基于泡沫图像特征的浮选槽液位智能优化设定方法

浮选生产过程中浮选槽液位通常根据经验人工设定,具有主观随意性﹑液位波动大,使精/尾矿品位不满足要求.为此,提出一种基于浮选泡沫图像多特征的浮选槽液位智能优化设定的方法.在浮选槽工作原理以及液位与泡沫图像特征间关系的分析基础上,将基于案例推理的浮选槽液位预设定﹑基于多泡沫图像特征的改进LS-SVM（Least squares support vector machine）品位预测及基于BP神经网络的自学习模糊推理智能补偿等模型有机集成,提出了充分利用泡沫图像特征的液位智能优化设定方法.将该方法在某铝土矿浮选生产过程进行应用验证,可使粗选槽液位波动减小,提高了粗选精/尾矿品位合格率、总精矿品位合格率及回收率.     

基于纹理单元分布的硫浮选过程病态工况检测

针对硫浮选过程难以及时发现病态工况的问题,提出一种基于泡沫图像纹理单元分布函数的硫浮选过程病态工况检测方法。通过计算纹理单元值提取泡沫图像的纹理特征,避免传统灰度共生矩难以准确描述纹理特征的问题,设计核函数估计算法逼近泡沫纹理单元概率密度函数(PDF),使得纹理单元分布函数转化成一组动态权系数。建立基于纹理单元分布动态权系数的主元模型,并基于该模型的T2统计量得到检测阈值,从而实现硫浮选过程病态工况的及时检测。湿法炼锌直接浸出硫浮选工段现场运行结果表明此算法的有效性。     

浮选浆位仪的设计与应用

针对目前许多液位检测仪器都不能正确测量浮选机内浆体的液位这一问题,研制了浮选浆位仪,它采用导电率法,根据煤浆、矿化泡沫层和空气的导电率不同,得到了三种介质的相界面,从而求得浮选煤浆的液面和泡沫层的厚度。基于浮选浆位仪设计的浮选测控系统,实现了浮选过程的优化控制,通过在淮北选煤厂的现场使用表明,浮选浆位仪能适应浮选生产环境,并能有效地测量浮选机内的浆位;同时浮选控制系统根据其测量结果,对浮选过程进行反馈控制;使浮选生产获得了较高的精煤产率,并降低了浮选药剂用量。     

基于机器视觉的矿物浮选过程监控技术研究进展

矿物浮选流程长、分布范围广、控制变量多、关键工艺参数无法在线检测,导致实时监控困难, 严重制约了浮选生产的优化运行及选矿自动化水平的提升.浮选泡沫表面视觉特征是浮选工况和工艺指标的直接指示器, 为此将机器视觉应用到矿物浮选过程的监控中, 以提高浮选过程的资源回收率. 本文结合矿物浮选泡沫图像特点,从浮选过程的泡沫图像关键特征提取及表征、关键工艺参数检测、工况识别以及基于机器视觉监控系统的实现等方面综述了浮选过程监控技术的研究成果,并 指出了基于机器视觉的选矿过程监控技术的发展趋势及面临的挑战.     

基于机器视觉的矿物浮选pH软测量方法

针对泡沫浮选过程中人工检测矿浆pH值严重滞后以及pH检测仪电极容易积垢导致测量不准等问题,提出基于机器视觉的浮选矿浆pH软测量方法。确定了与矿浆pH值最相关的图像特征泡沫颜色、尺寸和流速;采用减法聚类确定模糊系统的初始结构,并选择变尺度分级混沌方法优化隶属函数和输出权值,最终建立模糊神经网络pH软测量模型。工业实践证明应用该模型在线检测浮选矿浆pH值的可行性。     

数据驱动的锑粗选泡沫图像特征优化设定

针对锑浮选过程中精、尾矿品位难以在线检测, 浮选性能不稳定的问题, 提出一种数据驱动的泡沫图像特征优化设定方法. 该方法根据入矿品位类型对泡沫图像特征进行优化设定, 并针对不同入矿品位类型的样本分布特点,先尝试采用案例推理的方法从历史数据中寻找浮选性能优良的泡沫状态. 若经验知识不足, 则采用基于多中心模糊C均值聚类与概率支持向量回归的区间II 型模糊系统建模方法建立精、尾矿品位指标模型, 并在此基础上利用智能优化方法寻优泡沫图像特征值. 某锑浮选工业实验结果表明了所提出方法的有效性.

     

基于输出PDF的浮选故障检测和诊断方法

针对浮选中泡沫尺寸分布的特殊性,如非高斯分布,左偏斜,高峰值等,常规分析方法无法准确描述尺寸分布的特点,因此无法准确检测和诊断浮选过程中出现的故障。提出对泡沫尺寸分布的输出概率密度函数(PDF)的统计分析,形成了一种新的浮选过程故障检测和诊断方法。通过采用自设计的核方法逼近将输出PDF转化为动态权系数,建立带有时滞的非线性不确定性权动态模型,基于线性矩阵不等式设计得到可行的故障检测和诊断算法。通过仿真验证分析,证明此算法的有效性。结合现场浮选过程,讨论了此方法的应用前景和优势。     

基于云PSO 的RVM入侵检测

入侵检测可为计算机网络信息提供安全保障,在其方法研究中,由于相关向量机(RVM)具有高稀疏性且预测中使用概率因素,在网络入侵检测中优于支持向量机.然而RVM的核函数参数是经验估计的,为此,提出一种基于云模型的粒子群优化算法的RVM方法,即采用云粒子群算法确定RVM的核参数,构建RVM分类模型,再采用一对一分类方法进行多类检测分类.经入侵检测实验研究,所得结果表明所提出的方法优于基于常规相关向量机的检测方法,且具有更高的入侵检测精度.     

泡沫图像处理技术在矿物浮选作业中的应用

结合云南省院省校合作项目浮选泡沫层测控系统开发及产业化研发过程,介绍一种基于数字图像处理及识别技术的浮选过程控制新思路。在浮选生产中,浮选泡沫表面纹理与浮选工况密切相关,直接反映泡沫层的矿化程度（品位高低）。通过对云南某铅锌矿选厂浮选泡沫图像的分析处理,提取出能够表示泡沫层特征的参数,达到间接测量气泡的大小、纹理、稳定性、流动性等泡沫层特征状况。采用邻域灰度相关矩阵法提取特征参数,然后用神经网络进行分类,给出浮选效果的分类判断。     

基于尺度不变特征变换的浮选泡沫图像动态特性提取方法

本文以矿物浮选过程为背景,针对浮选泡沫不断运动变化导致泡沫图像动态特性难以提取的问题,提出一种基于尺度不变特征变换(scale invariant feature transform,SIFT)浮选泡沫图像动态特性提取方法.首先,依据浮选泡沫独特的运动特性,提出运动匹配区间的概念,然后依据泡沫速度大小和方向对应分布范围改进SIFT算法匹配条件,在此基础上应用基于速率随机抽样一致(RANSAC)算法进一步剔除误匹配点,最后,根据匹配结果提出一种泡沫崩塌率提取方法.采用浮选现场实际泡沫图像进行验证,实验结果表明本文所提方法能够准确提取浮选泡沫速率、崩塌率等动态特性,有效剔除误匹配,同时降低了计算复杂度,提高了计算实时性.     

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