critical table 中文意思是什麼
critical table
解釋
判定表-
If the search is time - critical, a binary search or hash table lookup is almost always best, but as with sorting, you must keep locality in mind
如果搜索是時間關鍵的，二進制搜索或者哈希表查找幾乎總是最好的，但是與排序一樣，必須記住地址。 -
The results show that, when increasing the feed rate of the grinding wheel, decreasing the rotating speed of the wafer chuck table and using coarser grit grinding wheel, the material removal rate in the wafer rotating grinding increase, the feed rate of the grinding wheel has greater influence on the material removal rate ; when suitably increasing the rotating speed of the grinding wheel, decreasing the feed rate of the grinding wheel and using finer grit grinding wheel, the wafer surface roughness can be reduced ; there exists a critical rotating speed of the grinding wheel ( about 2300rpm ), beyond which the material removal rate evidently decreases and the spindle motor current and wafer surface roughness steeply increase ; when the grit size of the grinding wheel is finer than # 2000, the material removal rate decreases and the wafer surface roughness has no obvious improvement
研究結果表明，增大砂輪軸向進給速度和減小工件轉速，採用粗粒度砂輪有利於提高磨削矽片的材料去除率，砂輪軸向進給速度對材料去除率的影響最為顯著；適當增大砂輪轉速，減小砂輪軸向進給速度，採用細粒度砂輪可以減小磨削表面粗糙度；在其它條件一定的情況下，砂輪速度超過一定值會導致材料去除率減小，主軸電機電流急劇增大，表面粗糙度變差；採用比# 2000粒度更細的砂輪磨削時，材料去除率減小，矽片表面粗糙度沒有明顯改善。 -
Thirdly, according to the integrated design of asmes, we confirm the critical technologies of the system. they include three - tier architecture, middleware and the correlative technologies of database, such as the technology of nested table and the programming implementation of data exchange between the database and another one. then, we illustrate and analyze these technologies
第三部分，根據系統總體設計，確定面臨的關鍵技術，主要包括三層結構、空域管理與評估系統的設計和實現中間件技術和數據庫的相關技術，如異種數據庫的數據交換的編程實現和嵌套表技術，並對各項關鍵技術進行概述和分析。 -
This thesis discusses the research and development on some critical parts in airspace management and evaluation system, including mainly the following contents : design the architecture of airspace management and evaluation system. design and realize the event log middleware and event log module based on middleware technology. design and realize the core and nodus of airspace management and evaluation system - airspace data access based on object oriented technology and nested table technology
本文對空域管理與評估系統的一些關鍵問題進行了研究和開發，主要包括以下幾個方面的內容：設計空域管理與評估系統的體系結構提出並實現了基於中間件技術的日誌中間件及日誌維護模塊採用面向對象技術和嵌套表技術設計和實現了空域管理與評估系統中的核心和難點? ?空域數據訪問 -
The result can be shown in three ways : grid, report table, graphic. with these functions, workers can master the railway status very well to manage the maintenance directed against the problem. finally, on the basis of using the experience of other countries and department for reference, the thesis brings forward some critical technologies needed in system including : forecast model
最後，在借鑒國內外線路維修經驗和其他部門維修工作的基礎上，就系統開發和完善過程中所需要的一些核心技術進行了初步探討，如：線路不平順預測模型、養護?費用模型、維修決策模型等。 -
Taking the typical cities in subsidence zone in yangtze river delta as an example, the concrete identification method of disaster causal critical water table of land subsidence is brought forward according to the monitoring data of land subsidence and the critical water table is identified
以長江三角洲地面沉降區代表城市為例，給出了根據已發生地面沉降災害城市的地面沉降監測數據確定地面沉降成災臨界水位的具體方法，並確定了該地區地面沉降成災臨界水位。 -
Key management is critical technic of realizing database encryption. in this dissertation, after analysing and comparing several popular key managemet scheme. we make improvement of two - phase key management scheme according to the matter of fact, and achieve two - phase key management scheme from user key to user class key and to data class key, through creating system table in database. at the same time, we work out key using sequence of chaotic nonlinear system. chaotic sequence is complex and recalcitrant to analysis and unpredictableness, and it can offer good complexity and comparable randomness. experiment result proves that using chaotic sequence can create good key
本文首先分析比較了幾種常用的密鑰管理方案，然後針對應用的實際情況，對兩級密鑰管理方案進行了改進，通過在數據庫中建立系統表實現了由用戶密鑰得到用戶類密鑰、以及由用戶類密鑰得到數據類密鑰的兩級密鑰管理。同時，本文利用由混沌非線性系統迭代產生的序列來生成密鑰。混沌序列結構復雜，難以分析和預測，能提供很好的復雜性、類隨機性。
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