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	89e4
authors	Cendes, Z.J., Shenton, D. and H. Shahnasser
year	1982
title	Adaptive Finite Element Mesh Generation Using the Delaunay Algorithm
source	3 p. : ill. Pittsburgh: Design Research Center, CMU, December, 1982
summary	Includes bibliography. A two-dimensional generator is described which automatically creates optimal finite element meshes using the Delaunay triangulation algorithm. The mesh generator is adaptive in the sense that elements containing the largest normalized errors are automatically refined, providing meshes with a uniform error density. The system runs on a PERQ computer made by Three Rivers Computer Company. It is menu oriented and utilizes multiple command and display windows to create and edit the object description interactively. Mesh generation from the object data base is automatic, although it may be modified interactively by the user if desired. Application of the mesh generator to electric machine design and to magnetic bubble simulation shows it to be one of the most powerful and easy to use systems yet devised
keywords	electrical engineering, triangulation, algorithms, OOPS, finite elements, analysis
series	CADline
last changed	2003/06/02 13:58

_id	4eb7
authors	Kirsch, Uri
year	1982
title	Optimal Design of Continuous Prestressed Concrete Structures
source	25 p. : il. tables Pittsburgh, PA: Design Research Center, CMU, December, 1982. DRC-12-11-82. includes bibliography: p. 20-21
summary	Optimal design of continuous prestressed systems is stated in a nonlinear programming form. The design variables are the concrete dimensions, tendon coordinates, and prestressing force. The constraints are related to various behavior and design requirements and the objective function represents the overall cost. Some simplified models, intended to improve the solution efficiency, are presented. These include: explicit formulations of the general problem and the problem of minimizing the concrete dimensions; linear programming formulation of the tendon configuration and prestressing force optimization; and direct determination of the prestressing force for given concrete dimensions and tendon coordinates. Some examples illustrate the various problem formulations and solution methodology
keywords	engineering, structures, optimization, linear programming
series	CADline
last changed	1999/02/12 15:08

_id	29bb
authors	Fix, George J. and Ernst, Stephan
year	1982
title	Finite Element Methods of the Least Squares Type for Regions with Corners
source	15 p. : ill Pittsburgh: Design Research Center, CMU, April, 1982. includes bibliography.
summary	This paper treats problems with corner singularities. It is shown that if appropriate weights are used in the least squares formulation, then optimal error estimates can be derived in unweighted L2 norms
keywords	computational geometry, finite elements, mathematics
series	CADline
last changed	2003/06/02 13:58

_id	1b10
id	1b10
authors	Bay, Joo-Hwa
year	2001
title	Cognitive Biases - The case of tropical architecture
source	Delft University of Technology
summary	This dissertation investigates, i) How cognitive biases (or illusions) may lead to errors in design thinking, ii) Why architects use architectural precedents as heuristics despite such possible errors, and iii) Develops a design tool that can overcome this type of errors through the introduction of a rebuttal mechanism. The mechanism controls biases and improves accuracy in architectural thinking. // The research method applied is interdisciplinary. It employs knowledge from cognitive science, environmental engineering, and architectural theory. The case study approach is also used. The investigation is made in the case of tropical architecture. The investigation of architectural biases draws from work by A. Tversky and D. Kahneman in 1982 on “Heuristics and biases”. According to Tversky and Kahneman, the use of heuristics of representativeness (based on similarity) and availability (based on ease of recall and imaginability) for judgement of probability can result in cognitive biases of illusions of validity and biases due to imaginability respectively. This theory can be used analogically to understand how errors arise in the judgement of environmental behaviour anticipated from various spatial configurations, leading to designs with dysfunctional performances when built. Incomplete information, limited time, and human mental resources make design thinking in practice difficult and impossible to solve. It is not possible to analyse all possible alternative solutions, multiple contingencies, and multiple conflicting demands, as doing so will lead to combinatorial explosion. One of the ways to cope with the difficult design problem is to use precedents as heuristic devices, as shortcuts in design thinking, and at the risk of errors. This is done with analogical, pre-parametric, and qualitative means of thinking, without quantitative calculations. Heuristics can be efficient and reasonably effective, but may not always be good enough or even correct, because they can have associated cognitive biases that lead to errors. Several debiasing strategies are discussed, and one possibility is to introduce a rebuttal mechanism to refocus the designer’s thinking on the negative and opposite outcomes in his judgements, in order to debias these illusions. The research is carried out within the framework of design theory developed by the Design Knowledge System Research Centre, TUDelft. This strategy is tested with an experiment. The results show that the introduction of a rebuttal mechanism can debias and improve design judgements substantially in environmental control. The tool developed has possible applications in design practice and education, and in particular, in the designing of sustainable environments.
keywords	Design bias; Design knowledge; Design rebuttal; Design Precedent; Pre-parametric design; Tropical architecture; Sustainability
series	thesis:PhD
type	normal paper
email
last changed	2006/05/28 07:42

_id	0650
authors	Fenves, Stephen J. and Rasdorf, William J.
year	1982
title	Role of Database Management Systems in Structural Engineering
source	15 p.: ill Pittsburgh: Design Research Center, CMU, December, 1982. includes bibliography.
summary	--- Presented at International Association of Bridge and Structural Engineers Symposium on Informatics in Structural Engineering.(1982 : Bergamo, Italy). The future integration of structural engineering application programs will depend critically on integrated databases which provide access to information in essentially arbitrary sequences, and which automatically perform a large portion of integrity checking on the data. One source of such design databases are the database management systems (DBMS) evolving from management applications. The paper surveys such systems and presents some extensions needed
keywords	integration, database, DBMS, systems, civil engineering
series	CADline
last changed	2003/06/02 10:24

_id	8d70
authors	Fenves, Stephen J.
year	1982
title	A Note on Flow Networks and Structures
source	Pittsburgh: Design Research Center, CMU, April, 1982. 7, [11] p. : ill
summary	The purpose of this note is to explore certain common features of flow and structural networks, in terms of the effect of the (usually implicit) global equilibrium equations on the range of problems amenable to analysis. The objective is to extend the standard analysis problem and explore the possibility of 'tuning' flow and structural networks by preassigning values of certain inflow and reaction components
keywords	networks, civil engineering, structures, analysis
series	CADline
last changed	2003/06/02 10:24

_id	e323
authors	Holtz, Neal M. and Rasdorf, William J.
year	1982
title	The Use of LISP for Computer-Aided Design Systems
source	18, [19] p. Pittsburgh: Design Research Center, Carnegie-Mellon University, April, 1982. includes bibliography
summary	It is suggested that the LISP programming language has many advantages and few disadvantages for use in developing complex engineering application programs. The paper attempts to explore that possibility by briefly explaining a few of the concepts of the language, by discussing some of the criticisms of it, and by mentioning some new developments. In summary it is suggested that LISP may currently be the best programming language to use for the development of computer- aided design (CAD) systems
keywords	LISP, CAD, systems, programming, languages, CAE, engineering
series	CADline
last changed	2003/06/02 13:58

_id	c6e3
authors	Kirsch, Uri
year	1982
title	Approximation Concepts for Optimum Structural Design
source	25 p. Pittsburgh, PA: Design Research Center, CMU, December, 1982. DRC-12-12-82. includes bibliography
summary	When elastic behavior is assumed, the optimum structural design problem is stated in an implicit nonlinear programming form. Approximate behavior models are introduced to obtain explicit constraint functions, essential in many practical design problems. For the displacement analysis formulation, some possible explicit approximations of the nodal displacements in terms of the design variables are reviewed. It is shown that any approximation of the displacements will lead to a solution which does not necessarily satisfy equilibrium. Methods for solving the approximate problem are discussed. Using the force analysis formulation, it is shown that explicit approximations of the redundant forces will lead to solutions which do not necessarily satisfy compatibility. Some simplified models of the explicit problem are presented and solution methods are discussed
keywords	structures, design, engineering, optimization, civil engineering, approximation
series	CADline
last changed	1999/02/12 15:08

_id	46bd
authors	Nestor, J. A. and Thomas, Donald E.
year	1982
title	Defining and Implementing a Multilevel Design Representation with Simulation Applications
source	Design Research Center, CMU, December, 1982. [7] p. includes bibliography
summary	A design representation that incorporates descriptions at more than one level of abstraction is called a multilevel representation. This paper describes a multilevel representation which includes behavioral and structural levels of description, and a multilevel analysis aid, called timing abstraction, which extracts timing information from a structural design and adds it to a behavior level description. With this design aid, alternate implementations of the same behavior, generated using the CMU-DA synthesis software, can be compared using a behavior level simulator. The timing accuracy is that of the microcode implementation, while the speed of the simulation is that of a behavior level simulator
keywords	representation, design, CAD, automation, simulation, electrical engineering, integrated circuits
series	CADline
last changed	2003/06/02 13:58

_id	cc3e
authors	Bloom, Gregory L.
year	1982
title	Solving Architectural and Engineering Problems with CADD: Some Guidelines in Choosing the Right System
source	computer Graphics News. September/October 1982. [3] p
summary	To be useful, a CAD system intended for architectural engineering work must have a number of characteristics in addition to appropriate hardware or software. The article discusses some of these guidelines
keywords	CAD, engineering, architecture, practice
series	CADline
last changed	2003/06/02 13:58

_id	0107
authors	Akin, Omer and Weinel, Eleanor F. (editors)
year	1982
title	Representation and Architecture
source	v, 285 p. : ill. Silver Spring, Maryland: Information Dynamics, Inc., 1982
summary	A collection of papers developed from the proceeding of the Northeastern Regional meeting of the Association of Collegiate Schools of Architecture (ACSA), held at the Department of Architecture, Carnegie Mellon University. The introduction includes articles about representation, representation and architecture. Part 1, Who/To Whom speaks about representation and participatory design process, and of a system for recording behavior and occupying of design. Part 2, How: includes Figure, System and Memory, the Process of Design ; Representation and Creativity in Architecture and Miniature Substitutes. Part 3, With What :Information and Data Base in Design : the Computer as a Design Medium, Slides Talk and Translation
keywords	design process, representation, architecture, creativity
series	CADline
email
last changed	2003/05/17 10:09

_id	2045
authors	Balas, Egon
year	1982
title	A Class of Location, Distribution and Scheduling Problems : Modeling and Solution Methods
source	21 p., 8 + 4 p. of appendix : ill. Carnegie Mellon University, Pittsburgh, PA: Design Research Center, December, 1982. includes bibliography
summary	Discusses the potential of set covering techniques. Illustrates problem formulation techniques on several important classes of real-world problems. Also describes a class of algorithms for solving set covering problems, based on cutting planes, heuristics and subgradient optimization
keywords	problem solving, methods, algorithms, problem definition, modeling, optimization, operations research
series	CADline
last changed	1999/02/12 15:07

_id	a426
authors	Barsky, Brian A. and Greenberg, Donald P.
year	1982
title	Interactive Surface Representation System Using a B-spline Formulation with Interpolation Capability
source	computer Aided Design. July, 1982. vol. 14: pp. 187-194 : col.ill. includes bibliography
summary	An interactive surface representation system is described which uses a parametric uniform bicubic B-spline formulation which can describe a surface initially defined to interpolate a specified network of points
keywords	CAD, curved surfaces, computational geometry, interpolation, B-splines
series	CADline
last changed	2003/06/02 13:58

_id	898a
authors	Bay, J.H.
year	2002
title	Cognitive Biases and Precedent Knowledge in Human and Computer-Aided Design Thinking
doi	https://doi.org/10.52842/conf.caadria.2002.213
source	CAADRIA 2002 [Proceedings of the 7th International Conference on Computer Aided Architectural Design Research in Asia / ISBN 983-2473-42-X] Cyberjaya (Malaysia) 18–20 April 2002, pp. 213-220
summary	Cognitive biases (illusions) and potential errors can occur when using precedent knowledge for analogical, pre-parametric and qualitative design thinking. This paper refers largely to part of a completed research (Bay 2001) on how heuristic biases, discussed by Tversky and Kahneman (1982) in cognitive psychology, can affect judgement and learning of facts from precedents in architectural design, made explicit using a kernel of conceptual system (Tzonis et. al., 1978) and a framework of architectural representation (Tzonis 1992). These are used here to consider how such illusions and errors may be transferred to computer aided design thinking.
series	CAADRIA
email
last changed	2022/06/07 07:54

_id	cf2003_m_040
id	cf2003_m_040
authors	BAY, Joo-Hwa
year	2003
title	Making Rebuttals Available Digitally for Minimising Biases in Mental Judgements
source	Digital Design - Research and Practice [Proceedings of the 10th International Conference on Computer Aided Architectural Design Futures / ISBN 1-4020-1210-1] Tainan (Taiwan) 13–15 October 2003, pp. 147-156
summary	The problem of heuristic biases (illusions) discussed by Tversky and Kahneman (1982) that can lead to errors in judgement by human designers, when they use precedent knowledge presented graphically (Bay 2001). A Cognitive framework of belief, goal, and decision, and a framework of representation of architectural knowledge by Tzonis are used to map out the problem of heuristic biases in the human mind. These are used to discuss what aspects of knowledge can be presented explicitly and digitally to users to make rebuttal more available for human thinking at the cognitive level. The discussion is applicable to both inductive and analytic digital knowledge systems that use precedent knowledge. This discussion is targeted directly at means of addressing bias in the human mind using digital means. The problem of human bias in machine learning and generalisation are discussed in a different paper, and the problems of international or non-intentional machine bias are not part of discussion in this paper.
keywords	analogy, bias, design thinking, environmental design, heuristics
series	CAAD Futures
last changed	2003/11/22 07:26

_id	eabb
authors	Boeykens, St. Geebelen, B. and Neuckermans, H.
year	2002
title	Design phase transitions in object-oriented modeling of architecture
doi	https://doi.org/10.52842/conf.ecaade.2002.310
source	Connecting the Real and the Virtual - design e-ducation [20th eCAADe Conference Proceedings / ISBN 0-9541183-0-8] Warsaw (Poland) 18-20 September 2002, pp. 310-313
summary	The project IDEA+ aims to develop an “Integrated Design Environment for Architecture”. Its goal is providing a tool for the designer-architect that can be of assistance in the early-design phases. It should provide the possibility to perform tests (like heat or cost calculations) and simple simulations in the different (early) design phases, without the need for a fully detailed design or remodeling in a different application. The test for daylighting is already in development (Geebelen, to be published). The conceptual foundation for this design environment has been laid out in a scheme in which different design phases and scales are defined, together with appropriate tests at the different levels (Neuckermans, 1992). It is a translation of the “designerly” way of thinking of the architect (Cross, 1982). This conceptual model has been translated into a “Core Object Model” (Hendricx, 2000), which defines a structured object model to describe the necessary building model. These developments form the theoretical basis for the implementation of IDEA+ (both the data structure & prototype software), which is currently in progress. The research project addresses some issues, which are at the forefront of the architect’s interest while designing with CAAD. These are treated from the point of view of a practicing architect.
series	eCAADe
email
last changed	2022/06/07 07:52

_id	b47b
authors	Callender, John Hancock (Ed.)
year	1982
title	Time Saver Standards for Architectural Design Data
source	McGraw Hill Book. Co., Sixth Ed.
summary	From Book News, Inc. The latest version of the venerable reference first published in 1946 and most recently in 1982. Considers such aspects as bioclimate design, life-cycle costing, the building shell, architectural ethics, superstructure, acoustics, construction materials technology, daylighting, environmentally responsible design, and evaluating building performance. A special section features design data formatted according to the Uniformat II classification system, offering easy access to preliminary design and specification by building component, assemble, and place in the system of construction. Useful for any professional in the architecture, design, or construction fields. Book News, Inc.(r), Portland. Book Description Our biggest database of ready-to-use architectural design details ever. A classic reference for over 50 years. Time-Saver Standards for Architectural Design Data, edited by Donald Watson, Michael J. Crosbie, and John Hancock Callender, is the all-in-one desktop database that helps you work faster and smarter with instant design details-ready to incorporate into your architectural drawings the moment you need them. Now in a completely revised and updated seventh edition, this time-saving resource...
series	other
last changed	2003/04/23 15:14

_id	8239
authors	Campello, Ruy Eduardo and Maculan, Nelson
year	1982
title	On Deep Disjunctive Cutting Planes for Set Partitioning : A Computationally Oriented Research.
source	Pittsburgh: Design Research Center, CMU [DRC-70-11-82], 10 p.
summary	Several mathematical programming problems can be formulated as Disjunctive Programming Problems. This approach offers a powerful procedure for the generation of new and strong cutting planes with desirable properties. For general integer programs, the traditional cutting plane methodologies proved less efficient than enumerative techniques. However, for certain classes of problems, such as set partitioning, cutting planes are known to be efficient. Since the disjunctive cuts are strong, they can be expected to perform better. This paper reports on computational results with disjunctive B(.) cuts for the set partitioning problem, evaluated in terms of computer resources and other independent measures in solving specific randomly generated test problems under controlled conditions. [includes bibliography].
keywords	Mathematics, Operations Research, Integer Programming, Optimization
series	CADline
last changed	1999/02/15 15:17

_id	66df
authors	Cendes, Z.J., Minhas, F.U. and Silvester, P.P.
year	1982
title	Universal Finite Element Matrices for Tetrahedra
source	45, [22] p Pittsburgh: Design Research Center, CMU, December, 1982. DRC- 18-58-82. includes bibliography.
summary	Methods are described for forming finite element matrices for a wide variety of operators on tetrahedral finite elements, in a manner similar to that previously employed for line segments and triangles. This technique models the differentiation and product-embedding operators as rectangular matrices, and produces finite element matrices by replacing all required analytic operations by their finite matrix analogues. The method is illustrated by deriving the conventional matrix representation for Laplace's equation. Brief computer programs are given, which generate universal finite element matrices for use in various applications
keywords	mathematics, computational geometry, finite elements, analysis
series	CADline
last changed	2003/06/02 13:58

_id	4b04
authors	De Wilde, W.P., Mollaert, M. and Buelinckx, H. (Ed.)
year	1983
title	Proceedings of the International Conference eCAADe 1983
doi	https://doi.org/10.52842/conf.ecaade.1983
source	Proceedings of the International Conference eCAADe [European Computer Aided Architectural Design Education] Brussels (Belgium) 1983
summary	In the beginning of the eighties, a few enthusiastic researchers, under the impulsion of Tom MAVER (director of the ABACUS group) and Rik SCHIJF (TH Delft) initiated a regular, if not formal, convention of people involved in the teaching of computer aided architectural design ECAADE in Europe. In 1982 a first meeting took place in Delft and, taking into consideration the member of attendants and the enthusiasm during this convention, it was decided that CAAD was definitely an important topic and that a more formal symposium was to be organised in the fall of 1983, in the University of Brussels. The positive evolution of CAAD, not only in educational institutions, but also in professional practice is not surprising: it is to be considered in the global frame of technological and organisational revolution actually taking place. As will be read in the outstanding contribution of the participants it is not a mere choice of increased productivity which attracts the architects; the CAAD techniques also release then from a serious burden : the production of technical drawings and administrative paperwork!
series	eCAADe
email
more	http://wwwtw.vub.ac.be/ond/memc/Staff/Patrick.htm
last changed	2022/06/07 07:49

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