tree index 中文意思是什麼
tree index
解釋
飾她-
According to the assessment & acceptance management characteristics and demands of s & t project in china, this paper discusses and builds the index system of s & t project assessment & acceptance, depicts the stage assessment & acceptance methods, and then constructs the decision model based on c4. 5 decision tree method
根據我國目前科技項目驗收評估管理的特點和要求，討論並建立了科技項目驗收評估的指標體系，闡述了分階段的科技項目驗收評估方法，建立了基於c4 . 5決策樹科技項目驗收評估決策模型。 -
The species richness and diversity index order of coniferous and broad - leaf forest and evergreen broad - leaf forest in different geology plots was as follows : shrub layer > herb layer > tree layer ; in shrub plots, the order was herb layer > shrub layer. in general jsw, jsi and ea index order was herb layer > shrub layer > ree layer. that indicated that the species of tree and shrub in karst area distributing is not even, and the species, which are dominant and adapt to the karst environment are cleaer
不同地區樣地針闊混交林和常綠闊葉林物種豐富度指數、多樣性指數均表現為灌木層草本層喬木層，而在灌叢樣地，物種豐富度和多樣性指數表現為草本層灌木層；整體上，石灰巖地區樣地jsw 、 jsi和ea指數為草本層灌木層喬木層；砂頁巖地區樣地為灌木層草本層喬木層。 -
Searching in high - dimensional spaces : index structures for improving the performance of multimedia databases. acm computing surveys, 2001, 33 : 322 - 373. 2 guttman a. r - tree : a dynamic index structure for spatial searching
本文試圖將高維空間中的每個點對應的兩種距離尺度通過線性組合的方式表達成復合距離尺度，從而能夠較好地縮小查詢空間，提高查詢效率。 -
Dbpropval it btree - the index is a b - tree. dbpropval it hash - the index is a hash file using, for example, linear or extensible hashing
Dbpropval _ it _ hash -該索引是使用例如線性或可擴展哈希演算法的哈希文件。 -
The research result is following : the annual species richness index of studied forest plant community averaged 64. 688, the species diversity index was 2. 982. the proportion of every functional group of forest plant community is : herbaceous layer ( average is 68. 89 % ) > tall tree layer ( average is 15. 266 % ) > shrub layer. ( average is 15. 845 % ) the proportion of every functional group in forest insect communities is remarkably different, and the order of the proportion is herbivorous insect group ( average 0. 729 ) > predatory natural enemy insect group ( average 0. 136 ) > parasitical insect group ( average 0. 135 ). with seasonal change, the proportion of herbivorous and predatory insect group decreased obviously, while that of parasitical insect group increased on average by 147 %
研究結果如下：森林植物群落種的全年物種豐富度指數平均為64 . 688種，多樣性指數為2 . 982森林植物群落內各功能類群物種所佔比重依次為：草本層（平均為68 . 89 ） >喬木層（平均為15 . 266 ）灌木層（平均為15 . 845 ） 。森林昆蟲群落中，全年各功能類群所佔比重以植食性昆蟲類群為最大，平均佔0 . 729 ；捕食性昆蟲類群次之，平均佔0 . 136 ；寄生性天敵類群為最小，平均為0 . 135 。 -
After analysis of tm / etm + data ' s advantage over the forest change detection, tasseled cap transformation, principal component analysis and normalized difference vegetation index were chosen to enhance the vegetation spectral information. expert classification system was adopted to extract the main tree species in the littoral shelter forest
在分析etm +數據在森林資源監測中的優勢的基礎上，通過纓帽變換、主成分分析和植被指數法增強植被光譜信息，結合專家分類系統對沿海防護林主要樹種進行提取。 -
Based on the five types of the construction systems of the yellow river that are portioned according to the distribution region, position and function of the protection forest in ningxia autonomous region, the distribution of the system, the arrangement of tree species, the growth status and protection structure index are analyzed
摘要該文在將寧夏段黃河護岸林防護林體系劃分為5種類型的基礎上，分析了該地區防護林的體系分佈、樹種配置、生長狀況及防護結構指標。 -
Analysis on the species richness and diversity index, community evenness in different plots and layers of evergreen broad - leaved forest in shiyang forest center in wencheng, zhejiang province resulted that species richness and diversity index, community evenness of the second sublayer of tree layer was much greater than that of the first sublayer in the vertical structure of the community
對文成縣石?林場常綠闊葉林的不同樣地、不同層次的物種豐富度、物種多樣性指數和群落均勻度進行了分析，結果表明:在群落垂直結構中，喬木層第2亞層的物種豐富度、物種多樣性指數、群落均勻度顯著大於第1亞層。 -
In the first place, the paper briefly discusses issues related to the main index mechanisms in spatial and temporal, studies the access methods of spatio - temporal databases which has been presented. furthermore, the paper explains the storage mechanisms in stadbs ( spatio - temporal analysis database system ) and presents a hr - tree index structure based on main memory to realize the index mechanism of stadbs, it ' s main technologies were discussed in detail. lastly, a visual demo of hr - tree based on main memory was introduced in this paper
本文在分析討論了主要的空間和時間索引技術的基礎上，研究、分析了時空數據的存取方法，對已提出的時空索引技術進行了分類、比較；根據時空分析數據庫stadbs存儲機制的特點，採用基於主存的hr -樹作為stadbs時空數據的索引結構，設計與實現了stadbs的時空存取方法，論文對stadbs時空索引機制的設計與實現作了較詳細的介紹，同時闡述了基於主存的hr -樹可視化演示程序的主要實現方法。 -
Nonclustered indexes have a b - tree index structure similar to the one in clustered indexes
非聚集索引與聚集索引有一個相似的b樹索引結構。 -
The second part includes the index of child suffix tree, and some other information for finding the location of every child suffix tree in disk quickly
第二部分是索引部分，包括子后綴樹的索引和其他信息。利用這部分信息，可以快速定位每棵子后綴樹在磁盤中的位置。 -
In a word, the landscape heterogeneity exist in different scales and so the green space has a landscape pattern which is much favor to the stability of ecosystem. 4 ) : its green patch ' s figuration index and fractal index are correlating with its tree diversity index and the shape design of different styles patches in this park is adapted to the planning of its trees diversity. 5 ) : its gr een patch ' s figuration index and fractal index are not correlating with its plant community dissimilarity index and so the design of the landscape heterogeneity in the interal patch is not suitable for its pattern
花港觀魚公園綠地景觀格局參數中斑塊形狀系數與分維數都與各斑塊樹種多樣性指數表現出相關性，滿足了生態系統空間相關性的要求。花港觀魚不同類型綠地斑塊形狀與樹種多樣性配合設計是成功的。花港觀魚綠地不同類型斑塊內部群落相異性指數與其對應的斑塊格局參數沒有呈現相關性，這個綠地生態系統的植物群落差異性屬性不具有空間相關性，花港觀魚綠地斑塊內部異質性設計與其景觀格局不匹配。 -
The species diversity index of the tree layer was a bit low, and the general trend was shrub layer > treelayer > herb layer
喬木層物種多樣性指數偏低，垂直結構各層次間物種多樣性大小依次為灌木層>喬木層>草本層。 -
It is a feasible way to manager spatial objects by utilizing relational database in the gis applications. we have brought to octa - tree index structure for managering spatial data efficiently in relational schema. by space filling curve, z - curve, we mapped rsdd to 1 - dimensional linear sp
為了在關系模式下有效地對空間數據進行處理，論文提出了八分樹的索引結構，並利用空間填充z一曲線把rsdd空間映射到一維空間，從而建立起了空間對象的索引順序。 -
Hbt lock on a heap or b - tree index
Hbt =堆或b樹索引的鎖。 -
The clustered index is implemented as a b - tree index structure that supports fast retrieval of the rows, based on their clustered index key values
聚集索引按b樹索引結構實現， b樹索引結構支持基於聚集索引鍵值對行進行快速檢索。 -
These algorithms lead to optimal join performance : nodes that do not participate in the join can be judged beforehand and then skipped using b - tree index. besides, each element list joined is scanned sequentially once at most. furthermore, output of join results is sorted in document order
其次，提出了兩個高效的兄弟關系的結構連接演算法，這兩個演算法具有較好的連接性能：不參與連接的結點可以事先判斷出來並利用b樹跳過，連接的兩個列表最多都只需掃描一次，而且連結結果按照文檔序有序。 -
In addition, we summarize some spatial join algorithms based on r - tree index and their cost estimation models. we also give out a query optimization algorithm framework based on dynamic programming algorithm, and integrated basic r - tree index method and query optimization mechanism into sadbs ii
另外，本文還總結了幾種基於r樹索引的空間連接演算法及其代價評估模型，利用動態編程演算法給出了查詢優化的演算法框架，並在sadbs中集成了基本的r樹索引方法和查詢優化機制。 -
It also can cooperate with acars system to provide data for oil consume analyse and technique evaluate, etc. this article discuss the working principle and realization of airplane flight safety real time monitor system, the core technology of real time database ( tplus tree index ) in detail, etc. while decoding module is one of the key modules, this article also introduces a high efficiency and easy extending qar data decoding arithmetic, the design and apply to background database, and the relative data load method in this module
本文對飛機飛行安全狀態實時監控系統的工作原理、實時數據庫的關鍵技術（ tplus樹索引）和飛機飛行實時監控系統的實現等，進行了詳細的探討。由於譯碼模塊是該系統的核心模塊之一，同時本文也介紹了一種高效的可擴展的qar數據譯碼平臺的設計和實現，以及后臺數據庫的設計和應用。同時本文也介紹了高效的數據導入的方法以及數據庫的性能優化。 -
In the case of data index, the paper generalizes several advanced data index at the present time and analyzes the feature of data index based on database emphatically. then it illustrates the spatial ordering quad - tree index based on database of gde. in the case of geographic data management, the paper studies and tests several primary technologies, such as data concurrent access, data storage, data query, data update and maintenance, data transmission and data buffer, and so on
數據模型方面，在對常見的數據模型進行描述和分析的基礎上，提出了滿足海量數據高效存儲和管理的gde數據模型，通過實驗對數據的存放方式和效率進行了測試；數據索引方面，歸納總結了當前提出的較為先進的幾種數據索引方法，尤其是著重分析了基於數據庫的數據索引的特點，並對gde基於數據庫的可排序四叉樹索引進行了重點闡述；地理數據管理方面，對數據並發訪問、數據查詢、數據更新與維護、數據傳輸以及數據緩存等關鍵技術進行了闡述和實踐；地理數據訪問對象方面，介紹了採用面向對象技術設計實現的地理數據訪問類。
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