back n. 1.背,背部;背脊;背面,反面;背后,后部,后面,里面。 2.(指)甲;(刀)背;(手)背;(書)背;(椅子)靠背;(山)脊;(船的)龍骨;襯墊,底座。 3.體力;力氣。 4.【摔跤】仰面倒下。 5.【戲劇】(舞臺的)背景。 6.足球后衛(wèi)。 7.【語言學(xué)】舌根音[軟口蓋音]。 8.(pl. -s) 〔美國〕假鈔票。 at the back of a house 房屋背后。 The back of the mouth 口腔深處。 Full back (足球的)后衛(wèi)。 Half back 中衛(wèi)。 Lazy back 椅子的靠背。 At sb.'s back 做某人的靠山。 At the back of 在…之后,在…背后 (at the back of one's mind 在心里,內(nèi)心上;下意識)。 Back and belly 背與腹;衣食;腹背(都)。 Back and edge 盡力,拼命。 Back to back (with) 背對背。 Behind sb.'s back 在某人背后;背地里,暗中。 Break one's back 折斷脊背骨;負(fù)擔(dān)過重,承受不住。 Break the back of 1. 毀壞;傷其要害。 2. 克服某事最艱巨的部分;度過最困難的時刻。 Cast sth. Behind one's back 把某事置之腦后。 Get off sb.'s back 停止對某人攻擊[責(zé)難]。 Get one's back up 發(fā)怒。 Get [put, set] sb.'s back up 〔口語〕觸怒某人,惹惱〔由貓怒弓背而來〕。 Get the back of 繞至…的背后。 Give [make] a back (游戲)彎背作馬狀供人跳過。 Give the back to (轉(zhuǎn)過身子)背向著,遺棄。 Have [with] one's back to the wall 陷入絕境。 Have sb. At one's back 以某人作靠山。 In back of 〔美口〕在…之后,在…的背面。 On one's back 仰向,朝天 (lie on one's back 仰臥。 Fall on one's back 仰面倒下;背,馱;逼近背后)。 On [upon] the back of 由…背后,緊靠…的后面,繼續(xù);此外,加之。 One's back is up (像貓發(fā)怒一樣)聳著背 (His back was up. 他發(fā)怒了)。 Put one's back into (sth.) 努力干(某事)。 See the back of 趕走,攆走;擺脫某人。 Set one's back against the wall 以寡敵眾,負(fù)隅頑抗。 Show the back to 逃出,逃離。 Slap sb. On the back 拍拍(某人)脊背〔表示贊成、鼓勵〕。 The Backs 〔英口〕 (Cambridge 大學(xué)的)校后校園。 The back of beyond 偏僻之地,遙遠(yuǎn)的地方。 To the back 到骨髓,完全。 Turn the back 逃亡,敗走。 Turn the [one's] back on 不理睬;丟棄;逃出。 adj. 1.后部的,背部的;后面的 (opp. Front) 內(nèi)地的,偏僻的;〔美國〕邊遠(yuǎn)的,邊陲的。 2.(貨物等)回程的;向后動的,逆的。 3.(思想)落后的。 4.〔美國〕未繳的,拖欠下的,未付的。 5.(雜志等)過了期的。 6.【語言學(xué)】舌根的。 a back street 〔美國〕背街。 A back door 后門。 Back teeth 大牙,槽牙。 A back settler 邊疆居民,邊疆移住民。 Back cargo 歸程(載運(yùn)的)貨物。 A back current 逆流。 A back salary [rent] 欠薪[租]。 Give a back answer 回嘴;頂撞。 Take a back seat 坐末位,坐下席;謙下。 Take the back track 〔美國〕回去,退去。 adv. 1.向后,退,在后面,向背面,倒,回頭,返,歸,復(fù);離開;隱匿。 2.壓制著,勒,扣,阻礙。 3.以前,過去;從前。 answer back回嘴。 Pay back付還。 Send back送回。 What is the fare to London and back? 去倫敦來回要多少錢? A few pages back 兩三頁前。 For some time back 前些時以來。 Two years back 二年前。 vt. 【計算機(jī)】備份,把(文件等)備份(up)。 To back up tiles is tedious work.把文檔備份是一項枯燥無味的工作。 ?B-! 回去! Back and forth 〔美國〕 1. 來來去去。 2. 翻來覆去。 Back of 〔美口〕在…的后部,在…的背后。 Be back 〔口語〕回家;回來 (I'll be back in a minute. 馬上就回來)。 Come back = go back 回,歸。 Go back from [(up) on] 拋棄,辜負(fù);出賣(朋友) (He went back on his friends. 他背叛了朋友)。 Go back from one's word 違約,食言。 Keep back ! 不要過來!不要前進(jìn)! Keep back (sth.) 阻止向前;忍??;勒?。豢巯?;隱匿[瞞] (keep back the truth 隱瞞真相)。 Look back 回顧。 Talk back 回嘴,還嘴;反復(fù)重說。 There and back = to and back 往返;來回。 vt. 1.裱(畫);給…裝背襯;裝上(椅)背;作(風(fēng)景等)的背景。 2.給…做后援,支持,資助;慫恿;下睹注于。 3.背書(支票等),落名(信后等)。 4.使后退,使折回。 5.乘,騎(馬);〔口語〕背,馱。 6.〔美國〕位于…的背后。 back an automobile 倒車,退車。 Back a picture 裱畫。 Back a check 背書支票,在支票背面簽字。 vi. 退后,倒退,逆行;(風(fēng)向)反(時針)轉(zhuǎn)。 Back a sail 【航海】轉(zhuǎn)帆使船緩進(jìn)。 Back and fill 【航?!?風(fēng)向紊亂時)看風(fēng)使舵因勢前進(jìn);〔美國〕逡巡,躊躇。 Back down 放棄權(quán)利等,撒手;打退堂鼓,取消前言。 Back off 退避;后退。 Back on to 〔美國〕背靠著。 Back out (of) 縮手(放棄某事),取消;扭松,旋出;逃避(責(zé)任等)。 Back the wrong horse 〔美口〕估計錯;選錯。 Back up 支持,為…撐腰;堵塞,攔(水);【棒球】搶救后方;【計算機(jī)】把(文件等備份)。
Application of improved back - propagation network in the evaluation of railway rock slope 網(wǎng)絡(luò)在巖質(zhì)邊坡穩(wěn)定性評判中的應(yīng)用
A particularly interesting item is the back - propagation network , a c package that illustrates a net that analyzes sunspot data 特別有趣,它是一個c程序包,說明了一個分析日斑數(shù)據(jù)的網(wǎng)絡(luò)。
Algorithms for defect classification are developed . classifiers are constructed based on back - propagation network . the network configuration bases on input and output 2 .研究和開發(fā)了系統(tǒng)的缺陷分類方法,用bp神經(jīng)網(wǎng)絡(luò)構(gòu)建了系統(tǒng)的分類器。
The design theory of neural networks is discussed , including the basis principles of neuron control and the design of back - propagation network . 4 探討了面向控制的神經(jīng)元網(wǎng)絡(luò)設(shè)計理論,包括單神經(jīng)元控制的結(jié)構(gòu)和基本理論及bp神經(jīng)網(wǎng)絡(luò)設(shè)計; 4
The back - propagation network is the core part of ahead - propagation network in artificial neural network and is widely applied in many aspects such as function approach , mode distinguishing and data condensation Bp網(wǎng)絡(luò)是人工神經(jīng)網(wǎng)絡(luò)中前向網(wǎng)絡(luò)的核心內(nèi)容,它在函數(shù)逼近、模式識別、數(shù)據(jù)壓縮等方面使用非常廣泛。
Thickness is an effective feature for identifying corn from monocotyledonous weed , and the correctness was 90 % . ( 6 ) six shape features were used to design back - propagation network for weed identification and the network structure was 6 - 12 - 3 ( 6 )設(shè)計了用于雜草形狀識別的bp網(wǎng)絡(luò),結(jié)構(gòu)為6 - 12 - 3 ,并對學(xué)習(xí)誤差、隱層結(jié)點數(shù)對網(wǎng)絡(luò)性能的影響進(jìn)行了研究。
Besides stability , bifurcation and chaos in neural networks have receiving much attention recently . in this dissertation , we propose two neuron models with chaotic dynamics , which constitute chaotic neural networks that encompassed various associative and back - propagation networks 除了穩(wěn)定性之外,極限環(huán)以及混沌也是神經(jīng)網(wǎng)絡(luò)動態(tài)行為研究的重點,本文構(gòu)造了具有混沌解的兩種神經(jīng)元模型,通過混沌神經(jīng)元的耦合可以構(gòu)成混沌神經(jīng)網(wǎng)絡(luò)。
( 2 ) combining secondary genetic algorithm with back - propagation network , the thesis redacts genetic neural network procedure , which optimizes number of hidden node and weight value and threshold value simultaneously . the procedure overcomes blindness during search , avoids falling into localminimum and increases learning accuracy ( 2 )編寫了遺傳神經(jīng)網(wǎng)絡(luò)ga - bp程序,采用二級遺傳算法與bp算法相結(jié)合,同時優(yōu)化網(wǎng)絡(luò)隱層節(jié)點數(shù)和權(quán)值、閾值,既克服了尋優(yōu)過程的盲目性,又避免陷入局部極小,提高了網(wǎng)絡(luò)的學(xué)習(xí)精度。
Because wavelet transform has forceful ability to pick - up character and artificial neural network has a strong capability to classify information . in this paper , the wavelet network has been formed by the wavelet transform , which is multi - dimension wavelet , and the artificial neural network which is back - propagation network . taking the eigenvector as an input of the wavelet network , the wavelet network can fulfill diagnosis of faults 根據(jù)小波變鵬胞強(qiáng)的特征提取能力和人工神經(jīng)網(wǎng)絡(luò)經(jīng)訓(xùn)練后具有較強(qiáng)的分類能力的特點,本文把多維小波與目前應(yīng)用廣泛的bp ( backpid剛on )相結(jié)合釀成小波神經(jīng)網(wǎng)絡(luò),并以表征故障的特征向量作為小波神經(jīng)網(wǎng)絡(luò)的輸入。
This thesis expounds fundamental principle and realization technique of artificial neural network and genetic algorithm , and redacts artificial neural network procedures . - ( l ) adopting batch processing high - speed algorithm , the thesis redacts back - propagation network procedure to enchance training velocity , in which learning rate and momentum parameters are modulated self - adaptably during error correction 本文闡述了人工神經(jīng)網(wǎng)絡(luò)和遺傳算法的基本原理及實現(xiàn)技術(shù),并在此基礎(chǔ)上利用matlab5 . 3編寫了人工神經(jīng)網(wǎng)絡(luò)程序: ( 1 )編寫了bp人工神經(jīng)網(wǎng)絡(luò)程序,采用vogl “批處理”快速算法,學(xué)習(xí)速率、動量參數(shù)在誤差修正過程中自適應(yīng)調(diào)節(jié),提高了訓(xùn)練的速度。