关于随机变量和的特征函数

给出一个两两独立但不相互独立的n(n≥3)个随机变量的一般形式上的反例，以此说明不相互独立的随机变量的和的特征函数可以等于各个分量特征函数的乘积．     

限滑差速器楔角的最优化设计

以限滑差速器的行星齿轮轴所受的压应力最小为目标函数，在确保扭矩比系数合适的前提下对限滑差速器进行了最优化设计。     

智能型接触器节能控制模块AJ2-I

新研制的ＡＪ２－Ｉ型智能接触器用控制模块具有延时闭合、节电和过流、过压、过热及三相不平衡等保护功能。本文介绍该模块的工作原理、主要功能和性能、电路及应用。     

Passing Loebner's Turing Test: A Case of Conflicting Discourse Functions1

This paper argues that the Turing test is based on a fixed and de-contextualized view of communicative competence. According to this view, a machine that passes the test will be able to communicate effectively in a variety of other situations. But the de-contextualized view ignores the relationship between language and social context, or, to put it another way, the extent to which speakers respond dynamically to variations in discourse function, formality level, social distance/solidarity among participants, and participants' relative degrees of power and status (Holmes, 1992). In the case of the Loebner Contest, a present day version of the Turing test, the social context of interaction can be interpreted in conflicting ways. For example, Loebner discourse is defined 1) as a friendly, casual conversation between two strangers of equal power, and 2) as a one-way transaction in which judges control the conversational floor in an attempt to expose contestants that are not human. This conflict in discourse function is irrelevant so long as the goal of the contest is to ensure that only thinking, human entities pass the test. But if the function of Loebner discourse is to encourage the production of software that can pass for human on the level of conversational ability, then the contest designers need to resolve this ambiguity in discourse function, and thus also come to terms with the kind of competence they are trying to measure.     

同步发电机励磁系统模糊逻辑控制

本文基于发电机每个瞬间的速度偏差及加速度偏差，按照相平面上的标准模糊隶属函数提出了高步发电机励磁模糊逻辑控制方法，其中控制器增益可自适应调整，通过仿真表明，模糊逻辑控制器对系统各种干扰能有效提高其稳定性并具有非常强的鲁棒性。     

Existence of unmixed solutions of the discrete-time algebraic Riccati equation and a nonstrictly bounded real lemma

The existence of a solution of the discrete-time algebraic Riccati equation is established assuming modulus controllability and positive semidefiniteness on the unit circle of the Popov function. As an application a nonstrictly bounded real lemma is obtained.     

上海中环线浦东段新建工程总体及立交设计

中环线浦东段(上中路越江隧道—申江路)新建工程是上海市城市快速路系统网络建设的重要项目,是连接浦东、浦西的快速交通。工程范围内,全线共设置全互通立交4座,均为枢纽型全互通立交(济阳路、杨高路、罗山路和申江路立交)。通过对节点的分析,确定立交定位,指导工程方案设计。     

Selection of a representative value function in robust multiple criteria sorting

We introduce the concept of a representative value function in robust ordinal regression applied to multiple criteria sorting problems. The proposed approach can be seen as an extension of UTADIS^GMS, a new multiple criteria sorting method that aims at assigning actions to p pre-defined and ordered classes. The preference information supplied by the decision maker (DM) is composed of desired assignments of some reference actions to one or several contiguous classes—they are called assignment examples. The robust ordinal regression builds a set of general additive value functions compatible with the assignment examples and results in two assignments: necessary and possible. The necessary assignment specifies the range of classes to which the action can be assigned considering all compatible value functions simultaneously. The possible assignment specifies, in turn, the range of classes to which the action can be assigned considering any compatible value function individually. In this paper, we propose a way of selecting a representative value function among the set of compatible ones. We identify a few targets which build on results of the robust ordinal regression and could be attained by a representative value function. They concern enhancement of differences between possible assignments of two actions. In this way, the selected function highlights the most stable part of the robust sorting, and can be perceived as representative in the sense of robustness preoccupation. We envisage two possible uses of the representative value function in decision support systems. The first one is an explicit exhibition of the function along with the results of the UTADIS^GMS method, in order to help the DM to understand the robust sorting. The other is an autonomous use, in order to supply the DM with sorting obtained by an example-based procedure driven by the chosen function. Three case studies illustrating the use of a representative value function in real-world decision problems are presented. One of those studies is devoted to the comparison of the introduced concept of representativeness with alternative procedures for determining a single value function, which we adapted to sorting problems, because they were originally proposed for ranking problems.     

Batch Grinding in Laboratory Ball Mills: Selection Function

The selection functions and the breakage distribution functions are based on the experimentally‐determined particle size distribution on the basis of comminution of one size fraction particles. Therefore, to obtain a clear picture of the product properties during comminution of the “real” polydisperse sample, a number of experiments are needed. This work introduces the tested methodology for the selection function determination based on the starting and maximal values of the selection function. The principle was tested on the planetary ball mill and the horizontal laboratory ball mill, and according to the results obtained, it can be concluded that the proposed methodology can be useful for the evaluation of the selection function during batch comminution in different mills.     

Markov迭代函数系统分形的动力学特性分析

研究Markov迭代函数系统(MIFS)的转移概率矩阵与MIFS吸引子分形结构之间的关系.首先提出了分支Markov迭代函数系统的概念并将MIFS系统分解成若干分支系统,给出和证明了几个相关定理.然后讨论转移概率矩阵的零元素对吸引子结构的影响,分析吸引子的局部结构特征,发现MIFS系统吸引子包含自相似结构,基于计算机数学实验分析了吸引子分形形成的动力学特性并给予具体的定性描述.