W3. Endharta, A. J. and Ko, Y. M.* (2019), "Economic Design and Maintenance of a Circular k-out-of-n: G Balanced System with Load-Sharing Units," under 3rd round review with minor revision

W2. Cho, Y. and Ko, Y. M.* (2019), "Stabilizing the virtual response time in single-server processor sharing queues with slowly time-varying arrival rates," under minor revision for 3rd round review

W1. Jung, I., Kim, J. H., Kang, S.-H. and Ko, Y. M.* (2017), "A Markov Chain Analysis for State Transitions of Hypertension Using Medical Checkup Data," working paper

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