面向制造业的供需链管理集成框架研究

由于经济和技术的发展,供需链间的竞争趋于激烈并将成为21世纪的主要竞争形式。企业间的信息共享和敏捷供需链的快速动态重组,都对供需链系统分布、异构的特性提出了特殊要求。本文基于代理的思想,采用WEB和CORBA技术,设计了一个市场驱动的通用的供需链集成平台,并完成了8个代理设计,节点企业在获得授权后在对象模型的基础上遵循CORBA规范对其Legacy系统进行封装形成适配器,便可加入和退出供需链。     

基于核心功能结构的敏捷供需链管理与优化

为提高企业对市场需求的快速响应,提出基于核心功能结构(Critical Function Structure,CFS)的敏捷供需链系统模型.针对市场需求的不确定性,重点研究敏捷供需链的管理及其优化方法,在此基础上提出基于网络的敏捷供需链管理与优化体系结构,进一步增强整个供需链的敏捷性和管理优化决策的准确性和预见性,提高整个供需链的效率和竞争力.     

供需链协同的定量评价

供需链协同是供需链系统在某种契约或合作机制下,在各成员企业个体利益满意的前提下达到整体利益最大化的状态.供需链系统并不是在任意合作机制下都可以达到协同状态.为评价供需链系统的协同程度,引入供需链协同度的概念及其计算方法,并通过理论分析和数值仿真结果,验证了其有效性.供需链协同度指标不仅反映供需链系统运作的资源利用率,也为改进契约设计、提高供需链系统的协同性能提供了数量依据.     

基于协同模式的敏捷供需链管理系统优化

敏捷供应链管理是现代企业十分关注的问题,建立良好的敏捷供需链管理系统是实现敏捷供需链管理的重要保证。本文提出了协同管理模式下敏捷供需链系统模型,并研究了该模式下敏捷供需链管理及优化方法,在此基础上提出了敏捷供需链管理系统的体系结构。为增强供需链在国际市场中的竞争力提供了一条可行性途径。     

非对称信息下供需链企业间的回购策略分析

回购策略是解决因信息结构的非对称和决策激励的不一致所导致的供需链低效的一种协调机制。本文以一个两阶段的供需链系统为背景，研究了上游供应商在下游零售商的零售价为私有信息的情况下，供应商实施线性回购策略和非线性回购策略的优化方案。研究表明，线性回购策略不能保证系统高效，非线性回购策略无法自动执行。最后通过仿真，验证了结果。     

供需链仿真技术的发展现状与趋势

介绍了供需链仿真技术的发展现状和趋势，给出了供需链仿真的概念和主要内容。根据构成系统仿真的三个基本活动，依次介绍了供需链仿真中的系统建模技术、仿真建模技术以及仿真系统的实现技术。总结了目前供需链仿真技术的应用现状．并分析了目前供需链仿真技术的特点和存在的问题，探讨了未来的发展趋势。     

面向供需链协同的信息共享价值分配机制

为实现供需链协同,合理设计信息共享价值分配机制,针对由一个制造商、多个同质分销商、多个同质零售商所组成的三级供需链系统,从库存持有水平的角度定量分析各成员的信息共享价值.在此基础上,应用多人合作博弈理论,建立了供需链库存效益分配模型,并采用τ值法求解该模型,给出了满意、协调、协同等多种分配方案.数值实验结果表明,基于τ值法的协同分配方案能够促使供需链协同的实现.     

有时间窗的车辆路径问题的近似算法研究

为了分析不确定性因素对敏捷供需链系统的影响,文章从敏捷供需链系统重构的可能性条件和快速响应特征出发,根据敏捷供需链的运行目标,建立了基于风险因子的敏捷供需链系统风险分析模型,将敏捷供需链的不确定性因素分为系统层、协作层和实体层进行分析;以系统各层评价指标变化为风险分析的最终结果,给出一种针对敏捷供需链系统的风险进行定性与定量相结合的方法和分析流程。最后对该风险量化建模和定量分析方法进行举例验证,风险分析结果能够有助于为敏捷供需链系统的决策层提供决策依据,证明了该风险量化建模和定量分析方法适用于敏捷供需链系统的风险管理。     

敏捷供需链管理系统实现方案的探讨

敏捷供需链管理系统的实现,需要结合分布式对象技术、网络技术以及人工智能技术。本文讨论了这些技术在实现过程中所扮演的角色和应当达到的目标,在此基础上,提出了敏捷供需链管理系统实现框架,并进一步详细讨论了供需链计划与调内核的实现方案;原有信息系统封装的实现方案,以及运用业务对象构件体系结构和对象数据库实现敏捷供需链管理系统执行系统的优化方案,并分析了实现过程所涉及的技术要点。     

敏捷供需链计划与协调系统的设计与实现

在敏捷供需链管理系统中,为了达到以最低的成本、最高的质量满足客户比性化需求的目标,必须面向订单、快速制定最优的订单执行计划,并保证计划的可行性。敏捷供需链中的计划需要考虑多种资源,需要多个独立,分布的实体之间的合作与协调。计划与协调是敏捷供需链管理的基础,多代理系统是实现敏捷供需链计划与协调系统的有效方案,本文提出了一个二级敏捷供需链计划与协高机制,并给出了基于多代理的计划与协调系统的设计与实现。实践证明,该方案将极大地增加企业的敏捷性,提高企业在竞争、合作,动态环境的竞争能力。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.