J38. Lee, E., Ju, J., Byon, E. and Ko, Y. M.* (2023), "Condition-based Selective Maintenance Optimization for Large-scale Systems Consisting of Many Homogeneous Units," IEEE Transactions on Reliability, online published, (DOI:10.1109/TR.2023.3335903), an accepted version available here. 

J37. Baik, S. M. and Ko, Y. M.* (2023), "QoS-aware energy-efficient workload routing and server speed control policy in data centers: a robust queueing theoretic approach," IISE Transactions (on Operations Engineering and Analytics), 55(12), 1242-1255  (DOI:10.1080/24725854.2023.2183531), preprint available at arXiv.

J36. Cho, Y., Baik, S. M. and Ko. Y. M.* (2023), "Reliability Improvement of Circular k-out-of-n: G Balanced Systems through Center of Gravity," IEEE Access, 11, 91407-91422 (DOI:10.1109/ACCESS.2023.3308204), preprint available at arXiv.

J35. Kim, J., Park, E., Cho, S., Kwon, K. and Ko. Y. M.* (2023), "Probabilistic Modeling of Fish Growth in Smart Aquaculture Systems,"  KSII Transactions on Internet and Information Systems, 17(8), 2259-2277 (DOI:10.3837/tiis.2023.08.017).

J34. Barde, S., Ko, Y. M. and Shin, H.* (2022), "General EM Algorithm for Fitting Non-Monotone Hazard Functions from Truncated and Censored Observations," Operations Research Letters, 50(5), 476-483 (DOI:10.1016/j.orl.2022.07.001).

J33. Ko, Y. M. and Byon, E.* (2022), "Optimal budget allocation for stochastic simulation with importance sampling: exploration vs. replication," IISE Transactions  (on Data Science, Quality and Reliability), 54(9), 881-893 (featured in the August issue 2022 of the ISE Magazine by Editor-in-Chief of IISE Transactions) (DOI:10.1080/24725854.2021.1953197), an accepted version available here.

J32. Cho, Y. and Ko, Y. M.* (2022), "Power- and QoS-Aware Job Assignment with Dynamic Speed Scaling for Cloud Data Center Computing," IEEE Access, 10, 38284-38298 (DOI:10.1109/ACCESS.2022.3165566).

J31. Li, S., Ko, Y. M. and Byon, E.* (2021), "Nonparametric Importance Sampling for Wind Turbine Reliability Analysis with Stochastic Computer Models," Annals of Applied Statistics, 15(4), 1850-1871 (DOI:10.1214/21-AOAS1490).

J30. Jeong, D., Park, C. and Ko, Y. M.* (2021), "Missing Data Imputation using Mixture Factor Analysis for Building Electric Load Data," Applied Energy, 304, 117655 (DOI:10.1016/j.apenergy.2021.117655).

J29. Pan, Q., Ko, Y. M. and Byon, E.* (2021), "Uncertainty Quantification for Extreme Quantile Estimation with Stochastic Computer Models," IEEE Transactions on Reliability, 70(1), 134-145 (DOI:10.1109/TR.2020.2980448 ).

J28. Jeong, D., Park, C. and Ko, Y. M.* (2021), "Short-term electric load forecasting for buildings using logistic mixture vector autoregressive model with curve registration," Applied Energy, 282, 116249 (DOI:10.1016/j.apenergy.2020.116249).

J27. Endharta, A. J. and Ko, Y. M.* (2020), "Economic Design and Maintenance of a Circular k-out-of-n: G Balanced System with Load-Sharing Units," IEEE Transactions on Reliability,  69(4), 1465-1479 (DOI: 10.1109/TR.2020.2969236).

J26. Ryu, D.-H., Kim, R.-H., Choi, S.-H., Kim, K.-J., Ko, Y. M., Kim, Y.-J., Song, M. and Choi. D. G. (2020), "Utilizing Electricity Consumption Data to Assess the Noise Discomfort Caused by Electrical Appliances between Neighbors: A Case Study of a Campus Apartment Building," Sustainability, 12(20), 8704 (DOI:10.3390/su12208704)

J25. Pan, Q., Byon, E.*, Ko, Y. M. and Lam, H. (2020), "Adaptive Importance Sampling for Extreme Quantile Estimation with Stochastic Black Box Computer Models," Naval Research Logistics, 67(7), 524-547 (DOI: 10.1002/nav.21938).

J24. Barde, S., Ko, Y. M. and Shin, H.* (2020), "Fitting Discrete Phase-type Distribution from Censored and Truncated Observations with Pre-specified Hazard Sequence," Operations Research Letters, 48(3), 233-239 (DOI:10.1016/j.orl.2020.02.009).

J23. Cho, Y. and Ko, Y. M.* (2020), "Stabilizing the virtual response time in single-server processor sharing queues with slowly time-varying arrival rates," Annals of Operations Research, 293, 27-55 (DOI: 10.1007/s10479-019-03511-9 ), preprint available (arxiv).

J22. Oh, C. H., Kim, M. H., Kim, B.-I. and Ko, Y. M.* (2019), "An Efficient Building Evacuation Algorithm in Congested Networks," IEEE Access, 7(1), 169480-169494 (DOI:10.1109/ACCESS.2019.2955477).

J21. Ki, Y., Kim, B.-I.*, Ko, Y. M., Jeong, H., and Koo, J. (2018), "Charging Scheduling Problem of an M-to-N Electric Vehicle Charger," Applied Mathematical Modelling, 64, 603-614 (DOI:10.1016/j.apm.2018.07.060).

J20. Endharta, A. J., Yun, W. Y., and Ko, Y. M.* (2018), "Reliability Evaluation of Circular k-out-of-n: G Balanced Systems through Minimal Path Sets," Reliability Engineering & System Safety, 180, 226-236 (DOI:10.1016/j.ress.2018.07.023).

J19. Sun, H. Y., Ko, Y. M., Lee, S. W., Lee, B.* and Kim, J. H.* (2018), "The application rate for urology specialty compared with other specialties from 2007 to 2014 in Korea: is it influenced by social interest manifested by internet trends?," BMC Urology, 18, 65 (DOI:10.1186/s12894-018-0375-y).

J18. Ko, Y. M. and Pender, J.* (2018), "Strong approximations for time-varying infinite-server queues with non-renewal arrival and service processes," Stochastic Models, 34(2), 186-206 (DOI:10.1080/15326349.2018.1425886).

J17. Cho, Y. and Ko, Y. M.* (2018), "Energy Efficiency of Data Center Operating Practices: Server Clustering, Powering On/Off, and Bang-Bang Control," Networks, 71(2), 107-119 (DOI:10.1002/net.21752).

J16. Pender, J. and Ko, Y. M.* (2017), "Approximations for the Queue Length Distributions of Time-Varying Many-Server Queues," INFORMS Journal on Computing, 29(4), 688-704 (DOI:10.1287/ijoc.2017.0760).

J15. Kim, J. H.*, Sun, H. Y., Kim, H. J., Ko, Y. M., Chun, D.-I. and Park, J. Y.* (2017), "Does uneven geographic distribution of urologists affect bladder and prostate cancers mortality? National health insurance data in Korea from 2007 to 2011," Oncotarget, 8(39), 65292-65301 (DOI:10.18632/oncotarget.18036).

J14. Kim, H. J., Sun, H. Y., Choi, H., Park, J. Y., Bae, J. H., Doo, S. H., Yang, W. J., Song, Y. S., Ko, Y. M. and Kim, J. H.* (2017), "Efficacy and Safety of Initial Combination Treatment of an Alpha Blocker with an Anticholinergic Medication in Benign Prostatic Hyperplasia Patients with Lower Urinary Tract Symptoms: Updated Meta-Analysis," PLoS ONE, 12(1), e0169248 (DOI:10.1371/journal.pone.0169248).

J13 Shim, S. R., Kanhai, K., Ko, Y. M., and Kim, J. H.* (2017), "Efficacy and safety of prostatic arterial embolization: Systematic review with meta-analysis and meta-regression," The Journal of Urology, 197(2), 465-479 (DOI:10.1016/j.juro.2016.08.100).

J12. Ko, Y. M. and Pender, J.* (2017), "Diffusion Limits for the (MAPt/PHt/∞)N Queueing Network," Operations Research Letters, 45(3), 248-253 (DOI:10.1016/j.orl.2017.03.006).

J11. Ko, Y. M. and Byon, E.* (2017), "Condition-based joint maintenance optimization for a large-scale system with homogeneous units," IISE Transactions (on Data Science, Quality and Reliability), 49(5), 493-504 (DOI:10.1080/0740817X.2016.1241457).

J10. Song, Y. S., Shim, S. R., Jung, I., Sun, H. Y., Song, S. H., Kwon, S. S., Ko, Y. M., and Kim, J. H.* (2015), "Geographic Distribution of Urologists in Korea, 2007 to 2012," Journal of Korean Medical Science, 30(11), 1638-1645 (DOI:10.3346/jkms.2015.30.11.1638).

J9. Kim, J. H., Shim, S. R., Doo, S. W., Yang, W. J., Yoo, B. W., Kim, J. M., Ko, Y. M., Song, E. S., Lim, I. S., Lee, H. J.*, and Song, Y. S.* (2015), "Bladder recovery by stem cell based cell therapy in the bladder dysfunction induced by spinal cord injury: Systematic review and meta-analysis," PLoS ONE, 10(3), e0113491 (DOI:10.1371/journal.pone.0113491).

J8. Ko, Y. M.* (2015), "A simple analysis of the transient period in peer-to-peer networks," IEEE Communications Letters, 19(9), 1528-1531 (DOI:10.1109/LCOMM.2015.2446486), an accepted version available here.

J7. Ko, Y. M. and Byon, E.* (2015), "Reliability evaluation of large-scale systems with identical units," IEEE Transactions on Reliability, 64(1), 420-434 (DOI:10.1109/TR.2014.2368895), an accepted version available here.

J6. Kim, J. H, Kwon, S.-S., Shim, S. R., Sun, H. Y., Ko, Y. M., Chun, D.-I, Yang, W. J., and Song, Y. S.* (2014), "Validation and Reliability of a Smartphone Application for the International Prostate Symptom Score Questionnaire: A Randomized Repeated Measures Crossover Study," Journal of Medical Internet Research, 16(2), e38 (DOI:10.2196/jmir.3042).

J5. Ko, Y. M.* and Cho, Y. (2014), "A distributed speed scaling and load balancing algorithm for energy efficient data centers," Performance Evaluation, 79, 120-133 (Special issue for IFIP Performance 2014) (DOI:10.1016/j.peva.2014.07.008).

J4. Gallego, J., Ko, Y. M., Polansky, R., Perez, E., Ntaimo, L., and Gautam, N.* (2013), "Integrating virtualization, voltage scaling and powering on/off servers in data centers for energy efficiency," IIE Transactions (on Operations Engineering and Analytics), 45(10), 1114-1136 (featured in the September issue 2013 of Industrial Engineer by Editor-in-Chief of IIE Transactions) (DOI:10.1080/0740817X.2012.762484).

J3. Ko, Y. M. and Gautam, N.* (2013), "Critically loaded time-varying multiserver queues: computational challenges and approximations," INFORMS Journal on Computing, 25(2), 285-301 (DOI:10.1287/ijoc.1120.0502).

J2. Ko, Y. M. and Gautam, N.* (2010), "Transient analysis of queues for peer-based multimedia content delivery," IIE Transactions (on Operations Engineering and Analytics), 42(12), 881-896 (featured in the November issue 2010 of Industrial Engineer by Editor-in-Chief of IIE Transactions) (DOI:10.1080/0740817X.2010.491501).

J1. Ko, Y. M. and Gautam, N.* (2010), "Epidemic-based information dissemination in wireless mobile sensor networks," IEEE/ACM Transactions on Networking, 18(6), 1738-1751 (DOI:10.1109/TNET.2010.2048122).

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Authors in bold are our lab members.