A map traceability management scheme for security control

ABSTRACT

A map traceability management scheme for security control is proposed utilising visual cryptography and Quick Response Code. The map information is classified into two categories: the public information MPI and the traceable map information MTI, and they are both converted into QR codes. Map shares MS and control shares CS are generated according to extended multiple visual cryptographic scheme. MPI can be obtained by scanning the MS, while MTI can be got by overlaying the MS on CS which is only accessible to management units, so it can identify every map and provide the basis for the traceability management.     

A SURVEY OF JEL CODES: WHAT DO THEY MEAN AND ARE THEY USED CONSISTENTLY?

The use and prevalence of JEL code categorization is wide in the field of economics, but what do JEL code classifications actually tell us? And are they used with consistency by academics in the field? Utilizing a data set of articles published in the American Economic Review from 1990 to 2008, we investigate whether there is heterogeneity in JEL codes assignments between authors and editors. We find that there is. A secondary goal of this paper is to survey overall thematic trends in JEL code usage over the past four and a half decades. One result is that JEL category M: Business Economics, in particular, appears to be thematically and spatially distinct from much of the rest of the published literature in the top general interest journals in the field.     

VHF/UHF无线高速数据传输中的级联编码

介绍了在VHF/UHF无线通信系统中进行高速数据传输时 ,采用RS码与卷积码的级联码对传输的数据纠错编码以及对提高数据传输可靠性的影响 ,并在加性高斯白噪声信道环境下对能够达到的误码性能进行了仿真分析。     

MT—2B2B线路码的应用

本文在深入研究MT—2B2B线路码的基础上,通过大量实验来分析该码在不同信道上的传输特性,并说明了其应用特点。     

基于软件无线电的WCDMA仿真平台

本文介绍了一种关于3G的仿真平台的研究、开发和验证。结合软件无线电思想，参照3GPP协议，在COSSAP软件包中搭建起一个具有通用结构的、基于第三代WCDMA、FDD方式的下行链路物理层的仿真平台，并进行了Turbo编译码、RAKE接收机等3G关键技术的研究和单路数据业务、单路话音业务及多业务复用时系统性能的仿真验证。仿真结果与相关文献拟合得较好，结果证明可以把它作为进一步研究软件无线电中关键技术的基础平台。     

A catalogue of three-level regular fractional factorial designs

A common problem that experimenters face is the choice of fractional factorial designs. Minimum aberration designs are commonly used in practice. There are situations in which other designs meet practical needs better. A catalogue of designs would help experimenters choose the best design. Based on coding theory, new methods are proposed to classify and rank fractional factorial designs efficiently. We have completely enumerated all 27 and 81-run designs, 243-run designs of resolution IV or higher, and 729-run designs of resolution V or higher. A collection of useful fractional factorial designs with 27, 81, 243 and 729 runs is given. This extends the work of Ch93, who gave a collection of fractional factorial designs with 16, 27, 32 and 64 runs.     

民法本位研究创新构想

民法本位与民法价值、民法原则、民法典制定以及人、人生、人权等都存在内在联系。民法本位是民法元 理论中的重要内容,可目前对其研究还相当薄弱。民法本位是民法的出发点,民法价值是民法本位的指归,它们在实 然法中的外化即是民法原则。当吸收多学科理论研究民法本位,构想民法本位研究的创新体系。     

射频识别技术在汽车生产现场二级仓库中的应用

分析了条形码作为信息载体在汽车生产现场二级仓库应用中存在的不足。RFID技术的发展及应用,为进一步解决仓库作业问题提供新的方法;提出利用RFID技术与条码技术在仓库中的综合应用方案,达到优势互补、扬长避短的效果。     

码域滤波的基本原理

本文基于DS－CDMA系统中的线性多用户检测提出了码变换、离散码变换的概念，主要阐述码／时域滤波的基本原理，指出线性多用户检测是一种码／时域滤波，但是有关码变换阵的研究有待深入。     

补码键控技术及其在无线局域网中的应用

补码键控技术是一种多进制编码扩频技术。本文介绍了该技术的相关函数特征及序列结构，并以无线局域网基带处理器HFA3861A为例，介绍了CCK扩频调制方式的典型应用。