利用硬件加速层优化Android显示系统

广泛运行于移动终端的操作系统Android,因对底层硬件特性统一的抽象,具有优良的跨平台特性.但在实际应用中,因缺乏如何有效利用硬件特性的规范,Android现有设计框架无法高效使用底层硬件资源.本文基于北大众志Unicore硬件平台,为Android显示系统设计硬件加速层,通过利用硬件通道,减少了跨层函数的调用开销和数据在主存和显存间的交换次数,提升了Android显示系统中窗体绘制的性能,从而增强了用户体验.相关实验表明,本方案令Android光标操作在正常使用时CPU占用率下降约88%,摄像预览得到了83%的加速.     

跨平台移动Web开发框架与数据交互方法

针对移动Web开发中跨平台与数据交互两大关键问题,设计了一种利用PhoneGap为中间件、jQquery Mobile为UI框架和Android等手机终端系统所组成的移动Web开发框架,并提出了一种利用AJAX、JSON和HTML5等相关技术实现移动Web客户端与服务端之间跨域数据交互的通用方案。改进了AJAX受同源限制不能跨域交互的缺陷,避免使用JSONP跨域数据交互协议,提升了数据交互过程的安全性,同时解决了移动设备的跨平台等问题,可供从事移动Web开发的人员在实现数据交互过程中参考。     

跨平台系统级虚拟机的访存优化

跨平台系统级虚拟机软件模拟访存操作效率低,严重影响了虚拟机的性能.为提高跨平台虚拟机访存效率,提出了一种使用宿主系统TLB硬件、加速跨平台系统级虚拟机访存地址转换的软硬件协同优化方法.该方法相对于软件访存模拟方法,有效利用了宿主系统的硬件资源,提高了跨平台系统级虚拟机执行访存操作效率.实验结果表明该方法将虚拟机系统的整体性能提高了近15%.提出的方法已实际应用在龙芯系统级跨平台虚拟机中.     

开源.NET——Mono项目简介

一、项目起源为了应对J2EE在企业级开发领域日益强大的威胁,微软公司在2000年9月公开了秘密开发三年之久的.NET框架。.NET框架为开发人员提供了一个跨语言的开发与执行环境,它提供了许多开发人员梦寐以求的功能如:跨语言开发、内存自动回收、先进的版本管理、简单的应用部署,因此.NET框架一经推出就受到了业界的好评。但是美中不足的是,尽管微软在.NET框架中使用了中间语言,理论上可以跨平台应用,但微软公司却并没有计划为其它操作系统提供.NET框架。不能跨平台这一缺点对.NET与J2EE全面的竞争有着非常不利的影响。为了得到其它企业的支持,微软公司将.NET框架中的CLI(Common Language Infrastructure)和C#提交给了ECMA(European Computer Manufacturers Association),并于2001年12月成为ECMA的正式标准。Ximian公司遵循上述标准于2001年7月9日发起了Mono项目,该项目的宗旨是为UNIX平台下的开发人员提供可以用来开发跨平台的.NET应用的工具。Mono项目可以使基于.NET框架编写的应用实现“一次编写,到处运行”的目标。     

"观众"模式视频会议客户端研究

"观众"模式是网络视频会议的一个重要组成部分,此模式对客户端提出了跨平台性、扩展性和易部署性方面的要求.Plasticene是为了满足以上特性而构建的视频会议客户端框架,此框架应用了"构件"的思想,对视频会议客户端多媒体处理和信令处理进行了合理的抽象和封装,提供给客户端必要的基础设施,使得此类客户端在满足其特性的同时还具有了跨协议性.     

一种跨平台移动应用方案的研究与实践

随着无线网传输带宽不断增加和GPRS传输协议的普及应用,传统的B/S应用模式中的客户端正快速地迁移到诸如手机、iPhone和iPad等这类移动终端设备领域中。针对不同的移动终端产品,研究、实践和描述一种跨前端移动设备实现后端内容和服务共享的技术框架及其基本实现路线,并结合JQuery Mobile和Android等相关技术实践了跨平台移动应用程序的编程开发。     

公安行业信息中心系统建设应用方案分析

存在的问题目前各地公安机关的信息中心的软硬件平台主要存在以下问题:1.硬件处理能力低,设备老化:维护成本、数据风险增大。目前配置的服务器和存储设备大多是若干年前购置的,以目前的技术标准来衡量,这些设备性能已不能满足业务需要,而且这些硬件设备的维护成本远远高于新添置设备所需的资金。2.多数硬件资源没有纳入多层架构实行统一管理和资源共享,资源利用率低、管理复杂。由于硬件资源自成体系,独立运行,没有整合到多层架构中,多个应用系统无法按照需求动态占用硬件资源。3.目前各地信息中心的硬件资源普遍不能满足金盾工程的建设需求…     

计算机硬件资源管理系统中数据库的设计

计算机硬件资源管理系统采用Windows操作系统,用SQLServer作为管理数据库,Delphi作为开发平台,根据硬件资源管理的具体需求并结合硬件资源管理的实际使用情况,提出了基于设备静态管理和运行状态动态检测管理相结合的方法。     

开放式数控系统跨平台技术研究与应用

为了提高开放式数控系统的跨平台能力,结合开放式数控系统的结构特点,分析实现跨平台面临的主要问题,提出了开放式数控系统跨平台的一种解决方案.该方案主要通过软件源码的可移植性扩展、平台无关的通信机制和硬件抽象层技术(HAL)的使用来实现开放式数控系统跨不同软硬件平台的能力.并利用该方案成功获得了跨x86平台和龙芯平台的数控系统,同时还实现了对多种伺服及I/O控制方式的兼容,增强了原有的系统的灵活性和可扩展性.     

基于中标麒麟的测发控类软件一体化设计

针对新形势下,软件研制快速迭代、自动化要求高以及国产化要求,设计并实现了一种跨平台、可复用的测发控类软件一体化设计框架,解决了航天器地面测试工作自动化程度低、人员介入频繁、误操作率高的问题,提高系统自动化程度的同时,满足了软件国产化要求;所提出软件框架具有扩展性强、稳定性高、使用灵活等特点,试验表明软件能够适应大部分航天器地面测试流程,具有跨型号、跨平台使用特性,具有一定的实用和推广价值.     

An Internetware Based Approach to Building Web Page Integration Applications for Mobile Devices

Mobile devices are more and more popular in recent years. As a result, there''re huge requests of mobile applications, especially those integrated with multiple information. However, on one hand, most of the mobile applications at present just contain some certain kinds of information and they cannot adapt to the rapid change of users'' requirements, either. On the other hand, to build these applications, it''s usually time consuming and there are not enough resource components with programmable interfaces. In this paper, we propose an approach based on Internerware to building web page integration applications for mobile device. We introduce a framework that provides abundant internet-programmable interfaces, a flexible integration mechanism to meet the users'' rapid changing requirements and a reliable mechanism that guarantees the quality of the referred resources effectively. With this framework, we can rapidly build an application that integrates all the information according to users'' requirement.     

基于统一资源管理的超级计算机系统节能方案

从系统级节能角度出发,结合天河一号超级计算机系统硬件架构特点,通过将计算、通信、冷却、供电等各种系统资源有机结合在一起,制订统一的资源管理架构,应用最近最少使用(LRU)等多种管理策略对系统资源进行集中管理,有效降低系统能耗。     

基于容器的安全接入虚拟化

面对电力系统中信息网络、互联网边界海量电力物联网终端的访问需求,针对传统安全接入边界各类装置实现方法资源分配不均、兼容性差、扩展性差以及性能瓶颈等问题,提出一种基于容器的安全接入虚拟化模型。该模型采用DPDK高性能数据包处理框架、成熟容器集群管理框架、服务计算节点编排等关键技术,将数据平面与控制平面完全分离,构建独立的数据虚拟化转发平面,并采用SR-IOV技术实现硬件资源的虚拟化和统一调度管理,将安全接入能力服务化。基于该模型的安全接入装置集群具有高性能、高可用、灵活编排、可扩展性强等优势。实验结果表明,该模型方法能够高效合理利用硬件资源,大幅提升电力系统边界安全接入的效率。     

Production service system enabled by cloud-based smart resource hierarchy for a highly dynamic synchronized production process

The rapidly changing market demands entail a modern production system to cope with ever more diversified production orders. Not only the parameters and flow of the production process, sometimes the production resources and the corresponding application systems which make production decision and control even need to be reconfigurable. Due to the inability to provide dynamically reconfigurable manufacturing resources, systems and application systems, enterprises have to sacrifice profits to narrow their business scope or take risks to purchase a large number of production resources. In any case, it has brought operational burden to enterprises. This paper systematically analyses the production management requirements of a large-scale production system in terms of both hardware (production equipment) and software (application system) which is oriented to dynamic production demands, and then proposes a production service system enabled by cloud-based smart resource hierarchy (PnSS-CSRH). The platform is based on an open resource management system and inherits the general cloud structure and the AUTOM framework. PnSS-CSRH provides industrial users with integrated and synchronization services for the software and hardware resources involved in the production process in the PnSS mode. Using the integrated service mode, PnSS-CSRH not only helps resource providers to increase the frequency of resource leases, provides customers with targeted and systemic hardware and software overall solutions, and increases the platform usage rate, which brings more benefits to the stakeholders of PnSS-CSRH. At last, the PnSS-CSRH is used to provide services to the case company to validate the effectiveness.     

Semantic-enabled CARE Resource Broker (SeCRB) for managing grid and cloud environment

Grid computing is mainly helpful for executing high-performance computing applications. However, conventional grid resources sometimes fail to offer a dynamic application execution environment and this increases the rate at which the job requests of users are rejected. Integrating emerging virtualization technologies in grid and cloud computing facilitates the provision of dynamic virtual resources in the required execution environment. Resource brokers play a significant role in managing grid and cloud resources as well as identifying potential resources that satisfy users’ application requests. This research paper proposes a semantic-enabled CARE Resource Broker (SeCRB) that provides a common framework to describe grid and cloud resources, and to discover them in an intelligent manner by considering software, hardware and quality of service (QoS) requirements. The proposed semantic resource discovery mechanism classifies the resources into three categories viz., exact, high-similarity subsume and high-similarity plug-in regions. To achieve the necessary user QoS requirements, we have included a service level agreement (SLA) negotiation mechanism that pairs users’ QoS requirements with matching resources to guarantee the execution of applications, and to achieve the desired QoS of users. Finally, we have implemented the QoS-based resource scheduling mechanism that selects the resources from the SLA negotiation accepted list in an optimal manner. The proposed work is simulated and evaluated by submitting real-world bio-informatics and image processing application for various test cases. The result of the experiment shows that for jobs submitted to the resource broker, job rejection rate is reduced while job success and scheduling rates are increased, thus making the resource management system more efficient.     

Wi-Fi网络下多AP协作边缘计算资源分配策略

近年来, AR/VR、在线游戏、4K/8K超高清视频等计算密集且时延敏感型应用不断涌现, 而部分移动设备受自身硬件条件的限制, 无法在时延要求内完成此类应用的计算, 且运行此类应用会带来巨大的能耗, 降低移动设备的续航能力. 为了解决这一问题, 本文提出了一种Wi-Fi网络多AP (access point)协作场景下边缘计算卸载和资源分配方案. 首先, 通过遗传算法确定用户的任务卸载决策. 随后, 利用匈牙利算法为进行任务卸载的用户分配通信资源. 最后, 根据任务处理时延限制, 为进行任务卸载的用户分配边缘服务器计算资源, 使其满足任务处理时延限制要求. 仿真结果表明, 所提出的任务卸载与资源分配方案能够在满足任务处理时延限制的前提下有效降低移动设备的能耗.     

Resource management for multimedia applications,distributed in open and heterogeneous home networks

The home network is an open, heterogeneous and distributed environment with quality of service requirement. Existing resource reservation strategies modify devices and applications and do not consider heterogeneity.This paper presents a non-intrusive and adaptable resource management framework, developed upon an architecture customized for the actual devices. It uses global components, delegating to local components the management of local resources. These components rely on the resource reservation mechanisms provided by Linux.The framework has been implemented on real devices. The evaluations show that reservations are guaranteed even with noise on the resources, which also guarantees the expected quality of service.     

基于SNMP协议的WBEM设计和实现

对简单网络管理协议(SNMP)和基于Web的企业管理(WBEM)两种系统管理技术进行了研究和分析。通过在可扩展性、响应速度、Web服务支持等方面的对比,总结了SNMP和WBEM各自的优缺点。在此基础上提出了一种使用WBEM管理SNMP兼容设备的新框架,并在此SNMP和WBEM结合的框架上,实现对系统底层资源的管理。经实验证明,只需要简单的步骤就可将SNMP设备纳入到WBEM的体系中,该结合框架不仅有利于设备的分布式管理,而且结合Web服务提供了更多有效的接口,使仅支持SNMP的设备能支持更多接口的访问。     

高职院校在线实训平台的设计与实现

在分析和研究当今实训项目技术的基础上,采用SOA的开放式远程实验系统框架,设计并实现一种安全的、灵活的、开放的、跨平台和跨地域的在线实训平台。在线实训平台为远程网络终端的学生提供虚拟实验环境和远程实际实验。虚拟实验提供网络、硬件的仿真软件;远程实际实验即可登录远程设备进行真实实验操作。在线实训平台能够部分有效地解决职业类院校中由于实验资源紧张带来的一些问题。     

Adaptive security protocol selection for mobile computing

The mobile computing paradigm has introduced new problems for application developers. Challenges include heterogeneity of hardware, software, and communication protocols, variability of resource limitations and varying wireless channel quality. In this scenario, security becomes a major concern for mobile users and applications. Security requirements for each application are different, as well as the hardware capabilities of each device. To make things worse, wireless medium conditions may change dramatically with time, incurring great impact on performance and QoS guarantees for the application. Currently, most of the security solutions for mobile devices use a static set of algorithms and protocols for services such as cryptography and hashes.In this work we propose a security service, which works as a middleware, with the ability to dynamically change the security protocols used between two peers. These changes can occur based on variations on wireless medium parameters and system resource usage, available hardware resources, application-defined QoS metrics, and desired data “security levels”. We compare our solution to some widespread static security protocols, demonstrate how our middleware is able to adapt itself over different conditions of medium and system, and how it can provide a performance gain in the execution of cryptographic primitives, through the use of data semantics.