简述AVS视频编码技术及应用展望

本文对AVS视频编码技术标准系统结构和核心技术特点进行综述,把AVS视频标准与MPEG-4 AVC/H.264进行了比较和分析,从而阐述了AVS视频标准的优势和特点,并对AVS视频标准的应用和发展前景进行了讨论。     

IPTV视频编解码标准比较与分析

介绍了我国具有自主知识产权的AVS编解码标准,以其中涉及到视频压缩编码的AVS第二部分(AVS1-P2)和第七部分(AVS1-P7)为基础,说明了AVS视频标准的结构和原理;深入介绍了变换和量化、帧内预测、帧间预测、熵编码等AVS视频标准的关键技术;并和其它两个MPEG-4、H.264国际标准,在编码效率、软硬件成本等性能方面进行了比较和分析,最后得出AVS在我国是有比较好的应用前景.     

AVS中音视频编码压缩技术研究与分析

介绍了音视频编码标准AVS中的主要技术特点,对AVS标准所采用的主要技术进行了综述,给出了AVS视频标准与MPEG-4 AVC/H.264编码器性能的比较和分析,讨论了AVS的发展前景.     

AVS中的音视频编码压缩技术

介绍了音视频编码标准AVS中的主要技术特点,对AVS标准所采用的主要技术进行了综述,给出了AVS视频标准与MPEG-4 AVC/H.264编码器性能的比较和分析,讨论了AVS的发展前景.     

网络流媒体应用中的AVS视频标准配置方案

介绍了AVS视频组AVS-N AHG小组所给出的网络流媒体应用中的AVS视频标准配置方案,并叙述了ISMA的性质和标准情况,以及ISMA 2.0的内容和结构.     

AVS/AVS+在3D高清视音频编辑包装系统中的应用

AVS/AVS+作为我国自主研发制定的视频编解码标准,通过编解码算法的研发优化,成功应用到3D高清视音频编辑系统中。本文介绍了AVS/AVS+标准技术优势,分析了AVS+立体视频编码针对非线性编辑系统的技术优化,介绍了新奥特3D非线性编辑系统对AVS/AVS+的支持,探讨了AVS/AVS+在非线性编辑系统中应用研究的意义。     

AVS数字音视频编解码标准

数字音视频编解码标准（AVS）是中国自主制订的数字电视、IPTV等音视频系统的基础性标准。AVS标准第2部分视频（AVS1-P2）属高效的第二代视频编码技术，相比于第一代标准MPEG-2。编码效率提高2—3倍，并且实现方案简洁，因此，AVS视频标准已经为IPTV，数字电视厂播等应用做好了充分的技术准备。同时，AVS标准具有专利许可方式简洁、相关标准配套的优势。这将为中国的IPTV、数字电视广播等重大信息产业应用及民族IT产业发展起到积极的推动作用。     

AVS1-P7与H.264关键技术及性能比较

AVS1-P7是中国最近自主制定的数字音视频编解码系列标准(AVS)中的第七部分移动视频编码标准.本文详细论述了AVS1-P7和H.264采用关键编码技术的异同,给出了两者的性能比较,分析和探讨了AVS1-P7的应用前景、当前存在的问题和进一步研究方向.     

移动视频技术浅析

文章分析了移动视频业务涉及的国际主流数字音视频编解码标准H.264以及我国自主标准AVS的技术特点,同时分析了主流移动视频承载技术——MBMS标准、DVB-H标准、T/S-DMB标准以及Stimi标准的特点,最后对移动视频业务相关技术的发展前景进行了分析与探讨。     

AVS视频标准研究

AVS是中国制订的新一代数字音视频编解码标准，重点探讨AVS视频标准即AVS1-P2的关键技术，并将AVS与H．264／AVC等其他标准进行比较，最后展望AVS的发展前景。     

Group 2 element and related compounds as chemical vapour deposition precursors for high-temperature superconducting metal oxides

The advent of high-temperature superconducting metal oxides (SMOs) has prompted an increasing number of studies aimed at the development of new routes to their syntheses, in particular in the form of thin films. The preferred method in this regard has been that of chemical vapour deposition (CVD); however, significant difficulties have been associated with the efficacy of commercial precursors for the group 2 metals, in particular those of the bis(β-diketonates) of barium, whose co-ordinative unsaturation leads to cluster formation. The development of alternative β-diketonate precursor systems has focused upon the synthesis of stable Lewis acid-base complexes by either inter- or intramolecular stabilisation. The results of these studies are described herein, along with a review of the research to date on non-β-diketonate derivatives of the group 2 metals, including organometallic, halide, amide, carboxylate and alkoxide compounds. On the basis of the results to date, a series of goals for the synthesis of the ideal precursor are discussed.     

Electronic Structure of Semiconductor Nanocrystals

This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors.     

Optical vibration and deviation measurement of rotating machine parts

It is of interest to get appropriate information about the dynamic behaviour of rotating machinery parts in service. This paper presents an approach of optical vibration and deviation measurement of such parts. Essential of this method is an image derotator combined with a high speed camera or a laser doppler vibrometer （LDV）.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

When We Stop Talking Politics: The Maintenance and Closing of Conversation in Contentious Times

Despite the democratic significance of citizen talk about politics, the field of communication has not considered how that talk is weathering stresses facing our civic culture. We examine political talk during an archetypal case of political contentiousness: the recall of Governor Scott Walker of Wisconsin in 2012. Pairing qualitative and quantitative methods, we show that a fracturing of civic culture took place in which many citizens found it impossible to continue political discussion. Individuals at fault lines of contention, by nature of occupation, geographic location, or other personal circumstance, were most prone to this breakdown. Our results call into question the ability of talk to bridge political and social differences in periods of polarization and fragmentation, with implications for democratic functioning.     

Ad-hoc网络上的动态路由协议研究及实现

概要介绍了Ad-hoc网络的概念。通过分析其网络特点,描述了该种网络对动态路由协议的要求。简要介绍了当前流行的几种Ad-hoc动态路由协议及特点。详细描述了OLSR路由协议的术语和主要思想。最后结合工程实践,介绍了实现该协议过程中的关键问题,并在模拟网络环境下验证了该协议的正确性。     

小角度扩展相关性近似算法分析

本论文提出一种在多天线MIMO信道相关性建模中小角度扩展近似理论算法,并应用于分析MIMO系统性能。分析中分别对三种不同角能量分布情况下的空间相关性研发快速近似计算法,并同时提出双模(Bi-Modal)角能量分布情况下的近似运算。通过分析这些新方法的近似效率,可以得到计算简单、复杂度低、而且符合实际的MIMO相关信道矩阵,对系统级的快速高效计算法的研究和系统级的评估以及误差分析具有重要的意义。     

胆小管超微细胞酶学研究

以电镜细胞化学的方法,观察了小鼠胆小管酶的分布。观察的12种酶中,NDPase和G6Pase三种酶分布于胆小管微绒毛;AlPase、Na~+-K~+ATPase、Mg~(++)-ATPase、Ca~(++)-ATPase、CMPase、ACase和5＇-Nase等7种酶分布于胆小管微绒毛,也分布于肝细胞邻接面细胞膜和Disse间隙微绒毛;ACPase、细胞色素氧化酶以及线粒体ATPase不分布胆小管微绒毛,也不分布Disse间隙微绒毛和肝细胞膜。据信,胆小管微绒毛上的酶参与胆汁成份的转运,提供转运所需能量以及还可能与某些代谢过程有关。本实验中磷酸水解酶类使用的铈基法及亚铁氰化钾半还原的锇酸后固定法,效果优于铅法。     

电磁兼容检测实验室测试系统相符性比对研究

电磁兼容测试结果与检测实验室可靠性程度直接相关,检测实验室自身质量是保证电磁兼容测试结果准确性先决条件,检测实验室测试系统相符性则成为电磁兼容系统性能评估中需要考虑的关键内容和重要指标。因此,检测实验室测试系统相符性比对是实现电磁兼容系统评估研究的基础工作之一。本文首先针对电磁兼容检测实验室测试系统相符性比对的特点,结合自己几年来的测试实践论述了电磁兼容检测实验室测试系统相符性对比方案,然后提出了具体的案例同时进行了详细的分析,最后总结出了影响电磁兼容检测实验室测试系统相符性因素,整个案例和分析过程及结果可作为电磁兼容检测实验室测试系统相符性比对的手段和依据,具有重要的现实指导意义。     

基于卷积神经网络的PCB板通用分拣算法

传统PCB板分拣算法特征点由人工提取,位姿计算方法单一,且存在预处理步骤繁琐、样本要求高、位姿精度低、适用性低等缺点。为解决上述问题,文中提出一种基于卷积神经网络的PCB板通用分拣算法。改进的CaffeNet网络模型自动学习大量图片数据中PCB板的深层特征,并完成PCB板自动识别分类。运用改良RANSACS算法提高ORB算法特征点匹配正确率,采用最小二乘法计算模板图片与待匹配图片间角度差,以实现各类PCB板快速定位。实验证明,算法分拣正确率达到99.35%,具有良好的准确率和分拣效率。