Research on technology of desktop virtualization based on SPICE protocol and its improvement solutions

Increasingly mature cloud computing technology promotes virtual desktop technology, which can solve many problems existing in traditional computing models. However, virtual desktop solutions introduce the thorny problem of how to deliver a real desktop experience to users, as if they are using it locally, especially when playing video. The SPICE （simple protocol for independent computing environments） virtual desktop solution provides several image compression algorithms to address this problem with the purpose of making virtual desktops as real as possible. Although different compression algorithms can contribute their own abilities to different images to a large extent, switching between them is a big problem that consumes a large amount of resources to detect the different type of image and also causes jitter of the virtual desktop. This paper proposes a new solution, called SPICEx, using the JPEG2000 compression algorithm with dynamic compression ratios to solve the problem and finally validates that the performance is better than that of SPICE. With better quality of user experience and also reducing bandwidth consumption, SPICEx solution is meaningful in virtual desktop fields and can be widely used.     

Robust sparse principal component analysis

The model for improving the robustness of sparse principal component analysis（PCA） is proposed in this paper. Instead of the l2-norm variance utilized in the conventional sparse PCA model,the proposed model maximizes the l1-norm variance,which is less sensitive to noise and outlier. To ensure sparsity,lp-norm（0 p 1） constraint,which is more general and effective than l1-norm,is considered. A simple yet efficient algorithm is developed against the proposed model. The complexity of the algorithm approximately linearly increases with both of the size and the dimensionality of the given data,which is comparable to or better than the current sparse PCA methods. The proposed algorithm is also proved to converge to a reasonable local optimum of the model. The efficiency and robustness of the algorithm is verified by a series of experiments on both synthetic and digit number image data.     

高抗冲聚苯乙烯的阻燃研究

利用锥形量热仪(CONE)研究了阻燃高抗冲聚苯乙烯(HIPS)的燃烧性能,同时也采用垂直燃烧、氧指数等方法进行了对比测试。含十溴二苯乙烷的试样不仅保持了原有的物理机械性能,而且阻燃效果明显。相对于使用十溴二苯醚阻燃的HIPS,十溴二苯乙烷的使用不会产生多溴代二问题,产品符合一定的环保要求。     

水滴形歧管的结构分析

本文就衣架式模头水滴形歧管的结构设计，根据聚合物加工的流变理论，结合生产实际对水滴形截面的歧管流道分配系统进行分析，使得所设计的挤塑模在尽可能高的流速下，生产出符合尺寸及形状公差的均质片材。     

高校创新教育中存在的问题及对策

创新教育是一个不断改革发展的过程,更是一个需要在实践中不断探索的过程。开展教育创新,除了思想认识、教育模式、课程内容和教育手段等问题以外,还有教师方面的问题和教学管理方面的问题。创造适合创新教育的环境、突出以人为本的原则、具有良好的政策导向以及创造一个宽松、自由的创新制度、构建符合高校自身实际的创新性课程体系,是高等学校开展创新教育的基本保障。     

基于主题教学模式视阈下中餐烹饪教学设计研究 ——以肉类菜肴制作为例

文章指出了传统教学模式下中餐烹饪教学所存在的问题,以及主题教学模式应用于中餐烹饪教学所带来的改变,因势利导阐述了基于主题教学模式理念下中餐烹饪肉类菜肴制作的具体教学设计案例,并反思了此教学设计案例的成功与不足,最后分析了主题教学模式理念下中餐烹饪教学实施过程中面临的挑战,以期为中餐烹饪教学设计提供参考与借鉴.     

车辆荷载作用下贝雷梁钢便桥动态响应数值仿真分析

以现代抢险救灾常用的贝雷梁钢便桥作为研究对象,采用ANSYS对其建立空间整体有限元模型,运用瞬态分析方法,模拟车辆过桥的整个过程,分析贝雷梁钢便桥的动态响应.结果表明:双排贝雷梁不均匀承担荷载,内侧贝雷梁相对较大,尤其在中轴和后轴荷载作用时,内外贝雷梁竖向位移差异最大;双排贝雷梁侧向位移几乎相同,且在中轴和后轴荷载作用时最大;主要以侧向和竖向振动为主,且不可忽略侧向振动响应,轴向振动响应较小可忽略不计.     

承德地方企业与高校合作公共政策

我国70%左右的科技人员集中在高校、科研院所。高等学校具有全国最强的创新资源和优势。承德市经济基础薄弱、技术水平较低,但是具有丰富的自然资源,特别是山林、水和旅游资源丰富,随着高速公路网和高铁的建设,已经成为京津冀和东北、内蒙的交通枢纽。如果能够科学合理地选择合作方式,建立基于市场的长期有效的激励机制就能够把这两种优势有效地结合起来,产生巨大的发展动力,有力地促进创新型城市的发展。     

一类时滞乙肝病毒模型的稳定性分析

研究了具有时滞和非线性发生率的乙肝病毒模型的稳定性及Hopf分支问题.利用微分不等式技巧,讨论了系统解的正性和有界性.利用泛函微分方程的稳定性理论,通过分析模型在平衡点处超越特征方程根的分布情况,讨论了时滞对平衡点稳定性的影响.研究结果表明:时滞不影响无病平衡点的稳定性;时滞会诱发地方病平衡点的稳定性,并且在其附近产生小振幅的周期解.