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 caadria2010_034
id caadria2010_034
authors Chung, Daniel Hii Jun and Malone-Lee Lai Choo
year 2010
title Computational fluid dynamics for efficient urban design
source Proceedings of the 15th International Conference on Computer Aided Architectural Design Research in Asia / Hong Kong 7-10 April 2010, pp. 357-366
summary Computational fluid dynamics (CFD) is a method of solving and analysing problems that involved fluid flows. In the field of architecture, urban design and urban planning, CFD is useful for the analysis of ventilation and airflow in the built environment, especially in very dense cities. This paper will look into the possibility of making CFD more accessible to the general design and planning field. A simulation is done on a urban design proposal to quickly see how air flow behaves around it. From there, it looks into the future where technology will make CFD simulation more easily adopted and the possibilities of integrating the ventilation analysis with other environmental analysis results into the urban design arena.
keywords Computational fluid dynamics; sustainability; high density; urban design; airflow
series CAADRIA
last changed 2012/05/30 19:29

_id caadria2007_689
id caadria2007_689
authors Chung, Daniel Hii Jun
year 2007
title Best Practice for Achieving Real-Time Virtual Reality Architectural Visualization
source CAADRIA 2007 [Proceedings of the 12th International Conference on Computer Aided Architectural Design Research in Asia] Nanjing (China) 19-21 April 2007
summary Real-time rendering is the most fundamental aspect of the virtual reality technology, which is always, a balance between hardware advancement and efficient software algorithm upgrades on the one hand and the demands of the quality output on the other. As architects who utilize this technology, what we can do as users is to optimize the parameters we can control in the files we input to run the simulation. Thus the identification of the few variables we can control to prevent a lagging performance or ghosting which is no longer realtime. The frame rate above all is the measurement to determine whether a simulation is real-time or not. The research aim is to identify the biggest contributing factors among the few identified. The intention is to save time and effort by optimizing the selected factors in projects so that we do not have to optimize all of them. The workflow will also be a lot faster and projects can be done efficiently. The final part is to run satisfaction tests among users to evaluate those biggest contributing factors and the qualities acceptable by users. This is to eliminate the added processing power needed to run bigger files if they do not contribute much to improved quality.
series CAADRIA
last changed 2008/06/16 08:48

_id ecaade2015_83
id ecaade2015_83
authors Fukuda, Tomohiro; Mori, Keisuke and Imaizumi, Jun
year 2015
title Integration of CFD, VR, AR and BIM for Design Feedback in a Design Process - An Experimental Study
source Martens, B, Wurzer, G, Grasl T, Lorenz, WE and Schaffranek, R (eds.), Real Time - Proceedings of the 33rd eCAADe Conference - Volume 1, Vienna University of Technology, Vienna, Austria, 16-18 September 2015, pp. 665-672
wos WOS:000372317300072
summary To improve indoor thermal environment, it is necessary to promote a lean design process, so forecasting and consensus building by experiment and numerical calculation from the design stage have become essential. Rapid advances in software and hardware allow feedback to be generated on novel design alternatives, rather than relying on simulation results based on past designs. However, this concept has not been fully verified. Therefore, this study presents an integrated design tool which consists of Computational Fluid Dynamics (CFD), Virtual Reality (VR), Augmented Reality (AR) and Building Information Modeling (BIM). The tool was applied to the problems of an actual housing design project. Both the content of design feedback on design problems revealed through simulations in the project, and the features in the feedback process were discussed.
series eCAADe
last changed 2016/05/16 09:08

_id 24fa
authors Gero, J., Damski, J, and Jun, H.
year 1995
title Emergence in CAAD Systems
source Sixth International Conference on Computer-Aided Architectural Design Futures [ISBN 9971-62-423-0] Singapore, 24-26 September 1995, pp. 423-438
summary Emergence is the process of making properties which were not explicitly represented in a computational system explicit. This paper presents two approaches to graphical emergence suitable or implementation in a CAAD system. It presents processes for shape emergence - the interpretation of shapes which were not intentionally placed there by the designer - and shape semantics emergence - the interpretation of patterns of shape into structures which were not intentionally there by the designer. Examples of both processes and their use are given.
keywords Shape Emergence, Shape Semantics Emergence, Shape Representation
series CAAD Futures
last changed 2003/05/16 18:58

_id c2eb
authors Gero, John and Jun, Han J.
year 1995
title Getting Computers to Read the Architectural Semantics of Drawings
source Computing in Design - Enabling, Capturing and Sharing Ideas [ACADIA Conference Proceedings / ISBN 1-880250-04-7] University of Washington (Seattle, Washington / USA) October 19-22, 1995, pp. 97-112
summary This paper presents an approach to the reading of the architectural semantics of drawings. Topological constraints on objects are used to represent various types of groups where the groups produce repeating patterns. A process model of visual rhythm discovery is developed. Discovery of visual rhythms in an architectural facade is demonstrated.

series ACADIA
last changed 2003/05/16 17:23

_id 2d1a
authors Gero, John S. and Jun, Han J.
year 1995
title Visual semantic emergence to support creative design: A computational view
source J.S. Gero, M. L. Maher and F. Sudweeks (eds), Preprints Computational Models of Creative Design , University of Sydney, pp. 87-117
summary One computational model of creative designing involves the introduction of new variables or schemas into the designing process. This paper describes and elaborates an approach where an emergence process is used to emerge visual semantics features in a design as it proceeds. In particular visual symmetry, visual rhythm, visual movement and visual balance are emerged. The processes of emergence introduce new variables into the design process. Emergence becomes one of the computational processes capable of playing a role in creative designing.
series other
last changed 2003/04/06 13:34

_id cf2011_p049
id cf2011_p049
authors Hii Jun Chung, Daniel; Chye Kiang Heng, Lai Choo Malone Lee, Ji Zhang
year 2011
title Analyzing the Ventilation Performance of Tropical High Density Residential Precincts using Computational Fluid Dynamics
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. 351-366.
summary Major cities in the world are getting bigger as they continue to grow to cater for more population increase. These cities normally forced the urban planning to go high density. In the tropical context, high density cities like Singapore and Hong Kong do not have the luxury of space to go low rise and compact. These cities have to build to the floor area ratio of 4 and above to cater for the population. Their only solution is to go up, as high as possible, to the extent that the natural wind flow pattern will be altered, which brings environmental impact to the people. This is generally not good since wind flow helps to maintain the thermal comfort of the people as heat and pollutants are being channeled out of the city to avoid Urban Heat Island effect. In the tropical context, wind flow is crucial to maintain people’s comfort as the temperature is generally very high from the exposure of the sun for the entire year. Studies have shown that wind flow plays the most significant part in maintaining human comfort despite exposing to direct sunlight in the tropics. Therefore, wind flow analysis is extremely crucial to make the design sustainable and energy efficient, as people will not have to depend on mechanical ventilation to compensate for the lack of wind flow. Computational Fluid Dynamics (CFD) has always been used in the field of architecture, urban design and urban planning to understand the patterns of wind flow through the built environment apart from wind tunnel tests. The availability of more powerful hardware for the mainstream computer users as well as the lowering costs of these computers made CFD more possible to be adopted in the design world today. This also means using CFD in the design process, especially to analyze the impact of the design to the current site conditions and annual wind patterns will help the new design to be more responsive to the site. The interest of this paper is to analyze the high density typologies to see how well they respond to the local wind flow pattern. A typology is considered acceptable when the wind flow going through the site is still maintaining acceptable wind speed. This means it does not block off the wind and create stagnant spaces. Different designs generate different typologies which will respond differently to the wind pattern. The study aims at comparing the local high density typologies in terms of their response to the wind. Changes to a typology can be explored too to see if the performance will be different. For a typology which is considered a total failure in terms of response to wind, it may improve its performance if the orientation is altered. The CFD software can also parametrically respond to the changes of the typologies’ dimensions. This is helpful to see how much more a typology can still be performing well before failure by increasing the floor area index. The easiest way to do this is to pump up the building height. In conclusion, designing in response to wind is extremely important as it is more sustainable and responsive to Urban Heat Island effect. A design which responds well to the wind patterns will help save cost of cooling load and fan expenditure. The people will also be more willing to use the outdoor spaces which will as a whole generate more vibrant city spaces. As a result, a high density city with huge population count can still enjoy good thermal comfort if the general urban planning and design respond well to wind.
keywords computational fluid dynamics, sustainability, high density, urban design, airflow, ventilation
series CAAD Futures
last changed 2012/02/11 18:21

_id cf2009_557
id cf2009_557
authors Hii Jun Chung, Daniel; Zhou Zhiying, Steven; Karlekar, Jayashree; Schneider, Miriam and Lu, Weiquan
year 2009
title Outdoor mobile augmented reality for past and future on-site architectural visualizations
source T. Tidafi and T. Dorta (eds) Joining Languages, Cultures and Visions: CAADFutures 2009, PUM, 2009, pp. 557- 571
summary Mobile devices have become widely used in outdoors on-the-move applications. Our research aims at developing a system which allows users to visualize the virtual buildings, streets, historic sites, landscapes or cityscapes (in the past or future) which are rendered seamlessly with the current actual scene captured by the camera (called Augmented Reality), and interactively exploring the virtual scene in real-time while the user is moving. We use the camera PDA, the GPS receiver and the gyroscope to track the mobile device’s position and orientation for virtual scene rendering. This article documents the issues regarding accurate alignment, tracking, errors and limitations with mobile devices and presents our solutions generated so far for the research in progress.
keywords Mobile augmented reality / mixed reality, virtual reality, visualization, navigation
series CAAD Futures
last changed 2009/06/08 18:53

_id cf2005_2_14_39
id cf2005_2_14_39
authors HYUN-AH Choi and HAN-JONG Jun
year 2005
title A Design Model Using Mutation Shape Emergence
source Learning from the Past a Foundation for the Future [Special publication of papers presented at the CAAD futures 2005 conference held at the Vienna University of Technology / ISBN 3-85437-276-0], Vienna (Austria) 20-22 June 2005, pp. 41-50
summary The ability to recognize properties and characteristics unforeseen in the early stage of design, namely shape emergence, is considered one of vital aspects of human visual perception in creative thinking. This study aims at developing a design model by using an extended theory of shape emergence, mutation shape emergence which we call. The first part of this paper describes the definition of mutational emergent shapes clearly. In the second part, possibility of discovering mutational emergent shapes will be explored through protocol analysis. On the basis of the results of these efforts, we will examine closely the cognitive mechanism to discover mutational emergent shapes. In the last stage, based on our results we propose a design model for understanding the cognitive process implications for training architects.
keywords creativity, design process, mutational emergent shapes, design model
series CAAD Futures
last changed 2005/05/05 05:06

_id 109caadria2004
id 109caadria2004
authors Hyun-Ah Choi, Han-Jong Jun
year 2004
title A Fundamental Study on Analysis of Interaction By Sketches and Acts of Creative Design in Architectural Design Process - Focusing on Emergent Shapes
source CAADRIA 2004 [Proceedings of the 9th International Conference on Computer Aided Architectural Design Research in Asia / ISBN 89-7141-648-3] Seoul Korea 28-30 April 2004, pp. 133-144
summary One of the characteristics of design process in the area of architectural design is the use of a number of different types of sketches. Designers place a great deal of emphasis on sketches often because it is thought to be associated with innovation and creativity. The emphasis has come to drive researchers to increasingly focus on sketch and its role in designing. Firstly, this paper is to review closely related researches that have looked at the role of sketches in design process. And then, this study is to review analogy and emergence that can be effective in facilitating creative design. Mutational emergent shapes are introduced in the last stage.
series CAADRIA
last changed 2004/05/20 16:37

_id caadria2017_062
id caadria2017_062
authors Ji, Seung Yeul, Kim, Mi Kyoung and Jun, Han Jong
year 2017
title Campus Space Management Using a Mobile BIM-based Augmented Reality System
source P. Janssen, P. Loh, A. Raonic, M. A. Schnabel (eds.), Protocols, Flows, and Glitches - Proceedings of the 22nd CAADRIA Conference, Xi'an Jiaotong-Liverpool University, Suzhou, China, 5-8 April 2017, pp. 105-114
summary In South Korea, the changing paradigm of family composition toward single-person households and nuclear families has caused the decrease in number of students, which has led to the need for change in the qualitative, rather than quantitative, management of spaces and facilities on university campuses. In particular, since 2005, the merging of universities have accelerated, which has brought up the need for a system that facilitates the management of integrated university systems. Accordingly, universities now require efficient system operation based on three-dimensional and data visualization, unlike the document-based management of facilities and spaces in the past. Users lack a sense of responsibility for public facilities, causing difficulties such as energy waste and frequent movement, as well as damage and theft of goods. This study aims to form an AR-based interface using the ANPR algorithm, a computer vision technique, and the position-based data of the GPS. It also aims to build a campus space management system to overcome the limitations of current systems and to effectively and systematically manage integrated building data. In addition, for module test verification, the prototype is applied to actual campus spaces, and additional demands for campus space management in the AR application are identified and organized.
keywords augmented reality; Campus space management; BIM; CAFM (computer-aided facilities management); user experience (UX)
series CAADRIA
last changed 2017/05/09 08:05

_id 1778
authors Jo, Jun H. and Gero, John S.
year 1995
title Representation and Use of Design Knowledge in Evolutionary Design
source Sixth International Conference on Computer-Aided Architectural Design Futures [ISBN 9971-62-423-0] Singapore, 24-26 September 1995, pp. 189-203
summary This paper describes an approach to knowledge representation for an evolutionary design process. The concept of design schemas is introduced to provide the representational framework for design knowledge. Two kinds of design schemas, the design rule schema and the design gene schema, are proposed to formulate design knowledge and interpret the knowledge into genetic codes. A design problem which is used to exemplify this approach is that of a large office layout planning problem.
keywords Representation, Design Knowledge, Genetic Codes
series CAAD Futures
last changed 2003/05/16 18:58

_id ijac20109103
id ijac20109103
authors Jun Chung, Daniel Hii; Malone-Lee Lai Choo
year 2011
title Computational Fluid Dynamics for Urban Design: The Prospects for Greater Integration
source International Journal of Architectural Computing vol. 9 - no. 1, 33-54
summary Computational Fluid Dynamics (CFD) has always been used in the field of architecture, urban design and urban planning to understand the patterns of wind flow through the built environment. Its analysis is important to evaluate whether the natural ventilation through a site is adequate to mitigate heat and pollutant to achieve better human comfort in dense urban environments. However, given the complex operational requirements, the response to wind flow is not always done early enough to support planning and design. This paper seeks to illustrate how CFD analysis can aid planning and design of urban areas and investigates the workflow requirements, in the hope of making the CFD simulations more accessible to the practices and contribute to design decisions. It also looks at the present technological advancements and future prospects to assess the scenarios where emerging technologies can make CFD simulation more readily available with affordable and even mobile hardware installations.
series journal
last changed 2011/07/04 16:00

_id 454c
authors Jun, H. and Gero, J.S.
year 1997
title Representation, re-representation and emergence in collaborative computer-aided design
source Maher, M.L., Gero, J.S. and Sudweeks, F. (eds), Preprints Formal Aspects of Collaborative Computer-Aided Design, Key Centre of Design Computing, University of Sydney, Sydney, pp. 303-320
summary Representation of drawings in CAD systems can cause problems during design collaboration. The notion of re-representation is proposed as one way of addressing these problems. Furthermore, re-representation is one way of allowing emergence to occur; emergence is an important aspect of collaborative computer-mediated design. Based on the concept of re-representation a model for collaborative CAD supporting emergence is presented and an example is demonstrated.
keywords Representation, Emergence, Collaborative CAD
series journal paper
last changed 2003/05/15 19:33

_id 3cb8
authors Jun, H.J.
year 1997
title Emergence of shape semantics of architectural drawings in CAAD systems
source University of Sydney, Department of Architectural and Design Science
series thesis:PhD
last changed 2003/02/12 21:37

_id cf2017_180
id cf2017_180
authors Jun, Ji Won; Silverio, Matteo; Llubia, Josep Alcover; Markopoulou, Areti; Chronis; Angelos; Dubor, Alexandre
year 2017
title Remembrane: A Shape Changing Adaptive Structure
source Gülen Çagdas, Mine Özkar, Leman F. Gül and Ethem Gürer (Eds.) Future Trajectories of Computation in Design [17th International Conference, CAAD Futures 2017, Proceedings / ISBN 978-975-561-482-3] Istanbul, Turkey, July 12-14, 2017, pp. 180-198.
summary This paper presents a research on adaptive kinetic structures using shape memory alloys as actuators. The target of the research is designing and building an efficient kinetic structural system that could be potentially applied at an architectural scale. The project is based on the study of tensegrity and pantograph structures as a starting point to develop multiple digital and physical models of different structural systems that can be controllably moved. The result of this design process is a performative prototype that is controllable through a web-based interface. The main contribution of this project is not any of the presented parts by themselves but the integration of all of them in the creation of a new adaptive system that allows us to envision a novel way of designing, building and experiencing architecture in a dynamic and efficient way.
keywords Responsive Structures, Kinetic Structures, Adaptive Systems, User Interaction, Structural Optimization
series CAAD Futures
last changed 2017/12/01 13:38

_id cf2007_431
id cf2007_431
authors Kiang, Tan Beng; Daniel Hii Jun Chung
year 2007
title Integrating Advanced Shader Technology for Realistic Architectural Virtual Reality Visualisation
source Computer Aided Architectural Design Futures / 978-1-4020-6527-9 2007 [Proceedings of the 12th International Conference on Computer Aided Architectural Design Futures / 978-1-4020-6527-9] Sydney (Australia) 11–13 July 2007, pp. 431-443
summary The gaming industry plays a pivotal role in creating real-time advanced shaders nowadays. With better and more affordable computer hardware, shaders are beginning to be used in other non- gaming softwares. The virtual reality visualization tools used by the architectural designers can benefit from this. This paper investigates the impact of real-time shaders on the performance of architectural virtual reality visualization of 3D models and provides a guide for architectural users to decide the optimal number of shaders to use based on the size of the model.
series CAAD Futures
last changed 2007/07/06 10:47

_id caadria2016_467
id caadria2016_467
authors Kim, Mikyoung; Seungyeul Ji, Eonyong Kim and Hanjong Jun
year 2016
title BIM-based File Synchronisation and Permission Management System for Architectural Design Collaboration
source Living Systems and Micro-Utopias: Towards Continuous Designing, Proceedings of the 21st International Conference on Computer-Aided Architectural Design Research in Asia (CAADRIA 2016) / Melbourne 30 March–2 April 2016, pp. 467-476
summary In building information modelling (BIM), the amount of in- formation increased and architectural design processes became more complex as projects expand. This is because while a collaboration en- vironment is important for smooth communication among experts, this has not been realised because of unclassified file synchronisation and permission settings among team members. Therefore, this study aims to support cooperation in BIM modelling projects by synchronising BIM data from different computers and rendering BIM project man- agement easier by providing a BIM model viewer and data through the Web. The proposed technology, which is a construction project- type, purpose-tailored browsing technology, provides BIM infor- mation related to construction environments and planning processes only to the relevant experts.
keywords Building information modelling (BIM); architectural design collaboration; process; file synchronisation; permission management system
series CAADRIA
last changed 2016/03/11 09:21

_id caadria2017_085
id caadria2017_085
authors Lee, Yong-Ju, Kim, Mi-Kyoung and Jun, Han-Jong
year 2017
title Green Standard for Energy and Environmental Design - The Development of an Assessment System Based on a Green BIM Template
source P. Janssen, P. Loh, A. Raonic, M. A. Schnabel (eds.), Protocols, Flows, and Glitches - Proceedings of the 22nd CAADRIA Conference, Xi'an Jiaotong-Liverpool University, Suzhou, China, 5-8 April 2017, pp. 623-632
summary To construct a building that meets the requirements of certification in terms of environmental friendliness, there must be a process that considers the certification criteria from the initial design phase. However, there are numerous complicated task performance procedures to analyse many required items in detail as well as perceive and apply the data requirements efficiently. Currently, Building Information Modeling (BIM) is gaining attention as a solution for environmental problems in architecture. BIM shows precisely how a virtual building is modelled in the real world, thereby providing an objective information and analysis through a simulation. However, the result values of BIM library or modelling may turn out differently as a result of the work environment of designers or users that is not standardized. Therefore, this study applies the modelled and extracted BIM data using the template and library established in the BIM add-in planning and design phase to review in advance the Green Standard for Energy and Environmental Design (G-SEED) assessment by item and manual input of users with the BIM-based (add-in) G-SEED assessment system, thereby providing support to enable users to establish specific strategies in designing green buildings.
keywords GBT; G-SEED; BIM System; BIM Add-in; Apartment
series CAADRIA
last changed 2017/05/09 08:05

_id cf2015_484
id cf2015_484
authors Liao, Kai; Vries, Bauke de; Kong, Jun and Zhang, Kang
year 2015
title Pattern, cognition and spatial information processing: Representations of the spatial layout of architectural design with spatial-semantic analytics
source The next city - New technologies and the future of the built environment [16th International Conference CAAD Futures 2015. Sao Paulo, July 8-10, 2015. Electronic Proceedings/ ISBN 978-85-85783-53-2] Sao Paulo, Brazil, July 8-10, 2015, pp. 484.
summary In this paper, we review and extend the idea of Alexander’s “pattern language”, especially from the viewpoints of complexity theories, information systems, and human-computer interaction, to explore spatial cognition-based design representations for “intelligent and adaptive/interactive environment” in architecture and urban planning. We propose a theoretic framework of design patterns “with spatial information processing”, and attempt to incorporate state-of-the-art computational methods of information visualization/visual analytics into the conventional CAAD approaches. Focused on the spatial-semantic analytics, together with abstract syntactic pattern representation, by using “spatial-semantic aware” graph grammar formalization, i.e., Spatial Graph Grammars (SGG), the relevant models, algorithms and tool are proposed. We testify our theoretic framework and computational tool VEGGIE (a Visual Environment of Graph Grammar Induction Engineering) by using actual architectural design works (spatial layout exemplars of a small office building and the three house projects by Frank Lloyd Wright) as study cases, so as to demonstrate our proposed approach for practical applications. The results are discussed and further research is suggested.
keywords Pattern language, complex adaptive systems, spatial cognition, design representations, spatial information processing, Artificial Intelligence, visual language, Spatial Graph Grammars (SGG), spatial-semantic analytics.
series CAAD Futures
last changed 2015/06/29 05:55

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