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Automated RULA for a sequence of activities based on sensor data
WENNY FRANCISKA SENJAYA,FRANS PRATHAMA,FERI SETIAWAN,ARIA GHORA PRABONO,BERNARDO NUGROHO YAHYA,SEOK- LYONG LEE 대한산업공학회 2020 대한산업공학회 추계학술대회논문집 Vol.2020 No.11
Work-related Musculoskeletal Disorders (WMSDs) are a common concern in the manufacturing industry and are induced by postural load requirements of job tasks that affect to neck, trunk, and upper extremities. Ergonomics assessment, such as Rapid Upper Limb Assessment (RULA), can help industries to prevent and evaluate the risk of WMSDs. However, the experts perform RULA with manual observation which is a tedious and complex task. A few works have attempted to work on automatic RULA with focusing on single activity. This work aims to propose a framework of automated ergonomics assessment on the sequence of assembly activities from time-series sensor data collected from the body tracking sensor and hand motion sensor. The grand score is categorized into two, activity-level and final grand score. Both categories are evaluated by mode-based analysis and mean-based analysis. The analysis results show that the mean-based analysis is more representative than mode-based analysis. Most of our subjects have RULA final grand score of 6, these indicate that we need further investigation and change the layout of the workspace immediately to increase work productivity.
Process Discovery on Assembly Process using Multimodal Human Activity Recognition
차형주,박현우,Wenny Franciska Senjaya,Feri Setiawan,Aria Ghora Prabono,Frans Prathama,이석룡 대한산업공학회 2019 대한산업공학회 추계학술대회논문집 Vol.2019 No.11
HAR(Human Activity Recognition) is a research area that aims to recognize human activities from a series of observations. While many works dealt with vision-based HAR, this work focuses on sensor-based HAR. This study attempts to build a system architecture to recognize human activities and behaviors in a workplace environment using multimodal sensor. Multimodal sensors of assembly sequence process are being used to collect the body skeleton, hand tracking motion and upper limb motion data. The synchronization among those devices is done by using PAA(Piecewise Aggregate Approximation) with HTTP requests. Acquired dataset using above techniques was then used to form a classification model, using feature extraction and two types of classifier; i.e. Random Forest(83.44% accuracy score) and Ensemble Classifier(62.58% with 0.0667 Hamming loss). The activity recognized by the classification was used for process discovery based on fuzzy-miner algorithm. Finally, the constructed process model was compared to the original process model designed according to the working procedure.