vcm 中文意思是什麼

vcm 解釋
氯乙烯單體
  1. Vcm ann can take the relation between terms and document sorts more accurately than tf idf ig, though what it catc hs is misty information. in 1990s, the research of agent is flourishing, and the agent - oriented computing is regarded as another breakthrough of software development and a new innova

    進入90年代， agent的研究蓬勃興起，面向agent的計算被譽為「軟體開發的又一重大突破」 、 「軟體界的新革命」 ，有人預測， agent將是未來十年最重要的計算范型。
  2. There are two kinds of retrieval model, full text retrieval and content retrieval, and the vector space model ( vcm ) of the latter is a widely - used method with better effect. the best excellence of vcm is the predominance of knowledge presentation, which expresses documents with vectors in vector space and changes the comparability issue to the distance of vectors, and thus reduces the complexity of documents matching. however. we can not affirm the absolute effect of it, and in this thesis we prove its nonproficiency through experiments

    向量空間模型最大的優點在於知識表示方法上的巨大優勢，用n維空間的向量表示文檔，用向量之間的夾角表示文檔的相似度，從而將文檔信息的匹配問題轉化為向量空間中的矢量匹配問題，將難以計算的文字量化成很容易計算的實數，使問題的復雜性大大減小。但是，並不能夠說目前的向量空間模型是最理想的，本文通過實驗證明了vcm表達信息的不精確性。
  3. Entering the data of vcm concentration for 10 years and data of worker health status, and computing accumulated exposure dosage for each worker, and classifying the exposed workers into higher, middle and lower subgroups according to the dosage were carried out

    方法選取某廠238名職業接觸氯乙烯人群和212名非接觸人群，登錄該廠歷年氯乙烯濃度監測資料，以及工人健康監護資料，將暴露人群按累積接觸劑量分為未接觸組和低、中、高接觸組，比較接觸組間和接觸組與對照組間工人的癥狀和體征方面的差異。
  4. A two - dimensional model is proposed for simulation of gas phase cracking of 1, 2 - dichloroethane ( edc ) to produce vinyl chloride monomer ( vcm ) in tubular reactor furnace, in which side reaction of coke precursor formation is taken into consideration

    摘要建立了二氯乙烷在管式反應器中進行氣相熱裂解的二維模型，模型考慮了二氯乙烷熱解生成氯乙烯的主反應和生成焦前體的副反應以及氣體密度變化對裂解反應的影響。
  5. This park lies in the east of mashanzi town, the total area is 4 million m2, which is very adequate for big - pattern salt chemistry projects, such as soda, caustic soda, potassium ferric sulfate, magnesium, vcm / pvc and so on

    園區位於馬山子鎮東部，規劃面積6000畝，非常適宜上大型鹽化工項目，如大規模生產純堿、離子膜燒堿、硫酸鉀鎂肥，環氧氯丙烷、 vcm / pvc等項目。
  6. Vcm represents the common - mode voltage, which contains no useful information about the measurement and could in fact reduce the measurement accuracy

    象電池電壓監視的應用，共模電壓是測量系統所隱含的。
  7. Based on the work of other researchers, the paper introduces information theory into tf idf method of vcm, and forms a new tf idf 1g method which embodies information gain all through. the paper has proved by experimentation that the new method not only can keep the documents difference of traditional tf idf method, but also can catch the more minute discrimination in proportion of it than the old one

    本文在前人研究的基礎上，將信息增益引入到vcm權重計算方法tfidf的整個過程中，形成結合信息增益的tfidf相似度計算方法、標準確信度計算方法，得到最終的引入了信息增益的文本分類計算方法tfidfig 。
  8. We are specialized in sintered ndfeb, sintered smco, cast alnico, hard ferrite ceramic, bonded ndfeb, which are widely used in vcm, mri, motors, electronics, sensors, and loud speakers

    公司專業經營燒結釹鐵硼，並經營燒結衫鈷燒結鐵氧體粘結釹鐵硼粘結鐵氧體鑄造鋁鎳鈷系列產品，產品廣泛用於vcm mri電機電子產品傳感器計算機及外設無線通訊產品和揚聲器等領域。
  9. Exposure assessment and occupational health hazard in vcm - exposed workers

    氯乙烯作業工人職業接觸評定與健康危害調查
  10. Knowledge purification is the key procedure of knowledge acquisition, and machine learning is a effective method to gain wisdom for computers, among which artificial neural network with tutor coached can learn more accurate knowledge by faint structure, and then is a perfect way to deal with misty knowledge by describing and computing intangibly. lt is hard to describe or compute the misty relation of terms and document sort with accurate way. and we can figure out misty knowledge with misty way, so the paper introduces ann into vcm to form a conjoint method vcm ann

    。其中，有導師指導的人工神經網路能夠以模糊的結構學習較為精確的內容，是將模糊的知識進行模糊計算和模糊描述的理想方法。詞條項與文檔類別之間的模糊關系難以用精確的方法進行精確地描述與計算，模糊的知識用模糊的方法能得到較好的解決，因此本文將神經網路應用到信息檢索模型中，將之與向量空間模型相結合，形成了一種改進的向量空間模型vcmann 。
  11. Virtual channel memory sdram, vcm sdram

    虛擬通道內存
  12. This paper has researched the 3 ? dimensional modeling 、 data construction 、 real texture mapping and texture edit of urban landscape 、 data exchange with 3d studio and autocad, developed the 3 ? d city modeling and visualization system ( vcm & v ) as one of series products of digital automatic mapping system ( virtuozo ) by visual c + + 5. 0 for windows 95 / nt and opengl, integrated vcm & v with gis software mapinfo professional 4. 0, build urban 3 ? dimensional visualization gis, and realized 3 ? dimensional visualization of digital chart

    本文研究了城市景觀的三維建模、數據結構、真實紋理映射和紋理編輯、與三維設計軟體3dstudio和autocad的數據交換，以visualc + + 5 . 0forwindows95 / nt及圖形庫opengl開發了全數字化測圖軟體virtuozo的系列新產品? ?城市景觀三維可視化系統（ vcm & v ） ，將城市景觀三維可視化系統與gis軟體（ mapinfoprofessional4 . 0 ）進行了集成，建立了三維可視化gis ，實現了數字地形圖的三維可視化。
  13. Exposure estimation of vcm and its occupational health hazard

    氯乙烯職業接觸評估及其健康危害調查
  14. Vcm vacuum control moudulator nozzle

    真空控制電磁閥
  15. Vcm will cause health hazardous effects in the exposed workers even to the concentration lower than the health standard ( mac ) of china

    提示在我國的衛生標準范圍內，氯乙烯仍可能產生一定的健康危害。
  16. The model can satisfactorily predict commercial operation results with regard to the edc conversion, vcm selectivity, pressure and temperature at the outlet of reactor coil

    與工業數據比較后發現，爐管出口的轉化率、選擇性、出口壓力和溫度等數據與模型預測值一致，表明模型具有較高的可信度。
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