select by layer 中文意思是什麼
select by layer
解釋
用層選擇-
It is very important to estimate the basic parameters in helicopter preliminary design. neural network ( nn ) has the advantages in estimating accuracy and generalization over traditional methods. however, there are some difficulties in using nn, e. g., how to select a proper network structure and the number of hidden layers. in this paper, structure and connection weight of a three - layer nn are optimized by genetic algorithm, and the optimized network is applied to helicopter sizing. the proposed method can not only give an optimal nn structure and connection weight, but also reduce the prediction error and has the capability of self - learning when the latest data are available. furthermore, this method can be easily applied to helicopter design systems
在直升機初步設計階段估算其基本參數是很重要的.神經網路的通用性和精度比傳統的估算方法有更多的優勢，但是在應用神經網路時存在如何選擇合適的網路結構和隱層節點數目等一些困難.應用遺傳演算法優化三層神經網路結構和連接權重，並將優化得到的網路應用於直升機參數選擇中.該方法不但可以給出一個最優的神經網路結構和連接權重，而且降低了估算誤差，具有及時應用最新數據學習的能力.此外，該方法易於在直升機設計系統中得到應用 -
Abstract : it is very important to estimate the basic parameters in helicopter preliminary design. neural network ( nn ) has the advantages in estimating accuracy and generalization over traditional methods. however, there are some difficulties in using nn, e. g., how to select a proper network structure and the number of hidden layers. in this paper, structure and connection weight of a three - layer nn are optimized by genetic algorithm, and the optimized network is applied to helicopter sizing. the proposed method can not only give an optimal nn structure and connection weight, but also reduce the prediction error and has the capability of self - learning when the latest data are available. furthermore, this method can be easily applied to helicopter design systems
文摘:在直升機初步設計階段估算其基本參數是很重要的.神經網路的通用性和精度比傳統的估算方法有更多的優勢，但是在應用神經網路時存在如何選擇合適的網路結構和隱層節點數目等一些困難.應用遺傳演算法優化三層神經網路結構和連接權重，並將優化得到的網路應用於直升機參數選擇中.該方法不但可以給出一個最優的神經網路結構和連接權重，而且降低了估算誤差，具有及時應用最新數據學習的能力.此外，該方法易於在直升機設計系統中得到應用 -
Foundation structure design in soft soils is a very difficult engineering problem. the elastic foundation beam method has some merits such as easy calculation pattern and definite model and m - method is fit to practical situation, so it is used comprehensively and welcome by constructors, thus m - method is recommended by many codes. but it is difficult to select a m - value to some soils, and the codes provides a scope of m - values, and they are different in varied regions and soil conditions, thus it is optional to choose m - value of a soil layer for engineering designers. so it is necessary to calculate m - values by back - analysis method using measured datu of deep foundation pit
軟土地區的深基坑支護結構設計是一個十分復雜的工程問題，由於彈性地基梁法具有計算模式明確、計算過程簡單的優點，尤其是m法較符合軟土基坑工程的實際情況，因而受到廣大工程設計人員的歡迎，大多規范也推薦此法。但是m法計算參數的選取是工程界的一大難題，一般規范都給出了m值的大致范圍，而且每個地區的地質條件千差萬別，因而m的取值具有很大的隨意性，有必要根據一個地區的工程實測資料對m值進行反演分析，以便為地層相近或附近地區的基坑工程設計提供參考和依據。 -
In accordance with the principle of disintegrating the sole dealing system and admitting experienced and competent enterprises both at home and abroad into the exploitation of coal - bed methane while at the same time avoiding a situation of " multi - layer system against foreign enterprises ", the ministry of commerce and national development and reform commission jointly with relevant departments shall select, apart from china united coal - bed methane co., ltd, certain number of enterprises to carry out pilot exploitation of coal - bed methane in cooperation with foreign enterprises within regions designated by the state council
一、按照既打破獨家專營，吸引國內外有經驗、有實力的企業參與煤層氣開發，又避免「多頭對外」的原則，由商務部、發展改革委會同相關部門在中聯煤層氣有限責任公司之外再選擇若干家企業，在國務院批準的區域內與外國企業開展煤層氣合作開採的試點工作。
分享友人