编码

On the basis of introducing the channel and system model of wireless optical communication,average bit error rate of uncoded and RS coded system with channel side information were analyzed,and compared with Turbo coded system from the following two aspects:received optical power and Log-amplitude fluctuation variance.

在介绍无线光通信信道及系统模型的基础上，推导了无线光通信未编码系统和RS编码系统在已知信道边信息条件下的平均误码率，从接收光功率和对数振幅起伏方差方面对RS码编码系统和Turbo编码系统的性能进行比较。

Simulation results of symmetric QPSK/8PSK modulated signals show that increasing the number of states of the coder will improve the coding gain in comparison with uncoded one.

结果表明：在对称调制信号上，调制方式分别为4PSK和8PSK模式，编码器状态数增加相对于未编码时的BPSK和QPSK编码增益可以得到提高；非对称调制信号集相对于对称调制信号集可进一步改善编码增益。

this paper analyses the basic principle of tpc,compares the error performance in the system which has been applied with tpc with the uncoded system,studies the influences which different block codes and iterative numbers to tpc decode performance.under the circumstances of different iteration numbers and block codes,experiment simulation is carried on.the simulation results indicate that introduction of tpc can get the code gain of 5~6 db.tpc decoding algorithm is simple,and doesn′t have the error floor,the complexity of its hardware implementation is smaller,it is a kind of practical channel coding method.

摘 要：在分析turbo 乘积码的基本编译码原理的基础上，比较了未编码与编码后系统的差错性能，研究了选取不同分量码、不同迭代次数对tpc译码性能的影响。在不同迭代次数与分量码情况下，进行了仿真实验。仿真实验表明，在相同的差错性能条件下，采用tpc码能带来5~6 db的编码增益。tpc译码算法简单，没有错误平层，硬件实现复杂度较小，是一种非常实用的信道编码方式。

BACE algorithm has the desired property that does not reduce the encoding efficiency of the CABAC entropy encoder compared to the CIME algorithm for CAVLC entropy encoder. Both CIME and BACE algorithms can adapt to the content security level by choose the amount and different key parts of the video stream to be encrypted, the theoretical and experimental results show that both these algorithms can effectively encrypt the video content. Due to the ability of encrypting the video content without violating the syntax, the BIME and BACE algorithms can be employed used for many advanced H.264/AVC coding options without first decrypting the video stream, like Data Partition and UnEqualized Protection for the enhancement of transmission robustness, and the scalable coding in order to match the different channel capacity.

上述两种结合了H.264/AVC熵编码器特征的内容选择性加密算法，由于其加密后的视频码流的句法结构完全符合H.264/AVC视频编码标准，与传统的基于块数据的块加密算法相比较，本文提出的两种内容加密算法可以使得加密后码流在无需解密的情况下，实现H.264/AVC视频编码标准为移动视频应用而设计的诸多特性，如：增强传输鲁棒性的数据分割技术和非均衡保护技术，以及直接做匹配信道带宽的分级编码操作等，具有更高的灵活性和计算效率，从而可以灵活运用于各种应用场合。

But for different specialties people gave different models for secure network coding. For instance, J P Vilela introduced light weight secure network coding, and K Bhattad introduced weakly secure network coding. When considering the practical secure network, we must think over the network coding that resists active attack, that is to say resists Byzantine attack. In this paper we also introduce such kind of network coding.

蔡宁和杨伟豪首先针对单信源有向无圈网络给出了安全网络编码的定义和模型，其他研究者也各自提出了不同的安全模型，如J P Vilela提出了轻量级安全的网络编码，K Bhattad提出了弱安全的网络编码等，另外还有抗拜占庭攻击的网络编码。

Microsatellites in various components in Oryza sativa SSP. Japanica were computed and censused. The result showed: Microsatellites distributed in both coding regions and non-coding regions of genes and other regions in rice genome. The only quantitative relationship of microsatellites among regions could be confirmed. In quantitative, microsatellite content in non-coding region is higher than in coding region, but the nature of tri-nucleotide microsatellite excepts. That microsatellites in rice EST sequences are plentiful was found similar to the research before.

对水稻基因组中各成分的微卫星进行统计分析，结果表明：微卫星在基因的编码区和非编码区都有分布，主要是数量上的差异；在数量关系上，非编码区的微卫星含量大大高于编码区，但是三核苷酸微卫星相反；在水稻EST中微卫星含量非常丰富；在微卫星motif长度使用上，二核苷酸微卫星的含量最高，且以at/ta微卫星占大多数；比较籼稻和粳稻基因组上的微卫星，发现它们在含量、组成和motif使用频率上都非常相似。

The bar code subsystem generates the data of bar code/clearance code in batch and produce labels, the resource seller glues the labels on the resource and puts into the resource collector, retains the clearance encoding label, the measuring subsystem scans the bar code on the resource and weighs valuation, and produces bar code/purchase price data, and the data of bar code/clearance code and the data of bar code/purchase price is induced into the defraying subsystem, and the purchase price of resource is transferred to the seller presetting account by the defraying subsystem according to the clearance encoding.

条码子系统批量生成条码/结算编码数据并制作标签，资源交售人在资源上粘贴条码标签并投入资源收集容器，留存结算编码标签，计量子系统扫描每个资源的条码并称量计价，生成条码/价款数据，然后将条码/结算编码数据和条码/价款数据导入支付子系统，支付子系统凭借结算编码将其对应的资源价款转入交售人预先开设的账户。

Total RNAs from KAx-3 cells and AK127 cells(developed for 14h) were isolated. After the reverse transcription and PCR reaction, two distinct differential fragments were acquired., fragment A was from KAx-3 cells and fragment C was from AK127 cells. After retriving and reamplifying the differentially expressed fragments, white-blue plaqueselection, the fragments were purified. Northern blot proved that fragment A was from KAx-3 cells and fragment C was from AK127 cells. The results of sequencing and researching for NCBI database have been showed: part sequence of fragment A shows 91% similarity to the gene encoding DhkA, 92% similarity to the gene encoding DhkF, 91% similarity to the gene encoding STATc, 97% similarity to the homoeobox gene encoding protein. These genes play important part in controlling cell differentiation and cell proportion in Dictyostelium discoideum.

本研究通过提取盘基网柄菌发育14小时的野生型KAx-3细胞和突变型AK127细胞的总RNA，运用mRNA差异显示法分离出了两条明显的差异表达片段，其中片段A来自野生型KAX-3细胞，片段C来自突变型Ak127细胞；并通过凝胶回收差异片段、对差异片段进行再次PCR、蓝白斑筛选克隆、提取质粒、酶切电泳纯化差异片段；接着进行Northern杂交的结果表明，片段A只与野生型KAx-3细胞的总RNA有杂交信号，片段C只与突变型AK127细胞的总RNA有杂交信号，这就排除了差异片段假阳性的可能；最后通过测序，搜索NCBI BLAST数据库发现：片段A的小部分序列与编码组氨酸激酶DhkA基因中一段序列的相似性高达91%，与编码组氨酸激酶DhkF基因中的一段序列相似性高达92%，与编码STATc蛋白基因的一段序列相似性达91%，以及与编码同源框蛋白的基因中的一段序列相似性达97%，这些基因在盘基网柄菌细胞分化和细胞比例调控过程中起着相当重要的作用，这些数据进一步说明了突变细胞不能完成发育的原因。

Firstly , this article introduced the encoding and decoding principle of two kinds of coding technology, space time code uses the difference space time grouping code, the Turbo code uses two recursions systems convolution code the encoder parallel cascade, the decoding uses the SOVA algorithm.

本文先介绍两种编码技术的编解码原理，其中空时编码采用差分空时分组码，Turbo编码采用两个递归系统卷积码编码器的并行级联，译码采用SOVA算法。

We found that neither the fusioned nor the non-fusioned forms of Hu-P68 cDNA open reading frame could express efficiently in the E. coli cells; in different prokaryotic expression vectors and under various promotors resulted in no distinctive variations. Deletion of 5'UTR by synthesis adaptors, deletion of 3'UTR or signal peptide sequence by PCR gained no gross improvement. Only the truncated API-I proteins were observed to be highly expressed when the 3'ORF fragment of the Hu-P68 cDNA was fusioned at the 3'end of PAI-I gene.

结果发现无论是以融合形式存在，还是以非融合形式存在，人的P68 cDNA基因在E.coli细胞中都未能获得高效表达：在不同表达载体中，不同启动子对P68 cDNA基因的表达没有显著差异；利用合成Adapter的方法删除5'UTR，及利用PCR技术删除3'UTR和信号肽序列对表达没有明显改善；分别表达被分割的P68 cDNA5'端编码区、中央编码区和3'端编码区均未见有明显表达；当P68 3'端编码区与高效表达蛋白PAI-Ⅰ基因3'末端融合时，仅见有PAI-Ⅰ以截断形式高效表达出来。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了