Our research areas are around Applied Probability, Stochastic Process, Queueing Theory and their applications in Stochastic Systems. We have been developing models for call centers, data centers and 5g communication systems. We are also interested in developing new mathematical tools for analyzing stochastic models arising from real world systems. Some keywords of our research are as follows.
Methodologies: Applied Probability, Mathematical Engineering, Stochastic Models, Queueing Theory, Mathematical Models
Applications: Service Management, Information Systems, Resource Sharing Systems
We are very open, having been collaborating with many leading researchers in more than ten countries of four continents in the world! Please do not hesitate to contact us for possible collaboration or for joining our group as a member.
The following papers were accepted at DCCN' 20. Nazarov, A., PhungDuc, T., Paul, S. and Lizura, O., (2020), “AsymptoticDiffusion Analysis of Multiserver Retrial Queue with TwoWay Communication,” Accepted. Nazarov, A., PhungDuc, T. and Izmailova, Y. (2020), “Gaussian asymptotics for a multiclass M/M/1 retrial queueing system,” Accepted. NEW 

The following paper was accepted for presentation at NOLTA2020. *Nakamura, A., PhungDuc, T. and Ando, H. (2020), “A Stochastic Model for Car/RideShare Service by a Bus Company,” to be presented at NOLTA2020. NEW 

We submitted the following paper to an international conference. Nazarov, A., PhungDuc, T., Paul, S. and Lizura, O., (2020), “AsymptoticDiffusion Analysis of Multiserver Retrial Queue with TwoWay Communication,” Submitted. NEW 

We submitted the following paper to a journal. Morozov, E., Rogozin, S. Nguyen, Q. H., PhungDuc, T. (2020), “Modified Erlang loss system for cognitive wireless networks,” Submitted. NEW 

The following paper was accepted in QEST2020. M. A. Yazici, T. PhungDuc, M/M/1 Vacation Queue with Multiple Thresholds: A Fluid Analysis, to be presented at QEST2020 and to appear in Lecture Notes in Computer Science. NEW 

We submitted the following paper to a conference. *Nakamura, A., PhungDuc, T. and Ando, H. (2020), “A Stochastic Model for Car/RideShare Service by a Bus Company,” Submitted. NEW 

We submitted the following paper to a conference． Nazarov, A., PhungDuc, T. and Izmailova, Y. (2020), “Gaussian asymptotics for a multiclass M/M/1 retrial queueing system,” Submitted. NEW 

We submitted the following paper to a conference． M. A. Yazici, T. PhungDuc, M/M/1 Vacation Queue with Multiple Thresholds: A Fluid Analysis. NEW 

We editted the following special issue． PhungDuc, T., Takahashi, Y. and Takagi, H. Eds., Special Issue of Annals of Operations Research on Queueing theory and network applications II, 2020. [DOI: 10.1007/s10479020036184] NEW 

Tuan PhungDuc joined the Panel Session: Analysis on Stochastic Service Systems with Strategic
Service Providers and Customers of 2020 IEEE 7th International Conference on Industrial Engineering and Applications (ICIEA 2020) as an invited panelist and gave an invited talk entitled Queueing Analysis of Autoscaling Systems. NEW 

Three new members: Nguyen Quoc Hung (Doctoral course), Zhuangling Luo (Master course) Tianqi Zhao (Master course) joined our lab. Congratulations!!!NEW 

Moeko Yajima became an assistant professor of Tokyo Institute of Technology. Congratulations!!!NEW 

Kohei Akutsu and Shinto Hideyama graduated and started their new careers. Congratulations!!!NEW 

Kohei Akutsu (M2) received department chair's award，Ayane Nakamura (B4) received the Kuratani Award and the University of Tsukuba's President Award！Congratulations!!!NEW 

Shinto Hideyama and Kohei Akutsu received Master Degree; Ayane Nakamura and Yoshito Machida received Batchelor Degree. Congratulations!NEW 

Tuan PhungDuc editted his forth book．NEW Gribaudo, M., Iacono, M., PhungDuc, T., Razumchik, R. (Eds.): Computer Performance Engineering: 16th European Workshop, EPEW 2019, Milan, Italy, November 28–29, 2019, Revised Selected Papers (Lecture Notes in Computer Science). 

We submitted two papers to a journal. NEW *Nakamura, A., PhungDuc, T. and Ando, H. (2020), “Queueing Analysis of a Car/RideShare System,” Submitted. PhungDuc, T., *Akutsu, K., Kawanishi, K., Salameh, O. and Wittevrongel, S. (2020), “Queueing models for cognitive wireless networks with sensing time of secondary users,” Submitted. 

The following paper was accepted by ASMTA2019 and to appear in Lecture Notes in Computer Science.
PhungDuc, T. and Fiems, D. (2019), “Exact Performance Analysis of Retrial Queues with Collisions,” Accepted in ASMTA2019 and to appear in Lecture Notes in Computer Science. NEW 

The following paper was accepted by ASMTA2019 and to appear in Lecture Notes in Computer Science.
Ayane Nakamura, Tuan PhungDuc and Hiroyasu Ando, “Queueing Analysis for a mixed model of carsharing and ridesharing,” Accepted in ASMTA2019. NEW 

The following paper was accepted by ASMTA2019 and to appear in Lecture Notes in Computer Science.
Velika Dragieva and Tuan PhungDuc, “Queueing Analysis of Cognitive Radio Networks with Finite Number of Secondary Users,” Accepted in ASMTA2019. NEW 

4th Year Batchelor Student Ayane Nakamura gave the following presentation.
Ayane Nakamura, Tuan PhungDuc, Hiroyasu Ando, “Mixed Model for Carsharing and RideSharing,” The 2019 Fall National Conference of Operations Research Society of Japan. NEW 

Yutaka Sakuma, Tuan PhungDuc and Onno Boxma received the Best Paper Award at QTNA2019 for the following paper.
Sakuma, Y., Boxma, O. and PhungDuc, T. (2019), “A single server queue with workloaddependent service speed and vacations,” QTNA2019. NEW 

Master Student Shinto Hideyama gave the following presentation at QTNA2019.
*Hideyama, S., PhungDuc, T. and Okada, Y., “Queueing Analysis of Home Delivery Services with Parcel Lockers,” QTNA2019. NEW 

Master Student of Second Year Kohei Akutsu gave the following presentation at QTNA2019.
*Akutsu, K., PhungDuc, T. (2019), “Analysis of Retrial Queues for Cognitive Wireless Networks with Sensing Time of Secondary Users,” QTNA2019. NEW 

The paper: Dragieva, V. I. and PhungDuc, T., “A FiniteSource M/G/1 Retrial Queue with Outgoing Calls,” was accepted in Annals of Operations Research. NEW  
The paper: *Makino, Y. and PhungDuc, T. (2019), “Queueing Analysis of Taxi Stand Considering Boarding Time,” was accepted by NOLTA2019. NEW  
Prof. Tuan PhungDuc became an associate editor of Journal of the Operations Research Society of Japan． NEW  
Prof. Tuan PhungDuc is serving as TPC CoChair of 16th European Performance Engineering Workshop (EPEW2019)． NEW  
Prof. Tuan PhungDuc is serving as General Chair of 13th EAI International Conference on Performance Evaluation Methodologies and Tools (Valuetools2020)． NEW  
Prof. Moshe Haviv visits us and delivers a series of intensive lectures on Economics of Queues. Further, he will give a talk entitled ``Social cost of deviation in noncooperative games". NEW  
Master Student Kohe Akutsu received the travel grant from The International Information Science Foundation. NEW  
Prof. YingDar Lin visited us and gave the talk entitled "5G Mobile Edge Computing: Research Roadmap of H2020 5GCoral Project" NEW  
The paper: PhungDuc, T. and Kawanishi, K., “Delay Performance of DataCenter Queue with Setup Policy and Abandonment,” was accepted by Annals of Operations Research. NEW  
Three papers of our group were accepted by QTNA2019 and to appear in Lecture Notes in Computer Science. Sakuma, Y., Boxma, O. and PhungDuc, T. (2019), “A single server queue with workloaddependent service speed and vacations,” Accepted by QTNA2019. To appear in Lecture Notes in Computer Science. *Hideyama, S., PhungDuc, T. and Okada, Y. (2019), “Queueing Analysis of Home Delivery Services with Parcel Lockers,” Accepted by QTNA2019. To appear in Lecture Notes in Computer Science. *Akutsu, K., PhungDuc, T. (2019), “Analysis of Retrial Queues for Cognitive Wireless Networks with Sensing Time of Secondary Users,” Accepted by QTNA2019. To appear in Lecture Notes in Computer Science. NEW 

We opened our website. NEW 