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	ecaade2007_166
id	ecaade2007_166
authors	Liapi, Katherine A.
year	2007
title	An Integrative Design and Spatial Visualization System for Cable Strut Self-tensioned Structures
doi	https://doi.org/10.52842/conf.ecaade.2007.027
source	Predicting the Future [25th eCAADe Conference Proceedings / ISBN 978-0-9541183-6-5] Frankfurt am Main (Germany) 26-29 September 2007, pp. 27-34
summary	Novel conceptions of structures consisting of spatial formations of struts and cables present a uniquely defined morphology and structural performance, and offer opportunities for innovative applications in building design. A common feature of these structures is that their spatial geometry is not “a priori” given. This paper is focused on a specific type of cable-strut structure that occurs from the assembly of self tensioned cable-strut modules The spatial configuration of these structures is very complex and necessitated the development of elaborate geometric algorithms that permit the generation of their formal geometry in a virtual 3D environment. To facilitate both the design and the construction of such structures, a spatial visualization system, which integrates a) algorithms for initial form generation, b) geometric parameters that simulate construction stiffening processes, and c) appropriate structural analysis methods, has been developed. The structural organization and parts of this system are presented in this paper. The system renders feasible the exploration of alternate geometries with various levels of pre-stress and displays initial and final configuration of the structure. It also allows for structural analysis data visualization. Examples of projects designed with the assistance of this system are included and discussed.
keywords	Cable-strut structures, tensegrity structures, modeling
series	eCAADe
email
last changed	2022/06/07 07:59

_id	ecaade2018_414
id	ecaade2018_414
authors	Liapi, Katherine and Papantoniou, Andreana
year	2018
title	Square Tessellation Patterns on Double Layer Minimal Surface Structures - Geometric Investigation and Design Algorithms
doi	https://doi.org/10.52842/conf.ecaade.2018.2.385
source	Kepczynska-Walczak, A, Bialkowski, S (eds.), Computing for a better tomorrow - Proceedings of the 36th eCAADe Conference - Volume 2, Lodz University of Technology, Lodz, Poland, 19-21 September 2018, pp. 385-390
summary	Minimal surfaces, defined as surfaces of the smallest area spanned by a given boundary present advantages for architectural applications in terms of their structural and material performance. Therefore, the investigation of their properties including their geometric ones deserve special attention. In this regard, methods for tessellating minimal surfaces need to be studied. In this paper, patterns that consist of four squares with partly overlapping sides have been considered. A constrain in this study was the square tiles maintained their planarity. Three different types of surfaces have been considered, namely the helicoid, catenoid and Enneper's surface. Design algorithms that generate tiling patterns in all three minimal surface types have been developed and are presented in the paper. The geometric investigation of the application of the developed methods to double layer structures has also been examined and discussed in the paper. Finally, the accuracy of the developed algorithms has been tested through the construction of a physical model.
keywords	minimal surfaces; double layer; square tessellation
series	eCAADe
email
last changed	2022/06/07 07:59

_id	ecaade2017_248
id	ecaade2017_248
authors	Liapi, Katherine, Papantoniou, Andreana and Nousias, Chrysostomos
year	2017
title	Square tessellation patterns on curved surfaces:In search of a parametric design method
doi	https://doi.org/10.52842/conf.ecaade.2017.2.371
source	Fioravanti, A, Cursi, S, Elahmar, S, Gargaro, S, Loffreda, G, Novembri, G, Trento, A (eds.), ShoCK! - Sharing Computational Knowledge! - Proceedings of the 35th eCAADe Conference - Volume 2, Sapienza University of Rome, Rome, Italy, 20-22 September 2017, pp. 371-378
summary	Methods for Tessellating a flat surface with regular or semi-regular patterns of polygons have already been addressed in literature and can be easily parameterized. For the tessellation of curved surfaces using patterns of one or more regular polygons there is not a uniquely defined approach to the problem within the context of architectural research and applications. This paper is focused on the tessellation of curved surfaces with square tiles, where the tessellation pattern consists of four squares with partly overlapping sides. In this study double curvature surfaces were considered first, and subsequently surfaces of more complex geometry such as minimal surfaces. Specifically, a method for the square tessellation of two types of doubly curved surfaces, the spherical and the ellipsoidal, is discussed and presented in the paper. In addition, the square tessellation of two types of minimal surfaces, the catenoid and the helicoid, have also been examined and presented. For each one of the surfaces that have been considered, an algorithm that generates the distribution of the planar square surfaces on the surface and renders possible the parametric description of the problem, was developed and presented in the paper. A discussion on boundary conditions for each developed method is also included. The Grasshopper visual programming language has been used for the parametric description and display of the results in a graphic environment. The research discussed in this paper can find application in several real world problems including surface paneling, or space packing of polyhedral structural units on a curved surface.
keywords	square tessellation, curved surface tiling, ellipsoid tessellation, minimal surfaces tessellation, geometric appxoximation methods
series	eCAADe
email
last changed	2022/06/07 07:59

_id	sigradi2015_6.341
id	sigradi2015_6.341
authors	Licht, Marcele Cassol; Gonçalves, Berenice Santos
year	2015
title	Interactivity and motivation in digital book
source	SIGRADI 2015 [Proceedings of the 19th Conference of the Iberoamerican Society of Digital Graphics - vol. 1 - ISBN: 978-85-8039-135-0] Florianópolis, SC, Brasil 23-27 November 2015, pp. 248-255.
summary	The development of digital devices such as tablets allowed different ways to present content by the use of multimedia and interactive resources. In this sense, the existing interactivity in digital book has features that make it different from the printed book. So the reader will have specific interests on using a digital book. Therefore, this article performs a descriptive analysis on WWF Together interactive digital book, which starts from two axes: considers the interface interactivity and the reader’s motivation. After this analysis it was possible to understand the relationship between interactivity and digital book content representation, aiming to encourage the reader’s motivation.
keywords	Design, Digital Book, Interactivity, Motivation
series	SIGRADI
email
last changed	2016/03/10 09:54

_id	02f7
authors	Liebich, Thomas and Kim, Inhan
year	1995
title	ID'EST: An Integrated Modelling Framework for Management of Architectural Data
source	Sixth International Conference on Computer-Aided Architectural Design Futures [ISBN 9971-62-423-0] Singapore, 24-26 September 1995, pp. 377-387
summary	An Integrated Design Environment, IDE, facilitates cooperation between different disciplines. The paper investigates the data modelling framework, distinguishes between homogeneous and heterogeneous model worlds, discusses the formal mapping mechanisms available to establish a heterogeneous model world, and introduces a way to incorporate CAD systems into IDE A prototype IDE has been developed to prove these methods. The ID'EST prototype comprises its own core data model, different schemas to cope with several design views, and interfaces to incorporate external CAD systems. A prototype architectural data model has been defined, that includes core data models and aspect models for enclosure system and spatial system. Conventional CAD systems can be integrated into ID'EST, if they are able to map data from the aspect models into their own data structure, and vice versa, on a high semantic level. The inherent methods of classifying data in CAD, layers, macros and attached attributes, have been used to retrieve product data from CAD data files. The usability of conventional CAD systems as data instantiation tools for IDE has been proved and a path has been shown, by which existing tools can be integrated into new technology solutions.
keywords	Product Modelling, Formal Mapping Specification, Computer-Aided Design
series	CAAD Futures
email
last changed	2003/05/16 20:58

_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	cc1a
authors	Lien, Kristian, Go Suzuki and Westerberg, Arthur W.
year	1986
title	The Role of Expert Systems Technology In Design
source	[2] 49 p. : diagrams Engineering Design Research Center, CMU, September, 1986 EDRC-06-13-86. includes bibliography.
summary	Using a scenario format, this paper first reviews the nature of chemical process design, showing that designers quickly make major decisions with minimal information and constantly revise their strategy to solve a problem. To automate this activity on a computer will require models of the process being created at several levels of abstraction as well as models that capture the beliefs of the modeler about the abilities of himself, others and the aids available and models of strategies for complex problem solving. The second section of the paper extensively reviews current expert system concepts, illustrating each of them with design examples. It is argued that expert systems are knowledge based. The authors describe many of the control strategies used in today's systems, and also consider different problem representations - rules, logic and frames - and indicate when each might be preferred. The last section presents the authors views on what will be involved in creating a future expert system for design
keywords	engineering, abstraction, expert systems, CAD, design process, representation, knowledge base, frames, control
series	CADline
last changed	2003/06/02 10:24

_id	be8b
authors	Liew, Pak-San and Gero, John S.
year	2002
title	An Implementation Model of Constructive Memory for a Design Agent
source	Gero JS and Brazier FMT (eds) (2002) Agents in Design 2002. Key Centre of Design Computing and Cognition, University of Sydney, pp. 257-276
summary	This paper describes a computational model that implements the operations of a constructive memory system for design. The current model is based on a modified Interactive Activation and Competition (IAC) network with learning capabilities incorporated. Implementations and experiments pertaining to the various features of the constructive memory system are also described.
series	other
email
last changed	2003/05/10 10:16

_id	55e0
authors	Liggett, R, Friedman, S, and Jepson, W.
year	1995
title	Interactive Design/Decision Making in a Virtual Urban World: Visual Simulation and GIS
source	Proceedings of the Fifteenth Annual ESRI User Conference. Palm Springs, CA, (May)
summary	Researchers at UCLA have developed an Urban Simulator which links virtual reality technology with traditional two-dimensional Geographic Information Systems (GIS) and databases. This paper discusses the data structure and interface requirements necessary to integrate a real-time three-dimensional visual simulation system with a GIS system. Potential uses of the integrated system are illustrated with a set of current projects in the Los Angeles area.
series	other
email
last changed	2003/04/23 15:50

_id	dc71
authors	Liggett, R., Friedmann, S. and Jepson, W.
year	1995
title	Interactive Design/Decision Making in a Virtual Urban World: Visual Simulation and GIS
source	Proceedings of the Fifteenth 1995 ESRI User Conference, Palm Springs, CA, May, 1995
summary	Researchers at UCLA have developed an Urban Simulator which links virtual reality technology with traditional two-dimensional Geographic Information Systems (GIS) and databases. This paper discusses the data structure and interface requirements necessary to integrate a real-time three-dimensional visual simulation system with a GIS system. Potential uses of the integrated system are illustrated with a set of current projects in the Los Angeles area.
keywords	3D City Modeling, Development Control, Design Control
series	other
more	http://www.aud.ucla.edu/%7Erobin/esripaper/p308.html
last changed	2003/02/24 10:56

_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	a88f
authors	Liggett, Robin , Jepson, William and Teodosiadis, Stephen
year	1991
title	A Stratified Approach to the Integration of Low Cost Modelling with Advanced Technology Rendering
source	Computer Aided Architectural Design Futures: Education, Research, Applications [CAAD Futures ‘91 Conference Proceedings / ISBN 3-528-08821-4] Zürich (Switzerland), July 1991, pp. 105-120
summary	This paper presents a stratified approach to the integration of low cost modeling software (such as AutoCAD) with advanced workstation based rendering systems (such as Wavefront and the Silicon Graphics radiosity renderer). Powerful extensions to the basic modeling system are introduced which greatly reduce the required design effort, while significantly increasing the efficiency of the rendering software.
series	CAAD Futures
last changed	1999/04/07 12:03

_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	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	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

_id	ecaade2010_113
id	ecaade2010_113
authors	Lim, Chor-Kheng
year	2010
title	A Preliminary Study for a Teaching Framework that Incorporates CAD/CAM Media into the Basic Design Studio
doi	https://doi.org/10.52842/conf.ecaade.2010.041
source	FUTURE CITIES [28th eCAADe Conference Proceedings / ISBN 978-0-9541183-9-6] ETH Zurich (Switzerland) 15-18 September 2010, pp.41-50
summary	The objective of this research is to apply the teaching of CAD/ CAM media to basic design studios for 1~2 year undergraduate students. The research consequently concludes a framework of “e-basic design studio” based on literature analysis and design studio observations, which including the new tectonics thinking and the operation of traditional 2D/3D design media and CAD/CAM digital tools.
wos	WOS:000340629400003
keywords	Design education; Basic design studio; CAD/CAM design media; Digital thinking
series	eCAADe
email
last changed	2022/06/07 07:52

_id	caadria2024_513
id	caadria2024_513
authors	Lim, Chor-Kheng
year	2024
title	From Pencil to Pixel: The Evolution of Design Ideation Tools
doi	https://doi.org/10.52842/conf.caadria.2024.3.089
source	Nicole Gardner, Christiane M. Herr, Likai Wang, Hirano Toshiki, Sumbul Ahmad Khan (eds.), ACCELERATED DESIGN - Proceedings of the 29th CAADRIA Conference, Singapore, 20-26 April 2024, Volume 3, pp. 89–98
summary	This study explores the integration of Artificial Intelligence-Generated Content (AIGC) in design processes, focusing on the ideation phase. Utilizing in-depth interviews with experienced designers and an experimental approach with novices, it compares AIGC tools like ChatGPT, Midjourney and Copilot with traditional sketching methods. The findings reveal two distinct operational patterns in AIGC utilization: a subtractive method of refining AI outputs and an additive method of evolving design through AI suggestions. Experienced designers view AIGC as a powerful aid for creative ideation, while novices prefer familiar hand-drawing methods. The study proposes a "Seeing-Instructing-Seeing" model, adapting Schön's reflective practice model, to incorporate the collaborative dynamic between designers and AI, marking a shift from manual to intellectual labor in design ideation. This represents a paradigm shift in design methodologies, suggesting a future of co-creative partnerships between designers and AI tools.
keywords	AIGC, Ideation Design Process, Textual Thinking, Creativity
series	CAADRIA
email
last changed	2024/11/17 22:05

_id	caadria2018_268
id	caadria2018_268
authors	Lim, Joie, Janssen, Patrick and Stouffs, Rudi
year	2018
title	Automated Generation of BIM Models from 2D CAD Drawings
doi	https://doi.org/10.52842/conf.caadria.2018.2.061
source	T. Fukuda, W. Huang, P. Janssen, K. Crolla, S. Alhadidi (eds.), Learning, Adapting and Prototyping - Proceedings of the 23rd CAADRIA Conference - Volume 2, Tsinghua University, Beijing, China, 17-19 May 2018, pp. 61-70
summary	Existing buildings are often lacking BIM models. This paper proposes a method to semi-automate the generation of BIM models from 2D CAD drawings. The method has two parts: the first part, 2D CAD drawing preparation, involves cleaning the drawings to obtain simplified 2D input geometry and the second, 3D BIM model generation, involves generating and extracting parameters to generate 3D BIM components. This research focuses on the semi-automation of the second part. The the model is generated storey by storey, with each building element type being processed. A demonstration was carried out for a case-study building. The main modelling strategies used by the method are described and key challenges are discussed.
keywords	BIM; CAD drawings; conversion; generation; Grasshopper
series	CAADRIA
email
last changed	2022/06/07 07:59

_id	ijac20086403
id	ijac20086403
authors	Lim, Sungwoo; Prats, Miquel; Jowers, Iestyn; Chase, Scott; Garner, Steve; McKay, Alison
year	2008
title	Shape Exploration in Design: Formalising and Supporting a Transformational Process
source	International Journal of Architectural Computing vol. 6 - no. 4, 415-433
summary	The process of sketching can support the sort of transformational thinking that is seen as essential for the interpretation and reinterpretation of ideas in innovative design. Such transformational thinking, however, is not yet well supported by computer-aided design systems. In this paper, outcomes of experimental investigations into the mechanics of sketching are described, in particular those employed by practicing architects and industrial designers as they responded to a series of conceptual design tasks. Analyses of the experimental data suggest that the interactions of designers with their sketches can be formalised according to a finite number of generalised shape rules. A set of shape rules, formalising the reinterpretation and transformations of shapes, e.g. through deformation or restructuring, is presented. These rules are suggestive of the manipulations that need to be afforded in computational tools intended to support designers in design exploration. Accordingly, the results of the experimental investigations informed the development of a prototype shape synthesis system, and a discussion is presented in which the future requirements of such systems are explored.
series	journal
last changed	2009/03/03 07:48

_id	sigradi2017_062
id	sigradi2017_062
authors	Lima da Silva, Juliano; Andréa Quadrado Mussi, Lauro André Ribeiro, Thaísa Leal da Silva
year	2017
title	Programação em plataforma BIM e a Norma de Desempenho Brasileira: Desenvolvimento de uma aplicação para estimativa de performance acústica em projetos arquitetônicos [BIM platform programming and Brazilian Performance Standard: Development of an application to estimate acoustic performance in architectural design]
source	SIGraDi 2017 [Proceedings of the 21th Conference of the Iberoamerican Society of Digital Graphics - ISBN: 978-956-227-439-5] Chile, Concepción 22 - 24 November 2017, pp.423-428
summary	The Brazilian Performance Standard (NBR 15.575/2013 – Housing Buildings – Performance) is changing the design process of residential buildings, imposing new acoustic performance criteria. In this Context, the present paper proposes the programming of a Revit plug-in for verifying sound insulation of walls between environments, collecting information of the building’s model from a parameter database, calculating values of the elements’ sound reduction index and allowing to ponder constructive systems’ performance. The application aims to amplify productivity of designers and to provide greater control over technological solutions, assisting in the compliance with performance criteria.
series	SIGRADI
email
last changed	2021/03/28 19:58

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