This article is about only one of those choices, that is the layering of an object oriented class model on top of a purely relational database. This is not to imply this is the only, best or simplest solution, but pragmatically it is one of the most common, and one that has the potential for the most misuse.

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Concurrency is a property of a system in which several behaviors can overlap in time – the ability to perform two or more tasks at once. In the sequential paradigm, the next step in a process can be performed only after the previous has completed; in a concurrent system some steps are executed in parallel.

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We hope that the current discussions surrounding UML2, OCL, MDA, MOF will simplify and clarify the syntax and semantics of UML. Given the potential impact of these discussions on our software engineering practices and tools I encourage more language designers, tool developers and most importantly application engineers to become more proactively involved with these OMG activities. Finally we need to encourage a wide spectrum view of modeling and not limit the expressive power of models to a...

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Mời các bạn cùng tham khảo tài liệu UML Cheatsheet sau đây để bổ sung các thông tin hữu ích về UML cho bản thân. Tài liệu dành cho đối tượng sinh viên ngành Công nghệ thông tin và những ai quan tâm đến UML.

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In my last column, I described UML Collaboration diagrams. Collaboration diagrams allow the designer to specify the sequence of messages sent between objects in a collaboration. The style of the diagram emphasizes the relationships between the objects as opposed to the sequence of the messages. In this column we will be discussing UML Sequence diagrams. Sequence diagrams contain the same information as Collaboration diagrams, but emphasize the sequence of the messages instead of the...

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The UML 2.0 integrates a dialect of High-Level Message Sequence Charts (HMSCs) for interaction modelling. The most noteworthy addition of UML 2.0 interactions to HMSCs is the introduction of negated specifications which can be used to rule out behaviour from implementations. A trace-based semantics for UML 2.0 interactions is proposed which captures both the standard composition operators for UML 2.0 interactions from HMSCs, and the proprietary negation and assertion operators.

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The purpose of this analysis is to assess relative strengths and weaknesses of control and data flow specification in Activity Diagrams and to identify ways of addressing potential deficiencies. In addition, the pattern-based analysis will yield typical solutions to practical process modelling problems and expose some of the ambiguities in the current UML 2.0 draft specification.

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Implementing UML attributes directly in an object-oriented language may not appear to be complex, since such languages already support member variables. The distinction arises when considering the differences between modelling a class and implementing it.

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Mục đích của bài "Tương tác dựa trên Role trong hệ đa Agent" là nhằm trình bày mô hình tương tác dựa trên khái niệm role và xem xét áp dụng mô hình này cho thương lượng song phương trong thương mại điện tử.

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Sparx Systems MDG Technology® for ArcGIS supports visual modeling of geodatabases in Enterprise Architect. It provides a UML profile for modeling ArcGIS concepts, the ability to generate ArcGIS schemas as XML Workspace documents, and reverse engineering of legacy geodatabases into a visual UML model. This tutorial explains how to model an ArcGIS geodatabase in Enterprise Architect and generate a corresponding ArcGIS schema. It also explains how ArcGIS concepts relate to UML notation in...

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Xây dựng cơ sở dữ liệu GIS phục vụ công tác quản lý lớp phủ rừng tỉnh Quảng Ninh nhằm mục tiêu xây dựng cơ sở dữ liệu lớp phủ rừng phục vụ công tác quản lý rừng tỉnh Quảng Ninh.

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This paper is a PhD project report for the course Distributed Embedded Systems at Carnegie Mellon University. Throughout this course, a distributed real-time system – an elevator control system– is specified, designed, built, and simulated. Object Oriented Analysis and Design methods, in specific the Unified Modeling Language (UML) are used when designing the system.

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