between tree distance 中文意思是什麼
between tree distance
解釋
株距-
Three amendments are made to neighbor - joining method : first, a more precise evolution model is used to calculate the distance between sequences ; second, sequences are used to generate multiple typological structures, and hence compensate the shortcoming of neighbor - joining method, which can generate only one typological structure ; third, back mechanism is introduces to avoid the negative branch length in distance method and get a more accurate tree
本文對距離法中的鄰接法進行了三點改進: 1 .使用更精確的進化模型來度量序列之間的距離，降低因模型而帶來的誤差; 2 .通過隊列產生多個拓撲結構，解決了鄰接法只能產生一個拓撲結構的缺陷; 3 .引入回退機制，消除了距離法中負枝長的產生，得到的樹更準確。 -
First, the question answering system calculates semantic similarity by using distance between words in semantic tree and the height of semantic tree, then this system uses semantic similarity between words and the weight of word to calculate semantic similarity between users ' questions and questions in answer database
首先，利用語義樹中詞語間的距離和語義樹的高度來計算詞語間的語義相似度，然後利用詞語間的語義相似度和詞語的權重進一步計算用戶問題與答案庫中問題間的語義相似度。 -
Based on the above works, the distance education resource warehouse is improved in this thesis by adding the storage and management of media material metadata and learning content hierarchy graph ; the learning model of distance education system is improved and introduced. the transformation algorithm between learning content hierarchy graph and and / or tree is given. finally, the researc
在以上理論研究成果的基礎上，對現有的遠程教育資源庫進行了改進，增加了媒體素材庫元數據和學習內容層次圖的存儲和管理；同時對遠程教育系統學習模型進行了改進，給出了改進后的遠程教育系統學習模型示意圖，並給出了學習內容層次圖和and / or樹之間的構造轉換的具體演算法。 -
The results showed : the relationships among cover of herbaceous layer, cover of liver moss layer, thickness of liver moss layer, thickness of root system twine layer and the distance between seedlings and adjacent tree were positive correlation ; the relation between litter and tile above five variables were negative correlation ; the variables of micro - habitat affecting seedling in the picea schrenkiana stand were generalized with moss, herbaceous, spatial distance, humus and litter ; litter and spatial distance between seedlings and adjacent tree were the most primary factors of micro habitat affecting regeneration of one year seedling
結果表明：天山雲杉林分中草本層蓋度、苔鮮層蓋度、苔鮮層厚度、根系盤結層厚度、幼苗距大樹的距離5個環境變量之間為正相關；枯落物與草本層蓋度、苔蘚層蓋度、苔蘚層厚度、根系盤結層厚度、幼苗距大樹的距離為負相關；天山雲杉林微生境綜合因子可概括為「苔蘚」 、 「草本」 、 「空間距離」 、 「腐殖質」和「枯落物」 ；影響一年生幼苗更新最主要的微環境綜合因子為「枯落物」和幼苗距大樹的「空間距離」 。 -
The basic idea for hierarchy - based method is that creating and maintaining a tree of clusters and sub - clusters according to some kind of criterion to measure the distance of clusters, the procedure will be sloped until some terminal conditions are satisfied. hierarchical clustering method can be further classified into agglomerative and divisive hierarchical clustering, depending on whether the hierarchical decomposition is formed in a bottom - up or top - down fashion. most hierarchical clustering methods can produce the better results when the clusters are compact or spherical in shape. but they do not perform well if the clusters are any shape or there are outliers. a main reason is that the most hierarchical clustering methods employ medoid - based measurement as distance between clusters
基於層次方法的聚類的基本思想足：根據給定的簇間距離度量準則，構造利維護一棵由簇利子簇形成的聚類樹，直至滿足某個終結條件為止。根據層次分解是自底向上還是自頂向下形成，層次聚類方法可以分為凝聚的（ agglomerative ）和分裂的（ divisive ） 。人多數層次聚類演算法在緊密簇或球形簇結構下能夠產生較好的聚類效果。 -
Validation study of forensic science was carried out using forensic samples such as hair, nail and badly degrade bone. the method has also been used in case work to validate the practicability. maga2 software was employed to analyze the genetic distance between samples and construct the phylogenentic tree
用毛發、指甲、微量血痕及各種陳舊骨骼樣本對所建立的方法進行法醫學有效性測試，並用實際案例驗證其實用性；應用所建立方法對漢族、黎族、維吾爾族、瑤族、藏族無關個體樣本共446份進行序列分析，調查不同民族mtdna多態性；應用mega2軟體對所得各民族數據做進化距離分析，並構建各民族內部和民族間的系統發育樹，探討各民族間的遺傳關系。 -
Conclusively, morphological similarity and distance in phylogenetic tree are far from the same thing, and no inevitable relationship exhibits between them
由此推斷，形態相似性與進化關系的遠近是兩口事，二者之間無必然的聯系。
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