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1.
该文以数学方法论证了一类网络成本分配函数的性质,证明了成本分配函数具有规范形式的充要条件是它满足无记名性,可加性和等价性。并进一步论证了若成本分配函数还具有对成员数的单调递减性,它必是下游均等分配函数。  相似文献   

2.
样条函数磨光法对成本预测方法的改进   总被引:2,自引:0,他引:2  
本文利用函数逼近理论对成本预测给出了一个精度更高的方法。  相似文献   

3.
本文利用函数逼近理论对成本预测给出了一个精度更高的方法.  相似文献   

4.
将分段函数划分为连结型分段函数,分离型分段函数和它们的组合形式三种类型,得到了分离型分段函数是初池数的充分必要条件,完整地解决了分离型分段函数与初等函数之间的关系,并且给出了初等函数在其行一截取集上的限制函数(截取函数)仍然是初等函数的结果。  相似文献   

5.
所谓抽象函数就是未给出具体解析式的函数,由于其表达形式的抽象和性质的隐含不露,使得直接求解的思路常难以寻求,再加上还要用到赋值法和配凑技巧,使同学们对抽象函数问题比较害怕,其实,大量的抽象函数都是以中学阶段所学的基本函数为背景抽象而成的,我们称这类基本函数为背景函数,解题时若能根据题设条件,通过类比、联想,猜想出它可能为某种基本函数,然后从这一抽象函数的背景函数入手,就能变抽象为具体,从而会使你的解题思路自然而来。  相似文献   

6.
广义部分Bent函数和广义Bent函数的关系   总被引:5,自引:0,他引:5  
Bent函数是一类特殊的布尔函数,因其非线性性和稳定性在密码学和通信等领域有很重要的应用,但它们数量少,不平衡且无相关免疫性,为了弥补Bent函数的不足,Claud Carlet提出了部分Bent函数的概念,部分Bent函数是包含Bent函数的更大的函数类,后来,人们又将这两种函数概念先后都拓广到了环zm^n(m为正整数)上,分别被称为zm^n上的广义Bent函数和广义部分Bent函数,本文利用zp^n(p为素数)上广义部分Bent函数的Chrestenson循环谱特征讨论了zp^n上的广义部分Bent函数和广义Bent函数之间的关系,给出了这两种函数之间的函数关系式和谱值关系式。  相似文献   

7.
关于整函数的亏函数   总被引:1,自引:0,他引:1  
设f(ζ)为超越整函数,则它和它的各级导函数与原函数的亏函数的亏量满足关系这里的集合Af,将在§1中给出.设f(z)的下级μ<+∞.如果上式成立等号,则有i)f(z)的级与下级相等,且为正整数:ii)Af中的元素个数不超过μ;iii)每个δ(ak,ι,f)均为的整数倍;iv)每个ak,ι均为f(k)的渐近函数.  相似文献   

8.
文[1]否定了司本志老师的猜想,指出“存在正三棱柱和正四棱柱,使其体积函数的导函数等于表面积函数.”笔者进一步发现:  相似文献   

9.
本给出分布余弦函数的定义,其中包括生成元为多值算子情形,并讨论退化性型分布余弦函数与退化型二阶Cauchy问题、退化型积分余弦函数的关系,最后说明了非退化分布余弦函数的生成元亦生成正则余弦函数。  相似文献   

10.
门德荣 《数学通报》2002,(11):43-45
在高中教材中 ,有分段函数定义 :“有些函数在它的定义域中 ,对于自变量x的不同取值范围 ,对应法则不同 ,这样的函数通常称为分段函数” .分段函数在现实的市场经济中有着广泛的应用 .就在近年来的高考试题中也常出现 .现举例如下 ,供学习参考 .1 “工业生产”问题例 1 某车间生产某种产品 ,固定成本 2万元 ,每生产一件产品成本增加 1 0 0元 ,已知总收益R(总收益指工厂产品的全部收入 ,它是成本与总利润的和 ,单位 :元 )是年产量Q(单位 :件 )的函数 ,满足关系式R =f(Q)=40 0Q-12 Q280 0 0 0 (0 ≤Q ≤ 40 0 ) ,(Q >40 0 ) .求…  相似文献   

11.
In this paper the impulsive control of Feller Markov processes on compact state space with long run average cost criterion is studied. Under the assumption of compactness of the resolvent operator the optimal strategies corresponding to general cost for impulses are constructed. Also the case of purely jump Markov processes is considered  相似文献   

12.
Conditions for the finiteness of long run costs and rewards associated with infinite recurrent Markov chains that may be discrete or continuous in time are considered. Without resorting to results from the theory of Markov processes on general state spaces we provide instructive proofs in the course of which we derive auxiliary results that are of interest in themselves. Potential applications of the finiteness conditions are outlined in order to elucidate their high practical relevance.  相似文献   

13.
研究包含生产同质电力产品的两组 (种群 )企业——低成本发电企业和高成本发电企业的发电侧电力市场的长期均衡问题 .应用演化博弈论的有限种群演化稳定战略概念 ,证明了有限种群的演化稳定战略产量分别等于两组 (种群 )企业的竞争产量 .通过建立基于企业战略模仿和试验的随机演化模型 ,分析了发电侧电力市场长期均衡的演化过程 .  相似文献   

14.
给出了二元周期序列的自相关性质与其游程性质之间的关系,作为一个应用,我们给出了周期为1 2的零自相关窗大于等于6的所有序列.  相似文献   

15.
利用向量自回归(VAR)技术,从收支一体化的角度对1978年以来我国政府公共支出和税收政策变化对经济增长的冲击以及这些冲击在GDP长期走向中的解释能力作了系统的实证研究.实证分析结果表明,我国改革开放以来的财政政策队经济运行的宏观调控方面冲击效应明显,政府的收支行为对经济的长期走向有一定的解释能力.  相似文献   

16.
The maintenance policy for a product's life cycle differs for second‐hand and new products. Although several maintenance policies for second‐hand products exist in the literature, they are rarely investigated with reference to periodic inspection and preventive maintenance action during the warranty period. In this research, we study an optimal post‐warranty maintenance policy for a second‐hand product, which was purchased at age x with a fixed‐length warranty period. During the warranty period, the product is periodically inspected and maintained preventively at a prorated cost borne by the user, while any product failure is only minimally repaired by the dealer. After the warranty expires, the product is self‐maintained by the user for a fixed‐length maintenance period and the costs incurred during this time are fully borne by the user. At the end of the maintenance period, the product is replaced with a product of the user's choice. This study is focused on the determination of an optimal length for the maintenance period after the warranty expiration. As a criterion for the optimality, we adopt the long‐run mean cost during the second‐hand product's life cycle from the user's perspective. Finally, our results are analyzed numerically for sensitive analysis of several relevant factors, assuming that the failure distribution follows a Weibull distribution.  相似文献   

17.
As many products are becoming increasingly more reliable, traditional lifetime-based burn-in approaches that try to fail defective units during the test require a long burn-in duration, and thus are not effective. Therefore, we promote the degradation-based burn-in approach that bases the screening decision on the degradation level of a burnt-in unit. Motivated by the infant mortality faced by many Micro-Electro-Mechanical Systems (MEMSs), this study develops two degradation-based joint burn-in and maintenance models under the age and the block based maintenances, respectively. We assume that the product population comprises a weak and a normal subpopulations. Degradation of the product follows Wiener processes with linear drift, while the weak and the normal subpopulations possess distinct drift parameters. The objective of joint burn-in and maintenance decisions is to minimize the long run average cost per unit time during field use by properly choosing the burn-in settings and the preventive replacement intervals. An example using the MEMS devices demonstrates effectiveness of these two models.  相似文献   

18.
Identical components are considered, which become obsolete once new‐type ones are available, more reliable and less energy consuming. We envision different possible replacement strategies for the old‐type components by the new‐type ones: either purely preventive, where all old‐type components are replaced as soon as the new‐type ones are available; either purely corrective, where the old‐type ones are replaced by new‐type ones only at failure; or a mixture of both strategies, where the old‐type ones are first replaced at failure by new‐type ones and next simultaneously preventively replaced after a fixed number of failed old‐type components. To evaluate the respective value of each possible strategy, a cost function is considered, which represents the mean total cost on some finite time interval [0, t]. This function takes into account replacement costs, with economical dependence between simultaneous replacements, and also some energy consumption (and/or production) cost, with a constant rate per unit time. A full analytical expression is provided for the cost function induced by each possible replacement strategy. The optimal strategy is derived in long‐time run. Numerical experiments conclude the paper. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   

19.
The multiple objective optimization models for capacity expansion problem of power generation system in the long run as a base for setting up the marginal abatement cost were examined. In the optimization model the objective function is considered as the weighted sum of several objective functions. Air pollutants are taken into account in both the objective function and the constraints. Different scenarios of pollutant reduction were analyzed. The periods of the years 2003–2013 were taken into account and the results are based on the real data of the Israel electricity sector. Several environmental policies were considered by using the CAPEX system to evaluate the environmental and economic deficiencies in different abatement cost scenarios. The following are obtained: abatement cost for each pollutant, amount of emissions and additional cost connected with the pollutants. Modern decision tools are implemented, such as data envelopment analysis (DEA) and reasonable goal method/interactive decision maps (RGM/IDM) technique as a base for decision-makers to make decisions on energy and environmental policy.  相似文献   

20.
最优过程均值和生产运行长度的确定   总被引:2,自引:1,他引:1  
实际生产中,过程均值由于受到随机振荡的影响,经常从受控状态逐渐漂移到失控状态,从而导致大量不合格品的出现.针对这种情况,本文假定随机振荡次数服从泊松过程,每次振荡引起过程均值漂移相互独立且服从同一指数分布,结合不对称田口质量损失函数,建立了最佳初始过程均值的经济模型,并讨论了最优生产运行长度的确定.通过与初始过程均值设置在目标值处的情形比较,说明本文模型对降低生产成本的有效性。灵敏度分析表明了各参数对最优过程均值和生产运行长度的影响.  相似文献   

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