一种基于Radon变换的微表情识别算法

微表情是人们处在一些与平时生活环境不同的高强度环境下试图控制和掩饰的情感表现,也是一种不曾意识到的瞬时脸部表情,持续时间短,强度弱。为了提高其准确率,提出了基于Radon变换的微表情识别算法。首先,对数据库中的视频序列进行灰度归一化、尺寸归一化和二维主成分分析法（Two-dimensional Principal Component Analysis,2DPCA）降维预处理,使用光流法对降维后图像提取运动特征;然后使用Radon变换算法对光流图像进行处理,得到对应微表情的特征值和特征图像;最后使用支持向量机进行微表情分类识别。实验结果表明,使用Radon变换后得到的微表情特征图像得到了较好的识别效果,在微表情数据集CASME和CASMEⅡ上识别率分别为81.48%和82.17%,通过与选取的其他方法对比说明了该方法具有更好的识别性能。     

摩托车单向器自动装配机气动系统设计

针对当前摩托车单向器组件主要采用手工装配、装配效率低、随机性大、无法对装配过程实现有效管理控制的情况,为了易于对零件装配过程进行实时监测和提高生产效率,开发了一种智能摩托车单向器自动装配机。介绍了摩托车单向器自动装配机的上料系统、装配系统、检测系统和落料系统的机械结构,重点阐述了设备的气动系统设计,并进行了实验研究。结果表明,该设备可实现组成单向器的5种零件自动上料和装配,同时降低了操作人员的劳动强度,生产效率提高约50%。其气动系统噪音小、工作可靠,可应用于摩托车单向器的大批量生产。研究结果可为其他相似异形零件自动装配机的开发提供参考。     

谈数控机床故障诊断与维修教学的几点体会

数控机床故障诊断与维修课程是培养数控技术实用型人才的一门重要专业课,它的教学效果直接影响到数控技术人才的培养规格和质量。本文结合自己从事数控机床故障诊断与维修的教学及工作经验,介绍在数控机床故障诊断与维修教学中的一些方法和体会。     

规则模糊系统和ICA在图像识别中的应用

利用模糊系统中的模糊规则和SVM中内积函数之间的关系,通过支持向量机对训练样本进行学习,由支持向量确定模糊规则,构建基于规则的模糊分类器。对人脸图像做独立成分分析,提取有利于分类的面部特征的主要独立成分。该模糊系统在ORL人脸库上的实验结果表明,该方法同样适合解决小样本、非线性、高维模式的分类问题。     

Public system usability analysis for the valuation of cognitive burden and interface standardization: A case study of cross-ATM design

Humans are unable to effectively handle machines that have poor interface and interaction patterns. The Automated Teller Machine (ATM) is one of the machines that is most frequently operated by a wide spectrum of people. Hence, it is common to apply Human–Computer Interaction (HCI) technology in the design of ATMs. User–ATM interaction, however, has barriers such as a user’s working memory limit, lower literacy level, or lack of awareness and access. Moreover, the diversity of interfaces hurt user motivation, perception, and experience significantly. For example, each bank has its own ATM design targeting its customers only and, thus, when clients of other banks come across such a machine, they suffer from cognitive burden and commit many errors. To this end, we conduct an analytical survey of ATMs used in Pakistan through user analysis and heuristics analysis. We figure out the influence of design diversity and user perception on ATM users’ cognitive stress with the cognitive walkthrough analysis on the survey. We also uncover a realism-usability gap by reviewing the sampled ATM screens from the viewpoint of HCI heuristics. Finally, we suggest the guidelines on the cross-ATM design, characterized by the standardized fast-cash menu and the fail-safe mechanism for novices. This study demonstrates that users are reluctant to switch out of their comfort zones, due to learning costs and a lack of motivation. Therefore, we should design public systems in a very standardized way, which becomes more crucial for a user’s cognitive relief as interface and design patterns are becoming more diverse in our daily lives.     

Disaggregating and reaggregating work: Workers,management and the struggle over creating coherency and purpose in a context of work degradation

The article argues that whilst there is a growing sense of degradation and worsening conditions (disaggregation) of work in the cleaning sector in general, there are some important contradictions which require complex organisational responses. In the main, there is a growing sense of isolation in this work, yet also a growing perception of autonomy and workers having to use discretion in new and challenging ways. This article focuses on these issues and management responses to reaggregate the nature of such work, creating new forms of identity and activities intended to enhance (or address) the levels of stability and sustainability at work as well as in operational processes. This management conundrum means that they need to deal with a range of job‐related, skill‐oriented worker learning and also representation issues. These responses bring to the fore the contested nature of such forms of work and how they are changing.     

盾构机直接切削玻璃纤维筋洞门进洞技术

玻璃纤维筋是一种非常适用于NOMST工法的材料。文章介绍了玻璃纤维筋的物理力学性质。以珠江三角洲城际轨道交通广州至佛山段土建12标(西朗—鹤洞)盾构区间工程为应用背景,介绍了玻璃纤维筋围护桩的施工技术及盾构机采用NOMST工法直接切削玻璃纤维筋围护桩洞门进洞的施工技术。初步探讨了进洞过程中盾构推力对车站接收端墙的作用,采用有限元法进行了模拟分析,并在此基础上提出了NOMST工法进洞时盾构推力的确定方法。     

下动式折弯机几何精度调整

文章以AMADA公司生产的RG系列折弯机为例,介绍下动式折弯机几何精度调整的方法,为同类设备精度调整提供了参考。     

DATUM面控制技术在包边机设计中的应用

在UG平台上进行汽车门盖类包边机设计时，运用DATUM面对各设计者的设计区域进行控制，可以有效地避免各工作者所设计出的主压机构或预压机构出现干涉，也能很好地保证各设计者所设计出的机构之间不出现间隙。文章通过对N300尾门包边机的设计进行分析，阐述了DATUM面控制技术在包边机设计中的运用。     

煤矿综机现状与发展趋势分析

本文首先对我国煤矿综机发展现状进行了介绍,在对国内外存在差距进行分析的同时,对煤矿综机发展趋势进行了探讨,并提出了有关建议。