基于地理位置和多阶邻节点辅助的编码感知无线多跳网络路由协议

提出一种适用于无线多跳网络的基于地理位置的多阶邻节点辅助的编码感知路由协议(LFCR).LFCR基于数据流间编码思想,借助地理位置信息,在建立路由时,综合考虑编码机会和传输能够带来的数据包正向前进位移,在创造具有编码机会路径时,避免了路由过度绕远.仿真结果表明,相比于经典编码路由协议COPE,LFCR能够显著提高网络性能.     

Very Low Bit Rate Video Coding Using Motion Compensated 3 D Wavelet TransformVery Low Bit Rate Video Coding Using Motion Compensated 3 D Wavelet Transform

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Joint coordination when running in minimalist,neutral, and ultra-cushioning shoes

ABSTRACT

Ultra-cushioning (ULTRA) shoes are new to the running shoe market. Several studies have evaluated kinematics and kinetics while running in ULTRA shoes, however it remains unknown how such shoes influence joint coordination. Therefore, the purpose of this study was to evaluate lower extremity coordination and coordination variability when running in minimalist (MIN), traditional (NEUT) and ULTRA shoes. Fifteen runners ran for ten minutes in each shoe type. Coordination patterns and coordination variability were assessed for rearfoot-tibia, rearfoot-knee, and tibia-knee couplings using a modified vector coding method during early, mid, and late stance periods. During late stance ULTRA shoes resulted in more antiphase coordination than MIN (p =.036) or NEUT (p =.047) shoes and less in-phase coordination than MIN (p =.048) or NEUT (p =.013) shoes. During late stance there was also more proximal phase rearfoot-knee coordination in ULTRA shoes than in either MIN (p =.039) or NEUT (p =.005) shoes and less in-phase coordination in ULTRA shoes than in NEUT shoes (p =.006). There were no differences in coordination variability between shoes during any phase. The differences in coordination may have implications for tissue loading and injury development when running in ULTRA shoes..     

基于空间策略网格的符号级联合信源信道编译码快速算法

提出一种基于空间策略网格图的符号级联合信源信道编译码快速算法。构建联合译码的平面网格图,可以实现比比特级译码更好的译码性能。然而平面网格图结构复杂,使得符号级联合信源信道译码过程复杂度高。提出一种新的高效空间策略网格,通过满足限制条件方程对可变长符号的权重值进行优化,结合可变长符号后验概率译码,形成一个整体快速编译码算法。两项仿真实验的结果表明,相比平面网格图,该方法减少译码复杂度近50%,并使系统在相同功率信噪比条件下传输的比特错误率更低。这种方法可以很好地保护可变长编码后的信息数据,适用于资源受限的环境中的符号级联合信源信道编译码。     

集成共享地理空间数据格网化编码研究

针对陆地表层地理空间数据的集成共享问题,提出从数据分类、数据编码到数据格网化编码的解决方案。 从我国国情出发,以中国国家地理格网为基础,分析其空间数据的组织与编码体系,并针对国家科技基础条件平台— 地球系统科学数据共享平台中的陆地表层数据,提出结合数据分类的数据属性编码,进而建立能够与国家地理格网相 衔接的地理空间数据格网化编码应用方案。以地理空间数据的点、面实体数据为例,证实了该编码的应用可行性。预 期该编码方案能够在科学数据资源管理、数据检索访问、数据资源集成、数据资源格网化处理、数据资源空间分析、     

Source extension based on ε-entropy

It is known by entropy theory that image is a source correlated with a certain characteristic of probability. The entropy rate of the source and ? entropy (rate-distortion function theory) are the information content to identify the characteristics of video images, and hence are essentially related with video image compression. They are fundamental theories of great significance to image compression, though impossible to be directly turned into a compression method. Based on the entropy theory and the image compression theory, by the application of the rate-distortion feature mathematical model and Lagrange multipliers to some theoretical problems in the H.264 standard, this paper presents a new the algorithm model of coding rate-distortion. This model is introduced into complete test on the capability of the test model of JM61e (JUT Test Model). The result shows that the speed of coding increases without significant reduction of the rate-distortion performance of the coder.     

Active digital spoof plasmonics

Digital coding and digital modulation are the foundation of modern information science. The combination of digital technology with metamaterials provides a powerful scheme for spatial and temporal controls of electromagnetic waves. Such a technique, however, has thus far been limited to the control of free-space light. Its application to plasmonics to shape subwavelength fields still remains elusive. Here, we report the design and experimental realization of a tunable conformal plasmonic metasurface, which is capable of digitally coding and modulating designer surface plasmons at the deep-subwavelength scale. Based on dynamical switching between two discrete dispersion states in a controlled manner, we achieve digital modulations of both amplitude and phase of surface waves with nearly 100% modulation depth on a single device. Our study not only introduces a new approach for active dispersion engineering, but also constitutes an important step towards the realization of subwavelength integrated plasmonic circuits.     

浅析植入式广告的生存状况

文章讨论植入式广告的生存状况,整体分两部分即植入式广告的生存的土壤与其发展面临的问题。揭示广告采用新形式在特定的传播环境中自身的适应与调节能力,及其与营销策略的契合与对受众注意力产生的影响。     

可伸缩编码中的RTP封装及其应用

可伸缩视频编码（Scalable Video Coding,SVC）一般采用实时传输协议（Real-time TransportProtocol,RTP）保证视频数据流的实时传输和质量监测。本文在分析SVC码流结构和RTP协议的基础上实现了H.264/SVC视频数据的RTP封装算法,提出了一种基本层与增强层分离的灵活封装机制模拟SVC在不同差错信道中的传输,通过在H.264/SVC模拟测试环境中的实验证明RTP封装机制的有效性,标准兼容性和可扩展性。     

基于CCSDS IDC的联合信源与安全编译码

CCSDS图像数据压缩(IDC)标准和分组密码算法SMS4通过将数据压缩与安全分别最优化,使编译码总体性能达到最佳.该算法计算复杂度高,难以保障图像数据在资源受限网络中有效和安全传输.本文使用SMS4分组密钥对图像直流系数进行随机算术编码;对交流系数采用序列加密编码,提出一种基于CCSDS IDC的联合信源与安全编译码算法.仿真实验表明,该算法降低了计算复杂度,同时提供了良好的安全性能.