Study of influences of negative arrival for single server retrial queueing system with Coxian phase type service. - Ayyappan Govindan; Muthu Ganapathi Subramanian; Gopal Sekar (QTNA, 2011)

Stability analysis of single server retrial queueing system with Erlang service. - Gopal Sekar; Ayyappan Govindan; Muthu Ganapathi Subramanian (QTNA, 2011)

Study of multi server retrial queueing system under vacation policies by direct truncation method. - Muthu Ganapathi Subramanian; Ayyappan Govindan; Gopal Sekar (QTNA, 2011)

Analysis of batch arrival bulk service queue with additional optional service multiple vacation and setup time. - G. Ayyappan; T. Deepa (Int. J. Math. Oper. Res., 2019)

An M[X]/G(a, b)/1 queueing system with server breakdown and repair, stand-by server and single vacation. - G. Ayyappan; S. Karpagam (Int. J. Math. Oper. Res., 2019)

Analysis of bulk queue with unreliable service station, second optional repair, N-policy multiple vacation, loss and immediate feedback in production system. - G. Ayyappan; M. Nirmala 004 (Int. J. Comput. Sci. Math., 2020)

Analysis of a bulk service queue with unreliable server, multiple vacation, overloading and stand-by server. - G. Ayyappan; S. Karpagam (Int. J. Math. Oper. Res., 2020)

An M[X]/G(a, b)/1 queue with unreliable server, second optional service, closedown, setup with N-policy and multiple vacation. - G. Ayyappan; M. Nirmala 004 (Int. J. Math. Oper. Res., 2020)

Analysis of non-pre-emptive priority retrial queueing system with two-way communication, Bernoulli vacation, collisions, working breakdown, immediate feedback and reneging. - G. Ayyappan; J. Udayageetha; B. Somasundaram (Int. J. Math. Oper. Res., 2020)

Machine learning analysis of queues with MAP, Reneging, Phase Type services, vacations and repairs. - G. Ayyappan; K. Thilagavathy (DSMLAI, 2021)

Analysis of MAP/PH/1 queueing model with immediate feedback, starting failures, single vacation, standby server, delayed repair, breakdown and impatient customers. - G. Ayyappan; K. Thilagavathy (Int. J. Math. Oper. Res., 2021)

Analysis of MAP, PH2OA/PH1I, PH2O/1 retrial queue with vacation, feedback, two-way communication and impatient customers. - G. Ayyappan; R. Gowthami (Soft Comput., 2021)

A MAP/PH1, PH2/1 system with two types of heterogeneous service, setup, closedown, vacation, immediate feedback, breakdown and repair. - G. Ayyappan; R. Gowthami (Int. J. Math. Oper. Res., 2022)

Analysis of MAP1I, PH2O/PH1I, PH2O/1 retrial queue with two-way communication, optional service, single vacation, closedown, setup and balking. - G. Ayyappan; G. Archana Alias Gurulakshmi; B. Somasundaram (Int. J. Math. Oper. Res., 2022)

Analysis of MAP/PH1E, PH2O/1 queue with standby server, second optional service, variant arrival rate, Bernoulli schedule vacation, impatient behaviour of customers, breakdown, essential and optional repair. - G. Ayyappan; K. Thilagavathy (Int. J. Math. Oper. Res., 2022)

Analysis of MAP/PH/1 queueing system with catastrophic delay action, standby server, balking, working vacation and vacation interruption under N-policy. - G. Ayyappan; K. Thilagavathy (Int. J. Math. Model. Numer. Optimisation, 2023)

Detection for melanoma skin cancer through ACCF, BPPF, and CLF techniques with machine learning approach. - P. Kavitha; G. Ayyappan; Prabhu Jayagopal; Sandeep Kumar Mathivanan 001; Saurav Mallik; Amal Al-Rasheed; Mohammed S. Alqahtani; Ben Othman Soufiene (BMC Bioinform., 2023)

Analysis of MAP/PH/1 queue with differentiated vacation, vacation interruption under N-policy, optional service, breakdown, repair, setup and discouragement of customers. - G. Ayyappan; G. Archana Alias Gurulakshmi (Int. J. Math. Oper. Res., 2024)

Analysis of MAP/PH/1 queueing system with discarding customers having imperfect service, single vacation, feedback and impatient customers. - G. Ayyappan; G. Archana Alias Gurulakshmi (Int. J. Math. Oper. Res., 2024)

Analysis of M[X1], M[X2]/G1, G2/1 retrial queue with priority services, differentiate breakdown, delayed repair, Bernoulli feedback, balking and working vacation. - G. Ayyappan; S. Nithya (Int. J. Math. Oper. Res., 2024)

Achieving optimal resources utilisation in industrial environments: combining polling methods and an exhaustive service discipline with an unreliable service. - G. Ayyappan; S. Sankeetha (Int. J. Math. Oper. Res., 2024)

Analysis of MAP/PH/1 retrial queueing system with two-stage vacations with imperfect service, N-policy service, delayed feedback, unreliable server and discouragement customer. - G. Ayyappan; N. Arulmozhi (Int. J. Math. Oper. Res., 2025)

A two-server tandem queueing model with Markovian arrival process, phase type service, working vacation, feedback, re-service, unreliable server, interrupted closedown and customers intolerance. - G. Ayyappan; G. Archana Alias Gurulakshmi (Int. J. Math. Oper. Res., 2025)

Analysis of batch arrival bulk service priority queue with multiple vacation, close down, setup, differentiate breakdown, and repair. - G. Ayyappan; S. Nithya (Int. J. Math. Oper. Res., 2025)

Analysis of non-Markovian batch arrival retrial queue with priority services, vacation and vacation interruption under random environment, negative arrival, immediate feedback, differentiate breakdown, and repair. - G. Ayyappan; S. Nithya (Int. J. Math. Oper. Res., 2025)

Integrated management and optimisation of vaccination and treatment processes in a batching system with observation and limited space. - G. Ayyappan; S. Sankeetha (Int. J. Math. Oper. Res., 2025)

Cost optimisation of MMAP/PH(1), PH(2)/1 pre-emptive priority retrial queueing model with standby server, orbital search, server breakdowns, phase type repairs and impatient customers. - G. Ayyappan; K. Thilagavathy; Rakesh Kumar (Int. J. Math. Oper. Res., 2025)