SyncShare:一种用于手机终端的视频实时分享同步机制

描述用于手机终端的视频实时同步播放机制SyncShare,用户利用该机制能通过无线局域网将视频实时地分发给其他用户以便同步观看.同步视频块是同步分享播放的基础,同时网络编码策略也被应用在该系统中.通过将SyncShare机制部署在真实的手机终端上,测试了系统的同步播放性能,例如CPU使用率、电池能量消耗以及延时特性等.同时,不同编码策略下的CPU使用率和电池消耗对比也在实验中得到体现.实验结果表明,使用网络编码能有效减少最多45％的平均同步延时.     

静态与动态域先验增强的两阶段视频压缩感知重构网络

视频压缩感知重构属于高度欠定问题,初始重构质量低与运动估计方式单一限制了帧间相关性的有效建模。为改善视频重构性能,该文提出静态与动态域先验增强两阶段重构网络(SDPETs-Net)。首先,提出利用参考帧测量值重构2阶静态域残差的策略,并设计相应的静态域先验增强网络(SPE-Net),为动态域先验建模提供可靠基础。其次,设计塔式可变形卷积联合注意力搜索网络(PDCA-Net),通过结合可变形卷积与注意力机制的优势,并构建塔式级联结构,有效地建模并利用动态域先验知识。最后,多特征融合残差重构网络(MFRR-Net)从多尺度提取并融合各特征的关键信息以重构残差,缓解两阶段耦合导致不稳定的模型训练,并抑制特征的退化。实验结果表明,在UCF101测试集下,与具有代表性的两阶段网络JDR-TAFA-Net相比,峰值信噪比(PSNR)平均提升3.34 dB,与近期的多阶段网络DMIGAN相比,平均提升0.79 dB。     

基于反向学习的自适应α约束病毒种群搜索算法

为了提高该算法求解约束优化问题的能力,提出一种新的约束病毒种群搜索算法。首先,提出自适应α-level比较策略,以在算法的不同阶段充分利用可行个体与不可行个体的有效信息;其次,为了进一步提高算法求解约束优化问题的收敛速度和搜索精度,针对算法的病毒扩散行为,提出了结合反向学习机制的搜索方程,以提高种群多样性并加速全局收敛。对CEC2006中13个约束优化函数的对比仿真结果表明,本文算法在搜索精度、收敛速度以及稳定性方面,相比于αSimplex算法、粒子群遗传算法算法、交叉人工蜂群算法算法以及约束改进差分进化算法算法具有明显优势。同时将该算法应用于无人机协同实时航迹规划约束优化问题中,通过仿真实验并与利用约束改进差分进化算法对这一问题进行求解的方法进行对比,验证了本文算法在规划效率、规避威胁等方面的优越性。     

嵌入式处理器的TLB电路设计

为了提高基于虚拟存储技术的嵌入式处理器的性能,本文提出了一种用于高效加速地址转换的TLB电路结构。该电路采用64-entries的全关联结构,硬件支持基于段及不同大小页的转换方式。通过VCS和Nanosim联合仿真对电路结构和性能进行了验证,仿真结果表明,系统中加入TLB电路以后性能有显著的提高。     

基于W25Q80BL的FPGA配置控制器的设计与验证

随着FPGA的规模不断增大,其配置信息的容量也越来越大,所以如何方便快捷的读取配置信息也成为了越来越重要的问题。利用W25Q80BL型号的SPI FLASH支持四线同时读取数据的功能来实现主动模式下快速加载配置信息到FPGA。在接收到四组来自FLASH的数据后,FPGA把数据并行写入到四条chain里,较大的缩短了配置时间。仿真结果证实了设计的有效性与可行性。     

薄壁梁轴向压溃力的影响参数

薄壁梁被广泛应用于吸能元件,其轴向压溃变形是一种理想的吸能模式。基于VCS(Visual CrashStudio)模型,采用正交试验法研究了影响薄壁梁轴向压溃力的设计参数。在此基础上,分析了既能使薄壁梁保持一定吸能水平,又能降低力的波动范围促使变形更稳定的途径,采用有限元模型对分析结果进行了验证。研究表明,改变截面几何形状使截面的折角数目增多,同时降低板厚可以达到上述目的。     

A real-time personalized route recommendation system for self-drive tourists based on vehicle to vehicle communication

Recently, traffic jams and long queuing problems in tourist hot spots is growing with the increasing number of self-drive tourists. Some recommendation systems have been developed in attempt to relieve these problems. However, all these systems lack information pertaining to real-time traffic as well as the ability of personalization. In this research, we have developed a novel route recommendation system to provide self-drive tourists with real-time personalized route recommendations. This will help to reduce the traffic jams and queuing time in tourist hot spots. It will also help to personalize visiting routes based on the user’s specific preferences. Ultimately, based on the evaluation results given by experienced self-drive tourists, we have shown that the proposed system not only saves total visiting time, but also meets their specific visiting preferences.     

The influence of mechanochemical treatment of sintered submicrocrystalline corundum substrates on the structure of bioglass composites

The influence of mechanochemical treatment of submicrocrystalline sintered corundum on the structure of bioglass composites containing α-Al₂O₃ and CaO-SiO₂-P₂O₅ glasses was examined in the context of the possibility to form hydroxyapatite after being immersed in the simulated body fluid solution. Measurements of specific surface area and size and X-ray analysis of submicrocrystalline sintered corundum were conducted. Bioglass composites were obtained by placing submicrocrystalline sintered corundum grains in the CaO-SiO₂-P₂O₅ sol system, gelling and sintering at 800°C. The specimens were examined under a scanning electron microscope before and after immersion in the simulated body fluid solution for 24 and 120 h. Using the VCS algorithm, calculations of thermodynamic stability of compounds occurring in these bioglass composites were carried out, verifying the X-ray analysis. Original Russian Text ? B. Staniewicz-Brudnik, S. Szarska, K. Gamrat, 2008, published in Sverkhtverdye Materialy, 2008, Vol. 30, No. 6, pp. 40–48.