Dynamic memory paravirtualization transparent to guest OS

This paper introduces dynamic paravirtualization, which imitates paravirtualization and aims at reducing VM exits of full virtualization with hardware support. In dynamic paravirtualization, VMM (virtual machine monitor) dynamically monitors and replaces the hot instructions, which cause most VM exits. It is transparent to the guest OS such that the legacy OSes can benefit from this optimization. Our study focuses on reducing the overhead of memory virtualization—dynamic memory paravirtualization (DMP). We ...     

Towards evolvable Internet architecture-design constraints and models analysis

There is a general consensus about the success of Internet architecture in academia and industry. However, with the development of diversified application, the existing Internet architecture is facing more and more challenges in scalability, security, mobility and performance. A novel evolvable Internet architecture framework is proposed in this paper to meet the continuous changing application requirements. The basic idea of evolvability is relaxing the constraints that limit the development of the architecture while adhering to the core design principles of the Internet. Three important design constraints used to ensure the construction of the evolvable architecture, including the evolvability constraint, the economic adaptability constraint and the manageability constraint, are comprehensively described. We consider that the evolvable architecture can be developed from the network layer under these design constraints. What＇s more, we believe that the address system is the foundation of the Internet. Therefore, we propose a general address platform which provides a more open and efficient network environment for the research and development of the evolvable architecture.     

单端输出的机顶盒开关电源设计

在介绍了TOP Switch芯片的原理及特点的基础上．使用该芯片并通过对开关电源关键部件高频开关变压器中相关参数的计算设汁出了一种单端输出的机顶盒开关电源．给出了该电源在使用时的相关技术指标．为TOP Switch芯片在开关电源中的应用提供了理论和实验依据．     

乒乓球机器人的视觉伺服系统

视觉伺服的乒乓球机器人系统作为典型的"手眼系统",是研究高速视觉感知和快速伺服运动的理想平台,其涉及的高速物体识别跟踪、快速精确轨迹预测及机械臂伺服准确回球等关键技术在工业、军事等领域有广泛的应用前景.本文提出了乒乓球机器人的高速视觉伺服系统实现方法,包括基于特征直方图统计和快速轮廓搜索的目标识别算法,基于模型参数学习和自适应模型调整的物体运动状态估计和轨迹预测算法,及基于轨迹预测的灵巧臂回球规划算法.通过实验验证了各算法的实时性和高效性,并在165cm高的仿人机器人"悟"和"空"上成功实现了双机器人对打和与人对打任务.     

裁剪机裁刀的控制

分析了裁刀的实际复杂受力情况,对裁刀纠偏问题进行了详细的讨论,并采用模糊控制的方法,处理刀具在不同受力情况下裁刀偏转角度的问题。     

Theoretical calculation and experimental study of influence of oxygen vacancy on the electronic structure and hemocompatibility of rutile TiO2

In this work, the relationship between electronic structure and hemocompatibility of oxygen deficient rutile TiO_2?x was studied by both theoretical calculation and experimental study. Based on the local density functional theory, first-principals method was performed to calculate the electronic structure of rutile TiO₂ with different oxygen vacancy concentration. In the range of less than 10% of (or equal) physically realistic O vacancy concentration, the band gap of rutile TiO₂ increases with increasing O vacancy concentration, leading the TiO₂ changes from a p-type to an n-type semiconductor. The valance band of TiO₂ is predominated by O 2p orbital, while the conduction band is occupied by Ti 3d orbital for different O vacancy concentration. The O vacancy results in the occupation of electrons at the bottom of conduction band of TiO₂, and the donor density increases with increasing O vacancy concentration. When materials come in contact with blood, the n-type semiconductor feature of oxygen deficient TiO_2?x with the bottom of conduction band occupied by electrons would prevent charge transfer from fibrinogen into the surface of materials, thus inhibiting the aggregation and activation of platelets, therefore improving the hemocompatibility of rutile TiO_2-x .

     

基于Agent的计算机考试系统的设计与实现

Agent技术为分布式开放系统的分析、设计和实现提供了一种新方法。针对原考试系统的局限性,引入A- gent思想进行重新设计,实现了基于Agent的计算机考试系统。通过新的设计,将远程交互转化成本地交互,减少了对网络带宽的占用,提高了系统的响应速度和可靠性。     

一种基于DSC无刷直流电机无传感器新控制方法

介绍了一种基于DSC（数字信号控制器）无刷直流电机无传感器新控制方法，包括工作原理和系统组成。     

大棚果蔗--蔬菜一年两熟高效栽培技术

本文主要论述标准钢架大棚果蔗、蔬菜一年两熟栽培技术模式。利用钢架大棚进行果蔗-冬莴苣，果蔗-冬萝卜一年两熟栽培，大棚种果蔗比露地种果蔗提前上市30多天，比大棚单种果蔗增加产值30％～40％，通过大棚蔬菜品种的合理搭配，大大提高大棚土地利用率。年总产值达13．5～15万元／hm^2。     

关于电梯接地系统的检测方法

电梯的接地系统主要是指机房控制柜、线槽、主机、限速器、轿厢、层门等重要部件与接地装置的连接系统，而这些部件的接地线一般都汇总在机房电源的接地总线上。因此，机房电源接地总线的接地电阻便能代表电梯的接地电阻。所谓接地电阻主要是指接地体电阻、接地线电阻及周围土壤流散电阻3部分之和，其中周围土壤流散电阻变化很大，它跟周围的土质、温湿度有关。目前，电梯接地系统的检测方法主要有以下2种。