數學期望值 的英文怎麼說

中文拼音 [shǔxuéqīwàngzhí]
數學期望值 英文
mathematical expectation
  • 數 : 數副詞（屢次） frequently; repeatedly
  • 學 : Ⅰ動詞1 （學習） study; learn 2 （模仿） imitate; mimic Ⅱ名詞1 （學問） learning; knowledge 2 （學...
  • 期 : 期名詞[書面語]1. （一周年） a full year; anniversary 2. （一整月） a full month
  • 望 : Ⅰ動詞1 （向遠處看） look over; gaze into the distance; look far into the distance 2 （探望） visi...
  • 數學 : mathematics
  • 期望值 : desired value
  • 期望 : 1. （抱有希望的想法） hope; expectation 2. （希望; 期待） hope; expect; wish
  1. Facilitating the configuration of protocol parameters, optimization of protocol operations, and more exact estimation of protocol performance, etc. basing on combinatorial theory and asymptotic method, we analyzed the properties of manets with nodes uniformly distributed in rectangular region. mathematical formulas of some basic properties of manets are obtained, such as the expected number of wireless links, mean node degree, the relation between network connectivity and radio range

    因此本文第二章基於組合學方法和極限思想研究了矩形區域內節點均勻分佈的無線自組網的幾項基本屬性，網路中鏈路總數的期望值，網路中節點度數分佈情況，以及網路連通性與無線信號傳輸半徑的關系等，得出了其解析描述。
  2. Expected value of finite fission chain lengths of pulse reactors

    脈沖堆有限裂變鏈長的數學期望值分析
  3. 11 luo x, zhang c, jennings n r. a hybrid model for sharing information between fuzzy, uncertain and default reasoning models in multi - agent systems. international journal of uncertainty, fuzziness and knowledge - based systems, 2002, 10 : 401 - 450. 12 hindriks k v, de boer f s, der hoek w van, meyer j j c. formal semantics of an abstract agent programming language

    Agent行動選擇和目標更新不僅依賴于agent的不確定信念，而且依賴于agent在實施這些行動的時候的得失效應值在此，把點概率的效應理論擴展到了區間概率的情況，並借用模糊數學中區間數的方法，給出了比較區間最大期望效應的方法再次，關于實用推理的不確定性的繁殖，使用了基於預設決策理論的預設邏輯方法。
  4. The students in northwest a & f science & technology university had accepted random sampling questionnaire survey and their recognition and consumption propensity of grape wine products were summed up as follows : most university students knew little about the basic knowledge of grape wine products ; most university student liked the taste of sweet - type grape wine and refused the taste of dry grape wine ; the currently - accepted price of grape wine among university students was about 15 chy ; most university students were interested in grape wine and expected grape wine drinking and the health value of grape wine was of great concern ; almost half university students believed that grape wine would be daily consumption goods soon with the increase of peoples ' living standards ; most university students were eager to know more about grape wine culture

    摘要以西北農林科技大學北校區大學生為調查對象，通過隨機抽樣問卷調查，得出大學生對葡萄酒產品認知及消費傾向如下：大學生對葡萄酒產品基本知識了解較少；多數大學生喜歡甜型葡萄酒的口感，對于干型葡萄酒的口感接受程度普遍較低；大學生普遍接受的葡萄酒價格應該在15元左右；多數學生有興趣了解並期望飲用葡萄酒，葡萄酒的保健價值很受關注；有近一半的大學生認為隨著人們生活水平的不斷提高，葡萄酒會走進尋常百性家；大學生渴望了解更多的葡萄酒文化。
  5. Stock was born more than 300 years ago. though there are more classical stock investment theories, those theories which apply morden arich to analyze the stock market with date triumplantly cannot be seen usually. this paper combination : the system engineering theories, the stock certificate investment theories, the statistics theories, the western economics theories. and the finance accounting theories, independence to bring up : the method of the coefficient change of the frame of reference, the energy theories of the stock market. and excerpt the analysis method of expectation - effect

    本文結合：系統工程、證券投資、概率論與數理統計、西方經濟學與財務會計學等理論，提出了：參照繫系數變動法，能量理論；引用了期望效用分析法以及即將撰寫的中值股票理論，股市風險理論等組成一個完整的股市預測與分析系統，希望為廣大股民提供一種簡單實用、準確及時的分析工具。
  6. The security of the algorithm is analyzed from the randomness, linear complexity of the chaotic sequence and the intensity of initial key. the results show the randomness of the key sequence pass the frequency test, sequential test, poker test, autocorrelation test, runs test, etc. and the total level is better than the binary sequence generated by the prng of delphi 7. 0, logistic chaotic system and rc4, the linear complexity comes up to the expectation, the initial key has very strong intensity

    本文最後從混沌序列的隨機性、線性復雜度和初始密鑰的強度三個方面對演算法進行了安全性分析，結果表明演算法產生的密鑰序列的隨機性完全通過了頻數檢驗、序列檢驗、撲克檢驗、自相關檢驗和遊程檢驗等5種統計檢驗方法的檢驗，而且整體水平要好於delphi7 . 0中的偽隨機數發生器、 logistic混沌系統和rc4三種方法產生的二進制序列，線性復雜度達到了數學期望值。
  7. The trigger time of decision - making is handled as random variables. after computing the expectation on the distribution function, the approximate solution can be got by employing numeric techniques to the target function that involves european option pricing formula

    通過把決策觸發時間隨機化以及針對分佈函數求數學期望等手段，可以利用歐式期權定價公式得到問題的數值近似解。
  8. Abstract : a new method, collaborative allocation ( ca ), is proposed to solve the large - scale optimum allocation problem in aircraft conceptual design. according to the characteristics of optimum allocation in aircraft conceptual design. the principle and mathematical model of ca are established. the optimum allocation problem is decomposed into one main optimization problem and several sub - optimization problems. a group of design requirements for subsystems are provided by the main system respectively, and the subsystems execute their own optimizations or further provide the detailed design requirements to the bottom components of aircraft, such as spars, ribs and skins, etc. the subsystems minimize the discrepancy between their own local variables and the corresponding allocated values, and then return the optimization results to main optimization. the main optimization is performed to reallocate the design requirements for improving the integration performance and progressing toward the compatibilities among subsystems. ca provides the general optimum allocation architecture and is easy to be carried out. furthermore, the concurrent computation can also be realized. two examples of optimum reliability allocation are used to describe the implementation procedure of ca for two - level allocation and three - level allocation respectively, and to validate preliminarily its correctness and effectiveness. it is shown that the developed method can be successfully used in optimum allocation of design requirements. then taking weight requirement allocation as example, the mathematical model and solution procedure for collaborative allocation of design requirements in aircraft conceptual design are briefly depicted

    文摘:探討了一種新的設計指標最優分配方法- -協同分配法，用於處理飛機頂層設計中的大規模設計指標最優分配問題.分析了飛機頂層設計中的設計指標最優分配特徵，據此給出了協同法的原理並建立了數學模型.協同法按設計指標分配關系將最優分配問題分解為主系統優化和子系統優化，主優化對子系統設計指標進行最優分配，子優化以最小化分配設計指標值與期望設計指標值之間的差異為目標，進行子系統最優設計，或對底層元件（如飛機翼梁、翼肋和翼盒等）進行設計指標最優分配，並把最優解信息反饋給主優化.主優化通過子優化最優解信息構成的一致性約束協調分配量，提高系統整體性能，並重新給出分配方案.主系統與子系統反復協調，直到得到設計指標最優分配方案.兩層可靠度指標分配算例初步驗證了本文方法的正確性與可行性，三層可靠度指標分配算例證明了本文方法的有效性.最後，以重量指標分配為例，簡要敘述了針對飛機頂層設計中設計指標協同分配的數學模型和求解思路
  9. A new method, collaborative allocation ( ca ), is proposed to solve the large - scale optimum allocation problem in aircraft conceptual design. according to the characteristics of optimum allocation in aircraft conceptual design. the principle and mathematical model of ca are established. the optimum allocation problem is decomposed into one main optimization problem and several sub - optimization problems. a group of design requirements for subsystems are provided by the main system respectively, and the subsystems execute their own optimizations or further provide the detailed design requirements to the bottom components of aircraft, such as spars, ribs and skins, etc. the subsystems minimize the discrepancy between their own local variables and the corresponding allocated values, and then return the optimization results to main optimization. the main optimization is performed to reallocate the design requirements for improving the integration performance and progressing toward the compatibilities among subsystems. ca provides the general optimum allocation architecture and is easy to be carried out. furthermore, the concurrent computation can also be realized. two examples of optimum reliability allocation are used to describe the implementation procedure of ca for two - level allocation and three - level allocation respectively, and to validate preliminarily its correctness and effectiveness. it is shown that the developed method can be successfully used in optimum allocation of design requirements. then taking weight requirement allocation as example, the mathematical model and solution procedure for collaborative allocation of design requirements in aircraft conceptual design are briefly depicted

    探討了一種新的設計指標最優分配方法- -協同分配法，用於處理飛機頂層設計中的大規模設計指標最優分配問題.分析了飛機頂層設計中的設計指標最優分配特徵，據此給出了協同法的原理並建立了數學模型.協同法按設計指標分配關系將最優分配問題分解為主系統優化和子系統優化，主優化對子系統設計指標進行最優分配，子優化以最小化分配設計指標值與期望設計指標值之間的差異為目標，進行子系統最優設計，或對底層元件（如飛機翼梁、翼肋和翼盒等）進行設計指標最優分配，並把最優解信息反饋給主優化.主優化通過子優化最優解信息構成的一致性約束協調分配量，提高系統整體性能，並重新給出分配方案.主系統與子系統反復協調，直到得到設計指標最優分配方案.兩層可靠度指標分配算例初步驗證了本文方法的正確性與可行性，三層可靠度指標分配算例證明了本文方法的有效性.最後，以重量指標分配為例，簡要敘述了針對飛機頂層設計中設計指標協同分配的數學模型和求解思路
  10. Realization of improved bp algorithm - single output three layers " artificial neural network generator base on improved bp algorithm has been developed by the author, and the generator has some functions that the number of neuron in first and second layer and theirs related training parameters such as learning rate. momentum factor a and the value of sum error e can all be self - defined by the users ; connection weights and threshold in each layer ' s neuron training data and teaching signals can also be input or modified in the friendly interface

    生成器功能是:網路結構中的第一、二層神經元個數和訓練參數中的學習速率粉，動量因子a和期望誤差值:可由用戶在一定范圍內自定義;各層的權值、閥值、網路初始樣本值及教師值可在友好的界面下輸入、修改。
  11. By establishing a dynamic mathematic model, this dissertation works out a reasonable solution to the distribution of individual assets among consumption, investment and insurance purchasing in order to achieve the maximum expected utility of consumption and final wealth endowment

    本論文通過建立動態的數學模型，解決投資者的資產在消費、投資和購買保險之間進行合理分配，以達到個人期望消費效用和終值財富效用最大化。
  12. By fem, the numerical simulation was carried out according to such models, many important hemodynamic variables, such as the tempo - spatial velocity field at every cross section of the artery, the pressure distribution, the secondary flow and the wss ( wall shear stress ) at the specific areas were obtained, which will help understand the biomechanics of coronary atherosclerosis furtherly. many investigators studied the stenotic artery by means of 2 dimensional models, which can only simulate the planar pulsatile waves and got, to some extent, some general results of the blood flow without considering the secondary flow and the reality of physiological conditions

    本文的著眼點和研究的目的在於，希望利用在血流動力學方面的研究優勢，用有限元方法對動脈粥樣硬化的血流動力學問題進行數值模擬，研究動脈粥樣硬化在生成和發展過程中的血流動力學、血管壁生理及生物力學性能的變化規律，以及這兩種變化規律之間的相互作用與動脈粥樣硬化的發生和發展的關系，通過大量算例的對比分析，以期在這方面作些基礎而有實際價值的工作。
  13. According to the principle i. e. the investor obtains only the expected minimum benefit when npv is zero, based on the analysis of various factors effecting the cash flow of gas investment, the parameters related with the reserves are expressed as the function of reserve scale, and the mathematical model is developed to determine the gas minimum economic resources taking the resources as a variable and given npv is zero, which pro vides a decision making method for gas exploration invest merit

    根據投資凈現值為零時投資者只獲得最低期望收益的原理，在分析影響天然氣投資現金流量各因素的基礎上，將與儲量相關的參數表示為儲量規模的函數，並以儲量規模作為變數通過令凈現值為零得到確定天然氣最低經濟儲量規模的數學模型，從而為天然氣勘探投資提供一種決策方法。
  14. But the standard mc has some shortcomings : firstly, the standard mc picks up isosurfaces by threshold, however, threshold segmentation is invalid for picking up tissues or organs from some medical images ; secondly, the standard mc pocesses cubes one by one, that is to say, all the cubes will be checked, and the algorithm spents 30 % - 70 % of time to check the null units, so we need a reasonable data structure to travel the space data and accelerate the checking or filting of null units ; thirdly, the standard mc has a large scale of triangles, normally, the tissue or organ reconstructed includes hundreds of thousands so much as millions of triangles, this means it hardly to execute real - time rendering or interaction ; lastly, the standard mc can not get the very smoothly surface mesh, and there will be some unexpected accidented cases, especially in the case of big errors in oringinal data

    但是標準mc演算法存在較大的問題:標準mc演算法實質上是通過閾值分割來提取等值面，閾值分割對某些醫學圖像的組織或器官的提取難以得到較好的效果;標準mc演算法是逐個移動立方體來進行處理，就是說對所有的立方體都要進行一次檢測，演算法執行中30 % ~ 70 %的時間用在對空單元的檢測上，因此需要有一種合理的數據結構對空間數據進行有效的遍歷，以加速對空單元的檢測和過濾;標準mc演算法產生了大量的三角面片，一般重建的組織或器官包含數十萬甚至上百萬的三角面片，難以實現實時的繪制和交互操作;標準mc演算法得到的表面網格並不光滑，會有一些不期望的凹凸，特別是在原始數據有較大誤差的情況下尤其突出。
  15. Abstract : two computational techniques for inverse fight dynamics, namely derivation - iteration and integration - iteration techniques, are investigated. the application of inverse dynamics to determine control power requirements for post - stall maneuvering is researched, and a maneuvering flight trajectory based algorithm is provided, which lays a numerical foundation for simplifying design criteria for post - stall aircraft. with the model of inverse dynamics employed, a flight control mode for the outermost loop of the control system, named maneuver generator, is designed to follow desired complicated maneuvering flight trajectories. an example of rapid heading - reversal maneuver and other numerical simulations show the feasibility of the algorithm and the design idea

    文摘:考察了求解輸入類飛行逆動力學問題的微分-迭代與積分-迭代演算法;探討了利用逆動力學確定過失速機動操縱效能要求問題，這構成了進一步提出過失速機動飛機設計簡化判據的數值基礎;利用逆動力學設計機動發生模塊進行飛控系統的最外環控制，以便跟蹤期望的復雜機動軌跡.飛機最速反向示例及其它數值模擬結果表明設計思想與演算法是可行的
  16. Firstly, by selecting and defining the resource load indexes rationally, lbmr take into consideration the effect on the resource usage of source node and destination node by the migrant. by means of vector operations, lbmr can use multiply resources in harmony. secondly, lbmr adopts the smallest k - subset random algorithin, and the load index information is provided by the information cache

    Lbmr演算法的主要思想有三點：第一，基於合理選擇和定義的資源負載向量，綜合考慮進程遷移對源節點和目標節點資源利用率的影響，通過向量運算協調多種資源的平衡使用；第二，基於最小k子集隨機演算法，採用信息cache提供的負載信息作為負載平衡演算法位置策略的選擇依據；第三，基於進程生命時間的概率分佈，根據遷移進程減速（ slowdown ）數學期望值的改善程度，選擇適合於遷移的進程。
分享友人
分享到 Line

分享到臉書