Cross-training is a phenomenon related to motor learning, where motor performance of the untrained limb shows improvement in strength and skill execution following unilateral training of the homologous contralateral l...Cross-training is a phenomenon related to motor learning, where motor performance of the untrained limb shows improvement in strength and skill execution following unilateral training of the homologous contralateral limb. We used functional MRI to investigate whether motor performance of the untrained limb could be improved using a serial reaction time task according to motor sequential learning of the trained limb, and whether these skill acquisitions led to changes in brain activation patterns. We recruited 20 right-handed healthy subjects, who were randomly allocated into training and control groups. The training group was trained in performance of a serial reaction time task using their non-dominant left hand, 40 minutes per day, for 10 days, over a period of 2 weeks. The control group did not receive training. Measurements of response time and percentile of response accuracy were performed twice during pre- and post-training, while brain functional MRI was scanned during performance of the serial reaction time task using the untrained right hand. In the training group, prominent changes in response time and percentile of response accuracy were observed in both the untrained right hand and the trained left hand between pre- and post-training. The control group showed no significant changes in the untrained hand between pre- and post-training. In the training group, the activated volume of the cortical areas related to motor function （i.e., primary motor cortex, premotor area, posterior parietal cortex） showed a gradual decrease, and enhanced cerebellar activation of the vermis and the newly activated ipsilateral dentate nucleus were observed during performance of the serial reaction time task using the untrained right hand, accompanied by the cross-motor learning effect. However, no significant changes were observed in the control group. Our findings indicate that motor skills learned over the 2-week training using the trained limb were transferred to the opposite homologous limb, and motor skill acquisition of the untrained limb led to changes in brain activation patterns in the cerebral cortex and cerebellum.展开更多
随着基于电影和电视工程师协会(The Society of Motion Picture and Television Engineers,SMPTE)ST 2110标准的网际互连协议(Internet Protocol,IP)化电视系统越来越多,传统串行数字接口(Serial Digital Interface,SDI)架构电视系统测...随着基于电影和电视工程师协会(The Society of Motion Picture and Television Engineers,SMPTE)ST 2110标准的网际互连协议(Internet Protocol,IP)化电视系统越来越多,传统串行数字接口(Serial Digital Interface,SDI)架构电视系统测量方法在IP化电视系统中已不再适用。对此,详细介绍IP测量与SDI测量的区别与联系,以及IP架构电视系统测量的内容、方法及相关指标,以期在IP化电视系统出现问题时,能够通过相关测量,快速定位、解决系统故障。展开更多
针对具备Andriod和Windows双系统的电子设备在使用通用串行总线(Universal Serial Bus,USB)接口与外设通信时出现的需重新插拔USB外设、切换后USB设备不识别率偏高等问题,通过对电路进行分析和设计优化,提出一种电源管理电路的参数取值...针对具备Andriod和Windows双系统的电子设备在使用通用串行总线(Universal Serial Bus,USB)接口与外设通信时出现的需重新插拔USB外设、切换后USB设备不识别率偏高等问题,通过对电路进行分析和设计优化,提出一种电源管理电路的参数取值计算方法。采用VL817、TUSB522P及FSUSB74芯片设计3路智能USB 3.0电路方案,通过HUB硬复位重置、D+/D-、SSTX/SSRX信号通道复用输入输出(Input Output,IO)控制以及时序控制USB设备切换顺序的方法,提高系统的抗干扰能力。实测数据显示,应用该电路系统后运行稳定,系统切换时USB外设的识别成功率显著高于同类产品,契合大规模产业化设计及应用需求。展开更多
In order to solve the problem of artificial generation and low efficiency of test sequences for zone controller (ZC), a model-based automatic generation method of test sequence is proposed. Firstly, the timed automata...In order to solve the problem of artificial generation and low efficiency of test sequences for zone controller (ZC), a model-based automatic generation method of test sequence is proposed. Firstly, the timed automata model is established based on function analysis of the zone controller, and the correctness of the model is verified by UPPAAL. Then by parsing the timed automata model files, state information and transition conditions can be extracted to generate test case sets. Finally, according to the serialization conditions of test cases, the test cases are serialized into test sequences by using the improved depth first search algorithm. A case, the ZC controls the train running within its jurisdiction, shows that the method is correct and can effectively improve the efficiency of test sequence generation.展开更多
Present a kind of method which is used to communicate between serial serial port and peripheral equipment dynamicly and real-time using multithreading technique based on the basic principle of communication and multit...Present a kind of method which is used to communicate between serial serial port and peripheral equipment dynamicly and real-time using multithreading technique based on the basic principle of communication and multitasking mechanism in the circumstance of Windows. This method resolves the question of Real-time answering in the serial communication validly, reduces losing rate of data and improves reliability of system. This article presents a general method used in the serial communication which is practical.展开更多
A generalized antithetic time series theory for exponentially derived antithetic random variables is developed. The correlation function between a generalized gamma distributed random variable and its pth exponent is ...A generalized antithetic time series theory for exponentially derived antithetic random variables is developed. The correlation function between a generalized gamma distributed random variable and its pth exponent is derived. We prove that the correlation approaches minus one as the exponent approaches zero from the left and the shape parameter approaches infinity.展开更多
Physicists experimentalists use many observations of a phenomenon, which are the unknown equations that describe it, in order to understand the dynamics and obtain information on their future behavior. In this article...Physicists experimentalists use many observations of a phenomenon, which are the unknown equations that describe it, in order to understand the dynamics and obtain information on their future behavior. In this article we study the possibility of reproducing the dynamics of the phenomenon using only a measurement scale. The Whitney immersion theorem ideas are presented and generalization of Sauer for fractal sets to rebuild the asymptotic behavior of the phenomena and to investigate evidence of nonlinear dynamics in the reproduced dynamics using the Brock, Dechert, Scheinkman test (BDS). The applications are made in the financial market which are only known stock prices.展开更多
基金supported by the Yeungnam College of Science & Technology Research Grants in 2012
文摘Cross-training is a phenomenon related to motor learning, where motor performance of the untrained limb shows improvement in strength and skill execution following unilateral training of the homologous contralateral limb. We used functional MRI to investigate whether motor performance of the untrained limb could be improved using a serial reaction time task according to motor sequential learning of the trained limb, and whether these skill acquisitions led to changes in brain activation patterns. We recruited 20 right-handed healthy subjects, who were randomly allocated into training and control groups. The training group was trained in performance of a serial reaction time task using their non-dominant left hand, 40 minutes per day, for 10 days, over a period of 2 weeks. The control group did not receive training. Measurements of response time and percentile of response accuracy were performed twice during pre- and post-training, while brain functional MRI was scanned during performance of the serial reaction time task using the untrained right hand. In the training group, prominent changes in response time and percentile of response accuracy were observed in both the untrained right hand and the trained left hand between pre- and post-training. The control group showed no significant changes in the untrained hand between pre- and post-training. In the training group, the activated volume of the cortical areas related to motor function （i.e., primary motor cortex, premotor area, posterior parietal cortex） showed a gradual decrease, and enhanced cerebellar activation of the vermis and the newly activated ipsilateral dentate nucleus were observed during performance of the serial reaction time task using the untrained right hand, accompanied by the cross-motor learning effect. However, no significant changes were observed in the control group. Our findings indicate that motor skills learned over the 2-week training using the trained limb were transferred to the opposite homologous limb, and motor skill acquisition of the untrained limb led to changes in brain activation patterns in the cerebral cortex and cerebellum.
文摘随着基于电影和电视工程师协会(The Society of Motion Picture and Television Engineers,SMPTE)ST 2110标准的网际互连协议(Internet Protocol,IP)化电视系统越来越多,传统串行数字接口(Serial Digital Interface,SDI)架构电视系统测量方法在IP化电视系统中已不再适用。对此,详细介绍IP测量与SDI测量的区别与联系,以及IP架构电视系统测量的内容、方法及相关指标,以期在IP化电视系统出现问题时,能够通过相关测量,快速定位、解决系统故障。
文摘针对具备Andriod和Windows双系统的电子设备在使用通用串行总线(Universal Serial Bus,USB)接口与外设通信时出现的需重新插拔USB外设、切换后USB设备不识别率偏高等问题,通过对电路进行分析和设计优化,提出一种电源管理电路的参数取值计算方法。采用VL817、TUSB522P及FSUSB74芯片设计3路智能USB 3.0电路方案,通过HUB硬复位重置、D+/D-、SSTX/SSRX信号通道复用输入输出(Input Output,IO)控制以及时序控制USB设备切换顺序的方法,提高系统的抗干扰能力。实测数据显示,应用该电路系统后运行稳定,系统切换时USB外设的识别成功率显著高于同类产品,契合大规模产业化设计及应用需求。
文摘In order to solve the problem of artificial generation and low efficiency of test sequences for zone controller (ZC), a model-based automatic generation method of test sequence is proposed. Firstly, the timed automata model is established based on function analysis of the zone controller, and the correctness of the model is verified by UPPAAL. Then by parsing the timed automata model files, state information and transition conditions can be extracted to generate test case sets. Finally, according to the serialization conditions of test cases, the test cases are serialized into test sequences by using the improved depth first search algorithm. A case, the ZC controls the train running within its jurisdiction, shows that the method is correct and can effectively improve the efficiency of test sequence generation.
文摘Present a kind of method which is used to communicate between serial serial port and peripheral equipment dynamicly and real-time using multithreading technique based on the basic principle of communication and multitasking mechanism in the circumstance of Windows. This method resolves the question of Real-time answering in the serial communication validly, reduces losing rate of data and improves reliability of system. This article presents a general method used in the serial communication which is practical.
文摘A generalized antithetic time series theory for exponentially derived antithetic random variables is developed. The correlation function between a generalized gamma distributed random variable and its pth exponent is derived. We prove that the correlation approaches minus one as the exponent approaches zero from the left and the shape parameter approaches infinity.
文摘Physicists experimentalists use many observations of a phenomenon, which are the unknown equations that describe it, in order to understand the dynamics and obtain information on their future behavior. In this article we study the possibility of reproducing the dynamics of the phenomenon using only a measurement scale. The Whitney immersion theorem ideas are presented and generalization of Sauer for fractal sets to rebuild the asymptotic behavior of the phenomena and to investigate evidence of nonlinear dynamics in the reproduced dynamics using the Brock, Dechert, Scheinkman test (BDS). The applications are made in the financial market which are only known stock prices.
