Welcome
Digital library of construction informatics
and information technology in civil engineering and construction
 

Works 

Search Results

Facilitated by the SciX project

Hits 51 to 60 of 141

G. Atasoy, P. Tang & B. Akinci

A comparative study on the use of laser scanners for construction quality control and progress monitoring purposes

Abstract: Laser scanning is an emerging technology used on construction sites for defect detection and progress monitoring. Most previous studies in this domain use data from a single scanner while discussing various data collection, processing and accuracy analysis strategies. With the purpose of comparing the technical characteristics of two scanners and identifying the challenges of using them on construction sites, we conducted a case study on indoor laser-scanning of one floor of a five-storey commercial building in Pittsburgh/PA/USA during its construction. The two scanners used in this study adopt two different positioning techniques: pulsed-time-of-flight (obtaining the distance to an object by timing the round-trip traveling-time of the laser) and amplitude-modulated-continuous-wave (comparing the phases of emitted and received signals for indirect measurements of laser traveling time). For each tested scanner, we highlight its unique advantages and technical challenges, as well as relevant technical trade-offs regarding their utilization on a construction-site for quality control and progress monitoring purposes. 

Keywords:

DOI:

Full text: content.pdf (390,917 bytes) (available to registered users only)

Series: w78:2009 (browse)
Cluster:
Class:
Similar papers:
Sound: N/A.


Goncalves R, Pimentao J, Vital M, Sousa P, Silva H, Steiger-Garcao

Integrating applications for the construction industry using a STEP-based integration platform (SIP)

Abstract: International construction industry has not still achieved a high degree of integration and automation in the past years. The European ESPRIT III project number 6660, RoadRobot (Operator Assisted Mobile Road Robot For Heavy Duty Civil Engineering Applications) intends to design and to implement an architecture to support the integration and automation tasks in that domain. To aid the implementation of the architecture, a STEP-based (ISO 10303) platform for integration of applications (SIP toolkit), was developed by UNINOVA. The general purpose of SIP is to assist the achievement of standardised Computer Integrated Manufacturing (CIM) environments, providing a set of development system tools. Last year, during CIB W78 and TG10 held at the University of Stanford - California (USA), SIP and the aim of the RoadRobot project were presented. During the CIB‘96, the RoadRobot architecture and its achieved results will be shown, as well as the improvements of SIP made in order to meet the project requirements. Special care will be taken concerning the problems found and the solutions adopted.

Keywords:

DOI:

Full text: content.pdf (113,530 bytes) (available to registered users only)

Series: w78:1996 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.software-machine (0.020476) class.environment (0.018161) class.man-man (0.017124)
Similar papers:
Sound: read aloud.

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.


Hassanain M A, Froese T M, Vanier D J

Information analysis for roofing systems maintenance management integrated system

Abstract: The Building Envelope Life Cycle Asset Management (BELCAM) project, lead by the National Research Council Canada (NRCC) and Public Works and Government Service Canada (PWGSC), is a "proof of concept" project aimed at helping asset managers to predict the remaining service life of building envelope components and to maximize the return on their maintenance expenditure. The BELCAM project focuses on flat or lowslope conventional roofing systems as a representative domain. This paper focuses on maintenance management, which is primarily concerned with the management of all technical and administrative tasks involved in maintaining a building element in, or restoring it to, a state in which it can perform its intended function. A framework for the integration of the process of managing maintenance of roofing systems is proposed. The framework consists of five sequential steps: (1) Identification of roofing system components requiring assessment, (2) Identification of roofing system performance requirements, (3) Identification of performance assessment methods, (4) Roofing system maintenance planning, (5) Roofing system maintenance operations management. This paper introduces a framework for roofing systems maintenance management. It presents a preliminary analysis of an integrated information system to support maintenance management. The paper follows the development methodology adopted by the International Alliance for Interoperability (IAI) to represent the high-level information within the proposed framework of maintenance management. IAI projects follow a standard process-oriented development methodology, involving the following steps: usage scenarios, process definitions, information analysis and information modeling and validation.

Keywords:

DOI:

Full text: content.pdf (87,919 bytes) (available to registered users only)

Series: w78:1999 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.processing (0.013504) class.represent (0.012912) class.analysis (0.011741)
Similar papers:
Sound: read aloud.

Permission to reproduce these papers has been graciously provided by the Research Press of the National Research Council of Canada. The support of the editors, particularly Dr. Dana Vanier, is gratefully appreciated.


Hauser M, Nollau C, Scherer R J

Intelligent design tools as product model interfaces

Abstract: Concurrent engineering is understood as a methodology that can be used to increase quality and reduce design effort and time-to-market of a product. Main aspects of concurrent engineering are information sharing among multiple design agents and problem solving actions. Associated techniques are product models and intelligent design tools. In the paper the interrelationship of product modelling technology and intelligent design support is reviewed. A practical contribution to concurrent engineering by using design tools as intelligent interfaces to product models has been done by the authors. The paper describes the concept and prototypic implementation of two knowledge-based design tools in the domain of structural design. The tools form integrated parts of a design environment linked via a central product model.

Keywords:

DOI:

Full text: content.pdf (194,267 bytes) (available to registered users only)

Series: w78:1996 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.analysis (0.035359) class.man-software (0.027242) class.represent (0.016372)
Similar papers:
Sound: read aloud.

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.


Hegazy T, Moselhi O, Fazio P

Managing construction knowledge in patterns: a neural network approach

Abstract: Neural networks are AI-based computational tools with powerful capabilities of effective capturing and re-use of domain knowledge that are inherently implicit. This paper describes the modelling capabilities of neural networks with respect to construction problems, emphasizing the advantages associated with their representation of knowledge in the form of patterns. Several aspects related to proper management of knowledge are addressed for the purpose of developing practical and more reliable neural network models of complex construction problems. These aspects include: 1) problem structuring and patterns formation; 2) knowledge acquisition and data validation; 3) preparation and transformation of acquired data; and 4) analysis and interpretation of network state of knowledge. Guidelines pertaining to these aspects are provided along with considerations for modelling with noisy data and under high degree of uncertainty. The issues discussed are illustrated through a case study of a neural network for bidding decision support, developed based on knowledge acquired from contractors in Canada and the US. The case study demonstrates neural network modelling and illustrates the benefits gained through better management of acquired knowledge.

Keywords: neural networks; knowledge acquisition; construction; information technology; bidding strategy

DOI:

Full text: content.pdf (644,899 bytes) (available to registered users only)

Series: w78:1993 (browse)
Cluster:
Class:
Similar papers:
Sound: read aloud.

Permission to reproduce these papers has been graciously provided by the National University of Singapore. The assistance of the editors, particularly Prof. Martin Betts, is gratefully appreciated.


Hemio T, Salonen M

Virtual reality: human interface to product data

Abstract: "Product models are far too complicated for everyday users to browse or edit without a graphical user interface hiding the complexity of the data structure. Public domain virtual reality browser can be used as an interface to a background application, like ProMoTe, capable of launching other applications like CAD programs, word processors, spread sheets and instance editors. All data linked to an instance can be browsed and edited by simply pointing the instance from the VR model and then selecting preferred operation from a popup menu. This enables editing of data in the model itself and editing of all external files linked instances. If the product model is accessed through the Internet, VR model provides an ultra light interface to the shared model. When user makes a request to the server, it automatically generates a new VR model according to specifications in the data model. Downloading the generated VR model, user can select the instance he wants to browse. The actual transfer of data is controlled by the background application, which provides all the functionality required for the connection to the server. Also control over downloaded data, including the capability of launching the required applications for linked files, is provided by this background application."

Keywords:

DOI:

Full text: content.pdf (531,649 bytes) (available to registered users only)

Series: w78:2000 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.man-software (0.061742) class.represent (0.032886) class.bestPractise (0.018806)
Similar papers:
Sound: read aloud.

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


Hengwei Wang, Jiarui Lin and Jianping Zhang

Operation-Level 4D Modeling and Visualization for Modular Building Based on Standard Activity Library

Abstract: Modular or prefabricated building plays an important role in lean construction and green building. Building information modeling and 4D bring a new paradigm for data modeling and visualization in the Architecture, Engineering and Construction domain. Meanwhile, lots of time was consumed when modeling and visualizing the dynamic construction process based on 4D. It takes more time to create an operation-level 4D model for technical specification, that always adopted to ensure the quality and safety. Given that modular or prefabricated building projects have lots of similar construction activities, this paper proposed a 4D modeling and visualization approach for modular building, which can persist generalized construction activities and operations in standard activity library and fully utilize them in schedule detailing and visualization. The approach is designed and applied based on previous researches and applications of 4D BIM and has been used in a practical project of modular residential project to illustrate the feasibility of the work and the possibility of future research.

Keywords: 4D Modeling, Operation Level, Building Information Model, Modular Building, Prefabricated Building

DOI: https://doi.org/10.24928/JC3-2017/0287

Full text: content.pdf (2,468,226 bytes) (available to registered users only)

Series: jc3:2017 (browse)
Cluster:
Class:
Similar papers:
Sound: N/A.


Ipek Gursel, Rudi Stouffs, Sevil Sariyildiz

A computational framework for integration of performance information during the building lifecycle

Abstract: Optimal indoor environments in terms of thermal comfort and indoor air quality are essential to maintain healthy and productive spaces. To address the high occupant comfort and energy efficiency requirements, advanced HVAC systems that have narrow performance boundaries are used. It is crucial to achieve the satisfactory operational level for systems and buildings by the adoption of performance based verification strategies. Performance-based approach requires the continuous verification of the actual performance against objectives during the building lifecycle. Building commissioning, building energy management systems (BEMS) and operations and main-tenance are effective tools to verify optimum building performance and have the potential to embed performance as-sessment into the building lifecycle. However, transfer of performance information from one method or building phase to another is difficult. A considerable amount of valuable information is lost due to the lack of an integrated framework that bridges different islands of information. This becomes most problematic during the operational phase, where de-sign data and performance trends are the main basis for decision making for facilities management staff. To achieve a persistent performance evaluation across phases and stakeholders, a flexible and seamless communication infrastruc-ture across disciplines and processes is necessary. The software architecture for a continuous performance verification and communication environment for indoor cli-mate and ventilation systems is introduced. The purpose of the model is to provide a framework that integrates commis-sioning, BEMS monitoring and inspection/maintenance activities, to avoid erosion of domain information during hand-overs and over time. The model retains continual information of building and makes this information available during building operations and [re]commissioning. A formal relationship structure is proposed between performance indices to support traceability of design and operations decisions. The paper will be concluded with reflections into the future work, which includes implementation and proposed strategies for validation of the model by test cases.

Keywords: building lifecycle performance assessment, building commissioning, BEMS

DOI:

Full text: content.pdf (741,211 bytes) (available to registered users only)

Series: w78:2007 (browse)
Cluster:
Class:
Similar papers:
Sound: N/A.


Ivan Mutis, Jose Solis

FLOORBOOK: A Social Network System to Enable Effective Interfacing of Project Actors

Abstract: Construction project participants constitute a complex social human network composed of a heterogeneous and fragmented set of stakeholders. The disjoint group of actors that team to work on a project constitutes collective entities, social networks at different scales in time and space. The proposed social network system is a semantic resource that leverages the communication and coordination of exchanging and sharing information. It is expected that it will enable an improvement in efficiency of the interfacing of actors and information. This semantic resource helps actors to minimize human intervention for coordination and information searching and retrieval, which are activities that demand costly resources and the use of specialized labor. Floorbook analyzes the vocabulary of the annotations on the forms of representation used in construction documentation, categorizes and models communities according to the user’s role in the shared form of representation, and makes suggestions to the users to optimize their particular world view, so that the suggested annotation is more precise and personalized. The basic rational of the approach is that the position of the users in a social network impacts their use in the system, and that the content of the annotations are part of a categorization model of a specific domain. The proposed social network system works as an effort of collective intelligence that enables the sharing of the semantics of the tags that are associated with the representations. As an effort of collective intelligence, Floorbook (1) models and extracts semantics from informal communication; (2) categorizes and models communities defined by common interests; and (3) self-learns from the history of user actions in the system to enable new value-added services, such as, for example, suggesting new candidate semantic tags as a result of the analysis of the representations to optimize the particular world view of an individual user.

Keywords: social-networking, communication, collaboration, emerging semantics

DOI:

Full text: content.pdf (238,264 bytes) (available to registered users only)

Series: w78:2010 (browse)
Cluster:
Class:
Similar papers:
Sound: N/A.


Ivan Mutis, Raja R.A. Issa, Ian Flood

Missing fundamental stratum of the current forms of the representation of concepts in construction

Abstract: The generation of concepts in the construction industry involves the interpretation of syntactically defined symbolic notations, such as logic, frames, semantic networks, natural language, and of other forms such as visual rep-resentations. These notations are deliberately organized to define concepts. Models as forms of representations are based on symbols that are aimed at referring to some entities of the world with properties and relations apprehended within them. Models involve grouping a set of relations, which characterize concepts, with the purpose of sharing and understanding these concepts by members of the community. However, models suffer the limitations that logic and the symbolic notations bear, because they cannot capture the richness of the phenomena of the world in their syntactic no-tation nor other intentionality features. Other forms of representations such as visual representations suffer the same limitations. An analysis of the nature of the representations employed in the construction industry suggests the inclusion of the ac-tor’s role in a new stratum for generating representations of construction concepts. This actor, who manipulates or generates the representation for communicating concepts, is committed to the intentionality aspects of the represented concept that are not captured in current forms of the representation. The inclusion of these and other phenomenological aspects concerning the nature of the representation are intended to generate representations for accurate interpreta-tions. The modus operandi with these representations indicates a subsequent interpretation by other actors or project participants. The inclusion of this stratum promises a significant progress in creating efficiency in interoperability on construction projects. The assumption is that the representations are cognitive manifestations of common, shared con-cepts employed by the construction industry community. This analysis is supported and developed through the semiotic theory which addresses the nature of the representations through signs and the role of agents with the representations and with the external physical domain. This study attempts to approximate semiotics as an experience that illustrates the reasoning process from external rep-resentations and the role of intentionality in employing external representations. This experience inquires about the form of the correspondence of the perceived, entity, event, and relations, or, in other words, a correspondence of a phe-nomenon in the world with the concept in the construction participant’s mind. In addition, the purpose of this experi-ence is to provide direction to the method of how semantics aspects should be understood to give interpretations for concepts employed in the construction industry.

Keywords: semiotics, construction concepts, representations, interpretation

DOI:

Full text: content.pdf (1,090,655 bytes) (available to registered users only)

Series: w78:2007 (browse)
Cluster:
Class:
Similar papers:
Sound: N/A.


For more results click below:

 

hosted by University of Ljubljana



includes

W78




© itc.scix.net 2003
show page 1 show page 2 show page 3 show page 4 show page 5 this is page 6 show page 7 show page 8 show page 9 show page 10 show page 11 ... show page 15 Home page of this database login Powered by SciX Open Publishing Services 1.002 February 16, 2003