多相位信号灯的优化——可变车道灯的设置

文章对多相位信号灯交叉路口的交通情况进行了简要分析,认为只有设置可变车道灯才可能解决平面交叉路口的拥堵问题.并对设置可变车道灯的可行性进行了分析.     

Positions and saliency of immigration in party manifestos: A novel dataset using crowd coding

Immigration is one of the most widely debated issues today. It has, therefore, also become an important issue in party competition, and radical right parties are trying to exploit the issue. This opens up many pressing questions for researchers. To answer these questions, data on the self‐ascribed and unified party positions on immigration and immigrant integration issues is needed. So far, researchers have relied on expert survey data, media analysis data and ‘proxy’ categories from the Manifesto Project Dataset. However, the former two only give the mediated party position, and the latter relies on proxies that do not specifically measure immigration. The new dataset presented in this article provides researchers with party positions and saliency estimates on two issue dimensions – immigration and immigrant integration – in 14 countries and 43 elections. Deriving the data from manifestos enables the provision of parties’ unified and unfiltered immigration positions for countries and time points not covered in expert surveys and media studies, making it possible to link immigration and immigrant integration positions and saliency scores to other issue areas covered in the Manifesto Project Dataset. Well‐established criteria are used to distinguish between statements on (1) immigration control and (2) immigrant integration. This allows for a more fine‐grained analysis along these two dimensions. Furthermore, the dataset has been generated using the new method of crowd coding, which allows a relatively fast manual coding of political texts. Some of the advantages of crowd coding are that it is easily replicated and expanded, and, as such, presents the research community with the opportunity to amend and expand upon this coding scheme.     

英语教育的劳动市场回报及英语教育政策调整 —— 基于 2016年问卷调查数据

中国的英语教育近年来受到越来越多的重视。无论是国家还是个人都投入了大量资源用于英语教育,如此巨额的投入所带来的劳动市场回报值得关注。英语教育的劳动市场回报可以分为人力资本投入回报和信号作用回报。研究发现,英语在实际工作中使用越多,工资收入越高,是为英语教育作为人力资本投入回报的证据。但在工作中很少用到英语的人,通过英语四六级考试对其工资也有显著影响,反映了英语教育具有信号作用的功能。调查显示,英语教育的信号作用是英语教育劳动市场回报的主要方面。因此,中国的英语教育有过度教育从而导致资源配置低效率之嫌,建议及时调整国家的英语教育政策。     

软件无线电接收通道关键技术分析与应用

本文基于软件无线电的一种典型结构对软件无线电接收系统中的一些关键技术进行了讨论,并结合一个实际系统进行了数学分析。     

反测试的手段及应对策略探析

在多导仪测试中出现的“反测试”会干扰测试人员对图谱的分析，本文通过分析对抗型和功利型两类反测试者，发现其反测试的方式主要是通过抑制相关问题（靶问题）的反应或增强对准绳问题（背景）的反应来实施，最常用的手段是体能性反测试和精神性反测试。针对其反测试的方式和手段，制定相关的应对策略。     

伪狂犬病病毒闽A株糖蛋白gD基因去信号肽片段在大肠埃希氏菌中的表达

应用PCR方法从包含伪狂犬病病毒(PRV)Fa株糖蛋白gD基因的重组质粒pB13中扩增出糖蛋白gD基因去信号肽片段,将其克隆到大肠埃希氏菌表达载体pThiohisA中。测序结果表明,糖蛋白gD基因去信号肽片段长1 155 bp,与PRV Fa株糖蛋白gD基因完全一致。经1mmol/L IPTG诱导后,重组质粒pThiohisA-gD在大肠埃希氏菌XL1-blue、Top10、DE3和DH5α中均得到表达,其中在宿主菌XL1-blue中表达量最高。Western-blotting结果显示,大肠埃希氏菌XL1-blue表达的糖蛋白gD具有免疫原性。     

A New Anti‐forensic Scheme—Hiding the Single JPEG Compression Trace for Digital Image

To prevent image forgeries, a number of forensic techniques for digital image have been developed that can detect an image's origin, trace its processing history, and can also locate the position of tampering. Especially, the statistical footprint left by JPEG compression operation can be a valuable source of information for the forensic analyst, and some image forensic algorithm have been raised based on the image statistics in the DCT domain. Recently, it has been shown that footprints can be removed by adding a suitable anti‐forensic dithering signal to the image in the DCT domain, this results in invalid for some image forensic algorithms. In this paper, a novel anti‐forensic algorithm is proposed, which is capable of concealing the quantization artifacts that left in the single JPEG compressed image. In the scheme, a chaos‐based dither is added to an image's DCT coefficients to remove such artifacts. Effectiveness of both the scheme and the loss of image quality are evaluated through the experiments. The simulation results show that the proposed anti‐forensic scheme can verify the reliability of the JPEG forensic tools.     

Identification of Mobile Phone and Analysis of Original Version of Videos through a Delay Time Analysis of Sound Signals from Mobile Phone Videos

This study designs a method of identifying the camera model used to take videos that are distributed through mobile phones and determines the original version of the mobile phone video for use as legal evidence. For this analysis, an experiment was conducted to find the unique characteristics of each mobile phone. The videos recorded by mobile phones were analyzed to establish the delay time of sound signals, and the differences between the delay times of sound signals for different mobile phones were traced by classifying their characteristics. Furthermore, the sound input signals for mobile phone videos used as legal evidence were analyzed to ascertain whether they have the unique characteristics of the original version. The objective of this study was to find a method for validating the use of mobile phone videos as legal evidence using mobile phones through differences in the delay times of sound input signals.     

基于心音信号的生物识别技术研究

文章提出了一种新的基于心音信号的生物识别技术。首先对心音信号进行预处理,并提取其Mel频率倒谱系数MFCC,通过高斯混合模型（GMM）对提取到的特征值进行训练,选择合适的GMM阶数,实现了利用心音信号对身份的识别认证,并取得了满意的实验结果。     

改革开放 40 年来中国企业员工集体离职机制的 典型案例研究

企业员工集体离职对相关组织和员工群体影响深远。本研究从 1978—2021 年中国知网（CNKI） 4 类论文数据库及报纸 1 类新闻数据库中，甄选出我国 102 个企业员工集体离职典型案例。研究发现：集体离 职集中发生在时代的热门行业、朝阳产业，其中制造业、IT 业的集体离职始终处于焦点；集体离职的主要原 因是个体自身因素、企业内部因素以及二者互动因素；集体离职的直接原因同样主要在内因，成为集体离职的 “导火索”或“催化剂”。研究提炼出企业员工集体离职影响因素和作用机制模型、企业员工集体离职主要原 因和直接原因作用模型。基于此，研究建议：预防集体离职需整体上更加关注企业的内部管理，化解集体离职 需避免主要原因的积累，缓解集体离职还需注意直接原因的作用。