無效多邊形 的英文怎麼說

中文拼音 [wúxiàoduōbiānxíng]
無效多邊形 英文
void polygon
  • 無 : 無Ⅰ動詞（沒有） not have; there is not; be without Ⅱ名詞1 （沒有） nothing; nil 2 （姓氏） a surn...
  • 效 : Ⅰ名詞（效果; 功用） effect; efficiency; result Ⅱ動詞1 （仿效） imitate; follow the example of 2 ...
  • 邊 : 邊Ⅰ名詞1 （幾何圖形上夾成角的直線或圍成多邊形的線段） side; section 2 （邊緣） edge; margin; oute...
  • 無效 : of no avail; to no avail; invalid; null and void; nullity （合同等的）; in vain; unavailability; ...
  1. The new line against polygon window clipping algorithm which makes full use of two judgement conditions to confirm noneffective intersections between the lines and the polygon edges can only calculate the effective intersections and increases the efficiency of the clipping. third, a new 3 - d clipping algorithm of line against spherical surface window is introduced for the first time

    一般多邊形窗口線裁剪的改進演算法充分利用確定被裁線段與多邊形邊無交的兩個判斷條件，對完全不可見線段以及與被裁線段無有效交點的多邊形邊進行了排除，只有當線段與多邊形邊有有效交點時才求交，避免了不必要的求交，提高了演算法效率。
  2. Grid hiding and break line cut are difficult point in displaying of 3 - d grid data, the thesis also presented a new visualizing algorithm applicable for 3 - d grid data of topography - sliced polygon filling. the experiment result shown, contrasting to floating level, this algorithm excels in both time complication and effect of grid hiding and break line cut

    三維網格顯示中的網格消隱與斷線處理一直是網格可視化技術中的難點，本文結合三維地形網格的特點，提出了一種新的網格可視化演算法? ?切片多邊形區域填充法，在實驗結果對比中，無論是演算法復雜度還是顯示效果上都明顯優于浮動水平面法。
  3. Following, making development study from the three directions : the first one is how to reduce calculation when to use markowitz model. this text has improved the efficient frontier of markowitz model utilizing free risk assets, and reduced calculation about revenue rates " co - variance matrix utilizing single or multiple factors, and so on. the second one is to add thinking factors about, such as transaction fee, fund limitation, lowest transaction unit ' s limitation, risk measures and exchange rate risk of international portfolio securities, so as to make markowitz model closer to our country ' s practice

    接著，分三今方向對markowitz模型進行了拓展研究：第一個方向是運用markowitz模型時如何減少計算量，本文利用無風險資產來改進markowitz模型的有效邊界，利用單因子或多因子模型來減少收益率協方差的計算量等等；第二個方向是增加考慮因素，諸如交易費用、資金限制、最小交易單位限制，風險測度和國際組合證券的匯率風險，使markowitz模型更貼近我國的實際；第三個方向是對markowitz模型進行動態拓展研究，提出了將證券收益率看成是隨機序列時的投資決策模型，深入研究了m ? v有效邊界隨資產品種數增加而發生的漂移，並用解析方法和幾何圖形描述了漂移的軌跡和方向。
  4. These problems primary show that the current urban planning of the urban fridge is nullification ; furthermore, it also makes us think about the essence of the urban planning, that is to say, as a public policy, the nullification of urban planning appears during the planning is executed

    諸多問題集中反映了城市邊緣區城市規劃的無效性，引發了我們對于城市規劃本質的思考，即城市規劃作為一種公共政策，其無效性集中體現在城市規劃的過程之中。由此，我們認為應從城市規劃政策形成和實施過程來探索問題的癥結所在。
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