core tree 中文意思是什麼
core tree
解釋
中心植株-
This paper expounds the development and variation of the forestry science ， forest and forestry neally in past two cen turies the forestry science in itself goes through a transformation from traditional forestry science to modern forestry s cience. the modern forestry science, with the object of studying the establishment ， manageme nt and exploitation of the forestry ecosystem and the core of developing the eco logical environinent functi on of the forestry ecosystem ， is a subject that takes an overall play to the mul tiple benefits and function of forest. the cognition of forest also undergoes a variation from a single tree to trees g roup and still to forest ecosystem due to the deep alteration of the understand ing of forestry science and forest ， people begin changing their understanding of forestry from a central for m of timber utilizing which formed for a long time to a form that takes developi ng the ecological environment function of forestry ecosystem as its core and fo cal point ， and takes an overall play to the ecological ， economical and social function of forestry as its leadi ng thought and aim ， so as to realize the sustainable development of forestry
論述了林學、森林與林業近兩個多世紀以來的發展和變化.林學經歷了由傳統林學向現代林學的轉變.現代林學是以森林生態系統的營建、經營管理和利用為研究對象，以發揮森林生態系統的生態環境功能為核心，全面發揮森林的多種效益和多種功能為目的的學科.對森林的認識也經歷了由單株樹木到樹木群體到森林生態系統的變化.由於對林學及森林認識的深刻變化，人們對林業的認識也就從長期形成的以木材利用為中心，轉變到以發揮森林生態系統的生態環境作用為核心和重點，全面發揮森林的生態、經濟和社會功能作為林業的指導思想和目標，以實現林業的可持續發展 -
Isotope ; global change ; tree ring ; lake sediment ; ice core
同位素全球變化樹輪湖泊沉積物冰芯 -
The global change study is one of the most spectacular and interesting environment scientific questions in the 1990 s. the message of global change stores in tree rings, ice core, loess, underground water, lake sediment and deep sea sediment, all these proxies record the information of global change. with the advances in stable isotope techniques, the isotopic tracer records the message of climatic variation and becomes a powerful tool that can understand paleoenvironment reconstruction and modern environment changing
全球變化研究是90年代以來最為引人注目和關切的環境科學問題之一。全球環境變化的信息儲存於樹輪湖泊冰芯黃土地下水和海洋沉積物等載體中，隨著穩定同位素技術的發展，同位素示蹤劑指示環境變化的信息，成為了解古環境再造和現代環境信息變化的一個強有力的工具。 -
The paper gives a particular analysis on the core module of the option - adjusted model, that is the module of making interest scenes and the module of option characteristic behavior. combining the facts of our country the paper analyzes the applicability of the model. the paper simulates the process of calculating the effective duration and convexity with hull and white ’ s interest term structure and trinomial interest rate tree model
文章著重分析了期權調整利差的兩個核心模塊，即利率情景製造和期權特徵行為模塊以及其中涉及的模型在我國的適用性，並用hull和white的利率期限結構和三叉樹的方法模擬演算了一項具有隱含期權的假設資產的有效持續期和有效凸度的求解過程。 -
One is field fault diagnosis system, whose core arithmetic is back propagation neural network ; the other is remote fault diagnosis system, whose core arithmetic is fault tree. in this system, the database was used to save the fault knowledge and related information
現場診斷的核心是神經網路技術，通過對bp神經網路的分析，初步建立了檢測線的神經網路診斷系統，並以制動臺的故障監測與診斷為例，重點介紹了建立過程及診斷效果。 -
The core contents of digital power transmission network are to build the true three dimension scene of objective region, to search for the transmission equipments and to operate them in the scene interactively. according to the two main kinds of three dimension digital models ( earth surface model and transmission equipment model ), this thesis describes a simplifying method depended on view - point : it accomplishes displaying and flying over a large area of true earth surface with level of detail model based on block - binary tree. and it realizes " the efficient display of abundant data of equipment models and interactive management by the method of combination of models and images
構建目標區域的真實三維場景，並在場景中對輸電設備進行查詢和交互操作是數字輸電網路的核心內容，本文針對數字平臺中兩種主要的三維數據模型? ?地表模型及輸電設備模型提出了基於視點的簡化方法：用塊? ?二叉樹結構的動態細節層次模型解決了大區域真實地形的顯示及漫遊方法；用失柵結合的方式實現了對海量設備模型數據的高效顯示及交互管理的功能。 -
6. neighbor - joining algorithm is used for constructing a guide tree in clustal program. it is the core algorithm of some guide tree special softwares
Clustal程序的指導樹構建採用neighbor - joining鄰位相連演算法，該演算法同時也是很多指導樹生成專用軟體的核心演算法。 -
Scientific logic of the great decision - research on the concept of economic development in china of the tree generations of core of lead ship
黨的三代領導核心關于中國經濟發展構想的研究 -
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。 -
The core establishment planting was substantially completed in 1997 and the woodland is being managed for some more years. a total of some 300, 000 tree seedlings of more than 50 native species were planted between 1994 and 1997
從一九九四年到一九九七年期間，本署共種植了約有三十萬株屬於五十多種的本土樹苗。 -
In the ip core ’ s data management, we construct ip data - base tree structure, take the ip function as main search factor, warpping the ip cores having same function in the same xml file, and set up the accessing popedom, avoid the redundancy information, advance the search
在事務級ip核數據管理中，為了高效的搜索ip核，構建了事務級ip庫的樹型結構，以ip的功能為主要搜索要素，功能相同的ip核被封裝在同一個xml文件中，並設立訪問權限，避免冗餘信息，提高搜索效率，並且實現知識產權保護。 -
Data warehouse is a hot research area in 90s its main motif is to provide the decision - maker a powerful tool : gathering the data in pure consistent, relevant pattern, and making use of the data in managing analyzing, data - mining purposec that means that the decision - maker can use the tool to understand, grasp the situation of the business from different directions and forecast the future of it when using data warehouse, the processing speed determines data warehouse ' s practicability and processing ability the hoc ( highway decision center ) system realized before solves some key problems about intermediate scale data, mainly concentrating data warehouse performance coefficient when using hdc in large scale data, it encountered processing speed problem then the settlement of this problem becomes a major research point so, based on the former research achievements, the present task is to construct the renowned data warehouse architecture and its relevant algorithms, then adapts the system to the large scale dataset with data mining functions c this paper is a part of the research in order to construct the powerful system, a key problem is to cope with the processing - speed problem and the data space problem, etc, - caused by the large scale dataset and magnificent dataset this is also the core in the present data mining research this paper ' s motive is to design and realize a decision - tree classifier in the data warehouse system for large - scale dataset
大型數據倉庫的處理速度問題目前是制約其推廣應用的關鍵所在，也是這一領域的一個重要研究課題，也正是我們當前工作的重點：在前期研究工作的基礎上圍繞提高大型數據倉庫處理速度問題，建立改進的數據倉庫系統模型和相關演算法，開發出面向中級以上企事業單位的、具有數據挖掘和分析能力的大型數據倉庫系統。建立大型數據倉庫所面臨的關鍵問題，是如何妥善解決實際業務數據的大規模、海量特徵所帶來的處理速度和空間等問題，這也是當前挖掘技術研究必然面對的核心問題。本研究的目的是設計並實現大型數據倉庫系統中的分類數據挖掘工具? ?決策樹分類器，主要工作是在綜合了解現有決策樹分類演算法的研究情況的前提下，對決策樹演算法適應大規模數據集的問題進行探討，力求設計出能較好地適應大規模數據的分類器演算法。 -
The development of this system keys on the selection of evaluation target structure and the way of evaluation. the evaluation toolkit with the core of evaluate target tree is a proper solution
該系統的開發重點在於評價目標體系的選擇和評價模式的確定，以評價目標樹為核心的工具集的開發確保了評價系統的通用性、開放性和可維護性，是一種優選的設計方案。
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