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BiRch：一种处理k步可达性查询的双向搜索算法
k步可达性查询 双向搜索 广度层数 拓扑层数
2015/12/22
针对现有方法低效或索引规模庞大的问题,提出一种双向搜索算法Bi Rch。当判断顶点u是否满足k步可达顶点v时,首先比较u的出度和v的入度,优先处理度小的顶点。其优点体现在使用较小的索引,同时避免由于u的出度过大所带来的效率下降问题;提出基于双向广度层数和双向拓扑层数的剪枝策略来辅助过滤,减少需要访问的顶点数量。基于19个真实数据集进行测试,实验结果从索引构建时间、索引大小、查询响应时间、处理顶点数...
基于BIRCH的木材缺陷识别
分层的平衡迭代归约及聚类 聚类分析 木材缺陷
2013/12/12
提出了一种新的基于分层的平衡迭代归约及聚类(balance iterative reducing and clustering using hierarchies,BIRCH)算法的木材缺陷识别方法,讨论了关于分支因子(B,L)、阈值T的选取及非缺陷类判别问题。该方法通过在一定阈值内构建CF树,产生初始聚类,对初始聚类进行非缺陷类判别,自动识别木材缺陷类及位置并标记。实验结果表明,该算法能有效地进...
EFFECT OF BIRCH KRAFT PULP PRIMARY FINES ON BLEACHING AND SHEET PROPERTIES
EFFECT BIRCH KRAFT PULP BLEACHING SHEET PROPERTIES
2010/10/25
By removing the primary fines from an oxygen-delignified mill birch pulp, a fiber fraction was obtained having low metals content and no extractives. After DEDeD bleaching the fiber fraction had somew...
BIRCH混合属性数据聚类方法
聚类 BIRCH算法 混合属性
2009/11/19
数据聚类是数据挖掘中的重要研究内容。现实世界中的数据往往同时具有连续属性和离散属性，但现有大多数算法局限于仅处理其中一种属性，而对另一种采取简单舍弃的办法丢失聚类信息和降低聚类质量。一些能处理混合属性的算法又往往处理的属性过多，导致计算量的大增。提出了一种基于BIRCH算法的混合属性数据的聚类算法；在UCI数据集上的实验表明，文中提出的算法具有较好的性能。
VAPOUR PHASE CRACKING OF TAR FROM PYROLYSIS OF BIRCH WOOD
wood pyrolysis tar cracking secondary reaction
2009/10/13
The vapour phase cracking of tar from pyrolysis of birch wood (particles, 0.5-1.0 mm) was studied in a thermogravimetric analyser (TGA) and in a coupling of the TGA with a consecutive tubular reactor....
基于XML的可继承BIRCH研究
BIRCH算法 XML语言 可继承性
2009/8/10
针对BIRCH算法过分依赖内存且无法高效处理新增数据的问题，提出一种BIRCH算法的可继承性处理模型。该模型利用XML技术存储聚类特征树，并通过解析XML文档来还原聚类特征树，增强了BIRCH算法的灵活性，解决了BIRCH算法中处理新增数据的效率问题。实验结果表明，该模型是有效的。
食品HACCP分类的BIRCH算法
聚类特征树 多代表点 多阈值
2009/8/7
食品卫生的HACCP自动分类要处理的数据集形状呈现多样性，对分类结果的准确性和专业性要求很高，已有的算法难以满足。该文基于经典BIRCH算法，结合多阈值思想和多代表点特征树思想，提出多阈值多代表点的BIRCH算法，增加了专业分类知识的指导，并对每一个代表点设立单独的阈值，使得该算法能适应各种形状的数据集，减少了聚类特征树重建次数，提高了算法的效率。
Properties of Composites of Unbeaten Birch and Pine Sulphate Pulps with Bacterial Cellulose
sulphate pulps bacterial cellulose composites breaking length
2009/6/16
The possibility of modifying the structure and properties of fibrous papermaking pulps with
bacterial cellulose was investigated. For this purpose, three ways of obtaining specific
composites were d...
Extended Oxygen Delignification of Birch Kraft Pulp
birch kraft pulp oxygen delignification peracetic acid pulp properties
2009/2/13
We studied the effect of the conditions of the oxygen delignification of birch kraft pulp with kappa number 18 on pulp properties. The investigation refers in particular to the effect of the amount of...
Effect of Birch and Pine Fibre Content and Degree of Beating on the Properties of Bleached Sulphate Pulps
bleached sulphate pulps beating, apparent specific volume (bulk) breaking length
2009/2/8
Apparent specific volume changes of bleached birch and pine sulphate pulps, as well as their mixtures in correlation with their basic strength properties (i.e. breaking length and tear index in the be...
Paper Birch and Fireweed Stand Establishment Decision Aids
Paper Birch Fireweed Decision Aids
2009/1/23
The Coastal Western Hemlock submaritime biogeoclimatic subzones (cwhds1 and ds2) occur in the inland valleys of coastal British Columbia, where the climate is commonly transitional between the provinc...