基于神经网络方法的风机故障诊断

针对旋转机械故障征兆与故障模式映射的复杂性,将反向传播(BP)网络、径向基(RBF)网络和概率网络(PNN)用于风机进行故障诊断,并比较了3种网络的诊断精度。以风机振动信号的7段频谱能量峰值作为故障特征,采用训练好的神经网络进行故障辨识,结果表明,RBF网识别精度高于PNN网络,BP网络表现较差。     

基于LabVIEW的滚动轴承故障智能诊断系统

利用LabVIEW平台开发了齿轮故障诊断系统。系统主要采用共振解调诊断和BP神经网络诊断两种方法。共振解调诊断由Hilbert解调和小波包解调实现故障频率识别;BP神经网络诊断由对有量纲和无量纲参量提取的特征以及根据小波相对能量提取的特征作为神经网络的输入向量,轴承的故障类型作为输出向量,采用神经网络对轴承进行诊断,实验结果表明:通过解调和神经网络诊断,该系统能有效识别齿轮故障,确定故障类型。     

基于资金流的云南省绿色食品企业BP神经网络财务风险评价模型的研究

本文选取了52家绿色食品上市企业3年的156组数据作为样本,选择25个指标为研究目标,在已准备好的归一化数据、两种检验通过适合因子分析的条件下,提取特征值大于1的7个主成分作为输入变量的前提运算下,选择适合此模型的参数,运用试凑法得到隐含层数,训练出有一定精度的BP神经网络,并对该网络进行了仿真,结果证明该网络可以用于云南省绿色食品企业财务风险评价以及预测。     

BP神经网络和Duffing系统结合的超声导波管道检测研究

针对管结构中微小缺陷的定性分类问题,本文提出了一种基于深度学习和Duffing系统结合的超声导波管道检测研究。将BP神经网络与传统的超声导波技术相结合,对数值模拟信号分别提取小波变换得到的小波系数能量值,以及10个时域特征值,同时引入Duffing振子中的分维数缺陷识别方法,实现了管道缺陷中凹陷、裂缝、孔洞三种缺陷的分类识别。实验结果表明：在处理数值模拟管道超声导波信号的分类问题上,基于传统特征选取办法的BP神经网络识别准确率为86.35%,加入三个混沌系数后准确率提升至91.85%。     

P2P流量识别的ANN模型研究

提出一种新的P2P流量识别方法,该方法以流量行为特征作为流量类型识别的依据,建立BP神经网络模型.与已有的多种P2P流量识别技术相比,其具有泛化性高,自学能力强,效率和准确性的优点.     

螺杆泵工况检测及故障诊断系统设计方法

本文通过对石油用螺杆常见工况故障的系统分析,总结性的阐述了工况故障常见的表现形式。并以此为基础对相应的诊断方法做进一步说明。最后又进一步提出了基于BP神经网络的螺杆泵机组故障诊断网络的设计方法。     

基于RBF神经网络的过程质量诊断研究

对控制图模式识别方法的提高与改进是改善过程工业质量诊断和质量控制的关键。利用RBF神经网络设计了过程质量诊断模型,然后用K-means聚类算法确定隐含层RBF神经网络节点数,最小二乘学习算法对网络进行学习训练,并利用MATLAB7.0对网络进行仿真,结果表明该方法比传统方法能够较快地识别出控制图的异常模式,且具有较高的识别精度,能够达到过程质量诊断的要求。     

基于遗传神经网络的机械故障诊断

本文针对BP神经网络存在的不足,将遗传算法和BP神经网络有机结合起来,利用遗传算法的全局搜索能力优化了神经网络的初始权值和阈值,并将其应用于机械故障诊断。结果表明,在MATLAB环境下进行仿真试验,这种方法能够有效进行故障识别、提高故障诊断精度。     

基于WT-CNN深度学习的轴承故障识别

针对传统轴承故障识别方法的识别率低以及人工干涉等问题。提出了一种基于时频图和深度神经网络（WT-CNN）轴承故障类别的自动识别方法。首先采用连续小波变换（CWT）将原始信号转为时频图,然后将其输入VGG-16神经网络模型中的卷积网络层（CNN）进行特征自动提取,并使用softmax层完成识别。实验结果表明,该方法可以准确地识别轴承故障类别,其准确率达到100%。因此与其他神经网络和传统机器学习方法相比,WT-CNN神经网络模型能有效对轴承故障类别完成识别任务。     

基于分形理论和神经网络的雷达信号识别算法

针对现有新体制雷达信号不断增加,传统的识别参数难以满足识别效果的问题,提出了基于分形理论和神经网络的雷达信号识别算法。利用关联维数可以衡量信号的关联复杂度特征的特性,对不同复杂度特性的雷达信号进行特征提取,由于提取的关联曲线不具有很好的线性特性,提取关联点作为神经网络的输入进而进行识别分类。仿真实验表明,这种基于分形理论和神经网络的雷达信号识别算法在较低信噪比下具有较高的识别效果,且可以适合于各种体制雷达信号的特征提取与识别。     

Development in Information and Communications Technology (ICT) Statistics at the Australian Bureau of Statistics

This paper outlines the ICT statistical developments that the ABS has undertaken over recent years. These developments have been on both the supply side (ICT industry) and the demand side (use of IT by sector). The content of ABS ICT surveys has changed significantly over the last few years and are expected to develop further in line with industry changes and emerging policy needs.
Recent developments in household collections have been the inclusion of IT use questions in the 2001 Census of Population and Housing and in various ABS social surveys such as Children's Participation in Culture and Leisure Activities. Annual business IT use surveys are now conducted and include topics such as Internet commerce and IT security. Biennial ICT industry surveys are conducted to provide data on ICT production, imports and exports, ICT industry employment, performance and structure information. An Internet activity survey is run every six months and provides regional Internet access details and infrastructure details on Internet service providers.
A major development for 2002–03 will be the compilation of an ICT satellite account. ABS intends to produce an ICT Information Development Plan to guide its future statistical development work in the ICT field.     

Value at Risk in the Suburbs: Eminent Domain and the Geographical Politics of the US Foreclosure Crisis

Several US counties and local governments have recently considered a novel solution to the foreclosure crisis. They plan to use eminent domain to compel the owners of mortgage debt—and specifically of private‐label mortgage‐backed securities—to sell the debt to the government at a price reflecting the loan's market value. The government would then restructure the debt and resell it to new investors. The plans are striking because—in contrast to both development‐driven eminent domain and the federal subprime bank bailout—they would force investors to assume asset devaluation and increased long‐term risk. Notably, the plans have emerged as an instance of financialization‐focused politics in suburbs and suburban cities of color, specifically majority‐black and ‐Latino/a suburbs. Local support for the plans, we argue, is rooted in the long‐term disinvestment of these ‘suburbs of exception', which became targets of subprime lending and eventually sites where the ‘financial exception' has been localized. But these demographic shifts, fragmentation and fiscal pressures have at the same time created a suburban political terrain in which the plans have gained their strongest political support.     

Towards a Theory of Serendipity: A Systematic Review and Conceptualization

Serendipity – the notion of making surprising and valuable discoveries – plays a major role in the success of individuals and organizations alike. Previous research has established the importance of serendipity and identified important individual- and organizational-level antecedents. However, the literature has been dispersed and the boundaries of the concept have been blurry, leading to a lack of conceptual clarity and structure, and thus limiting validity and managerial actionability. Based on a systematic literature review, I synthesize existing management-related research on serendipity and explicate the emergence and composition of serendipity in the organizational context. I first identify three necessary conditions that differentiate serendipity from related concepts such as luck or targeted innovation: agency, surprise, and value. Then, I draw from the literature on sensemaking, event-based theorizing, and quantum-based approaches to management to conceptualize the process of cultivating serendipity in the organizational context as a process of enabling potentiality and materialization, and develop a multi-level theory of (cultivating) serendipity. This conceptualization contributes to our collective understanding of how, why, and when (i.e., under what conditions) organizations can leverage the value in the unexpected, which opens up fruitful avenues for further research.     

Accountability of NGOs in Bangladesh A critical overview

NGOs in Bangladesh have been recognized as effective change agents in the socio-economic arena throughout the world. Their contributions in micro credit, non-formal education and primary health care are widely known. NGOs play a significant role in society. NGO accountability, as a result, has become a critical issue. NGO accountability in Bangladesh has been examined here in relation to patrons, clients and themselves. Of the three relationships only accountability to patrons is in a near satisfactory state. Accountability to clients is handicapped by lack of opportunities of beneficiaries to participate meaningfully in NGO policy making. Accountability to themselves is adversely affected due to the adherence to a strictly hierarchical system and the influence of founding and charismatic NGO leaders.     

Towards an Asian model of human resource management? A comparative analysis of China,Japan and South Korea

There has been much discussion regarding the possible decline and weakening of national systems of human resource management (HRM). Yet, culture and institutions are often cited as the major stumbling blocks to this outcome. Such constraints may dissipate in the analysis, particularly if ‘regional clusters’ are considered where geographic and cultural closeness and ‘openness’ to similar economic pressures exist. In such cases, it might be postulated that convergence in HRM will occur. We argue that China, Japan and South Korea represent such a cluster. This article examines these countries, to see if a degree of convergence is taking place and if it is towards an identifiable ‘Asian’ model of HRM. A model of change is presented that distinguishes between levels of occurrence and acceptance. Details of the development and practice of HRM in each country are then set out. The article ends with a discussion and implications section and a brief conclusion.     

The Creation of the Office for National Statistics

A new Office for National Statistics was created in the United Kingdom in 1996 following a series of developments designed to strengthen the relevance and integrity of statistics. This paper describes these fundamental changes and sets out a blueprint for future progress. It also sets current developments in the United Kingdom in an historical and international context.     

What helps? Women engineers' accounts of staying on

We have considerable understanding of the obstacles that women engineers encounter and the reasons that they leave the field, but we know less about what enables them to remain. Adopting an interpretivist approach, this article examines how a group of British women engineers in two FTSE 100 companies account for “staying on” in their male‐dominated work settings. We delineate four specific forms of help that facilitate women's retention in the field. We argue that exposure to help leads to women developing a habitus that enables them to continue working in engineering. To conclude, we draw on our findings to outline HR practices that will facilitate supportive relationships in the workplace and pave the way towards developing more positive organisational climates.     

论现代物流企业的发展观

物流业经过诸多年的发展目前已经成为最热门的行业之一,物流企业的注册数量也与日俱增,达到前所未有的规模。毋庸置疑,任何企业都希望自己迅速做强做大,并成为真正现代物流企业的典型代表,要实现这一目标一个首要问题就是要解决现代物流企业的发展观问题。     

浅谈大体积混凝土裂缝的控制

大体积混凝土的裂缝问题是实际工程中长期困扰工程技术人员的问题,其控制技术的研究是混凝土结构研究的热点问题,具有重大的学术价值和潜伏的工程背景。     

Supply Chain Strategies in the UK Fashion Industry—The Rhetoric of Partnership and Realities of Power

This paper focuses on the fashion industry, one characterised by issues such as dramatic shifts in the scale and power of major retail buyers in the market, the advent of retailer own brands, and the nature of sourcing and supply chain decisions, issues that are increasingly global in nature. The aim of this research is to explore the nature of relationships between UK high street multiple fashion retailers and their contracted suppliers, many of whom are entrepreneurial firms by most definitions of the term. Four core themes emerge from the literature and provide a framework for the research, namely, power, process, partnership, and people. The research approach was qualitative, and conducted over a period of twelve months. The paper ends with an agenda for future research.