Dr Vasilios Kelefouras

Dr Vasilios Kelefouras

Lecturer in Computer Science

School of Engineering, Computing and Mathematics (Faculty of Science and Engineering)

   Dr Vasilios Kelefouras joined the Department of Computing at University of Plymouth in Sept. 2018. His research expertise lies in the field of optimizing compilers, code optimization, High Performance Computing, data transfer optimization, static task scheduling and embedded systems.
  He received his Master diploma “Integrated Software and Hardware Systems” of Computer Engineering and Informatics Department of University of Patras in 2008; he graduated with distinction and he earned the 1st Fellowship award. In 2013, he received his PhD from the department of Electrical and Computer Engineering at University of Patras; he composed and won the Greek PhD Research Scholarship. From Sept. 2013 until Dec 2016 he had been working as a postdoctoral researcher at VLSI lab at Dept. of Electrical and Computer Engineering, University of Patras. Additionally, from Oct. 2015 until Dec. 2016, he had been working as a postdoctoral researcher at Embedded System Design and Application Lab of Technological Educational Institute of Western Greece. From Jan. 2017 until Dec. 2017 he was a Research Fellow at Distributed Systems and Services Research Group, School of Computing, University of Leeds (UK). Last, from Dec. 2017 until Sept. 2018 he had been working as a Lecturer at Sheffield Hallam University.

Teaching interests

I am the module leader of

  • Embedded Programming and the Internet of Things (SOFT261)
  • Computer Systems and Networks (NET112)
  • Computer Architecture and Low Level Programming (SEC204)

In the past I have also taught :

  • Computer Science Workshop (AINT514)
  • Computational Problem Solving and Computer Systems (ISAD515)

Research interests

  My research area lies in the field of optimizing compilers, loop transformations, High Performance Computing, static task scheduling and embedded systems. 
  The last 11 years I have carried out high quality research in several European and Greek research projects and published 28 research papers in high quality journals and conferences, such as IEEE/ACM transactions and HiPEAC. I have gained strong R&D experience in optimizing software (SW) applications, in terms of execution time, energy consumption and memory size, in a wide range of different hardware (HW) platforms, i.e., single/multi-core CPUs, microcontrollers, hard/soft processors on FPGAs, GPGPUs, clusters; moreover, I have some experience in developing optimized HW-SW co-design solutions and high throughput / low area HW solutions on FPGAs.

Publications in international Journals


J18. Vasilios Kelefouras, Karim Djemame, "A methodology correlating code optimizations with data memory accesses, execution time and energy consumption", accepted for publication in journal of Supercomputing (Springer) (IF: 1.532)


J17. V.I. Kelefouras, Keramidas Georgios, Voros Nikolaos, "Combining software cache partitioning and loop tiling for effective shared cache management", ACM Transactions on Embedded Computing Systems (TECS) (IF: 1.367)


J16. V.I. Kelefouras, “A methodology pruning the search space of six compiler transformations by addressing them together as one problem and by exploiting the hardware architecture details", Journal of Computing, Springer (IF: 0.872)


J15. V.I. Kelefouras, A. Kritikakou, I. Mporas and V. Kolonias, “A high performance Matrix-Matrix Multiplication methodology for CPU and GPU architectures”, Journal of Supercomputing, Springer (IF: 1.088)

J14. A.Kritikakou, F. Catthoor, V. Kelefouras and C. Goutis, “Array Size Computation under Uniform Overlapping & Irregular Accesses” ACM Transactions on Design Automation of Electronic Systems (TODAES) (IF: 0.52)


J 13. V.I. Kelefouras, Elissavet Papadima, A. S. Kritikakou and C.E. Goutis, «A Matrix Vector Multiplication Methodology for single/multi-core architectures», Journal of Supercomputing, Springer (IF: 1.088)

J12. V.I. Kelefouras, A.Kritikakou and C. Goutis, « A methodology of speeding up loop kernels by exploiting the software information and the memory architecture», Journal of Computer Languages, Systems & Structures (COMLAN), Elsevier, 2015 (IF: 0.458)

J11. H.E. Michail, G.S. Athanasiou, V.I. Kelefouras, G. Theodoridis, T. Stouraitis, C.E. Goutis, “Area-Throughput trade-offs for SHA-1 and SHA-256 Hash Functions' Pipelined Designs” Journal of Circuits, Systems, and Computers (IF: 0.25)


J10. V.I. Kelefouras, A. Kritikakou and C. Goutis «A Matrix Matrix Multiplication Methodology for Single/Multi-core architectures using SIMD», Journal of Supercomputing, Springer, Vol. 68, No. 3, pp. 1418-1440, Jan., 2014 (IF: 0.917)

J9. V.I. Kelefouras, A. Kritikakou and C. Goutis «A Methodology for Speeding Up Edge and Line Detection Algorithms focusing on Memory Architecture Utilization», Journal of Supercomputing, Springer, Vol. 68, No. 1, pp. 459-487, 2014, DOI:10.1007/s11227-013-1049-x, (IF: 0.917)

J8. A.Kritikakou, F. Catthoor, V.I. Kelefouras and C. Goutis, «A scalable and near-optimal representation of access schemes for memory management», ACM Transactions on Architecture and code Optimization (TACO), Vol. 11, No.1, Feb., 2014 (IF: 0.824)


J7. A.Kritikakou, F. Catthoor, V.I. Kelefouras and C. Goutis, «Near-optimal & Scalable Intra-signal In-place for Non-overlapping & Irregular Access Schemes», ACM Transactions on Design Automation of Electronic Systems, Vol.19, no. 1, Dec., 2013, DOI:10.1145/2534383 (IF: 0.685)

J6. V.I. Kelefouras, A.Kritikakou, Konstantinos Siourounis and C. Goutis, “A methodology for speeding up MVM for Regular, Toeplitz and Bisymmetric Toeplitz Matrices”, Journal of Signal Processing Systems, Springer, Vol. 77, No. 3, pp. 1-15 , 2013, DOI:10.1007/s11265-013-0812-9 (IF: 0.551)

J5. A.Kritikakou, F. Catthoor, G.S. Athanasiou, V.I. Kelefouras and C. Goutis, “Near-optimal Microprocessor & Accelerators Co-Design with Latency & Throughput Constraints”, ACM Transactions on Architecture and Code Optimization (TACO), May, Vol. 10, No. 2, 2013, DOI:10.1145/2459316.2459317 (IF: 0.824)

J4. A.Kritikakou, F. Catthoor, V.I. Kelefouras and C. Goutis, “A systematic approach to classify design-time global scheduling techniques”, Journal of ACM Computed Surveys, Vol. 45, No. 2, Feb. 2013, DOI: 10.1145/2431211.2431213 (IF: 9.169)


J3. N. Alachiotis, V.I. Kelefouras, G. Athanasiou, H. Michail, A. Kritikakou and C. Goutis, “A Data Locality Methodology for Matrix-Matrix Multiplication Algorithm”, Journal of Supercomputing, Springer, 2012, Vol. 59, No. 2, pp. 830--851, DOI: 10.1007/s11227-010-0474-3 (IF:0.917)

J2. H.E. Michail, G.S. Athanasiou, V.I. Kelefouras, G. Theodoridis, C.E. Goutis, “On the exploitation of a high-throughput SHA-256 FPGA design for HMAC”, accepted for publishing in journal of ACM Transactions on Reconfigurable Technology and Systems (TRETS), vol. 5, Iss. 1, March 2012.

J1. V.I. Kelefouras, G.S. Athanasiou, N. Alachiotis, H. E. Michail, A. S. Kritikakou and C.E. Goutis, “A Methodology for Speeding Up Fast Fourier Transform Focusing on Memory Architecture Utilization”, IEEE Transactions on Signal Processing, 2011, Vol.59, No 12, pp.6217-6226, DOI:10.1109/TSP.2011.2168525 (IF:2.829)

Publications in international Conferences


C9. V.I. Kelefouras, Karim Djemame “Workflow Simulation Aware and Multi-Threading Effective Task Scheduling for Heterogeneous Computing”, 25th IEEE International Conference on High Performance Computing, Data, and Analytics (HiPC 18)

C8. V.I. Kelefouras, K. Djemame “A methodology for efficient code optimizations and memory management”, ACM International Conference on Computing Frontiers 2018 (CF '18), Ischia, Italy 


C7. V.I. Kelefouras, Keramidas Georgios, Voros Nikolaos “Cache partitioning + loop tiling: A methodology for effective shared cache management”, IEEE Computer Society Annual Symposium on VLSI, July 3-5, 2017, Bochum, Germany


C6. B A.Emeretlis, V. Kelefouras, G. Theodoridis, , M. Nanou, C.(T.) Politi, K. Georgoulakis, and G.O. Glentis, “FPGA IMPLEMENTATION OF A MIMO DFE IN 40 GB/S DQPSK OPTICAL LINKS”, EUSIPCO 2015, NICE, FRANCE.

C5. A.Kritikakou, F. Catthoor, V.I. Kelefouras and C. Goutis, «Near-optimal & Scalable Representation of Access Schemes for Memory Management», Presentation at the Conference of European Network of Excellence on High Performance and Embedded Architecture and Compilation (HiPEAC), Amsterdam, The Netherlands, Jan., 2015


C4. Andreas Emeretlis, V. I. Kelefouras, George Theodoridis, George - Othon Glentis, “EFFICIENT FPGA IMPLEMENTATIONS OF VOLTERRA DFES FOR OPTICAL SYSTEMS”, 2014 IEEE Dallas Circuits and Systems Conference (DCAS), Oct 12-13, 2014


C3. Kritikakou, F.Catthoor, G.S. Athanasiou, V.I. Kelefouras and C. Goutis, “A Template-based Methodology for Efficient Microprocessor and FPGA Accelerator Co-Design”, Proc. Int’l Conf. Embedded Computer Systems: Architectures, Modeling and Simulation (SAMOS), Samos, Greece, 16-19 July 2012


C2. H.E. Michail, V.I. Kelefouras, D. Panagianopoulou, A. Gregoriades, A. Kotsiolis, C.E. Goutis, “HW/SW co-Design Integrating High – Speed Authentication Module for IPSec/IPv6”, Oral Presentation in the fifth International Conference on Digital Telecommunications (ICDT 2010), Athens/Glyfada Greece, 13-19 June 2010 

C1.  H.E. Michail, D.A. Apostolopoulou, L.A. Anastasiou, V.K. Porpodas, G.S. Athanasiou, V.I. Kelefouras and C.E. Goutis, “Novel Hardware Implementation of the Cipher Message Authentication Code (CMAC)”, Oral Presentation in 1st Panhellenic Conference on Electronics and Telecommunications (PACET '08), Patras, Greece, 20-22 March

Book Chapters

B1. K. Djemame, R. Kavanagh, V. Kelefouras, A. Aguila, J. Ejarque, R.M. Badia, D. Garcia Perez, C. Pezuela, J-C. Deprez, L. Guedria, R. De Landtsheer and Y. Georgiou, “Towards an Energy-aware Framework for application development and execution in Heterogeneous parallel architectures” In: Accelerators for energy efficient data centers, C. Kachris (Ed.), 2018, pp. 175-196.

B2. H.E. Michail, A.Gregoriades, G.S. Athanasiou, V.I. Kelefouras and C.E. Goutis, “Authentication with RIPEMD-160 and other alternatives: A Hardware Design Perspective”, accepted for publishing in the book "Advanced Technologies", ISBN 978-953-7619-X-X, 2010