期权定价法在FMS能力规划的风险描述中的应用

管理决策与优化问题中的风险描述是一个困难的问题，其原因在于管理科学在其模型求解完之前，不能分析出风险水平。本文利用期权定价理论在线性规划模型中描述风险，所提出的方法通过调整一个能力和资源水平以在规划模型中描述风险，避免了通常风险描述中的非线性问题，有关结果在柔性制造系统能力规划问题中进行了应用。     

Dating in the time of “relational filter bubbles”: exploring imaginaries,perceptions and tactics of Italian dating app users

ABSTRACT

In this paper, we address algorithmic imaginary, perception and tactics of Italian dating apps users. Little attention has hitherto been devoted to the ways in which the algorithms employed by mobile dating platforms (to rate users, to manage user visibility, to arrange results) might contrast, or enhance, people’s homophily. Our goal is to explore whether and how mobile dating algorithms modify the perception of what we define as “relational filter bubbles”; and whether, and how, users believe dating algorithms reshape (extend or limit) the heterogeneity of their intimate interactions. The paper builds on literature addressing online dating, the datafication of society, the rise of the so-called quantified self, and of the algorithmic culture. We organized 4 focus groups involving Italian dating apps users, who reported a variety of sexual orientations and of dating apps usage. Overall, while dating apps’ algorithms operate in an opaque way, participants developed an “algorithmic imaginary”. Moreover, they appreciate the role of mobile dating apps in reinforcing their relational homophily (their tendency to like people that are “similar” to them), whilst, at the same time, mainly using these apps for increasing the diversity of their intimate interactions in terms of extending their preexisting networks.     

两个加工时间恶化的半线性平行机排序问题的启发式MBLS 算法

The combination of online or semi-online with deterioration jobs has never been researched in scheduling problems. In this paper, two semi-online parallel machine scheduling problems with linear deterioration processing time are considered. In the first problem, it is assumed that the deterioration rates of jobs are known in an interval, that is, bj ∈[0, α], where 0 〈α≤ 1 and bj denotes the linear deterioration rate. In the second problem, it is assumed that the largest deterioration rate of jobs is known in advance, that is, b = max1≤j≤n {bj }. For each of the two problems, a heuristic MBLS algorithm is worked out and its worst-case ratio is analyzed. At the same time, the worst-case ratio of the list （LS） algorithm is investigated and it is proved that all the ratios are tight.     

关于排列的几种类型

排列组合内容抽象,富于技巧;它的思想方法也别具一格,知识间的联系,主要靠抽象思维来把握.它的解题技巧更是多种多样,灵活多变.有鉴于此,对排列问题进行详细分类,对于正确理解排列概念,进而准确进行排列数的计算是大有裨益的.列举了各种不同类型的排列,归纳总结了不同类型排列的计数公式.并通过典型例题的分析与解答,介绍解题的思想方法,给出解答各类题目的具体规律,并提供一些常用的解题技能和技巧.     

一种概率密度的中值滤波算法

提出了一种新的图象噪声消除算法,该方法可以快速有效地去除图象中的脉冲噪声,并保留图象的细节.该算法主要通过利用象素点的值在滤波窗口出现的概率密度信息,进行噪声的判定及滤波过程的介绍,对本算法进行了分析仿真,结果表明该算法去除噪声与保留细节的效果好,且运算速度较快.     

自适应信号分解实验装置

用开关电容滤波器和锁相环构成的二阶自适应带通滤波器,运用锁相环原理为开关电容滤波器提供时钟信号,使其带通滤波中心频率将跟随输入信号频率变化,克服了传统滤波器带通中心频率不易改变的缺点。实验结果表明,该滤波器较好地实现了自适应带通滤波的功能,可用于教学和科研中周期信号的分解。     

利用线阵CCD的迈克尔逊干涉仪测量压电材料的压电系数

将压电陶瓷片固定在迈克尔逊干涉仪的移动镜上,当加在压电陶瓷片上的驱动直流电压增加时,引起压电陶瓷的微小伸长进而引起移动镜的移动,引起光屏上干涉条纹环数目的变化;用线阵CCD(charge coupled device)作为光电传感器件捕捉干涉条纹的光强信号,再将电信号进行模数转换,采取USB接口与微机接口,用C++语言编写程序设计了一种新型的条纹自动计数软件,将这种计数方法与压电系数的测量结合起来,可以自动得出其压电系数.     

我国高中生科学素质影响因素分析

高中生是我国科技后备人才的主力军,其科学素质直接关系到我国未来科技水平,因此探讨我国高中生科学素质的影响因素,对于提高我国科技后备人才科学素质进而提升我国科技水平具有重要意义。本文利用我国高中生大规模基线调查数据,基于教育生产函数模型,分析了我国高中生科学素质的影响因素,结果表明:竞赛因素对高中生科学素质有显著影响,班级同伴因素有较大影响,学校因素有很大影响,而家庭因素有重要影响。为此,首先,应重视不断增强科技竞赛和学科竞赛活动对高中生科学素质的提升作用,缩小班级规模、加强合作学习,从而更好地发挥班级同伴效应对于促进高中生科学素质提升的作用;其次,要引导家长形成科学的教育方式,促进高中生科学素质的提高。此外,需要加强中小学科学教育过程中对学生科学素质培养的渗透,重点关注提高西部地区和非重点校高中生科学素质问题。     

Stabilization of Delayed Networks with Different Nodes

In this paper,the control of complex delayed networks with different nodes is proposed.Firstly,the stabilization of coupled networks with time delay is investigated.By constructing a Lyapunov function,a linear feedback controller design procedure for the networks is converted to the problem of solving a set of linear matrix inequalities.Then the results are extended to networks with both delayed dynamical nodes and delayed couplings.It is shown that the stabilization of complex networks is determined by the dynamics of each uncoupled node,coupling matrix and feedback gain matrix of networks.Two examples are simulated.In the first example,a network with 10 nodes consisting of Lorenz systems and systems proposed by Zhang in 2009 is given.It is found that the network states are divergent without control,and convergent under designed linear feedback controllers.In the second example,a larger network with 100 nodes consisting of delayed Chen systems and delayed Lorenz systems is given.The proposed method is also effective for large scale networks.     

广义线性模型极大似然估计弱相合性的数值模拟

广义线性模型是经典线性模型的自然推广,它是一类应用广泛的统计模型.选择Probit模型,利用matlab编程,通过数值模拟的方法验证了广义线性模型的极大似然估计的弱相合性.