Deterministic models rather than stochastic statistical models has been little pursued in exploration geochemistry . 在勘查地球化學(xué)中,幾乎沒(méi)有采用確定性模型,而是采用推測(cè)性模型。
As for mathematical modeling , the deterministic models were adopted to fit and predict the breakthrough curves of cadmium in soils 在數(shù)學(xué)模擬方面,采用了確定性模型對(duì)鎘在土壤中的穿透曲線進(jìn)行了擬合和模擬。
In a deterministic model , the critical path is usually defined as those activities with float less than or equal to a specified value , often zero 在確定性模型中,關(guān)鍵路徑通常定義為浮點(diǎn)值小于或等于指定值(通常為零)的活動(dòng)。
Numerical analysis and comparisons are accomplished for the schemes obtained from the deterministic model and the fuzzy model under the “ hard ” constraints and the “ soft ” constraints of voltage level 在電壓水平“硬”和“軟”兩種約束條件下,對(duì)確定性模型和模糊優(yōu)化模型所得的優(yōu)化方案進(jìn)行了數(shù)值分析和比較。
After that , the crisp equivalences are also discussed for different models when fuzzy variables are characterized by triangular fuzzy numbers , and the procedure is given to solve the deterministic models based on the genetic algorithm 當(dāng)模糊變量是三角模糊數(shù)時(shí),討論了模糊規(guī)劃模型的清晰等價(jià)形式,并采用遺傳算法給出了求解模型的具體步驟。
In this article some basic problems in the ccos are studied on the aspheric optical compound machine tool ( aocmt ) . the main contents and innovations include : [ 1 ] . the deterministic model is built for grinding and polishing processes 本文以光學(xué)非球面復(fù)合加工機(jī)床( asphericopticalcompoundmachiningtool , aocmt )為對(duì)象,對(duì)計(jì)算機(jī)控制光學(xué)表面成形技術(shù)中的一些基本問(wèn)題進(jìn)行了研究。
The fact that the local dynamical model has superior performance of predicting the reverberation sequence to the classical random ar model also reveals that the reverberation is more suitable for the deterministic model 比較經(jīng)典的隨機(jī)ar模型和局部動(dòng)力學(xué)線性模型的預(yù)測(cè)性能,發(fā)現(xiàn)后者平均相對(duì)誤差小,可預(yù)測(cè)長(zhǎng)度長(zhǎng)。這個(gè)事實(shí)在一定程度上(至少?gòu)念A(yù)測(cè)的角度看)說(shuō)明混響過(guò)程更適合于確定性建模。
The results indicate that the scheme obtained from the fuzzy model can meet more load demand than that obtained from the deterministic model with a slight declination in the cost of objective function , and has a strong suitability for the uncertain environment 結(jié)果表明,模糊優(yōu)化規(guī)劃模型與確定性優(yōu)化模型相比,其規(guī)劃方案能夠在成本大體不變的情況下,滿足更多的可能性負(fù)荷的需求,且對(duì)未來(lái)的不精細(xì)環(huán)境具有更強(qiáng)的適應(yīng)性。
In order to utilize the frquency resource adequately and increase the capacity of mobile communication system , the wireless electric wave propagation of existing mobile system always adopts the microcell structure . forecasting the path loss characteristic of electric wave accurately can provide the necessary condition for the layout and design of wireless network , at the same time it is a precondition for the research on the microcell mobile system . the methods of forecasting of wireless electric wave propagation can divide into two parts : one is pluse and respond , that is establish the empirical model based on experimental and statistical data ; the other is ray tracing method , that is establish the deterministic model based on theoretical analyse . the paper discuss the characteristic of wireless signal electric wave transmition in symmetrical atmosphere of earth , and introduce the common path loss transmition model in land mobile communication system , also point out the localization of these models based on experiential methods 而精確預(yù)測(cè)無(wú)線電波傳播路徑損耗特性,則為合理的微蜂窩無(wú)線網(wǎng)絡(luò)規(guī)劃、設(shè)計(jì)提供了必要條件,同時(shí)也是研究微蜂窩移動(dòng)通信系統(tǒng)性能的前提。無(wú)線電波傳播預(yù)測(cè)的方法分為兩類:一是用沖激響應(yīng)法,即根據(jù)實(shí)驗(yàn)、統(tǒng)計(jì)所得數(shù)據(jù)建立經(jīng)驗(yàn)性傳播預(yù)測(cè)模型;另一種是用射線跟蹤方法,即依據(jù)理論分析來(lái)建立確定性的傳播預(yù)測(cè)模型。本文首先討論了在地球表面均勻大氣中的無(wú)線電波傳播的基本特性,介紹了陸地移動(dòng)通信系統(tǒng)中常用的幾種電波傳播路徑損耗經(jīng)驗(yàn)性預(yù)測(cè)模型,并指出了這些經(jīng)驗(yàn)性傳播模型對(duì)于微蜂窩小區(qū)無(wú)線電波傳播特性研究的局限性。
Method of ascertaining main effecting factors in dam mathematics safety monitoring model during construction period is studied . and dam safety monitoring model during construction period is founded , including statistic model , deterministic model and hybrid model . moreover , traditional regression model is improved , based on deeply studying robustified least squares method ( 2 )研究了大壩施工期數(shù)學(xué)安全監(jiān)控模型中各主要影響因素的確定方法及因子的選擇原理,并建立了大壩施工期安全監(jiān)控模型(統(tǒng)計(jì)數(shù)學(xué)模型、確定性數(shù)學(xué)模型和混合數(shù)學(xué)模型) ;此外,在深入研究抗差最小二乘法的基礎(chǔ)上,對(duì)傳統(tǒng)的回歸模型進(jìn)行了改進(jìn)。