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Bella Nguyen and Ioannis Brilakis

Minimising Misclassifications of Over-Height Vehicles Due to Wind

Abstract: Over-height vehicle strikes with low bridges and tunnels are an ongoing problem worldwide. While previous methods have used vision-based systems to address the over-height warning problem, such methods are sensitive to wind. In this paper, we propose a constraint-based approach to minimise the number of over-height vehicle misclassifications due to windy conditions. The dataset includes a total of 102 over-height vehicles recorded at frame rates of 25 and 30 fps. At this frame rate, we analysed sampling rates to determine the sufficient number of positive frames required to provide accurate warnings to drivers. Optical flow and KLT feature-tracker algorithm was used to detect and track feature points of motion. Motion captured within the region of interest was treated as a standard two-class binary linear classification problem with 1 indicating over-height vehicle presence and 0 indicating noise. The algorithm performed with 100% recall, 83.3% precision and false positive rate of 8.3%.

Keywords: Bridge Strike, Tunnel Strike, Over-Height Vehicle, Over-Height Vehicle Detection System, Bridge Strike Prevention

DOI: https://doi.org/10.24928/JC3-2017/0249

Full text: content.pdf (3,818,410 bytes) (available to registered users only)

Series: jc3:2017 (browse)
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Drogemuller R, Woodbury R, Crawford J

Extracting representation from structured text: initial steps

Abstract: A great deal of work has been done in the past on natural language recognition within the field of artificial intelligence. The aim of this work was to allow natural language text to be read in by a computer and structured in a format that would allow automatic interpretation of the text. This was intended to reduce the "knowledge engineering bottleneck" that has been a significant constraint on the use of artificial intelligence techniques within many fields. Some similar work has also been done within the AEC industry concentrating mainly on building codes. The research project described in this paper aims to simplify the analysis of structured text and its conversion into computer interpretable forms by providing support with computer software. The work is built around two documents - a glossary of building terms used in Australia and the Building Code of Australia. The various issues concerned with "noise" in the source data, the structure and content of documents to be analysed and the desired computer interpretable result will be presented. This work is motivated by: · the need to maintain BCAider, a knowledge based system that assists in checking building designs for compliance with the Building Code of Australia; · continuing work in encoding of regulations in computer interpretable form; and · the need for international glossaries to support information harmonisation efforts such as the IAI and STEP. The software suite under development assists people with some understanding of language structure and knowledge engineering in converting structured text into computer interpretable form using a visual user interface. The current state of the design and development of this software suite will be described and the results of its use presented.

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Full text: content.pdf (262,275 bytes) (available to registered users only)

Series: w78:2000 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.retrieve (0.070694) class.analysis (0.045357) class.man-software (0.038615)
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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


Moore D R

Perception "noise" in the cognition of visualised construction process concepts

Abstract: Within the context of a scoping study the paper examines factors having a possible effect on the nature of cognition achieved with regard to specific construction industry production process concepts. These factors are considered with regard to the level of cognition, as a follow-on from the act of visual perception, that may be achieved by individuals with regard to production process concepts. The key production concepts considered are those of the extent of continuous specific interdependency (CSI) and discontinuous specific interdependency (DSI), as determined through assessing type and extent of discontinuities between construction activities linked by the process logic to form process chains. Existing means of visualising dependencies within and between projects are argued to be deficient with regard to their ability to communicate relationships such as discontinuous specific interdependency. Existing HCIs, for example, are suggested as simply seeking to replicate means of visualisation that are historically established, such as the bar chart, CPN, PERT, etc. This approach is considered within the paper from the perspective of the suggested differing abilities of experts and novices to "fill-in" the gaps presented in the context of communicating relationships such as DSI. The use of a structured entity approach to enhance the communication of concepts such as interdependency through the visualisation of relevant characteristics of individual activities is proposed. This entity is developed from work carried out in areas of research such as thinking with diagrams (TWD), knowledge maps, and the theories of perception with regard to pattern recognition. The suggested entity also seeks to maximise the value of current HCIs rather than imposing a radically new means of visualisation on project planning software.

Keywords: Perception, near-criticality, interdependency, visualisation, TWD, structured entities.

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Full text: http://www.itcon.org/2002/10 (available to registered users only)

Series: itcon:2002 (browse)
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Pei Liu, Shih-Huang Chen, Cheng-Yen Wu

Evaluation Of Effects Of Noise Barrier Defects On Their Noise Reduction Efficiencies

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Full text: content.pdf (652,824 bytes) (available to registered users only)

Series: w78:2006 (browse)
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Sebastian R,Böhms M,van den Helm P

BIM and GIS for low-disturbance construction

Abstract: Construction and maintenance activities of bridges often bring negative impacts to the urban environment in terms of disturbance, traffic jams and disruptions, noise, dust, and air pollution. Lack of coordination between the stakeholders in strategic, tactical and operational construction planning process has been identified as a key factor behind these negative impacts. Attempts to solve this issue critically depend on an effective interoperability between ICT tools from the building domain (based on Building Information Model or BIM) and the urban planning domain (based on three dimensional Geographical Information System or 3D GIS). Research on the interoperability between BIM and GIS requires knowledge of Open BIM as well as Open GIS and their interconnection. Unfortunately, Open BIM and Open GIS have been developed separately and they have pursued different standards and technologies. Open BIM for civil infrastructure projects is still limited, especially due to the fact that the IFC open standard currently targets the building sector. Open GIS mainly relies on the use of GML/CityGML standard. This paper focuses on research to develop a solution for the interoperability of BIM and GIS, especially for the purpose of low-disturbance construction. It reports the on-going EU FP7 collaborative research project PANTURA. The preliminary achievements include a prototype solution that consists of: an architecture for the integration solution between BIM and GIS data and tools - an Application Domain Extension (ADE) that connects BIM data from the bridge with the computational parameters on disturbance in a GIS-based planning tool Urban Strategy, a configuration of open-source Deegree 3D model server, and a query interface between the model server and the decision-support tool. The prototype solution is verified using two case studies: on-site assembly of a new bridge on La Palma island, Spain, and refurbishment of existing bridges in Rotterdam, the Netherlands.

Keywords: BIM,GIS,interoperability,decision-support tool,low-disturbance construction,bridge project,urban environment

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Full text: content.pdf (1,249,553 bytes) (available to registered users only)

Series: convr:2013 (browse)
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