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Andrej Tibaut, Branko Kau?i?, Peter Podbreznik, Marjan Lep, Dušan Zalar

Towards intelligent information system for public interurban road passenger transport management

Abstract: Public road transport forms a complex and dynamical domain that encompasses fields of traffic, business and politics. Management of the system poses a challenge for governmental entities which are responsible for coordi-nation, control and data gathering from private transport companies. A need for IT support is obvious. The paper systematically describes a distributed enterprise information system named AVRIS developed for the Direc-torate of the Republic of Slovenia for Roads. AVRIS adds new value to the management and coordination of the domain for public interurban bus transport. First a theoretical work flow model, consisting of processes, phases and states is defined. Built upon the model a multi-tiered IS architecture is developed which incorporates a number of advanced IT concepts, like application server, shared communication space, MVC, etc. The concepts are implemented using latest open source Java technologies. First real experiences with AVRIS are evaluated and presented in the paper.

Keywords: traffic engineering, public passenger transport management, traffic informatics, decision support, shared space, work flow, open source, Java

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Full text: content.pdf (781,550 bytes) (available to registered users only)

Series: w78:2007 (browse)
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Arnaud Doniec, Stéphane Espié, René Mandiau, Sylvain Piechowiak

Traffic Simulation At Junction : Non-Normative Practices Vs. Deadlock

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Full text: content.pdf (826,606 bytes) (available to registered users only)

Series: w78:2006 (browse)
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Delic D

Design of structural elements by use of expert networks

Abstract: Shown are three nets. As the first, shown is an example of evaluating a classic rule based expert system to an expert network by replacing one of its knowledge base searching module with a neural network. The second net is used to describe a behavior model of compound steekoncrete columns. Following the design procedure of the DIN 18800 part two, and using just a selected part of data tables for columns design presented as the input data for neural network , the author succeed to organize the design process by neural network only. The rules in the expert system are used for design flow controlling. The third net is not an expert network. It is a neural network combined with PASCAL codes, but should be embedded into an expert system. The work is dealing with problems of variably Input energy control into structural systems (smart bridges) depending on the monitored generated incoming (traffic) loading.

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Series: ecce:1997 (browse)
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Espié S., Auberlet J.M.

Joint Use Of Driving Simulation And Traffic Simulation For The Study Of Road Infrastructures And Equipments

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Full text: content.pdf (732,813 bytes) (available to registered users only)

Series: w78:2006 (browse)
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Jakob Beetz, Leon van Berlo, Ruben de Laat, Pim van den Helm

BIMSERVER.Org – An Open Source IFC Model Server

Abstract: In this paper we introduce the ongoing development of a free and open model server to persist, maintain and manage instance models of the Industry Foundation Classes (IFC) format. By using open standards, robust existing software frameworks, best practices and workflows accepted in the broader software engineering world as the basis of our framework, we hope to gain traction within the research and development community by creating a completely open reference implementation that is free to use and extend within individual research projects and commercial applications. By providing an open and extendable architecture around a robust and performant kernel we hope to be able to encourage the integration of many earlier and current efforts that have been undertaken in the field of IFC-based model processing.We describe the set of features implemented so far and give an outline of a roadmap for future developments. Some of these implemented features include: User management, up- and downloads of models, a check-out and check-in mechanism and versioning. As part of this versioning mechanism we show a tree comparison algorithm that allows the creation of version-deltas we refer to as change sets. These change sets are used to minimize the amount of traffic to and from the central repository by only communicating its differences. All server-side functionality described here is exposed through a web-service API which has been used to implement web-based and standalone client applications. A filtering mechanism allows the extraction of sub-models such as specific element types. We show how we transform original STEP part 11 EXPRESS schemas into a Meta-Object-Facility (MOF), and store them in XMI/EMF models. Furthermore, we describe how our framework provides a mapping to a BerkeleyDB database facilitating its rich set of features. We demonstrate how we use a suite of more than 1600 IFC models from various sources to test the integrity of the framework. To demonstrate that our framework works efficiently enough for real-world building model scenarios, we provide some performance indicators using this extensive suite of test models.We finish our report by laying out some of the ideas and plans for the future development of the server which include query languages (for the definition of IDMs etc.), a viewer (e.g. for the visualization of differences between model versions) and the integration of other model schemas such as the ISO 12006-3.

Keywords: IFC, model server, BIM, CAD, collaboration

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Full text: content.pdf (337,242 bytes) (available to registered users only)

Series: w78:2010 (browse)
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Jiwen Zhang, Tim Taylor, Roy Sturgill, Gabe Dadi and Nikiforos Stamatiadis

Predictive Risk Modeling of Differential Bridge Settlement

Abstract: Differential settlement between the roadway pavement resting on embankment fill and the bridge abutment built on more rigid foundation often creates a bump when driving from roadway to bridge, and vice versa. This paper studies the problem at a macroscopic level by determining a method to predict the levels of approach settlement to assist designers in developing remediation plans during project development to minimize the lifecycle costs of bridge bump repairs. A macro method considering a combination of maintenance times, maintenance measures, and observed settlement was used to classify the differential settlement scale as minimal, moderate, and severe. A set of project characteristics including approach, abutment type, embankment, foundation, and traffic volume that may influence the formation of differential settlement were identified and used as parameters to develop a model to predict the settlement severity for a given approach. Logistic regression analyses were implemented to identify the relationships between the levels of differential settlement and the input variables for a sample of 600 randomly selected bridges in Kentucky. Geographic region, approach age, average daily traffic, and the use of approach slabs are identified as the four most predominant factors that can significantly affect the formation of differential settlement. Based on the performance of bridge approaches in Kentucky, how those parameters interacted in the prediction model is illustrated in the logistic regressions.

Keywords: Differential Settlement, Logistic Regression, Prediction Model

DOI: https://doi.org/10.24928/JC3-2017/0060

Full text: content.pdf (338,728 bytes) (available to registered users only)

Series: jc3:2017 (browse)
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Lee C-H,Tsai M-H,Kang S-C

Vao checker: accessibility study for pipeline maintenance

Abstract: Pipeline maintenance is becoming an important issue in modern construction. An understanding of accessibility considerations in terms of operation and maintenance is essential for pipeline planning and management. Previous studies have highlighted the complexity of multi-pipes and the importance of visualization, but few have proposed a way to consider accessibility problems during operation and maintenance. Therefore, this study develops a systematic method to evaluate accessibility with respect to pipeline maintenance. We first divided pipeline accessibility into three categories: (1) visual accessibility—a pipeline visible to the inspectors, (2) approachable accessibility—a pipeline that is reachable, and (3) operational accessibility—a pipeline that can be operated by the inspectors. Therefore, we visually represent the intersection and union of these three levels to illustrate the varying accessibility of pipe elements. We then developed a user interface tool, VAO Checker, in which V, A and O stand for visual, approachable and operational, to display visual information about pipeline accessibility. Through instantaneous analysis, the system visualizes the accessibility of the pipelines. A usability consultation with experts will be conducted to validate the system’s effectiveness. The results of the usability analysis show pipeline designers can benefit by using this tool to sketch a suitable traffic flow for engineers to investigate. Furthermore, the substantial amount of information saved in the layout database could be referenced for future optimization.

Keywords: Building Information Model (BIM),Mechanical, Electrical, and Plumbing (MEP),Pipeline Maintenance,Pipeline Accessibility,Information Visualization

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Series: convr:2013 (browse)
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M-W Park, E Palinginis, I Brilakis, J Laval, M Hunter, R Guensler

Unsupervised Framework for Traffic Counting: Speed Estimation Based on Camera Network Data

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Full text: content.pdf (192,119 bytes) (available to registered users only)

Series: w78:2014 (browse)
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Mayrai Gindy and Hani H. Nassif

Comparison Of Traffic Load Models Based On Simulation And Measured Data

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Full text: content.pdf (981,071 bytes) (available to registered users only)

Series: w78:2006 (browse)
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Mohamad Kassem and Jennifer Li

Big Data Applications in Built Environment: Towards a Use Foundation Model

Abstract: The term Ôbig dataÕ is increasingly permeating the current debate over the present and the future of our built environment. There are heightened expectations about the role big data may or can play in enabling new applications and decisions across the whole lifecycle of assets, from early design phase through construction to operation and end-of-life. It is therefore necessary to analyse the state-of-the-art in big data applications in built environment. This paper presents a structured and systematic literature review on this emerging theme. The results are quantitatively analysed using network and clustering techniques. The research identified distinct clusters within two lenses: (1) the project lifecycle (i.e., design/planning, construction, and operation), and (2) the built environment hierarchy scale (i.e., component/product, building/facility, site, neighbourhood, region and city). Six clusters of big data applications across the two lenses were identified: energy management, traffic management, design & planning, onsite construction activities, city-wide services, and smart cities.The clusters show the level of research intensity around each of their nodes and the connections between the nodes which indicate the emergence of new avenues of investigations. These results represent the first steps towards developing a descriptive ÔUse Foundation model' for big data applications in built environment.

Keywords: Built Environment, Big Data, Internet of Things, Smart Data

DOI: https://doi.org/10.24928/JC3-2017/0220

Full text: content.pdf (1,317,346 bytes) (available to registered users only)

Series: jc3:2017 (browse)
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