Research

Courses
Research Interests   Publications   White Papers
  Projects Conferences Works in Progress
Papers under review

Research Interests

1.  Supply Chain Modelling
(a) Facility Location and sizing
(b) Warehousing
(c) Buyer-Supplier Relationships

2.  Applied Stochastic Processes
(a)   Production Inventory Control
(b)  Queueing Theory : Transient Solutions
(c)  Reliability
(d)  Compartmental Modelling
 

 

Research Publications

1. M. Goh and M. Sharafali, Price-dependent inventory model with discount offers at random times,  To appear in Production and Operations Management (Accepted in June 2001).
2. Chen, F., M. Goh, J. Lee, J.H. Ou, M. Sharafali, C. P. Teo, P. G. Goh and S. Pragash, ST Logistics: Distributing consumer goods in China, International Transactions in Operational Research, Vol. 8, No. 2, 203-219 (2001).
3. Co, H.C., M. Sharafali and M. Goh, Scheduling part families under FMS: To mix or not to mix?, International Transactions in Operational Research, Vol. 8, No. 2, 139-153 (2001).
4. Sharafali, M. and H. C. Co,  Some models for understanding the cooperation between the buyer and the seller, International Journal of Production Research, Vol. 38, No. 15, 3425-3449 (2000).
5.

Co, H.C. and M. Sharafali, Overplanning factor in Toyota's formula for computing the number of kanban,  IIE Transactions, Vol. 29, No. 5, 409-415 (1997).
6. Agrafiotis G.K.,  M. Sharafali and P.R. Parthasarathy, On the total overtime service in some loss queueing systems, Journal of Applied Statistical Science, Vol. 5, No. 1, 27-37 (1996).
7. Parthasarathy P.R.,  B. Krishnakumar and M. Sharafali, Transient  solution of an M/M/1 queue with balking, Queueing Systems: Theory and Applications,  Vol. 13, No. 4, 441-448 (1993).
8. Sharafali, M., R. Natarajan and P.R. Parthasarathy, An intermittently used two-unit system with semi-Markov need process,  Mathematical and Computer Modelling, Vol. 17, No. 6, 83-90(1993).
9. Parthasarathy P.R.,  B. Krishnakumar and M. Sharafali, Density dependent birth and death processes with controlled immigration, Stochastic Analysis and Applications, Vol. 11, No. 2, 181-196(1993).
10. Parthasarathy, P.R. and M. Sharafali, Age-dependent  branching  process  with birth process immigration , International  Journal for Mathematical Education  in Science and , Vol. 22, No. 2, 317-320 (1991).
11. Parthasarathy, P.R. and M. Sharafali, A queue with birth process arrival and state-dependent service, International Journal of Modelling and Simulation, Vol. 10, No. 1, 13-16 (1990).  
12. Agrafiotis, G.K.,   P.R. Parthasarathy and M. Sharafali, Excess repair time for a repairable system, Microelectronics and Reliability, Vol. 30, No. 3, 507-510 (1990).
13. Sharafali, M. and Parthasarathy, P.R., On the distribution of a busy period for the many server Poisson queue, Opsearch, Vol. 26, No. 2, 125-132 (1989).
14. Parthasarathy, P.R. and M. Sharafali, Transient solution to the many server Poisson queue: A simple approach, Journal of Applied Probability, Vol. 26, 584-594 (1989).
15. Parthasarathy, P.R. and M. Sharafali, The total sojourn time distribution in a stochastic compartmental model, Mathematical and Computer Modelling, Vol. 12, No. 9, 1167-1173 (1989).
16. Sharafali, M., R. Natarajan and P.R. Parthasarathy, A complex two-unit system with stochastic demand, Microelectronics and Reliability, Vol. 28, No. 3, 359-361(1988).
17. Parthasarathy, P.R. and M. Sharafali, On the unutilised capacity in a production-storage system, Operations Research Letters, Vol. 6, No. 5, 233-238(1987).
18. Sharafali, M., On a continuous review  production-inventory problem, Operations Research Letters, Vol. 3, No. 4, 199-204 (1984).
19. Parthasarathy, P.R. and M. Sharafali, Some  notes  on  the  total service time in certain loss systems, Journal of Applied Probability, Vol. 21, No. 3, 616-627 (1984).
 

 

White Papers
1.  E. Barnes, J. Dai, D. Shijie, D. Down, M. Goh  H. C. Lau and M. Sharafali, 2000, On the strategic use of supply hubs for cost reduction and responsiveness, The Logistics Institute-Asia Pacific, National University of Singapore.
2. E. Barnes, J. Dai, D. Shijie, D. Down, M. Goh  H. C. Lau and M. Sharafali, 2000, Electronics manufacturing service industry, The Logistics Institute-Asia Pacific, National University of Singapore.
 

 

Papers under review
1. Hum, S.H., M. Sharafali and C. P. Teo,   2000, Staggering Periodic Replenishment in Multi-vendor JIT environments.
2. Parlar, M.,  M. Sharafali and J. H. Ou, 2001, Optimal positioning of idle elevators under myopic and state-dependent policies.
3. Sharafali, M. H. C. Co and M. Goh, 2001, Production scheduling in a flexible manufacturing system under random demand.
4. Ou, J.H., M. Parlar and M. Sharafali, 2001, A differentiated service scheme to optimze website performance.
 

 

Conference/Seminar Presentations
1. Chen, F., M. Goh, J. Lee, J.H. Ou, M. Sharafali, C.P. Teo, P.G. Goh and S. Pragash, ST Logistics: Distributing consumer goods in China - IFORS conference, Beijing, China.  August 1999.
2. Co H. C., M. Sharafali and M. Goh, A note on scheduling part families in FMS: Is it always good to operate the FMS as a job shop?  � IFORS conference, Beijing, China. August 1999.
3. Spoke about an Industry Application in the Public Seminar entitled �Managing and Leveraging Logistics and Supply Chain Management in the 21st century� organized by the Dept. of Decision Sciences, Faculty of Business Administration, National University of Singapore on 6th August 1999.
4. Co H. C. and M. Sharafali, The impact of mean flow time when operating a flexible manufacturing system as a programmable transfer line � PICMET '99, Technology and Innovation Management, Portland, Oregon, U.S.A. July 25-29, 1999.
5. Sharafali, M. and M. Goh, A sales inventory model for demand management - INFORMS International, Seattle, U.S.A. Oct 25-28, 1998.
6. Sharafali, M. and H. C. Co, Coping with uncertainty in kanban-controlled production systems  - INFORMS International,Suntec city, Singapore.June 25-28, 1995.
7. Co H. C., M. Sharafali and E. Patuwo, An Inquiry into the buffering of planned order requirements in MRP. - TIMS/ORSA Joint National Meeting at the Boston Marriott Copley Place. April 24-27 1994.
8. Sharafali, M. and P. R. Parthasarathy, A novel approach to the transient solution to M/M/c queue � National Conference on Queues, Inventories and Reliability, Cochin University of Science and Technology, India, July 1989.
9. Participated in the III Autumn Course on Mathematical Ecology, International Center for Theoretical Physics, Trieste, Italy. Oct. 29, 1990 to Nov. 16, 1990.
10. Participated in Winter School on Reliability Engineering, Indian Institute of Technology, Bombay. Dec. 1984.
 

 

Works in Progress
1.

Dai, J., M. Sharafali and M. Goh, Service level based supply chain management.

1. Liu, Q. Z., J. Sun,  C. P. Teo and M. Sharafali, Optimizing E-Supply Chain management.
3. Sharafali, M. and M. Goh, Analytics of Supply Hub practices and models.
 

 

Participation in Projects with financial support
1. White paper project on Supply Chain Issues in Electronics Industries, TLI-AP, National University of Singapore.  This was in collaboration with The Logistics Institute, Georgia Institute of Technology, Atlanta.
2. Played a major role with C. P. Teo and others, in a study on optimizing the China distribution operations of SembCorp Logistics, Singapore and in the the development of the associated software. 
3. Participated in a research project (with M. Goh as Principal Investigator) entitled "An analysis of logistics systems and networks in the ASEAN Region''.