NFIQ 2.0用于指纹质量控制的可行性及方法

目的测试NFIQ 2.0标准计算指纹质量评分模块在活体采集和油墨捺印指纹质量控制上的可靠性,研究利用NFIQ 2.0指纹分值综合判断指纹质量的可行性和在实际工作中的使用方法。方法一是利用NFIQ 2.0模块接口程序结合VS2015 C#编程语言制作指纹质量评分软件。二是记录20张指纹图片放置在采集框上、下、左、右、中五个位置时NFIQ 2.0的分值,计算平均偏差、最大偏差和相对偏差。三是对在指纹数据库中随机选出的1334枚活体采集和油墨捺印指纹(8位灰度、500 dpi BMP格式指纹图片)进行评分,将得出的分值与通过人工检查该1334枚指纹在指纹系统中自动提取的特征所计算的特征准确率,形成线条图并制作拟合线,通过线条图和拟合线研究NFIQ 2.0分值与特征准确率之间存在的关系。结果从平均偏差、最大偏差和相对偏差分析,指纹图片放置位置对NFIQ 2.0分值的影响很小。利用线条图和拟合线进行统计时,NFIQ 2.0分值与特征准确率之间呈现出一定的对应关系,NFIQ 2.0分值高的指纹,系统自动提取的特征准确性相对较高,反之相对较低。并且,分值在41~100之间时,特征准确率稳定在80%以上。结论NFIQ 2.0标准计算指纹质量评分模块可以用于大批量活体采集和油墨捺印指纹的辅助质量检测,在实际工作中可将NFIQ 2.0模块嵌入活体采集软件和指纹系统档卡扫描中,设定合理的阈值,对提高指纹采集的质量检测效率和提升指纹采集质量将有较大帮助。     

批评语言学视域中“雷”的社会符号意蕴

批评语言学,又叫批评语篇分析,是现代语言研究的一个新分支,它综合了语言学、社会学、心理学、人种学、大众传媒等多门学科的研究成果,用适当的语言学方法,联系相关的历史与社会语境,揭示语言使用、意识形态和话语权势之间的关系。本文将用批评语言学的一个模式——社会符号学,以当今中国网络流行语言“雷”为研究对象,进行批评语篇分析。旨在揭示“雷”产生的社会原因及其代表的意识形态和话语权威斗争。     

The rise of flex crops and commodities: implications for research

As a concept and phenomenon, ‘flex crops and commodities’ feature ‘multiple-ness’ and ‘flexible-ness’ as two distinct but intertwined dimensions. These key crops and commodities are shaped by the changing global context that is itself remoulded by the convergence of multiple crises and various responses. The greater multiple-ness of crops and commodity uses has altered the patterns of their production, circulation and consumption, as novel dimensions of their political economy. These new patterns change the power relations between landholders, agricultural labourers, crop exporters, processors and traders; in particular, they intensify market competition among producers and incentivize changes in land-tenure arrangements. Crop and commodity flexing have three main types – namely, real flexing, anticipated/speculative flexing and imagined flexing; these have many intersections and interactions. Their political-economic dynamics involve numerous factors that variously incentivize, facilitate or hinder the ‘multiple-ness' and/or ‘flexible-ness' of particular crops and commodities. These dynamics include ‘flex narratives' by corporate and state institutions to justify promotion of a flex agenda through support policies. In particular, a bioeconomy narrative envisages a future ‘value web’ developing more flexible value chains through more interdependent, interchangeable products and uses. A future research agenda should investigate questions about material bases, real-life changes, flex narratives and political mobilization.     

Outline Shape Analysis on the Trochlear Constriction and Olecranon Fossa of the Humerus: Insights for Sex Estimation and a New Computational Tool,

Sex estimation through visual analysis of the distal humerus can contribute to establishing the biological profile of an unidentified skeletal individual. Using statistical shape modeling, the trochlear constriction open curves and olecranon fossa closed outlines of 151 humeri were digitized and analyzed. The shape configurations exhibited strikingly different degrees of sexual dimorphism when evaluated using linear discriminant analysis with leave‐one‐out cross‐validation. The trochlear constriction performed poorly, correctly classifying 63.6% of the individuals. However, the olecranon fossa showed high sexual dimorphism, presenting a 94.0% accuracy. A simpler model using only two principal components was also generated. While the accuracy is slightly inferior (88.1%), it has the advantage of being constrained to bidimensional components that were translated into morphoscopic variables within a simulator interface. This allowed us to implement the method through a web application that does not require users to be trained in landmark digitization or have knowledge of geometric morphometrics.     

The role of memes in the construction of Facebook personae

Abstract

This research is based on the assumption that social media sites – such as Facebook, Twitter and YouTube – have changed the way in which memes (culturally transmitted ideas) are transmitted or spread. It is argued that social media have provided the most fertile environment for the replication of memes to date. The social networking site Facebook is the main social media example used throughout the research. The way in which Facebook is represented in film, as well as the ways in which the offline lives of the characters are affected by their social media profiles, specifically as depicted in the film Catfish (Joost and Schulman 2010) are analysed. Lastly, it is argued that one can construct an entirely new persona, or merely experiment with different aspects of who you are, on social media sites. This online persona can be influenced by the memes one chooses to spread online. Naturally, all memes carry connotations, values and judgements. These memes collate with one's profile and, thus, the connotations attached to the memes one shares are then associated with one's online persona/profile. It is found that although a social networking user tries to portray him/herself in an idealised manner, these memetic connotations give a true impression of his/her offline persona. As a result, there is not much difference between the user's online and offline personae.     

Do Online Election Campaigns Win Votes? The 2007 Australian “YouTube” Election

Studies of Web use during elections have focused mainly on the content of Web sites and on the major factors driving parties' and candidates' adoption of the technology. Evaluations of the electoral impact of Web campaigns have been more limited. This article examines the nature and extent of Web use by voters and parties in the 2007 Australian federal election, focusing particularly on the consequences of Web 2.0 campaigning for candidate vote share. The findings show differing levels of commitment to older and newer e-campaigning technology across parties and their supporters and significant electoral advantages are associated with minor parties candidates using Web 2.0 campaign tools. The results confirm existing studies' findings about the impact of Web campaigns on contemporary elections, but that these effects are moderated by the type of Web tools used and party using them.     

浅析网络犯罪的刑事管辖权

网络犯罪的新特点向传统的刑事管辖权提出了挑战,网络犯罪刑事管辖权问题成为了刑法理论界和司法实务的焦点.从网络犯罪的概念不难看出,传统管辖权理论在适用于网络犯罪时存在诸多的不足.在处理因为网络犯罪而产生的刑事管辖权的竞合问题时,应保持谨慎的态度,在维护本国主权的同时避免侵害他国主权,应坚持主权平等原则、可能性、便利性原则...     

基于OAI-PMH的DSPACE元数据接口研究

在以汇文图书集成管理信息系统为代表的文献资源管理共享系统中贮藏着数以亿计的符合CNMARC标准的数据信息,但识别CNMARC格式需要特定系统的支持。为解决其数据信息的Web2.0应用问题,采用OAI-PMH协议提供的元数据挖掘和收割技术,对汇文系统的CNMARC数据和基于Dspace系统的学术典藏库的都柏林元数据格式的接口进行研究和分析,得出数据移植的具体实现方法。     

论网络爬虫的刑事合规

网络爬虫本身是一种中立性的技术应用,但由于适用情景的多样性以及技术原理的复杂性,其确实存在一定的刑事风险。就网络爬虫的治理而言,其重点不是对越过合法边界的技术行为进行刑事处罚,而是在进行刑事规制时尽可能地确保合法的爬虫应用不受干扰。对此,有必要引入刑事合规理念,针对网络爬虫的规制构建专项合规规则。一方面,应充分重视网络爬虫的技术特点以及该技术所蕴含的信息自由、数据经济以及技术创新等积极利益;另一方面,需要根据现有刑法规范准确分析网络爬虫技术所涉及的刑事责任,在犯罪预防的基础上为网络爬虫技术的适用创造宽松的环境。     

校内网,你还能走多远

最近，校内网以它自己的特色打开了大学生市场。故从市场背景中分析校内网兴起的原因，校内网的营销模式，现在已有的成就，成功的原因，及与市场同类产品对比校内同的优势与不足。