Ali Motamedi

École de Technologie Supérieure · Département de génie de la construction

Diminished reality (DR) is a set of techniques for visually removing unwanted objects within an environment in real time. This study attempts to carry out a systematic literature review to investigate the potential benefits, challenges, and efficacy of DR in various applications. To investigate the relevant studies, a classification framework with...

Accurate mapping of the built asset information to established data classification systems and taxonomies is crucial for effective asset management, whether for compliance at project handover or ad-hoc data integration scenarios. Due to the complex nature of built asset data, which predominantly comprises technical text elements, this process remai...

The digital transformation of the construction sector is leading to a wider adoption of project digitization, process automation, and new project methodologies, demonstrating numerous benefits for sector productivity. This growth is pushing the sector more than ever into the era of digitalization, along with the issues that come with it. Managing t...

Optimizing building energy consumption based on occupancy information is a crucial approach for improving energy management in buildings. Various studies have proposed different solutions for estimating occupant count. However, high costs and privacy concerns are still significant barriers that limit the practice of occupant count estimation. To ad...

In today's fast-evolving technological landscape, digital twins are emerging for understanding and managing complex systems and to assist stakeholders in the process of informed decision-making. Despite the growing importance of this technology, there exists a noticeable gap in the literature, with limited attention devoted to crafting effective vi...

More than a simple 3D modelling tool, BIM is a set of interacting policies, processes and technologies generating a methodology to manage the essential building design and project data in digital format throughout the building's life cycle. This new way of working also includes a new paradigm in construction projects, breaking down traditional proj...

Construction and demolition waste (C&DW) materials are highly valuable as, in most cases, they can be reused. In other cases, such material can be highly pollutant. Therefore, their traceability becomes very important in the frame of sustainable development. Computer vision-based solutions have the potential to recognize different forms of construc...

Livro de atas do Congresso ptBIM 2024, onde se promove a discussão técnico-científica em língua Portuguesa da metodologia ‘Building Information Modelling’ (BIM), envolvendo a participação ativa das comunidades profissional e académica das áreas de Arquitetura, Engenharia e Construção. Pretende-se enfatizar os problemas e esforços de implementação B...

Facility Management (FM) is an essential practice for the operational phase of built assets. FM requires a vast range of data arising from diverse activities, which demands tools and processes for data collection and management. The Building Information Modeling (BIM) methodology implies an integrated information management process which helps in e...

Traditional methods of supervision in the construction industry are time-consuming and costly, requiring significant investments in skilled labor. However, with advancements in artificial intelligence, computer vision, and deep learning, these methods can now be automated, resulting in time and cost savings, as well as improvements in product quali...

While the adoption of open Building Information Modeling (open BIM) standards continues to grow, the inherent complexity and multifaceted nature of the built asset lifecycle data present a critical bottleneck for effective information retrieval. To address this challenge, the research community has started to investigate advanced natural language-b...

Point cloud-based deep neural networks (PC-DNNs) has seen growing interest in the construction domain due to their remarkable ability to enhance Building Information Modeling (BIM)-related tasks. Among these tasks, Industry Foundation Classes (IFC) object classification using PC-DNNs has become an active research topic. This focus aims to mitigate...

As indicated by various researches, the most important benefits of BIM will be for the management of the building assets. Inefficiencies in current data collection and management processes have a significant economic impact, as O&M activities represent a particularly large portion of lifecycle costs. The current practice of manual data collection a...

Within the overarching theme of “Managing the Digital Transformation of Construction Industry” the 23rd International Conference on Construction Applications of Virtual Reality (CONVR 2023) presented 123 high-quality contributions on the topics of: Virtual and Augmented Reality (VR/AR), Building Information Modeling (BIM), Simulation and Automation...

Quality assurance (QA) and quality control (QC) are two central and concurrent processes for data quality management. Together, they enable construction project participants to ensure high quality output by meeting client requirements and complying with a range of building regulations. QA is a proactive process used iteratively from the beginning o...

The advances in image capture technology have made it easier and more affordable to collect images and videos. Thus, most construction site are now equipped with surveillance cameras that continuously capture visual data which contain valuable information that can be used to assess the four main on-site construction processes: safety monitoring, pr...

The proven power of Knowledge Graphs (KGs) to effectively represent lexical and semantic information about numerous and heterogeneous entities and their interconnectedness has led to the growing recognition of their potential in engineering disciplines. Meanwhile, a greater focus has been placed on graph embedding techniques to derive dense vector...

The concept of Digital Twin (DT) has been receiving an increasing amount of attention in the construction management and building engineering research domains. Although the benefits of DT are evident, confusion with regards to the concept of DTs and its relationship with others such as Cyber-Physical Systems (CPS), Building Information Modelling (B...

ISO19650 has been developed to standardize the organization and digitization of information in the construction industry. It is used primarily to guide the implementation of building information modeling (BIM) and proposes an adaptation of traditional work processes towards more collaborative approaches across the entire lifecycle of built assets....

Despite the potentially significant benefits that Building Information Modeling (BIM) can offer during a facility's operation and maintenance (O&M) phase, the construction industry has thus far mainly implemented BIM in the design and construction phases. This is because even though as-built BIM models are delivered at the handover stage, owners an...

In the lifecycle of a building, the longest phase is generally that of operation and maintenance (O&M). The data needed to support O&M is mainly generated during the design, construction, and commissioning of the built asset phases. However, the extraction and transfer of relevant O&M data from the project documents remain a major issue in that it...

Le secteur de la construction a connu de nombreuses évolutions techniques et réglementaires au cours des 30 dernières années. Soucieux de l'impact de leurs projets sur l'environnement et la sécurité de leurs partenaires, les maîtres d'ouvrage sont de plus en plus exigeants pour la réalisation de leurs projets. À l'inverse, les acteurs de la constru...

Recent research has shown the potential of combining Building Information Modeling (BIM) and Internet of Things (IoT) to produce accurate digital twins of buildings. Such digital twins rendered within 3D visualization environments can enable highly intuitive experiences of human-building interactions. Moreover, machine learning techniques can be ap...

ISO19650 has been developed to standardize the organization and digitization of information in the construction industry. It is used primarily to guide the implementation of building information modeling (BIM) and proposes an adaptation of traditional work processes towards more collaborative approaches across the entire lifecycle of built assets....

Several recent studies have observed that the most important benefits of BIM are for the operation and management of building assets. Current inefficiencies in data collection and management processes are having a significant economic impact on facility management, as O&M activities represent a large portion of life cycle costs. Current industry to...

Despite their vast potential for delivering rich and intuitive visualizations of live building monitoring data, digital twins have been rarely studied in the context of thermal comfort. To narrow this gap, this study investigates the synergistic benefits of Building Information Modeling (BIM), the Internet of Things (IoT) and Virtual Reality (VR) f...

Since the invention of computers, various research communities have been investigating computing systems that can naturally interact with the environment and humans. To achieve this vision, many significant research attempts have been made to enable computers to mimic the way human beings think, reason, and shape their behavior. Within the last few...

Building Information Modeling (BIM) and Internet of Things (IoT) are two emergent technologies that promise substantial improvements in the lifecycle management of facilities. Recently, research on BIM-centered IoT applications has been gaining an increasing momentum. Currently, there exist some major challenges that impede the realization of the s...

L’intégration de la modélisation des données du bâtiment (BIM) dans l’industrie de la construction a pour effet d’introduire des changements importants dans les processus de design et de construction. Bien que communément utilisé en contexte de design et de construction des actifs, le BIM utilisé au profit de l’opération des actifs n’est pas encore...

In the construction industry, there is often a need to identify and localize assets and activities on the jobsite to assess and improve the performance of their associated processes. Traditional methods for monitoring construction activities are costly and time-consuming. Excavators and dump trucks are among the most common assets used in the const...

BIM-assisted project execution methods are being increasingly adopted by designers and contractors due to client demand and the efficiency gains they provide. However, many owner organizations do not take full advantage of BIM in assessing the quality of deliverables, and do not use digital deliverables during the operation phase. Additionally, alt...

Building Information Modeling (BIM) is being widely used during the design and construction of buildings. Recently, the use of BIM technology during the operation and maintenance phase has been increasingly adopted. Additionally, Virtual Reality (VR) and Augmented Reality (AR) technologies are utilized in many applications during the design, constr...

Thanks to the digital representations provided through Building Information Modeling (BIM), successful adoption of emerging digital technologies have been increasingly reported within the constriction and facility management research community. On the other hand, the number of research studies exploiting the principles of the Internet of Things (Io...

This paper proposes a method for an automated live sensor data visualization of building indoor environment conditions using a VR system. The proposed method is based on the integration of environmental sensors, BIM, and VR technology. Such integration provides an opportunity to utilize an immersive and live sensing technology for improving data vi...

Purpose Given the ongoing digital transformation, building information modeling (BIM) has great potential to create a collaborative environment in the whole lifecycle of the built asset, from inception to decommissioning. The paper aims to discuss this issue. Design/methodology/approach This paper relates current developments in Québec with rega...

Construction Information Modeling (CIM), is a new approach to model all the information related to Civil Infrastructure Systems (CIS) by integrating this information with 3D models representing the geometrical and spatial characteristics of these systems. The main usage of CIM at the time being is limited to the design phase and some aspects of the...

BIM is designed to be used during the whole lifecycle of a facility. It has great potential to be used by owners and facilities managers to improve various processes during the Operation and Maintenance phase (O&M). However, its use during the operation phase remains significantly limited. One of the main barriers to the adoption of BIM for Facilit...

The renovation projects of buildings and living spaces, which aim to improve the thermal environment, are gaining importance because of energy saving effects and occupants' health considerations. However, the indoor thermal design is not usually performed in a very efficient manner by stakeholders, due to the limitations of a sequential waterfall d...

This paper proposes a novel method for polygonizing scanned point cloud data of tunnels to feature-preserved polygons to be used for maintenance purposes. The proposed method uses 2D cross-sections of structures and polygonizes them by a lofting operation. In order to extract valid cross-sections from the input point cloud, center lines and orthogo...

Background: Lighting simulation tools are extending the functionality of Building Information Modeling (BIM) authoring software applications to support the lighting design analysis of buildings. Although such tools enable quantitative and qualitative analysis and visualization of indoor lighting, they do not provide an interactive environment betwe...

Thermal performance of the building envelope exerts considerable influence on maintaining indoor environmental conditions. Acquisition of sensor data of a building is essential to ensure the improvement of the indoor thermal environment for the occupants. The environmental sensor technologies together with Building Information Modeling (BIM) are to...

The lack of adequate data containers and data collection procedures prevents Building Information Modeling (BIM) from being efficiently used for the thermal comfort analysis. The paper presents a framework for integrating environmental data with the BIM for the purpose of thermal comfort analysis. The environmental data, such as indoor/outdoor air...

Computational visual simulations are extremely useful and powerful tools for decision-making. The use of virtual and augmented reality (VR/AR) has become a common phenomenon due to real-time and interactive visual simulation tools in architectural and urban design studies and presentations. In this study, a demonstration is performed to integrate s...

The green building design movement has gained major importance in the field of architecture. Meanwhile, with the development of Building Information Modeling (BIM) technology, a more integrated and interactive approach for building design, construction, and operation is emerging. In this research, a BIM-based approach to automate the design assessm...

Building Information Modeling (BIM) has emerged as object-oriented, standard, and shared data repositories to host lifecycle data of facilities. Information about defects and degradations of facilities elements that are gathered through inspection activities during the operation phase are essential for assessing the structural health and planning f...

The renovation projects to improve the thermal environment are gaining importance because of energy saving effects and occupants' health considerations. However, the indoor thermal design is not usually performed in a very efficient manner by owners and designers because the architectural design data including the indoor thermal design is not centr...

In this study, an Augmented Reality (AR) system is developed to be used for visualizing design projects of buildings. In such design projects, it is desirable to enable design stakeholders visualizing the outcomes of different design options to reduce the resistance and hesitation towards new design challenges. The research proposes an outdoor mark...

The proper placement of signage greatly influences pathfinding and information provision in public spaces. Clear visibility, easy comprehension, and efficient placement are all important for successful signage. We propose a signage visibility analysis and optimization system, utilizing an updated Building Information Model (BIM) and a game engine s...

This paper proposes a novel method for polygonizing swept structures from scanned point cloud data. The proposed method uses 2D profile curves of structures and polygonizes them by a lofting operation. In order to extract profile curves from the input point cloud, center lines of the point cloud are extracted using local symmetry analysis and a set...

Recently, Augmented Reality (AR), which extends a visible scene with virtual objects, has gained popularity for landscape assessment. It is used in urban planning to facilitate reaching consensus on a design. However, existing AR approaches cannot correctly simulate views after the demolition and removal of outdoor buildings. Tanemura et al. (2014)...

It is important to identify noise sources to solve noise pollution problems. However, due to the properties of sound, such as invisibility, diffraction, and interference, it is often difficult to identify the location of noise sources by human ears. Some researchers have already developed systems for detecting and visualizing the location of the so...

The quality of lighting has been considered as one of the key parameters for improving human comfort. Recent advances in lighting simulation tools allow users to use Building Information Modeling (BIM) plug-ins for the lighting analysis. Although such tools enable analyzing and visualizing indoor lighting factors quantitatively and qualitatively, t...

In the field of architecture, Integrated Project Delivery (IPD) has been promoted to improve the quality of the architectural design. IPD is a concept for optimizing architectural design process in which stakeholders of a project, such as owners, architects and designers cooperate and make decisions. Building Information Modeling (BIM) is used as a...

With the development of Information Technologies (IT), a need for new methods to visualize digital information has appeared in architectural and urban field. Augmented Reality (AR) technology, that overlays computer graphics on real world scenes, can be used to satisfy the need. AR-systems can use a wide variety of displays with different character...

The proper placement of directional signage greatly influences the path finding in public spaces. Therefore, the clear visibility and the efficient placement of signs need to be ensured. Building Information Modelling (BIM) can provide an up-to-date digital representation of the building and its assets. Additionally, computer simulation environment...

This paper presents a novel technique for enhancing the polygonization of point cloud data by using geometric similarity. Our method is an extension of our previous work, which uses local shape matching and aligns polygons with similar shapes into a point cloud by using the Iterative Closest Point (ICP) algorithm. In this paper, we propose to input...

This paper focuses on the performance of the building envelope of existing buildings by creating 4D models of thermal data to identify areas that require modifications. The proposed method is based on the integration of a digitally captured thermal data of the building envelope and sensors' data inside the building with the BIM model. For that, the...

Greening has been promoted to improve the living conditions in urban environments. Quantification of greenery is an important issue to identify the criteria for stakeholders in the process of greening. This research focuses on the quantification of visible green-ery ratio which is defined as the amount of greenery in the field of vision. Some measu...

In the context of environmental consideration and improvement of living standards, design of high performance buildings that are both comfortable and energy saving is important. Simulation tools (such as CFD) enables analysing and visualizing environmental factors (such as temperature and airflow) based on the design properties and can be used to i...

In this study, Augmented Reality (AR) system is proposed to be used for outdoor renovation and maintenance projects of buildings. The research proposes an outdoor marker-less AR system that considers the mobility of users and their long relative distance to target buildings where 3D virtual objects should be augmented on. The proposed system uses l...

Building Information Modeling (BIM) is emerging as a method of creating, sharing, exchanging and managing the building information throughout the lifecycle between all stakeholders. Radio Frequency Identification (RFID), on the other hand, has emerged as an automatic data collection and information storage technology, and has been used in different...

This research proposes a method of polygonization by using point cloud of rail of monorail. It is not easy to polygonization of monorail due to its long and large structure. Especially, rails are difficult to scan by laser scanner because they are placed in very high. Therefore, it is not expected to efficiently polygonize of rail for maintenance....

Way-finding is one of main challenges for pedestrians in large subterranean spaces with complex network of connected labyrinths. This problem is caused by the loss of their sense of directions and orientation due to the lack of landmarks that are occluded by ceilings, walls, and skyscraper. This paper introduces an assistance system for way-finding...

The existing civil structures must be maintained in order to ensure their expected lifelong serviceability. Careful rehabilitation and maintenance planning plays a significant role in that effort. Recently, construction information modelling (CIM) techniques, such as product models, are increasingly being used to facilitate structure maintenance. U...

Facilities managers need to identify failure cause–effect patterns in order to prepare corrective and preventive maintenance plans. This task is difficult because of the complex interaction and interdependencies between different building components. Standardization based on Building Information Modeling (BIM) provides new opportunities to improve...

Crime prevention is an important issue because the fear of crime significantly influences on our Quality of Life (QOL). Crime Prevention Through Environmental Design (CPTED), which is one of the crime prevention methods, is considered to be an effective method for preventing opportunity crime occurring especially in urban areas. We considered that...

Indoor localization has gained importance as it has the potential to improve various processes related to the lifecycle management of facilities and to deliver personalized and location-based services (LBSs). Radio Frequency Identification (RFID) based systems, on the other hand, have been widely used in different applications in construction and m...

Indoor/outdoor localization has gained importance as it has the potential to improve various processes related to the resource management of construction projects and to deliver personalized and location-based services (LBS). Radio Frequency Identification (RFID) based systems, have been widely used in different applications in construction and mai...

Building Information Modelling (BIM) is emerging as a method of creating, sharing, exchanging and managing the building information throughout the lifecycle between all stakeholders. Radio Frequency Identification (RFID), on the other hand, has emerged as an automatic data collection and information storage technology, and has been used in differen...

The present research aims to enhance the safety by analysing spatio-temporal problems onsite in real time using BIM and RTLS. The physical barriers/barricades are checked automatically to ensure that safety measures are installed at the proper locations with proper dimensions according to the regulations. Workers are protected by virtually fencing...

Radio Frequency Identification (RFID) based systems have been used in different applications in the Architecture, Engineering, Construction, Owner and Operator (AECOO) industry. Applications are mainly designed for specific lifecycle stage of the facility and serve the needs of only one of the stakeholders. This would increase the cost and the labo...

Availability of accurate location information of components decreases the search time and increases the chance of using shared resources. In our previously proposed framework, RFID tags are attached to components at an early stage of the lifecycle and their memory is used for various purposes throughout the lifecycle. In this paper, we propose to s...

The AECOO industry is highly fragmented; therefore, efficient information sharing and exchange between various players are evidently needed. Furthermore, the information about facility components should be managed throughout the lifecycle and be easily accessible for all players in the AECOO industry. BIM is emerging as a method of creating, sharin...