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	2e74
authors	Liebich, Thomas
year	1994
title	Behind the Lines - Managing Semantically Rich Data in Architecture
doi	https://doi.org/10.52842/conf.ecaade.1994.x.u5d
source	The Virtual Studio [Proceedings of the 12th European Conference on Education in Computer Aided Architectural Design / ISBN 0-9523687-0-6] Glasgow (Scotland) 7-10 September 1994, pp. 253
summary	Current CAD systems have inherent bottlenecks, which diminish possible achievements for architectural practices. Among these shortcomings there are two the paper will deal with. Firstly, traditional CAD relies on a pure geometric model. All non-geometric information about objects of architectural interest has to be attached to these geometric entities. This restricts the ability to describe semantically dependent relationships. Secondly, the integration of different design tools for building and construction is still at its very beginning. The data exchange remains restricted, since it is based on a fairly low semantic level of a document-based exchange of information, such as geometric representation in DXF or IGES, rather than on a high semantic level of a model-based exchange.
series	eCAADe
last changed	2022/06/07 07:50

_id	c937
authors	Liebowitz, D., Criminisi, A. and Zisserman, A.
year	1999
title	Creating architectural models from images
source	EUROGRAPHICS'99
summary	We present methods for creating 3D graphical models of scenes from a limited numbers of images, i.e. one or two, in situations where no scene co-ordinate measurements are available. The methods employ constraints available from geometric relationships that are common in architectural scenes - such as parallelism and orthogonality - together with constraints available from the camera. In particular, by using the circular points of a plane simple, linear algorithms are given for computing plane rectification, plane orientation and camera calibration from a single image. Examples of image based 3D modelling are given for both single images and image pairs.
series	other
last changed	2003/04/23 15:14

_id	855a
authors	Liew, B.K., Mathur, K., Tan, C.L., Tham, H.C., Teh, H.C., Loe, K.F., Heah, K.L.
year	1993
title	PARADISE: An Intelligent CAD System architecture
source	The Int. Journal of Construction IT 1(3), pp.1-24
summary	This paper presents the architecture of an intelligent CAD system called PARADISE. The motivation is in addressing the lack in architectural computing that has to do with intelligent assistance of design at the early stages. A schema for representing and integrating design knowledge and graphical data called the Design Model (DM) is presented. Following which, work done in developing the CAD-based front end of PARADISE called the graphic subsystem (PGS) is described. The emphasis is at providing tools which facilitate the creation and manipulation of form and spaces at early design stages. We then describe the functionalities of our geometric reasoner (PGS) is described. The geometric reasoner is responsible for all reasoning between the syntax of design drawings and its related semantics. We highlight, in particular, the reasoning of implicit spaces.
series	journal paper
last changed	2003/05/15 21:45

_id	b255
authors	Liew, Haldane
year	2002
title	Descriptive Conventions for Shape Grammars
doi	https://doi.org/10.52842/conf.acadia.2002.365
source	Thresholds - Design, Research, Education and Practice, in the Space Between the Physical and the Virtual [Proceedings of the 2002 Annual Conference of the Association for Computer Aided Design In Architecture / ISBN 1-880250-11-X] Pomona (California) 24-27 October 2002, pp. 365-378
summary	This paper introduces a new set of descriptive conventions for shape grammars, and illustrates howthey can be used to address problems with user experience. The shape grammar formalism has beenshown to be capable of generating designs such as Palladian villas, Prairie houses and Queen Annehouses. The formalism can describe the process to develop a design through the use of rules, symbols,and lines.The user’s experience in applying the rules is often neglected in the design of the grammars. Thiscreates four problems: 1) the user is unaware of the implicit sequencing of rules, 2) the user cangenerate invalid design states, 3) the user is forced to apply technical rules that do not change theoverall design, and 4) the user is only given a restricted set of design choices.To address these problems, a new set of descriptive conventions has been developed that provides alayer of abstraction built on top of the formalism. These conventions are currently being implementedusing the Visual LISP programming environment in AutoCAD. The program applies rules, whichincorporate the use of the new conventions, to produce a design.The conventions are based on two techniques. The first technique is an explicit control mechanism thatdetermines the sequencing of rules based on the success or failure of a rule application. Becausesome design changes require more than one rule, this allows the grammar to chain a sequence of rulesto create macros since. The second technique is a mechanism that demarcates an area of the drawingfor query. With this technique, a rule is able to recognize void spaces in a drawing.A comparison of the rules to construct a bi-laterally symmetrical grid in three grammars--Palladian,Yingzao Fashi, and Grid--will be used to demonstrate the advantages of the new conventions.
series	ACADIA
email
last changed	2022/06/07 07:59

_id	ecaade03_639_62_liew
id	ecaade03_639_62_liew
authors	Liew, Haldane
year	2003
title	SGML - A Shape Grammar Meta-Language
doi	https://doi.org/10.52842/conf.ecaade.2003.639
source	Digital Design [21th eCAADe Conference Proceedings / ISBN 0-9541183-1-6] Graz (Austria) 17-20 September 2003, pp. 639-648
summary	The shape grammar meta-language creates layers of abstraction in the shape grammar formalism for the purpose of developing descriptions that can organize and sequence rule applications in a grammar, filter information in a drawing, and provide additional matching constraints based on the subshapes found. These concepts are incorporated into the formalism by expanding the rule application process into six phases; control, context, transformations, parameters, descriptors, and application. Seven meta-language descriptive conventions are developed from the six phases; rule-sets, directive, label-filters, focus, maxline, zones, and apply-mode. Examples of how the meta-language descriptions can be used to generate designs are provided.
keywords	Shape grammars, meta-language, and computational design
series	eCAADe
email
more	http://architecture.mit.edu/~haldane
last changed	2022/06/07 07:59

_id	6cc2
authors	Liew, P.S. and Gero, J.S.
year	2002
title	A Memory System for a Situated Design Agent Based on Constructive Memory
doi	https://doi.org/10.52842/conf.caadria.2002.199
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. 199-206
summary	Situated design agents require new types of memory. The design of a memory system for use in such a design agent, based on the notion of constructive memory is proposed. The specification of the memory system is derived from the architecture of a situated design agent. Cognitive studies of the human memory system provide the functional and behavioural characterization of the memory system.
series	CAADRIA
email
last changed	2022/06/07 07:59

_id	cf2003_m_014
id	cf2003_m_014
authors	LIEW, Pak-San and GERO, John S .
year	2003
title	Operational Characteristics of a Constructive Memory System for Design Agents
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. 137-146
summary	This paper describes the operational characteristics of a constructive memory for a design agent that distinguishes it from a standard retrieval system. An architecture example pertaining to this behaviour of the system is also illustrated through a simulation of the memory system.
keywords	constructive memory, agents, situated
series	CAAD Futures
email
last changed	2003/09/22 12:21

_id	a2e6
authors	Liggett, R.S., Mitchell, W.J. and Tan, M.
year	1992
title	Multi-Level Analysis and Optimization of Design
source	New York: John Wiley & Sons, 1992. pp. 2512-269 : ill. includes bibliography
summary	This paper discusses a knowledge-based computer-aided design system, that provides multi-level analysis capabilities, and that automatically propagates constraints on design variables from level to level. It also Supports formulation and solution of optimization problems at different levels, so that a solution can be approached by solving a sequence of appropriately constrained sub-optimization problems. Theory and implementation are discussed, and a detailed case study of application to the design of small house plans is provided
keywords	constraints, design, methods, knowledge base, CAD, systems, analysis, optimization, automation, user interface, shape grammars
series	CADline
email
last changed	2003/06/02 14:41

_id	eb7b
authors	Liggett, Robin S.
year	1980
title	The Quadratic Assignment problem: an Analysis of Applications and Solution Strategies
source	Environment and Planning B. 1980. vol. 7: pp. 141-162 : tables. includes bibliography
summary	A wide variety of practical problem in design, planning and management can be formulated as quadratic assignment problems, and this paper discusses this class of problem. Since algorithms for producing optimal solutions to such problems are computationally infeasible for all but small problems of this type, heuristic techniques must usually be employed for the solution of real practical problems. This paper explores and compares a variety of solution techniques found in the literature considering the trade-offs between computational efficiency and quality of solutions generated. Recommendations are made about the key factors to be considered in developing and applying heuristic solution procedures
keywords	design process, algorithms, graphs, quadratic assignment, operations research, optimization, automation, synthesis, heuristics, space allocation, floor plans, management, planning
series	CADline
email
last changed	2003/06/02 13:58

_id	8488
authors	Liggett, Robin S.
year	1992
title	A Designer-Automated Algorithm Partnership : An Interactive Graphic Approach to Facility Layout
source	New York: John Wiley & Sons, 1992. pp. 101-123 : ill. includes bibliography
summary	Automated solution technique for spatial allocation problems have long been an interest of researchers in computer-aided design. This paper describes research focusing on the use of an interactive graphic interface for the solution of facility layout problems which have quantifyable but sometimes competing criteria. The ideas presented in the paper have been implemented in a personal computer system
keywords	algorithms, user interface, layout, synthesis, floor plans, architecture, facilities planning, automation, space allocation, optimization
series	CADline
email
last changed	2003/06/02 13:58

_id	b76e
authors	Liggett, Robin S.
year	2000
title	Automated facilities layout: past, present and future
source	Automation in Construction 9 (2) (2000) pp. 197-215
summary	This paper reviews the history of automated facility layout, focusing particularly on a set of techniques which optimize a single objective function. Applications of algorithms to a variety of space allocation problems are presented and evaluated. Guidelines for future implementations of commercial systems are suggested.
series	journal paper
more	http://www.elsevier.com/locate/autcon
last changed	2003/05/15 21:22

_id	sigradi2015_11.165
id	sigradi2015_11.165
authors	Ligler, Heather; Economou, Thanos
year	2015
title	Lost in Translation: Towards an Automated Description of John Portman’s Domestic Architecture
source	SIGRADI 2015 [Proceedings of the 19th Conference of the Iberoamerican Society of Digital Graphics - vol. 2 - ISBN: 978-85-8039-133-6] Florianópolis, SC, Brasil 23-27 November 2015, pp. 657-661.
summary	The prevalent mode of shape grammar output is a two-dimensional drawing grammar. For architectural applications, these two- dimensional shape rules can hold a variety of interpretations in three-dimensional space. This work translates an existing grammar from a manual two-dimensional drawing grammar to an automated three-dimensional building grammar to explore the challenges and opportunities that this translation suggests in the larger context of shape computation. The case study considered here is a grammar interpreting John Portman’s architectural language as defined by the house Portman identifies as emblematic of his design principles, his 1964 personal residence Entelechy I.
keywords	Shape Grammars, Shape Grammar Implementations, Formal Composition, Generative Systems
series	SIGRADI
email
last changed	2016/03/10 09:54

_id	acadia12_97
id	acadia12_97
authors	Lilley, Brian ; Hudson, Roland ; Plucknett, Kevin ; Macdonald, Rory ; Cheng, Nancy Yen-Wen ; Nielsen, Stig Anton ; Nouska, Olympia ; Grinbergs, Monika ; Andematten, Stephen ; Baumgardner, Kyle ; Blackman, Clayton ; Kennedy, Matthew ; Chatinthu, Monthira ; Tianchen, Dai ; Sheng-Fu, Chen
year	2012
title	Ceramic Perspiration: Multi-Scalar Development of Ceramic Material
doi	https://doi.org/10.52842/conf.acadia.2012.097
source	ACADIA 12: Synthetic Digital Ecologies [Proceedings of the 32nd Annual Conference of the Association for Computer Aided Design in Architecture (ACADIA) ISBN 978-1-62407-267-3] San Francisco 18-21 October, 2012), pp. 97-108
summary	Ceramic building material is a useful passive modulator of the environment. The subject area is based on traditional cultural and material knowledge of clay properties: from amphora to rammed earth building; and ranges to present uses: from desiccants and space shuttle tile patterns to bio-ceramics. The primary consideration is to control material density and porosity in a tile component, in response to specific environmental conditions. This depends on a number of key physical principles: the ability of the material to absorb thermal energy, the ability to absorb and then ‘wick’ moisture within the pore structure, and the decrement factor or ‘time lag’ of the effect. The interplay between these properties point to the importance of directionality in the porous microstructure, at the boundary layer. Material characteristics have been investigated in the laboratory at a micron scale and in the ceramics workshop at full scale, with some interplay between the two. Recent work done on monitoring has led to the development of software tools that allow feedback (approaching real time)- a visual representation of the dynamic thermal and hygrometric properties involved.
keywords	Synthetic tectonics , composite materials , smart assemblies , emerging material processes , Responsive environments , sensing , real-time computation , feedback loops , Information Visualization
series	ACADIA
type	normal paper
email
last changed	2022/06/07 07:59

_id	acadia07_000
id	acadia07_000
authors	Lilley, Brian, Beesley, Philip (eds.)
year	2007
title	Expanding Bodies: Art • Cities• Environment
doi	https://doi.org/10.52842/conf.acadia.2007
source	Proceedings of the 27rd Annual Conference of the Association for Computer Aided Design in Architecture / ISBN 978-0-9780978-6-8] Halifax (Nova Scotia) 1-17 October, 2007.
series	ACADIA
last changed	2022/06/07 07:49

_id	ecaade2021_059
id	ecaade2021_059
authors	Lim, Ariel Cheng Sin and Thomsen, Mette Ramsgaard
year	2021
title	Multi-Material Fabrication for Biodegradable Structures - Enabling the printing of porous mycelium composite structures
doi	https://doi.org/10.52842/conf.ecaade.2021.1.085
source	Stojakovic, V and Tepavcevic, B (eds.), Towards a new, configurable architecture - Proceedings of the 39th eCAADe Conference - Volume 1, University of Novi Sad, Novi Sad, Serbia, 8-10 September 2021, pp. 85-94
summary	Our awareness of the earth's depleting resources has directed focus towards biomaterials, which can be extracted sustainably and biodegraded after use. Current fabrication of biomaterial structures is still restricted in strength and geometry, limiting its use in construction. This paper presents a novel two-phase multi-material fabrication process to create mycelium composite structures of higher porosity and complexity with speculated improvements in strength. First, cellulose pulp inoculated with mycelium is extruded. Then, each layer is filled by a secondary supporting material. This material, in the form of a gravel- and sand-slurry, acts as an inhospitable medium steering mycelial growth, additionally improving aeration to produce stronger structures. After an intermediate growth period, the secondary material, reusable in a closed-loop production model, is removed to reveal the fully-grown mycelium structure. The paper reports on each of the three aspects: the fabrication process, material experimentation of primary and secondary substrates, as well as geometry of varying porosity and performance.
keywords	biomaterials; mycelium; biodegradable structures; robotic fabrication; additive manufacturing
series	eCAADe
email
last changed	2022/06/07 07:59

_id	acadia03_051
id	acadia03_051
authors	Lim, Chor-Kheng
year	2003
title	G Pen: An Intelligent Designer’s Playmate
doi	https://doi.org/10.52842/conf.acadia.2003.403
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. 403-409
summary	In the field of design the pen-based system is a newly developed computer interface that provides the designer with the convenience of a pen in freehand sketches. But these pen-based systems only focus on an interface familiar to the designers and the application of the hardware and software that go with it, treating the pen only as a mouse-like input device. As pen and pad are devices for the pen-based system, the hope is that they can be endowed with more intelligent characteristics to let them interact with designer’s gestures and become a creative source for the designers, while simultaneously preventing the design fixation encountered by designers during design process. This research utilizes the unintentional hand gestures made by designers, such as the designer’s grip of the pen or movement involved in playing with the pen, putting it down, knocking it, twisting it or shaking it, during the thinking process or when running into a design fixation. From the interaction between the pen and the pad, certain actions may be generated to stimulate the designer’s thinking process. This research uses a neural network as the main learning mechanism for the eventual development of a prototype of a pen-based drawing system that provides timely visual stimulation: a G Pen system.
series	ACADIA
email
last changed	2022/06/07 07:52

_id	ecaade03_615_54_kheng
id	ecaade03_615_54_kheng
authors	Lim, Chor-Kheng
year	2003
title	Is a pen-based system just another pen or more than a pen?
doi	https://doi.org/10.52842/conf.ecaade.2003.615
source	Digital Design [21th eCAADe Conference Proceedings / ISBN 0-9541183-1-6] Graz (Austria) 17-20 September 2003, pp. 615-622
summary	Freehand sketch is the most critical stage in the design process. The importance of the freehand sketch is in its ability to freely represent various projections of ambiguous drawing using a convenience tool, pen-and-paper. Recently, pen-based system which developed attempted to use pen as an input device, allowing sketches to be freely drawn on computers. However, as far as the various drawing projections, such as diagram, symbol, plan, elevation, section, perspective, etc., how are they interrelated to a designer’s cognitive behavior? Different media have different abilities to represent projections. What’s the difference of design cognitive behavior between conventional pen-and paper and pen-based system in view of both using a pen as a design medium? This research proceeds a think-aloud protocol analysis to present an analysis and discussion. Research results show that there is a relationship of gradual embodiment, mutually complementary, going from a whole to being dissected into sections between the different projections. Moreover, pen-based system is more than a pen, it allows designer to inspect a 3-D view during the sketching stage. This gives the designer more opportunities during the sketching stage to conduct the design thinking process based on the ambiguous 2-D projections and the more concrete 3-D images, as well as more opportunities for visual feedback
series	eCAADe
email
last changed	2022/06/07 07:59

_id	acadia03_049
id	acadia03_049
authors	Lim, Chor-Kheng
year	2003
title	An Insight into the Freedom of Using a Pen: Pen-based System and Pen-and-paper
doi	https://doi.org/10.52842/conf.acadia.2003.385
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. 385-393
summary	In earlier researches on freehand sketching, the cognitive behavior of designers was studied. In recent years, some researchers began to look into this area from the design media aspect. The pen-based system, developed by Gross, Landay and other researchers, used the pen as an input device, allowing sketches to be freely drawn in a computer environment. The importance of the freehand sketch lies in its ability to freely represent various drawing projections using ambiguous sketches. However, as for the various drawing projections, such as diagrams, symbols, plans, elevations, sections, perspectives, etc., how are they interrelated to a designer’s thinking process and the cognitive behavior? Different media have different abilities to represent different projections. Would they affect the designer’s design thinking as well? Targeting different media, i.e., conventional freehand sketches vs. the computer pen-based system, this research uses case studies and think-aloud protocol analysis to present an analysis and discussion. Research results show that there is a relationship of gradual embodiment that is mutually complementary, going from a whole perspective to being the dissected into sections between the different projections. In addition, these projections restrict the designer’s various design thinking processes, while the use of different media may somewhat change the actual design thinking of the designer
series	ACADIA
email
last changed	2022/06/07 07:52

_id	caadria2009_186
id	caadria2009_186
authors	Lim, Chor-Kheng
year	2009
title	Digital CAD/CAM Media Realizes Chinese Calligraphy Aesthetics in Architectural Design
doi	https://doi.org/10.52842/conf.caadria.2009.225
source	Proceedings of the 14th International Conference on Computer Aided Architectural Design Research in Asia / Yunlin (Taiwan) 22-25 April 2009, pp. 225-234
summary	This paper attempts to explore a design method that incorporates the concept of ancient Chinese Art aesthetics into modern architectural form and space. Through the Case Study, a preliminary framework of freeform design process in using CAD/CAM media is concluded. It reveals the digitalized design process of artistic freeform space and shows Chinese calligraphy aesthetics in contemporary architecture.
keywords	Chinese Art: aesthetics; calligraphy; CAD/CAM media; digital design process
series	CAADRIA
email
last changed	2022/06/07 07:52

_id	sigradi2010_22
id	sigradi2010_22
authors	Lim, Chor-Kheng
year	2010
title	A Teaching Framework of an “E - basic Design Studio”
source	SIGraDi 2010_Proceedings of the 14th Congress of the Iberoamerican Society of Digital Graphics, pp. Bogotá, Colombia, November 17-19, 2010, pp. 22-25
summary	The objective of this research is to illustrate the teaching of CAD/CAM media in basic design studios for 1st and 2nd year undergraduate students. The research consequently establishes a framework for an “e - basic design studio” based on design studio observations and analysis of academic literature, which include the new thoughts on tectonics and the operation of traditional 2D/3D design media and CAD/CAM digital tools.
keywords	design education, basic design studio, CAD/CAM media, digital thinking.
series	SIGRADI
email
last changed	2016/03/10 09:54

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