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 caadria2020_434
id caadria2020_434
authors Lange, Christian, Ratoi, Lidia and Co, Dominic Lim
year 2020
title Reformative Coral Habitats - Rethinking Artificial Reef structures through a robotic 3D clay printing method.
doi https://doi.org/10.52842/conf.caadria.2020.2.463
source D. Holzer, W. Nakapan, A. Globa, I. Koh (eds.), RE: Anthropocene, Design in the Age of Humans - Proceedings of the 25th CAADRIA Conference - Volume 2, Chulalongkorn University, Bangkok, Thailand, 5-6 August 2020, pp. 463-472
summary In 2018 after Typhoon Mangkhut hit Hong Kong, the city lost around 80% of its existing corals. As a consequence, a team consisting of marine biologists and architects have developed a series of performative structures that will be deployed in Hong Kong waters intending to aid new coral growth over the coming years. This paper describes the present research that focuses on the design and fabrication of artificial reef structures utilizing a robotic 3d clay printing method addressing the specificities of Hong Kong marine ecologies. The paper describes further the algorithmic design methodology, the optimization processes in the generation of the printing path, and the methodology for the fabrication processes during the production cycle to achieve even quality and prevent cracking during the drying process.
keywords Digital Fabrication; 3D clay printing; Artificial Coral Reefs; Computational Design
series CAADRIA
email
last changed 2022/06/07 07:52

_id acadia20_164p
id acadia20_164p
authors Lange, Christian; Ratoi, Lidia; Co Lim, Dominic; Hu, Jason; Baker, David M.; Yu, Vriko; Thompson, Phil
year 2020
title Reformative Coral Habitats
source ACADIA 2020: Distributed Proximities / Volume II: Projects [Proceedings of the 40th Annual Conference of the Association of Computer Aided Design in Architecture (ACADIA) ISBN 978-0-578-95253-6]. Online and Global. 24-30 October 2020. edited by M. Yablonina, A. Marcus, S. Doyle, M. del Campo, V. Ago, B. Slocum. 164-169
summary Coral reefs are some of the most diverse ecologies in the marine world. They are the habitat to tens of thousands of different marine species. However, these wildlife environments are endangered across the globe. Recent research estimates that around 75 percent of the remaining coral reefs are currently under threat. In 2018 after a devastating storm, Hong Kong lost around 80% of its existing corals. Consequently, a team consisting of marine biologists and architects at The University of Hong Kong has developed a series of performative structures that have been deployed in the city's waters in July 2020, intending to aid new coral growth over the coming years. The project was commissioned by the Agriculture, Fisheries, and Conservation Department (AFCD) and is part of an ongoing active management measure for coral restoration in Hoi Ha Wan Marine Park in Hong Kong. The following objectives were defined as part of the design and fabrication research of the project. To develop a design strategy that builds on the concept of biomimicry to allow for complex spaces to occur that would provide attributes against the detachment of the inserted coral fragment, hence could enhance a diverse marine life specific to the context of the cities water conditions. To generate an efficient printing path that accommodates the specific morphological design criteria and ensures structural integrity and the functional aspects of the design. To develop an efficient fabrication process with a DIW 3D printing methodology that considers warping, shrinkage, and cracking in the clay material. The research team developed a method that combined an algorithmic design approach for the design of different geometries with a digital additive manufacturing process utilizing robotic 3D clay printing. The overall fabrication strategy for the complex and large pieces sought to ensure structural longevity, optimize production time, and tackle the involved double-sided printing method. Overall, 128 tiles were printed, covering roughly 40sqm of the seabed.
series ACADIA
type project
email
last changed 2021/10/26 08:03

_id acadia14projects_107
id acadia14projects_107
authors Lange, Christian; Rocker, Ingeborg
year 2014
title Density and Openess Revisited: The Ideal City of Refigured Civic Space
doi https://doi.org/10.52842/conf.acadia.2014.107
source ACADIA 14: Design Agency [Projects of the 34th Annual Conference of the Association for Computer Aided Design in Architecture (ACADIA) ISBN 9789126724478]Los Angeles 23-25 October, 2014), pp. 107-110
summary Rethinking tower typologies through computational systems
keywords Generative, parametric, evolutionary design + Artificial Intelligence in Design
series ACADIA
type Research Projects
email
last changed 2022/06/07 07:52

_id bccd
authors Lange, E.
year 1994
title Integration of computerised visual simulation and visual assessment in environmental planning
source Landscape and Urban Planning 30, pp. 99-112
summary Contributed by Susan Pietsch (spietsch@arch.adelaide.edu.au)
keywords 3D City Modeling, Development Control, Design Control
series other
last changed 2001/06/04 20:38

_id ddss9835
id ddss9835
authors Langelaan, J. Willem R.
year 1998
title Criteria for an object oriented library system of high–level parametric CADelements
source Timmermans, Harry (Ed.), Fourth Design and Decision Support Systems in Architecture and Urban Planning Maastricht, the Netherlands), ISBN 90-6814-081-7, July 26-29, 1998
summary The subject of this paper is the development of criteria and specifications for an object oriented library system of high–level parametric elements that have an integrated 2D and 3D representation. High–levelelements are virtual representations of architectural elements such as windows, doors, etc. High–level parametric elements need few components to be flexible and easily customizable. The generalization ofeach element by its characteristic parts results in a substantial reduction in the number of polygons that must be processed by the computer during the 3D transformation, graphically clean 3D images and low demandon user intervention. Gestalt theory emphasizes the importance of contour lines for the perception of an element. The “minimalist” symbolic representation will simplify contour lines that enhance perception. Theinherent flexibility and functionality of object oriented elements are augmented when the elements are rigorously developed as an object oriented library system, with classes and sub-classes of elements whichinherit characteristics of the parent–class. Attribute values of a parent–class give the user global control over all instances of that class and its sub–classes in the model’s database. The concepts which SystemsTheory uses for making an abstraction of reality are analogous to the concepts used in object oriented programming. This paper describes how Systems Theory is used as tool to develop high–level parametric elements as a functionally and computationally efficient library system.
series DDSS
last changed 2003/08/07 16:36

_id ddss9459
id ddss9459
authors Langelaan, Willem
year 1994
title Sequential and Concurrent Cad Layering
source Second Design and Decision Support Systems in Architecture & Urban Planning (Vaals, the Netherlands), August 15-19, 1994
summary Most CAD software allows graphical and text objects to be grouped into layers. There are two fundamentally different methods for layering: sequential layering and concurrent layering. With sequential layering, layers are attributes of the CAD database and objects are attributes of a layer. With concurrent layering, objects are attributes of the CAD database and a layer is an attribute of an object. Sequential layering emulates the pinbar drafting technique. As a result, it is output oriented. Only one layer at a time can be edited. Concurrent layering is uniquely a computer based layering method which has no manual equivalent. User specified sets of layers can be edited concurrently. It makes it possible to organize the infrastructure of the CAD database which equally facilitates input, i.e. editing design information, and output, i.e. presenting construction information on paper. Specification levels are related to design levels and to construction phases. Specification levels can serve as interfaces between input and output. In particular, a concurrently layered CAD database can be structured in layers which conform to specification levels. Furthermore, the layers can be subdivided by sub-system such as construction discipline, and by partial-system such as room finish schedules. It is demonstrated how a concurrently layered environment for computer aided design can be developed which permits deductive and inductive design activities. The appendix provides a detailed example of a concurrently layered CAD file with a default input and output environment of layers and layer groups. The environment was developed to coordinate the design and production activities of an architectural practice. The connections between layers and layer groups are illustrated in a 22 x 32 matrix.
series DDSS
last changed 2003/08/07 16:36

_id 5b34
authors Langendorf, R.
year 1992
title The 1990's: information systems and computer visualization for urban design, planning and management
source Environment and Planning B: Planning and Design 19, pp. 723-738
summary Contributed by Susan Pietsch (spietsch@arch.adelaide.edu.au)
keywords 3D City Modeling, Development Control, Design Control
series other
last changed 2001/06/04 20:38

_id 6960
authors Langendorf, Richard
year 1986
title Alternative Models of Architectural Practice: The Impact of Computers -- 1990 and 2000
doi https://doi.org/10.52842/conf.acadia.1986.007
source ACADIA Workshop ‘86 Proceedings - Houston (Texas - USA) 24-26 October 1986, pp. 7-27
summary Though many architectural firms have only recently begun to use computers, and most firms still do not use computers for design, it is likely that by the turn of the century computers will have transformed architectural practice. First this paper assesses the likelihood of change by examining the potential use of computers in architectural practice, summarizing technology forecasts for computer hardware, software, and standards. -However, because there is an opportunity, architectural firms will not necessarily computerize. Next is a brief review of impediments to change and the process of organizational adaptation of new technology. Finally, the paper concludes with a number of forecasts in architectural practice in 1990 and 2000. A variety of professional practice options are defined, with the suggestion that there will be increasing experimentation and diversity within the profession. Finally, the implications of these changes are explored for architectural education.
series ACADIA
last changed 2022/06/07 07:52

_id ecaade2012_045
id ecaade2012_045
authors Langenhan, Christoph ; Seifert, Arne ; Teichert, Astrid ; Petzold, Frank
year 2012
title ar:searchbox - Knowledge management for architecture students
doi https://doi.org/10.52842/conf.ecaade.2012.1.639
source Achten, Henri; Pavlicek, Jiri; Hulin, Jaroslav; Matejovska, Dana (eds.), Digital Physicality - Proceedings of the 30th eCAADe Conference - Volume 1 / ISBN 978-9-4912070-2-0, Czech Technical University in Prague, Faculty of Architecture (Czech Republic) 12-14 September 2012, pp. 639-645.
summary As media-orientation and access to media becomes increasingly widespread in society, so too is the availability of architectural designs on the internet. In most cases these are published in the form of raster images of plans, elevations and perspective drawings together with written descriptions on architecture databases and platforms such as archINFORM or nextroom, as well as on the homepages of the respective architecture offi ces. Knowledge is generally regarded as useful information. However, the literature does not elaborate clear differentiations between what is knowledge, and what is information and data. In our view it is the preparation of information in data structures that makes it useful as knowledge. Knowledge management systems are therefore intelligent information systems in which knowledge is presented and made useful through representation and modelling methods (Abeckerand Decker, 1999).
wos WOS:000330322400067
keywords Knowledge management; ontology; information retrieval
series eCAADe
email
last changed 2022/06/07 07:52

_id caadria2023_292
id caadria2023_292
authors Langenhan, Christoph, Bielski, Jessica, Ziegler, Christoph, Eisenstadt, Viktor, Althoff, Klaus-Dieter and Dengel, Andreas
year 2023
title Cross-Disciplinary Semantic Building Fingerprints ‚ AI Knowledge Graphs to Store Topological Building Information Derived From Semantic Building Models (BIM) to Apply Methods of Artificial Intelligence (AI)
doi https://doi.org/10.52842/conf.caadria.2023.1.129
source Immanuel Koh, Dagmar Reinhardt, Mohammed Makki, Mona Khakhar, Nic Bao (eds.), HUMAN-CENTRIC - Proceedings of the 28th CAADRIA Conference, Ahmedabad, 18-24 March 2023, pp. 129–138
summary The advancing digitalization in the building sector with the possibility to store and retrieve large amounts of data has the potential to digitally support planners with extensive design and construction information. Large amounts of semi-structured three-dimensional geometric data of buildings are usually available today, but the topological relationships are rarely explicitly described and thus not directly usable with computational methods of AI. To this end, we propose methods for indexing spatial configurations inspired by the similarity analysis of incomplete human fingerprints, since the early design stage of architectural design is characterized by incomplete information. For this, the topology of spatial configurations is extracted from Building Information Modelling (BIM) data and represented as graphs. In this paper, Semantic Building Fingerprints (SBFs) and Semantic Urban Fingerprints (SUFs), as well as use cases for AI methods are described.
keywords Conceptual design, building information modelling, knowledge graph, artificial intelligence
series CAADRIA
email
last changed 2023/06/15 23:14

_id ecaade2011_014
id ecaade2011_014
authors Langenhan, Christoph; Haß, Sebastian; Weber, Markus; Petzold, Frank; Liwicki, Marcus; Dengel, Andreas
year 2011
title Investigating research strategies for accessing knowledge stored in semantic models
doi https://doi.org/10.52842/conf.ecaade.2011.403
source RESPECTING FRAGILE PLACES [29th eCAADe Conference Proceedings / ISBN 978-9-4912070-1-3], University of Ljubljana, Faculty of Architecture (Slovenia) 21-24 September 2011, pp.403-411
summary Current data storage and retrieval strategies usually use keywords and are not well suited to retrieving spatial configurations, the proportions of rooms or their interrelationships. Instead of using text-based research, a graphical inquiry and query system is proposed that can recognise formal structures on the one hand and concept sketches on the other. Using artificial intelligence methods and multimodal interaction, knowledge is stored in semantic models. From previously stored planning solutions in a BIM, semantic fingerprints are derived that describe their functional and topological characteristics. The search system likewise derives a semantic fingerprint from the spatial configuration of a concept sketch and compares it with fingerprints stored in the repository. Similar matches are then shown to the designer.
wos WOS:000335665500046
keywords Knowledge management; ontology; case-based design; industry foundation classes; multimodal
series eCAADe
email
last changed 2022/05/01 23:21

_id sigradi2016_381
id sigradi2016_381
authors Langenhan, Christoph; Petzold, Frank
year 2016
title Views on architecture: Different abstraction layers of building information imply special working methods and interaction metaphors to support a variety of courses of action
source SIGraDi 2016 [Proceedings of the 20th Conference of the Iberoamerican Society of Digital Graphics - ISBN: 978-956-7051-86-1] Argentina, Buenos Aires 9 - 11 November 2016, pp.584-589
summary In the early design phases, designers usually only have a vague idea of the building they are designing. Different aspects of potential design variants need to be tested, assessed and compared with one another. The ability to consider design variants in different ways – based on floor plan, schematic concept, section or 3D visualization, for example – helps to identify problems as well as reveal areas of potential. This paper describes software prototypes developed to help designers input and present different levels of abstraction. The transformations between these levels of abstraction reveal new solutions and make designers aware of issues that need to be considered during the design process.
keywords Semantic fingerprint, Building Information Modeling, HCI, retrieval
series SIGRADI
email
last changed 2021/03/28 19:58

_id ascaad2014_030
id ascaad2014_030
authors Langenhan, Christoph; Sahm Alexander; Petzold Frank; Seifert Arne and Teichert Astrid
year 2014
title Mobile Application to Collect Information About Architecture to Obtain a Collective Knowledge Base: 'ar:searchbox.app'
source Digital Crafting [7th International Conference Proceedings of the Arab Society for Computer Aided Architectural Design (ASCAAD 2014 / ISBN 978-603-90142-5-6], Jeddah (Kingdom of Saudi Arabia), 31 March - 3 April 2014, pp. 375-382
summary During the early stages of the architectural design process, students and architects seek information for inspiration, and to evaluate design ideas or similar solutions. An essential part of design education therefore involves building up a knowledge base of already built or designed buildings. Most students gather such information by visiting or researching building designs, for example through photos taken on design studio field trips. These photos are used for studio work or archived for later use. The “ar:searchbox.app” aims to support this in two ways. Firstly, by supporting easy mobile information acquisition and sharing, as well as the semi-automatic derivation of high quality metadata; and secondly, by employing urban environment sensitive search and similarity-based browsing strategies to support mobile education as well as a web-based access to the information. To provide long-term access and to establish an information base that is not restricted to a single design studio, the “ar:searchbox.app” builds on our previous “ar:searchbox” project which uses a central media server called “mediaTUM” that provides a handling concept for flexible metadata schemas and scalable infrastructures.
series ASCAAD
email
last changed 2016/02/15 13:09

_id cf2011_p035
id cf2011_p035
authors Langenhan, Christoph; Weber Markus, Petzold Frank, Liwicki Marcus, Dengel Andreas
year 2011
title Sketch-based Methods for Researching Building Layouts through the Semantic Fingerprint of Architecture
source Computer Aided Architectural Design Futures 2011 [Proceedings of the 14th International Conference on Computer Aided Architectural Design Futures / ISBN 9782874561429] Liege (Belgium) 4-8 July 2011, pp. 85-102.
summary The paper focuses on the early stages of the design process where the architect needs assistance in finding reference projects and describes different aspects of a concept for retrieving previous design solutions with similar layout characteristics. Such references are typically used to see how others have solved a similar architectural problem or simply for inspiration. Current electronic search methods use textual information rather than graphical information. The configuration of space and the relations between rooms are hard to represent using keywords, in fact transforming these spatial configurations into verbally expressed typologies tends to result in unclear and often imprecise descriptions of architecture. Nowadays, modern IT-technologies lead to fundamental changes during the process of designing buildings. Digital representations of architecture require suitable approaches to the storage, indexing and management of information as well as adequate retrieval methods. Traditionally planning information is represented in the form of floor plans, elevations, sections and textual descriptions. State of the art digital representations include renderings, computer aided design (CAD) and semantic information like Building Information Modelling (BIM) including 2D and 3D file formats such as Industry Foundation Classes (IFC) (IAI, 2010). In the paper, we examine the development of IT-technologies in the area of case-based reasoning (Richter et al., 2007) to provide a sketch-based submission and retrieval system for publishing and researching building layouts including their manipulation and subsequent use. The user interface focuses on specifying space and their relations by drawing them. This query style supports the spatial thinking approach that architects use, who often have a visual representation in mind without being able to provide an accurate description of the spatial configuration. The semantic fingerprint proposed by (Langenhan, 2008) is a description and query language for creating an index of floor plans to store meta-data about architecture, which can be used as signature for retrieving reference projects. The functional spaces, such as living room or kitchen and the relation among on another, are used to create a fingerprint. Furthermore, we propose a visual sketch-based interface (Weber et al., 2010) based on the Touch&Write paradigm (Liwicki et al., 2010) for the submission and the retrieval phase. During the submission process the architect is sketching the space-boundaries, space relations and functional coherence's. Using state of the art document analysis techniques, the architects are supported offering an automatic detection of room boundaries and their physical relations. During the retrieval the application will interpret the sketches of the architect and find reference projects based on a similarity based search utilizing the semantic fingerprint. By recommending reference projects, architects will be able to reuse collective experience which match the current requirements. The way of performing a search using a sketch as a query is a new way of thinking and working. The retrieval of 3D models based on a sketched shape are already realized in several domains. We already propose a step further, using the semantics of a spatial configuration. Observing the design process of buildings reveals that the initial design phase serves as the foundation for the quality of the later outcome. The sketch-based approach to access valuable information using the semantic fingerprint enables the user to digitally capture knowledge about architecture, to recover and reuse it in common-sense. Furthermore, automatically analysed fingerprints can put forward both commonly used as well as best practice projects. It will be possible to rate architecture according to the fingerprint of a building.
keywords new media, case-based reasoning, ontology, semantic building design, sketch-based, knowledge management
series CAAD Futures
email
last changed 2012/02/11 19:21

_id d481
id d481
authors Langley P, Derix C and Coates P
year 2007
title Meta-Cognitive Mappings: Growing Neural Networks for Generative Urbanism
source Generative Arts conference, Milan, 2007
summary This paper examines the use of dynamic learning systems and adaptive topologies within neural networks models, and their implications as a tool for architectural mappings. The principal investigation is the ability of such systems to identify/ map/ model/ represent flows within dynamic data sets and identify topological relationships between these flows. A growing neural network [GNN] model is proposed, able to map dynamic data inputs over time. It is based on Kohonen’s early self-organising feature maps [SOM] and takes as its starting point previous work by CECA with neural networks in an architectural context, as well as other examples of neural gases, and GNNs, in order to develop a model capable of ‘autopoietic’ behaviour and ‘meta – learning’. The principal investigation is the ability of such a system to identify/ map/ model/ represent flows within dynamic data sets and identify topological relationships between these flows.

As a case study, the proposed neural network model has been used to map ‘urban territory’, as part of an on going architectural research project, based in North London. The project takes the notion of ‘urban territories’ rather than ‘urban space’ as the field for interrogation, as a description of temporal spatial occupation space, rather than spatial physical permanence. Furthermore, the GNN may be used to identify the relationships between unused and vacant sites along the street. In this way, the GNN may become a means of proposing architectural interventions for these spaces, so that the territories of those that occupy it and the negotiations between them are not lost.

keywords neural networks, adaptive topology, urban planning, generative design
series other
type normal paper
email
more http://www.generativeart.com/
last changed 2012/09/24 19:38

_id aa73
authors Langley, Pat
year 1983
title Representational Issues in Learning Systems
source IEEE Computer. October, 1983. vol. 16: pp. 47-51 : ill. includes bibliography
summary One of the central issues in artificial intelligence involves learning -- the modification of behavior through the acquisition of knowledge. The way knowledge is represented impacts the way learning occurs and indeed may determine whether learning can occur at all. The issues of learning and representation have many potential interactions. The purpose of this paper is to illuminate representational problems that may not have occurred to researchers setting out to construct self-modifying systems, and to suggest some possible solution to these problems
keywords AI, learning, knowledge acquisition, knowledge representation
series CADline
last changed 1999/02/12 15:09

_id ecaade2017_274
id ecaade2017_274
authors Lanham, Thomas, Shaifa, Irvin, Poustinchi, Ebrahim and Luhan, Gregory
year 2017
title Craft and Digital Consequences - Micro-Hybrid Explorations at (Full) Scale
doi https://doi.org/10.52842/conf.ecaade.2017.2.327
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. 327-336
summary This paper presents a comprehensive project-based research investigation that uses both drawing and modeling to challenge conventional design space. Situated at the University of Kentucky-College of Design Applied Computation Center (CoDACC) in Lexington, KY, this independent undergraduate research project reveals an immersive framework that develops, evaluates, and assesses both graphic and three-dimensional information at full scale. This research provides a framework that seamlessly negotiates analog and digital means of communication and prototyping. This paper outlines the micro-hybrid design process to frame topics germane to today's increasingly complex built environment. The paper also includes the micro-hybrid decision-making matrix and discusses the evaluation of the produced artifacts. The research demonstrates how the micro-hybrid process can reveal both the craft and consequences related to design experimentation and construction. Further, the micro-hybrid process has been shown to deepen a student's understanding of the composition of materials and a student's awareness of forces and structural loads, which in turn has produced a deeper appreciation for the principles of structures and an improved mastery of manufacturing jointing details.
keywords Digital; Pedagogy; Fabrication; Experimentation; Simulation
series eCAADe
email
last changed 2022/06/07 07:52

_id 2885
authors Lansdown, J. and Maver, T.W.
year 1984
title CAD in Architecture and Building
source Computer Aided Design, Vol 16, No 3
summary CAAD tool have gradually come into use in architecture over the past years. Appraisal and evaluation of designs and design tools and the preparation of product innovations are discussed. Types of visualisation and flexible layout programs for CAAD are assessed. The areas which knowledge-based design systems should cover are discussed .
series journal paper
email
last changed 2003/06/10 15:55

_id 59de
authors Lansdown, J.
year 1987
title The Creative Aspects of CAD: A Possible Approach
source Design Studies, (8) 2, pp. 76-81
summary Whilst it is common ground that CAD systems can help designers in many areas, what is not clear is the extent of assistance that can be provided in the creative aspects. A possible approach to creative designing with computers is that of `prototype modification'. It is possible to see all designing in terms of this approach. The distinction between innovative design and design by modification results only from the quality and nature of the prototypes and modifications involved.
series journal paper
last changed 2003/04/23 15:14

_id 4b27
authors Lansdown, John
year 1984
title Knowledge for Designers
source Architect`s journal. England: February, 1984. vol. 179: pp. 55-58
summary The first of two articles discussing expert systems. Both design and construction are carried out within the framework of empirical rules and regulations designed more for ease of implementation and checking than scientific validity. On completion of a building, little follow up research is done on the way it is used or on the way in which the assumption made in its design are borne out in practice. This present two problems: How to make information from disparate sources easily available to designers and constructors, and how to make them aware that they need this information. This paper describes how a special type of computer programming might assist in solving these problems
keywords design, construction, building, expert systems, knowledge base, systems, programming, life cycle
series CADline
last changed 1999/02/12 15:09

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