基于因果行为轮廓的流程变体聚类挖掘方法

由于应用的更改和流程模型的自适应性,导致现实应用中存在大量来自同一模型的流程变体。这些流程变体在结构功能上存在诸多共同之处,但至少存在一些细节结构相互区分,配置和维护这些流程变体非常困难。为实现使用较少的系统模型来描述流程变体,提出一种流程变体聚类挖掘算法。首先结合因果行为轮廓的概念将变体模型矩阵化,然后应用加权余弦相似度来聚类活动并确定它们之间的行为关系,最后通过反复迭代直到聚类所有活动,得到一个目标参考流程模型,该模型比原参考模型更容易配置不同的流程变体。仿真实验中,将该算法和传统的流程挖掘算法,以及经典的启发式算法进行对比,结果表明了该算法在挖掘参考模型方面的可行性和有效性。

流程变体向可配置流程模型的变更传播

鉴于大型企业中不同使用者修改同一业务流程时,业务流程变体将随业务需求的更改发生变化,为了进一步管理业务流程家族,需要一种可以将施加于流程变体上的变更操作传播到可配置流程模型上的变更传播机制,着重研究了有效完成流程变体与可配置模型变更传播和协同进化的方法。该方法将流程变体与可配置模型的映射关系规范化,进一步定义了一系列变更操作,将在变体上的修改同步映射到可配置模型中,然后用清洁操作清除传播后模型的不合法部分。通过SAP EPC参考业务流程数据集上的实验证明了所提流程变更传播方法的可行性和普适性。

基于Petri网的流程变体合并方法

业务融合时往往需要将已有的多个流程合并,从而形成新的满足实际需求的业务流程,如何识别已有业务流的共性特征来消除流程冗余具有较大的实际应用价值。因此,提出了一种基于Petri网的流程变体合并方法。首先,由计算匹配分数算法计算多个流程变体间不同组合的匹配分数,由此来选定一对匹配分数最高的流程变体组合;然后,根据提出的合并算法提取流程变体组合的公共部分,创建对应的副本,并将流程变体间存在的差异使用可配置连接符的分支进行合并,进而生成单个可配置的流程模型。合并后的流程模型可以捕获输入模型的所有行为,且可以对模型中的节点溯源,以此来判定节点来自于哪个流程变体。

基于分组公平控制流结构的流程变体合并方法

合并流程变体模型能够快速地构建满足新需求的单一流程模型,对流程变体进行合并具有较大的实际应用价值,因此,文中提出了一种利用分组公平控制流结构的流程变体合并方法。首先,利用Petri网中的分组公平将流程变体分割为单个的变体片段;其次,提取出变体片段的控制流路径,并在此基础上构建其矩阵表现形式,进而将流程变体合并为单一的流程模型;最后,通过形式化证明验证合并后的流程模型可以捕获输入流程模型的所有行为,并且可以检测在合并模型中是否产生了不期望的行为。

基于行为轮廓的流程模型及其流程变体的距离相似性分析

针对已有研究对距离相同的流程变体无法进一步区分的问题,利用行为轮廓在描述流程模型相似性方面强大的分析功能,提出了基于行为轮廓的距离相似性分析方法,对流程模型及其流程变体的相似性程度进行了研究。在流程族的模型距离相等的基础上引入行为轮廓相似性度,将距离与行为轮廓相似性度相结合,利用二维度量指标,将流程族模型的结构特性和行为特性进行综合评判,更加全面的分析流程模型及其流程变体的相似程度,解决已有文献使用单一维度无法区分流程变体间差异的问题。

基于行为轮廓一致性的流程模型距离的研究

针对流程模型及其变体,当距离相同时,用单一的距离量无法衡量变体之间的差异。为解决这一问题,首先引入行为轮廓一致性度的概念,将距离和轮廓一致性结合在一起,然后给出轮廓一致性距离的形式化定义,利用轮廓一致性距离定量评价流程变体和原始参考模型的相关程度,最后,应用轮廓一致性距离成功区分6个距离相等的流程变体,进一步拓展了已有研究对流程变体和原始模型关系的相关结论。

Model of coupled gas flow and deformation process in heterogeneous coal seams and its application

The heterogeneity of coal was studied by mechanical tests. Probability plots of experimental data show that the mechanical parameters of heterogeneous coal follow a Weibull distribution. Based on elasto-plastic mechanics and gas dynamics, the model of coupled gas flow＇ and deformation process of heterogeneous coal was presented and the effects of heterogeneity of coal on gas flow and failure of coal wcrc investigated. Major findings include： The effect of the heterogeneity of coal on gas flow and mechanical thilure of coal can be considered by the model in this paper. Failure of coal has a great effect on gas flow.

Experimental Study of Drop Deformation and Breakup in Simple Shear Flows

The experimental results of the deformation and breakup of a single drop immersed in a Newtonian liq-uid and subjected to a constant shear rate which generated by counter rotating Couette apparatus were presented in this paper. From experimental observations, the breakup occurred by three mechanisms, namely, necking, end pinching, and capillary instability. Quantitative results for the deformation and breakup of drop are presented. The maximum diameter and Sauter mean diameter of daughter drops and capillary thread radius are linearly related to the inverse shear rate and independent of the initial drop size, the dimensionless wavelength which is the wave-length divided by the thread width at breakup is independent of the shear rate and initial drop size, and the deforma-tion of threads follows a pseudo-affine deformation for Cai/Cac larger than 2.

A Stochastic Description of Transition Between Granular Flow States

Two-dimensional granular flow in a channel with small exit is studied by molecular dyhamics simulations. We firstly define a key area near the exit, which is considered to be the choke area of the system. Then we observe the time variation of the local packing fraction and flow rate in this area for several fixed inflow rate, and find that these quantities change abruptly when the transition from dilute flow state to dense flow state happens. A relationship between the local flow rate and the local packing fraction in the key area is also given. The relationship is a continuous function under the fixed particle number condition, and has the characteristic that the flow rate has a maximum at a moderate packing fraction and the packing fraction is terminated at a high value with negative slope. By use of the relationship, the properties of the flow states under the fixed inflow rate condition are discussed in detail, and the discontinuities and the complex time variation behavior observed＇in the preexisting works are naturally explained by a stochastic process.

Painleve Analysis and Determinant Solutions of a (3+1)-Dimensional Variable-Coefficient Kadomtsev-Petviashvili Equation in Wronskian and Grammian Form

In this paper, the investigation is focused on a （3＋1）-dimensional variable-coefficient Kadomtsev- Petviashvili （vcKP） equation, which can describe the realistic nonlinear phenomena in the fluid dynamics and plasma in three spatial dimensions. In order to study the integrability property of such an equation, the Painlevé analysis is performed on it. And then, based on the truncated Painlevé expansion, the bilinear form of the （3＋1）-dimensionaJ vcKP equation is obtained under certain coefficients constraint, and its solution in the Wronskian determinant form is constructed and verified by virtue of the Wronskian technique. Besides the Wronskian determinant solution, it is shown that the （3＋1）-dimensional vcKP equation also possesses a solution in the form of the Grammian determinant.

The Third Invariant Form of Hydrodynamic Equations and Application for Definition of Water Hammer Characteristics in Pipe

There were for a long time two invariant forms of hydrodynamic equations： one was related to coordinate system of references, and the other was versus to measure units of characteristics. These both invariant forms had important roles in the development of theoretical and practical applications of hydro-aerodynamics and related industries. The third invariant form of hydrodynamic equations is one for the dimensions of spaces. For this goal, the hyper quantities （space and physics） are introduced. Then these are created we can easily cover all problems in arbitrary dimensions （3D, 2D, 1D, separate space for liquids or constituent matters）. In particularly, when they are applied to water hammer problem, which is an especially problem, we can receive immediately celerity and pressure of the event.

Responses of Hydrological Processes to Climate Change in the Zhujiang River Basin in the 21st Century

In this study, discharge at the outlet of Xijiang River, the biggest sub-basin of the Zhujiang River, was simulated and projected from 1961 to 2099 using the hydrological model HBV-D. The model uses precipitation and temperature data from CISRO/MK3 5, MPI/ECHAM5, and NCAR/CCSM3 under three greenhouse gas emission scenarios (SRES A2, A1B, B1). The results in water resources and flood frequency suggest that annual precipitation and annual runoff would increase after 2050 relative to the reference period of 1961-1990. In addition, increasing trends have been projected in area averaged monthly precipitation and runoff from May to October, while decreasing trends in those from December to February. More often and larger floods would occur in future. Potential increase in runoff during the low-flow season could ease the pressure of water demand until 2030, but the increase in runoff in the high-flow season, with more often and larger floods, more pressure on flood control after 2050 is expected.

Modeling of Bubble Motion in Two Dimensional Space

The equations of motion of a bubble, expanding adiabatically through an incompressible viscous fluid, are deduced when the centre of the bubble moves in a vertical plane in the presence of gravitational acceleration, acting vertically downwards. The non-linear equations of motion obtained are solved numerically for different values of the various parameters of the problem. The path traced by the centre of the bubble and velocity of the centre, the change of radius R with time, and the influence of the buoyancy force, which is experienced by the expanding bubble for different values of the gravitational acceleration on these quantities, are investigated. The radius R（t） of the bubble is found to vary periodically with time when the acceleration due to gravity is small. But when the acceleration due to gravity increases, this periodicity in the value of R（t） with t is lost. The influence of viscosity in determining the periodicity of the bubble motion is also investigated.

Thermal Creep Flow for the Boltzmann Equation

It is known that the Boltzmann equation has close relation to the classical systems in fluid dynamics. However, it provides more information on the microscopic level so that some phenomena, like the thermal creep flow, can not be modeled by the classical systems of fluid dynamics, such as the Euler equations. The author gives an example to show this phenomenon rigorously in a special setting. This paper is completely based on the author's recent work, jointly with Wang and Yang.

Numerical Simulation of 2-D Radiation-Drive Ignition Implosion Process

A Lagrangian compatible radiation hydrodynamic algorithm and the nuclear dynamics computing module are developed and implemented in the LARED Integration code, which is a radiation hydrodynamic code based on the 2-D cylindrical coordinates for the numerical simulation of the indirect-drive Inertial Confined Fusion. A number of 1-D and 2-D ignition implosion numerical simulations by using the improved LARED Integration code (ILARED) are presented which show that the 1-D numerical results are consistent with those computed by the 1-D radiation hydrodynamic code RDMG, while the simulation results of the 2-D low-mode radiative asymmetry and hydrodynamic instability growth,according to the physical analysis and anticipation, are satisfactory. The capsules driven by the sources from SGII experiments are also simulated by ILARED, and the fuel shapes agree well with the experimental results. The numerical simulations demonstrate that ILARED can be used in the simulation of the 1-D and 2-D ignition capsule implosion using the multi-group diffusion model for radiation.

A Derivation of the Entropy-Based Relativistic Smoothed Particle Hydrodynamics by Variational Principle

In this work, a second order smoothed particle hydrodynamics is derived for the study of relativistic heavy ion collisions. The hydrodynamical equation of motion is formulated in terms of the variational principle. In order to describe the fluid of high energy density but of low baryon density, the entropy is taken as the base quantity for the interpolation. The smoothed particle hydrodynamics algorithm employed in this study is of the second order, which guarantees better particle consistency. Furthermore, it is shown that the variational principle preserves the translational invariance of the system, and therefore improves the accuracy of the method. A brief discussion on the potential implications of the model in heavy ion physics as well as in general relativity are also presented.

Soliton Solutions, Bcklund Transformations and Lax Pair for a(3 + 1)-Dimensional Variable-Coefficient Kadomtsev–Petviashvili Equation in Fluids

Under investigation in this paper is a （3 q- 1）-dimensional variable-coefficient Kadomtsev-Petviashvili equation, which describes the propagation of surface and internal water waves. By virtue of the binary Bell polynomials, symbolic computation and auxiliary independent variable, the bilinear forms, soliton solutions, Backlund transformations and Lax pair are obtained. Variable coefficients of the equation can affect the solitonic structure, when they are specially chosen, while curved and linear solitons are illustrated. Elastic collisions between/among two and three solitons are discussed, through which the solitons keep their original shapes invariant except for some phase shifts.

Free Convective Nonaligned Non-Newtonian Flow with Non-linear Thermal Radiation

The present study explores the free convective oblique Casson fluid over a stretching surface with non-linear thermal radiation effects. The governing physical problem is modelled and transformed into a set of coupled non-linear ordinary differential equations by suitable similarity transformation, which are solved numerically with the help of shooting method keeping the convergence control of 10^(-5) in computations. Influence of pertinent physical parameters on normal, tangential velocity profiles and temperature are expressed through graphs. Physical quantities of interest such as skin friction coefficients and local heat flux are investigated numerically.