solutions for the 5G flexible optical transport networks with the performances on large-capacity, low-latency and high-efficiency. In addition, we discuss the technology development trends of the 5G transport networks in terms of the optical device, optical transport system, optical switching, and optical networking. Finally, we conclude the paper with the improvement of network intelligence enabled by these technologies to deterministic content delivery over 5G optical transport networks. 展开更多
关键词 5G OPTICAL TRANSPORT NETWORKS OPTICAL devices OPTICAL TRANSPORT system OPTICAL SWITCHING OPTICAL NETWORKING
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Model reference adaptive control with smooth switching scheme for piecewise linear systems and its application in turbofan engine control
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作者 SUN Penghui WANG Xi +1 位作者 YANG Bei ZENG Detang 《航空动力学报》 EI CAS CSCD 北大核心 2019年第7期1615-1623,共9页
A model reference adaptive control(MRAC)with smooth switching scheme was proposed for piecewise linear systems,and the method was utilized in turbofan engine control to avoid the discontinuity of control input.In this... A model reference adaptive control(MRAC)with smooth switching scheme was proposed for piecewise linear systems,and the method was utilized in turbofan engine control to avoid the discontinuity of control input.In this scheme,each sub-region of the operating envelope had its own MRAC controller,and smooth indicator function based smooth switching scheme was introduced to switch multiple controllers smoothly at the boundary of adjacent sub-regions.The Lyapunov stability analysis indicated that the proposed smooth switching scheme can guarantee the convergence of the closed-loop system during the controllers switching.The tracking error system was converted into a switched system to analyze the global stability of the closed-loop system.The advantage of the method was that the chattering of system output and instability caused by asynchronous switching can be eliminated.The simulation illustrates the effectiveness of the proposed control scheme in comparison with the existing MRAC controller with gain scheduling for turbofan engine. 展开更多
关键词 model REFERENCE adaptive control TURBOFAN engine SMOOTH SWITCHING LYAPUNOV function DWELL time LYAPUNOV stability
双压缩机式的太阳能冷藏车制冷系统动力切换与控制策略 预览
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作者 徐胜楠 袁欣 《无线互联科技》 2019年第6期47-48,共2页
文章主要研究太阳能冷藏车制冷系统的动力切换与控制。对于采用双压缩机的太阳能冷藏车来说,面对不同的条件和工况,制冷系统能够切换不同的工作模式,以此实现太阳能的最大利用率和各动力来源协同工作的策略研究是非常有必要的。文章首先... 文章主要研究太阳能冷藏车制冷系统的动力切换与控制。对于采用双压缩机的太阳能冷藏车来说,面对不同的条件和工况,制冷系统能够切换不同的工作模式,以此实现太阳能的最大利用率和各动力来源协同工作的策略研究是非常有必要的。文章首先,介绍了冷藏车和光伏发电技术的发展前景,其次,阐述了采用双压缩机的太阳能冷藏车制冷系统的结构和工作原理,通过分析其制冷系统的直接动力来源,指出其存在的不足。最后,针对制冷系统的动力来源,提出4种切换模式和相应的控制流程。 展开更多
关键词 太阳能冷藏车 制冷系统 切换 控制
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