weighed mean 中文意思是什麼
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In order to adapt the maintenance activities well, this paper makes some ameliorations, as follows : ( 1 ) it is considered not so pertinent in this paper to take road user cost into account of total cost, and an advice of using pavement serviceability performance for benefit is given. ( 2 ) when evaluating the average of the road network serviceability, this paper put forward to using weighed geometric mean to calculate pqi. ( 3 ) bringing in a new idea of checking the reasonability of classifying pavement state and typical measure by transfer probability
為盡可能使其反映實際的養護規律，本文在前人研究的基礎上，提出以下改進： （ 1 ）在建立費用模型時，認為在我國現階段，考慮用戶費用有不妥之處，提出以路面使用性能作為用戶費用的映象，以路面使用性能作為效益的評價指標； （ 2 ）在評價路網平均服務水平時，提出用加權幾何平均值來計算路面使用性能綜合評價指標pqi ； （ 3 ）提出了利用轉移概率檢查狀態的劃分和典型措施的合理性的新思想； （ 4 ）在求解markov決策模型時，通常使用的方法是線性規劃法，本文闡述了另外兩種求解的方法：策略迭代法和整數規劃法。 -
Firstly, the paper researches on the assessment of the expressway asphalt pavement performance, practice measure data of ten typical sections are selected from survey expressway, establishes weighed geometric mean to calculate pqi, which includes sri parameter that could enhance model precision
首先，對高速公路瀝青路面使用性能進行評價，從課題所調研的高速公路中，選取10個典型斷面的實測數據，建立基於加權幾何平均值的瀝青路面綜合評價模型pqi ，並在模型參數中增加抗滑性能指標sri ，提高評價模型精度。 -
The innovation of this paper is concentrate the merit of the above two recommendation technology, namely, it is a hybrid method that use the conception of customers ’ preference and weighed clv, and what is joited is to use the conception of threshold, so it can be settled on the joit of the two method and avoid the error of use the two recommendation seprately. in this hybrid method, we can firstly identify the loyalty of researched customer use clv, what is mean is firsly the wrfm technology is used to classify and secondly identify the customer is high loyalty or not, if he belongs to the
本文的創新點正是集中以上兩種推薦技術的優點，使用了基於客戶偏好的協同過濾和基於加權的客戶生命周期值兩種理論形成的混合推薦方法。這種方法在兩種技術的結合點上採用了「閥值」的概念，這樣就很好地解決了兩種方法的中間過渡並且有效避免了兩種推薦方法單獨使用時的偏差。
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