J43. Xu, J., Ko, Y. M*., Kong, M. and Pender, J. (2025), "Queueing Management for Reducing the Overlaps of Customers in Service Systems," OR Spectrum, to appear, preprint available at SSRN, an accepted version available here (supplementary material available here).

J42. Pender, J.*, Ko, Y. M. and Xu, J. (2025), "The Number of Overlapping Customers in Erlang-A Queues: An Asymptotic Approach," Probability in the Engineering and Informational Sciences, online published (DOI:10.1017/S0269964824000251), paper available here.

J41. Kim, D., Kim, H., Chae M.*,  Ko, Y. M., Bae Y.-M., Sim H., Oh, Y. C, and Noh, K. H. (2025), "Using statistical models for optimal packaging in semiconductor manufacturing processes," Journal of the Korean Statistical Society, 54, 1-19, (DOI:10.1007/s42952-024-00284-1).

J40. Park, J., Byon, E.*, Ko, Y. M. and Shashaani. S. (2024), "Strata Design for Variance Reduction in Stochastic Simulation," Technometrics, online published, (DOI:10.1080/00401706.2024.2416411), an accepted version available here .

J39. Kim, J., Lee, H. and Ko, Y. M.* (2024), "Constrained Density-Based Spatial Clustering of Applications with Noise (DBSCAN) using Hyperparameter Optimization," Knowledge-based Systems, 303, 112436, (DOI:10.1016/j.knosys.2024.112436), an accepted version available here. 

J38. Lee, E., Ju, J., Byon, E. and Ko, Y. M.* (2024), "Condition-based Selective Maintenance Optimization for Large-scale Systems Consisting of Many Homogeneous Units," IEEE Transactions on Reliability, 73(2), 1393-1406 (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.