Algorithm for solving the bi-level decision making problem with continuous variables in the upper level based on genetic algorithm     

肖剑 《重庆大学学报(英文版)》2005,4(1):59-62

1 Introduction a The bi-level decision-making is a complex majorized problem. Its effective solution is not easy to obtain by traditional majorized methods. Reported methods to solve the bi-level decision making problem with continuous variables include neural network [1], Monte Carlo simulated annealing algorithm [2], etc. However, the efficiency and accuracy of such neural network methods are ideal and accompanied with a long iterative time and a slow convergence speed. In this paper, the …  相似文献   

实现文件路由Pastry算法的研究     

刘兰  林军 《广东技术师范学院学报》2008,(6)

结构化P2P系统的特点是文件的发布和网络拓扑紧密相关。文件按照P2P拓扑中的逻辑地址精确的分布在网络中。其中实现文件路由的算法有多种,本文着重分析其中的Pas t r y算法,就其工作原理和应用范围进行探讨。  相似文献   

多约束QoS路由算法综述     

李敏  陆芸婷 《深圳信息职业技术学院学报》2008,6(2):71-76

保证服务质量的QoS路由（Quality of Service Routing）是网络中解决QoS问题的一项关键技术。QoS路由的主要目标是为接入的业务选择满足服务质量要求的传输路径,同时保证整个网络资源的有效利用。度量参数选择问题、寻路问题和路由信息不准确问题是QoS路由中的几个主要研究内容。多约束QoS路由算法通常是NPC问题,本文先对QoS路由中的问题进行分娄,再对当前研究的一些多约束QoS路由算法进行了归纳与分析。这些算法对于在Internet中实现QoS有着重要的指导意义。  相似文献   

From Informal Strategies to Structured Procedures: mind the gap!     

Julia Anghileri  Meindert Beishuizen  Kees van Putten 《Educational Studies in Mathematics》2002,49(2):149-170

This paper explores written calculation methods for division used by pupils in England (n = 276) and the Netherlands (n = 259) at two points in the same school year. Informal strategies are analysed and progression identified towards more structured procedures that result from different teaching approaches. Comparison of the methods used by year 5 (Group 6) pupils in the two countries shows greater success in the Dutch approach, which is based on careful progression from informal strategies to more structured and efficient procedures. This success is particularly not able for the girls in the sample. For the English pupils, whose written solutions largely involved the traditional algorithm, the discontinuity between the formal computation procedure and informal solution strategies presents difficulties.This revised version was published online in September 2005 with corrections to the Cover Date.  相似文献   

Decoding Reed-Solomon codes using Euclid’s algorithm     

Priti Shankar 《Resonance》2007,12(4):37-51

Reed-Solomon codes are indeed an elegant illustration of a very practical application of abstract algebra. An interesting discovery was the fact that Euclid’s algorithm for finding greatest common divisors of polynomials, could be used for decoding these codes. In this article we explain this connection. Priti Shankar is with the Department of Computer Science and Automation at the Indian Institute of Science, Bangalore. Her interests are in theoretical computer science and error correcting codes.  相似文献   

Introducing Secondary Education Students to Algorithms and Programming     

Vassilios Dagdilelis  Maya Satratzemi  Georgios Evangelidis 《Education and Information Technologies》2004,9(2):159-173

In Greece, the development of the teaching of Information Technology (IT) in schools has been greatly influenced by the rapid development of technology, making IT literacy a priority for all individuals. Consequently, the teaching of algorithms and programming, with the ulterior motive of teaching modeling as well as problem solving, has been greatly limited in Secondary Education. However, we strongly believe that algorithms and programming constitute an important intellectual tool and should be included in basic education. In any case, both the research literature findings, as well as, our own experience confirm the fact that novice programmers come up against many mental obstacles in their attempts to understand the functioning of programs or the construction of algorithms. In order to deal with these difficulties and successfully teach the elementary concepts of algorithms and programming, we have developed didactic scenarios, which are based on specially designed educational software. In conjunction with this, we are attempting to develop a program for the systematic training of those students who will become IT teachers in Secondary or Primary Education. The most significant findings of our research are summarized as follows: (a) The development of educational software and its experimental use in the teaching process allow us to formulate several general rules related to the specific didactic characteristics, which these environments should include. (b) Educational software is effective only when it is incorporated within the framework of the didactic scenarios that the teacher organizes and which are supported by the software. (c) Teachers do not spontaneously use educational software in the context of this rationale. Therefore, specific training is required so that they adopt and use such software in didactic scenarios.  相似文献   

变压器分层绕组模型变焦遗传算法的参数辨识     

卢小芬 《泉州师范学院学报》2005,23(4):24-29

电力变压器分段绕组的传递函数模型可用来实现局部放电的精确定位，受制于测量条件，其模型参数辨识较为困难，文章应用遗传算法来解决电力变压器分段绕组模型参数辨识的问题，在绕组套管上施加一脉冲信号，通过在接地端测量其响应，在分段绕组的RLC数学模型基础上，假定分段绕组各单元的绕组之间绝缘损耗RS，对地电阻Rg，线圈之间电容Cs，线圈对地电容Cg，绕组损耗R和漏抗L相等，分段绕组之间的互感M通过一个电流控制的电压源模拟，对变压器分段绕组数学模型的参数进行辨识，同时进一步研究了参数变化范围对辨识结果的影响，引入变焦算子大搜索范围与辨识精度之间的矛盾，辨识结果表明，该方法是可行的。  相似文献   

题库管理中一种简捷随机抽题算法和源程序   总被引：1，自引：0，他引：1  

易德成 《株洲师范高等专科学校学报》2006,11(2):57-59,63

介绍利用VFP语言设计试题库的方案．探索了针对题库进行随机抽题的一种简明算法，该算法充分利用VFP已有的标准函数和数组的功能，构造了一个能生成没有重复题号的用户自定义函数DERAND（），并根据此函数形成的题号，用VFP语言设计一个随机组卷的源程序．  相似文献   

Number sense strategies used by 6th‐grade students in Taiwan     

Der‐Ching Yang 《Educational studies》2005,31(3):317-333

In an interview setting, 21 6th‐graders from four public schools in south Taiwan were asked a series of questions, related to whole and decimal numbers, designed to assess their number sense. Eight students were randomly selected from both low and middle performance levels, and five were selected from a high‐performance level, according to their mathematical capabilities. Results indicated that, regardless of performance level, very few number sense strategies (e.g. using benchmarks, estimation or numbers of magnitude) were used. The evidence also revealed that Taiwanese students tended to apply rule‐based methods and standard written algorithms to explain their reasoning. Their inclination to use paper‐and‐pencil procedures narrowed their thinking and reasoning powers: this heavy reliance on written algorithms seemed to be a major impediment to the development of number sense.  相似文献   

遗传算法在试题组卷中的应用研究     

俞益飞  王训杰 《江西蓝天学院学报》2006,(4)

组卷问题是一种多重约束目标的问题求解,为此我们设计了一个求解该问题的遗传算法,提出了独立编码和针对该编码的组内交叉算子、组内变异算子。  相似文献