基于神经网络智能预测武昌阅马场隧道交通流

首先在对城市公路隧道的宏观动态交通流模型进行分析,然后以神经网络建立城市公路隧道的宏观交通流的智能模型,并利用该神经网络模型实现对武昌阅马场隧道交通系统的智能监控.     

城市高速公路交通的神经网络建模与控制

从城市高速公路交通流的宏观、动态特性出发 ,分析了交通流控制中常用的宏观、动态、确定性模型 在此基础上 ,利用人工神经网络技术建立了城市高速公路的神经网络模型 ,并提出了入口匝道放行和路段速度相结合的多变量神经网络控制策略 利用该控制策略建立的自适应神经网络控制器 ,可以使高速公路上的交通密度维持在理想的密度值附近 .进一步分析可以得到 ,该控制器是一个状态和控制作用均可跟踪的伺服系统 .以杭州某高架高速公路为背景的仿真结果表明 :该控制器具有较强的鲁帮性 ,控制效果令人满意 .     

城市短时交通流预测仿真研究

应用灰色系统和神经网络研究城市短时交通流预测问题。针对目前交通流预测方法难以处理城市短时交通流实时变化以及高度非线性特征,导致实际预测精度差的缺陷,提出了一种基于灰色系统和神经网络的组合模型,利用灰色模型对实际监测到的数据进行拟合、预测。得到预测值和预测残差。将预测残差输入到神经网络模型进行残差的学习、仿真和预测,残差预测值和GM(1,1)模型预测值的和值作为最终预测结果。运用组合模型方法对贵阳喷水池路段交通流量进行预测,实验结果证明了组合方法的有效性、可行性。     

广义神经网络的研究及其在交通流预测中的应用

提出一种基于线性独立函数的智能神经元模型,理论分析表明这种智能神经元比普通神经元具有更高的知识存储能力,可使整个神经网络的信息处理能力得到大大增强.将这种智能神经元组成的广义神经网络应用于交通流预测,对大连市实测交通流数据进行了预测分析.实验结果表明,该广义神经网络的预测效果远远优于常规BP网络,具有较高的实用价值.     

高速公路动态交通流的BP神经网络建模

通过对高速公路宏观动态交通流模型的分析,针对高速公路交通系统的非线性时变特点,应用BP神经网络建立了高速公路宏观动态交通流模型。并利用一段高速公路的交通流数据对BP神经网络进行训练,得到网络参数。最后,为了验证BP网络模型的有效性,在MATLAB环境中对模型进行了仿真,并将仿真结果与原始模型的结果进行了比较。结果表明,该方法能较准确地描述高速公路交通流的真实行为,并且能够适应交通状况的变化。     

经GA优化的WNN在交通流预测中的应用

针对城市交通流的复杂性、随机性、非线性等特点,利用遗传算法(GA)优化小波神经网络(WNN),以克服传统神经网络收敛速度慢、易陷入局部最小点等缺陷,在此基础上建立基于GA-WNN的城市交通流预测模型。利用GA-WNN、GA-BP和WNN模型对南昌市南京西路交通流进行仿真预测,实验结果表明,GA-WNN模型的预测效果较好,相比GA-BP和WNN模型具有更高的预测精度和更快的收敛速度。     

基于元胞自动机的中尺度交通模拟——以徐州市为例

元胞自动机应用于微观交通系统分析已经相对成熟,但将元胞自动机与城市整体范围内交通系统结合进行分析还少有研究。从中尺度上利用元胞自动机思想在城市整体范围内对交通流模拟进行探讨,从而希望为城市交通流的模拟分析提供一个新的研究思路。该研究通过分析对交通量产生影响的土地单元利用属性提出了车辆生成灭失模型,并列举阐述了模型的相关属性。然后建立了车辆引力度模型确定车辆的行驶路线,以及详细提出和建立了车辆行驶模型等。最后利用基于以上模型编制的程序系统模拟徐州市主要道路交通流状况,在模拟城市交通流的同时对模型系统模拟的真实性进行了分析。     

基于元胞自动机的中尺度交通模拟——以徐州市为例

元胞自动机应用于微观交通系统分析已经相对成熟,但将元胞自动机与城市整体范嗣内交通系统结合进行分析还少有研究.从中尺度上利用元胞自动机思想在城市整体范围内对交通流模拟进行探讨,从而希望为城市交通流的模拟分析提供一个新的研究思路.该研究通过分析对交通量产生影响的土地单元利用属性提出了车辆生成灭失模型,并列举阐述了模型的相关属性.然后建立了车辆引力度模型确定车辆的行驶路线,以及详细提出和建立了车辆行驶模型等.最后利用基于以上模型编制的程序系统模拟徐州市主要道路交通流状况,在模拟城市交通流的同时对模型系统模拟的真实性进行了分析.     

基于LSTM-BP组合模型的短时交通流预测

为减轻日益严重的交通拥堵问题,实现智能交通管控,给交通流诱导和交通出行提供准确实时的交通流预测数据,设计了基于长短时记忆神经网络（LSTM）和BP神经网络结合的LSTM-BP组合模型算法.挖掘已知交通流数据的特征因子,建立时间序列预测模型框架,借助Matlab完成从数据的处理到模型的仿真,实现基于LSTM-BP的短时交通流精确预测.通过与LSTM\BP\WNN三种预测网络模型的对比,结果表明LSTM-BP预测的时间序列具有较高的精度和稳定性.该模型的搭建,可对交通分布的预测、交通方式的划分、实时交通流的分配提供依据和参考.     

BP神经网络短时交通流预测模型研究

通过对比分析短时交通流预测模型,本文对BP神经网络的基本原理进行了分析,对BP神经网络算法进行设计,建立了基于BP神经网络的短时交通流预测模型。同时将其应用于短时交通流预测模型的仿真计算,利用某市路口的实测交通流数据来验证模型的可行性。仿真结果表明,BP神经网络算法具有较快的计算速度与较好的适应能力,该方法可以较好地应用于短时交通流预测。     

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.     

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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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