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C Lu, S Lu, X Wang

Wind-Induced Dynamic Analysis of the Arched Tensegrity Structures in Time Domain

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Series: w78:2014 (browse)
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Chang T W, Woodbury R

Geometric typed feature structures: carrying geometric information using typed feature structures

Abstract: This paper explores Geometric Typed Feature Structures as a concept for carrying geometric information based on the theory of Typed Feature Structures[Carpenter, 1992]. Geometric Typed Feature Structures cover an important aspect of design space explorers in which the symbol level representation must carry 3D geometric information. Order Types are the devices in Geometric Typed Feature Structures that carry the continuous infinite domain information, that is, geometry. In this paper, theories and algorithms are applied to two kinds of Order type examples for carrying numerical values and geometric information. We describe the requirements as well as the conditions in which an Order Type can be specified and synchronized with other domain knowledge. We show two examples of Order Types: lifted reals and IGOSet intervals based on the theory of Geometric Typed Feature Structures. In each example, we outline the mathematics linking it to the theory of Order Types.

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Full text: content.pdf (368,172 bytes) (available to registered users only)

Series: w78:2000 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.synthesis (0.015180) class.analysis (0.006844) class.social (0.006257)
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Permission to reproduce these documents have been graciously provided by Icelandic Building Research Institute. The assistance of the editor, Mr. Gudni Gudnason, is gratefully appreciated


Chen Y Z, Maver T W

Supporting interaction within virtual studios

Abstract: In this paper the author describes the development of a virtual studio environment, which is intended for supporting communications for both dispersed human designers and distributed CAD applications. By applying the metaphor of the real world design studio, a virtual studio model has been defined as an electronic locale in the computer networks, which contains distributed resources and is inhabited by dispersed designers. Virtual studio environment (VSE) has then been proposed to refer to such a multi-user environment which supports the creation, operation and management of virtual studios. A distributed implementation architecture, which loosely couples the domain resources with the VSE base system through resource agents, has been designed. Conceptual building design has been chosen as the application domain for prototyping. Several typical scenarios of interaction with VSE will be discussed. One of the prominent features of this system is that the supported interaction takes place within, instead of through or external to, the design systems.

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Full text: content.pdf (131,564 bytes) (available to registered users only)

Series: w78:1996 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.man-software (0.033732) class.environment (0.020579) class.communication (0.018678)
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Permission to reproduce these papers has been graciously provided by the University of Ljubljana. The assistance of the editor, Prof. Ziga Turk, is gratefully appreciated.


Chen Y, Amor R

Identification and classification of A/E/C web sites and pages

Abstract: Current search engines are not well suited to serving the needs of A/E/C professionals. The general ones do not know about the vocabulary of the domain (e.g., so 'window' is a meaningless word) or rely on human classification (which severely limits the percentage of sites which are indexed). Domain specific databases and hot lists tend to be the only other option. While these have very good information they reflect a very small proportion of what is on the web. This paper looks at a system for automated classification of web sites and pages in the A/E/C domain. In particular, we concentrate on web sites and pages in New Zealand, and use the common classification system for the New Zealand construction industry (CBI). For this particular problem it is clear that no single approach to classifying web information gives a perfect answer. We therefore combine several approaches for automated classification, including: · Identifying web sites that are already classified by other Internet portals and mapping these classifications to the CBI classification system. · Extracting keywords from web pages and sites and then finding the relationships between the extracted keywords and topics in the CBI classification system. · Using link analysis to find related web pages on a certain topic in the CBI classification system. When an A/E/C professional searches with our system we determine metrics for each approach above, and find the best combination of approaches to determine a classification and hence the resultant web sites and pages. This paper describes the components of the search engine which has been created and provides an analysis of the classification approaches.

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Full text: content.pdf (171,531 bytes) (available to registered users only)

Series: w78:2002 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.collaboration (0.067651) class.retrieve (0.043347) class.man-software (0.025151)
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Permission to reproduce these documents have been graciously provided by the Aarhus School of Architecture, Denmark. The assistnace of the editor, Prof. Kristian Agger, is gratefully aprecciated.


Cheng J,Deng Y,Du Q

Mapping between BIM models and 3d GIS city models of different levels of detail

Abstract: Modeling the built environment of a city digitally in three dimensions can support navigation, urban planning, disaster management, and energy consumption analysis. City Geography Markup Language (CityGML) was developed in recent years as a Geographic Information System (GIS) data standard to represent the geometry and geographical information of buildings in digital 3D city models. CityGML supports modeling on various Levels of Detail (LoDs) from simple box models to models with interior partitions. This paper presents the theoretical framework that we have developed for mapping between Building Information Modeling (BIM) models in the Industry Foundation Classes (IFC) format and CityGML models of different LoDs. The framework consists of two major parts – (1) transformation between BIM models and high level CityGML LoD4 models, and (2) harmonization among the four LoDs of CityGML. For the first part, a reference ontology was developed to transfer semantic information between BIM models in the IFC format and CityGML models. To reduce the file size of the generated CityGML models, a new geometric transformation algorithm was developed for the mapping from Swept Solid or Constructive Solid Geometry (CSG) representations, which are commonly used in BIM models, to Boundary Representation (BRep) which is used in CityGML models. For the second part, schema mediation techniques are used to convert CityGML models from one LoD to another LoD. Based on the reference ontology, an application domain extension (ADE) called “Semantic City Model (SCM)” was developed for CityGML. The SCM ADE enriches CityGML models by providing more semantic information such as the linkage relationship between walls and building stories. This paper presents the developed mapping framework with an illustrative example of a residential building.

Keywords: 3D city models,Building Information Modeling (BIM),Geographic Information System (GIS),Industry Foundation Classes (IFC),Schema mapping

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Full text: content.pdf (807,385 bytes) (available to registered users only)

Series: convr:2013 (browse)
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Christopher Raghubar, Nima Shahbazi, Brandon Bortoluzzi, Aijun An and J.J. McArthur

Integrating Visual Analytics and Machine Learning Into BIM-Enabled Facilities Management.

Abstract: Building Information Modelling is becoming increasingly used for Asset Information Management in Facility Operations, where semantic and relational information are of primary importance. "Big Data" analytics tools provide new opportunities within this domain to classify and synthesize data, integrate it with the Computer-Aided Facilities Management system, and develop predictive models to assign priority and resources to address issues arising. The resulting information integrated into building information models provides a powerful tool for facilities management teams to prioritize and streamline operations and maintenance tasks.This paper presents the development, comparison, and application of two supervised machine learning models to classify and evaluate maintenance requests generated both from within the maintenance team and occupant complaints. Three algorithms: Term Frequency (TF), Term Frequency-Inverse Category Frequency (TF-ICF), and Random Forest are used to analyse the text of the maintenance request description and assign problem types to each. Approximately 150,000 historical maintenance requests were used for model development and the models have overall prediction accuracies of 69%, 70%, and 90% for problem type prediction, respectively.

Keywords: Machine Learning, Building Information Modelling, Visual Analytics, Facility Management, Predictive Models, Big Data

DOI: https://doi.org/10.24928/JC3-2017/0143

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Series: jc3:2017 (browse)
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Ciftcioglu O, Durmisevic S, Sariyildiz S

Building design support by hierarchical expert networks

Abstract: "Rapid advances in parallel processing technologies gave essential impetus to intelligent information processing, which became the driving source of an emerging technology known as soft computing. This calls for intelligent systems that are able to process information which may be complex, uncertain even incomplete or contradictory. In this context, neural networks and fuzzy logic are the essential tools. Considering the merits of each approach separately, most suitable computational intelligence method can be used for a specific application. Additionally, the combination of these methods can provide enhanced information processing for decision-making with enhanced reliability. For building design, the computational intelligence system use a knowledge base formed by means of neural network and fuzzy logic (neuro-fuzzy) techniques, from a building design database. The application of such a system to a building design task was preliminarily demonstrated earlier [1]. The present research describes a systematic neural fuzzy modelling of data that form a knowledge base in a hierarchical form (s.figure below). Each sub-knowledge base represents a local expert, being level-one expert and the association of local experts forms a more comprehensive expert that becomes a global domain expert as level-two. The association of the experts is accomplished by means of fuzzy-logic-driven gating network that performs, the information handling as required. Although, the present paper describes two-level hierarchical experts as local and global, the associations can be done in more subtle form, i.e., in more than two steps so that the level of experts can be categorised in multi-level form. In such more complex structures, multi-level experts require related gating network that could similarly be designed. The building design support system with the expert network developed, as a whole, is generic enough for decision-makings with a novel systematic approach concept using appropriate database. Accordingly, the research deals with a particular architectural building design with efficiency and consistency features using the hierarchical expert network system described [1] Ciftcioglu O, Sariyildiz S. and Veer P. v.d., 1998 , Information Ordering for decision support in building design, D and DSS, Design and Decision Support Systems 4th International Conference on Design and Decision Support Systems in Architecture and Urban Planning, Castle Vaeshartelt, Maastricht, July 26-29, The Netherlands"

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Full text: content.pdf (519,213 bytes) (available to registered users only)

Series: w78:2000 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.analysis (0.064229) class.synthesis (0.019630) class.man-man (0.013152)
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Permission to reproduce these documents have been graciously provided by Icelandic Building Research Institute. The assistance of the editor, Mr. Gudni Gudnason, is gratefully appreciated


Conheeney K, Stephenson P, Griffiths A

Issues in knowledge transfer within a construction training and learning organisation

Abstract: "Knowledge transfer with domains such as the construction industry will become increasingly important. Essentially 'transfer' involves the sharing of 'best-practice' between the minority of experienced experts and the majority of those people as recipients. Some means of capturing this information and then applying this to a problem context defines the 'knowledge' component. Three pragmatic issues to the delivery of a variable knowledge transfer system are required and should include the collection, structuring and transferring of information. This paper identifies the issues concerned and the need to establish solutions for a construction training and learning organisation. Particular issues addressed include indexing and the use of XML language for the interchange and sharing of data, and the capture of XML structures within a relational schema for comparisons and queries. Additionally, mechanisms for establishing navigational trails are considered with neural networking for the building of knowledge domain structures for continued extension and navigation in knowledge transfer. The need to take into account organisational and market culture is significant to provide value information and the trade of information. The issues highlighted and discussed indicate a need for manual (human) and automated (neural) processing for the collection, structuring and transfer of information to promote the learning organisation concept, and to provide the opportunity for knowledge utilisation within an organisational environment."

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Full text: content.pdf (209,099 bytes) (available to registered users only)

Series: w78:2000 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.bestPractise (0.171597) class.education (0.135365) class.analysis (0.042236)
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Permission to reproduce these documents have been graciously provided by Icelandic Building Research Institute. The assistance of the editor, Mr. Gudni Gudnason, is gratefully appreciated


Cutting-Decelle AF

Standardization in product and process data modelling : the ISO step and mandate standards' contribution to'the integration of the life-cycle of buildings

Abstract: In this paper, the data exchanges during the construction process will be analysed through the presentation of the specificity of the profession, -and the description of the construction process, by means of the merent related models. We will then present the two standards, STEP and MANDATE, both currently under development, first in their main features, then by the concepts they will be able to provide. We will focus on a presentation of MANDATE, since one of the models provided could be useful for the representation of the life cycle of buildings. This paper will end with some perspectives for the building construction domain, based on the integration of the whole construction process.

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Full text: content.pdf (1,962,640 bytes) (available to registered users only)

Series: w78:1995 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.represent (0.049820) class.processing (0.023990) class.standards (0.019855)
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Permission to reproduce these papers has been graciously provided by the Stanford University, USA. The support of the editors, particularly Prof. Fischer is gratefully appreciated.


D Ilter

A SYSTEM OF SYSTEMS (SOS) APPROACH TO DISPUTE

Abstract: There has been an increasing attention towards more effective dispute avoidance and resolution in the construction industry due to the significance of the costs associated with disputes. Many researchers have attempted to develop systems that aim to manage disputes by providing dispute evaluation, negotiation support, litigation prediction and decision support through the use of various tools. Although these systems have been developed separately, a careful consideration shows that they can be incorporated into a meta-system that pools their resources and capacities to obtain more functionality and performance. This aim fits well with the System of Systems (SoS) approach, which includes incorporating a collection of independent and task-oriented systems into a new, more complex system offering more utility than the sum of the constituent systems. After analysing current dispute management systems in the literature, a framework has been developed for the integration of these systems by SoS approach. The primary objective of developing a SoS framework is modelling the opportunities of cooperation while maintaining independence of the constituent systems, and exploring new systems required in an evolving perspective for a holistic management of disputes in the construction domain. The findings reveal that SoS represents a structured and comprehensive approach to modelling dispute management systems as a networked meta-system. SoS approach provides mechanisms to analysing and classifying existing systems, modelling the opportunities of cooperation between the constituent systems, adding or subtracting systems to and from the system in evolution, and maintaining the same amount of management and resources as before with more precise results from each system. As a result, the effectiveness of the constituent systems is expected to increase due to interoperability and resource sharing in the SoS framework.

Keywords: Dispute resolution, Dispute management systems, System of systems (SoS) approach.

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Series: w78:2011 (browse)
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