求解0-1规划问题的DNA计算模型(英文)

DNA计算是以DNA分子作为数据的一种新型计算模式．在DNA计算中首要面对的问题是编码问题．文中提出了一种双编码方法,利用这种编码方法可以使得在DNA计算的读解过程类似于DNA测序过程,容易实现自动化操作．基于该编码方法所建立的DNA计算模型可用于求解0-1规划问题,只需4次PCR反应即可读取问题的可行解．与其他DNA计算模型相比,该模型具有操作简单、易于实现的优点．     

DNA折纸术在0-1背包问题中的应用

DNA折纸术因其反应的可编程性、纳米可寻址性等优点被广泛地应用于DNA计算中。利用DNA折纸术和杂交链式反应构建0-1背包问题的计算模型。以四个变量的0-1背包问题为例,首先将九种发夹结构和一种分子信标锚定在DNA折纸基底上并加入足量的辅助链;其次通过加入不同的引发链可以触发不同路径上的杂交链式反应,并得到问题的所有可能解;最后,通过荧光信号的数量确定可行解,从而找到问题的最优解。该模型不受权重过大或过小的影响,在折纸基底上可等比例的缩放权重。用Visual DSD软件对该模型进行仿真,模型显示出良好的可行性。     

基于网格的远程考试系统模型的设计与研究

分析了目前考试系统面临的主要问题,介绍了网格的概念及其特性,提出了基于网格的远程考试系统模型(GTM),讨论了GTM的设计思想、结构、功能及实现方法,阐述了GTM存在的问题及发展趋势。     

基于网格的远程考试系统模型的设计与研究

分析了目前考试系统面临的主要问题，介绍了网格的概念及其特性，提出了基于网格的远程考试系统模型（GTM）．讨论了GTM的设计思想、结构、功能及实现方法，阐述了GTM存在的问题度发展趋势。     

基于多级抽取的0-1整数规划问题的DNA算法

DNA计算是一种借助于分子生物技术进行计算的新方法,在解决一类困难问题特别是NP-完全问题上具有硅计算机无法比拟的优势,利用DNA计算求解0-1整数规划问题的研究具有重大的意义.基于多级分离模型解决0-1整数规划问题,且给出DNA算法.通过一个实例给出了操作的步骤.     

移动社会网络中基于全局信任模型的用户影响力计算

针对现有算法和模型对于网络中用户影响力计算大多只考虑拓扑结构和贪心算法而较少考虑真实社会网络中信任度对于节点影响力的重要性这一问题, 该文提出一种全局信任模型(global trust model, GTM)用于评估节点的影响力. 首先计算节点与邻居节点间的信任关系作为局部信任度, 其次利用Beta信誉模型在节点局部信...     

基于N进制的DNA并行加法与乘法模型

现有DNA数值计算模型大多在二进制基础上进行计算,通用性不强。针对该问题,设计基于N进制的DNA自装配并行加法与乘法模型。在Labean模型的基础上,加法模型通过改进库分子的编码方式将DNA算法的时间复杂度降为O(1),空间复杂度降为O(n);乘法模型在解决一位数连加问题后,转换为相应的加法模型进行计算。实验结果表明,该并行模型编码简单,具有较低的时间复杂度和空间复杂度。     

基于环形DNA分子的一种求解最大集团的计算模型

文中提出了一种基于环形DNA分子的新型计算模型.该模型的核心构成包括环形DNA分子,链霉亲和素包被的磁珠及环化酶.通过应用该模型解决了一个5个顶点的最大团问题,证明了该模型的可行性.在整个计算过程中,真解的搜索是借助于磁珠和环化酶,DNA分子结构在线性和环形之间相互转化.环形DNA分子的应用极大地减少了计算所需的时间和空间,算法的时间和空间复杂度均为O(n+m).对于解决一个n个节点的最大团问题,这种算法和枚举型算法相比,在搜索过程中所需试管数较少,只需n+1个试管,而利用枚举型算法则需要2n个试管.另外,文中构建的非枚举型初始解空间大大提高了DNA计算机的存储和计算能力.在将来,这种新型的DNA计算模型或许会成为一种解决某些NP完全问题的有效工具.     

一种高效的百万富翁问题协议及其应用

百万富翁问题是安全多方计算的基础问题,但现有解决方案计算复杂度高且效率较低,在两数相等时无法进行精确比较。针对该问题,提出一种基于0-1编码的百万富翁问题协议。使用改进的0-1保密数据编码规则构建向量,利用ElGamal同态加密变体算法的同态性质,将百万富翁问题转化为向量中两元素求和的问题,同时在半诚实模型下利用模拟范例证明协议的正确性与安全性,并将其应用于安全两方集合交集个数问题的求解。实验结果表明,与采用ElGamal和Paillier同态加密算法的协议相比,该协议计算复杂度更低且效率更高,可在两数相等时进行准确对比。     

并行模式下分子散射模型的求解

串行模式下,求解复杂电子分子碰撞的散射问题存在单机处理时间长、内存耗用大等缺陷,而并行处理的思想可显著降低其计算时间,是解决该问题的有效途径。在主-从结构的并行模型基础之上设计并实现了电子分子碰撞散射的并行算法,提出了有效的优化步骤。实验结果得到了满意的加速比和并行效率,验证了该方案的可行性与正确性。     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

基于AD9626的模拟信号采集存储卡设计

自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。     

A human-computer interface for non-computer specialists

The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users.     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

Call for papers Special issue on Modeling and control technologies for civil,energy,and power systems

正The control of civil,energy,and power systems presents significant new challenges for modeling and control theory.The purpose of this special issue is to provide a forum for researchers and practical engineers to discuss the recent advances in modeling and control technology development for civil,energy,and power systems.Prospective authors are invited to submit their original contributions with the focus on theory or applications of modeling,control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate and promote academic exchange between Chinese and foreign scientists everywhere.