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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	e118
authors	Balas, Egon
year	1983
title	Disjunctive Programming and a Hierarchy of Relaxations for Discrete Optimization Problems
source	December, 1983. 38 p. : ill. includes bibliography
summary	The author discuss a new conceptual framework for the convexification of discrete optimization problems, and a general technique for obtaining approximations to the convex hull of the feasible set. The concepts come from disjunctive programming and the key tool is a description of the convex hull of a union of polyhedra in terms of a higher dimensional polyhedron. Although this description was known for several years, only recently was it shown by Jeroslow and Lowe to yield improved representations of discrete optimization problems. The author expresses the feasible set of a discrete optimization problem as the intersection (conjunction) of unions of polyhedra, and define an operation that takes one such expression into another, equivalent one, with fewer conjuncts. He then introduces a class of relaxations based on replacing each conjunct (union of polyhedra) by its convex hull. The strength of the relaxations increases as the number of conjuncts decreases, and the class of relaxations forms a hierarchy that spans the spectrum between the common linear programming relaxation, and the convex hull of the feasible set itself. Instances where this approach presents advantages include critical path problems in disjunctive graphs, network synthesis problems, certain fixed charge network flow problems, etc. The approach on the first of these problems is illustrated, which is a model for machine sequencing
keywords	polyhedra, computational geometry, optimization, programming, convex hull, graphs
series	CADline
last changed	1999/02/12 15:07

_id	avocaad_2001_02
id	avocaad_2001_02
authors	Cheng-Yuan Lin, Yu-Tung Liu
year	2001
title	A digital Procedure of Building Construction: A practical project
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	In earlier times in which computers have not yet been developed well, there has been some researches regarding representation using conventional media (Gombrich, 1960; Arnheim, 1970). For ancient architects, the design process was described abstractly by text (Hewitt, 1985; Cable, 1983); the process evolved from unselfconscious to conscious ways (Alexander, 1964). Till the appearance of 2D drawings, these drawings could only express abstract visual thinking and visually conceptualized vocabulary (Goldschmidt, 1999). Then with the massive use of physical models in the Renaissance, the form and space of architecture was given better precision (Millon, 1994). Researches continued their attempts to identify the nature of different design tools (Eastman and Fereshe, 1994). Simon (1981) figured out that human increasingly relies on other specialists, computational agents, and materials referred to augment their cognitive abilities. This discourse was verified by recent research on conception of design and the expression using digital technologies (McCullough, 1996; Perez-Gomez and Pelletier, 1997). While other design tools did not change as much as representation (Panofsky, 1991; Koch, 1997), the involvement of computers in conventional architecture design arouses a new design thinking of digital architecture (Liu, 1996; Krawczyk, 1997; Murray, 1997; Wertheim, 1999). The notion of the link between ideas and media is emphasized throughout various fields, such as architectural education (Radford, 2000), Internet, and restoration of historical architecture (Potier et al., 2000). Information technology is also an important tool for civil engineering projects (Choi and Ibbs, 1989). Compared with conventional design media, computers avoid some errors in the process (Zaera, 1997). However, most of the application of computers to construction is restricted to simulations in building process (Halpin, 1990). It is worth studying how to employ computer technology meaningfully to bring significant changes to concept stage during the process of building construction (Madazo, 2000; Dave, 2000) and communication (Haymaker, 2000).In architectural design, concept design was achieved through drawings and models (Mitchell, 1997), while the working drawings and even shop drawings were brewed and communicated through drawings only. However, the most effective method of shaping building elements is to build models by computer (Madrazo, 1999). With the trend of 3D visualization (Johnson and Clayton, 1998) and the difference of designing between the physical environment and virtual environment (Maher et al. 2000), we intend to study the possibilities of using digital models, in addition to drawings, as a critical media in the conceptual stage of building construction process in the near future (just as the critical role that physical models played in early design process in the Renaissance). This research is combined with two practical building projects, following the progress of construction by using digital models and animations to simulate the structural layouts of the projects. We also tried to solve the complicated and even conflicting problems in the detail and piping design process through an easily accessible and precise interface. An attempt was made to delineate the hierarchy of the elements in a single structural and constructional system, and the corresponding relations among the systems. Since building construction is often complicated and even conflicting, precision needed to complete the projects can not be based merely on 2D drawings with some imagination. The purpose of this paper is to describe all the related elements according to precision and correctness, to discuss every possibility of different thinking in design of electric-mechanical engineering, to receive feedback from the construction projects in the real world, and to compare the digital models with conventional drawings.Through the application of this research, the subtle relations between the conventional drawings and digital models can be used in the area of building construction. Moreover, a theoretical model and standard process is proposed by using conventional drawings, digital models and physical buildings. By introducing the intervention of digital media in design process of working drawings and shop drawings, there is an opportune chance to use the digital media as a prominent design tool. This study extends the use of digital model and animation from design process to construction process. However, the entire construction process involves various details and exceptions, which are not discussed in this paper. These limitations should be explored in future studies.
series	AVOCAAD
email
last changed	2005/09/09 10:48

_id	e7b8
authors	Dahl, Veronica
year	1983
title	Logic Programming as a Representation of Knowledge
source	IEEE Computer. IEEE Computer Society, October, 1983. vol. 16: pp. 106-110 : ill. includes bibliography
summary	Logic has traditionally provided a firm conceptual framework for representing knowledge. As it can formally deal with the notion of logical consequence, the introduction of Prolog has made it possible to represent knowledge in terms of logic and also to expect appropriate inferences to be drawn from it automatically. This article illustrates and explores these ideas with respect to two central representational issues: problem solving knowledge and database knowledge. The technical aspects of both subjects have been covered elsewhere (Kowalski, R. Logic for problem solving, North- Holland pub. 1979 ; Dahl, V. on database system development through logic ACM Trans.vol.7/no.3/Mar.1982 pp.102). This explanation uses simple, nontechnical terms
keywords	PROLOG, knowledge, representation, logic, programming, problem solving, database
series	CADline
last changed	1999/02/12 15:08

_id	4d66
authors	Kalay, Yehuda E.
year	1983
title	A Relational Database for Non-Manipulative Representation of Solid Objects
source	Computer Aided Design September, 1983. vol. 15: pp. 271-276 : ill. includes bibliography.
summary	Being the heart of any solid modeling system, much effort has been spent on formulating the data models which represent the shape of a polyhedral solid object within the computer in an accurate, unique and complete manner. This paper presents an example relational model as a complementary logical schema for viewing the shape database. It facilitates compact storage and supports non-manipulative query operations through the projection, selection and join operators defined for the relational model, without requiring expert knowledge of the manipulative structure. The flexibility of the relational model, compared with that of the hierarchical, manipulative one, allows easy extensibility and the association of non- geometric attributes with each data item
keywords	solid modeling, polyhedra, relational database, representation
series	CADline
email
last changed	2003/06/02 13:58

_id	a7a8
authors	Preiss, K.
year	1983
title	Future CAD Systems
source	Computer Aided Design July, 1983. vol. 15: pp. 223-227. includes bibliography.
summary	This paper discusses conceptual changes observed as CAD/CAM systems progress from one generation to anther. The influence of representation technology on concepts and methods in CAD/ CAM is discussed, and then the influences of communication between computers are considered. Taken together, these various aspects of computer technology throw light on possible scenarios for the future working environment
keywords	design process, communication, systems, CAD, CAM
series	CADline
last changed	2003/06/02 10:24

_id	46b2
authors	Rasdorf, William J. and Fenves, Stephen J.
year	1983
title	Organization of a Structural Design Database
source	Electronic Computation Conference Proceedings (8th : 1983 : Houston, TX). American Society of Civil Engineers, pp. 559-571. CADLINE has abstract only
summary	This paper proposes a database schema that supports structural engineering design of buildings. An evaluation and comparison of hierarchical, network, and relational databases shows that relational databases are especially suited to a structural engineering design database. The proposed database schema represents the complex relationships between the components of a building-design database. The schema consists of a structural system hierarchy that relates abstract database components to basic building elements. In addition, it combines topology with attributes to achieve an integration that allows the representation of a broad range of common building configurations and structural systems. The user can combine a basic set of constructs to generate either a general or a very detailed description of a structure. The high degree of integration of topology and attributes yields a database that possesses desirable relational characteristics. The database provides efficient access to components based both on their location and on their attribute values. It also allows the user to add, delete, retrieve, and modify database components and values. The versatility and flexibility of the relational model make it a useful tool for managing building engineering data
keywords	building, details, database, civil engineering, integration
series	CADline
last changed	2003/06/02 13:58

_id	acadia03_014
id	acadia03_014
authors	Woo, J.-H., Clayton, M., Johnson, R. and Flores, B.
year	2003
title	Case Study of Tacit Knowledge Sharing in a Distributed Design Studio
source	Connecting >> Crossroads of Digital Discourse [Proceedings of the 2003 Annual Conference of the Association for Computer Aided Design In Architecture / ISBN 1-880250-12-8] Indianapolis (Indiana) 24-27 October 2003, pp. 107-116
doi	https://doi.org/10.52842/conf.acadia.2003.107
summary	This paper demonstrates the effects of experts’ tacit knowledge on improving architectural students’ design artifacts in a distributed design studio. In geographically distributed design environments, the Internet is an important medium by which architects can share tacit knowledge in the form of dialogue via online communication technologies, such as online chat and Instant Messaging (IM). In spring 2003, the National Aeronautics and Space Administration (NASA) and 8 schools conducted a collaborative design studio to develop a crew restraint system for space flights. Online chat software was used as a primary communication channel. Throughout the entire design studio, NASA professionals served as knowledge holders while undergraduate students participated as knowledge seekers. An interpretive content analysis and case study methodology were used in this study. We qualitatively observed the interactions between NASA and the students based upon two aspects: knowledge reflection and design improvement. Data were collected using document analysis of all knowledge sources and students’ design artifacts. The findings of this study indicate that the online chat system is useful in sharing tacit knowledge for the early part of design processes in a distributed design environment. Experts’ tacit knowledge appears to not only influence how students understand problems, but how they initiate conceptual design. This study provides empirical evidence regarding tacit knowledge sharing, and strengthens Schon’s (1983) claim about knowledge reflection in design studio. Furthermore, this study introduces architectural practitioners to the practical necessity of tacit knowledge sharing. This study is significant because its findings indicate the appropriate knowledge management strategy for architectural practitioners.
series	ACADIA
email
last changed	2022/06/07 07:57

_id	ecaade2009_123
id	ecaade2009_123
authors	Achten, Henri; Beetz, Jakob
year	2009
title	What Happened to Collaborative Design?
source	Computation: The New Realm of Architectural Design [27th eCAADe Conference Proceedings / ISBN 978-0-9541183-8-9] Istanbul (Turkey) 16-19 September 2009, pp. 357-366
doi	https://doi.org/10.52842/conf.ecaade.2009.357
wos	WOS:000334282200043
summary	In this paper we present the results of a comprehensive literature survey on the development of collaborative design. We reviewed 324 papers on collaborative design, taken from various sources (conferences, journals, and PhD-theses). We grouped the papers based on common themes, and in that way derived a classification of themes through the last 25 years (1983-2008). Each category is described, its development, and key publications are identified.
keywords	Collaborative design
series	eCAADe
email
last changed	2022/06/07 07:54

_id	21d8
authors	Balas, Egon and Toth, Paolo
year	1983
title	Branch and Bound Methods for the Traveling Salesman Problem
source	December, 1983, 65 p. : ill., tables. Includes bibliography
summary	This paper reviews the state of the art in enumerative solution methods for the traveling salesman problem (TSP). The introduction (Section 1) discusses the main ingredients of branch and bound methods for the TSP. Sections 2,3 and 4 discuss classes of methods based on three different relaxation of the TSP: the assignment problem with the TSP cost function, the 1-tree problem with a Lagrangean objective function, and the assignment problem with a lagrangean objective function. Section 5 briefly reviews some other relaxations of the TSP, while section 6 discusses the performance of some state of the art computer codes. Besides material from the literature, the paper also includes the results and statistical analysis of some computational experiments designed for the purposes of this review
keywords	relaxation, branch-and-bound, algorithms, applications
series	CADline
last changed	2003/06/02 13:58

_id	0000
authors	Bijl, Aart
year	1983
title	Know Your Technology - Or: Can Computers Understand Designers?
source	Proceedings of the International Conference eCAADe [European Computer Aided Architectural Design Education] Brussels (Belgium) 1983, pp. V.1-V.11
doi	https://doi.org/10.52842/conf.ecaade.1983.x.t5s
summary	Any great expansion of the population of computer users, embracing architects and other ordinary people, will happen only if we change from current computing technology to radically new software technology. Criteria for new technology are discussed, with reference to inadequacies of current technology; we should strive for computers that can understand people. Logic programming is described as one development towards this goal, illustrated by the example of Prolog serving as interpreter of user demands and supporting partial and changing logical models of user activity. Architects can choose computing options now that will put them on a path leading to future new technology. Choice is explained, favouring a software environment that is used by researchers and also supports immediate and practical computer applications. Lessons are drawn for architectural education, to prepare for change that will take place during a student's 40-year working life.
keywords	Software Technology, Logic Programming
series	eCAADe
last changed	2022/06/07 07:50

_id	8e02
authors	Brown, A.G.P. and Coenen, F.P.
year	2000
title	Spatial reasoning: improving computational efficiency
source	Automation in Construction 9 (4) (2000) pp. 361-367
summary	When spatial data is analysed the result is often very computer intensive: even by the standards of contemporary technologies, the machine power needed is great and the processing times significant. This is particularly so in 3-D and 4-D scenarios. What we describe here is a technique, which tackles this and associated problems. The technique is founded in the idea of quad-tesseral addressing; a technique, which was originally applied to the analysis of atomic structures. It is based on ideas concerning Hierarchical clustering developed in the 1960s and 1970s to improve data access time [G.M. Morton, A computer oriented geodetic database and a new technique on file sequencing, IBM Canada, 1996.], and on atomic isohedral (same shape) tiling strategies developed in the 1970s and 1980s concerned with group theory [B. Grunbaum, G.C. Shephard, Tilings and Patterns, Freeman, New York, 1987.]. The technique was first suggested as a suitable representation for GIS in the early 1980s when the two strands were brought together and a tesseral arithmetic applied [F.C. Holdroyd, The Geometry of Tiling Hierarchies, Ars Combanitoria 16B (1983) 211–244.; S.B.M. Bell, B.M. Diaz, F.C. Holroyd, M.J.J. Jackson, Spatially referenced methods of processing raster and vector data, Image and Vision Computing 1 (4) (1983) 211–220.; Diaz, S.B.M. Bell, Spatial Data Processing Using Tesseral Methods, Natural Environment Research Council, Swindon, 1986.]. Here, we describe how that technique can equally be applied to the analysis of environmental interaction with built forms. The way in which the technique deals with the problems described is first to linearise the three-dimensional (3-D) space being investigated. Then, the reasoning applied to that space is applied within the same environment as the definition of the problem data. We show, with an illustrative example, how the technique can be applied. The problem then remains of how to visualise the results of the analysis so undertaken. We show how this has been accomplished so that the 3-D space and the results are represented in a way which facilitates rapid interpretation of the analysis, which has been carried out.
series	journal paper
more	http://www.elsevier.com/locate/autcon
last changed	2003/05/15 21:22

_id	88b6
authors	Campello, Ruy Eduardo and Maculan, Nelson
year	1983
title	A Lower Bound to the Set Partitioning Problem with Side Constraints
source	24 p. : ill. Pittsburgh: Design Research Center, CMU, December, 1983 DRC-70-20-83. includes bibliography.
summary	A Lagrangean relaxation approach is proposed to provide a lower bound on the optimal solution of the set partitioning problem with side constraints, which is a general methodology to solve a combinatorial optimization problem. This Lagrangean relaxation approach is accomplished by a subgradient optimization procedure which solves at each iteration a special 0-1 knapsack problem. The approach seems to be promising since it produces feasible integer solutions to the side constraints that can hopefully be the optimal solution to most of the instances of the set partitioning problem with side constraints
keywords	mathematics, operations research, relaxation, algorithms, combinatorics, optimization, constraints
series	CADline
last changed	2003/06/02 13:58

_id	2328
authors	David, B. and Décoppet, A.
year	1983
title	Architectural Programming with CAD
source	Proceedings of the International Conference eCAADe [European Computer Aided Architectural Design Education] Brussels (Belgium) 1983, pp. II.23-II.35
doi	https://doi.org/10.52842/conf.ecaade.1983.x.e3n
summary	We would like to explain to you the programme for a ten-week workshop spending ten hours per week on the architectural programming of a particular project. We have developed a special methodology which is a synthesis between Architectural Programming Methodology and Integrated CAD Methodology and have used it on two occasions. We would like to describe our experience with this workshop.
series	eCAADe
email
more	http://www.grenoble.archi.fr
last changed	2022/06/07 07:50

_id	0d6d
authors	Doyle, Jon
year	1983
title	Admissible State Semantics for Representational Systems
source	IEEE Computer. IEEE computer society, October, 1983. vol. 16: pp. 119-122. includes bibliography
summary	A clear semantic is one of the most important requirements in designing representational systems. This article indicates how many kinds of informal semantics can be transformed directly into formal semantics of no greater complexity. The author focuses on the meaning rather than on the expression within a particular logical language. The distinction of the meaning of mental components from general ecological meaning is done by the name admissible state semantics, leaving the specification of external meaning to the standard tools of model theory. The method of admissible state semantic is simple, resembling the usual explanations of intended meanings given by system designers. The designer explains the meaning of one representation in terms of its relations to other representation in the system. Examples are given
keywords	logic, languages, representation, systems, semantics
series	CADline
last changed	1999/02/12 15:08

_id	ab23
authors	Dromey, Geoff R.
year	1983
title	Before Programming : On Teaching Introductory Computing
source	1983? 10 p. includes bibliography
summary	In comparison with most other human intellectual activities, computing is in its infancy despite the progress we seem to have made in such a short time. Consequently, there has been insufficient time for the evolution of 'best ways' to transmit computing concepts and skills. It is therefore prudent to look to more mature disciplines for some guidelines on effective ways to introduce computing to beginners. In this respect the discipline of teaching people to read and write in a natural language is highly relevant. A fundamental characteristic of this latter discipline is that a substantial amount of time is devoted to teaching people to read long before they are asked to write stories, essays, etc. In teaching computing people seem to have overlooked or neglected what corresponds to the reading stage in the process of learning to read and write. In the discussion which follows the author looks at ways of economically giving students the 'computer-reading experience' and preparing them for the more difficult tasks of algorithm design and computer problem-solving
keywords	programming, education,
series	CADline
last changed	2003/06/02 13:58

_id	0faa
authors	Duelund Mortensen, Peder
year	1991
title	THE FULL-SCALE MODEL WORKSHOP
source	Proceedings of the 3rd European Full-Scale Modelling Conference / ISBN 91-7740044-5 / Lund (Sweden) 13-16 September 1990, pp. 10-11
summary	The workshop is an institution, available for use by the public and established at the Laboratory of Housing in the Art Academy's school of Architecture for a 3 year trial period beginning April 1985. This resumé contains brief descriptions of a variety of representative model projects and an overview of all projects carried out so far, including the pilot projects from 1983 and planned projects to and including January 1987. The Full Scale Model Workshop builds full size models of buildings, rooms and parts of buildings. The purpose of the Full Scale Model Workshop is to promote communication among building's users. The workshop is a tool in an attempt to build bridges between theory and practice in research, experimentation and communication of research results. New ideas and experiments of various sorts can be tried out cheaply, quickly and efficiently through the building of full scale models. Changes can be done on the spot as a planned part of the project and on the basis of ideas and experiments achieved through the model work itself. Buildings and their space can thus be communicated directly to all involved persons, regardless of technical background or training in evaluation of building projects.
keywords	Full-scale Modeling, Model Simulation, Real Environments
series	other
type	normal paper
more	http://info.tuwien.ac.at/efa
last changed	2004/05/04 15:23

_id	0127
authors	Durand, Yves
year	1983
title	Perspective Drawings of Architectural Scenes Calculated by Fortranprograms which Make Use of Hidden Line Algorithms and "Solid Modeling" in APL for the Data Preparation.
source	Proceedings of the International Conference eCAADe [European Computer Aided Architectural Design Education] Brussels (Belgium) 1983, pp. III.36-III.69
doi	https://doi.org/10.52842/conf.ecaade.1983.x.x5q
summary	This paper gives an account of works recently undertaken by the Department of Architecture of Mons Polytechnic School (Belgium) about a program of computer-assisted design. That program, written in FORTRAN, has been elaborated with the object of drawing perspective architectural scenes on digital plotters or graphic printers and of eliminating hidden lines from these scenes. Two algorithms, that yield good results for automatic search of observer's position in terms of orientation and for the computation of hidden lines in case of numerous segments and opaque surfaces, are presented. Some graphic examples are provided. An algorithm of previous classifying of segments and opaque surfaces is propounded. The precision of calculations and the magnitude of tolerances for parametric operations of comparison are discussed. The use of APL to introduce, modify or correct data is approached; in this way, a survey of potential application of APL for solid modeling is suggested.
keywords	Computer-assisted Design, FORTRAN
series	eCAADe
more	http://www.fpms.ac.be
last changed	2022/06/07 07:50

_id	8e9b
authors	Foque, R. and Hashimshony, R.
year	1983
title	Experience of a Design Exercise, Making Use of the Programs: Goal, Bible & Gloss (Developed by Abacus)
source	Proceedings of the International Conference eCAADe [European Computer Aided Architectural Design Education] Brussels (Belgium) 1983, pp. II.1-II.9
doi	https://doi.org/10.52842/conf.ecaade.1983.x.m4v
summary	A 6 weeks (2 days a week) design exercise, making use of the above programs, was held the last bimester in the Faculty of Architecture in TH Delft. This exercise was an experimental one for the students, as well as for the teachers. As the exercise had an experimental character, it is clear that a lot should be learned from that experience, both from its positive and negative outcomes. The paper will try to evaluate on this point for the benefit of those intending to set up similar projects.
keywords	Experimental Exercise
series	eCAADe
last changed	2022/06/07 07:50

_id	4dc9
authors	Fregier, Marius
year	1983
title	TRANSFORMATION PIPES: A model to manipulate data, using graphical interaction, based on transformation pipes, between the graphical devices and a data base
source	Proceedings of the International Conference eCAADe [European Computer Aided Architectural Design Education] Brussels (Belgium) 1983, pp. IV.16-IV.25
doi	https://doi.org/10.52842/conf.ecaade.1983.x.h7h
summary	Conditions of the manipulation of data, using a high level of graphical interaction within a data base in computer aided architectural design, are examined. A so called "TRANSFORMATION PIPES" model (data structure and processes) is described, its goal being to carry out the communications from the graphical devices to the data base and vice versa.
keywords	Abstract Data Structure, Morphological Description
series	eCAADe
last changed	2022/06/07 07:50

_id	620a
authors	Galle, Per
year	1983
title	A Theorem Relating to Exhaustive Generation of Floor Plans
source	Bulletin of Computer Aided Architectural Design. May, 1983. pp. 30-33 : ill
summary	Many problems arise in connection with automated design of architectural floor plans. If modular grids are used, one problem is to avoid repeated generation of the same plan on different modular grids. Using the concept of 'modular complexity,' the paper presents and proves a theorem which offers a solution to this problem
keywords	automation, design, planning, architecture, floor plans, grids, search, synthesis
series	CADline
last changed	1999/02/12 15:08

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