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.     

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...     

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.     

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.     

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.     

Distribution issues in the design and implementation of a virtual market place

This paper describes an investigation into the distribution issues surrounding the design and implementation of virtual market places (ViMPs). The paper starts by describing the requirements customers and service providers have from a ViMP. It is then shown how the requirements deemed most important can be addressed by exploiting the inherent distribution of certain aspects, and by distributing other aspects of such market places. In particular, the paper concentrates on the structuring of the information space describing the services and products, and its distribution between the providers and the market place mediator. Primarily, this supports the implementation of phased dialogues between the customer and the providers, while at the same time addressing the providers’ desire to protect business sensitive processes and information. Distributing the dialogue in time allows customers and providers to interact more flexibly and to gradually build understanding and trust between them, before divulging any business or personally sensitive information to each other. The distributed approach supports a scalable market place and also points towards a way of addressing providers’ legacy problems. It is also shown how the apparent contradiction of a distributed market place and the need to monitor and control it for regulation purposes can be addressed, without compromising the ability of the system to scale. Finally, the design and implementation of a virtual insurance market place using Java on a CORBA compliant platform are presented.     

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。     

The Design and Implementation of a Very Fast Experimental Pipelining Computer

The high speed potential of I.C.components can be exploited by shortening the pipeline clock period.Although there are some factors which dominate the shortening,the design of an experimental computeremploys the principle of maximum time difference at the system level to determine the clock period and theintegrated consideration of architecture,logic design and engineering layout to achieve a system clock periodof 9.8 ns using conventional ECL chips of 2ns gate delay.The multiplier in this model,which is constructedwith 0.7 ns gate delay chips,can work at a cloek period of 5.5 ns.     

Design,implementation and evaluation of a virtual storage system

Large organizations always have a strong demand for storage from data‐intensive applications and instruments. In this paper, we present the design, implementation, and evaluation of a new virtual storage system, Storage@desk, which can aggregate a large number of distributed machines within an organization to provide storage services with quality of service guarantees. Because storage virtualization is the prominent goal, Storage@desk provides clients with the abstraction of a hard drive by utilizing the Internet SCSI protocol. As such, data access to new storage services is transparent so that clients do not need to modify any existing applications nor change their current practices. Storage@desk replicates data and employs version‐based journaling for high availability. It utilizes a market‐based model for resource management and a feedback controller for automated performance control. We have developed a prototype of Storage@desk that implements the core components. Copyright © 2010 John Wiley & Sons, Ltd.     

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.     

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。     

Object‐oriented design patterns for debugging heterogeneous languages and virtual machines

Debugging multi‐language software systems requires examining and executing these systems at multiple levels of abstraction. Embedded systems, for example, often comprise a mix of assembly language device drivers and C language control code. Embedded systems increasingly utilize Java to support dynamic loading and run‐time reconfiguration. The RTEEM (Research version of the Tcl Environment for Extensible Modeling) debugger employs three design patterns in solving the problems of multi‐language embedded system debugging. The Reflective virtual machine (VM) pattern models a language‐neutral virtual machine abstraction, with language‐specific interfaces extending this abstraction. Reflection allows a debugger to inspect and control a target VM. The Chain of Responsibility is a classic pattern used to arrange language‐specific debugger command interpreters in a delegation chain. All interpreters share a single command syntax, but each interpreter adapts commands to its language abstraction by interacting with its language‐specific VM view. Composite is another classic pattern, used to combine objects into tree structures. RTEEM employs it to aggregate VM debugger chains into a hierarchy that supports uniform command syntax for debugging threads, processes, multiprocessor systems, and compositions of these entities. This paper illustrates how combining two classic design patterns with the VM abstraction as a pattern results in an architecture that is powerful and flexible in adapting to the debugging needs of heterogeneous, distributed embedded systems. Copyright © 2004 John Wiley & Sons, Ltd.     

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.     

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.     

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。