ODM: An object oriented data model

ODM is a new data model thatintegrates the features of object oriented programming languages (e.g. Smalltalk-80) and Relational Data Model (RDM). It extends the data structures and operations of RDM and also provides the features of object oriented programming such as improved semantics, data abstraction, reusability of data structures and codes, and extensibility. We have introduced the concept of ‘u-set’ (uniform set) as an extension of relation of RDM. We employ messages to define an extension of RDM attributes and tuples. Definition of classes for databases, u-sets, and tuples allows us to define new (or modify existing) operations for the databases, u-sets, or tuples. Each database and its elements are u-sets.     

面向对象图形核心系统的特征和开发准则

本文在分析传统图形标准的基础上，引用面向对象的概念和方法，研讨了面向对象图形核心系统的特征和开发准则。     

面向对象数据模型到ERwin中ER图模型的转换

本文介绍一种面向对象的数据模型，这个模型ＣＯＲＥ模型为基础，给出ＬＯＧＩＣＷＯＲＫＳ公司的ＥＲｗｉｎ采用的ＥＲ图模型，接着着重讨论一种面向对象数据模型到ＥＲ图模型的转换算法。     

Emerald: A general-purpose programming language

Emerald is a general-purpose language with aspects of traditional object-oriented languages, such as Smalltalk, and abstract data type languages, such as Modula-2 and Ada. It is strongly typed with a non-traditional object model and type system that emphasize abstract types, allow separation of typing and implementation, and provide the flexibility of polymorphism and subtyping with compile-time checking. This paper describes the Emerald language and its programming methodology. We give examples that demonstrate Emerald's features, and compare and contrast the Emerald approach to programming with the approaches used in other similar languages.     

An object-oriented class library for C++ programs

The Object-Oriented Program Support (OOPS) class library is a portable collection of classes similar to those of Smalltalk-80 that has been developed using the C++ programming language under the UNIX operating system. The OOPS library includes generally useful data types, such as String, Date and Time, and most of the Smalltalk-80 collection classes such as OrderedCtn (indexed arrays), LinkedList (singly linked lists), Set (hash tables), and Dictionary (associative arrays). Arbitrarily complex data structures comprised of OOPS and user-defined objects can be stored on disk files or moved between UNIX processes by means of an object I/O facility. The classes Process, Scheduler, Semaphore and SharedQueue provide multiprogramming with coroutines. This paper gives a brief introduction to object-oriented programming and how it is supported by the C+ + programming language. An overview of the OOPS library is also presented, followed by a programming example. The implementation details of two of the class library's more interesting features, object I/O and processes, are described. The paper concludes with a discussion of the differences between the OOPS library and Smalltalk-80 and some observations based on our programming experience with C++ and OOPS.     

谈岭南建筑风格在武广铁路复建房设计中的传承

通过对武广铁路复建房的设计实践,对如何将岭南传统建筑文化与当前规模化生产的住宅相结合做出了新的探索,对岭南建筑风格的传承作了有益的推动。     

汉风古韵山中留--博山石刻艺术园创作札记

以博山石刻艺术园设计为例．分析设计思维在对传统的“继承与创新”命题下思考与蜕变的过程,以及建筑形象塑造的尝试,探讨设计思想摆脱传统风格与形式的束缚,以环境为主题,从环境中具有生命力的要素中寻求启发,进行建筑创作的问题。     

北京朝阳公园规划设计获奖方案的设计理念

继承与创新是公园创作的源泉,成功的设计应使二者得到统一.北京朝阳公园规划设计方案采用传统的手法并结合现代的形式,凝聚了深厚的历史文化内涵,融合了新的生态理论,试图将传统造园艺术运用在现代园林设计中.     

西安市传统商业文化遗产及其空间环境变迁和保护研究

西安市经过百年沉淀,不乏很多有 价值的传统商业存在,其所包含的文化遗产 资源是笔宝贵的财富,但随着城市的发展变 迁,其发展状况并不尽如人意。本文以西安 市传统商业文化遗产的实地调研为基础,通 过对传统商铺及其历史空间环境的发展变迁 和现状的分析研究,从传统商业的人、非物 质文化与物质文化载体所具有的特殊关系角 度,提出西安市传统商业保护与传承发展的 创新方法与思路。     

Inheritance of workflows: an approach to tackling problems related to change

Inheritance is one of the key issues of object-orientation. The inheritance mechanism allows for the definition of a subclass which inherits the features of a specific superclass. When adapting a workflow process definition to specific needs (ad-hoc change) or changing the structure of the workflow process as a result of reengineering efforts (evolutionary change), inheritance concepts are useful to check whether the new workflow process inherits some desirable properties of the old workflow process. Today's workflow management systems have problems dealing with both ad-hoc changes and evolutionary changes. As a result, a workflow management system is not used to support dynamically changing workflow processes or the workflow processes are supported in a rigid manner, i.e., changes are not allowed or handled outside of the workflow management system. In this paper, we propose inheritance-preserving transformation rules for workflow processes and show that these rules can be used to avoid problems such as the “dynamic-change bug.” The dynamic-change bug refers to errors introduced by migrating a case (i.e., a process instance) from an old process definition to a new one. A transfer from an old process to a new process can lead to duplication of work, skipping of tasks, deadlocks, and livelocks. Restricting change to the inheritance-preserving transformation rules guarantees transfers without any of these problems. Moreover, the transformation rules can also be used to extract aggregate management information in case more than one version of a workflow process cannot be avoided.