State Based Static and Dynamic Formal Analysis of UML State Diagrams

Design and specification is a serious issue in software engineering because of the semantics involved in transforming the real world problems to computer software systems. Unified Modeling Language (UML) has been accepted as a de facto standard for design and specification of object oriented systems. Unfortunately, UML structures lack defining semantics of a system. Formal methods are proved powerful, particularly, at requirement specification and design level. For a moment, formal methods are not welcomed because of much use of mathematics in formal languages. Therefore, a linkage between UML and formal methods is required to overcome the above deficiencies. In this paper, a new approach is developed by integrating UML and Z specification focusing on state diagram considering both the syntax and semantics. It is believed that this new approach will be effective and useful both at academics and industrial level. The resultant formal models of the approach are analyzed and validated using Z/Eves tool.

基于WF State Machine的UML Communication Diagram动态构建及测试

在基于UML的业务流程分析与设计过程中,从静态模型分析到动态模型构建,经过一系列抽象转换和代码实现,往往满足不了业务需求,缺少一种所见即所得的业务过程实现。在探索UMLCommunicationDiagram和WF StateMachine业务流程映射关系的基础上,选取UML用户指南中典型案例,研究从CommunicationDiagram到State Machine编程模型之间的静态映射和动态规则转换,基于WF可视化地实现了动态构建与测试,解决了从分析、设计到构建的无缝转换。

The contribution of solid-state chemistry in the determination of multicomponent phase diagrams

For a long period of time, the determination of phase diagrams was only supported by experiments related to thermal effects or thermodynamic measurements： thermal analysis, calorimetric measurements, vapor pressures, and EMF measurements. As a matter of fact, solid-solid transformations were not so accurately determined and could not be taken into account in the system＇s analysis. First, X-ray diffraction methods were used as a support for the thermal analysis. Second, the implementation of novel tools in structural analysis （for example, the Rietveld method） has permitted to increase the knowledge of phase stability. Finally, modeling the phases using a Calphad method needed increasingly more structural results to determine and better understand the phase diagrams. On the other hand, the Calphad method has been widely developed for metallic systems, for oxide systems, and in the past 10 years, for some semi-conductor systems, for example, gallium arsenide, cadmium telluride, and lead telluride systems. In such applications, it is very important to bring point defects in the modeling of the phases to map the defects as a function of the chemical composition. Owing to its complexity, this characteristic, the knowledge of which is crucial for the understanding and the control of potential physical applications, was ignored in the previous assessment of semi-conductor systems.

Islay3D—A Programming Environment for Authoring Interactive 3D Animations in Terms of State-Transition Diagram

An educational programming language is a programming language that is designed primarily as a learning instrument and not so much as a tool for writing programs for production. Three-dimensional (3D) interactive animations provide an effective means to engage the attention of the audience to learn programming language. Traditionally, creating 3D games had been difficult as it requires specialized programming skills. However, it had been proven that the state-transition diagram, which is the most fundamental principle for automata, is intuitively so comprehensive that even children can create programs for interactive animations and video games in the two-dimensional world. Islay3D is a programming environment for authoring interactive 3D animations based on this concept. In this paper, the Islay3D animation language is introduced, where a character is modeled as an object, and its behavior is defined in term of a set of state-transition diagrams. The interpretation of the state-transition diagrams to JavaScript is also presented. Finally, the web-based programming environment is introduced. With the web-based platform, the public will be able express their creativity in creating interactive 3D animations and video games easily from within their browser.

Phase Diagram and Edge States of Surface States of Topological Superconductors

Majorana fermions in two-dimensional systems satisfy non-Abelian statistics. They are possible to exist in topological superconductors as quasi particles, which is of great significance for topological quantum computing. In this paper, we study a new promising system of superconducting topological surface state topological insulator thin films. We also study the phase diagrams of the model by plotting the Majorana edge states and the density of states in different regions of the phase diagram. Due to the mirror symmetry of the topological surface states, the Hamiltonian can be block diagonalized into two spin-triplet p-wave superconductors, which are also confirmed by the phase diagrams. The chiral Majorana edge modes may provide a new route for realizing topological quantum computation.

不同降雨量下基于宏观基本图的边界控制策略

在雨雪等不利天气条件下,城市交通拥堵加剧,北京、天津等大城市在降雨条件下经常发生多路段区域性交通拥堵。因此,根据天津市中心城区和市郊区域路网实际交通数据,以路网交通流宏观基本图模型为研究基础,对比不同降雨量以及不同路网的路网交通流时序和宏观基本图变化规律,分析不同降雨量对天津市中心城区和市郊区域路网交通状态的影响。基于不同降雨量下中心城区和市郊区域路网宏观交通流的变化规律,分别构建路网动态演化模型,并对模型的参数进行标定和有效性验证。针对降雨条件下路网发生的区域性拥堵问题,基于宏观基本图的边界控制分别设计了不同降雨量下中心城区和市郊区域路网控制策略,通过仿真实验分析验证了不同控制策略的效果,并给出了能够缓解中心城区和市郊区域路网拥堵的可行策略。结果表明:在小雨天气条件下,将从市郊区域向中心城区的交通流量的转移比例减小量控制在9%~50%范围之内时,中心城区与市郊区域交通状态更加均衡,路网调控效果更好;在大雨天气条件下,将从市郊区域向中心城区的交通流量的转移比例减小量控制在23%~50%范围之内时,中心城区与市郊区域交通状态更加均衡,路网调控效果更好。这表明该控制策略能够缓解中心城区和市郊区域路网的交通拥堵,保障路网交通系统的稳定运行。

Importance Analysis of a Multi-state System Based on Direct Partial Logic Derivatives and Multi-valued Decision Diagrams

Importance analysis quantifies the critical degree of individual component. Compared with the traditional binary state system,importance analysis of the multi-state system is more aligned with the practice. Because the multi-valued decision diagram( MDD) can reflect the relationship between the components and the system state bilaterally, it was introduced into the reliability calculation of the multi-state system( MSS). The building method,simplified criteria,and path search and probability algorithm of MSS structure function MDD were given,and the reliability of the system was calculated. The computing methods of importance based on MDD and direct partial logic derivatives( DPLD) were presented. The diesel engine fuel supply system was taken as an example to illustrate the proposed method. The results show that not only the probability of the system in each state can be easily obtained,but also the influence degree of each component and its state on the system reliability can be obtained,which is conducive to the condition monitoring and structure optimization of the system.

龙眼果粉的水分吸附特性研究

以龙眼果粉为对象,利用静态测量法测定其在不同温度下的吸湿等温线,探究在不同含水率下龙眼果粉的X射线衍射图谱及玻璃化转变温度,并通过数学方程计算其热力学特性参数,以揭示龙眼果粉的水分吸附特性。结果表明,龙眼果粉的吸湿等温线为Ⅲ型等温线,Peleg模型是龙眼果粉吸湿等温线的最佳拟合模型。在水分活度(water activity,A_(w))>0.69时,龙眼果粉水分吸附量显著增加,导致糖类晶体结构消失。龙眼果粉的吸附过程符合熵焓互补理论,其吉布斯自由能为1586.6 J/mol>0,表明可通过控制环境条件来控制龙眼果粉的吸附过程。干基含水率从0.054 g/g上升到0.350 g/g时,龙眼果粉的玻璃化转变温度起始点从14.6℃降低至-26.5℃,其终点从39.1℃下降至-5.8℃。25℃下龙眼果粉的理论最佳贮藏A_(w)为0.086,对应的干基含水率为0.0495 g/g。该研究结果可为龙眼果粉贮藏条件的选择提供参考。

SDLSD:基于状态图的智能合约描述语言

智能合约在区块链发展中扮演着重要角色,并广泛应用于各领域。然而,已有的智能合约语言均由专业的合约研发人员开发,使得相关应用领域的专家难以轻松地设计合约。为了便于领域专家进行智能合约设计,引入领域特定语言的概念,提出一种基于状态图的智能合约描述语言SDLSD。该语言使用状态图描述合约条款与行为之间的逻辑结构关系,并通过词法、语法及语义分析生成可执行的Solidity语言。SDLSD实时支持语法检查、合约库引用和合约模板使用,同时跨平台编译和运行。测试结果表明,该语言不仅具有自然语言的简单性与可读性,还展现出更高的抽象语义,相较于已有方法具有明显优势。

机液并联驱动的工程钻机功率分配分析及工程试验

为实现工程钻机动力系统功率的合理分配,提出机液并联驱动系统的功率分配方式。通过分析该系统的工作原理,得出其传动部分的输出转速、转矩及总传动比的特性曲线;在此基础上,运用键合图理论建立系统功率键合图的物理模型,并推导出该系统的状态方程。基于系统功率流及能量的传递,辨识出系统的功率流及能量的传递由系统分配参数与外负载共同决定。通过构建系统各负载的数学模型,经数值计算得出各负载的关系曲线,结合AMESim软件对仿真模型进行数据分析及钻机工程试验,得出机液并联驱动系统在中高转速有着良好的输出特性,此时,系统的功耗低,钻机钻凿效率高。经分析,应用于钻机的机液并联驱动系统及功率分配方式可满足工程基础开挖的需求,同时为工程装备的动力系统设计提供理论支持和技术借鉴。

基于ASP.NET的高校毕业论文管理系统设计与实现

针对高校毕业论文传统管理方法存在的问题,以昆明幼儿师范高等专科学校为例,分析了毕业论文管理上的难点,并提出了相应的解决方案。使用用例图设计了系统的主要功能,使用状态图设计了系统的主要流程,同时构建了系统数据库。使用ASP.NET语言实现了高校毕业论文管理系统中指导教师出题和学院审核模块、上传开题报告和论文模块、学院分配评审教师模块和教师审核论文模块。系统的应用能够规范高校毕业论文的管理,提高工作效率。

USBCAN总线转换设备在Stateflow下的建模和仿真

USBCAN总线转换设备作为USB总线和CAN总线之间的连接设备,其运行状况和软件设计是否能达到设计的需求,一般的方法很难进行验证,本文通过在Stateflow工具箱下对一种USBCAN总线转换设备进行建模,并且在Matlab/Simulink环境下对整个转换设备运行状态进行仿真验证,实现了USBCAN总线转换设备运行状态的验证,提出了一种新的总线转换设备的仿真和验证方法。

基于第一性原理和热力学计算的TiAl-Nb金属间化合物稳定性和相关系研究

采用基于广义梯度近似密度泛函理论的第一性原理计算和相图计算方法,研究了TiAl-Nb合金中γ、α_(2)、O_(2)和ωo相的热力学和力学性质以及相转变关系.研究表明,第一性原理计算得到的化合物相的参数是准确的,且分析结果与相图计算结果相一致.四个化合物相都是能够稳定存在的相.通过热力学和力学性质的分析,发现α_(2)相更容易转变为O_(2)相,并且在一定条件下可以通过相变反应生成ωo相.而γ相更容易转变为ωo相,但无法生成O_(2)相.

基于WF StateMachine的UML状态图动态构建与测试

采用UML分析与设计的业务信息系统,业务流程经过层层的抽象迭代,缺乏一种透明的业务流程实现。WF提供了可视化的业务过程编程模型,便于实现业务流程自动化,在对比分析WF State Machine和UML状态图的基础上,研究从UML状态图到WF State Machine业务流程映射关系,选取UML中典型状态图,依据一定的命名转换规则,实现了从UML状态图分析设计到WF状态机业务过程可视化的构建,完成了动态测试。

带有并发行为的UML状态机图的形式语义

在软件开发过程中,UML(统一建模语言)状态机图是目前最流行的建模形式之一,它属于半形式化模型,无法用形式化的方法进行推理。为了能对UML状态机图进行推理,现有工作采用Petri网、时序逻辑语言XYZ/E、动态描述逻辑、Z(Object-Z)语言、CHAM化学抽象机等作为状态机图的形式语义,但这些语义都是行为语义,并没有从结构上直接形成体现真并发的形式语义。该文提出一种新的模型——统一结构模型作为带有并发行为的UML状态机图的形式语义,该模型不会增加或减少状态机图的任何信息。基于统一结构模型首先定义了状态机图的格局(全局状态),用于表现状态机图的执行过程,并且给出了UML状态机图的格局的转换规则,说明格局如何在状态机图中执行,在此基础上给出了状态机图的可达性算法,然后还对状态机图的死锁等性质进行了介绍,最后开发出一个原型工具,实现了状态机图的可达性分析,并用实例说明了该方法的应用。

基于UML状态图的PLC程序测试路径生成方法

为了提高可编程序控制器程序的测试效率,提出一种基于统一建模语言状态图的可编程序控制器程序测试路径生成方法。这一方法利用反蚁群算法生成测试路径,可以避免测试路径过多导致的爆炸问题。通过人工蚂蚁搜索未被遍历或信息素最小的顶点,得到测试路径,在满足测试路径充分性覆盖准则的同时,确保数量适中。通过案例试验,验证了方法的可行性和有效性,能够避免与其它文本重复。

学生助学金申报管理系统的设计与实现

助学金申报工作是学生资助工作中的重要环节,传统的助学金申报管理工作存在着工作效率低、易出错等问题。文章针对这些问题,设计与实现了学生助学金申报管理系统。在系统的需求分析与设计阶段,使用UML图形构建了系统的主要模型;在系统的实现阶段,使用ASP.NET(C#)完成了学生助学金申报模块和助学金申报审核模块的代码编写。助学金申报管理系统让申报过程实现无纸化,避免了家庭经济困难学生在传统助学金申报中面临的尴尬,有效地提高了工作效率,降低了易错率。

教科院教研活动网络管理系统的开发与实现

针对教科院教研活动管理上存在的问题,文章首先分析了教研活动的重要性、管理难点、课程类和非课程类教研活动的区别,提出构建教科院教研活动网络管理系统;其次使用用例图构建系统的主要功能模型,使用UML状态图分析教科院课程和教研活动开展的主要流程,使用E-R图分析数据实体的关系模型,使用SQL Server构建系统数据库;最后使用ASP.NET(C#)完成了系统的开发实现。通过使用该系统,提高了教研员组织开展教研活动的工作效率,获得了较好效果,规范了教研活动的管理。

UML模型在信息系统需求分析中的应用

系统需求分析是软件信息系统开发活动的起始环节,使用UML模型进行软件需求分析是目前面向对象的需求分析方法的一种重要方法,根据不同软件系统的需求描述,选取适当的UML分析模型从不同的角度对需求中的功能点进行描述,可以使系统用户、需求分析人员以及未来的设计开发人员能通过多个角度观察目标系统的应用场景、业务流程、系统对象的状态变化;从抽象的维度了解目标系统的功能、系统对象之间的关系、业务规则和约束。通过一个用于车辆管理的信息化系统的需求分析过程,分别探讨了用例图、活动图(业务流程图)、状态转换图三种UML模型的适用场景和使用方法,以及在实践工作中的注意事项。为相似的信息化系统的需求分析实践提供一种可供参考的操作方法。