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Dr. Jun Ahn
University of South Australia, UniSA STEM, SA, 5000, Australia

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0 Construction Safety
0 Ergonomics
0 Human Factors
0 Automation in construction
0 Human–Machine Interaction

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Journal article
Published: 01 July 2021 in Journal of Management in Engineering
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This paper analyzed 19 precast concrete (PC) construction project cases from Korea using fuzzy-set qualitative comparative analysis to explore the relationship between the conditions of PC projects, observable at an early stage of the projects, and actual schedule delays. The following combinations of PC project conditions leading to schedule delays were identified: (1) the use of multiple types of PC components and nonuse of building information modeling (BIM) for schedule management; (2) PC construction included in the critical path, insufficient experience of the contractor in PC projects, and nonuse of BIM for schedule management; and (3) nonresidential building project, insufficient experience of the contractor in PC projects, and non-use of BIM for schedule management. To understand these findings more deeply, this research further investigated the relationships of the use of BIM with other schedule delay factors based on focus groups. The PC project schedule delay leading indicators identified in this research can help construction managers to mitigate schedule delay risks at an early stage in PC projects.

ACS Style

Kyeongwoon Cho; Seungjun Ahn; Kyungmo Park; Tae Wan Kim. Schedule Delay Leading Indicators in Precast Concrete Construction Projects: Qualitative Comparative Analysis of Korean Cases. Journal of Management in Engineering 2021, 37, 04021024 .

AMA Style

Kyeongwoon Cho, Seungjun Ahn, Kyungmo Park, Tae Wan Kim. Schedule Delay Leading Indicators in Precast Concrete Construction Projects: Qualitative Comparative Analysis of Korean Cases. Journal of Management in Engineering. 2021; 37 (4):04021024.

Chicago/Turabian Style

Kyeongwoon Cho; Seungjun Ahn; Kyungmo Park; Tae Wan Kim. 2021. "Schedule Delay Leading Indicators in Precast Concrete Construction Projects: Qualitative Comparative Analysis of Korean Cases." Journal of Management in Engineering 37, no. 4: 04021024.

Journal article
Published: 01 July 2021 in Journal of Management in Engineering
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The use of mobile devices in construction projects has increasingly become common in many countries. Although researchers have investigated how mobile devices can help construction management professionals, previous research has primarily focused on the functionalities of the devices and overlooked how mobile devices are actually used and appropriated by construction management professionals in workplaces. Especially, how mobile devices, construction management professionals, and construction organizations interact and influence one another over time is understudied. To address this knowledge gap, this paper aims to describe the intertwined, dynamic relationships among mobile devices, construction management professionals, and the organizational attributes of construction companies and projects, based on 27 semistructured interviews from the Australian construction industry. In the interpretive analysis of the data, the structuration model of technology is used as the theoretical framework. The research shows how organization–project–user–technology interactions continually shape the use of mobile devices and its consequences in construction projects. The findings offer useful insights into how the use of mobile devices by construction management professionals can result in both intended and unintended consequences and also help identify the issues to be addressed for the successful implementation of these technologies in construction projects.

ACS Style

Abid Hasan; Seungjun Ahn; Bassam Baroudi; Raufdeen Rameezdeen. Structuration Model of Construction Management Professionals’ Use of Mobile Devices. Journal of Management in Engineering 2021, 37, 04021026 .

AMA Style

Abid Hasan, Seungjun Ahn, Bassam Baroudi, Raufdeen Rameezdeen. Structuration Model of Construction Management Professionals’ Use of Mobile Devices. Journal of Management in Engineering. 2021; 37 (4):04021026.

Chicago/Turabian Style

Abid Hasan; Seungjun Ahn; Bassam Baroudi; Raufdeen Rameezdeen. 2021. "Structuration Model of Construction Management Professionals’ Use of Mobile Devices." Journal of Management in Engineering 37, no. 4: 04021026.

Journal article
Published: 06 November 2020 in Journal of Computational Design and Engineering
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Although offsite construction (OSC) has emerged as a promising solution to low productivity issues in the construction industry, knowledge for effective management of OSC projects is yet to be explored and developed further. To enhance our understanding of the landscape of the current OSC management knowledge, this study identified and reviewed 83 operation-level OSC management papers. By mapping the papers on three dimensions (i.e. OSC project type, project phase, and management area), this review sheds light on the knowledge areas addressed more frequently than the other areas over time in a detailed manner. The review also shows that papers on planning, manufacturing, maintenance phases and schedule, resources, and stakeholder management areas have a relatively large number of citations, implying a great interest in these research areas. Finally, the review discusses that substantial research work is still required in the areas of OSC execution strategy, emerging technologies in offsite manufacturing and schedule management, internet of things (IoT)-based material logistics planning and tracking, building information model-based visualization and decision support, and social and environmental effects of stakeholder engagement in OSC projects.

ACS Style

Junyoung Jang; Seungjun Ahn; Seung Hyun Cha; Kyeongwoon Cho; Choongwan Koo; Tae Wan Kim. Toward productivity in future construction: mapping knowledge and finding insights for achieving successful offsite construction projects. Journal of Computational Design and Engineering 2020, 8, 1 -14.

AMA Style

Junyoung Jang, Seungjun Ahn, Seung Hyun Cha, Kyeongwoon Cho, Choongwan Koo, Tae Wan Kim. Toward productivity in future construction: mapping knowledge and finding insights for achieving successful offsite construction projects. Journal of Computational Design and Engineering. 2020; 8 (1):1-14.

Chicago/Turabian Style

Junyoung Jang; Seungjun Ahn; Seung Hyun Cha; Kyeongwoon Cho; Choongwan Koo; Tae Wan Kim. 2020. "Toward productivity in future construction: mapping knowledge and finding insights for achieving successful offsite construction projects." Journal of Computational Design and Engineering 8, no. 1: 1-14.

Journal article
Published: 01 September 2020 in Journal of Construction Engineering and Management
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Many researchers, as well as industry practitioners, believe that offsite construction methods are associated with a lower level of worker safety risks than traditional onsite construction methods. This study aims to test such belief by comparing the list of worker safety risks identified by site supervisors for both onsite and offsite construction scenarios for the same building components. Specifically, Safe Work Method Statements (SWMS)—prejob hazard assessments required by law in Australia—were collected from two projects where offsite manufacturing has been used, and they were used as a basis for the investigation. Additionally, interviews were conducted with the site supervisors who developed the Statements for a more in-depth investigation of the worker safety risks involved with onsite and offsite construction methods, respectively. The analysis reveals that the total risk score (the higher the score, the more numerous the safety risks) would decrease in the offsite construction scenarios in each case, mainly due to significantly fewer work-at-height tasks included in the offsite construction scenarios. This study contributes to the body of knowledge by providing an empirical, evidence-based explanation for why offsite construction can help reduce safety risks on construction sites.

ACS Style

Seungjun Ahn; Luke Crouch; Tae Wan Kim; Raufdeen Rameezdeen. Comparison of Worker Safety Risks between Onsite and Offsite Construction Methods: A Site Management Perspective. Journal of Construction Engineering and Management 2020, 146, 05020010 .

AMA Style

Seungjun Ahn, Luke Crouch, Tae Wan Kim, Raufdeen Rameezdeen. Comparison of Worker Safety Risks between Onsite and Offsite Construction Methods: A Site Management Perspective. Journal of Construction Engineering and Management. 2020; 146 (9):05020010.

Chicago/Turabian Style

Seungjun Ahn; Luke Crouch; Tae Wan Kim; Raufdeen Rameezdeen. 2020. "Comparison of Worker Safety Risks between Onsite and Offsite Construction Methods: A Site Management Perspective." Journal of Construction Engineering and Management 146, no. 9: 05020010.

Journal article
Published: 26 August 2020 in Applied Sciences
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Three-dimensional (3D) visualization technology, such as augmented reality (AR), has served as the display for building information modeling (BIM)-based architectural design collaboration to provide more effective design observation and communication for stakeholders. That said, AR has several technical limitations in terms of personal device issues, user experience, and visualization quality. A new form of AR called spatial augmented reality (SAR) has been introduced to address these issues, which uses a digital projector to present graphics on physical objects for augmenting real-world objects. Therefore, SAR has great benefits and potentials to combine with BIM for design collaboration. This paper introduces a BIM-based SAR operational framework, where 3D building models generated from BIM software are imported to projection mapping tools to display building surface textures on physical white building models. A case study using Revit and 3ds Max as the BIM software, and MadMapper as the projection mapping tool, was conducted to demonstrate the feasibility of the proposed framework and to evaluate the projection performance of SAR. The case study showed that the texture of BIM models could be projected on the objects clearly and realistically. Additionally, the proposed SAR method potentially offers intuitive observation of building models and comfortable wear-free experience for collaborative design, and the qualitative analysis by changing the parameters was conducted to test the different projection conditions. Since it is expected that the use of SAR can be promoted by overcoming the discussed technical limitations and possible solution application, this study aims to traceability provide the whole process of BIM-based SAR for architectural design collaboration.

ACS Style

Yixuan Jin; Joonoh Seo; Jin Gang Lee; Seungjun Ahn; Sanguk Han. BIM-Based Spatial Augmented Reality (SAR) for Architectural Design Collaboration: A Proof of Concept. Applied Sciences 2020, 10, 5915 .

AMA Style

Yixuan Jin, Joonoh Seo, Jin Gang Lee, Seungjun Ahn, Sanguk Han. BIM-Based Spatial Augmented Reality (SAR) for Architectural Design Collaboration: A Proof of Concept. Applied Sciences. 2020; 10 (17):5915.

Chicago/Turabian Style

Yixuan Jin; Joonoh Seo; Jin Gang Lee; Seungjun Ahn; Sanguk Han. 2020. "BIM-Based Spatial Augmented Reality (SAR) for Architectural Design Collaboration: A Proof of Concept." Applied Sciences 10, no. 17: 5915.

Journal article
Published: 01 July 2020 in Journal of Construction Engineering and Management
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Many construction accidents are caused by workers’ unsafe behavior, and evidence suggests that individuals who are not sensitive to risks are accident-prone. Therefore, identifying workers with certain personal characteristics related to habitual insensitive response to safety risks potentially can help construction managers develop individualized safety training and interventions. Although the methods by which construction managers could identify those workers with specific personal characteristics have been limited, wearable sensors provide an opportunity for construction managers to monitor individual workers’ behavior without any interruptions. This study investigated whether and how sensing data about workers’ behavior around hazards can reveal their personality traits related to risk-taking behavior. In particular, this research focused on a personality trait well known to be related to risk-taking behavior, locus of control (LOC). An experiment was designed to collect workers’ behavioral response to various hazards in terms of gait patterns; LOC was measured using standard instruments. The analysis showed that the degree of gait change around hazards is significantly correlated with LOC score. Additionally, those with internal LOC had more consistent gait patterns over a number of repetitive exposures to the same hazard (i.e., sustained sensitivity to safety risks) than those with an external LOC. These results demonstrate the potential of using wearable sensors to identify workers with personality traits associated with unsafe behavior.

ACS Style

Cenfei Sun; Seungjun Ahn; Changbum Ryan Ahn. Identifying Workers’ Safety Behavior–Related Personality by Sensing. Journal of Construction Engineering and Management 2020, 146, 04020078 .

AMA Style

Cenfei Sun, Seungjun Ahn, Changbum Ryan Ahn. Identifying Workers’ Safety Behavior–Related Personality by Sensing. Journal of Construction Engineering and Management. 2020; 146 (7):04020078.

Chicago/Turabian Style

Cenfei Sun; Seungjun Ahn; Changbum Ryan Ahn. 2020. "Identifying Workers’ Safety Behavior–Related Personality by Sensing." Journal of Construction Engineering and Management 146, no. 7: 04020078.

Journal article
Published: 01 March 2020 in Journal of Management in Engineering
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Understanding the causal relationships between safety management system (SMS) factors and accident precursors helps construction organizations identify which factors require improvement upon observing an accident precursor. Previous research has not clearly distinguished between SMS factors and accident precursors. This background examines the relationships between SMS factors and accident precursors using empirical data. Specifically, five structural equation models (SEMs) were developed to map causal paths between SMS factors and accident precursors. Each of the SEMs helps identify what specific SMS factors would have a significant influence on the occurrence of a particular type of accident precursor. These models can thus help describe what specific SMS factors would need to be improved when a certain type of accident precursor appears on site. The SEM results show in particular that the occurrence of accident precursors can be attributed largely to adverse project conditions such as project schedule pressure, reworks, and change orders. Construction organizations may capitalize on these findings by prioritizing safety management resources to address specific observed accident precursors in a more informed and targeted manner.

ACS Style

Estacio Pereira; Seungjun Ahn; Sanguk Han; Simaan Abourizk. Finding Causal Paths between Safety Management System Factors and Accident Precursors. Journal of Management in Engineering 2020, 36, 04019049 .

AMA Style

Estacio Pereira, Seungjun Ahn, Sanguk Han, Simaan Abourizk. Finding Causal Paths between Safety Management System Factors and Accident Precursors. Journal of Management in Engineering. 2020; 36 (2):04019049.

Chicago/Turabian Style

Estacio Pereira; Seungjun Ahn; Sanguk Han; Simaan Abourizk. 2020. "Finding Causal Paths between Safety Management System Factors and Accident Precursors." Journal of Management in Engineering 36, no. 2: 04019049.

Journal article
Published: 09 January 2020 in Accident Analysis & Prevention
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Forklifts are among the machines involved with the highest levels of occupational fatalities. As many accidents involved with a forklift can be attributed to the low situation awareness (SA) of the operator, it is essential to understand the factors influencing a forklift operator’s SA for reducing forklift accidents, especially of collision type. Against this background, this research aims to investigate how a forklift operator’s SA about other people around can be influenced by the type of subtasks they are carrying out. In this research, a virtual reality (VR) environment is used as the experiment environment, in which subjects perform a series of subtasks, such as driving, turning, reversing, loading and unloading, with a VR forklift simulation model. A SAGAT—an established SA measurement technique based on a series of queries targeting Level 1, 2, and 3 SA—is used as the main method to collect data about subjects’ SA in the experiment. The analysis of the data reveals that a forklift operator is likely to have a reduced SA about the workers around when he/she is performing a loading or unloading task due to attention narrowing, which occurs when a person concentrates on a cognitively demanding task. The findings provide insights into how forklift operator SA could be improved through an SA-oriented safety training program and also how sensing technologies might assist forklift operators with maintaining a good SA.

ACS Style

Minji Choi; Seungjun Ahn; Joonoh Seo. VR-Based investigation of forklift operator situation awareness for preventing collision accidents. Accident Analysis & Prevention 2020, 136, 105404 .

AMA Style

Minji Choi, Seungjun Ahn, Joonoh Seo. VR-Based investigation of forklift operator situation awareness for preventing collision accidents. Accident Analysis & Prevention. 2020; 136 ():105404.

Chicago/Turabian Style

Minji Choi; Seungjun Ahn; Joonoh Seo. 2020. "VR-Based investigation of forklift operator situation awareness for preventing collision accidents." Accident Analysis & Prevention 136, no. : 105404.

Earlycite article
Published: 20 December 2019 in Engineering, Construction and Architectural Management
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Purpose While mobile Information and Communication Technologies (mobile ICTs) have been adopted by many construction organisations, research on the usage of mobile technologies in the context of construction project management has been scarce. Against this background, the purpose of this paper is to enhance the understanding of how Construction Management Professionals (CMPs) currently use mobile ICTs at work and the factors affecting their usage of mobile ICTs in the context of the Australian construction industry. Design/methodology/approach In this research, the aim is addressed by a survey-based empirical research approach. A questionnaire was used to collect data about CMPs’ current mobile ICT usage and the factors affecting the usage. Then, relative importance index, factor analysis and χ 2 test were used to identify the most significant factors affecting their mobile ICT usage. Findings This research found that user characteristics such as age or years of experience are not the major factors affecting CMPs’ mobile ICT usage. The research also found that there are several barriers hindering an effective usage of mobile ICTs, namely work-family spillover, system quality issues, inconsistency in the way of using mobile ICTs among CMPs and the lack of organisational support. Originality/value The results of this research imply that to fully reap the potential benefits of mobile ICTs in construction projects, those barriers need to be addressed appropriately at the individual, organisational and industry levels. Also, this research informs construction organisations of how mobile ICTs can be deployed and used in the most cost-effective way in their projects.

ACS Style

Abid Hasan; Seungjun Ahn; Raufdeen Rameezdeen; Bassam Baroudi. Investigation into post-adoption usage of mobile ICTs in Australian construction projects. Engineering, Construction and Architectural Management 2019, 28, 351 -371.

AMA Style

Abid Hasan, Seungjun Ahn, Raufdeen Rameezdeen, Bassam Baroudi. Investigation into post-adoption usage of mobile ICTs in Australian construction projects. Engineering, Construction and Architectural Management. 2019; 28 (1):351-371.

Chicago/Turabian Style

Abid Hasan; Seungjun Ahn; Raufdeen Rameezdeen; Bassam Baroudi. 2019. "Investigation into post-adoption usage of mobile ICTs in Australian construction projects." Engineering, Construction and Architectural Management 28, no. 1: 351-371.

Conference paper
Published: 01 December 2019 in 2019 IEEE International Conference on Industrial Engineering and Engineering Management (IEEM)
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Adversarial multi-stakeholder engagement in international ICT projects can bring up adverse or negative situations that can be detrimental to project performance, project outcomes and project actors well-being. Prior studies do indicate the antidotes as remedial strategies or proven practices to address adversarial multi-stakeholder engagement but lack empirical research on investigating the effectiveness of the antidotes in addressing the difficulties in stakeholder engagement. This knowledge gap is addressed using a questionnaire survey involving 144 global ICT professionals. 20 antidotes were ranked using the Relative Importance Index (RII). The top highly effective antidotes are trust building, transformational leadership, single point of contact, stakeholder analysis and interaction planning. The research findings contribute to project stakeholder management practice in providing the general awareness and enablement of the project management community in proactively or reactively deploying the antidotes to avoid or alleviate difficulties during multi-stakeholder engagement.

ACS Style

Krishnan Mysore; Konstantinos Kirytopoulos; Tony Ma; Seungjun Ahn. Effective Antidotes to Address Adverse Situations During Multi-Stakeholder Engagement: The Case of International ICT Projects. 2019 IEEE International Conference on Industrial Engineering and Engineering Management (IEEM) 2019, 815 -819.

AMA Style

Krishnan Mysore, Konstantinos Kirytopoulos, Tony Ma, Seungjun Ahn. Effective Antidotes to Address Adverse Situations During Multi-Stakeholder Engagement: The Case of International ICT Projects. 2019 IEEE International Conference on Industrial Engineering and Engineering Management (IEEM). 2019; ():815-819.

Chicago/Turabian Style

Krishnan Mysore; Konstantinos Kirytopoulos; Tony Ma; Seungjun Ahn. 2019. "Effective Antidotes to Address Adverse Situations During Multi-Stakeholder Engagement: The Case of International ICT Projects." 2019 IEEE International Conference on Industrial Engineering and Engineering Management (IEEM) , no. : 815-819.

Journal article
Published: 01 November 2019 in Journal of Management in Engineering
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Although many construction organizations have recently adopted mobile information and communication technologies (ICT) such as smartphones and tablets to support project management activities, it has not been clear what drives the adoption of mobile ICT and what kinds of real benefits are provided by the use of mobile ICT in the context of construction project management. Against this background, the present study aims to empirically investigate the main consequences of the use of mobile ICT in construction project management and how the use of mobile ICT can ultimately affect construction productivity. An exploratory factor analysis based on survey data collected from 101 construction management professionals (CMPs) in Australia's construction industry identified five factors, namely, improved communication and work relationship, distraction and waste of time, better information management on-site, better management of construction defects, and improved work planning, as the most important consequences of their use of mobile ICT. An ordinal regression analysis based on the extracted factors revealed that the use of mobile ICT can influence construction productivity through improved communication and work relationship, distraction and waste of time, and better management of construction defects. In addition, this research revealed that the extent of usage of mobile ICT is related to three factors: better information management on-site, better management of construction defects, and improved work planning. These empirical results explain the benefits and risks of current mobile ICT in the context of construction project management and can also inform construction organizations regarding how to utilize mobile ICT effectively in their projects.

ACS Style

Abid Hasan; Seungjun Ahn; Raufdeen Rameezdeen; Bassam Baroudi. Empirical Study on Implications of Mobile ICT Use for Construction Project Management. Journal of Management in Engineering 2019, 35, 04019029 .

AMA Style

Abid Hasan, Seungjun Ahn, Raufdeen Rameezdeen, Bassam Baroudi. Empirical Study on Implications of Mobile ICT Use for Construction Project Management. Journal of Management in Engineering. 2019; 35 (6):04019029.

Chicago/Turabian Style

Abid Hasan; Seungjun Ahn; Raufdeen Rameezdeen; Bassam Baroudi. 2019. "Empirical Study on Implications of Mobile ICT Use for Construction Project Management." Journal of Management in Engineering 35, no. 6: 04019029.

Earlycite article
Published: 07 October 2019 in International Journal of Managing Projects in Business
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Purpose Adverse situations negatively impact project stakeholders’ engagement. Past research has sporadically investigated adverse situations affecting stakeholder engagement but lacks a thorough empirical investigation. The paper aims to discuss this issue. Design/methodology/approach A web survey was designed to address the knowledge gap of the identification of the impactful adverse situations during multi-stakeholder engagement. The research yielded 144 completed responses from multi-stakeholders engaged in globally distributed ICT projects. Findings Exploratory factor analysis revealed eight factors that underpin 26 adverse situations. The top factors, ranked in terms of importance according to their Relative Importance Index (RII) are: dysfunctional conflicts, dearth of reasoning, glitches in project governance, clash of personalities. Research limitations/implications This research reveals the factors that can impact engagement in the form of meaningful clusters and dimensions and opens-up a future research agenda toward causation and mitigation studies related to adversarial stakeholder engagement. The study focuses on globally distributed ICT projects and has not explored generalizability in other sectors. Practical implications This research enables project managers and stakeholder analysts to get an understanding on the importance of different dimensions of adverse situations in the way stakeholders think, act and emote. Social implications Awareness on the potential adversarial stakeholder engagement helps in effectively managing the sustained stakeholder relationships and mental well-being of project stakeholders. Originality/value This research contributes to project management practice, as it reveals the underlying factors of adverse situations occurring during multi-stakeholders’ engagement, provides clarity on their components and ranks them in terms of importance for their overall effect on stakeholders’ engagement.

ACS Style

Krishnan Mysore; Konstantinos Kirytopoulos; Seungjun Ahn; Tony Ma. Adversarial factors in multi-stakeholders’ engagement of global-IT projects. International Journal of Managing Projects in Business 2019, 14, 445 -471.

AMA Style

Krishnan Mysore, Konstantinos Kirytopoulos, Seungjun Ahn, Tony Ma. Adversarial factors in multi-stakeholders’ engagement of global-IT projects. International Journal of Managing Projects in Business. 2019; 14 (2):445-471.

Chicago/Turabian Style

Krishnan Mysore; Konstantinos Kirytopoulos; Seungjun Ahn; Tony Ma. 2019. "Adversarial factors in multi-stakeholders’ engagement of global-IT projects." International Journal of Managing Projects in Business 14, no. 2: 445-471.

Conference paper
Published: 01 October 2019 in 2019 IEEE International Symposium on Mixed and Augmented Reality Adjunct (ISMAR-Adjunct)
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This research investigates applying Augmented Reality (AR) visualisation of spatial cues in first-person view task instruction videos. Instructional videos are becoming popular, and are not only used in formal education and training, but even in everyday life as more people seek for how-to videos when they need help with instructions. However, video clips are 2D visualisation of the task space, sometimes making it hard for the viewer to follow and match the objects in the video to those in the real-world task space. We propose augmenting task instruction videos with 3D visualisation of spatial cues to overcome this problem, focusing on creating and viewing first-person view instruction videos. As a proof of concept, we designed and implemented a prototype system, called AR Tips, which allows users to capture and watch first-person view instructional videos on a wearable AR device, augmented with 3D visual cues shown in-situ at the task environment. Initial feedback from potential end users indicate that the prototype system is very easy to use and could be applied to various scenarios.

ACS Style

Gun Lee; Seungjun Ahn; William Hoff; Mark Billinghurst. AR Tips: Augmented First-Person View Task Instruction Videos. 2019 IEEE International Symposium on Mixed and Augmented Reality Adjunct (ISMAR-Adjunct) 2019, 34 -36.

AMA Style

Gun Lee, Seungjun Ahn, William Hoff, Mark Billinghurst. AR Tips: Augmented First-Person View Task Instruction Videos. 2019 IEEE International Symposium on Mixed and Augmented Reality Adjunct (ISMAR-Adjunct). 2019; ():34-36.

Chicago/Turabian Style

Gun Lee; Seungjun Ahn; William Hoff; Mark Billinghurst. 2019. "AR Tips: Augmented First-Person View Task Instruction Videos." 2019 IEEE International Symposium on Mixed and Augmented Reality Adjunct (ISMAR-Adjunct) , no. : 34-36.

Conference paper
Published: 04 October 2018 in Advances in Informatics and Computing in Civil and Construction Engineering
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The increased affordability of mobile devices, wider network coverage, and better mobile applications have changed the ways communication and information transfer take place in the construction industry in both developed and developing countries. While considerable research has been conducted on the extent of usage of mobile information and communication technologies (mobile ICT) and development of prototype applications in the context of construction projects, less attention has been paid on examining the perceptions of construction management (CM) professionals regarding implications of using mobile ICT. The present study identified different ways in which the use of mobile ICT translates into better productivity in construction projects. A questionnaire survey conducted across the Indian construction industry revealed that the use of mobile ICT improves construction productivity due to four factors: (1) improved communication and information flow, (2) better project execution, (3) improved access to data, and (4) proper defect management. While attributes related to communication and access to information received high rankings, the respondents perceived that the use of mobile ICT has low positive influence on attributes such as cost savings, speed of construction, sustainability, and construction errors.

ACS Style

Abid Hasan; Kumar Neeraj Jha; Raufdeen Rameezdeen; Seungjun Ahn; Bassam Baroudi. Perceived Productivity Effects of Mobile ICT in Construction Projects. Advances in Informatics and Computing in Civil and Construction Engineering 2018, 165 -172.

AMA Style

Abid Hasan, Kumar Neeraj Jha, Raufdeen Rameezdeen, Seungjun Ahn, Bassam Baroudi. Perceived Productivity Effects of Mobile ICT in Construction Projects. Advances in Informatics and Computing in Civil and Construction Engineering. 2018; ():165-172.

Chicago/Turabian Style

Abid Hasan; Kumar Neeraj Jha; Raufdeen Rameezdeen; Seungjun Ahn; Bassam Baroudi. 2018. "Perceived Productivity Effects of Mobile ICT in Construction Projects." Advances in Informatics and Computing in Civil and Construction Engineering , no. : 165-172.

Conference paper
Published: 04 October 2018 in Advances in Informatics and Computing in Civil and Construction Engineering
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Due to increased affordability of mobile devices, better network coverage, and availability of a wide range of mobile applications, the use of mobile information and communication technologies (mobile ICT) has increased significantly in construction projects. While considerable research on both positive and negative implications of using mobile ICT has been conducted in different industries and social contexts, relatively few studies have examined the perception of construction management (CM) professionals. A questionnaire survey conducted across the Indian construction industry revealed that the use of mobile ICT could impede construction productivity due to factors such as: (1) pressure to remain accessible outside the work hours, (2) temptation to check it frequently, (3) adverse effects on work-life balance, (4) compulsion to work outside the normal work hours, (5) massive amount of information, (6) distraction, (7) less time to respond to changes, (8) loss of productive time due to personal internet usage, (9) adverse effects on health of the users, and (10) frequent drawing changes. Since potential applications of mobile ICT in construction projects present enormous opportunities for CM professionals, these issues need to be addressed through user awareness, training, and organizational policies.

ACS Style

Abid Hasan; Kumar Neeraj Jha; Raufdeen Rameezdeen; Seungjun Ahn; Bassam Baroudi. The Negative Effects of Mobile ICT on Productivity in Indian Construction Projects. Advances in Informatics and Computing in Civil and Construction Engineering 2018, 281 -287.

AMA Style

Abid Hasan, Kumar Neeraj Jha, Raufdeen Rameezdeen, Seungjun Ahn, Bassam Baroudi. The Negative Effects of Mobile ICT on Productivity in Indian Construction Projects. Advances in Informatics and Computing in Civil and Construction Engineering. 2018; ():281-287.

Chicago/Turabian Style

Abid Hasan; Kumar Neeraj Jha; Raufdeen Rameezdeen; Seungjun Ahn; Bassam Baroudi. 2018. "The Negative Effects of Mobile ICT on Productivity in Indian Construction Projects." Advances in Informatics and Computing in Civil and Construction Engineering , no. : 281-287.

Journal article
Published: 04 April 2018 in Sustainability
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With the purpose of reducing the amount of construction and demolition (C&D) waste disposed to landfills, many countries and municipalities have introduced increasingly stringent C&D waste disposal charges (CDWDC) but the level of CDWDC is often determined without a clear understanding of its broad and complex impacts. Against this background, this paper aims to propose a system dynamics (SD) model that can help predict CDWDC’s environmental implications as well as its financial implications. Specifically, the proposed model explains complex causal relationships between variables such as the level of CDWDC, the amount of C&D waste disposed to landfills, the government’s revenues from CDWDC as well as the costs of supplying and operating landfills over time. For a case study, the developed model is customized and calibrated with actual data from Hong Kong, where the remaining capacities of existing landfills are limited and the need for supplying more landfills is imminent. The simulation analysis with the model predicts that the current charging levels may not be high enough to effectively control the amount of C&D waste disposed to landfills or to compensate for the costs to the government of supplying additional landfills. The analysis also predicts how much illegal dumping may increase as the level of CDWDC increases. This case study illustrates that the proposed SD model can help policy makers to see the potential impacts of increased CDWDC on the amount of C&D waste disposed to landfills, government costs and the amount of illegal dumping of C&D waste; and can therefore help them to determine the most appropriate level of CDWDC.

ACS Style

Lai Au; Seungjun Ahn; Tae Kim. System Dynamic Analysis of Impacts of Government Charges on Disposal of Construction and Demolition Waste: A Hong Kong Case Study. Sustainability 2018, 10, 1077 .

AMA Style

Lai Au, Seungjun Ahn, Tae Kim. System Dynamic Analysis of Impacts of Government Charges on Disposal of Construction and Demolition Waste: A Hong Kong Case Study. Sustainability. 2018; 10 (4):1077.

Chicago/Turabian Style

Lai Au; Seungjun Ahn; Tae Kim. 2018. "System Dynamic Analysis of Impacts of Government Charges on Disposal of Construction and Demolition Waste: A Hong Kong Case Study." Sustainability 10, no. 4: 1077.

Journal article
Published: 01 January 2018 in Journal of Management in Engineering
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ACS Style

Estacio Pereira; Seungjun Ahn; Sanguk Han; Simaan Abourizk. Identification and Association of High-Priority Safety Management System Factors and Accident Precursors for Proactive Safety Assessment and Control. Journal of Management in Engineering 2018, 34, 04017041 .

AMA Style

Estacio Pereira, Seungjun Ahn, Sanguk Han, Simaan Abourizk. Identification and Association of High-Priority Safety Management System Factors and Accident Precursors for Proactive Safety Assessment and Control. Journal of Management in Engineering. 2018; 34 (1):04017041.

Chicago/Turabian Style

Estacio Pereira; Seungjun Ahn; Sanguk Han; Simaan Abourizk. 2018. "Identification and Association of High-Priority Safety Management System Factors and Accident Precursors for Proactive Safety Assessment and Control." Journal of Management in Engineering 34, no. 1: 04017041.

Journal article
Published: 01 July 2017 in Journal of Management in Engineering
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A number of researchers have proposed and demonstrated that worker behavior is one of the main factors in construction safety. Working within the parameters of worker safety awareness and behavior, many researchers have recently suggested that shared values and customs, i.e., group norms, play an important role in shaping individual workers’ safety behavior. Regarding how individuals’ behavior is under the influence of group norms, the social identity theory suggests that people perceive themselves as a member of a group, depersonalize the self, and base their beliefs and behavior on the norms of the group. Despite the clarity of this configuration, the extent to which construction workers’ safety attitudes and behaviors are influenced by group norms, and the degree to which social identification is involved in this process, remains unclear. In particular, the transient nature of construction worker employment and multiple identities that a construction worker might hold make it difficult to understand the influence of group norms on workers’ safety behavior. To address these knowledge gaps, this paper aims to identify the (1) influence of group norms on a construction worker’s personal standards regarding safety behavior, (2) current status of construction workers’ social identities, and (3) impact of social identification on the influence that group norms have on construction workers’ personal standards regarding safety behavior. To achieve these objectives, empirical data were collected from 82 construction workers and nine project managers from three different construction sites using behavioral economic experiments along with surveys, and the data were analyzed using quantitative methods, such as correlation analysis, regression analysis, and t-tests. The analyses demonstrate that there is a measurable difference between construction workers’ personal standards and the norms desired by project managers regarding safety behavior and that construction workers’ personal standards regarding safety behavior are significantly influenced by their perceived group norms. The analyses also demonstrate that construction workers identify themselves with the different groups to which they belong (e.g., workgroup, trade, union, company, project) to significantly different degrees and that the salience of social identity with a group moderates the influence that the group’s norms have on personal standards regarding safety behavior in construction workers. These findings suggest a new way of thinking about safety management in construction; promoting project-wide positive norms combined with improved project identity can be an effective means of improving workers’ safety behavior in construction projects.

ACS Style

Byungjoo Choi; Seungjun Ahn; Sanghyun Lee. Construction Workers’ Group Norms and Personal Standards Regarding Safety Behavior: Social Identity Theory Perspective. Journal of Management in Engineering 2017, 33, 04017001 .

AMA Style

Byungjoo Choi, Seungjun Ahn, Sanghyun Lee. Construction Workers’ Group Norms and Personal Standards Regarding Safety Behavior: Social Identity Theory Perspective. Journal of Management in Engineering. 2017; 33 (4):04017001.

Chicago/Turabian Style

Byungjoo Choi; Seungjun Ahn; Sanghyun Lee. 2017. "Construction Workers’ Group Norms and Personal Standards Regarding Safety Behavior: Social Identity Theory Perspective." Journal of Management in Engineering 33, no. 4: 04017001.

Conference paper
Published: 13 June 2017 in Computing in Civil Engineering 2017
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ACS Style

Cenfei Sun; Seungjun Ahn; Changbum Ahn. Investigating the Impact of Human Risk Taking Tendency on the Likelihood of Struck-By Accidents in Construction Using Agent-Based Simulation. Computing in Civil Engineering 2017 2017, 306 -314.

AMA Style

Cenfei Sun, Seungjun Ahn, Changbum Ahn. Investigating the Impact of Human Risk Taking Tendency on the Likelihood of Struck-By Accidents in Construction Using Agent-Based Simulation. Computing in Civil Engineering 2017. 2017; ():306-314.

Chicago/Turabian Style

Cenfei Sun; Seungjun Ahn; Changbum Ahn. 2017. "Investigating the Impact of Human Risk Taking Tendency on the Likelihood of Struck-By Accidents in Construction Using Agent-Based Simulation." Computing in Civil Engineering 2017 , no. : 306-314.

Journal article
Published: 01 May 2017 in Journal of Construction Engineering and Management
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During the last several decades, behavior-based safety (BBS) has drawn a considerable amount of attention in the construction industry. The focus of BBS is on improving construction workers’ safety behavior through feedback and increased self-awareness and motivation. Among the influencing factors of safety behavior, social norm is known to be a powerful mechanism that regulates workers’ safety behavior. However, it is unclear how social norms are developed and through which process social norms influence an individual worker’s safety behavior in construction projects. Additionally, the temporary and contract-based nature of employment in construction projects makes understanding the influence of different social norms on workers’ safety behavior in construction projects especially difficult. Given this background, this paper aims to better understand the process by which different social norms exert control over construction workers’ safety behavior. To achieve this goal, empirical data were collected from 284 workers from eight construction sites in the United States, Korea, and Saudi Arabia using surveys, and the data were analyzed. The results demonstrate that workers’ safety behavior is influenced by perceived management norm, perceived workgroup norm, and personal attitude, and perceived workgroup norm mediates the relationship between perceived management norm and safety behavior. In addition, it is shown that social identification with the project intensifies the relationship between perceived management norm and safety behavior and attenuates the relationship between perceived workgroup norm and safety behavior. These findings contribute to the body of knowledge on construction safety by providing an explicative model for how social norms influence workers’ safety behavior, and suggest that a sociopsychological approach to promote project identity and reinforce favorable social norms in construction workers can be an effective means of improving construction safety.

ACS Style

Byungjoo Choi; Seungjun Ahn; Sanghyun Lee. Role of Social Norms and Social Identifications in Safety Behavior of Construction Workers. I: Theoretical Model of Safety Behavior under Social Influence. Journal of Construction Engineering and Management 2017, 143, 04016124 .

AMA Style

Byungjoo Choi, Seungjun Ahn, Sanghyun Lee. Role of Social Norms and Social Identifications in Safety Behavior of Construction Workers. I: Theoretical Model of Safety Behavior under Social Influence. Journal of Construction Engineering and Management. 2017; 143 (5):04016124.

Chicago/Turabian Style

Byungjoo Choi; Seungjun Ahn; Sanghyun Lee. 2017. "Role of Social Norms and Social Identifications in Safety Behavior of Construction Workers. I: Theoretical Model of Safety Behavior under Social Influence." Journal of Construction Engineering and Management 143, no. 5: 04016124.