读者自带设备(BYOD)的图书馆应对策略

讨论了读者自带移动终端设备进馆的原因及其给图书馆服务维护工作造成的影响,探讨了图书馆应采取的对策,指出普及的个人终端为图书馆开展创新服务提供了设备条件。     

Parallel scheduling strategy of web-based spatial computing tasks in multi-core environment

In order to improve the concurrent access performance of the web-based spatial computing system in cluster,a parallel scheduling strategy based on the multi-core environment is proposed,which includes two levels of parallel processing mechanisms.One is that it can evenly allocate tasks to each server node in the cluster and the other is that it can implement the load balancing inside a server node.Based on the strategy,a new web-based spatial computing model is designed in this paper,in which,a task response ratio calculation method,a request queue buffer mechanism and a thread scheduling strategy are focused on.Experimental results show that the new model can fully use the multi-core computing advantage of each server node in the concurrent access environment and improve the average hits per second,average I/O Hits,CPU utilization and throughput.Using speed-up ratio to analyze the traditional model and the new one,the result shows that the new model has the best performance.The performance of the multi-core server nodes in the cluster is optimized; the resource utilization and the parallel processing capabilities are enhanced.The more CPU cores you have,the higher parallel processing capabilities will be obtained.     

Collaborative Network Security in Multi-Tenant Data Center for Cloud Computing简

A data center is an infrastructure that supports Internet service. Cloud comput the face of the Internet service infrastructure, enabling even small organizations to quickly ng is rapidly changing build Web and mobile applications for millions of users by taking advantage of the scale and flexibility of shared physical infrastructures provided by cloud computing. In this scenario, multiple tenants save their data and applications in shared data centers, blurring the network boundaries between each tenant in the cloud. In addition, different tenants have different security requirements, while different security policies are necessary for different tenants. Network virtualization is used to meet a diverse set of tenant-specific requirements with the underlying physical network enabling multi-tenant datacenters to automatically address a large and diverse set of tenants requirements. In this paper, we propose the system implementation of vCNSMS, a collaborative network security prototype system used n a multi-tenant data center. We demonstrate vCNSMS with a centralized collaborative scheme and deep packet nspection with an open source UTM system. A security level based protection policy is proposed for simplifying the security rule management for vCNSMS. Different security levels have different packet inspection schemes and are enforced with different security plugins. A smart packet verdict scheme is also integrated into vCNSMS for ntelligence flow processing to protect from possible network attacks inside a data center network     

一种基于云计算的医疗影像可视化方案架构

高级医疗影像可视化方案包含多个高级图像处理和读取程序,能处理通过CT、MR和AX等多种方式获取的2D和3D图像。该方案需建立信息获取设备、医疗信息系统（HIS）、影像归档系统与通信系统（PACS）等单元之间的无缝连接。传统方案不仅需要昂贵的基础设施建设,而且需要培训员工,对系统进行有效的配置和维护。尽管基于云计算的可视化方案可为医院节省大量的投资、维护和升级成本,但在构建可视化方案的过程中会面临一些独特的挑战,如难以处理巨量的医疗影像资料和患者健康信息的安全问题等。本文阐述了构建基于云计算的医疗影像可视化系统的关键性问题,提出了一种有效解决这些问题的通用架构。对基于该架构的私有云系统进行测试,获取了部分性能评价结果。     

Key management for outsourced data security

This paper analyzes the efficiency and security of bilinear-map-based schemes and brings about an AAA based publicly auditable scheme for cloud computing,which is much more efficient.In this scheme,a trust model including four entities is designed to provide both integrity and confidentiality protection.The proposed scheme can be proved to achieve the security goals that no cheating cloud server can pass the auditing without storing users’data intact.The efficiency of the proposal is evaluated by analyzing the fulfillment of the design goals,including the computation cost,communication cost and storage cost of our scheme.This light weight publicly auditable Proof-of-storage scheme achieves security goals perfectly,and has an excellent efficiency performance superior to the current bilinear-map-based publicly auditable Proof-of-storage scheme.     

A trusted mobile payment environment based on trusted computing and virtualization technology

In this paper, we propose a trusted mobile payment environment （TMPE） based on trusted computing and virtualization technology. There are a normal operating system （OS） and a trusted OS （TOS） in TMPE. We store the image of TOS in a memory card to hinder tampering. The integrity of TOS is protected by means of a trusted platform module （TPM）. TOS can only be updated through a trusted third party. In addition, virtualization technology is applied to isolate TOS from normal OS. Users complete ordinary affairs in normal OS and security-sensitive affairs in TOS. TMPE can offer users a highly protected environment for mobile payment. Moreover, TMPE has good compatibility in different hardware architectures of mobile platforms. As the evaluation shows, TMPE satisfies the requirement of mobile payment well.     

基于ARM9的嵌入式无线视频监控小车设计

目的将监控技术和嵌入式技术相结合,实现可移动的无线远程视频监控系统。方法在基于ARM9和linux2.6内核的嵌入式系统平台上控制摄像头采集视频、电机驱动电路以及无线网卡,并配置实现Boa服务器和MJPG-streamer视频服务器;利用CGI实现了客户端浏览器控制小车和摄像头电机的运行。结果实现了一种嵌入式视频监控小车的设计方法。结论该系统可扩展性、实时性、灵活性高,可实现对实时移动视频监控的需求。     

Windows Sockets控件在网络通信中的程序实现

Windows Sockets是基于TCP/IP参考模型,应用于微软Windows系统的网络编程接口,因其具有开放和支持多协议的机制而得到了广泛应用。讨论了Windows Sockets的通信机理及通过Visual Basic编程实现网络通信的过程。     

RSS技术在成人教育中的应用

在互联网技术快速发展的今天,依靠丰富的网络资源充实教学内容,采用移动数据通讯技术加强师生之间的联系已经成为可能。从RSS(简易信息聚合技术)出发,对当前的应用情况进行了探讨,提出了一些应用方法和策略,阐述了RSS技术在成人教育中的作用,并利用Lilina实现部分信息聚合功能。     

On Peer-Assisted Data Dissemination in Data Center Networks: Analysis and Implementation简

Data Center Networks （DCNs） are the fundamental infrastructure for cloud computing. Driven by the massive parallel computing tasks in cloud computing, one-to-many data dissemination becomes one of the most important traffic patterns in DCNs. Many architectures and protocols are proposed to meet this demand. However, these proposals either require complicated configurations on switches and servers, or cannot deliver an optimal performance. In this paper, we propose the peer-assisted data dissemination for DCNs. This approach utilizes the rich physical connections with high bandwidths and mutli-path connections, to facilitate efficient one-to-many data dissemination. We prove that an optimal P2P data dissemination schedule exists for FatTree, a specially- designed DCN architecture. We then present a theoretical analysis of this algorithm in the general multi-rooted tree topology, a widely-used DCN architecture. Additionally, we explore the performance of an intuitive line structure for data dissemination. Our analysis and experimental results prove that this simple structure is able to produce a comparable performance to the optimal algorithm. Since DCN applications heavily rely on virtualization to achieve optimal resource sharing, we present a general implementation method for the proposed algorithms, which aims to mitigate the impact of the potentially-high churn rate of the virtual machines.