基于模糊熵的改进型PCNN图像分割方法

针对传统的PCNN在图像分割中需要设定大量的参数,并且分割的最佳迭代次数无法自动确定等问题,简化了传统PCNN模型的接受部分,改进了PCNN的连接部分,改变了PCNN的阈值衰减方式,并利用最大模糊熵作为最佳分割迭代次数的判定准则,提出了一种新的PCNN改进模型,从而实现了PCNN的自动精确分割.对各类图像的实验结果表明,该方法能够自动确定循环迭代次数和自动选取最佳阈值,与基于最大香农熵的PCNN分割方法相比,该方法具有收敛速度快、分割精度高、分割效果好等特点.     

一种基于矢量PCNN的彩色图像自动分割算法

为了对彩色图像实施自动分割,在彩色图像RGB空间中,对传统PCNN模型进行了改进与推广,提出一种基于指数熵矢量脉冲耦合神经网络(VPCNN)彩色图像自动分割新算法。该方法在考虑VPCNN互联矢量神经元动态时空相似特性的同时,利用改进指数动态阈值矢量与神经元内部活动项矢量间的信息对比关系确定分割图像的目标和背景区域,结合最大指数熵判据来达到彩色图像的自动分割,并与最大香农熵准则VPCNN分割方法做了比较。实验结果表明:算法具有图像分割精度高、适应性强、能较好地保持彩色图像边缘和细节等信息的优点。     

结合最大方差比准则和PCNN模型的图像分割

脉冲耦合神经网络（PCNN）模型在图像分割方面有着很好的应用。在各项参数确定的情况下,其分割结果的好坏取决于循环迭代次数的多少,而PCNN模型自身无法实现迭代次数的自动判定。为此提出一种结合最大方差比准则的PCNN迭代次数自动判定算法,用于实现图像的自动分割。算法利用最大方差比准则找到图像的最优分割界限,确定PCNN的迭代次数,获得最优图像分割结果,然后利用最大香农熵准则验证分割结果。实验表明：提出的算法实现了PCNN迭代次数的自动判定,提高了PCNN的迭代速度,运行效率优于基于2D-OTSU和基于交叉熵的自动分割算法,图像分割效果良好。     

基于点火频率的PCNN灰度图像分割方法研究

提出了基于点火频率的PCNN灰度图像分割方法,利用熵的变化量作为收敛判据,实现了PCNN神经网络的灰度图像自动分割。     

Unit-Linking PCNN和图像熵的彩色图像分割与边缘检测

在RGB空间中,将最大香农熵准则和最小交叉熵准则两种评价准则与大概率合并和小概率合并两种合并策略相结合,提出基于Unit-Linking PCNN的四种彩色图像分割方案,并在各分量分割结果基础上利用Unit-Linking PCNN实施边缘检测,合并得到彩色图像的边缘检测结果。分析了各评价准则和合并策略的优劣,比较了各分割方案条件下的图像分割和边缘检测效果。与HSV空间中得到的相关结果进行分析比较,该文分割和边缘检测结果体现了图像的更多的细节,说明了在RGB空间中进行彩色图像分割和边缘检测的合理性。与相关文献结果相比,该方法的模型参数对图像分割结果的影响较不敏感。计算机仿真结果表明,该方法具有较好的彩色图像分割和边缘检测效果,具有较强适用性。     

基于并行点火PCNN模型的图像分割新方法

提出一种并行点火脉冲耦合神经网络(Parallelized firing pulse coupled neural networks, PFPCNN)模型的图像分割方法. 首先用改进的Unit-linking PCNN (ULPCNN)模型对图像进行增强, 便于后续的图像分割. 然后采用PFPCNN新模型对增强后的图像进行分割, 最后用最大香农熵方法判定最佳分割结果. 各种复杂场景下的仿真实验及定量评价表明, 本文提出的图像分割方法, 其效果明显优于常规的PCNN分割方法.     

基于微粒群算法和脉冲耦合神经网络的图像分割算法

脉冲耦合神经网络（Pulse Coded Neural Network,PCNN）在图像处理中得到了十分广泛的应用,但是其多个参数的设置给实际应用造成很大的困难。尤其是在图像分割中,不同类型的图像要求不同的分割参数,不同的参数对图像分割的结果影响很大。而微粒群优化算法（Partide Swarm Optimization,PSO）具有对参数自动寻优的优势,为此,将PSO和PCNN相结合,以改进的最大熵函数为适应度函数,提出了一种基于PSO和PCNN算法的图像自动分割算法。实验仿真结果验证了该方法的有效性,即不仅可以正确地实现图像分割,而且参数可以自动设置,省去了人工实验的麻烦,同时分割速度也有所提高。     

一种优化脉冲耦合神经网络模型及在图像分割中的应用

针对目前脉冲耦合神经网络(PCNN)神经元模型参数主要通过人工设定问题,以简化参数为目的将PCNN模型的调制参数β与连接权矩阵K简化为链接系数矩阵W,提出一种优化PCNN神经元模型。该模型应用于图像分割时,充分利用图像本身空间和灰度特性自动确定链接系数,实现对图像的有效分割。实验结果表明,所提方法可以有效对图像进行自动分割,其分割效果优于Otsu方法、人工调整PCNN参数方法。     

基于交叉视觉皮质模型的彩色图像自动分割方法

通过对传统彩色图像分割方法的分析,结合最新的交叉视觉皮质模型,给出了一种新的彩色图像自动分割算法。将图像转换到HSV色彩空间,并利用判决机制选择熵最大的分量进行分割,与传统的对H,S,V分别进行处理并将处理结果合并作为分割结果的方法相比,传统HSV方法耗时7533 s,该算法整个处理过程耗时257 s,约为传统HSV方法耗时的三分之一,大大提高了处理的速度;将最大类间交叉熵判决机制引入到交叉视觉皮质模型中,从而实现图像自动分割,避免了人为干预,提高了分割的准确性。将该方法与基于最大香农熵的分割方法进行了比较,仿真结果表明,该算法对于彩色图像自动分割具有良好的性能。     

基于微分进化的PCNN图像分割方法

脉冲耦合神经网络(PCNN)是一种新型神经网络,可以应用于图像分割。然而在对PCNN的研究应用中,其模型参数的合理确定是个难点,这在很大程度上限制了PCNN的应用。针对这一问题,提出一种基于微分进化的PCNN图像分割方法。该方法使用微分进化算法来实现脉冲耦合神经网络参数的自动设定,并通过将其应用于图像分割,将分割结果与其他优秀分割方法比较,从而验证了该方案的正确性与可行性。     

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.     

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