Dr David Iiyambo

Brief Biography

Dr David Shituula Iiyambo is a Senior Lecturer in Applied Mathematics and Head of the Department of Mathematics, Statistics and Actuarial Science at the Namibia University of Science and Technology (NUST). He holds a PhD in Applied Mathematics from the University of KwaZulu-Natal and an MSc in Applied Mathematics from the University of Cape Town. His research lies at the interface of mathematical analysis, modelling and real-world decision-making, with particular interests in nonlinear dynamical systems, mathematical epidemiology, optimal control, fractional-order models, chemotaxis, population dynamics, and fisheries and marine resource modelling. His recent work has addressed the transmission and control of livestock and human infectious diseases, including lumpy skin disease, foot-and-mouth disease and hepatitis E, as well as bioeconomic and ecosystem-based models for sustainable management of marine resources. He has more than two decades of university teaching experience and is actively involved in postgraduate supervision, thesis examination, curriculum development, academic leadership and institutional governance. Beyond the University, he has contributed to the advancement of mathematics through national and international Olympiad activities, including serving as Namibian Team Leader at the Pan-African Mathematics Olympiad and the International Mathematical Olympiad.

Teaching Courses

Precalculus, Calculus I & II, Advanced Calculus, Linear Algebra, Sets and Numbers, Functions of a Single Variable, Ordinary Differential Equations, Partial Differential Equations, Real Analysis I & II, Vector Analysis, Numerical Analysis, Dynamical Systems and Mathematical Biology.

Research Interests

Mathematical Modelling, Mathematical Epidemiology, Mathematical Biology, Nonlinear Dynamical Systems, Optimal Control and Cost-Effectiveness Analysis, Fractional Differential Equations and Fractional-Order Models, Chemotaxis Models, Population Dynamics, Fisheries and Marine Resource Modelling, Bioeconomic and Ecosystem-Based Modelling, Sensitivity and Uncertainty Analysis, Numerical Methods and Biostatistics.

Key Publications

Peer Reviewed Articles:

• Iiyambo, D.S. (2026). Budget-constrained optimal control and cost-effectiveness of vaccination, vector control, and movement restriction for lumpy skin disease. AppliedMath, 6(9). https://doi.org/10.3390/appliedmath6090153
• Iiyambo, D.S. & Eegunjobi, A.S. (2026). Mathematical modeling, sensitivity analysis, and optimal control of lumpy skin disease transmission in cattle populations. J. Egypt. Math. Soc., 34(2), 81–109. https://doi.org/10.21608/joems.2026.461804.1088
• Eegunjobi, A.S., Shuungula, O., Iiyambo, D.S. & Chere, N. (2026). A fractional waterborne compartmental model of the hepatitis E epidemic in Namibia’s informal settlement. Asia Pacific Journal of Mathematics, 13. https://doi.org/10.28924/APJM/13-120
• Nangolo, P.N., Iiyambo, D.S. & Eegunjobi, A.S. (2026). A nonlinear multispecies fisheries model for Namibian coastal waters: Implications for food security and marine ecosystem resilience. Applied Sciences and Development, 4(2), 121–140. https://doi.org/10.58524/app.sci.def.v4i2.1401
• Nangolo, P.N., Iiyambo, D.S. & Eegunjobi, A.S. (2026). A non-linear dynamical model of fishery resources in the presence of toxic algae. International Journal of Advances in Applied Mathematics and Mechanics, 14(1), 135–153. https://doi.org/10.26541/ijaamm.2026.140112
• Nangolo, P., Iiyambo, D.S. & Eegunjobi, A.S. (2026). Dynamic estimation of sustainable harvest levels along the Namibian coast using bioeconomic and ecosystem-based mathematical models. International Journal of Advances in Applied Mathematics and Mechanics, 13(4), 297–311. https://doi.org/10.26541/ijaamm.2026.130413
• Eegunjobi, A.S., Chere, N., Iiyambo, D. & Ndeevelo, P. (2025). Mathematical analysis of FMD with optimal control. Asia Pacific Journal of Mathematics, 12. https://doi.org/10.28924/APJM/12-42
• Iiyambo, D. & Willie, R. (2018). Semigroup and blow-up dynamics of attraction Keller-Segel equations in scale of Banach spaces. African Diaspora Journal of Mathematics (N.S.), 21(1), 1–31. https://projecteuclid.org/euclid.adjm/1520391703
• Iiyambo, D. (2017). Analysis of the basic Ross-Macdonald malaria model parameters. International Science and Technology Journal of Namibia, 10, 158–171. http://hdl.handle.net/11070/2197