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排序方式: 共有439条查询结果,搜索用时 15 毫秒
1.
贺志明 《江汉大学学报(社会科学版)》2002,19(4):11-12
从普通集族{Xt}t?T(T为无限集)的直积Ⅱt?TXt出发,给出模糊集族At?F(Xt)(t?T)的直积概念;将通常的映射?:Ⅱt?TXt→Y扩展为模糊集族的直积Ⅱt?TF(Xt)到Y上的模糊集F(Y)的映射。 相似文献
2.
We re-evaluate Andreu and Spanos's findings in favour of trend stationarity by considering the extended Nelson-Plosser data set. This expanded (to 1988) data set includes a period of rather different behaviour compared with the original Nelson-Plosser data used by Andreou and Spanos. We find that Andreou and Spanos's models (with only minor adjustments) exhibit remarable stability over this extended period, and indicate that their conclusions are more robust than they have shown. 相似文献
3.
军机备件需求量修正的粗糙集方法 总被引:2,自引:0,他引:2
本文针对不可量化因素对军机备件需求量的影响,提出了基于粗糙集的备件需求量的修正方法。考虑不可量化因素存在多值性的问题,将不可分辨关系下的经典粗糙集方法拓展成相容关系下的扩展粗糙集方法,通过相容关系下的近似空间获取决策规则,再由决策规则得到修正系数。最后以轮胎类器材为例,说明了修正系数的获取过程。 相似文献
4.
5.
Discrete‐choice models are widely used to model consumer purchase behavior in assortment optimization and revenue management. In many applications, each customer segment is associated with a consideration set that represents the set of products that customers in this segment consider for purchase. The firm has to make a decision on what assortment to offer at each point in time without the ability to identify the customer's segment. A linear program called the Choice‐based Deterministic Linear Program (CDLP) has been proposed to determine these offer sets. Unfortunately, its size grows exponentially in the number of products and it is NP‐hard to solve when the consideration sets of the segments overlap. The Segment‐based Deterministic Concave Program with some additional consistency equalities (SDCP+) is an approximation of CDLP that provides an upper bound on CDLP's optimal objective value. SDCP+ can be solved in a fraction of the time required to solve CDLP and often achieves the same optimal objective value. This raises the question under what conditions can one guarantee equivalence of CDLP and SDCP+. In this study, we obtain a structural result to this end, namely that if the segment consideration sets overlap with a certain tree structure or if they are fully nested, CDLP can be equivalently replaced with SDCP+. We give a number of examples from the literature where this tree structure arises naturally in modeling customer behavior. 相似文献
6.
《Omega》2014
This paper presents an effective and efficient method for solving a special class of mixed integer fractional programming (FP) problems. We take a classical reformulation approach for continuous FP as a starting point and extend it for solving a more general class of mixed integer (0–1) fractional programming problems.To stress the practical relevance of the research we focus on a real-life application in paper production industry. The constantly advancing physical knowledge of large scale pulp and paper production did have a substantial impact on an existing DSS in which mixed integer (0–1) fractional programming is introduced. We show that the motivation to solve a real-life fractional programming problem can provide the basis for a new approach in a new context that has an added value of its own, even outside the given application area. We describe the main characteristics of the DSS, the necessity to develop a non-iterative solution procedure and demonstrate both the effectiveness and efficiency of the proposed approach from practical data sets. 相似文献
7.
《Journal of Statistical Computation and Simulation》2012,82(3-4):289-290
In adaptive estimation, it is often considered that an estimator has made a mistake if the component estimator chosen for use is not the most efficient for the distribution sampled. Theoretical and simulation results point to a fallacy in this line of thought. The Monte Carlo study involves extension of the Princeton Swindle to distributions conditional on a location and scale-free statistic, and to the uniform. The results give a partial explanation for the sometimes surprising robustness of adaptive L-estimators. 相似文献
8.
Assume that there are two types of insurance contracts in an insurance company, and the ith related claims are denoted by {Xij, j ? 1}, i = 1, 2. In this article, the asymptotic behaviors of precise large deviations for non random difference ∑n1(t)j = 1X1j ? ∑n2(t)j = 1X2j and random difference ∑N1(t)j = 1X1j ? ∑N2(t)j = 1X2j are investigated, and under several assumptions, some corresponding asymptotic formulas are obtained. 相似文献
9.
随着社会经济的发展及人口老龄化程度的不断加深,劳动力状况作为影响经济增长的重要因素引起社会各界的关注。然而,基于劳动力就业身份的雇员群体的描述性分析非常少。因此,本文利用2012年中国劳动力态调查(CLDS)数据,详细描述了他们受雇条件、受雇情况、劳动收益、工作状况及劳动侵权状况、工作评价及工作价值观;同时,分析了不同性别、年龄层及不同地区雇员群体在上述方面存在的差异,并对这些差异进行了一定的讨论,希望对相关劳动政策的制定有所启发。 相似文献
10.
申晶晶 《齐齐哈尔大学学报(哲学社会科学版)》2014,(5):122-124
关于[主题]和[主语]这两个词,对于日语学习者来说一点都不陌生。很多讲授者在回答这两个词的区分问题时,都会以「は」和「が」的区分作为分析的论点。「は」是表示主题,而「が」则表示主语。表面上看已经解决了关于主题和主语的区分,但实不则然。本文将从汉日互译的角度出发,基于「は」和「が」的基本含义之上,分析[主题]和[主语]的汉日对照。 相似文献