查询词典 clustering

In this paper, based on the ideas of partitional and hierarchical clustering, an algorithm is proposed to determine the best number of clusters for categorical data, and the corresponding time complexity is analyzed as well.

结合划分和层次聚类的思想，提出一种符号数据聚类个数的确定算法。

So far, there are 5 kinds of clustering algorithm includes partitional algorithm, hierarchical algorithm, density-based algorithm, grid-based algorithm and model-based algorithm.

目前，聚类算法大体上分为划分的方法、层次的方法、基于密度的方法、基于网格的方法和基于模型的方法。

The new representation proposed in this paper deals with the partitional clustering problem by regarding it as a multi-objective optimal problem; in this approach the niche Pareto genetic algorithm is used to solve the problem.

动态聚类算法从本质上讲是单目标组合优化算法，一般需要事先给定目标分类数和初始聚类中心，且初始聚类中心的选择对数据划分结果影响较大。

The best theoretical solution to a partitional clustering problem is to find all possible partitions and choose the partition that minimizes the objective function. However, the enumeration of all possible partitions is impractical even for data sets of moderate size. Therefore, as an alternative, most partitional approaches use an iterative optimization technique. And this could be cause local minimum.

本文在分析了目前聚类的基本方法的基础上，指出以K平均法等为代表的分割聚类虽然理论上找到类的所有划分并使得目标函数最小就可以获得最优解，但由于对于相当尺度的数据集列举所有可能的划分并不现实，因而多数分割方法采用迭代优化技术作为变通。

Activation of lymphocytes and liver regeneration both involve perinuclear clustering of lysosmes.

淋巴细胞的激活以及肝脏的再生都与溶酶体在核周的集聚有关。

A distributed secure clustering protocol is proposed, in which the secure network initialization, random number broadcast from the base station and one-way hash chain are used to achieve the resiliency against possible attacks including node personating, cluster-head occupying, malicious cluster-member recruiting and multiple cluster-membership attacks.

针对成簇协议所面临的各种安全威胁，提出了一种分布式安全成簇协议，通过网络安全初始化、可信基站的随机数广播和单向密钥链技术来有效地抵御节点伪装和簇首占据攻击、簇成员恶意征募攻击和多重簇成员身份攻击。

the hip knee joint replaces the technique the deep phlebothrombosis, are cause the fibrin, the red blood cell under each kind of factor function as well as not the isometric blood platelet and the white blood cell in the vein the clustering process, after is the hip knee joint replaces the technique, most common complication.

髋膝关节置换术后的深静脉血栓形成，是在各种因素作用下导致纤维蛋白、红细胞以及不等量的血小板和白细胞在静脉内形成凝块的过程，是髋膝关节置换术后最常见的并发症。

The grey clustering ; Systematic botany ; Photinia

灰色聚类；植物分类学；石楠属

Combined with additional sequences of 20 bivalves and 6 gastropods downloaded from NCBI (National Center of Biological Institution), molecular phylogenetic trees were constructed using 4 Polyplacophora species as outgroup. The result resolved by maximum-parsimony, maximum-likelihood and Bayes-induce methods were in congruent with each other, which indicated that all bivalves formed a monophyletic group clustering with its sister-group, Gastropod.

结果显示：所有双壳纲的种类构成了单系发生的进化枝，与其姐妹群腹足纲聚在一起；双壳纲可以分为异齿亚纲和翼形亚纲两大类群，异齿亚纲是单系发生，翼形亚纲的系统发生关系则随方法的不同有所区别，牡蛎科的位置是造成此差异的主要因素。

Though a lot of effort has been devoted such as spatial guided clustering analysis and posteriors refinement with spatial constrained method,the weights of different feature space and complexity introduced by using other techniques are still waiting to be resolved.

尽管已经出现了许多改进的方法，如采用进行空间约束的聚类方法和使用其它保持空间紧致性的方法进行结果修正等，不过不同空间划分之间的协调、新的参数复杂性和算法复杂性反而使得聚类分析技术失去其简单有效的优势。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。