An object design framework for structural engineering

Object-oriented principles have introduced several useful concepts for developing complex software systems. As a result, several methodologies have been suggested for the overall design of software systems based on these concepts. Methodologies and frameworks for designing objects that are to be part of the software systems are currently lacking. This paper proposes anobject design framework andmethodology, which utilizes the object-oriented concepts, for planning, organizing and designing structural engineering design objects. Design objects in an integrated structural engineering system are complex and often related to each other in various different ways. The paper also identifies several important relationships among structural engineering design objects. These relationships serve as communication channels through wich design objects send messages to and receive responses from each other. Several examples, drawn from reinforced concrete structures, will be presented to demonstrate the object design methodology and to illustrate how the framework is effective in reducing the complexity of design objects in an integrated structural engineering system.     

光连结的过道——谈王功景观桥夜景

桥不仅中介于两岸之间，而且这桥面之上的空间气候，又不同于桥面下之气候，一个是钢构与天空的对话，一个是钢构与海水的对话．这些不同的型态．引领着一段段新的生活故事在此发生。设计的完成，仅是一段前言的论述，随着居民与游客的集聚，才正开始写下属于王功渔港的新文本。[编者按]     

Possibilities and problems with the use of models as a communication tool in water resource management

Politicians and policy-makers, as well as modellers, often nurses an expectation that model derived results is an objective source of information that can be used to support decisions. However, several prerequisites have to be dealt with in order to ensure that models can be used as legitimate and efficient tools in water resource management. Based on empirical material from recent studies on the use of models in stakeholder dialogues, mainly focusing on catchment nutrient transport, two central problems are identified: (a) Models are laden with choices and thus depend on assumptions and priorities of modellers. (b) There are several factors that influence ability and willingness of stakeholders (as information recovers) to criticize or accept results of the modelling exercise. Recognized factors likely to influence stakeholders' acceptance of model derived results include issues at stake, stakeholders' ability to criticize model derived information, and their trust in the institutions that have developed or applied the used models. Identified prerequisites for successful use of models in integrated water resource management include: consideration of user relevance, awareness of and preparedness to handle constraints linked to communication of model-based results, transparency of used models and data and of involved uncertainties, mutual respect between experts and stakeholders and between involved stakeholder groups, a robust institutional network, and sufficient time for dialogues. Development and use of strategies for participatory modelling, based on a continuous dialogue between experts and stakeholders is recommended as a way to facilitate that the prerequisites for a successful use of models in water resource management are fulfilled.     

柳钢新办公大楼智能管理系统的建设

介绍柳钢新办公大楼智能管理系统的建设设想、建设目的、系统基本功能。     

PC机远程通信方法研究

在分析用电话线及ＭＯＤＥＭ进行ＰＣ机点－点远程通信和利用局城网ＬＡＮ进行ＰＣ机通信的优缺点后，本文介绍用通信服务器进行ＰＣ机远程通信的方法．     

Locality-preserving hash functions for general purpose parallel computation

Consider the problem of efficiently simulating the shared-memory parallel random access machine (PRAM) model on massively parallel architectures with physically distributed memory. To prevent network congestion and memory bank contention, it may be advantageous to hash the shared memory address space. The decision on whether or not to use hashing depends on (1) the communication latency in the network and (2) the locality of memory accesses in the algorithm.We relate this decision directly to algorithmic issues by studying the complexity of hashing in the Block PRAM model of Aggarwal, Chandra, and Snir, a shared-memory model of parallel computation which accounts for communication locality. For this model, we exhibit a universal family of hash functions having optimal locality. The complexity of applying these hash functions to the shared address space of the Block PRAM (i.e., by permuting data elements) is asymptotically equivalent to the complexity of performing a square matrix transpose, and this result is best possible for all pairwise independent universal hash families. These complexity bounds provide theoretical evidence that hashing and randomized routing need not destroy communication locality, addressing an open question of Valiant.This work was started when the author was a student at Oxford University, supported by a National Science Foundation Graduate Fellowship and a Rhodes Scholarship. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author and do not necessarily reflect the views of the National Science Foundation or the Rhodes Trust.     

Ethics is fragile,goodness is not

This paper first illustrates what kind of ethical issues arise from the new information, communication and automation technology. It then argues that we may embrace the popular idea that technology is ethically neutral or even ambivalent without having to close our eyes to those issues and in fact, that the ethical neutrality of technology makes them all the more urgent. Finally, it suggests that the widely ignored fact of normal responsible behaviour offers a new and fruitful starting point for any future thinking about such issues.     

设计沟通中的噪音——从传播学角度看设计沟通中的困难

文章从传播学的角度探讨设计沟通过程中的困难。设计沟通是贯穿于整个设计管理活动的重要环节,是传达信息的主要途径,但在实践过程中却经常遇到困难,导致设计活动无法顺利进行。文章通过引入噪音的概念,分析设计沟通的困难产生的原因,并利用传播学的理论提出通过冗余调节噪音的想法,以解决设计沟通中的问题。     

浅谈光纤通信新技术的应用与研究

在长途通信网和市话通信网中光纤通信网代替电缆通信网已成为被世界所公认的事实。此时因为通信距离影响,导致利用率的不断下降,所以为光纤通信取得进一步发展,必须寻找新的途径,采用新的技术。本文首先简要概述光纤通信技术特点,然后阐明光纤通信新技术的实践应用,最后进行对光纤通信新技术的研究探讨。     

卫星宽带网络系统的研究与分析

本文主要介绍了卫星宽带网络系统的基本原理、技术特点、发展现状和应用趋势,通过研究和分析,证明了卫星宽带网络在信息通信领域具有广阔的应用前景。