一种共总线多主系统的通用仲裁方法

本文是关于共总线多主处理器系统设计的文章,着重介绍了一种通用的、可靠的、而且结构简单的仲裁原理及电路设计,这种仲裁方法使各主CPU板具有同样的优先权,并且支持处理器的数目几乎不受限制。

多主系统在高速信号处理中的应用

当前,数字信号处理(DSP)正从理论研究转向实际应用阶段,由于高速信号处理器的出现,使得复杂的DSP算法可以在实时环境中得以应用。因此,自高速信号处理器问世至今8年以来,信号处理的应用课题已大范围地展开,并已在国内外科技界获得可喜的成果。高速信号处理所涉及的应用领域极其广泛,它包括有图像处理,语音处理,通信工程,振动噪声,生物医学,地震分析,机器人,高速控制等等。在这广泛的应用领域中,利用高速信号处理器作为运算部件以实现复杂算法的计算,这点现在已可完成。但是要把这些技术成果真正应用到工程中去,则必须考虑什么样的系统结构才能满足实际信号处理工程的要求。

有限理性下广义多目标多主多从博弈受控系统解的稳定性

该文在有限理性条件下,构建了一类新的广义多目标多主多从博弈受控系统,并给出了该博弈受控系统解的存在性条件.进一步,利用非线性标量化方法构造了适当的理性函数,并证明了该模型是结构稳定的,同时对ε-平衡也是鲁棒的,即在Baire分类意义下,大多数广义多目标多主多从博弈受控系统问题都是稳定的,表明在一定条件下该模型的精确解可用有限理性条件下的近似解逼近.

RS485总线通信双机监控程序的设计及应用

RS485总线是工控领域常用的一项总线技术,由于其结构简单、通信速率高、传输距离远等优点,特别适用于中小型DCS和监控系统。但是RS485的总线机制只允许存在一台主设备对其进行数据访问,要采用双机系统或多机系统提高监控系统的可靠性就必须使用特殊的解决方式。已有的解决方式可采用双机热备或增加一台双机切换模块,但都有一定的缺陷。从问题的根本着手,通过改编设备驱动程序来解决双机监控的问题,拓宽了解决问题的思路,节省了系统开支,并提高了系统的可靠性和稳定性。

Diversity of parasitic cuckoos and their hosts in China

In this exposé we provide the first review of host use by brood parasitic cuckoos in a multiple-cuckoo system in China, based on our own long-term field data and a compilation of observations obtained from the literature. In total, we found that 11 species of cuckoos utilized altogether 55 host species. These hosts belong to 15 families, in which Sylviidae, Turdidae and Timaliidae account for 22.6%, 20.8% and 17.0% of parasitism records, respectively. The Common Cuckoo (Cuculus canorus) had the widest range of host species, accounting for 45.5% of the total number of parasitized species (25 in 10 families) of all parasitism records and is the most frequent brood parasite in the country. Cuckoo species differed in their egg coloration and the extent of egg polymorphism with most of them, e.g. the Common Cuckoo, the Lesser Cuckoo (C. poliocephalus) and the Plaintive Cuckoo (Cacomantis merulinus) laying well mimetic eggs with respect to their hosts based on human being’s visual observations, while others such as the Large Hawk-cuckoo (C. sparverioides), the Himalayan Cuckoo (C. saturatus) and the Asian Emerald Cuckoo (Chrysococcyx maculatus) usually laid non-mimetic eggs. The use of cuckoo hosts and egg color variation in China are compared with those in other parts of their ranges in Asia.

软件无线电中的多主DSP系统结构

本文讨论了现有无线电通信的主要问题。介绍了软件无线电的概念，分析了软件无线电的基本原理，主要特征和体系结构。提出并讨论了能满足软件无线电需求的多主DSP系统结构。

Active vibration control of multibody system with quick startup and brake based on active damping

A kind of active vibration control method was presented based on active damping and optimization design for driving load of multibody system with quick startup and brake. Dynamical equation of multibody system with quick startup and brake and piezoelectric actuators intelligent structure was built. The optimum driving load was calculated by applying the presented method. The self-sensing and self-tuning closed-loop active vibration control in quick startup and brake process was realized. The control algorithm, using local velocity negative feedback, i.e. the output of a sensor only affects the output of the actuator collocated, can induce damping effectively to actively suppress the system vibration. Based on the optimization design for driving load of multibody system with quick startup and bake, the active damping of piezoelectric actuators intelligent structure was used to farther suppress the vibration of system. Theoretical analysis and calculation of numerical show that the proposed method makes the vibration of system decrease more than the optimal design method for driving load of multibody system.

Optimal design method for force in vibration control of multi-body system with quick startup and brake

A kind of active vibration control method was presented through optimal design of driving load of multi-body system with quick startup and brake. Dynamical equation of multi-body system with quick startup and brake was built, and mathematical model of representing vibration control was also set up according to the moving process from startup to brake. Then optimization vibration control model of system driving load was founded by applying theory of optimization control, which takes rigid body moving variable of braking moment as the known condition, and vibration control equation of multi-body system with quick startup and brake was converted into boundary value problem of differential equation. The transient control algorithm of vibration was put forward, which is the analysis basis for the further research. Theoretical analysis and calculation of numerical examples show that the optimal design method for the multi-body system driving load can decrease the vibration of system with duplication.

Multi-agent reinforcement learning with cooperation based on eligibility traces

The application of reinforcement learning is widely used by multi-agent systems in recent years. An agent uses a multi-agent system to cooperate with other agents to accomplish the given task, and one agent′s behavior usually affects the others′ behaviors. In traditional reinforcement learning, one agent takes the others location, so it is difficult to consider the others′ behavior, which decreases the learning efficiency. This paper proposes multi-agent reinforcement learning with cooperation based on eligibility traces, i.e. one agent estimates the other agent′s behavior with the other agent′s eligibility traces. The results of this simulation prove the validity of the proposed learning method.

Multi-objective optimization of active steering system with force and displacement coupled control

A novel active steering system with force and displacement coupled control(the novel AFS system) was introduced,which has functions of both the active steering and electric power steering.Based on the model of the novel AFS system and the vehicle three-degree of freedom system,the concept and quantitative formulas of the novel AFS system steering performance were proposed.The steering road feel and steering portability were set as the optimizing targets with the steering stability and steering portability as the constraint conditions.According to the features of constrained optimization of multi-variable function,a multi-variable genetic algorithm for the system parameter optimization was designed.The simulation results show that based on parametric optimization of the multi-objective genetic algorithm,the novel AFS system can improve the steering road feel,steering portability and steering stability,thus the optimization method can provide a theoretical basis for the design and optimization of the novel AFS system.

SOFT CONTROL ON COLLECTIVE BEHAVIOR OF A GROUP OF AUTONOMOUS AGENTS BY A SHILL AGENT

This paper asks a new question： how can we control the collective behavior of self-organized multi-agent systems？ We try to answer the question by proposing a new notion called ＇Soft Control＇ which keeps the local rule of the existing agents in the system. We show the feasibility of soft control by a case study. Consider the simple but typical distributed multi-agent model proposed by Vicsek et al. for flocking of birds： each agent moves with the same speed but with different headings which are updated using a local rule based on the average of its own heading and the headings of its neighbors. Most studies of this model are about the self-organized collective behavior, such as synchronization of headings. We want to intervene in the collective behavior （headings） of the group by soft control. A specified method is to add a special agent, called a ＇Shill＇, which can be controlled by us but is treated as an ordinary agent by other agents. We construct a control law for the shill so that it can synchronize the whole group to an objective heading. This control law is proved to be effective analytically and numerieally. Note that soft control is different from the approach of distributed control. It is a natural way to intervene in the distributed systems. It may bring out many interesting issues and challenges on the control of complex systems.

Archaeal viruses-novel,diverse and enigmatic

Recent research has revealed a remarkable diversity of viruses in archaeal-rich environments where spindles, spheres, fila- ments and rods are common, together with other exceptional morphotypes never recorded previously. Moreover, their dou- ble-stranded DNA genomes carry very few genes exhibiting homology to those of bacterial and eukaryal viruses. Studies on viral life cycles are still at a preliminary stage but important insights are being gained especially from microarray analyses of viral transcripts for a few model virus-host systems. Recently, evidence has been presented for some exceptional archaeal- nspecific mechanisms for extra-cellular morphological development of virions and for their cellular extrusion. Here we sum- marise some of the recent developments in this rapidly developing and exciting research area.

Linguistic Diversity in Trans-cultural Communication

The transcultural communication that characterizes our times needs to be carried out in a few commonly shared languages and this requirement has sharpened the awareness about uneven language status. While defenders of minor languages frequently make use of such concepts as ecosystem, human rights, capital, power, imperialism, etc. To express alarm at the spread of the English language in the present world, researchers tend to forget that these concepts applied to languages are only metaphors which, taken at their face value, would conceal the non- exclusive nature of language as a communicative instrument. A question is raised as to whether we should go beyond an essentially nationalist perception of language inherited from the nineteenth century.