Chen, W., Hua, Z., Zhang, Z. G., & Bi, W. (2018). Analysis of Freemium Business Model Considering Network Externalities and Consumer Uncertainty. Journal of Systems Science and Systems Engineering, 27(1), 78-105. http://doi.org/10.1007/s11518-017-5342-8

Sheu, S. H., Liu, T. H., Zhang, Z. G., & Tsai, H. N. (2018). The generalized age maintenance policies with random working times. Reliability Engineering and System Safety, 169, 503-514. http://doi.org/10.1016/j.ress.2017.09.003

Wang, F., Wang, J., & Zhang, Z. G. (2017). Strategic behavior and social optimization in a double-ended queue with gated policy. Computers and Industrial Engineering, 114, 264-273. http://doi.org/10.1016/j.cie.2017.10.011

Zhang, G. Z. (. N., & Lin, X. (2017). Hierarchical modeling of stochastic manufacturing and service systems. Frontiers of Engineering Management, 4(3), 295-303. http://doi.org/10.15302/J-FEM-2017047

Tsai, H. N., Sheu, S. H., & Zhang, Z. G. (2017). A trivariate optimal replacement policy for a deteriorating system based on cumulative damage and inspections. Reliability Engineering and System Safety, 160, 74-88. http://doi.org/10.1016/j.ress.2016.10.031

Hua, Z., Chen, W., & Zhang, Z. G. (2016). Competition and Coordination in Two-Tier Public Service Systems under Government Fiscal Policy. Production and Operations Management, 25(8), 1430-1448. http://doi.org/10.1111/poms.12555

Chen, W., Zhang, G. G., & Hua, Z. (2016). Analysis of price competition in two-tier service systems. Journal of the Operational Research Society, 67(6), 897-910.

Huang, P., Luh, H., & Zhang, Z. G. (2016). A queueing model for tiered inspection lines in airports. International Journal of Information and Management Sciences, 27(2), 147-177. http://doi.org/10.6186/IJIMS.2016.27.2.5

Sheu, S. H., Chen, Y. L., Chang, C. C., & Zhang, Z. G. (2016). A note on a two variable block replacement policy for a system subject to non-homogeneous pure birth shocks. Applied Mathematical Modelling, 40(5-6), 3703-3712. http://doi.org/10.1016/j.apm.2015.10.001

Chen, W., Zhang, Z. G., & Hua, Z. (2015). Analysis of two-tier public service systems under a government subsidy policy. Computers and Industrial Engineering, 90, 146-157. http://doi.org/10.1016/j.cie.2015.08.009

Wang, S. X., Fu, Y. B., & Zhang, Z. G. (2015). Population growth and the environmental Kuznets curve. China Economic Review, 36, 146-165. http://doi.org/10.1016/j.chieco.2015.08.012

Sheu, S. H., Liu, T. H., Zhang, Z. G., & Chien, Y. H. (2015). Extended Optimal Replacement Policy for a Two-Unit System with Shock Damage Interaction. IEEE Transactions on Reliability, 64(3), 998-1014. http://doi.org/10.1109/TR.2015.2427231

Sheu, S. H., Chang, C. C., Chen, Y. L., & George Zhang, Z. (2015). Optimal preventive maintenance and repair policies for multi-state systems. Reliability Engineering and System Safety, 140, 78-87. http://doi.org/10.1016/j.ress.2015.03.029

Chien, Y. H., & Zhang, Z. G. (2015). Analysis of a hybrid warranty policy for discrete-time operating products. IIE Transactions (Institute of Industrial Engineers), 47(5), 442-459. http://doi.org/10.1080/0740817X.2014.953645

Sheu, S. H., Liu, T. H., Zhang, Z. G., & Ke, J. C. (2015). Extended preventive replacement policy for a two-unit system subject to damage shocks. International Journal of Production Research, 53(15), 4614-4628. http://doi.org/10.1080/00207543.2015.1005250

Wang, S. L., Chen, C. C., & Zhang, Z. G. (2015). A context-aware knowledge map to support ubiquitous learning activities for a u-Botanical museum. Australasian Journal of Educational Technology, 31(4), 470-485. http://doi.org/10.14742/ajet.1205

Liu, Z., Ma, Y., & Zhang, Z. G. (2015). Equilibrium mixed strategies in a discrete-time Markovian queue under multiple and single vacation policies. Quality Technology and Quantitative Management, 12(3), 367-380. http://doi.org/10.1080/16843703.2015.11673387

He, L. H., Li, S. B., Gao, Q., & Zhang, Z. G. (2015). Improving operational efficiency for a two-way highway toll station. Quality Technology and Quantitative Management, 12(3), 353-366. http://doi.org/10.1080/16843703.2015.11673386

Sheu, S. H., Liu, T. H., Zhang, Z. G., & Chang, T. M. (2014). Optimal number of repairs before replacement for a two-unit system subject to non-homogeneous pure birth process. Computers and Industrial Engineering, 69(1), 71-76. http://doi.org/10.1016/j.cie.2013.12.006

Guo, P., Lindsey, R., & Zhang, Z. G. (2014). On the downs-thomson paradox in a self-financing two-tier queuing system. Manufacturing and Service Operations Management, 16(2), 315-322. http://doi.org/10.1287/msom.2014.0476

Bai, J. M., Zhang, Z. G., & Li, Z. H. (2014). Lifetime properties of a cumulative shock model with a cluster structure. Annals of Operations Research, 212(1), 21-41. http://doi.org/10.1007/s10479-012-1255-6

Kuo, C. C., Sheu, S. H., Ke, J. C., & Zhang, Z. G. (2014). Reliability-based measures for a retrial system with mixed standby components. Applied Mathematical Modelling, 38(19-20), 4640-4651. http://doi.org/10.1016/j.apm.2014.03.005

Guo, P., & Zhang, Z. G. (2013). Strategic queueing behavior and its impact on system performance in service systems with the congestion-based staffing policy. Manufacturing and Service Operations Management, 15(1), 118-131. http://doi.org/10.1287/msom.1120.0406

Zong, S., Chai, G., Zhang, Z. G., & Zhao, L. (2013). Optimal replacement policy for a deteriorating system with increasing repair times. Applied Mathematical Modelling, 37(23), 9768-9775. http://doi.org/10.1016/j.apm.2013.05.019

Sheu, S. H., Zhang, Z. G., Chien, Y. H., & Huang, T. H. (2013). Age replacement policy with lead-time for a system subject to non-homogeneous pure birth shocks. Applied Mathematical Modelling, 37(14-15), 7717-7725. http://doi.org/10.1016/j.apm.2013.03.017

Sheu, S. H., & Zhang, Z. G. (2013). An optimal age replacement policy for multi-state systems. IEEE Transactions on Reliability, 62(3), 722-735. http://doi.org/10.1109/TR.2013.2270427

Zhang, Z. G., Kim, I., Springer, M., Cai, G., & Yu, Y. (2013). Dynamic pooling of make-to-stock and make-to-order operations. International Journal of Production Economics, 144(1), 44-56. http://doi.org/10.1016/j.ijpe.2013.01.012

Ke, J. C., Hsu, Y. L., Liu, T. H., & George Zhang, Z. (2013). Computational analysis of machine repair problem with unreliable multi-repairmen. Computers and Operations Research, 40(3), 848-855. http://doi.org/10.1016/j.cor.2012.10.004

Sheu, S. H., Chen, Y. L., Chang, C. C., & Zhang, Z. G. (2013). Optimal number of repairs before replacement for a system subject to shocks of a non-homogeneous pure birth process. IEEE Transactions on Reliability, 62(1), 73-81. http://doi.org/10.1109/TR.2013.2241195

Sheu, S. H., Chen, Y. L., Chang, C. C., & Zhang, Z. G. (2013). Extended optimal replacement policy for a system subject to non-homogeneous pure birth shocks. Computers and Industrial Engineering, 64(2), 573-579. http://doi.org/10.1016/j.cie.2012.11.009

Ke, J. C., Wu, C. H., & Zhang, Z. G. (2013). A note on a multi-server queue with vacations of multiple groups of servers. Quality Technology and Quantitative Management, 10(4), 513-525. http://doi.org/10.1080/16843703.2013.11673428

Samanta, S. K., & Zhang, Z. G. (2012). Stationary analysis of a discrete-time GI/D-MSP/1 queue with multiple vacations. Applied Mathematical Modelling, 36(12), 5964-5975. http://doi.org/10.1016/j.apm.2012.01.049

Sheu, S. H., Chen, Y. L., Chang, C. C., & Zhang, Z. G. (2012). A block replacement policy for systems subject to non-homogeneous pure birth shocks. IEEE Transactions on Reliability, 61(3), 741-748. http://doi.org/10.1109/TR.2012.2206270

Chien, Y. H., Sheu, S. H., & Zhang, Z. G. (2012). Optimal maintenance policy for a system subject to damage in a discrete time process. Reliability Engineering and System Safety, 103, 1-10. http://doi.org/10.1016/j.ress.2012.03.002

Zhang, G. G., & Fu, Y. B. (2012). Is the trailing-stop strategy always good for stock trading? International Journal of Operations Research, 9(3), 129-140. http://doi.org/10.1.1.401.7584

Sheu, S. H., Chang, C. C., Zhang, Z. G., & Chien, Y. H. (2012). A note on replacement policy for a system subject to non-homogeneous pure birth shocks. European Journal of Operational Research, 216(2), 503-508. http://doi.org/10.1016/j.ejor.2011.07.056

Zhang, Z. G., Luh, H. P., & Wang, C. H. (2011). Modeling security-check queues. Management Science, 57(11), 1979-1995. http://doi.org/10.1287/mnsc.1110.1399

Ke, J. C., Lin, C. H., Huang, H. I., & Zhang, Z. G. (2011). An algorithmic analysis of multi-server vacation model with service interruptions. Computers and Industrial Engineering, 61(4), 1302-1308. http://doi.org/10.1016/j.cie.2011.08.003

Chang, C. C., Sheu, S. H., Chen, Y. L., & Zhang, Z. G. (2011). A multi-criteria optimal replacement policy for a system subject to shocks. Computers and Industrial Engineering, 61(4), 1035-1043. http://doi.org/10.1016/j.cie.2011.06.017

Wang, J. Z., Wang, J. J., Zhang, Z. G., & Guo, S. P. (2011). Forecasting stock indices with back propagation neural network. Expert Systems with Applications, 38(11), 14346-14355. http://doi.org/10.1016/j.eswa.2011.04.222

Tadj, L., Zhang, Z. G., & Tadj, C. (2011). A queueing analysis of multi-purpose production facility's operations. Journal of Industrial and Management Optimization, 7(1), 19-30. http://doi.org/10.3934/jimo.2011.7.19

Zhang, Z. G., Tadj, L., & Bounkhel, M. (2011). Cost evaluation in M/G/1 queue with T-policy revisited, technical note. European Journal of Operational Research, 214(3), 814-817. http://doi.org/10.1016/j.ejor.2011.05.043

Zhang, G. G., Tian, N., Love, E. E., & Ma, Z. (2011). Analysis of queues with an imperfectly repairable server. International Journal of Operations Research, 8(2), 1-7. http://doi.org/10.1.1402.1033

Ke, J., Wu, C., & Zhang, Z. G. (2010). Recent developments in vacation queueing models: A short survey. International Journal of Operations Research, 7(4), 3-8. http://doi.org/10.1.1.401.8718

Sheu, S. H., Chang, C. C., Chen, Y. L., & Zhang, Z. G. (2010). A periodic replacement model based on cumulative repair-cost limit for a system subjected to shocks. IEEE Transactions on Reliability, 59(2), 374-382. http://doi.org/10.1109/TR.2010.2048733

Ke, J. C., Lin, C. H., Yang, J. Y., & Zhang, Z. G. (2009). Optimal (d, c) vacation policy for a finite buffer M/M/c queue with unreliable servers and repairs. Applied Mathematical Modelling, 33(10), 3949-3962. http://doi.org/10.1016/j.apm.2009.01.008

Chen, Y., Xu, M., & Zhang, Z. G. (2009). A risk-averse newsvendor model under the CVaR criterion. Operations Research, 57(4), 1040-1044. http://doi.org/10.1287/opre.1080.0603

Zhang, Z. G. (2009). Performance analysis of a queue with congestion-based staffing policy. Management Science, 55(2), 240-251. http://doi.org/10.1287/mnsc.1080.0914

Zhang, Z. G. (2009). A note on workload control for an under-utilized server of M/G/1 system. Computers and Industrial Engineering, 56(1), 28-32. http://doi.org/10.1016/j.cie.2008.03.011

Li, J. H., Tian, N. S., Zhang, Z. G., & Luh, H. P. (2009). Analysis of the M/G/1 queue with exponentially working vacations-a matrix analytic approach. Queueing Systems, 61(2-3), 139-166. http://doi.org/10.1007/s11134-008-9103-8

Cai, G. (., Zhang, Z. G., & Zhang, M. (2009). Game theoretical perspectives on dual-channel supply chain competition with price discounts and pricing schemes. International Journal of Production Economics, 117(1), 80-96. http://doi.org/10.1016/j.ijpe.2008.08.053

Tan, N., & Zhang, G. G. (2006). Vacation queueing models. Springer-Verlag (UK). http://doi.org/10.1007/978-0-387-33723-4