scanning element中文什么意思

下載手機詞典可隨時隨地查詞查翻譯

In a scanning system ( optical character recognition , cathode ray tube ) , the movement of the scanning element from the end of one scanned line to the beginning of the next
在掃描系統(tǒng)（光學字符認別，陰極射線管）中，光點從一行的末端到下一行的始端的運動。
In the proposed join algorithms , although some algorithms such as mpmgin algorithm [ 23 ] , outperform standard rdbms join algorithms , they perform a lot of unnecessary computation and i / o for matching basic structural relationships , especially in the case of parent - child relationships ; other algorithms such as the stack - tree - desc algorithm [ 24 ] , represent the state - of - the - art in structural joins , however , they do not utilize indexed structures but sequentially scan the input lists . thus , i / o ' s can be wasted for scanning element that do not participate in the join , and join speed can be influenced
另外，在所提出的算法中，盡管有的算法，如mpmgjn算法[ 23 ]優(yōu)于標準的rdbms連接算法，但是該算法為匹配基本的結構關系，特別是在父子關系情況下，執(zhí)行了大量不必要的計算和占用了大量的i / o資源；有的算法雖然代表了結構連接算法的先進水平，如stack - tree - desc [ 24 ]連接算法，但是它沒有利用索引結構而是順序瀏覽輸入列表。

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