Profile-Dr Samuel Gyamfi

Brief Profile

Prof. Samuel Gyamfi is an expert in the Energy Efficiency and Renewable Energy Sector with a wealth of experience from over 15 years of practice. His main area of interest is in Utility Demand Side Management but he also has interest and experience in Electricity Demand Response Assessment and Modelling, Energy Economics and Policy, Renewable and Sustainable Energy for Developing Countries and Energy Life Cycle Assessment.

He is a member of Engineers Australia and International Solar Energy Society. He is currently a Senior Lecturer at the University of Energy and Natural Resources.

Courses Taught at the Graduate Level

  • SEMA 502: Energy Efficiency and Management
  • SEMA 536: Energy Storage and Conversion System 
Institution (Start – End dates)Degree(s)/Diploma(s) /Certificates obtained
University of Canterbury, New Zealand; 2006 – 2010PhD (Mechanical Engineering -Energy Systems)
University of Applied Sciences, Aachen, Germany; 2002-2004MSc (Energy Systems)
Kwame Nkrumah University of Science and Technology; 1997 – 2001BSc Geodetic Engineering
European Safeguards Research and Development Association (ESARDA), JCR-European Commission, Ispra, Italy; 2008Nuclear Safeguards and Non-Proliferation

Research Activities / Interests

My main research interest is in utility demand side management and the way that human factors can be used to develop technology and communication systems to improve energy efficiency behaviour. I have experience and interests in several related areas.

  • Energy Efficiency and Demand-side Management
  • Energy Economics and Policy
  • Renewable and Sustainable Energy for Developing Countries
  • Energy Life Cycle Assessment

COUNTRIES WITH PROFESSIONAL EXPERIENCE

RESIDENTSNON-RESIDENT
New Zealand (4 years)Niger
Australia (4 years)Algeria
Germany (6 years)South Africa
  

Curriculum Vitae

Professor Samuel Gyamfi CV

PhD Thesis Supervised

 

  1. Ayuketah Yvan Jose Agbor (2023) Evaluating Sustainable Energy Pathways for Cameroon: A Long-Term Approach

  2. IWEH, Chu Donatus (2023) Integration of Distributed Solar Photovoltaic Energy System into the Electric Grid: Options for Sustainable Electricity Supply in Cameroon

  3. Forson Peprah (2023) Techno-Economic and Policy (TEP) Analysis of Electricity Prosumption in Ghana: Implications for Sustainable Electricity Development

  4. Bernard Aboagye (2021) Technical Performance Audit of Installed Solar Photovoltaic Systems in Different Climatic Zones in Ghana

  5. Martin Kyereh Domfeh (2020) Numerical Simulation of Free Surface Vortices at Single and Multiple Intakes using Openfoam.

 

Publications

  1. Lartey, D. H., Gyamfi S., Velenderic M., Appiah O., (2024) Assessment of PV excess generation savings in Ghana considering peer-to-peer energy trading. Energy Sources Part B-Economics Planning and Policy (2024). https://doi.org/10.1080/15567249.2024.2372830
  2. Djimasbe, R., Gyamfi, S., Iweh, C. D., & Ribar, B. N. (2024). Development of an ARIMAX model for forecasting airport electricity consumption in Accra-Ghana: The role of weather and air passenger traffic. e-Prime – Advances in Electrical Engineering, Electronics and Energy 9 (2024) 100691.  https://doi.org/10.1016/j.prime.2024.100691.   
  3. Asante, K., Gyamfi, S., Amo-Boateng, M., & Peprah, F. (2024). Techno-economic analysis of solar PV electricity generation at Ghana’s University of Environment and Sustainable Development. Energy Reports 11 (2024) 659–673. https://doi.org/10.1016/j.egyr.2023.12.028.
  4. Gyamfi, S., Aboagye, B., Obeng, M., & Peprah, F. (2024). Criticality and Severity of Adverse Effects of the Sun on Performance of Solar PV Systems. Solar Energy Advances 4 (2024) 100058. https://doi.org/10.1016/j.seja.2024.100058.
  5. Iweh, C. D., Gyamfi, S., Effah-Donyina, E., & Tanyi, E. (2024). Analysis of contingency scenarios towards a suitable transmission pathway in the southern interconnected grid (SIG) of Cameroon. e-Prime – Advances in Electrical Engineering, Electronics and Energy 7 (2024) 100486. https://doi.org/10.1016/j.prime.2024.100486.
  6. Ahialey, E. K., Kabo–bah, A. T., & Gyamfi, S. (2024). LULC changes in the region of the proposed Pwalugu hydropower project using GIS and remote sensing technique. Journal of Geography and Cartography 2024, 7(2), 8282. https://doi.org/10.24294/jgc.v7i2.8282.
  7. Iweh C.D., Gyamfi S., Effah-Donyina E., Tanyi E., (2024) Analysis of contingency scenarios towards a suitable transmission pathway in the southern interconnected grid (SIG) of Cameroon e-Prime – Advances in Electrical Engineering, Electronics and Energy 7 (2024) 100486. https://doi.org/10.1016/j.prime.2024.100486 and Energy 7 (2024) 100486. https://doi.org/10.1016/j.prime.2024.100486
  8. Avordeh T. K., Gyamfi S. (2024) Optimizing residential demand response in Ghana through iterative techniques and home appliance trend analysis. Heliyon 10 (2024) e25807. https://doi.org/10.1016/j.heliyon.2024.e25807.
  9. Asante K., Gyamfi S., Amo-Boateng M., Peprah F., (2023) Techno-economic analysis of solar PV electricity generation at the University of Environment and Sustainable Development in Ghana. Energy Reports 11(2024) 659 – 673 June 2024, Pages 659-673 https://doi.org/10.1016/j.egyr.2023.12.028
  10. Nyasapoh M. A, Gyamfi S, Debrah S. K., Gaber A. H., Derkyi N. A. A (2023) Evaluating the Effectiveness of Clean Energy Technologies (Renewables and Nuclear) and External Support for Climate Change Mitigation in Ghana2023 IEEE the 11th International Conference on Smart Energy Grid Engineering
  11. Ahialey K. E., Kabo–Bah, T. A., Gyamfi S. (2023) Impacts of LULC and climate changes on hydropower generation and development: A systematic review. Heliyon 9 (2023) e21247. https://doi.org/10.1016/j.heliyon.2023.e21247
  12. Abdulai D., Gyamfi S., Diawuo F. A., Acheampong P. (2023)Data analytics for prediction of solar PV power generation and system performance : A real case of Bui Solar Generating Station, Ghana Scientific African 21 https://doi.org/10.1016/j.sciaf.2023.e01894
  13. Ajiboye O. K., Ochiegbu C. V. Ofosu, A. E., Gyamfi, S. (2023) A review of hybrid renewable energies optimization: design, methodologies, and criteria. International Journal of Sustainable Energy 2023, VOL. 42, NO. 1, 648–684 https://doi.org/10.1080/14786451.2023.2227294
  14. Ajiboye O. K., Ofosu, A. E., Gyamfi, S. Oki O. (2023) Hybrid Renewable Energy System Optimization via Slime Mould Algorithm. International Journal of Engineering Trends and Technology. Vol. 71 Issue 6, 83-95, June 2023 https://doi.org/10.14445/22315381/IJETT-V71I6P210
  15. Gyamfi S., Aboagye B., Peprah F., Obeng M. (2023) Degradation analysis of polycrystalline silicon modules from different manufacturers under the same climatic conditions. Energy Conversion and Management: X 20 (2023) 100403 https://doi.org/10.1016/j.ecmx.2023.100403
  16. Ayuketah I, Gyamfi S., Diawuo F. A, Dagoumas A.S. (2023) A techno-economic and environmental assessment of a low-carbon power generation system in Cameroon. Energy Policy 179 (2023) 113644. https://doi.org/10.1016/j.enpol.2023.113644
  17. Aboagye B., Gyamfi, S., Antwi E. O, Djordjevic, S. (2023) Characterisation of visual defects on installed solar photovoltaic (PV) modules in different climatic zones in Ghana. Scientific African 20 (2023) e01682. https://doi.org/10.1016/j.sciaf.2023.e01682
  18. Asante K., Gyamfi S., Amo-Boateng M., (2023) Techno-economic analysis of waste-to-energy with a solar hybrid: A case study from Kumasi, Ghana. Solar Compass 6 (2023) 100041. https://doi.org/10.1016/j.solcom.2023.100041
  19. Peprah F., Gyamfi S., Effah-Donyina E., Amo-Boateng M. (2023) The pathway for electricity prosumption in Ghana. Energy Policy 177 (2023) 113582. https://doi.org/10.1016/j.enpol.2023.113582
  20. Iweh C.D., Gyamfi S., Tanyi E., Effah-Donyina E. (2023) Economic viability and environmental sustainability of a grid-connected solar PV plant in Yaounde – Cameroon using RETScreen expert. Cogent Engineering, 10:1, 2185946. https://doi.org/10.1080/23311916.2023.2185946
  21. Peprah F., Aboagye B., Amo-Boateng M., Gyamfi S. Effah-Donyina E. (2023) Economic evaluation of solar PV electricity prosumption in Ghana. Solar Compass 5 (2023) 100035. https://doi.org/10.1016/j.solcom.2023.100035
  22. Ayuketah I, Gyamfi S., Diawuo F. A, Dagoumas A.S. (2023) Assessment of low-carbon energy transitions policies for the energy demand sector of Cameroon. Energy for Sustainable Development 72(2023) 252-264. 72(2023) 252-264. https://doi.org/10.1016/j.esd.2022.12.014.
  23. Iweh C.D., Gyamfi S., Tanyi E., Effah-Donyina E. (2023) Assessment of the optimum location and hosting capacity of distributed solar PV in the southern interconnected grid (SIG) of Cameroon. International Journal of Sustainable Energy. https://doi.org/10.1080/14786451.2023.2168002
  24. Peprah F., Gyamfi S., Effah-Donyina E., Amo-Boateng M. (2022) Evaluation of reactive power support in solar PV prosumer grid. e-Prime – Advances in Electrical Engineering, Electronics, and Energy. https://doi.org/10.1016/j.prime.2022.100057
  25. Lahai U. M., Ofosu, E. A., Gyamfi S., Diawuo, F. A., Kallon H. A. P., (2022) Technical Considerations for the Design and Selection of Improved Cookstoves: A Review. International Journal of Engineering Trends and Technology Volume 70 Issue 12, 439-449 https://doi.org/10.14445/22315381/IJETT-V70I12P242
  26. Ayuketah Y., Gyamfi S., Diawuo F. A., Dagoumas A. S. (2022) Power generation expansion pathways: A policy analysis of the Cameroon power system Energy Strategy Reviews  44 (2022) https://doi.org/10.1016/j.esr.2022.101004
  27. Avordeh T. K, Gyamfi S, Opoku A. A. (2022) Estimating Residential Electricity Consumption for Appliance Use: A Statistical Model Approach 10.1109/ICECET52533.2021.9698647
  28. Peprah F., Gyamfi S., Amo-Boateng M., Buadi E., Obeng M., (2022) Design and construction of smart solar-powered egg incubator based on GSM/IoT.  Scientific African Volume 17, September (2022).  https://doi.org/10.1016/j.sciaf.2022.e01326
  29. Asamoah S. S., Gyamfi S., Uba F., Mensah S. G., (2022)Comparative assessment of a stand-alone and a grid-connected hybrid system for a community water supply system: A case study of Nankese community in the eastern region of Ghana. Scientific African 17, September (2022)  https://doi.org/10.1016/j.sciaf.2022.e01331
  30. Nyasapoh M., A, Debrah S. K., Twerefou D. K., Gyamfi S.,  Kholi, F. K (2022) An Overview of Energy Resources and Future Concerns for Ghana’s Electricity Generation. Journal of Energy Volume 2022. https://doi.org/10.1155/2022/1031044
  31. Peprah F., Gyamfi S., Amo-Boateng M., Effah-Donyina E. (2022) Impact assessment of grid-tied rooftop PV systems on LV distribution network (2022). Scientific African 16 (2022) https://doi.org/10.1016/j.sciaf.2022.e01172
  32. Ochiegbu C. V., Gyamfi S, Ofosu E. (2022) Modeling, Simulation and Design of Hydro-Solar Isolated Micro-grid without a Battery Storage System: A Case Study for Aba Business Cluster, Nigeria. International Journal of Engineering Trends and Technology Volume 70 Issue 2, 125-136, February, 2022  https://ijettjournal.org/archive/ijett-v70i2p215
  33. Aboagye B., Gyamfi, S., Antwi E. O, Djordjevic, S. (2022) Characterisation of Degradation of Photovoltaic (PV) Module Technologies in Different Climatic Zones in Ghana. Sustainable Energy Technologies and Assessments, 52(2022) 102034. https://doi.org/10.1016/j.seta.2022.102034
  34. Eliasu A., Derkyi N. S. A., Gyamfi S. (2022) Techno-Economic Analysis of Municipal Solid Waste Gasification for Electricity Generation. International Journal of Energy Economics and Policy, 2022, 12(1), 342-348. DOI: https://doi.org/10.32479/ijeep.11894
  35. Aboagye B., Gyamfi, S., Antwi E. O, Djordjevic, S. (2022) Investigation into the Impacts of Design, Installation, Operation and Maintenance Issues on Performance and Degradation of Installed Solar Photovoltaic (PV) Systems Energy for Sustainable Development 2022 (66): 165-176. https://doi.org/10.1016/j.esd.2021.12.003
  36. Gyamfi S., Asuamah, E.Y. & Gyabaah, J.A. (2022). Techno-economic challenges of pumped hydro energy storage. Elsevier. https://doi.org/10.1016/B978-0-12-818853-8.00011-X
  37. Gyamfi, S., Diawuo, F. A., Asuamah, E. Y., & Effah, E. (2022). The role of demand-side management in sustainable energy sector development. In Renewable Energy and Sustainability (pp. 325-346). Elsevier. https://doi.org/10.1016/B978-0-323-88668-0.00010-3
  38. Avordeh T. K, Gyamfi S, Opoku A. A. (2021) The Role of Demand Response in Residential Electricity Load Reduction using Appliance Shifting Techniques. International Journal of Energy Sector Management. Emerald Publishing Limited 1750-6220. doi/10.1108/IJESM-05-2020-0014
  39. Aboagye B., Gyamfi, S., Antwi E. O, Djordjevic, S. (2021) Degradation Analysis of Installed Solar Photovoltaic (PV) Modules under Outdoor Conditions in Ghana. Energy Reports 7 (2021) 6921–6931. https://doi.org/10.1016/j.egyr.2021.10.046
  40. Iweh C.D., Gyamfi S., Tanyi E., Effah-Donyina E. (2021) Distributed Generation and Renewable Energy Integration into the Grid: Prerequisites, Push Factors, Practical Options, Issues and Merits. Energies 2021, 14, 5375. https://doi.org/10.3390/en14175375
  41. Avordeh T. K, Gyamfi S, Opoku A. A. (2021) Quantitative Estimation of the Impact of Climate Change on Residential Electricity Demand for the City of Greater Accra, Ghana International Journal of Energy Sector Management. Emerald Publishing Limited 1750-6220. https://doi.org/10.1108/IJESM-08-2020-0008
  42. Ayebah A. I., Gyamfi S., Amuzuvi C. K. (2021) Making Energy Savings by the Engagement of Small and Medium-sized Enterprise on Energy Management.  Journal of Electrical and Electronic Engineering 2021; 9(2): 41-48. https://doi.org/10.11648/j.jeee.20210902.12
  43. Asuamah Y. E., Gyamfi, S., Dagoumas A. (2021) Potential of Meeting Electricity needs of Off-Grid Community with Mini-Grid Solar Systems. Scientific African Volume 11(2021). https://doi.org/10.1016/j.sciaf.2020.e00675.
  44. Aboagye B., Gyamfi, S., Antwi E. O, Djordjevic, S. (2021) Status of Renewable Energy Resources for Electricity Supply in Ghana. Scientific African Volume11 (2021) https://doi.org/10.1016/j.sciaf.2020.e00660.
  45. Aboagye B. Gyamfi S. Caesar Puoza, J. (2020) Performance Enhancement of Solar Photovoltaic Module by the Application of Different Coolants over the Photovoltaic Module Surface. JENRM, Vol. 6, No. 1, 1-6, 2020. https://doi.org/10.26796/jenrm.v6i1.161
  46. Aboagye B., Gyamfi S., Caesar Puoza J, Obeng M. (2020) Techno-economic Feasibility Analysis of Solar Photovoltaic System for Single Households in Peri-urban Areas Kumasi, Ghana. International Journal of Sustainable Energy Development (IJSED), Volume 8, Issue 1, 2020.  10.20533/ijsed.2046.3707.2020.0047
  47. Domfeh M. K, Gyamfi S., Amo-Boateng M., Andoh R., Antwi E. O., Tabor G (2020). Numerical Simulation of an Air-Core Vortex and Its Suppression at an Intake Using OpenFOAM Fluids (2020), 5, 221; https://doi.org/10.3390/fluids5040221
  48. Domfeh M. K, Gyamfi S., Amo-Boateng M., Andoh R., Antwi E. O., Tabor G. (2020) Numerical Simulation of an Air-core Vortex at a Hydraulic Intake using OpenFOAM Scientific African Volume 8 (2020) e00389. https://doi.org/10.1016/j.sciaf.2020.e00389
  49. Osabutey G. Opoku A. A., Gyamfi S. (2020) A Statistical Mechanics Approach to the Study of Energy Use Behaviour. Journal of Applied Mathematics Volume 2020, Article ID 7384053, 14 pages https://doi.org/10.1155/2020/7384053
  50. Domfeh M. K, Gyamfi S., Amo-Boateng M., Andoh R., Antwi E. O., Tabor G. (2020) Free Surface Vortices at Hydropower Intakes: A state-of-the-art review Scientific African Volume 8, July 2020, e00355. https://doi.org/10.1016/j.sciaf.2020.e00355
  51. Obeng M., Gyamfi S., Derkyi N. S., Kabo-bah T. A, Peprah F. (2020)Technical and Economic Feasibility of a 50 MW Grid-Connected Solar PV at UENR Nsoatre Campus. Journal of Cleaner Production. 247, 20 Feb 2020, 119159. https://doi.org/10.1016/j.jclepro.2019.119159
  52. Oduro A. M., Gyamfi S., Sarkodie A.S., Kemausuor F. (2019) Evaluating the Success of Renewable Energy and Energy Efficiency Policies in Ghana: Matching the Policy Objectives against Policy Instruments and Outcomes. Renewable Energy – Resources, Challenges and Applications. 2020 | journal-article DOI: 5772/INTECHOPEN.88278
  53. Gyamfi S., Derkyi N.S.A, Asuamah E.Y, Aduako J.A. (2018) Renewable Energy and Sustainable Development. In Kabo-bah A; Diji, C. J., Sustainable Hydropower in West Africa : 75 – 93. Academic Press. An imprint of Elsevier. https://doi.org/10.1016/B978-0-12-813016-2.00006-X
  54. Gyamfi S., Derkyi N.S.A, Asuamah E.Y (2018)The Potential and the Economics of Hydropower Investment in West Africa. In Kabo-bah A; Diji, C.J., Sustainable Hydropower in West Africa: 95 – 107. Academic Press. An imprint of Elsevier. https://doi.org/10.1016/B978-0-12-813016-2.00007-1
  55. Akolgo G.A, Essandoh E. O, Gyamfi S.,  Atta-Darkwa T., Kumi E. Y, Maia, C. M (2018) The Potential of a Dual Purpose Improved Cookstove for Low Income Earners in Ghana – Improved Cooking Methods and Biochar Production. Renewable and Sustainable Energy Reviews. 82 (2018) 269–379. http://dx.doi.org/10.1016/j.rser.2017.09.044
  56. Gyamfi S., Diawuo F. A., Kumi E. N., Frank S., Modjinou M. (2018) Energy Efficiency Situation in Ghana.  Renewable and Sustainable Energy Reviews 82 (2018) 1415–1423. https://doi.org/10.1016/j.rser.2017.05.007
  57. Darko A., Chan A. P, Gyamfi S., Olanipekun A., He B., Yu Y. (2017) Driving Forces for Green Building Technologies Adoption in the Construction Industry: Ghanaian Perspective. Building and Environment 125 (2017) 206-215. http://dx.doi.org/10.1016/j.buildenv.2017.08.053
  58. Saka M., Diawuo F.A., Katzenback R., Gyamfi S. (2017). Towards a Sustainable Electrification in Ghana: A Review of Renewable Energy Deployment Policies. Renewable and Sustainable Energy Reviews. 79 (2017) 544–557.  https://doi.org/10.1016/j.rser.2017.05.090
  59. Gyamfi S., Modjinou M., Djordjevic S. (2015) Improving Electricity Supply Security in Ghana – the Potential of Renewable Energy. Renewable and Sustainable Energy Reviews 43(2015)1035–1045. http://dx.doi.org/10.1016/j.rser.2014.11.102
  60. Urmee T., Gyamfi S. (2014) A Review of Improved Cookstove Technologies and Programs. Renewable and Sustainable Energy Reviews 33 (2014) 625–635. http://dx.doi.org/10.1016/j.rser.2014.02.019.
  61. Houston C., Gyamfi S., Whale J. (2013) Evaluation of Energy Efficiency and Renewable Energy Generation Opportunities for Small Scale Dairy Farms: A Case Study in Prince Edward Island, Canada. Renewable Energy 67 (2014) 20 – 29. http://dx.doi.org/10.1016/j.renene.2013.11.040
  62. Gyamfi S., Krumdieck S. and Urmee T. (2013) Residential Peak Electricity Demand Response – Highlights of some Behavioural Issues. Renewable and Sustainable Energy Reviews 25: 71-77. http://dx.doi.org/10.1016/j.rser.2013.04.006.
  63. Gyamfi S. and Krumdieck S. (2012) Scenario Analysis of Residential Demand Response at Network Peak Periods. Electric Power Systems Research 93: 32-38. http://dx.doi.org/10.1016/j.epsr.2012.07.004.
  64. Gyamfi S. and Krumdieck S. (2011) Price, Environment and Security: Exploring Multi-modal Motivation in Voluntary Residential Peak Demand Response. Energy Policy 39(5): 2993-3004. http://dx.doi.org/10.1016/j.enpol.2011.03.012.
  65. Gyamfi S., Krumdieck S.P. and Brackney L. (2009) Price, Environment and Security: Multi-Modal Motivation in Residential Demand Response. Engineering treNz: Transaction of Engineers New Zealand: online journal. http://www.ipenz.org.nz/ipenz/Forms/pdfs/treNz15.pdf

Other Publications (conference)

  1. Owusu J. J., Gyamfi S, Israel J. (2017) Household Electricity Tariff And Life Line Charges In Ghana – Policy Mismatch Presented at the International Conference on Climate Change and Sustainable Development, 25 July – 28 July, 2017, Eusbett International Conference Center, Sunyani, Ghana. (Conference Contribution – Full Conference paper)
  2. Domfeh M. K, Gyamfi S, Amo-Boateng M, Andoh R, Ofosu A. E, Kabo-Bah A. (2017) Intake Flow Simulation And Optimisation For Akosombo Hydropower Project Using Computational Fluid Dynamics: Concept And Methodology. Presented at the International Conference on Climate Change and Sustainable Development, 25 July – 28 July, 2017, Eusbett International Conference Center, Sunyan, Ghana. (Conference Contribution – Full Conference paper)
  3. Tieyiri V. G, Gyamfi S. (2017) Climate Change Impact on Africa: What does the Literature Say? Presented at the International Conference on Climate Change and Sustainable Development, 25 July – 28 July, 2017, Eusbett International Conference Center, Sunyan, Ghana. (Conference Contribution – Full Conference paper)
  4. Rahman M., Hettiwatte S. Gyamfi, S (2014) An Intelligent Approach of Achieving Demand Response by Fuzzy Logic based Domestic Load Management Australasian Universities Power Engineering Conference, AUPEC 2014, Curtin University, Perth, Australia. 28 September – 1 October, 2014 (Conference Contribution – Full Conference paper)
  5. Gyamfi S., Krumdieck S.P, and Brackney L. (2010) Pattern Recognition Residential Demand Response: An Option for Critical Peak Demand Reduction in New Zealand. Presented at the 4th international conference on sustainable development, 30 November – 3 December 2010, Auckland. (Conference Contribution – Full Conference paper)
  6. Watcharasukarn M., Krumdieck S. and Gyamfi S. (2009) Travel Behaviour under Fuel Constraint Study: TACA SIM. Hong Kong: International Conference on Applied Energy, 5-7 Jan 2009. (Conference Contribution – Full Conference paper)
  7. Gyamfi S., Krumdieck S. and Brackney L. (2008) Demand Response in the Residential Sector: A Critical Feature of Sustainable Electricity Supply in New Zealand. Auckland, New Zealand: 3rd International Conference on Sustainability Engineering and Science, 9-12 Dec 2008. (Conference Contribution – Full Conference paper)