Co-production of substitutable products

Co-production occurs when a production run produces, simultaneously, more than one type of product. In this paper, we consider co-production planning problems with stochastic yields, multiple processes, limited capacity and non-transitive product demand substitution. We show that these problems can be transformed to a structure where the demand substitutions are transitive. We address the decisions of how to select processes, to determine production quantities for each process and to allocate inventory to product demands. Finally, we provide simple heuristics and report on computational experiments done on randomly generated test cases.     

长笛一音多键不确定指法的应用研究

长期以来,长笛在演奏、教学及其实践中,存在着不确定键指法的不规范、不科学的问题。笔者通过长期的经验总结和调研,对这些问题初步作了探讨,以期对长笛的演奏、教学及初学者的规范性运指有一定的参考作用。     

读常见书札记

文章指出古今著述中存在的一些疑误之处 ,并加以辨析。     

带有时滞的不确定双线性系统的Robust镇定

研究了一类既有结构摄动又有状态时滞的双线性系统的Robust镇定问题。通过时滞微分不等式分析技巧,种用线性反馈,给出了简洁的Robust镇定的充分准則,获得了确定的镇定范围。文中还指出了文献[1]结论的错误性。     

非连续不确定时间股息和可修正执行价格的权证定价研究

本文通过引入股息期货合约这一概念,得出考虑了非连续不确定时间股息的欧式权证定价模型,并结合我国市场上通行的权证行权价格修正条款,研究出适合我国市场权证的、考虑非连续不确定时间股息和可修正执行价格的欧式权证定价模型。并以阿胶EJC1为例进行了实证研究,研究表明新的模型较经典的Black-Scholes模型能更优地对中国权证进行定价。研究还表明:权证的行权价格修正条款并不能完全消除股息发放对权证价值的影响,权证价值仍然因为股息发放而减少。     

对刑法中"可以"的思考

刑法规范模式中使用了大量的、带有两可倾向含义的“可以”,使得法律中的“可以”之行为就有了“可以为”和“可以不为”的两种选择,这就为司法实践带来了一定的难度。本文从“可以”的逻辑内涵入手,考察了刑法中“可以”存在的问题。     

居民消费需求不足的收入结构成因分析

近几年来 ,我国消费需求市场一直处于低迷状态 ,其原因是多方面的 ,如中国传统的消费模式、市场体系缺陷及收入不足等。本文从居民收入结构的角度探讨消费需求不足的成因 ,并提出相应的建议     

不确定环境下的企业临界竞争战略探微

通过对企业自组织临界态的特性、选择临界竞争战略的条件以及应遵循的原则和实施步骤的分析 ,提出一种通过改变临界态组织结构来寻求不确定环境下企业结构的稳定 ,包括临界边缘的无序平衡、时间平衡和战略变革的节奏平衡等 ,以提高企业适应环境变化的能力。     

Correlated Inputs in Quantitative Risk Assessment: The Effects of Distributional Shape

Application of Monte Carlo simulation methods to quantitative risk assessment are becoming increasingly popular. With this methodology, investigators have become concerned about correlations among input variables which might affect the resulting distribution of risk. We show that the choice of input distributions in these simulations likely has a larger effect on the resultant risk distribution than does the inclusion or exclusion of correlations. Previous investigators have studied the effect of correlated input variables for the addition of variables with any underlying distribution and for the product of lognormally distributed variables. The effects in the main part of the distribution are small unless the correlation and variances are large. We extend this work by considering addition, multiplication and division of two variables with assumed normal, lognormal, uniform and triangular distributions. For all possible pairwise combinations, we find that the effects of correlated input variables are similar to those observed for lognormal distributions, and thus relatively small overall. The effect of using different distributions, however, can be large.     

基于Heronian平均算子的Pythagorean模糊不确定语言决策方法

针对评价信息为Pythagorean模糊不确定语言数、属性权重未知且属性间相互影响的多属性决策问题,提出一种基于灰色关联法和Heronian平均算子的决策方法。首先,提出Pythagorean模糊不确定语言Heronian平均（PFULHM）算子和Pythagorean模糊不确定语言几何Heronian平均（PFULGHM）算子,并证明其满足幂等性、单调性、有界性及可交换性。考虑到属性权重之间重要程度的差异,定义了Pythagorean模糊不确定语言加权Heronian平均（PFULWHM）算子和Pythagorean模糊不确定语言加权几何Heronian平均（PFULWGHM）算子。其次,将灰色关联法运用到Pythagorean模糊不确定语言环境中求解属性权重。最后,提出基于PFULWHM算子和PFULWGHM算子的决策方法,并通过算例分析说明本文提出方法的有效性。