Adapting grid computing environments dependable with virtual machines: design, implementation, and evaluations

Due to its potential, using virtual machines in grid computing is attracting increasing attention. Most of the researches focus on how to create or destroy a virtual execution environments for different kinds of applications, while the policy of managing the virtual environments is not widely discussed. This paper proposes the design, implementation, and evaluation of an adaptive and dependable virtual execution environment for grid computing, ADVE, which focuses on the policy of managing virtual machines in grid environments. To build a dependable virtual execution environments for grid applications, ADVE provides an set of adaptive policies managing virtual machine, such as when to create and destroy a new virtual execution environment, when to migrate applications from one virtual execution environment to a new virtual execution environment. We conduct experiments over a cluster to evaluate the performance of ADVE, and the experimental results show that ADVE can improve the throughput and the reliability of grid resources with the adaptive management of virtual machines.     

VMStore: Distributed storage system for multiple virtual machines

Desktop virtualization is a very hot concept in both industry and academic communities. Since virtualized desktop system is based on multiple virtual machines (VM), it is necessary to design a distributed storage system to manage the VM images. In this paper, we design a distributed storage system, VMStore, by taking into account three important characteristics: high performance VM snapshot, booting optimization from multiple images and redundancy removal of images data. We adopt a direct index structure of...     

Internet-based virtual computing environment(iVCE):Concepts and architecture

Resources over Internet have such intrinsic characteristics as growth, autonomy and diversity, which have brought many challenges to the efficient sharing and comprehensive utilization of these resources. This paper presents a novel approach for the construction of the Internet-based Virtual Computing Environment (iVCE), whose sig- nificant mechanisms are on-demand aggregation and autonomic collaboration. The iVCE is built on the open infrastructure of the Internet and provides harmonious, transparent and integrated services for end-users and applications. The concept of iVCE is presented and its architectural framework is described by introducing three core concepts, i.e., autonomic element, virtual commonwealth and virtual executor. Then the connotations, functions and related key technologies of each components of the architecture are deeply analyzed with a case study, iVCE for Memory.     

发动机性能虚拟仪器测试系统设计

本发动机性能虚拟仪器测试系统采用的是美国国家仪器公司(National Instruments,NI)的LabVIEW和LabVIEW RT虚拟仪器软件平台,以及配套的NI PCI数据采集板卡、NI SCXI信号调理设备和NI compact FieldPoint(cFP)分布式I/O实时系统硬件.实现了多路性能的并行测试;并可根据用户设置,自动完成负载、扭矩、转速、功率、压力以及温度的实时监控;最后通过TCP/IP协议实现了测试数据的远程共享,和用户对测试系统的远程操控.该系统具有开发周期短、使用效率高及成本低廉的特点,同时具有很强的系统可扩展性和可重用性,具有很强的应用价值.     

Robust and fast visual tracking for a ball and plate control system: design,implementation and experimental verification

Multimedia Tools and Applications - The ball and plate System (BPS) is a two-dimensional electromechanical system with multiple variables, non-linearity and strong coupling. The BPS control problem...     

分光计三维虚拟系统的设计与实现

选择分光计的调节与使用作为实施案例,具体探讨以虚拟现实技术为主的三维虚拟学习环境的系统功能划分、以学习者为中心的系统设计原则、以及交互行为的编程实现,探索虚拟现实技术在教学领域的应用.     

The design and realization of CoViD: a system for collaborative virtual 3D design

Many important decisions in the design process are made during fairly early on, after designers have presented initial concepts. In many domains, these concepts are already realized as 3D digital models. Then, in a meeting, the stakeholders for the project get together and evaluate these potential solutions. Frequently, the participants in this meeting want to interactively modify the proposed 3D designs to explore the design space better. Today’s systems and tools do not support this, as computer systems typically support only a single user and computer-aided design tools require significant training. This paper presents the design of a new system to facilitate a collaborative 3D design process. First, we discuss a set of guidelines which have been introduced by others and that are relevant to collaborative 3D design systems. Then, we introduce the new system, which consists of two main parts. The first part is an easy-to-use conceptual 3D design tool that can be used productively even by naive users. The tool provides novel interaction techniques that support important properties of conceptual design. The user interface is non-obtrusive, easy-to-learn, and supports rapid creation and modification of 3D models. The second part is a novel infrastructure for collaborative work, which offers an interactive table and several large interactive displays in a semi-immersive setup. It is designed to support multiple users working together. This infrastructure also includes novel pointing devices that work both as a stylus and a remote pointing device. The combination of the (modified) design tool with the collaborative infrastructure forms a new platform for collaborative virtual 3D design. Then, we present an evaluation of the system against the guidelines for collaborative 3D design. Finally, we present results of a preliminary user study, which asked naive users to collaborate in a 3D design task on the new system.     

一个面向虚拟网络拓扑发现系统的设计与实现

伴随当前虚拟化技术的成熟及应用,很多企业和单位开始尝试应用虚拟化技术,因此,对部门内部虚拟网络高效管理的需求变得尤为突出,而网络拓扑信息又是网络管理的先决条件,在对目前网络拓扑自动发现技术深入分析研究的基础上,本文设计并实现了一个面向虚拟网络的物理拓扑自动发现系统,它综合了多种拓扑发现机制和技术的优势,具有设计复杂度低,发现拓扑结构快速和完整的特点。     

虚拟检修系统的设计与实现

提出了网络虚拟检修系统的主要功能与组成部分，并以完整的DVD视盘机为例，给出了家用电器虚拟检修系统的软件结构与实现技术，系统的作用相当于是原理教学与实物实验的桥梁与补充，是实验教学的重要辅助手段，一方面可以大大提高实验效率和效果，另一方面能更好地完善实验教学的结构。     

虚拟EAST系统的设计与实现

虚拟EAST系统能三维再现EAST装置,并提供360度全方位浏览EAST内部结构及点击访问相关信息的功能.交互式虚拟EAST的建立使用了3ds Max和虚拟现实建模语言(VRML)技术,3ds Max提供了良好的可视化开发环境,可以利用其产生高质量的3D模型;VRML是Web上建立三维虚拟模型的标准语言,可以构造虚拟场景并实现用户与虚拟场景的互动.初步构建了虚拟EAST系统,可以动态交互地再现EAST装置,为全面虚拟EAST的三维物理实验建立了基础.     

On study of design and implementation of virtual fixtures

Virtual fixtures (VFs) can be defined as guiding constraints designed to enhance or assist human performance in a computer-controlled system by providing cues of haptic or audiovisual nature. In this paper we present a new characterization of VFs based on mechanics, and provide a set practical guidelines for the designers of such fixtures from a software architecture point of view. We propose an event-driven approach that facilitates the integration of these guiding constraints in a scene graphed-based environment. In this context some novel implementation of VFs are presented, where users may interact with a single or an assembled set of fixtures. We present two types of force attributes for VF and present their implications in a trajectory-following problem.     

动车组转向架虚拟仿真系统设计与实现

动车组转向架结构的复杂性,使得传统的培训模式已不能满足检修人员短时间内快速掌握检修技能的要求。针对CRH5动车组转向架的结构特点和功能,采用虚拟现实、多媒体和仿真技术,设计实现了动车组转向架虚拟仿真系统,可以清晰地表达转向架的技术信息、结构特点、安装顺序以及工艺要求等。详细介绍了该系统设计实现的关键技术和方法。实际应用表明,该系统不仅为动车组转向架的维护和人员培训提供了一个可视化的多媒体信息平台,也为其他场合的交流提供了直观的沟通方式。     

Dimensional and geometrical errors of three-axis CNC milling machines in a virtual machining system

Virtual machining systems are applying computers and different types of software in manufacturing and production in order to simulate and model errors of real environment in virtual reality systems. Many errors of CNC machine tools have an effect on the accuracy and repeatability of part manufacturing. Some of these errors can be reduced by controlling the machining process and environmental parameters. However geometrical errors which have a big portion of total error need more attention. In this paper a virtual machining system which simulates the dimensional and geometrical errors of real three-axis milling machining operations is described. The system can read the machining codes of parts and enforce 21 errors associated with linear and rotational motion axes in order to generate new codes to represent the actual machining operation. In order to validate the system free form profiles and surfaces of virtual and real machined parts are compared in order to present the reliability and accuracy of the software.     

P-smart—a virtual system for clothing thermal functional design

This paper presents a virtual CAD system developed for clothing thermal functional design and simulation. It allows designers and engineers in virtual space to design and preview the thermal functional performance of clothing and gives feedback to improve the design iteratively. The system provides designers with an effective tool for designing and engineering clothing to achieve superior thermal functional performance.     

Splitting cubes: a fast and robust technique for virtual cutting

This paper presents the splitting cubes, a fast and robust technique for performing interactive virtual cutting on deformable objects. The technique relies on two ideas. The first one is to embed the deformable object in a regular grid, to apply the deformation function to the grid nodes and to interpolate the deformation inside each cell from its 8 nodes. The second idea is to produce a tessellation for the boundary of the object on the base of the intersections of such boundary with the edges of the grid. Please note that the boundary can be expressed in any way; for example it can be a triangle mesh, an implicit or a parametric surface. The only requirement is that the intersection between the boundary and the grid edges can be computed. This paper shows how the interpolation of the deformation inside the cells can be used to produce discontinuities in the deformation function, and the intersections of the cut surface can be used to visually show the cuts on the object. The splitting cubes is essentially a tessellation algorithm for growing, deformable surface, and it can be applied to any method for animating deformable objects. In this paper the case of the mesh-free methods (MMs) is considered: in this context, we described a practical GPU friendly method, that we named the extended visibility criterion, to introduce discontinuities of the deformation. Electronic supplementary material  Supplementary material is available in the online version of this article at and is accessible for authorized users.     

Object-management machines: Concept and implementation

The software development process deals with a wide variety of documents. For the preparation of these documents, as well as for their maintenance, appropriate data management support is requested, resulting in the coexistence of multiple object management systems within a single, advanced software development environment. In order to homogenize data management in software development environments we present the object management machine (OMM) concept as an integration framework for preexisting data management systems. An object management machine enables the creation of uniform access patterns to different data management systems, including the query interface and transaction processing. The concept is being developed in the framework of the EUREKA project ESF (EUREKA Software Factory)¹. To make it operational we demonstrate the suitability of the MUSE multidatabase integrator as an implementation framework for the Object Management Machine concept.     

Sandpiper: Black-box and gray-box resource management for virtual machines

Virtualization can provide significant benefits in data centers by enabling dynamic virtual machine resizing and migration to eliminate hotspots. We present Sandpiper, a system that automates the task of monitoring and detecting hotspots, determining a new mapping of physical to virtual resources, resizing virtual machines to their new allocations, and initiating any necessary migrations. Sandpiper implements a black-box approach that is fully OS- and application-agnostic and a gray-box approach that exploits OS- and application-level statistics. We implement our techniques in Xen and conduct a detailed evaluation using a mix of CPU, network and memory-intensive applications. Our results show that Sandpiper is able to resolve single server hotspots within 20 s and scales well to larger, data center environments. We also show that the gray-box approach can help Sandpiper make more informed decisions, particularly in response to memory pressure.     

MEMS加速度计在线快速标定系统设计与实现

微机电系统(MEMS)加速度计的标定方法主要是利用高精度转台在重力场下进行翻转实验,通过采集存储不同位置下的加速度计输出,利用事后处理的方法得到待标定加速度计的标度因数和零位电压。然而事后处理的方法效率较低,数据处理较繁琐。为了优化标定系统并提高标定效率,提出并设计一种MEMS加速度计在线快速标定系统,通过微控制器实时采集不同位置加速度计数据、处理后并传输至Lab VIEW设计的上位机,最后,实时快速拟合出标定曲线和标定参数,具有一定的工程利用价值。