Joint video adaptation and erasure code for video broadcast in wireless networks

Advances in wireless access technologies such as WiMax and LTE have accelerated the development of wireless video applications.Though existing erasure codes are designed for wireless data broadcasting,their potential can only be realized for wireless video broadcasting if the distortions associated with video packets and their complex decoding dependency are taken into consideration.In this paper,we propose the greedy video erasure code(GVEC)to minimize average video distortion by accounting for the temporal scalable decoding dependency among video frames e.g.I,P and B frames in MPEG.GVEC is a greedy algorithm and sufers from high computational complexity.For practical implementation,we have designed the joint video adaptation and erasure code(JVEC)with lower complexity,which can generate erasure codes on the fly to guarantee the decoding of important video frames.Simulation results show that the performance of JVEC is very close to that of GVEC,and is superior to that of existing erasure codes.Our results also show the existence of a performance tradeof between video distortion and video packet throughput.     

一种基于干扰估计的虚拟功能服务链创建及部署方法

针对网络功能虚拟化中服务链性能受到负载干扰的问题,提出一种考虑虚拟功能间干扰的虚拟功能服务链部署方法。首先,基于CPU利用率和I/O带宽对虚拟功能干扰度进行估计;然后,构建虚拟功能部署和链路创建模型,从链路速率、节点数量、延迟等角度提出了服务链部署优化目标;最后,以干扰度估计结果为依据,根据模拟退火思想提出一种服务链功能组合和选择方法,并利用部署模型将链路实例化。实验结果表明,和现有方法相比,本文方法能够有效提高服务链的执行性能并满足部署优化目标。     

Corrosion Inhibition Efficiency and Adsorption Behavior of the Branched Cationic Tetrameric Surfactant for Carbon Steel in HCl Medium

Protection of Metals and Physical Chemistry of Surfaces - The branched cationic tetrameric surfactant (4C14tetraQ) that the length of four hydrocarbon chains is 14 was synthesized, and the...     

A Phase Change Memory Chip Based on TiSbTe Alloy in 40-nm Standard CMOS Technology

Nano-Micro Letters - In this letter, a phase change random access memory (PCRAM) chip based on Ti0.4Sb2Te3 alloy material was fabricated in a 40-nm 4-metal level complementary metal-oxide...     

6061-T6铝合金阶段性疲劳损伤试验研究

开展车用铝合金疲劳损伤检测与评估,对汽车轻量化材料的应用具有重要的理论意义和工程价值.基于CT损伤检测和缺陷重构技术,开展了6061-T6铝合金阶段性疲劳损伤特性研究.首先,对车用铝合金材料进行静拉伸试验和阶段性疲劳循环加载试验,得到了不同阶段的疲劳损伤试样.接着,利用基于X-ray的CT损伤检测,实现损伤试样内部的孔...     

分离栅式快闪存储器擦除性能的工艺优化

随着电子产品的普及,分离栅式快闪存储器作为闪存的一种,由于具有高效的编程速度以及能够完全避免过擦除的能力,无论是在单体还是在嵌入式产品方面都得到了人们更多的关注。随着闪存市场高集成度的发展需求,分离栅式快闪存储器的尺寸也在逐渐地缩小。从结构和工艺优化方面探讨在这一微缩过程中,如何有效提高分离栅式快闪存储器的擦除效率。通过实验发现通过形成非对称性浮栅结构,优化浮栅到擦除栅侧的结构形貌,可以显著改进分离栅式工艺快闪存储器的擦除性能。     

Preparation of Bi2O3@PCPA-KH590/chloroprene composites with good mechanical properties under high-filling

As a “green” radiation protection material with the potential to replace lead oxide, bismuth oxide has more research applications in the field of γ protection. However, due to their different surface properties, there are compatibility and interaction problems between metal oxides and rubber. To enhance the performance of bismuth oxide in neoprene, Bi₂O₃@PCPA-KH590 was prepared by coating bismuth oxide with polyphenol/polyamine and grafting KH590 on the surface of bismuth oxide. This allows for creating more active sites with the help of polyphenol/polyamine, enabling KH590 to be grafted onto bismuth oxide particles. The S functional group on the silane coupling agent is then cross-linked with the rubber substrate, enhancing the dispersibility of the bismuth oxide powder. This improvement not only improves the dispersibility of the bismuth oxide powder but also enhances the mechanical properties of the rubber composite material. Compared with pure CR, the mechanical properties of 60 wt% filler-modified powder composites can still be maintained at a high level, with the tensile strength reaching 12.83 Mpa. In sum, the proposed method appears feasible for preparing highly filled radiation protection rubber-based materials.     

新一代氟碳涂料

本文介绍了PPG工业的第二代热固性氟碳涂料，包括涂层体系、商业用逢、耐候性并列出了性能指标。