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排序方式: 共有979条查询结果,搜索用时 15 毫秒
91.
A generalized prototype-based classification scheme founded on hierarchical clustering is proposed. The basic idea is to obtain a condensed 1-NN classification rule by merging the two same-class nearest clusters, provided that the set of cluster representatives correctly classifies all the original points. Apart from the quality of the obtained sets and its flexibility which comes from the fact that different intercluster measures and criteria can be used, the proposed scheme includes a very efficient four-stage procedure which conveniently exploits geometric cluster properties to decide about each possible merge. Empirical results demonstrate the merits of the proposed algorithm taking into account the size of the condensed sets of prototypes, the accuracy of the corresponding condensed 1-NN classification rule and the computing time. 相似文献
92.
The main result of the paper states that almost any analytic single-input control system, which is truly nonlinear, that is not feedback linearizable, with controllable linearization at an equilibrium point, does not admit any symmetry preserving that point. By almost any system, we mean that we exclude a small class of odd systems, that admit just one nontrivial symmetry conjugated to minus identity. The obtained results are based on a recent classification of nonlinear single-input systems under formal feedback. We also describe symmetries of feedback linearizable systems. 相似文献
93.
Claudio Rocchini Paolo Cignoni Fabio Ganovelli Claudio Montani Paolo Pingi Roberto Scopigno 《The Visual computer》2004,20(2-3):149-164
A new algorithm for the integration of partially overlapping range images into a triangular mesh is presented. The algorithm consists of three main steps: it locates the intersections between the range surfaces and a reference grid chosen by the user, then merges all nearly coincident and redundant intersections according to a proximity criterion, and, finally, reconstructs the merged surface(s) from the filtered intersection set.
Compared with previous methods, which adopt a volumetric approach, our algorithm shows lower computational costs and improves the accuracy of the surfaces produced. It takes into account the quality of the input measurements and is able to patch small holes corresponding to the parts of the 3D scanned object that were not observed by the acquisition device.
The algorithm has been tested on several datasets of range maps; graphical and numeric results are reported. 相似文献
94.
CSCW中的对象同步与合并 总被引:11,自引:0,他引:11
为了满足响应时间以及可靠性的要求,协同应用通常采用全复制的体系结构.由此带来的一个巨大挑战就是如何保证复制在各个协作站点处的对象的一致性以及获得一个公共状态,总结了在线和离线两种协作模式下的不同需求,在此基础上给出了相应的控制机制——在线模式下的对象同步算法和离线模式下的对象合并算法.这些机制已经在协作支撑平台Cova系统中实现,实际的应用表明,这些措施与其他机制一起能够很好地满足协同应用数据一致性的要求。 相似文献
95.
96.
97.
谢勰 《西安邮电学院学报》2007,12(3):98-100
利用逻辑化简方法,给出了程序设计中的逻辑分解技术。分解技术能化简逻辑判断中的冗余命题,减少判断的运行时间。讨论了搜索技术的递归中如何使用分解技术。此外,对于划分类型的判断,分解技术退化成集合归并方法,化简判断更为方便。在实际程序设计中,合理使用分解技术能有效提升算法性能,使程序更为清晰易懂。 相似文献
98.
99.
提出了一种基于滤波器组的单载波频域均衡(FB-FDE)技术的窄带干扰抑制方法,该方法在多径时延较大的地空宽带通信中具有很强的窄带干扰抑制能力。从理论上详细分析了基于滤波器组的窄带干扰抑制技术能够克服基于FFT频域均衡缺点的主要原因,并在此基础上提出了基于自适应子带合并的算法。理论分析和仿真试验均表明,该方法抑制窄带干扰能力强,运算简单,适于工程实现。 相似文献
100.
S. Suzuki 《Journal of Superconductivity and Novel Magnetism》2007,20(4):293-303
We propose an effective interaction approach to superconducting systems which is adapted to periodic systems and intermediate
net coupling between charge carriers by phonon mediated and Coulomb repulsive interactions. A coupling function of effective
interaction is given for homogeneous field beyond the weak coupling approximation by using a generalized intermediate coupling
method. Adequate kernel for the periodic systems is also reduced to that coupling function in homogeneous field and the Fourier
coefficients relevant to the Bloch function. Within the present approach we discuss the symmetry of the superconducting gap
in cuprate under the assumption that a nonbonding band filled by 2p_σ electrons exists in an undoped system and that doped holes occupy orbitals in this band. Those orbitals are represented
by linear combinations of p
x and p
y functions. It is argued, in the tetragonal limit, that the symmetry of the gap function is d-wave-like on account of the
products of orbital functions in combination of singlet spin-pair in the kernel. 相似文献