中小型印刷企业采购管理信息系统设计

利用UML建模工具对中小型印刷企业采购管理信息系统进行了系统设计.采用活动图进行系统动态建模,通过定义类和类图进行了系统静态建模,并通过定义数据的存储结构和存储过程对数据库进行设计.     

中小型印刷企业采购管理信息系统分析

利用UML建模工具对中小型印刷企业采购管理信息系统进行了分析.通过定义系统中的角色、用例和用例图对中小型印刷企业采购管理信息系统进行了分析.     

基于云计算的印刷企业供应物流信息系统

目的研究基于云计算的中小型印刷企业供应物流管理中的采购管理和库存管理系统,实现按需付费的供应物流管理服务。方法首先采用基于BPMN(业务流程建模与标注)的业务流程和用例图对系统进行分析,构建系统的业务流程和数据流程模型;其次采用类图实现系统的数据库设计,采用标准化的服务语义定义系统的服务接口;最后在本地计算机上开发测试系统,并将系统部署到GAE(Google App Engine)平台上。结果基于云计算的中小型印刷企业供应物流管理系统可满足中小型印刷企业拿来即用、按需付费的低成本信息化需求。结论该系统将供应物流管理系统和云计算技术结合起来,提高了中小型印刷企业的信息化水平,降低了企业信息化的成本。     

基于SOA的办公自动化管理系统设计

基于SOA理论,本文以办公自动化管理系统的设计为例,运用面向服务的分析与设计方法(SOAD)和Web服务技术,利用可视化统一建模语言UML和面向服务的统一过程(SOUP)进行分析和建模。系统应用以下技术提高整体性能:采用Web缓存技术加快系统的响应时间,采用数据库连接池技术提高数据库的存储访问效率,采用同步令牌机制Token避免重复提交,有效减少了冗余数据的产生等等。     

汽轮发电机定子绕组参数化建模方法研究及系统开发

针对汽轮发电机定子端部绕组结构的复杂性提出了用圆锥面展开图实现空间三维形状的线棒建模方法.通过分析绕组的结构及设计成型和组装原理,建立了线棒参数化建模及装配的数学模型,并给出了三维建模的关键步骤,在此基础上结合二次开发技术、计算机编程技术以及数据库技术设计开发了基于UG/NX平台的汽轮发电机定子端部绕组参数化自动建模系统.以某百万千瓦级汽轮发电机定子端部绕组为例,验证了该建模方法及参数化自动建模系统的有效性和可行性.     

基于UML的网上图书销售系统的建模与设计

运用基于UML的面向对象分析方法,按照软件工程的思想,借助于统一建模语言,使用Rational Rose为建模工具对网上图书销售系统进行建模设计,利用表示系统静态特征的UML类图、用例图和描述系统动态行为特征的时序图对其进行详细描述。     

基于图文法的产品族配置及其建模研究

根据产品族生成机理与图语言生成机理的相似性,提出了一种产品族的图文法表达方法,并根据产品族的图文法模型构建了基于图文法的产品族配置系统的体系结构.用UML对基于图文法的产品族配置系统进行用例建模、静态建模、动态建模以及编码与部署分析,从而为系统的具体开发做准备.     

基于MBD的全三维参数化建模技术

分析了基于模型定义的技术概念与数据集的内容,以及它在规范树上的表达方式.在零件建模中引入MBD技术,通过MBD的技术要求建立规范的MBD模型,并且在新的MBD模型中引入了参数化的概念,提出了基于模型定义的全三维参数化建模方法.以某飞机框类零件为例,建立了基于MBD的某飞机框类零件参数化模型.应用此建模方法能够大幅度提高设计效率,减少设计工作量,进而缩短产品的开发周期.     

教学管理数据库系统的分析和设计

为提高教学管理质量和效率,设计一个高效的数据库应用系统,主要介绍利用Sysbase公司的数据建模工具PowerDesigner进行数据库的分析和设计的过程,即根据需求分析的结果,进行概念结构设计,设计E-R图,进而设计物理结构,并用规范化理论优化数据库逻辑模式。     

用ObjectARX实现设计图纸的管理

对制造业中设计人员最关心的设计图纸的计算机管理问题进行了研究和开发。对AutoCAD中的ObjectARX技术的功能和特点进行了概述，提出了对设计图纸的图形文件采用以设计号为基础的树型管理方式，并通过ObjectARX技术，以AutoCAD为背景，实现对设计图纸的自动化管理；同时介绍了图纸数据库的存储模式，并对于如何在数据库中定义存储过程和使用触发器给出了程序实现方法。     

基于Pandat的Ti-Al系相图计算及热力学评估

基于相图计算理论,用Pandat 2016热力学计算软件、最新的钛合金数据库和热力学模型,计算研究了Ti-Al二元系相图。从相律、相图的特殊点、各相存在的范围、相变点等方面对其进行了详细的热力学评估。计算结果表明:计算相图和实验相图吻合得较好,其相对误差基本都在5%以内,为推广到三元或更高元体系相图奠定了基础。随后提出了一个新的计算Ti-Al二元系中(α+β)/β相变点的公式,其置信度为99.982%,与经验计算公式相比,计算更为准确,具有一定的参考价值和学术交流意义。     

网络印刷服务平台功能模型的分析及建立

对网络印刷服务平台的功能需求进行了分析,并利用UML建模法为其建立了功能模型。分别选取UML用例图描述了网络印刷服务平台的静态功能,以UML时序图描述了网络印刷服务平台的动态业务流程,二者共同构成网络印刷服务平台的功能模型,为今后网络印刷服务平台的开发提供了依据。     

基于可靠性框图的可靠性建模研究

针对传统可靠性仿真模型建模繁琐、编程困难的问题,以可靠性框图为基础,设计了基于ExtendSim的可靠性建模流程,以两单元并联可修系统为例,建立了基于“致命修复”和“即坏即修”策略的仿真模型,并与解析模型进行了对比验证.仿真结果表明建立的可靠性模型是可信的,且此建模方法易于工程技术人员掌握,具有一定的推广价值．     

基于面向对象技术的玻璃包装容器CAD研究

应用面向对象技术,在分析玻璃包装容器结构的基础上,论述了玻璃包装容器CAD表示方法,将玻璃容器整个结构分两个层次,采用C 语言中类加以实现.论述基于参数化和数据库技术的玻璃容器CAD技术,能方便地辅助设计和表达玻璃包装容器.该系统基于WINDOWS平台,用Visual C 开发而成.     

基于C/S与B/S的计量管理信息系统

文章分析探讨了现代企业计量器具管理存在的不足之处,研究了运用先进的数据库和网络技术设计出的基于C／S与B／S混合结构的计量器具管理信息系统,并对系统的功能结构和数据库设计作了详尽的分析。     

Freezing Transition Studies Through Constrained Cell Model Simulation

In the present work, a simulation method based on cell models is used to deduce the fluid–solid transition of a system of particles that interact via a pair potential, \(\phi \left( r\right) \) , which is of the form \(\phi \left( r\right) = 4\epsilon \left[ \left( \sigma /r\right) ^{2n}- \left( \sigma /r\right) ^{n}\right] \) with \(n=10\) . The simulations are implemented under constant-pressure conditions on a generalized version of the constrained cell model. The constrained cell model is constructed by dividing the volume into Wigner–Seitz cells and confining each particle in a single cell. This model is a special case of a more general cell model which is formed by introducing an additional field variable that controls the number of particles per cell and, thus, the relative stability of the solid against the fluid phase. High field values force configurations with one particle per cell and thus favor the solid phase. Fluid–solid coexistence on the isotherm that corresponds to a reduced temperature of 2 is determined from constant-pressure simulations of the generalized cell model using tempering and histogram reweighting techniques. The entire fluid–solid phase boundary is determined through a thermodynamic integration technique based on histogram reweighting, using the previous coexistence point as a reference point. The vapor–liquid phase diagram is obtained from constant-pressure simulations of the unconstrained system using tempering and histogram reweighting. The phase diagram of the system is found to contain a stable critical point and a triple point. The phase diagram of the corresponding constrained cell model is also found to contain both a stable critical point and a triple point.     

Application of the cause–consequence diagram method to static systems

In the last 30 years, various mathematical models have been used to identify the effect of component failures on the performance of a system. The most frequently used technique for system reliability assessment is Fault Tree Analysis (FTA) and a large proportion of its popularity can be attributed to the fact that it provides a very good documentation of the way that the system failure logic was developed. Exact quantification of the fault tree, however, can be problematic for very large systems and in such situations, approximations can be used. Alternatively, an exact result can be obtained via the conversion of the fault tree into a binary decision diagram (BDD). The BDD, however, loses all failure logic documentation during the conversion process.This paper outlines the use of the cause–consequence diagram method as a tool for system risk and reliability analysis. As with the FTA method, the cause–consequence diagram documents the failure logic of the system. In addition to this the cause–consequence diagram produces the exact failure probability in a very efficient calculation procedure. The cause–consequence diagram technique has been applied to a static system and shown to yield the same result as those produced by the solution of the equivalent fault tree and BDD. On the basis of this general rules have been devised for the correct construction of the cause–consequence diagram given a static system. The use of the cause–consequence method in this manner has significant implications in terms of efficiency of the reliability analysis and can be shown to have benefits for static systems.     

A grounded theory model for analysis of marine accidents

The purpose of this paper was to design a conceptual model for analysis of marine accidents. The model is grounded on large amounts of empirical data, i.e. the Swedish Maritime Administration database, which was thoroughly studied. This database contains marine accidents organized by ship and variable. The majority of variables are non-metric and some have never been analyzed because of the large number of values. Summary statistics were employed in the data analysis. In order to develop a conceptual model, the database variables were clustered into eleven main categories or constructs, which were organized according to their properties and connected with the path diagram of relationships. For demonstration purposes, one non-metric and five metric variables were selected, namely fatality, ship's properties (i.e. age, gross register tonnage, and length), number of people on board, and marine accidents. These were analyzed using the structural equation modeling (SEM) approach. The combined prediction power of the ‘ship's properties’ and ‘number of people on board’ independent variables accounted for 65% of the variance of the fatality. The model development was largely based on the data contained in the Swedish database. However, as this database shares a number of variables in common with other databases in the region and the world, the model presented in this paper could be applied to other datasets. The model has both theoretical and practical values. Recommendations for improvements in the database are also suggested.