共查询到20条相似文献,搜索用时 15 毫秒
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V. I. Donskoy 《Cybernetics and Systems Analysis》2012,48(2):233-241
The paper presents a general approach to the evaluation of the complexity of classes of algorithms, so-called pVCD-method. To develop this method, all the examined families of models of empiric generalization were restricted to classes
implementable on computers and, wider, by examining their partially recursive representations. Within the framework of the
algorithmic approach, the concept of Kolmogorov’ complexity of algorithms for the recognition of properties or the extraction
of regularities is proposed. The method proposed to evaluate the nonrandomness of the extraction of empirical regularities
is based on this concept. 相似文献
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机械臂绝对定位精度测量 总被引:2,自引:1,他引:1
提出了用激光跟踪仪标定机械臂的D-H参数、测量机械臂绝对位姿以及对机械臂的绝对定位精度进行分析的方法;用激光跟踪仪测量机械臂各个关节单独运动时得到的一系列离散点,就可确定机械臂各个关节的轴线,由此建立机械臂的D-H坐标系,并对D-H参数进行标定;然后,给出了由6D激光头位姿确定机械臂末端位姿的方法;最后,推出了由测量位姿值与命令位姿值相比较,得到机械臂绝对定位的位置和姿态偏差的方法;这些方法可以有效、迅速地完成对机械臂绝对定位精度的测量. 相似文献
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机车空调逆变电源设计 总被引:1,自引:0,他引:1
本文讨论的是机车空调逆变电源系统的设计与研究。该电源系统主要是由DC/DC的BOOST升压部分和DC/AC三相逆变部分两部分组成。DC/DC部分所得直流电压通过DC/AC部分逆变成三相交流电,供给空调机组工作。同时,为使电源系统能更可靠的运行,也设计了相应的故障检测、保护等辅助电路。 相似文献
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《Computers & Mathematics with Applications》2006,51(3-4):451-466
In spite of being a classical method for solving differential equations, the method of variation of parameters continues having a great interest in theoretical and practical applications, as in astrodynamics. In this paper we analyse this method providing some modifications and generalised theoretical results. Finally, we present an application to the determination of the ephemeris of an artificial satellite, showing the benefits of the method of variation of parameters for this kind of problems. 相似文献
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对国网宁夏电力检修公司宁安运维站近2年来一次设备喷涂PRTV用量的统计数据进行分析整理,得出各类一次设备按照标准要求喷涂PRTV时的用量估算值,并针对现存作业中存在的问题,提出相应解决方案。 相似文献
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Computer-aided analysis of autoradiographic films of DNA fragments is presented. The Powell least-squares procedure is used for optimization of parameters for components of complex densitometric curves. Since each densitometric spectrum may be divided for several non-overlapped blocks of bands, there is no upper limit on the number of parameters which must be optimized. Eight shapes for the component bands are utilized: symmetric and asymmetric Gauss and Cauchy functions, direct, symmetric and asymmetric product of Gauss function and inverse of Cauchy function, and log-normal function. The probability of DNA cleavage is calculated with correction for multiple cuts. The methods presented was applied to detailed analysis of densitometric spectra of a 21-bp DNA restriction fragment and allowed for direct correlation between structural microheterogeneity of DNA and the resulting cutting pattern. This method should facilitate the analysis of densitometric data from antibiotic-induced cleavage of DNA and footprinting experiments. 相似文献
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A solution of the problem of identification of the time shift of pseudorandom sequences received against a background of interference is proposed. The solution is based on a nonlinear probabilistic criterion—the criterion of minimum a posteriori integral estimation error. An algorithm of nonlinear parametric identification that yields a solution of the problem is synthesized. A numerical example of the identification of the time shift of a concrete sequence that confirms the effectiveness and adequate degree of efficiency of the algorithm proposed in the study is presented. 相似文献
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针对高速电路系统的传输线信号完整性问题,通过对高速电路PCB上传输线等效电路的分析,给出了信号传输时产生反射现象的原因;介绍了常用的消除反射的方法,即选择均匀传输线、采用合适的拓扑结构布线和阻抗匹配法,指出阻抗匹配法可解决信号传输的反射现象;阐述了源端阻抗匹配法和负载端阻抗匹配法消除反射的原理和适用条件。针对时钟电路中的反射问题,采用PADS/Hyperlynx软件对阻抗匹配法进行仿真,结果表明,阻抗匹配法能够改善信号传输的反射现象。 相似文献
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This paper deals with the robust root locus problem of a polytope of real polynomials. First, a simple and efficient algorithm is presented for testing if the value set of a polytopic family of polynomials includes the origin of the complex plane. This zero-inclusion test algorithm is then applied along with a pivoting procedure to construct the smallest set of regions in the complex plane which characterizes the robust root loci of a polytope of polynomials. 相似文献
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提出了一种准确分割骨骺兴趣区域边缘位置的方法。针对手腕骨X线片图像的特征,采用Gibbs 随机场对兴趣区域进行初始分割,将骨从图像中分割出来;针对骨与软组织的灰度值相差不大,Gibbs 随机场正确分割困难的问题,再进一步利用主动轮廓法对初始轮廓进行改善,将软骨与软组织准确分割开,从而得到了正确的骨的边缘位置。实验验证了该方法对分割出的底部区域骨的轮廓线有较大的改善,同时这种联合的方法具有较强的抗噪声能力。 相似文献
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直方图规定化可以将图像的直方图转化为需要的形状,有目的地增加某个灰度区间的图像,使用户获得感兴趣的信息.本文介绍了直方图规定化的两种经典的实现算法--单映射规则(SML)和组映射规则(GML)的基本原理,并应用这两种算法对实例图像进行规定化处理和比较分析,证明了GML相对于SML的优越性. 相似文献
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B. A. Romov 《Cybernetics and Systems Analysis》1989,25(3):300-306
We construct a series of maximum subalgebras of direct products of algebras of finite-valued logics, which are subdirect products of the corresponding Boolean algebras. We show that subdirect products make the largest contribution to the number of maximum subalgebras. The completeness problems is solved in the algebra of vector Boolean functions.Translated from Kibernetika No. 3, pp. 11–16, May–June, 1989. 相似文献
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提出了一种基于区间数据分布特征的决策表连续属性离散化的方法。方法在断点的选择上考虑了属性值的出现频率,在区间内的一致性和区间之间的差异性基础上,利用条件信息量作为反馈信息合并区间。通过实验分析表明了算法的有效性,能保持决策表较高的分类能力,提高约简效率。 相似文献
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吴枫 《单片机与嵌入式系统应用》2012,12(3):26-28,36
传统的物联网传感节点多采用电池供电,大大限制了传感器节点在更加恶劣的环境中工作的可靠性。同时,大量电池的使用和更换,既浪费了人力也给环境带来了污染。射频无线供电将使传感器节点彻底摆脱传统电池供电的种种束缚与弊端,通过高频信号输出、高频放大器、势垒稳压电路、动态释放电路等模块进行非接触式的微电量传输。本文分析了物联网以及无线供电在国内外的发展现状,并对以上各核心电路模块进行了设计与描述,最后总结了射频无线供电在物联网领域的应用前景。 相似文献