Le monde de la pratique

The Green Building Materials '96 (GBM '96) conference brought manufacturers of building materials and products into the process of defining what may be called ‘green building materials’. Forty-seven manufacturers and associations presented information on environmental and associated quality criteria of their products. In addition, materials analysis and certification, building design, implementation, information sources and marketing were discussed. Charles J. Kibert and Gisela Bosch report.     

Specification and verification of reactive system behaviour: The Railroad Crossing example

In this paper we present an approach to the specification and verification of reactive systems. The approach uses Timed Statecharts and Real Time Logic for the specification of temporal behaviour, and theorem proving techniques for the verification of safety and utility properties. Formal verification is achieved through the automation of semi-formal (rigorous) proofs using a theorem prover (Proofpower HOL). To illustrate the approach, we use the Railroad Crossing Problem, which has been proposed, along with a set of criteria for assessment, as a benchmark for the comparison of real-time formalisms. We conclude with our assessment of the approach against the proposed criteria.     

Abstract Interaction Objects

The concept of an ‘interactor’ has been introduced by Faconti and Paterno' [6] as an abstraction of an entity in interactive graphics capable of both input and output. However the notion of interaction object need not be confined to graphics systems; it represents a useful structure for thinking and reasoning about the behaviour of interactive systems in general. As part of Esprit Basic Research Action 7040 (Amodeus-2) we are using the concept of interactor, and existing work on state-based processes and agents, to develop a model and theory of interactive systems. In this paper we describe two formal models for interaction objects and sketch how they can be used to build a small vocabulary of operators to support the rigorous specification of a graphics system. Our model differs from the approach of Faconti and Paterno' in that it abstracts away from any specific graphics framework and is thus suited to the level of abstraction demanded by formal approaches to system development.     

Architectural Specifications in CASL

One of the most novel features of CASL, the Common Algebraic Specification Language, is the provision of so-called architectural specifications for describing the modular structure of software systems. A brief discussion of refinement of CASL specifications provides the setting for a presentation of the rationale behind architectural specifications. This is followed by some details of the features provided in CASL for architectural specifications, hints concerning their semantics, and simple results justifying their usefulness in the development process. Received October 2000 / Accepted in revised form July 2001     

Critique of the Lake Arrowhead Three

The photograph and autobiography of Dr. Leslie Lamport were published in Volume 4, Issue No. 2, 1990 on page 59     

压力容器对焊条的技术要求

为提高压力容器制造质量，作者将压力容器规范与焊条国家标准分析对比，从“熔敷金属的化学成分”、“敷金属的机械性能”等１０个方面进行了论证，说明了制订“压力容器用焊条技术条件”的必要性。     

复合材料构件MBD模型规范化检查系统研究及应用

随着MBD技术在航空复合材料构件设计当中的应用,三维模型成为产品几何与非几何信息的唯一载体,是生产制造过程中的主要依据。由于复合材料构件结构多样性以及设计表达的复杂性,仅靠设计人员经验不能保证三维模型的质量,需要建立全面的建模规范以及面向设计/制造的检查系统来实时指导和规范复合材料构件全三维建模。为了实现对复合材料构件MBD模型的质量控制,研究了基于检查模板的构件模型规范性检查技术,对复合材料构件建模过程进行了规范性分析,并设计了构件MBD模型规范化检查系统,保障了三维模型定义的规范性、完整性和工艺性。基于B/S和C/S混合模式进行了系统开发,将其应用到某航空制造企业复合材料构件建模过程,并以某复合材料构件三维模型的检查为例验证了系统的可行性。     

城市园林绿化数字化建设标准研究初探

数字化建设是城市园林绿化建设的一大趋势,很多城市和地区已进行了相关探索,园林绿化数字化建设的标准成为当前园林绿化工作的当务之急。从城市园林绿化数字化建设的必要性入手,在分析域外和我国城市园林绿化数字化标准建设的基础上,提出城市园林绿化数字化建设标准体系构建要遵循系统性、先进性和全局性原则,初步构建了城市园林绿化数字化标准体系,探索性提出了城市园林绿化数字化标准主要内容,进而提出了加强城市园林绿化数字化标准建设的4条建议。     

基于安卓电视机芯智能升级的应用研究

对比了目前几种安卓电视智能升级方案,提出了一种在现有电视技术条件下,通过一个自定义接口完成安卓电视机芯智能升级的方案。该方法具有电视整机机芯升级简单、便捷、成本低、原有整机利用率高的优点。并以50个管脚的自定义接口为例,具体阐述了安卓电视机芯升级的软件、硬件解决方案。     

用Z语言形式化扩展事件踪迹图

软件体系结构被看成是现代软件技术的重要因素之一 ,而一个软件系统结构的关键就是它可以分解成组件和组件交互的规格说明。扩展事件踪迹图 (ExtendedEventsTraces ,EETs)是一种用来描述组件交互的图形技术 ,它允许我们用图来定义结构中经常发生的交互模型 ,并且在多种上下文中可实例化 ,因而可以重用。虽然EETs的图形表示很直观 ,但是语义不够精确 ,因此 ,在本文中将使用形式规格说明语言Z来形式化EETs。并且 ,给出了形式描述EETs的几个应用例子