一种多输出支持向量机的增量学习算法

标准支持向量机主要对单输出样本学习已经进行了广泛的研究,而对多输出样本学习问题的研究较少.在最小二乘支持向量回归机模型的基础上,推广得到多输出最小二乘支持向量回归机模型,并给出它的一种增量学习算法.理论分析和实验结果证明它不但保证了学习精度,而且使得多输出回归问题的学习速度大大加快.     

一类非平坦函数的多核最小二乘支持向量机的鲁棒回归算法

给出了标准最小二乘支持向量机的数学回归模型,并提出了多核最小二乘支持向量机算法,用于提高非平坦函数的回归精度.运用谱系聚类方法解决多核最小二乘支持向量机的解缺乏稀疏性的问题.利用偏最小二乘回归方法对多核最小二乘支持向量机进行了鲁棒回归.通过仿真实例证实了所提方法的有效性.     

基于支持向量回归的单步多分类算法

分析了利用支持向量回归求解多分类问题的思想,提出了一种基于局部密度比权重设置模型的加权最小二乘支持向量回归模型来单步求解多分类问题：该方法先分别对类样本中每类样本利用局部密度比权重设置模型求出每个样本的权重隶属因子,然后运用加权最小二乘支持向量回归算法对所有样本进行训练,获得回归分类器。为验证算法的有效性,对UCI三个标准数据集以及一个随机生成的数据集进行实验,对比了多种单步求解多分类问题的算法,结果表明,提出的模型分类精度高,具有良好的鲁棒性和泛化性能。     

基于相关分析与最小二乘支持向量机的TE过程多模型建模

针对TE化工过程高度非线性、复杂性的特点,文章提出了一种基于相关分析和最小二乘支持向量机对TE过程进行多模型建模方法,以提高模型性能;首先对TE过程采用相关分析法划分为3个子系统,对每个子系统分别采用基于C-均值聚类的最小二乘支持向量机建模和基于K均值聚类的最小二乘支持向量机多模型建模;实验表明,基于K均值聚类的多模型建模能简化计算、提高模型精度、并且能更好的预测模型输出.     

基于灰关联分析的KFCM-LSSVM蒸发过程软测量

针对氧化铝蒸发过程出口浓度在线检测问题,提出一种基于灰色关联分析和核模糊聚类相结合的多支持向量机蒸发过程建模方法.该方法采用灰色关联分析提取影响出口浓度较大的变量,再用核模糊聚类算法将样本划分成不同的子类,并对各子类构建的支持向量机模型的输出综合加权得到最终输出.对蒸发过程生产数据进行实验,并与核模糊聚类最小二乘支持向量机(KFCM-LSSVM)相比较,结果表明新模型鲁棒性较强、精度较高、泛化性更好,可以用于蒸发过程的优化控制.     

基于确定性退火聚类的LSSVM短期负荷预测

提出了确定性退火聚类和最小二乘支持向量机(Least square Support Vectormachine.LSSVM)相结合的电力系统短期负荷预测方法.考虑影响负荷变化的各种因素构造负荷样本数据,利用确定性退火聚类算法对样本数据进行分类,得到的分类样本数据作为最小二乘支持向量机的学习样本,保证最小二乘支持向量机具有较高的预测精度.利用某电力公司2007年负荷数据和气象数据进行仿真实验,仿真结果表明该方法具有较高的预测精度.     

模糊核聚类支持向量机集成模型及应用

为了进一步提高支持向量机在回归预测中的精度,提出一种基于模糊核聚类的最小二乘支持向量机集成方法。该方法采用模糊核聚类算法根据相互独立训练出的多个LS SVM在验证集上的输出对其进行分类,并计算每一类中的所有个体在独立验证集上的泛化误差,然后取其中平均泛化误差最小的个体作为这一类的代表,最后经简单平均法得到集成的最终预测输出。在短期电力负荷预测中的实验结果表明,该方法具有更高的精确度。     

一种支持向量机的快速分类算法

鉴于传统支持向量机分类过程的计算量和支持向量的个数成正比,为了提高分类决策的速度,提出一种约简支持向量的快速分类算法,该算法对原始的支持向量进行特定比例的模糊均值聚类操作,按照分类误差最小的原则构建最小线性二乘回归模型,求解新的支持向量系数和决策函数的偏置.人造数据集和标准数据集上的实验表明,约简50%支持向量后,可以在保持分类精度在无统计意义的明显损失的前提下,使得分类速度提高50%.     

基于聚类的LS-SVM的入侵检测方法研究

本文针对最小二乘法支持向量机在入侵检测中的训练效率低下的缺点,将聚类方法应用其中。该方法主要用来对数据集进行剪枝,有效地减少距离分类面较远的数据集合数量,而使用靠近聚类中心的数据集合作为有效的样本集合,减少样本的训练时间,提高训练效率。实验表明,使用聚类方法提高了最小二乘法支持向量机的训练效率,而且对入侵检测有很好的效果。     

基于确定性退火聚类的LSSVM短期负荷预测

提出了确定性退火聚类和最小二乘支持向量机（Least Square Support Vectorma—chine,LSSVM）相结合的电力系统短期负荷预测方法。考虑影响负荷变化的各种因素构造负荷样本数据,利用确定性退火聚类算法对样本数据进行分类,得到的分类样本数据作为最小二乘支持向量机的学习样本,保证最小二乘支持向量机具有较高的预测精度。利用某电力公司2007年负荷数据和气象数据进行仿真实验,仿真结果表明该方法具有较高的预测精度。     

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.     

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.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

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     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to 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     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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