共查询到20条相似文献，搜索用时 250 毫秒
1.
Internet的出现，为人类的协同活动与工作提供了一个美好的数字化环境，同时也导致了各种各样非秩序化的病态社会现象的发生。通过讨论网络社会病态问题的基本现象网络犯罪和网络沉溺，分析其存在的客观性复杂性，提出了防治网络社会病态问题的一些对策。 相似文献
2.
3.
4.
目前,随着大地测量技术的迅速发展,在大地测量界对病态问题处理的精度和准确度的要求越来越高,人们所采用的数据处理手段也应随之发展。如何充分考虑大地测量实际,探讨有偏估计和观测方程直接解算的新方法,以满足大地测量发展的需要,是大地测量学者面临的一个新任务。 相似文献
5.
本文回顾了整整一百年前在法国发生的"N射线事件"的始末,讨论了朗缪尔针对这一事件和其他几件事例提出来的"病态科学"概念.作者认为,病态科学的概念没有区分科学界内部的失误和科学界受到外部伤害这两种不同情况,不利于我们自觉抵制科学所受到的外部干扰和压制,保证科学的健康发展. 相似文献
6.
超现实主义是现代主义文学思潮的重要分支,作为一种文学流派,主张凭借心理的自动来挖掘文学艺术对人类本能世界的开拓与延伸,不受理性的控制,也没有任何美学的或道德的顾虑。而冯至早年的代表作《蛇》体现了超现实主义的具体特征,其中的“蛇”和“花朵”都是性的隐喻,这种隐喻的手法表现出的抽象欲望隐含了心理压抑的病态症候。传统评论往往停留在文本的浅层次上,而对该诗中所呈现出的文化、心理等的深层内涵及其原因阐释不足。 相似文献
7.
《废都》中主人公庄之蝶的形象是具有典型意义的,小说记叙了他在20世纪末时代变革中精神和生活的迷惘、挣扎、奋斗,和最终的失败与堕落。他的悲剧性的一生概括了那个时代的一部分文人的生活和精神状态,造成其悲剧命运的原因是多方面的,本文将着重从庄之蝶病态精神产生的社会、个人原因进行探究。 相似文献
8.
本文提出了基于小波变换的非平稳时间序列分解方法。通过小波分解,将原时间序列依尺度分解成不同层次,利用尺度系数作为季节性乘积分量,将小波系数序列处理为方差平稳的平稳序列,并应用于样本数据异常点的识别和修正,使模型的预测精度得到提升。实例验证该方法是有效的。 相似文献
9.
《废都》中主人公庄之蝶的形象是具有典型意义的,小说记叙了他在20世纪末时代变革中精神和生活的迷惘、挣扎、奋斗,和最终的失败与堕落。他的悲剧性的一生概括了那个时代的一部分文人的生活和精神状态,造成其悲剧命运的原因是多方面的,本文将着重从庄之蝶病态精神产生的社会、个人原因进行探究。 相似文献
10.
ADF与PP法在非对称单位根检验中的应用研究 总被引：3，自引：0，他引：3
经济理论认为许多经济变量具有非时称的阚值自回归调整行为.而标准的单位根检验ADF和PP法都是基于线性自回归模型而构造的,因此对非对称单位根检验并不适用.本文应用Monte-Cado模拟方法对ADF和PP检验在TAR与M-TAR模型下的检验势进行系统研究.并对模拟结果的产生原因进行了深入分析.模拟结果表明:数据的非对称性程度和数据的均值回复时间是影响ADF和PP检验的最主要因素;当非对称性增强和均值回复时间增大时,ADF和PP的检验势都具有较大幅度的下降,但是PP比ADF法具有更大程度的下降. 相似文献
11.
为了提高高维数据集合离群数据挖掘效率,在分析了传统的离群数据挖掘算法优点和缺点的基础上,提出了一种离群点检测算法,首先将非线性问题转化为高维特征空间中的线性问题,然后利用非线性数据变换进行维数约减,对从高维采样数据中恢复得到低维数据集,通过本文提出的离群数据假设,并结合本文给出的离群聚类方法对所得数据对象投影分量是否是离群数据进行判别。仿真实验的结果表明了该方法能够有效地发现高维数据集中的离群点。与此同时,该算法具有参数估计简单、参数影响不大等优点,为离群点检测问题的机器学习提供了一条新的途径。 相似文献
12.
Wei Zheng Hongbin Wang Changchun Hua Zhiming Zhang Hongrui Wang 《Journal of The Franklin Institute》2018,355(16):7962-7984
This paper addresses the interval type-2 fuzzy robust dynamic output-feedback control problem for a class of nonlinear continuous-time systems with parametric uncertainties and immeasurable premise variables. First, the parametric uncertainties are assumed to be a subsystem based on the control input matrix and output matrix, and described as a linear fractional. Secondly, the nonlinear continuous-time systems are described by the interval type-2 fuzzy model. Thirdly, the new dynamic output feedback controller is designed based on the interval type-2 fuzzy model and the linear fractional (parametric uncertainties), the sufficient conditions for robust stabilization are given in the form of linear matrix inequalities (LMIs). Compared with previous work, the developed methods not only have abilities to handle the fuzzy system with immeasurable premise variables but also can deal with the parametric uncertainties effectively. The results are further extended to a mobile robot case and a chemical process case. Finally, two simulation examples are performed to show the effectiveness of the propose methods. 相似文献
13.
《Journal of The Franklin Institute》2022,359(18):10849-10866
This paper considers neural network solutions of a category of matrix equation called periodic Sylvester matrix equation (PSME), which appear in the process of periodic system analysis and design. A linear gradient-based neural network (GNN) model aimed at solving the PSME is constructed, whose state is able to converge to the unknown matrix of the equation. In order to obtain a better convergence effect, the linear GNN model is extended to a nonlinear form through the intervention of appropriate activation functions, and its convergence is proved through theoretical derivation. Furthermore, the different convergence effects presented by the model with various activation functions are also explored and analyzed, for instance, the global exponential convergence and the global finite time convergence can be realized. Finally, the numerical examples are used to confirm the validity of the proposed GNN model for solving the PSME considered in this paper as well as the superiority in terms of the convergence effect presented by the model with different activation functions. 相似文献
14.
文章研究了线性切换系统的鲁棒跟踪控制,并提出可解性的充分条件。设计切换控制规则使得切换线性系统满足加权H∞参考模型,并采用平均驻留时间法和Lyapunov函数来处理稳定性分析和控制器设计。通过使用线性矩阵不等式,控制器设计问题可以得到很好的解决。 相似文献
15.
为及时有效地识别潜在技术机会,采用文本挖掘和异常值检测的方法,提出一种基于专利文本的技术机会识别方法.首先采用文本表示模型Doc2vec技术对专利摘要进行建模,以更深层表征文本语义信息;然后利用基于密度的离群值检测算法,识别出具有潜在技术机会的专利方向;最后以深度学习领域潜在技术识别为例,构建专利检索式并收集458条专利文献作为数据集.实证结果总结出4类主题共10个潜在的技术机会,验证了该基于专利的技术机会识别方法的有效性,可为企业相应技术应用、研发和创新提供参考. 相似文献
16.
回归系数一类线性估计的小样本性质 总被引：1，自引：0，他引：1
提出了线性模型中回归系数的一类线性估计.在均方误差矩阵(MSEM)准则和Pitman Closeness(PC)准则下,研究了这类线性估计相对于最小二乘(LS)估计的优良性.最后,讨论了当设计阵为非列满秩时,回归系数的可估函数的一类线性估计的优良性. 相似文献
17.
In this paper, we design two distributed output consensus controllers for heterogeneous linear systems based on internal model principle and then study the quantization effect on the controllers when uniform quantizers are used in the communication channels. The first controller considers the general situation when the internal model state matrix of the system may be unstable and the communication graphs are strongly connected directed graphs. We prove that the bound of the consensus error is proportional to the quantizer parameter with a coefficient related to the size of the network and the property of the communication graphs. The second controller considers the situation when the internal model state matrix is neutrally stable and the communication graphs are undirected connected graphs. In this case, we derive a better bound of the consensus error which is proportional to the quantizer parameter and the coefficient is unrelated to the size of the network when the linear systems are homogeneous. Simulation examples are provided to illustrate the theoretical results. 相似文献
18.
多元线性模型中最小二乘估计新的相对效率 总被引：2，自引：0，他引：2
定义了广义行列式的概念，并在多元线性模型中，引入了回归系数的最小二乘估计与最佳线性无估计的一种新的相对效率．利用广义行列式的性质和矩阵分析的方法，通过对相对效率下界的研究，推广了Bloomfield-Watson定理。 相似文献
19.
In this paper, a coopetitive output regulation problem is considered for general linear multi-agent systems with antagonistic interactions, where not all the agents have access to the state, the output, the system matrix and the output matrix of the exogenous system or exosystem. In this sense, the internal model incorporation of the system matrix of the exosystem is also only available to some agents. Thus, we propose distributed observers for each agent: (i) To estimate the state, the output, the system matrix and the output matrix, and (ii) the unavailable internal model of the exosystem. Then, a distributed dynamic output feedback controller is proposed for each agent to solve the coopetitive output regulation problem. The exponential stability of the closed-loop system is analyzed with the output regulation theory. Finally, some simulation results are presented to validate the proposed control strategy. 相似文献
20.
R. Raja U. Karthik Raja R. Samidurai A. Leelamani 《Journal of The Franklin Institute》2013,350(10):3217-3247
This paper addresses the problem of global exponential dissipativity for a class of uncertain discrete-time BAM stochastic neural networks with time-varying delays, Markovian jumping and impulses. By constructing a proper Lyapunov–Krasovskii functional and combining with linear matrix inequality (LMI) technique, several sufficient conditions are derived for verifying the global exponential dissipativity in the mean square of such stochastic discrete-time BAM neural networks. The derived conditions are established in terms of linear matrix inequalities, which can be easily solved by some available software packages. One important feature presented in our paper is that without employing model transformation and free-weighting matrices our obtained result leads to less conservatism. Additionally, three numerical examples with simulation results are provided to show the effectiveness and usefulness of the obtained result. 相似文献