Cumincad : CUMINCAD Papers : Search Results

CumInCAD is a Cumulative Index about publications in Computer Aided Architectural Design
supported by the sibling associations ACADIA, CAADRIA, eCAADe, SIGraDi, ASCAAD and CAAD futures

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_id	edf5
authors	Arnold, J.A., Teicholz, P. and Kunz, J.
year	1999
title	An approach for the interoperation of web-distributed applications with a design model
source	Automation in Construction 8 (3) (1999) pp. 291-303
summary	This paper defines the data and inference requirements for the integration of analysis applications with a product model described by a CAD/CAE application. Application input conditions often require sets of complex data that may be considered views of a product model database. We introduce a method that is compatible with the STEP and PLIB product description standards to define an intermediate model that selects, extracts, and validates views of information from a product model to serve as input for an engineering CAD/CAE application. The intermediate model framework was built and tested in a software prototype, the Internet Broker for Engineering Services (IBES). The first research case for IBES integrates applications that specify certain components, for example pumps and valves, with a CAD/CAE application. This paper therefore explores a sub-set of the general problem of integrating product data semantics between various engineering applications. The IBES integration method provides support for a general set of services that effectively assist interpretation and validate information from a product model for an engineering purpose. Such methods can enable application interoperation for the automation of typical engineering tasks, such as component specification and procurement.
series	journal paper
more	http://www.elsevier.com/locate/autcon
last changed	2003/05/15 21:22

_id	d79a
authors	Ekholm, Anders and Fridqvist, Sverker
year	1999
title	The BAS*CAAD Information System for Design principles, Implementation, and a Design Scenario
source	Proceedings of the Eighth International Conference on Computer Aided Architectural Design Futures [ISBN 0-7923-8536-5] Atlanta, 7-8 June 1999, pp. 149-164
summary	The objectives of the BAS-CAAD-project are to investigate into theories and methods for computer aided architectural design, with emphasis on requirements of early stages of the design process. Information systems can be characterised as static or dynamic concerning the definition of classes in the model schema, and concerning classification of model objects. The paper presents the BAS-CAAD system, a prototype software that implements the conceptually most important features of a dynamic information system for design. The BAS-CAAD information system is built on a generic ontological framework. The system allows a free combination of attributes, supporting the incremental way that knowledge is built up during design. It provides a generic library structure that allows definition of objects classes in different levels of generalisation that may originate from international standards or the individual designer. For example, in the construction context, it allows modelling of buildings and their parts, as well as user organisations and user activities. The function of the system is illustrated in two scenarios.
keywords	CAD, Design, Dynamic Schema Evolution, Information Systems, Object Oriented Modelling, Product Modelling, Design Scenario
series	CAAD Futures
email
last changed	2006/11/07 07:23

_id	6810
authors	Makkonen, Petri
year	1999
title	On multi body systems simulation in product design
source	KTH Stockholm
summary	The aim of this thesis is to provide a basis for efficient modelling and software use in simulation driven product development. The capabilities of modern commercial computer software for design are analysed experimentally and qualitatively. An integrated simulation model for design of mechanical systems, based on four different "simulation views" is proposed: An integrated CAE (Computer Aided Engineering) model using Solid Geometry (CAD), Finite Element Modelling (FEM), Multi Body Systems Modelling (MBS) and Dynamic System Simulation utilising Block System Modelling tools is presented. A theoretical design process model for simulation driven design based on the theory of product chromosome is introduced. This thesis comprises a summary and six papers. Paper A presents the general framework and a distributed model for simulation based on CAD, FEM, MBS and Block Systems modelling. Paper B outlines a framework to integrate all these models into MBS simulation for performance prediction and optimisation of mechanical systems, using a modular approach. This methodology has been applied to design of industrial robots of parallel robot type. During the development process, from concept design to detail design, models have been refined from kinematic to dynamic and to elastodynamic models, finally including joint backlash. A method for analysing the kinematic Jacobian by using MBS simulation is presented. Motor torque requirements are studied by varying major robot geometry parameters, in dimensionless form for generality. The robot TCP (Tool Center Point) path in time space, predicted from elastodynamic model simulations, has been transformed to the frequency space by Fourier analysis. By comparison of this result with linear (modal) eigen frequency analysis from the elastodynamic MBS model, internal model validation is obtained. Paper C presents a study of joint backlash. An impact model for joint clearance, utilised in paper B, has been developed and compared to a simplified spring-damper model. The impact model was found to predict contact loss over a wider range of rotational speed than the spring-damper model. Increased joint bearing stiffness was found to widen the speed region of chaotic behaviour, due to loss of contact, while increased damping will reduce the chaotic range. The impact model was found to have stable under- and overcritical speed ranges, around the loss of contact region. The undercritical limit depends on the gravitational load on the clearance joint. Papers D and E give examples of the distributed simulation model approach proposed in paper A. Paper D presents simulation and optimisation of linear servo drives for a 3-axis gantry robot, using block systems modelling. The specified kinematic behaviour is simulated with multi body modelling, while drive systems and control system are modelled using a block system model for each drive. The block system model has been used for optimisation of the transmission and motor selection. Paper E presents an approach for re-using CAD geometry for multi body modelling of a rock drilling rig boom. Paper F presents synthesis methods for mechanical systems. Joint and part number synthesis is performed using the Grübler and Euler equations. The synthesis is continued by applying the theory of generative grammar, from which the grammatical rules of planar mechanisms have been formulated. An example of topological synthesis of mechanisms utilising this grammar is presented. Finally, dimensional synthesis of the mechanism is carried out by utilising non-linear programming with addition of a penalty function to avoid singularities.
keywords	Simulation; Optimisation; Control Systems; Computer Aided Engineering; Multi Body Systems; Finite Element Method; Backslash; Clearance; Industrial Robots; Parallel Robots
series	thesis:PhD
last changed	2003/02/12 22:37

_id	1419
authors	Spitz, Rejane
year	1999
title	Dirty Hands on the Keyboard: In Search of Less Aseptic Computer Graphics Teaching for Art & Design
source	III Congreso Iberoamericano de Grafico Digital [SIGRADI Conference Proceedings] Montevideo (Uruguay) September 29th - October 1st 1999, pp. 13-18
summary	In recent decades our society has witnessed a level of technological development that has not been matched by that of educational development. Far from the forefront in the process of social change, education has been trailing behind transformations occurring in industrial sectors, passively and sluggishly assimilating their technological innovations. Worse yet, educators have taken the technology and logic of innovations deriving predominantly from industry and attempted to transpose them directly into the classroom, without either analyzing them in terms of demands from the educational context or adjusting them to the specificities of the teaching/learning process. In the 1970s - marked by the effervescence of Educational Technology - society witnessed the extensive proliferation of audio-visual resources for use in education, yet with limited development in teaching theories and educational methods and procedures. In the 1980s, when Computers in Education emerged as a new area, the discussion focused predominantly on the issue of how the available computer technology could be used in the school, rather than tackling the question of how it could be developed in such a way as to meet the needs of the educational proposal. What, then, will the educational legacy of the 1990s be? In this article we focus on the issue from the perspective of undergraduate and graduate courses in Arts and Design. Computer Graphics slowly but surely has gained ground and consolidated as part of the Art & Design curricula in recent years, but in most cases as a subject in the curriculum that is not linked to the others. Computers are usually allocated in special laboratories, inside and outside Departments, but invariably isolated from the dust, clay, varnish, and paint and other wastes, materials, and odors impregnating - and characterizing - other labs in Arts and Design courses.In spite of its isolation, computer technology coexists with centuries-old practices and traditions in Art & Design courses. This interesting meeting of tradition and innovation has led to daring educational ideas and experiments in the Arts and Design which have had a ripple effect in other fields of knowledge. We analyze these issues focusing on the pioneering experience of the Núcleo de Arte Eletrônica – a multidisciplinary space at the Arts Department at PUC-Rio, where undergraduate and graduate students of technological and human areas meet to think, discuss, create and produce Art & Design projects, and which constitutes a locus for the oxygenation of learning and for preparing students to face the challenges of an interdisciplinary and interconnected society.
series	SIGRADI
email
last changed	2016/03/10 10:01

_id	f154
authors	Amor, Robert and Newnham, Leonard
year	1999
title	CAD Interfaces to the ARROW Manufactured Product Server
source	Proceedings of the Eighth International Conference on Computer Aided Architectural Design Futures [ISBN 0-7923-8536-5] Atlanta, 7-8 June 1999, pp. 1-11
summary	The UK national project ARROW (Advanced Reusable Reliable Objects Warehouse) provides an Internet based framework through which it is possible to identify any of a range of manufactured products meeting specific design criteria. This open framework (based upon the IAI's IFCs) provides a mechanism for users to search for products from any participating manufacturer or supplier based both on specific attributes of a product or on any of the textual descriptions of the product. The service returns the closest matching products and allows the user to navigate to related information including manufacturer, suppliers, CAD details, VR displays, installation instructions, certificates, health and safety information, promotional information, costings, etc. ARROW also provides a toolkit to enable manufacturers and suppliers to more easily map and publish their information in the format utilised by the ARROW system. As part of the ARROW project we have examined the ability to interface from a design tool through to ARROW to automatically retrieve information required by the tool. This paper describes the API developed to allow CAD and simulation tools to communicate directly with ARROW and identify appropriate manufactured information. The demonstration system enables CAD systems to identify the closest matching manufactured product to a designed product and replacing the designed product with the details supplied by the manufacturer for the manufactured product as well as pulling through product attributes utilised by the design application. This paper provides a description of the ARROW framework and issues faced in providing information based upon standards as well as containing information not currently modelled in public standards. The paper looks at issues of enabling manufacturers and suppliers to move from their current world-view of product information to a more data-rich and user accessible information repository (even though this enables a uniform comparison across a range of manufacturer's products). Finally the paper comments on the likely way forward for ARROW like systems in providing quality information to end users.
keywords	Computer-aided Design, Product Retrieval
series	CAAD Futures
email
last changed	2006/11/07 07:22

_id	21c8
authors	Bargiela, Beatriz and Bausset, Raúl Abad
year	1999
title	Sistemas multimediales aplicados a la arquitectura y su conocimiento (Multimedia Systems Applied to Architecture and its Knowledge Base)
source	III Congreso Iberoamericano de Grafico Digital [SIGRADI Conference Proceedings] Montevideo (Uruguay) September 29th - October 1st 1999, pp. 186-191
summary	This text makes a careful description of a great part of the components of the vocabulary of architecture and their syntax. It's structured in two parts, one textual and the other graphic. Due to the acknowledged contribution of the author on the subject of description of vocabulary of the elements of architecture and the research and development works that are entered upon in the master in computer graphics in the informatic field, it was proposed the development of an interactive system that allowed by means of links to connect the different parts of text and their respective graphics. Having as a basis the idiomatic equivalent term in Spanish and English, carried out in another research work, it was considered the possibility to link the text in these two languages besides the original one, french. That's why we've decided to propose the navigation through numeric text and images. This navigation has been already inferred from the reading of the text as intended from the author's that was why our task has been the interpretation of this intention and its translation in an informatic system. The product presented in this work is limited to having designed a methodology and showing its performance with some terms and images, able to make evident the sketch of our idea. The work is made out of the description of the following phases: 1.) Design of its interface; 2.) Compilation and classification of images compilation and classification of text; 3.) Coordination of textual and graphic elements; 4.) Programming of events in the interactive system.
series	SIGRADI
email
last changed	2016/03/10 09:47

_id	2c1d
authors	Castañé, D., Tessier, C., Álvarez, J. and Deho, C.
year	1999
title	Patterns for Volumetric Recognition - Guidelines for the Creation of 3D-Models
source	III Congreso Iberoamericano de Grafico Digital [SIGRADI Conference Proceedings] Montevideo (Uruguay) September 29th - October 1st 1999, pp. 171-175
summary	This piece proposes new strategies and pedagogic methodologies applied to the recognition and study of the subjacent measurements of the architectural projects to be created. This proposal is the product of pedagogic experience, which stems from this instructional team of the department of tri-dimensional models of electronic models. This program constitutes an elective track for the architectural major at the college of architecture, design, and urbanism of the University of Buenos Aires and housed at the CAO center. One of the requirements that the students must complete, after doing research and analytical experimentation through the knowledge that they acquired through this course, is to practice the attained skills through exercises proposed by the department in this case, the student would be required to virtually rebuild a paradigmatic architectonic piece of several sample architects. Usually at this point, students experience some difficulties when they analyze the existing documents on the plants, views, picture, details, texts, etc., That they have obtained from magazines, books, and other sources. Afterwards, when they digitally begin to generate basic measurements of the architectural work to be modeled, they realize that there are great limitations in the comprehension of the tri-dimensional understanding of the work. This issue has brought us to investigate and develop proposals of volumetric understanding of patterns through examples of work already analyzed and digitalized tri-dimensionally in the department. Through a careful study of the existent documentation for that particular work, it is evaluated which would be the paths and basis to adopt through utilizing alternative technologies to arrive at a clear reconstruction of the projected architectural work, the study gets completed by implementing the proposal at the internet site http://www.datarq.fadu.uba.ar/catedra/dorcas
series	SIGRADI
email
last changed	2016/03/10 09:48

_id	4989
authors	Clayton, M.J., Teicholz, P., Fischer, M. and Kunz, J.
year	1999
title	Virtual components consisting of form, function and behavior
source	Automation in Construction 8 (3) (1999) pp. 351-367
summary	Software can produce a product model of a building as a consequence of the designers' actions in drawing and evaluating the design. The actions of the designer include interpreting, predicting and assessing the emerging design and describe the building in terms of forms, functions and behaviors. A software prototype has been implemented that incorporates this understanding of the design process in the field of building design. It employs object-oriented classes to represent forms, functions and behaviors. As a software user draws and interprets the design for multiple evaluation issues, the software creates a unique `virtual component' for each entity. During automated reasoning to evaluate the emerging design, virtual components collect and organize form, function and behavior instances to describe the parts of the building. In comparison to other product models, our approach, which we refer to as a `Virtual Product Model', better accommodates change, provides increased support for the design process and enriches the product representation by including function and behavior.
series	journal paper
more	http://www.elsevier.com/locate/autcon
last changed	2003/05/15 21:22

_id	54a6
authors	Eastman, C. and Jeng, T.S.
year	1999
title	A database supporting evolutionary product model development for design
source	Automation in Construction 8 (3) (1999) pp. 305-323
summary	This paper presents the facilities in the EDM-2 product modeling and database language that support model evolution. It reviews the need for model evolution as a system and/or language requirement to support product modeling. Four types of model evolution are considered: (1) translation between distinct models, (2) deriving views from a central model, (3) modification of an existing model, and (4) model evolution based on writable views associated with each application. While the facilities described support all for types of evolution, the last type is emphasized. The language based modeling capabilities described in EDM-2 include: (a) mapping facilities for defining derivations and views within a single model or between different models; (b) procedural language capabilities supporting model addition, deletion and modification; (c) support for object instance migration so as to partition the set of class instances into multiple classes; (d) support for managing practical deletion of portions of a model; (e) explicit specification and automatic management of integrity between a building model and various views. The rationale and language features, and in some cases, the implementation strategy for the features, are presented.
series	journal paper
more	http://www.elsevier.com/locate/autcon
last changed	2003/05/15 21:22

_id	8c06
authors	Eastman, C.M.
year	1999
title	Building Product Models
source	CRC Press, NewYork
summary	Presents the concepts, technology, and methods used to develop a new, digital representation for architecture, civil engineering, and building construction. Eastman (architecture and computing, Georgia Institute of Technology) introduces and explains ISO-STEP and the Industry Foundation Classes, as well as reviewing modeling concepts, supporting technologies, and standards. He uses numerous examples and figures, making this book both accessible as a text for graduate students, and as a reference for professionals in the fields of real estate, building, and software development.
series	other
email
last changed	2003/04/23 15:14

_id	1d4e
authors	Engeli, Maia and Miskiewicz-Bugajski, Malgorzata
year	1999
title	A Collectively Designed Information Landscape
source	AVOCAAD Second International Conference [AVOCAAD Conference Proceedings / ISBN 90-76101-02-07] Brussels (Belgium) 8-10 April 1999, pp. 47-59
summary	Information Landscape is one of several courses in which we explore the potential of networked environments to support creative, collaborative design processes. 180 architecture students of the first semester are participating in this course. They work in pairs. The design of an "Information Landscape" is the goal, it is a virtual terrain that is formed by the participants over time and has landmarks that lead to specific information. The location and visual appearance of the more than 400 landmarks help to remember which information is connected to them. The design of the landscape happens in five steps and is related to the tasks in the architectural design class. The collectively designed product can reach qualities beyond the possible achievements of a single person. An environment that supports such design goals must provide for motivation, transparency and support. The common product has to include a tolerance towards fluctuations in the quality of the contributions.
series	AVOCAAD
email
last changed	2005/09/09 10:48

_id	5377
authors	Frazer, J.H., Tang, M.X. and Jian, S.
year	1999
title	Towards a Generative System for Intelligent Design Support
source	CAADRIA '99 [Proceedings of The Fourth Conference on Computer Aided Architectural Design Research in Asia / ISBN 7-5439-1233-3] Shanghai (China) 5-7 May 1999, pp. 285-294
doi	https://doi.org/10.52842/conf.caadria.1999.285
summary	In the development of intelligent computer aided design systems, three important issues need to considered. These issues are: how to support the generation of product concepts using evolutionary computation techniques; how to use intelligent databases and constraint management systems for detailed exploration of product embodiment; and how to integrate rapid prototyping facilities for product evaluation. In this paper, we present a brief review of knowledge based design and evolutionary design and discuss ways of integrating both in the development of a generative design system. Based on this review, we present the model and its applications of a generative design system utilizing a number of AI and evolutionary computation techniques. This generative design model is intended to provide a generic computational framework for the development of intelligent design support systems.
series	CAADRIA
email
last changed	2022/06/07 07:50

_id	993c
authors	Fruchter, Renate
year	1999
title	A/E/C Teamwork: A Collaborative Design and Learning Space
source	Journal of Computing in Civil Engineering -- October 1999 -- Volume 13, Issue 4, pp. 261-269
summary	This paper describes an ongoing effort focused on combined research and curriculum development for multidisciplinary, geographically distributed architecture/engineering/construction (A/E/C) teamwork. Itpresents a model for a distributed A/E/C learning environment and an Internet-based Web-mediated collaboration tool kit. The distributed learning environment includes six universities from Europe, Japan, andthe United States. The tool kit is aimed to assist team members and owners (1) capture and share knowledge and information related to a specific project; (2) navigate through the archived knowledge andinformation; and (3) evaluate and explain the product's performance. The A/E/C course offered at Stanford University acts as a testbed for cutting-edge information technologies and a forum to teach newgenerations of professionals how to team up with practitioners from other disciplines and take advantage of information technology to produce a better, faster, more economical product. The paper presents newassessment metrics to monitor students' cross-disciplinary learning experience and track programmatic changes. The paper concludes with challenges and quandaries regarding the impact of informationtechnologies on team performance and behavior.
series	journal paper
last changed	2003/05/15 21:45

_id	b9d3
authors	Galán, B., Argumedo, C. and Paganini, A.
year	1999
title	Possibilities of the Computer for the Simulation of the Designer's Constructive Strategies
source	III Congreso Iberoamericano de Grafico Digital [SIGRADI Conference Proceedings] Montevideo (Uruguay) September 29th - October 1st 1999, pp. 74-78
summary	The dynamic analysis (prospective), of products and systems, it is a methodological resource of the design that allows synthetically, and with great economy of investigation resources and time, to put in evidence the tendencies in the evolution of the object. Finally, the design strategies are defined as postures in front of these tendencies of evolution of the significant variables in the cycle of the product. Having as theoretical context the theory of systems,we explored the dynamic analysis of products and systems, taking their evolution along a temporary series that embraces a complete cycle, from the birth of the object until their maturation in the period of saturation of the market. Starting from the analysis of the evolution of the diverse subsystems, and the conflicts among the world of the necessities, (as pressure exercised from the context), and the technical agreement, it shows the evolutionary dynamics,the underlying conflicts to the logic of the system for each product. They are revealed to the design like a cultural operation that should keep in mind the processes of transformation of the mental representations of the object whose evolution should respect certain rules for its as, clearly such as the well-known maya threshold, (most advanced, yet accepted).
series	SIGRADI
email
last changed	2016/03/10 09:52

_id	ca7b
authors	Howes, Jaki
year	1999
title	IT or not IT? An Examination of IT Use in an Experimental Multi-disciplinary Teamwork Situation
source	Architectural Computing from Turing to 2000 [eCAADe Conference Proceedings / ISBN 0-9523687-5-7] Liverpool (UK) 15-17 September 1999, pp. 370-373
doi	https://doi.org/10.52842/conf.ecaade.1999.370
summary	Leeds Metropolitan University is well placed to carry out research into multi-disciplinary team-working, as all the design and construction disciplines are housed in one faculty. Staff have set up an experimental project, TIME IT (Team-working in Multi-disciplinary Environments using IT) which examines ways of working in the design/construction process and how IT is used when there is no commercial pressure. Four groups of four students, one graduate diploma architect, and one final year student from each of Civil Engineering, Construction Management and Quantity Surveying have been working on feasibility studies for projects that are based on completed schemes or have been devised by collaborators in the Construction Industry. Students have been asked to produce a PowerPoint presentation, in up to five working days, of a design scheme, with costs, structural analysis and construction programme. The students are not assessed on the quality of the product, but on their own ability to monitor the process and use of IT. Despite this, aggressive competition evolved between the teams to produce the 'best' design. Five projects were run in the 1998/99 session. A dedicated IT suite has been provided; each group of students had exclusive use of a machine. They were not told how to approach the projects nor when to use the available technology, but were asked to keep the use of paper to a minimum and to keep all their work on the server, so that it could be monitored externally. Not so. They plotted the AO drawings of an existing building that had been provided on the server. They like paper - they can scribble on it, fold it, tear it and throw it at one another.
keywords	IT, Multi-disciplinary, Teamwork
series	eCAADe
email
last changed	2022/06/07 07:50

_id	f44f
authors	Huang, Ying-Hsiu
year	2000
title	Investigating the Cognitive Behavior of Generating Idea Sketches. Neural Network Simulation
source	CAADRIA 2000 [Proceedings of the Fifth Conference on Computer Aided Architectural Design Research in Asia / ISBN 981-04-2491-4] Singapore 18-19 May 2000, pp. 287-296
doi	https://doi.org/10.52842/conf.caadria.2000.287
summary	In idea sketches, there are a number of ambiguous shapes. Designers will associate and transform some shapes into others (Liu, 1993). Then, they evaluate these shapes in terms of functions and design requirements; furthermore, they would have generated other shapes that certified the design requirements (Huang, 1999). However, not only is the idea of design composed of one element, but also consisted of varied components. The purpose of this paper is to investigate how designers generate ideas of multi-component products, and to simulate this phenomenon by neural networks. At the same time, this paper attempts to study the design cognitive behavior of idea-generating stages, and explores the designers' cognitive phenomenon. Therefore, there are two stages in this paper: First, I conduct a cognitive experiment to realize how designers generate the multi-component product and acquire the sketches that designers generated. Second, I train the neural networks to simulate the behavior of idea generation and explore the cognitive phenomenon in design sketches. As a result, networks associate one shape that trained before, and then generate a complete idea. This phenomenon is similar to the cognitive behavior of designers who saw the ambiguous shape as one shape, which was retrieved from LTM. Moreover, the neural network is examined by a rectangle, which is totally different from the training patterns. The network will associate a confused shape. But the network will associate different shapes by adjusting some critical parameters. Designers can generate variable shapes from one shape, but the signal neural network can't simulate this kind of behavior. On the contrary, this paper proposes five sequential networks to generate variable shapes from the same shape and simulates how designers develop ideas.
series	CAADRIA
email
last changed	2022/06/07 07:49

_id	avocaad_2001_22
id	avocaad_2001_22
authors	Jos van Leeuwen, Joran Jessurun
year	2001
title	XML for Flexibility an Extensibility of Design Information Models
source	AVOCAAD - ADDED VALUE OF COMPUTER AIDED ARCHITECTURAL DESIGN, Nys Koenraad, Provoost Tom, Verbeke Johan, Verleye Johan (Eds.), (2001) Hogeschool voor Wetenschap en Kunst - Departement Architectuur Sint-Lucas, Campus Brussel, ISBN 80-76101-05-1
summary	The VR-DIS research programme aims at the development of a Virtual Reality – Design Information System. This is a design and decision support system for collaborative design that provides a VR interface for the interaction with both the geometric representation of a design and the non-geometric information concerning the design throughout the design process. The major part of the research programme focuses on early stages of design. The programme is carried out by a large number of researchers from a variety of disciplines in the domain of construction and architecture, including architectural design, building physics, structural design, construction management, etc.Management of design information is at the core of this design and decision support system. Much effort in the development of the system has been and still is dedicated to the underlying theory for information management and its implementation in an Application Programming Interface (API) that the various modules of the system use. The theory is based on a so-called Feature-based modelling approach and is described in the PhD thesis by [first author, 1999] and in [first author et al., 2000a]. This information modelling approach provides three major capabilities: (1) it allows for extensibility of conceptual schemas, which is used to enable a designer to define new typologies to model with; (2) it supports sharing of conceptual schemas, called type-libraries; and (3) it provides a high level of flexibility that offers the designer the opportunity to easily reuse design information and to model information constructs that are not foreseen in any existing typologies. The latter aspect involves the capability to expand information entities in a model with relationships and properties that are not typologically defined but applicable to a particular design situation only; this helps the designer to represent the actual design concepts more accurately.The functional design of the information modelling system is based on a three-layered framework. In the bottom layer, the actual design data is stored in so-called Feature Instances. The middle layer defines the typologies of these instances in so-called Feature Types. The top layer is called the meta-layer because it provides the class definitions for both the Types layer and the Instances layer; both Feature Types and Feature Instances are objects of the classes defined in the top layer. This top layer ensures that types can be defined on the fly and that instances can be created from these types, as well as expanded with non-typological properties and relationships while still conforming to the information structures laid out in the meta-layer.The VR-DIS system consists of a growing number of modules for different kinds of functionality in relation with the design task. These modules access the design information through the API that implements the meta-layer of the framework. This API has previously been implemented using an Object-Oriented Database (OODB), but this implementation had a number of disadvantages. The dependency of the OODB, a commercial software library, was considered the most problematic. Not only are licenses of the OODB library rather expensive, also the fact that this library is not common technology that can easily be shared among a wide range of applications, including existing applications, reduces its suitability for a system with the aforementioned specifications. In addition, the OODB approach required a relatively large effort to implement the desired functionality. It lacked adequate support to generate unique identifications for worldwide information sources that were understandable for human interpretation. This strongly limited the capabilities of the system to share conceptual schemas.The approach that is currently being implemented for the core of the VR-DIS system is based on eXtensible Markup Language (XML). Rather than implementing the meta-layer of the framework into classes of Feature Types and Feature Instances, this level of meta-definitions is provided in a document type definition (DTD). The DTD is complemented with a set of rules that are implemented into a parser API, based on the Document Object Model (DOM). The advantages of the XML approach for the modelling framework are immediate. Type-libraries distributed through Internet are now supported through the mechanisms of namespaces and XLink. The implementation of the API is no longer dependent of a particular database system. This provides much more flexibility in the implementation of the various modules of the VR-DIS system. Being based on the (supposed to become) standard of XML the implementation is much more versatile in its future usage, specifically in a distributed, Internet-based environment.These immediate advantages of the XML approach opened the door to a wide range of applications that are and will be developed on top of the VR-DIS core. Examples of these are the VR-based 3D sketching module [VR-DIS ref., 2000]; the VR-based information-modelling tool that allows the management and manipulation of information models for design in a VR environment [VR-DIS ref., 2000]; and a design-knowledge capturing module that is now under development [first author et al., 2000a and 2000b]. The latter module aims to assist the designer in the recognition and utilisation of existing and new typologies in a design situation. The replacement of the OODB implementation of the API by the XML implementation enables these modules to use distributed Feature databases through Internet, without many changes to their own code, and without the loss of the flexibility and extensibility of conceptual schemas that are implemented as part of the API. Research in the near future will result in Internet-based applications that support designers in the utilisation of distributed libraries of product-information, design-knowledge, case-bases, etc.The paper roughly follows the outline of the abstract, starting with an introduction to the VR-DIS project, its objectives, and the developed theory of the Feature-modelling framework that forms the core of it. It briefly discusses the necessity of schema evolution, flexibility and extensibility of conceptual schemas, and how these capabilities have been addressed in the framework. The major part of the paper describes how the previously mentioned aspects of the framework are implemented in the XML-based approach, providing details on the so-called meta-layer, its definition in the DTD, and the parser rules that complement it. The impact of the XML approach on the functionality of the VR-DIS modules and the system as a whole is demonstrated by a discussion of these modules and scenarios of their usage for design tasks. The paper is concluded with an overview of future work on the sharing of Internet-based design information and design knowledge.
series	AVOCAAD
email
last changed	2005/09/09 10:48

_id	1121
authors	Kalay, Yehuda E.
year	1999
title	The Future of CAAD: From Computer-aided Design to Computer-aided Collaboration
source	Proceedings of the Eighth International Conference on Computer Aided Architectural Design Futures [ISBN 0-7923-8536-5] Atlanta, 7-8 June 1999, pp. 14-30
summary	The primary uses of computers in the construction industry have been shifting, over the past four decades, from the evaluation of proposed design solutions, to their graphical (and other) representation, and more recently to facilitating collaboration among the various professionals who are involved in the design process. The paper argues that what may appear to be shifts in emphasis actually represents convergence on a single, original goal: the use of computers to help designers assess the quality, desirability, and the implications of their creations. The paper shows how the formerly independent components can be joined into an integrated collaborative design environment, where they build upon and strengthen each other. Moreover, the paper argues that this convergence represents the future of CAAD research and development, providing the appropriate answer to the upcoming needs of the construction industry, whose products have become too complex and must abide by too many requirements for any one professional to handle all by himself. The paper argues that further improvements in the overall quality of the products, and the process of their design, will only accrue when the heretofore separate solutions are considered together, as integral parts of an overall solution. The paper describes the efforts that have been made by the CAD Research Group in Berkeley over the past six years in developing an integrated collaborative design environment that can facilitate multidisciplinary, a- synchronous design of buildings. The environment includes several semantically-rich, shared product representations, a network of distributed evaluators, and graphically enhanced collaboration and negotiation tools.
keywords	Collaborative Design, Distributed Design Environment, Product Modeling, Performance Modeling, Process Modeling, Negotiation, Integration
series	CAAD Futures
email
last changed	2006/11/07 07:22

_id	221d
authors	Lee, Sanghyun
year	1999
title	Internet-based collaborative design evaluation : an architect's perspective
source	Harvard University
summary	This research aims at developing a design evaluation system that employs a Product Model as the logical basis for integrating building design and construction processes. The system is implemented with Java language, which allows the system to work over the Internet. Accordingly, the system helps architects to collaborate with remote participants. Thus, this design evaluation system is a building performance evaluator like DOE-2, RADIANCE, HVAC, and the Automated Building Code Checker. This research, however, is mainly concerned with an architect's view during the schematic design and design development stage, while the existing design evaluation systems cover other special consultants' views such as those of HVAC designers, structural engineers, and contractors. From an architect's view, this evaluation system checks the compliance of design objects represented by means of physical objects such as walls and windows and conceptual objects such as rooms as well, to the design criteria focused on accommodating human behavior, rather than other building performances such as sustaining building structures and maintaining indoor livability. As such, the system helps designers analyze and evaluate design solutions according to their original intent. The innovative points of this research lie in the following: (1) Unlike other inquiries, it addresses a systematic evaluation of building design from an architect's view focusing on the experiential quality of the built environment. This research demonstrates that such an evaluation becomes available by introducing human activity-based evaluation. (2) It can take a multi-agenda for several groups of different interests by providing an Aspect Model based on human activity-centered systematic translation of their design considerations and 3D model-based graphical representations into system readable ones. (3) As a result, it addresses the possibility of expanding the capability of the design evaluator from a mere code checker to a general design evaluator while simultaneously, enhancing the availability from stand alone to Internet based networking.
keywords	Architectural Rendering; Data Processing; Evaluation; Buildings; Performance; World Wide Web; Internet
series	thesis:PhD
last changed	2003/02/12 22:37

_id	9c00
authors	Maher, M. and Simmoff, S.
year	1999
title	Variations on the Virtual Design Studio
source	Proceedings of Computer-Supported Collaborative Work in Design
summary	There are numerous approaches and techniques for setting up an environment for collaborative design. The most common approach is to extend the desktop environment to include tools for meeting and sharing files. This approach takes the individual work environment and adds tools for communicating with others. An alternative approach is to create a virtual world environment in which the collaborators meet, work, and organise their projects. This approach differs conceptually because it creates a sense of place that is unique to the project, sort of a shared office space. A variation on this approach is to create a virtual world that is the model of the product being designed. This is a more obvious choice when the product is an architectural design, but it can be extended to other kinds of design. This approach is essentially collaborating within the design. We present the three approaches and comment on their strengths and weaknesses.
series	other
last changed	2003/04/23 15:50

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