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Dohyung Kee

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Publications by Dohyung Kee (bibliography)

1995

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Chung, Min K., Kee, Dohyung and Kim, Sang H. (1995): Comparison of the Prediction Models for the L5/S1 Compressive Forces under Varying Asymmetric Lifting Conditions. In: Proceedings of the Human Factors and Ergonomics Society 39th Annual Meeting 1995. pp. 704-708.

“In this study, comparisons were made among three representative methods for predicting compressive forces on the lumbosacral disc: LP-based model, double LP-based model and EMG-assisted model. Two subjects simulated lifting tasks that were frequently performed in the refractories industry in Korea, in which vertical distance, frontal plane horizontal distance, and weight of load were varied. To calculate the L5/S1 compressive forces, EMG signals from six trunk muscles were measured and postural data were recorded using the Motion Analysis System. The EMG-assisted model was shown to reflect well all three factors considered here. On the other hand, the compressive forces of the two LP-based models were significantly affected only by weight of load. Furthermore, relatively low correlation was observed between the compressive force of the EMG-assisted model and the 1991 NIOSH lifting index (LI), while highly positive correlation was observed between that of the two LP-based models and LI.”

1992

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Jung, Eui S., Kee, Dohyung and Chung, Min K. (1992): Reach Posture Prediction of Upper Limb for Ergonomic Workspace Evaluation. In: Proceedings of the Human Factors Society 36th Annual Meeting 1992. pp. 702-706.

“Proper assessment of reach posture is one of the essential functions for ergonomic workspace evaluation in CAD systems with a built-in man-model. In this study, each upper limb is modelled as a four-link system, consisting of trunk, upper arm, lower arm, and hand, being regarded as a redundant manipulator with a total of eight degrees of freedom. Inverse kinematics is introduced in this study to predict the trajectory of multi-link segmental movement. Among several kinematic methods for solving the multi-link system, the resolved motion method was found to be effective to solve this redundant manipulator model, and the joint range availability was used as a performance function in order to guarantee local optimality. Real reach postures taken from the subject were analyzed by Motion Analysis System and showed reasonable results when compared to those obtained from the model.”

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