【摘 要】
:
在空间聚类中,最佳聚类数k求解的聚类数k必须是事先给定的确定值,然而,实际中k很难被精确地确定,使得该算法对一些实际问题无效.文章提出距离代价函数作为最佳聚类数的有效性
论文部分内容阅读
在空间聚类中,最佳聚类数k求解的聚类数k必须是事先给定的确定值,然而,实际中k很难被精确地确定,使得该算法对一些实际问题无效.文章提出距离代价函数作为最佳聚类数的有效性检验函数,建立了相应的数学模型,并据此设计了一种新的k值优化算法.同时,给出了k值最优解kop1及其上界kmax的条件,在理论上证明了经验规则kmax≤√n的合理性,实例结果进一步验证了新方法的有效性.
其他文献
针对基本遗传算法难以实际应用的困难,吸收加速遗传算法的思想,提出一种考虑隔代遗传、模仿自然界中“附势”行为的广义遗传算法,它能够保持优秀个体的多样性,利用祖辈中的优
ZnO thin films were deposited on n-Si (111) at various substrate temperatures by pulsed laser deposition (PLD).X-ray diffraction (XRD), photoluminescence (PL),
Magnetic field plays an important role in solar structure and activity. In principle, the determination of magnetic flux would provide the best general-purpose
The three-dimension gas-particle flow in a spiral cyclone is simulated numerically in this paper. The gas flow field was obtained by solving the three-dimension
The surface tension and specific heat of Ni-5%Sn alloy melt were measured by the oscillating drop method and the drop calorimetric method using electromagnetic
A novel 99mTc labeled complex, [N-[2-((2-oxo-2-(4-(3-phenylpropyl)piperazin-1-yl)ethyl) (2-mercaptoethyl)amino)acetyl]-2-aminoethanethiolato]Technetium(V) oxide
The effect of Al substitution for Fe on crystal structure, magnetostriction and spontaneous magnetostriction, anisotropy and spin reorientation of a series of p
GaAs nanocrystals were prepared via a simple mechanical ball milling technique. The prepared GaAs nanocrystals have high purity and could form colloidal ethanol
A new technology was developed to recover multiple valuable elements from the spent Al2O3-based catalyst by X-ray phase analysis and exploratory experiments. Th
The important notions and results of the integral invariants of Poincaré and lished first by E. Cartan in the classical mechanics are generalized to Hamilton m