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- 저자 : Brilakis (검색결과 2 건)
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Continuous localization of construction workers via integration of detection and tracking
Park, M.W.,Brilakis, I. Elsevier ; Elsevier Science Pub. Co 2016 AUTOMATION IN CONSTRUCTION - Vol.72 No.2
Tracking construction workers onsite yields trajectory data that can be very useful in safety and productivity monitoring. Tracking via cameras and computer vision-based methods is one of the tracking options available and deemed suitable for worker tracking in congested outdoor environments. However, this option has yet to yield a practical, robust solution, because of its poor performance in handling occlusions and maintaining trajectories over time. This is due, on one hand, to the tracking methods' degeneracy issues, and the use of detection methods only for initializing trackers. On the other hand, detection methods alone are unable to yield robust trajectories because they treat each frame independently and do not account for temporal effects. Furthermore, no detection method satisfies high performance requirements in both precision and recall. Higher precision entails lower recall. False positives or false negatives limit practical applications. To resolve these issues, this paper presents a hybrid method for locating construction workers that fuses tracking and detection together throughout the tracking process. The detection method is designed to hit higher precision while the tracking method supplements the reduced lower recall. Tracking allows entity matching across frames producing trajectories for all identified workers, while tracking of an occluded worker is automatically terminated and resumed when the occlusion gets cleared. Experimental tests on onsite videos demonstrate that the proposed combination improves overall tracking performance.
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현장외 시공 공법 채택의 영향 인자 및 활성화 방안 연구
김민구(Kim MinKoo),Brilakis,Ioannis,안윤규(An YunKyu) 한국BIM학회 2015 KIBIM Magazine Vol.5 No.3
Over a few decades, off-site construction (OSC) has been widely used for building and bridge constructions. OSC is a construction method that build structures at a different location than the location of use, and normally it occurs in a manufacturing plant. There are many studies on the perceived benefits of OSC, yet relatively few studies which quantitatively assess the benefits and factors affecting the decision of the use of OSC have been investigated. This study investigates the influencing factors of the use of OSC system and its revitalization solutions in the construction industry. As the research method, interview and questionnaire survey are conducted by visiting industry experts of OSC and sending a questionnaire to the OSC stakeholders including engineers, manufacturers, contractors and clients in the United Kingdom (UK). The construction industry of the UK is targeted for the study since it has a number of commons with the Korean construction industry in terms of the structure of the construction industry and current low take-up of the OSC. The survey provides the results that the reluctance of clients to use OSC is the key factor of the slow use of OSC despite of the perceived benefits of OSC. In addition, in order to revitalize OSC in the construction market, three revival recommendations are suggested based on the survey results.
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