共查询到20条相似文献，搜索用时 15 毫秒
1.
Citizens as consumers: Profiling e-government services’ users in Egypt via data mining techniques 总被引：1，自引：0，他引：1
This study uses data mining techniques to examine the effect of various demographic, cognitive and psychographic factors on Egyptian citizens’ use of e-government services. Data mining uses a broad family of computationally intensive methods that include decision trees, neural networks, rule induction, machine learning and graphic visualization. Three artificial neural network models (multi-layer perceptron neural network [MLP], probabilistic neural network [PNN] and self-organizing maps neural network [SOM]) and three machine learning techniques (classification and regression trees [CART], multivariate adaptive regression splines [MARS], and support vector machines [SVM]) are compared to a standard statistical method (linear discriminant analysis [LDA]). The variable sets considered are sex, age, educational level, e-government services perceived usefulness, ease of use, compatibility, subjective norms, trust, civic mindedness, and attitudes. The study shows how it is possible to identify various dimensions of e-government services usage behavior by uncovering complex patterns in the dataset, and also shows the classification abilities of data mining techniques. 相似文献
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云计算环境下,数字图书馆虚拟机面临的安全威胁日益严重。本文首先分析了云计算环境下数字图书馆虚拟机存在的安全漏洞和威胁,然后提出了全面的虚拟机安全管理方案。该方案能有效提高云计算环境下数字图书馆虚拟机及整个虚拟化系统的安全性。 相似文献
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黄勇 《科学技术与辩证法》2011,(3):72-75
以齿轮为核心部件的自动机器对近代科学的建立起了非常重要的作用。首先,齿轮式钟表提供了精确计时的手段,促进了科学实验的发展;其次,齿轮机构承受了来自蒸汽机的巨大动力压力,使得印刷机等自动机器得以面世,推动了近代科学的形成与发展;最后,自动机器直接演化为自动计算机器,其影响力一直持续到今天。 相似文献
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这篇论文研究用状态机控制SIP通信中语音编解码的协商,旨在实现用状态机控制SIP通信中服务器正确选择语音编解码,帮助服务器快速和正确实现种类繁多的语音编解码协商,进而真正意义上完成了SIP通信的语音编解码的协商工作。 相似文献
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One of the most significant recent technological developments concerns the development and implementation of ‘intelligent machines’ that draw on recent advances in artificial intelligence (AI) and robotics. However, there are growing tensions between human freedoms and machine controls. This article reports the findings of a workshop that investigated the application of the principles of human freedom throughout intelligent machine development and use. Forty IS researchers from ten different countries discussed four contemporary AI and humanity issues and the most relevant IS domain challenges. This article summarizes their experiences and opinions regarding four AI and humanity themes: Crime & conflict, Jobs, Attention, and Wellbeing. The outcomes of the workshop discussions identify three attributes of humanity that need preservation: a critique of the design and application of AI, and the intelligent machines it can create; human involvement in the loop of intelligent machine decision-making processes; and the ability to interpret and explain intelligent machine decision-making processes. The article provides an agenda for future AI and humanity research. 相似文献
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Ryan Tonkens 《Ethics and Information Technology》2012,14(2):137-149
The emerging discipline of Machine Ethics is concerned with creating autonomous artificial moral agents that perform ethically
significant actions out in the world. Recently, Wallach and Allen (Moral machines: teaching robots right from wrong, Oxford
University Press, Oxford, 2009) and others have argued that a virtue-based moral framework is a promising tool for meeting this end. However, even if we
could program autonomous machines to follow a virtue-based moral framework, there are certain pressing ethical issues that
need to be taken into account, prior to the implementation and development stages. Here I examine whether the creation of
virtuous autonomous machines is morally permitted by the central tenets of virtue ethics. It is argued that the creation of
such machines violates certain tenets of virtue ethics, and hence that the creation and use of those machines is impermissible.
One upshot of this is that, although virtue ethics may have a role to play in certain near-term Machine Ethics projects (e.g.
designing systems that are sensitive to ethical considerations), machine ethicists need to look elsewhere for a moral framework
to implement into their autonomous artificial moral agents, Wallach and Allen’s claims notwithstanding. 相似文献
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Reinhold Rüdenberg 《Journal of The Franklin Institute》1942,234(1):39-61
The sudden development of short-circuit currents, and of recovery voltages at interruption of currents, depends on the effects of stator and rotor leakages as well as of saturation in the generating synchronous machines.The non-linear problem of the interaction of these features with the performance of the main windings and auxiliary damper circuits is solved analytically.This leads to a simple graphical representation which is numerically determined by the well-known magnetic and electric characteristics of machine and network and by two time constants of very different magnitudes which are derived from the ordinary data of the machines. Hence the variation with time, of short-circuit currents and of recovery voltages, can easily and rigorously be computed for every given example.The deviations of actual damper circuits from the ideal form and the effects of eddy currents in solid steel parts of the rotor are discussed so far that numerical results can be derived readily.A new transient test for synchronous machines is suggested by which rotor and stator leakage voltages can be measured separately, avoiding the uncertainties of the usual steady state leakage tests. 相似文献
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本设计是在MGI50（4MG200）系列滚筒采煤机的基础上进行的,保持了原系列采煤机的使用条件、基本结构、技术特征、组成部分和特点,以及相关配套设备.为了使本设计具有更大的适用性,对部分零部件在原性能的基础上进行适当的改进,加强高压水射流发生装置的适用性,使之能给多种机型的采煤机配套使用,以期创造更高的生产效率和经济效益.本设计主要是研究高压水射流在采矿工程上的应用之一即高压水射流采煤机.是在原双滚筒采煤机的基础上引入高压水射流技术,通过改进喷雾方式提高降尘、破煤效果,使之相结合为新型的采煤机. 相似文献
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In this paper the problem of memoryless discrete time detection of a constant signal in additive φ-mixing noise is considered. The fidelity criterion is taken to be the asymptotic relative efficiency. The optimal detector nonlinearity is approximated by a polynomial, and the statistical knowledge required for the design of the detector is the family of joint moments of the noise, resulting in a very simple design procedure for the detector. It is shown that the performance of this detector can be made arbitrarily close to that of the optimal memoryless detector for a large class of noises. 相似文献
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句型转换的机器翻译理论模型与一些处理方法 总被引：3，自引：0，他引：3
自动分词和译文生成处理是混合式汉英机器翻译的两个重要阶段。本文主要工作有：第一，讨论了机器翻译的理论模型；第二，给出了一个自动分词算法，提出了一个初步消歧方法；第三，建立汉英机器翻译的时态转换及相关匹配规则。 相似文献
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介绍了当前数控机床广泛采用的回零工作原理,详细分析了发生故障的主要原因.根据数控机床回零时典型故障的具体实例,总结出数控机床回零故障发生的主要形式和规律,及对所发生的回零故障进行诊断、排除和维修的方法. 相似文献
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大型机器具有一定的危险性,安全防护装置的使用可以有效地提升产品的安全性能,消除或减少机器使用中的危险情况。通过对安全技术的介绍,机器危险情况的分析与危险评估,提出了安全防护的方法。采用安全防护装置与安全产品,取得了较好的效果,最后介绍了安全防护实例。 相似文献
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Machine learning tools are increasingly infiltrating everyday work life with implications for workers. By looking at machine learning tools as part of a sociotechnical system, we explore how machine learning tools enforce oppression of workers. We theorize, normatively, that with reorganizing processes in place, oppressive characteristics could be converted to emancipatory characteristics. Drawing on Paulo Freire’s critical theory of emancipatory pedagogy, we outline similarities between the characteristics Freire saw in oppressive societies and the characteristics of currently designed partnerships between humans and machine learning tools. Freire’s theory offers a way forward in reorganizing humans and machine learning tools in the workplace. Rather than advocating human control or the decoupling of workers and machines, we follow Freire’s theory in proposing four processes for emancipatory organizing of human and machine learning partnership: 1) awakening of a critical consciousness, 2) enabling role freedom, 3) instituting incentives and sanctions for accountability, and 4) identifying alternative emancipatory futures. Theoretical and practical implications of this emancipatory organizing theory are drawn. 相似文献
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A.W. Simon 《Journal of The Franklin Institute》1944,238(1):39-48
A detailed analysis, based on a consideration of charges and potentials, is made of the action of two simple electrostatic alternators; a four-symmetric, four carrier, machine, and a trisymmetric, six carrier, machone.Each of the machines is the prototype of a whole family of polysymmetric electrostatic alternators, and the method of analysis is extended to the generalized machine of each type. A basis for a qualitative theory of electrostatic alternators is evolved. 相似文献
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《Journal of The Franklin Institute》2019,356(14):7689-7703
This paper investigates the benefits of the inerter in improving vibration suppression of milling machine tools. The traditional method for repressing the cutting vibration of milling machines includes applying passive mechanical networks that consist of masses, dampers, and springs. However, because the mass element is not a genuine two-terminal network element, the achievable performance of the passive mechanical networks might be restricted. The inerter was invented to substitute the mass element and has been successfully applied to many mechanical systems, such as vehicles and buildings. This paper extends the application of the inerter to a milling machine and discusses the resulting vibration suppression improvements. We first built a model of the milling machine via experiments, followed by applying three basic suspension layouts to the model and illustrating how the inerter can help reduce system vibration. Lastly, we conducted experiments to verify the effectiveness of the inerter in improving the manufacturing performance of the milling machine. 相似文献
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机器翻译的涉及的技术很多,单词处理是其中的一个重要核心.本文主要介绍单词处理的一些技术,其工作有三部分:第一部分提出最大匹配分词的改进算法;第二部分探讨汉英机器翻泽时名词的单复数处理算法;第三部分给出词性兼类处理的一些方法. 相似文献
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IZ-41型祥乐牌微耕机是广西陆川县永发机械有限公司集成多项自有的国家专利技术开发的目前国内最轻型、最高效的机型,其机质轻、结构紧凑、灵活性好、操作力小,耕作效率高、耗油低、购置和使用经济,能行走大小道路、自行越埂爬坡;由于采用组合结构、标准化部件以及设计合理,操作简便灵活、部件更换联接便捷快速、无作业死区;既适应于丘陵、小地块的水田、旱地、梯田,又具有耕培土、开垅、深耕翻土、旋耕耙田、收割、脱粒、运输及抽水等一切农作功能。这种新式经济型多功能微耕机,适合我国南方地区甚至东盟国家农地丘陵环境、农作习惯以及经济条件等要求。 相似文献
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从大历史观角度来看,文明进步、发展模式、世界格局、科技创新、中国发展都处在重大转折期。全球创新活动进入一个新的密集期,绿色、健康、智能引领创新方向,人工智能、新能源技术、新生物技术等多点突破、交叉汇聚,颠覆性技术不断涌现,新科技革命加速产业变革。以人为本的人机物三元融合社会孕育兴起,人与自然和谐相处,成为伙伴关系;人工智能等新科技将改变人与机器的关系,可能使机器从人类的工具和从属,逐步上升为伙伴。雄安新区因疏解而生、应创新而起、逐智能而强,新一轮科技革命和产业变革是雄安新区建设最大的变量和增量,在未来建设中,应采取"国家创新特区"的体制,充分用好新科技革命的成果,积极探索人机物三元融合社会下的未来城市新形态。 相似文献