大规模用户语义描述需求建模与分析

针对大规模用户提交的语义描述需求存在模糊性、不确定性、需求关系复杂等问题,提出一种大规模用户语义描述需求建模与分析方法。在分析语义描述需求形式和类型的基础上,构建需求模型并制定两阶段需求建模过程。首先合成需求,基于感性词语义相似度聚类非参数型需求,基于参数观点对应的梯形模糊数相似度聚类参数型需求,将语义描述需求转化为标准的需求项;然后,采用两轮评估的方法评估需求间的相关关系,并据此修正需求量和计算需求重要度,根据需求重要度识别关键需求,输出用户群体需求方案。以手持吸尘器的大规模用户语义描述需求建模分析过程为例对该方法进行应用研究,证明了方法的可行性。     

CP-PMTT:一个基于控制流模式的过程模型转换工具

目前大多数过程模型转换方法采用基于元类映射的转换规则,鉴于因不同过程建模语言在建模符号和语法约束上的差异,而使基于元类映射的转换规则在应对过程模型转换时存在明显局限,提出一种基于控制流模式的过程模型转换框架,转换框架包括一个支持用户自定义控制流模式的控制流模式定义框架,控制流模式定义框架是转换框架的转换核心。通过建立源语言、目标语言和转换核心的映射关系,生成源语言到目标语言的转换规则。基于上述框架实现了一个过程模型转换工具。通过业务流程建模标记到另一种工作流语言的转换场景,对转换工具进行了验证。     

基于用户需求分类的同步多产品设计方法

针对模糊聚类分析法在大规模定制中处理用户需求时,忽略用户需求与产品质量特性之间联系的问题,提出了基于Kano模型用户需求分类的同步多产品设计方法.通过Kano模型对用户需求进行分类,将用户需求按不同需求类别和需求权重重组成多类具有不同功能属性的产品需求组,再利用质量功能展开来实现用户需求的转换,使产品设计过程从需求空间向设计空间映射,实现同时对多类产品进行设计.以洗衣机的产品设计实例演示了该设计方法.     

型号研制过程的工艺分工规划建模技术研究

在完善工艺分工规划概念和详细分析工艺分工规划的业务流程的基础上,针对工艺分工规划过程建模问题,提出了一种基于映射分解的过程建模方法,并逐步建立了工艺分工规划的映射模型、信息模型和通用的工艺分工规划过程模型.然后,结合实际项目,建立了基于工艺分工规划过程模型的系统框架,并开发了一个原型系统,以验证该过程模型的可行性.     

基于聚类动态LS-SVM的L-赖氨酸发酵过程软测量方法

针对生化反应过程中软测量模型存在的模型失效问题,提出了一种基于模糊C均值聚类(FCM)和动态LS-SVM的混合建模方法.首先,采用FCM算法将训练集分成具有不同聚类中心的子集,然后对每一类分别采用LS-SVM进行训练并建立子模型.对于带有新信息的样本数据首先计算其对每一类的模糊隶属度函数,然后用隶属度最大的一类所对应的子模型进行动态学习,并更新子模型.将所提出的软测量建模方法用于对L-赖氨酸发酵过程关键生物量参数的预测,实验结果表明所提出的建模方法可以有效地增强软测量模型适应工况变化的能力,提高其预测精度.     

点云数据的几何属性分析及区域分割

为了提高参数化反求建模的效率,提出一种基于微分几何量统计分析的区域自动分割算法。该方法将点云划入规则分布的三维栅格;将栅格中测量点的几何属性值映射到法曲率坐标系和高斯球上,利用假设检验法识别映射点的分布模式;基于映射点的聚类性质、栅格的拓扑关系和分布拟合的结果分割与二次曲面、拉伸面和直纹面等特征曲面对应的数据区域。实例表明：该算法可以稳定、高效地提取点云中的特征信息,能够广泛应用于虚拟现实、计算机视觉等领域。     

综合能源线上服务推荐算法研究

随着市场竞争的日趋激烈和电力产业的不断升级,综合能源服务正成为未来电力发展的新趋势。综合能源线上电商化服务是未来电网智能能源的关键组成部分,也是从电网能源集成服务向多能源服务提供商竞争供应战略转型的重要途径,一种有效的综合能源服务推荐方法对综合能源公司在能源竞争中占据有利地位具有重要作用。鉴于此,根据用户的兴趣特点和用户在系统中的行为数据来挖掘用户的兴趣偏好,选取部分数据建立用户兴趣图谱并进行谱聚类,将聚类后的数据导入随机森林模型进行评分预测训练,剩余数据提取用户属性信息导入模型获取预测评分,并与原始评分进行对比,以验证模型的有效性。     

设计过程信息建模及重组集成框架研究

在综合分析现有并行设计建模研究的基础上，扩展了图论概念，提出了一种基于扩展有向图和设计结构矩阵进行信息建模和重组的新方法。基于上述方法，提出了从设计活动对应的扩展有向图直接到设计结构模型映射的集成框架系统，基于该框架开发了原型系统，并结合模具设计实例来验证访框架的有效性。     

基于自组织映射的齿轮箱状态监测可视化研究

提出了一种自组织映射网络训练结果的可视化方法——距离映射法,该方法通过计算出竞争层神经元权矢量与输入模式的相似度,并综合考虑神经元的网格分布,把输入矢量降维映射到二维平面。结合该方法研究了自组织映射网络在齿轮箱故障识别和状态监测中的应用。与U－矩阵法相比,该方法能更加清楚地将齿轮正常、裂纹和断齿状态的特征数据映射到二维平面的不同区域,将齿轮箱状态聚类分开,特征数据在平面上的映像点轨迹变化趋势直观反映了齿轮箱工作状态的变化,便于及时监测识别出齿轮的早期故障及其变化趋势。     

基于信息驱动的拆卸设备设计方法研究

在深入分析拆卸类设备特点的基础上,提出一种基于信息驱动的拆卸设备设计方法。通过定义和分析拆卸类设备的用户域、设计分析域、物理结构域和工艺域信息,构建拆卸对象的拆卸过程信息模型;基于拆卸过程稳定性,提出一种拆卸序列规划算法;结合拆卸类设备主要特征,分析拆卸过程中各种信息与设备物理结构之间的相互关系;归纳拆卸对象信息的不确定性对拆卸装置结构的影响,构建拆卸设备结构设计主参数矩阵,提出一种实现用户域信息和设计分析域信息向设备物理结构映射的方法,完成拆卸过程信息模型驱动的拆卸设备结构设计,力求设计出既具有独立性又具有通用性和鲁棒性的拆卸设备。通过液压油缸拆解平台设计实例,验证了该方法的有效性和实用性。     

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.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.