極值預測 的英文怎麼說
中文拼音 [jízhíyùcè]
極值預測
英文
prediction of extremum-
The results show that evt performs better than lognormal pdf for real data sets characterized by high indoor radon concentrations
結果顯示極端值理論對高氡氣濃度分佈區域之預測佳於一般對數常態分佈模式。 。Based on consider hereinbefore, this dissertation discusses several aspects on the problem of the sustainable and optimum exploitation of groundwater resources as follows : ( 1 ) reviewed entirely the origin and evolvement of the concept " sustainable development ", stated and commented the study status in queue on " sustainable development " around national and international range, thorough discussed the science connotation about the concept " sustainable development " ; ( 2 ) looked back and commented across - the aboard some furthest basic concept and proposition related to groundwater resources, put forward self opinions on a few existent mistake points of view and chaos understandings ; ( 3 ) expatiated entirely on the content and meaning of the theory of changeable groundwater resources system, contrast with the traditional methods of groundwater resources calculation and evaluation, combined example to show the application of this theory ; ( 4 ) thorough analyzed the difficult and complexity to forecast the groundwater resources, fully stated the traditional methods of groundwater resources forecasting, pointed out the characteristic and applying condition of these forecasting method, introduced the main ideas and methods of wavelet analysis developed recently, and the matlab software be known as the fifths era computer language, and its accessory wavelet analysis toolbox, applied these methods and tools to analyze the groundwater dynamic curve, adopted the b - j method and morte - carlo method, combined with the theory of changeable groundwater resources system, discussed the new view on the forecast of groundwater resources ; ( 5 ) synthetically analyzed the characteristics and limitations of the present all kind of groundwater manage model, combined mathematical programming mathematical statistics random process and the theory of variation system of groundwater resources on the unite optimum attempter of surface water and groundwater, emphasized how to make the model more nicety, more simple, more practicality ; ( 6 ) analyzed the inside condition and outside condition to assure the sustainable and optimum exploi tation of groundwater resources, the inside conditions are the follows : correct resources idea, scientific methods of resources calculation and evaluation, credible forecast methods of resources, exercisable measures of resources management, the outside conditions are the follows : the development idea of high layer, the transform of manage system, the matched policy and rule of law, the adjusted of economy lever, the improve of cultural diathesis, the boosting up of water - saving consciousness and detail measures, the control of population rising, the prevention and cure of water pollute, the renew and rebuild of ecology ; ( 7 ) scan the sustainable and optimum exploitation of groundwater resources from the high level of metagalaxy, earth system science, and philosophy ; lint out the more directions on groundwater resources
基於以上考慮，論文主要從以下幾方面對地下水資源可持續開發問題進行了比較深入的探討：全面回顧了「可持續發展」概念的由來與演變，對國內外「可持續發展」的研究現狀進行了述評，並對「可持續發展」概念的科學內涵進行了深入探討；對涉及地下水資源的一些最基本的概念和命題進行了全面的回顧和評述，對目前仍然存在的一些錯誤觀點和混亂認識提出了自己的見解；全面闡述了地下水資源變值系統理論的內容和意義，並與傳統的地下水資源計算評價方法進行了對比分析，結合實例具體說明了方法的應用；深入分析了地下水資源預測預報工作的極端重要性和復雜性，對傳統的地下水資源動態預測方法進行了全面的評述，指出了各類預測預報方法的特點及適用條件，對最近二十多年剛發展起來的小波分析技術的主要思想和方法及其應用范圍，以及號稱第五代計算機語言的matlab軟體和附帶的小波分析工具箱進行了介紹，並應用於地下水動態過程線的分析，採用時間序列中的b ? j法，蒙特卡羅方法，與地下水資源變值系統理論相結合，探討了地下水動態資料分析和地下水資源預測預報的新思路；綜合分析了現今各類地下水管理模型的特點及缺陷，將數學規劃、數理統計、隨機過程等與地下水變值系統理論相結合進行地表水地下水或多水源的聯合優化調度，使模型更準確、更實用；對保證地下水資源可持續開發的內部條件和外部條件進行了分析，內部河海人學博卜學位論文前言、摘要、目錄條件主要是正確的資源觀，科學的資源計算與評價方法，可靠的資源預測預報技術，可操作的資源管理措施，外部條件主要是高層發展思路、管理體制的變革、配套的政策法規、經濟杠桿的調節、人文素質的提高、節水意識的增強及具體節水措施、人口增長的控制、水體污染的防治、生態的恢復和重建等;從宇宙科學、地球系統科學及哲學的高度審視地下水資源的可持續開發;指出了地下水資源可持續開發的進一步研究方向。One is the evt - based var model ( including gev model and gpd model ), the other is the quantile regression var model. secondly, i evaluate predictive performance of a selection of var models for chinese stock market data. these var models include riskmetrics method, historical simulation, monte carlo method, and the three recent models based on quantile regression and extreme value theory
本文首先重點探討了極值分佈var模型（包括廣義極值分佈和廣義帕雷托分佈兩個模型）和分位數回歸var模型；然後在此基礎上將六個var模型（包括上述三種模型、歷史模擬法、 riskmetrics方法以及蒙特卡洛法）實證應用於估計上證指數、上證180 、深證成指、深證綜指95 var和99 var ；同時採用區間預測法、損失函數法和符號檢驗法對這些var模型進行了選擇評估。Simulation on tig welding of aluminum alloy plate and residual stress predicting
鋁合金平板鎢極氬弧焊數值模擬與殘余應力預測The adaptation processing includes linear prediction coefficient adaptation and adaptation of quantization step size for residual signals. based on g. 726, we adopt a huffman coder to make use of probability statistic of bit cascade covering n ( n 1 ) samples generated from adpcm, in order to further reduce the bit rate. ng is lossless entropy coding, the speech quality of our improved algorithm should be same as that of g. 726 standard
我們的研究和改進工作包括:研究最優非均勻自適應量化器，及其自適應演算法;研究波形預測函數，以及函數零點、極點的自適應演算法;基於每n （ n 1 ）個樣本所對應符號的概率統計，對預測殘差量化值再進行huffman編碼，進一步降低比特率。Using feedback with prediction to control chaos, we also catch hold of the result of high - period, which has never been reached. the double feedback method is introduced to control the chaos and hyperchaos in a 2 - dimensions discrete system and the spatio - temporal open - flow models based on the method of the delayed feedback and the predict method. the condition under which chaos can be stabi lized could be educed by theoretical analysis
提出預測反饋控制與延時反饋控制組合的雙反饋控制方案，並將這一方案應用到對離散系統的混沌和超混沌的控制以及時空系統中混沌的控制；從理論上分析了具體系統採用此方案控制，系統能控制住的解析條件；理論和數值計算的結果都表明，使用組合的控制方案極大地拓寬了系統可控制的參數范圍，提高了控制質量，有利於實際應用。Then the stability of typical slopes in different conditions such as servoir water level ' s ascending, slowly descending and sharply descending are evaluated and forecasted by means of the limiting balance method and the numerical simulating method ( flac )
利用極限平衡法和數值法（ flac ）對庫區內的典型斜坡在庫水位上升、庫水位緩慢下降和庫水位驟降等不同工況條件下的穩定前景做出了合理的評價與預測。Energy estimating approach of fatigue crack initiation life for welded steel structures is obtained by using molski - glinka energy density equation, introducing the worst - case fatigue notch factor, and considering the effects of residual stress on fatigue
本文採用應力應變能密度的molski - glinka方程，建立了一種預測焊接鋼結構疲勞裂紋形成壽命的能量方法。該方法引入了極值疲勞切口系數，並考慮了焊接殘余應力對裂紋形成壽命的影響。The paper believes the " maximization of enterprise value " is the most reasonable objective. being in line with this objective function, we can establish a financial theory system in theory whose contextual logic is consistent and analysis is extract so as to promote healthy development of financing ; on the other hand, in practice, this objective function has the best ability for decision - making, whether investment decision - making or financing decision - making, we can select correct item if based on it. what ' s more, this objective function can provide good direction and regulation for enterprise value evaluation and financial objective realization, and it also can provide important guarantee for increment of enterprise value
本文通過比較分析，認為企業價值最大化是當前比較合理，承載內容極其豐富、極其關鍵的財務目標函數，依循這一目標函數，在理論上，我們可以構建一個前後邏輯一致、分析精到的財務理論體系，推動理財學的健康發展；在實務上，這一目標函數的決策能力極強，無論是投資決策分析還是融資決策分析均可以作出正確的選擇，且在企業價值預測與財務目標實現之間提供良好發指導和監督，為企業價值增值提供了重要的保障。Application of singular value decomposition method to analysis and prediction for voltage steady - state stability limit of sichuan power grid
奇異值分析法對四川電網電壓靜穩極限的分析預測Thirdly, the weight and threshold of bp neural network model was optimized by genetic algorithm ( ga ), which has stronger macroscopic search and global optimization property, based on bp network model of the preparation of superfine quartz powder. this model is named ga - bp, and improves the generalization capability and the parameters forecast precision of bp network model, and was proved to be correct by both theoretical analysis and experiment
再次，本文以粉石英制備的bp網路模型為基礎，利用遺傳演算法（ ga ）較強的宏觀搜索能力和良好的全局優化性能，對bp網路模型的權值和閾值進行優化，極大地提高了bp網路模型的泛化性能和參數預測精度，將經過ga優化后的bp網路模型簡稱為ga - bp網路模型。Finally, most supervised learning neural networks train themselves through minimizing mean squared error. but when the neural network models trained in this way are used to do forecasting, the existence of outliers result in great imprecision
最後，大多數監督學習神經網路是通過最小化訓練集的均方差來訓練網路，而野值的存在導致這種訓練的神經網路模型在預測時會產生極大的不精確性。In the meanwhile, we find is very unstable and quite weak at long - term prediction of stock returns after the in - depth research
在對值進一步的實證研究表明其極不穩定，其長期預測股票收益率的能力很差。The article first presentations the situation of dzsc, point out the problems, then analyses the tendency of civil shipping market, figures out that the shipping structure has changed, shipping companies will confront both opportunity and challenge once china joins wto. at last the article gives quantitative analysis on the freight quantity that the same companies as dzsc in dalian have taken. three different forecast methods are used to obtain the best results, and on this basis figures out that dzsc should remain take up the civil shipping market and at the same time prepare for accessing to overseas market
本文首先介紹中海航公司的基本情況，指出存在的問題；其次對國內沿海貨運市場的現狀和發展趨勢做出分析，認為運輸結構發生了變化，企業合作方興未艾，加入wto以後，航運企業將面臨機遇與挑戰；最後，對企業的貨運量進行定量分析，運用三種預測方法得到最佳預測值，並在此基礎上認為公司應進行國內沿海運輸，並做好積極的準備，以便在適當時機進入國際航運市場。According to meteor scientists, there will be two maxima for leonids this year, and hong kong may encounter the first one at dawn on 18 november. about 20 meteors per hour are predicted. however, as the meteoroids stream is less dense than 2001, the shower is expected to be less spectacular even with the absence of the moon
據專門研究流星的學者預測，今年的獅子座流星雨極大值即高峰期有兩個，香港可於11月18日凌晨遇上第一個，每小時可見約20顆流星，但由於流星物質已遠較2001時稀疏，故即使當日並無月光干擾，相信這次獅子座流星雨亦不會太壯觀。Secondly, inspired by the movement rule of the elastic objects of the physical world, a strategy that predicts the prospect of the search is obtained. it improves the performance of the search by early stopping the search that will get trapped in local minima ; inspired by the survival of the fittest principle of the nature, another strategy lets the search escape from local minima to the direction of better prospect by using the wisdom that human has accumulated in social events
第二，受物理世界中彈性物體運動規律的啟發，得到了一個預測搜索前景的策略，它通過及早地終止將會陷入局部極小值陷阱的搜索，提高了搜索的效率；受自然界中優勝劣汰規律的啟發得出另一個策略，它通過很好地利用人類在社會活動中積累的智慧，使搜索逃離局部極小值的陷阱，並走向更有前途的方向。Because evt mainly studies extreme value and models the tail of distribution financial return, it can effectively forecasts and guards against the financial risk on the condition of lacking of sample data. more and more people recognize the great potentials of evt dealing with the risk of extreme event. especially evt can be used in application to value at risk due to modeling the tail of distribution
極值理論主要以極值為研究對象，它注重模擬收益分佈的尾部，比較有效地解決了在缺少樣本的客觀條件下如何預測和防範金融風險的問題，因此，越來越多的人認識到極值理論在極端事件風險管理中的巨大潛力，特別指出的是極值理論是一種模擬收益分佈尾部的理論，所以可以應用於風險價值的測量。These rules consist of the total fit, the mathematics and fatigue physics, and the safety in tail predictions. an analysis of the test s - n data of 16mn steel weld joints reveals that the four models are reasonable if only considering the total fit as the conventional method did. but if by the present three rules, the appropriate models should be the normal or the extreme maximum value
根據先前提出的有限數據下良好假設分佈的確定方法，包括三個原則，即假設分佈形狀與誤差數據真實分佈形狀的一致性、預測的總體擬合效果、與疲勞失效機制的一致性和尾部預測的安全性，通過對線性均值s - n曲線擬合16mn鋼焊接頭s - n數據誤差的統計分析，說明應用一般推斷方法， 4種分佈都可合理地作為數據的統計模型，綜合考慮三原則后，極大值和正態分佈是可能的良好假設分佈。Using extremum statistical method to predict pit corrosion sizes of the pipeline in service and further to evaluate the residual strength of the pipeline has a great significance for controlling accidents of corrosive perforations, guiding pipeline rehabilitation and replacement as well as prolonging service life of pipeline
長輸管道的腐蝕類型多為均勻腐蝕或點腐蝕，採用極值統計方法對在役管道的點蝕尺寸進行預測，進而評價管道的剩餘強度，對于控制管道的腐蝕穿孔事故、指導管道的修復更換、延長管道的使用壽命具有重要意義。As an example, the ratios of the experimental value to the analytical value of ultimate strain of confined concrete are taken as random variables whose probability density function is estimated with the proposed method
以約束混凝土極限應變的試驗與理論預測值之比值為例，進行了概率密度函數估計。分享友人