世界各国(或地区)推进RFID的策略

介绍了一些国家和地区发展RFID的政策和推进措施，总结了各国发展RFID的共性。     

Global Structure-Acute Toxicity Relationships for Mice Using Structural Parameter Ratios: New Approach to Molecular Design and Screening

Abstract

A method for a preliminary survey of the relationship between molecular structure and performance was described using 1506 random data of structure-acute toxicity for mice (intravenously dosed). The structural patterns of the weakest toxic structures (111) were extracted from the data and the patterns discriminated for 64.2% of the other structures (1395). As for the 826 structures of strongest toxicity, 78.3% were discriminated by these structural patterns. These results were obtained by using structural parameter ratios to describe the structural patterns and the exhaustive elimination process to select the best parameter ratio from many candidates. The results were summarized in the form of a chart which can be used for practical screening for the weakest toxic structures.     

Performance analysis of multi‐antenna relay communication systems with MRC

The performance of multi‐antenna relay communication systems is investigated in this letter. The source broadcasts the signal to all the relays and the destination. Decode‐and‐forward scheme is adopted at the relays, and the destination employs maximum ratio combining (MRC) technique to maximize the received signal‐to‐noise ratio. Closed‐form expressions of outage probability are derived in the MRC case and minimum routes MRC case. An adaptive grouping algorithm of relay antennas is also presented under the constraint of total antenna number. Simulation results show that the analytical curves agree with the simulated ones very well, and the performance of the proposed grouping algorithm is very close to the upper bound mentioned in other papers. Copyright © 2012 John Wiley & Sons, Ltd.     

基于RFID的智能跟踪机器人的设计

针对国内各种智能机器人的智能跟踪难这一现状,设计出一种基于RFID技术的智能跟踪的机器人,能实现对携有特定电子标签的目标进行实时跟踪。该机器人以STC89C51单片机为核心,采用有源RFID读写器(HR6020C)和电子标签(WS-HT06)构建定位系统,采用单片机控制L298来驱动机器人的两个后轮,整个系统通过单片机进行整合、计算、处理数据,并发出指令,控制机器人对目标进行跟踪,进而达到机器人的智能跟踪的目的。实验结果表明,该机器人达到了智能跟踪的要求。     

Click‐Tag and Amine‐Tag: Chemical Tag Approaches for Efficient Protein Labeling In Vitro and on Live Cells using the Naturally Split Npu DnaE Intein

Protein labeling with synthetic moieties remains in many cases a technically challenging or unresolved task. Two new and simple concepts are presented. In both approaches, a very short tag of only a few amino acids is prepared with the desired chemical modification and, in a second step, it is transferred to the protein of interest by protein trans‐splicing. For the amine‐tag, a recombinant intein fragment free of lysine residues was generated such that the amine group of the N terminus could be selectively modified with regular amine‐reactive reagents. Thus, standard bioconjugation procedures without any chemical synthesis could be applied without modification of lysines in the protein of interest. For the click‐tag, protein trans‐splicing was combined with unnatural amino acid mutagenesis and subsequent bioorthogonal side chain modification, as demonstrated for click chemistry using p‐azidophenylalanine. By the two‐step strategy, exposure of the protein of interest to the copper catalyst was avoided.     

基于输出频谱和支持向量机的模拟电路故障诊断方法

针对模拟电路的特点和其故障诊断中存在的问题,提出了一种基于输出频谱和支持向量机的新型模拟电路故障诊断方法(FMSVM)。该方法采用多音信号作为模拟电路的激励信号,并用其输出频谱中的有限个频率点的幅值作为故障特征,采用多分类支持向量机(MSVM)进行故障模式判别,实现了模拟电路的故障诊断。实验结果表明,该故障诊断方法具有速度快、准确率高的特点,具有重要的实用价值。     

软交换机的关键技术研究与设计

探讨了软交换中多协议导致的复杂性,研究了协议组内及协议组间的协议关系处理,设计了通用PDU,考虑了软交换的可扩展性,可用性方面的问题.借鉴SIP-T协议的机制,在通用PDU中广泛采用信息翻译和信息封装共存的方式,实现了系统的高效性和信息的完整性.揭示了协议关系分类和协议分组对软交换设计的必要性和有效性.最后利用UML对软交换进行了设计.     

基于聚类分析的微博用户标签自动生成

基于用户发表的微博内容进行标签的自动生成,主要研究的是基于聚类分析的用户标签自动生成.本文首先介绍用到的关键技术:聚类技术和TextTank,提出了Baseline系统,接下来详细说明了基于聚类分析的标签自动生成方法,最后通过实验对该方法进行了分析和评价.实验结果表明,该方法生成的用户标签能够有效地解决同义标签的堆积问题,使得生成的标签能够在更多的维度上体现用户的兴趣.     

分组自适应分配时隙的RFID防碰撞算法研究

为了解决射频识别(Radio Frequency IDentification,RFID)系统中的多标签防碰撞问题,在分析帧时隙ALOHA算法的基础上,提出一种基于分组自适应分配时隙的RFID防碰撞算法(GAAS).首先让阅读器对标签随机所选的时隙进行扫描统计,并将其发送给每一个标签,标签再进行相应地时隙调整,使阅读器跳过空闲时隙和碰撞时隙,自适应地分配有效时隙,进而对标签进行快速识别.当未识别标签数比较大时,算法采用分组以及动态调整帧长等策略,以减少时隙处理的时间.仿真结果表明:GAAS算法提高了系统的识别效率和稳定性,降低了传输开销.特别是当标签数超过1000时,该算法的吞吐率仍保持在71%以上,比传统的帧时隙ALOHA-256算法和分组动态帧时隙ALOHA算法的系统效率分别提高了300%和97.2%.     

基于Logistic映射和z-映射的图像分组加密算法

针对图像加密,提出了一种基于Logistic映射和z-映射的图像分组加密算法,该算法在每一轮迭代中,交替使用矩阵置乱、非线性数值替换和数值关联混迭三级操作。经大量实验验证,该算法能够有效抵抗明文攻击、差分攻击、统计分析,密钥空间较大,因而安全性较高,并且加解密速度相当快,适用于数据存储。