Using social media to enrich information systems field trip experiences: Students’ satisfaction and continuance intentions

A well-designed field trip can promote active learning and reinforce classroom materials. Few studies have examined the potential for social media to enhance IS field trip experiences by promoting active and collaborative learning. One major barrier to the exploitation of this potential is the lack of the adoption of social media by students as a learning tool to enhance field trip experiences. Therefore, the first task is to understand how to increase the satisfaction of students in their use of social media to enhance IS field trips. This research sets out to understand the factors that could help increase students’ satisfaction with the use of social media to enhance IS field trips, and thereby their intentions to continue to use social media in future field trips. The results show that to increase user satisfaction, course instructors should ensure that students perceive the social media sites used for enhancing field trip study to be trustworthy, effortless, useful and accepted by their peers. Future research could determine how we can incorporate the use of social media to enhance the field trip learning experience.     

基于排队论的UM-BUS总线性能建模与评估

UM-BUS总线是一种具有动态容错能力和远程穿透式访问能力的高速串行总线,其性能模型对UM-BUS的综合评估和优化设计具有重要意义。针对UM-BUS总线系统,提出基于排队论的性能评估的模型,该模型定性描述了总线上不同节点之间的数据流关系、数据包到达节点的特征以及在节点处等待处理的特性;定量分析了不同数据包在总线信道传输的最大延迟、最小延迟以及平均延迟。在MATLAB平台上测试了数据包在总线上的等待时间和传输时间。实验结果可以帮助设计者快速分析总线在实际应用系统中的特性并对其进行优化配置,提高总线的使用效率。     

Capability and limitation of max- and sum-type construction of Lyapunov functions for networks of iISS systems

This paper addresses the problem of verifying stability of networks whose subsystems admit dissipation inequalities of integral input-to-state stability (iISS). We focus on two ways of constructing a Lyapunov function satisfying a dissipation inequality of a given network. Their difference from one another is elucidated from the viewpoint of formulation, relation, fundamental limitation and capability. One is referred to as the max-type construction resulting in a Lipschitz continuous Lyapunov function. The other is the sum-type construction resulting in a continuously differentiable Lyapunov function. This paper presents geometrical conditions under which the Lyapunov construction is possible for a network comprising $n\ge 2$ subsystems. Although the sum-type construction for general $n>2$ has not yet been reduced to a readily computable condition, we obtain a simple condition of iISS small gain in the case of $n=2$. It is demonstrated that the max-type construction fails to offer a Lyapunov function if the network contains subsystems which are not input-to-state stable (ISS).     

容错的网络声明式程序

介绍了基于递归规则的网络声明式语言Netlog的语法和分布式不动点语义,定义了强良好的程序,并证明了强良好的程序的计算结果对有限的消息丢失不敏感.     

异构多核上支持OpenMP3.0的自适应任务粒度策略

任务粒度是决定任务并行程序性能的关键因素,鉴于不同应用其最优的任务粒度可能不同,提出一种异构多核Cell处理器上支持OpenMP3.0的自适应任务粒度策略.该策略首先广度生成任务,直到所有的线程达到饱和,之后若某个线程执行完自身任务而处于空闲状态时,通过回溯到忙碌线程的任务树中最早可以派生任务的结点处生成新任务,以供空闲线程窃取执行.该策略不仅保证生成的任务粒度最大化,并且有效地解决了负载不均衡问题.实验在一个Cell处理器上进行,结果表明与顺序执行速度相比,自适应任务粒度策略达到了4.1到7.2的加速比,并且该策略优于现有的Tascell和AdaptiveTC方案,同时对于绝大部分应用表现出了良好的可扩展行.     

串联质谱谱库搜索鉴定技术综述

介绍蛋白质质谱鉴定领域的串联质谱谱库搜索技术,分析谱库搜索技术的基本原理,从多个角度阐述当前主流的谱库搜索方法,并对其优缺点进行比较,针对目前蛋白质质谱鉴定技术所存在的优缺点,设计其改进思路,论述目前谱库搜索技术所面临的问题以及未来的研究趋势。     

面向一体化桌面云架构的资源调度与管理策略

桌面云作为运营商IT架构云化的切入点,已在小规模试点工程中取得了成功,但此种创新类项目大规模推广会对现有技术架构及管控体系产生较大冲击,因此在实际应用中,亟需解决如何保障用户体验,实现平滑过渡等问题。立足于运营商营业厅类生产任务型场景,分析了传统架构在大规模推广条件下的种种不足,建立了一套适应未来发展的一体化桌面云架构,并以用户体验为核心,对传统架构中资源调度与管理策略进行了优化。     

基于二叉树和GPU的无缝地形场景渲染方法

设计了一种基于图形处理器(GPU)的无缝地形渲染方法。该方法基于二叉树构建多层次地形网格,该网格用基于行、列号的地形模板表示。在设计过程中,将高程数据转化为适于GPU读取的高程纹理图,再通过顶点纹理提取(VTF)技术从纹理图中采样出高程值用于渲染,整个过程在GPU端完成,提升了地形数据访问效率。同时,采用实时优化自适应网格(ROAM)算法的强制拆分法,通过控制相邻地形块的等级来消除裂缝。最后,采用TriangleStrip方式进行渲染,避免了相邻三角形中顶点坐标数据的重复传递,减少了传递到GPU的数据量。用两块地形数据对算法渲染效率进行了检验,并将算法与Clipmap算法进行了帧率对比。结果表明,该算法有效解决了分块数据的裂缝问题,达到了交互式地形渲染的要求。     

基于电信运营商桌面虚拟化系统的安全性分析与研究

桌面虚拟化作为虚拟化的热门技术之一,近几年已经开始成为电信运营商云计算的切入点,并在某些小规模试点工程中取得成功。使用桌面虚拟化的好处显而易见,其中虚拟桌面较之传统桌面在安全性上就有了极大的提高,但是毕竟计算模式发生了根本性改变,这就亟需我们去思考并不断地探索新环境下能提高桌面虚拟化系统安全性的方案、技术、其应具备的功能以及预防措施等等。只有这样,才能为桌面虚拟化在电信运营商的大规模实施提供有效支撑。