Dr. Zakayo Ndiku MORRIS

Publications in Journals:

• Waweru, P. K., Atitwa, E. B., Morris, Z. N., & Kailemia, P. N. (2025). Semi-Markovian analysis of the prognosis of breast cancer between diagnosis and treatment initiation in Kenya: A case study of two counties. Commun. Math. Biol. Neurosci., 2025, Article-ID.
• K. T. Wong, Z. N. Morris, & C. J. Nnonyelu, “Rules-of-thumb to design a uniform spherical array for direction finding – its Cramer-Rao bounds’ nonlinear dependence on the number of sensors,” The Journal of the Acoustical Society of America, vol. 145, no. 2, pp. 714-723, February 2019. https://pubs.aip.org/asa/jasa/article/145/2/714/993753
• K. T. Wong, Z. N. Morris, D. M. Kitavi, & T. C. Lin, “A uniform circular array of isotropic sensors that stochastically dislocate in three dimensions – the hybrid Cramer-Rao bound of direction-of-arrival estimation,” The Journal of the Acoustical Society of America, vol. 146, no. 1, pp. 150-163, July 2019. https://pubs.aip.org/asa/jasa/article/146/1/150/993796
• Z. N. Morris & K. T. Wong, “Comparing the “rim” versus the “filled” rectangular array grids-their direction-finding Cramer-Rao bounds,” IEEE Transactions on Aerospace and Electronic Systems, vol. 55, no. 4, pp. 1945-1956, August 2019. https://ieeexplore.ieee.org/abstract/document/8528521/
• C. J. Nnonyelu & Z. N. Morris, “Acoustical direction finding using a Bayesian regularized multilayer perceptron artificial neural networks on a tri-axial velocity sensor”, International Journal of Mechatronics, Electrical and Computer Technology, vol. 10, no. 35, pp. 4493-4501, January 2020. http://repository.embuni.ac.ke/handle/embuni/3971
• Z. N. Morris, K. T. Wong, & Y.I. Wu, “3D Dislocations in a uniform linear array’s isotropic sensors – direction finding’s hybrid Cramer-Rao bound”, The Journal of the Acoustical Society of America, vol. 147, no. 5, pp. 3209-3220, May 2020.https://pubs.aip.org/asa/jasa/article/147/5/3209/993546
• C. J. Nnonyelu, Z. N. Morris, & A Madukwe, “On the Performance of L- and V-shaped arrays of cardioid microphones for direction finding”, IEEE Sensors Journal, vol. 21, no. 2, pp. 2211-2218, September 2020.https://ieeexplore.ieee.org/abstract/document/9186059/
• L. Yang, K. T. Wong, & Z. N. Morris, “A centrosymmetric array comprising a horizontal uniform circular subarray and a vertical uniform linear subarray – its design in reference to its direction-finding Cramer-Rao bound,” IEEE Transactions on Aerospace and Electronic Systems, vol.57, no. 2, pp. 1624-1632, Dec 2021.https://ieeexplore.ieee.org/abstract/document/9300215/
• Presentation of Papers at Academic and Professional Conferences
  1.    Z. N. Morris, K. T. Wong, & Y. Han, “Hybrid Cramer-Rao Bound for Near-Field Source Localization Using a Spatially Spread Acoustic Vector Sensor,” The Journal of the Acoustical Society of America, vol. 145, p. 1801, May 2019.
  2.    C. J. Nnonyelu, C. -C. L. Cheung, & Z. N. Morris, “Acoustical Direction Finding Using a Bayesian Regularized Multilayer Perceptron Artificial Neural Networks on a Tri-Axial velocity Sensor,” IEEE International Conference on Mechatronics, Automation and Cyber-Physical Computer Systems, March 2019.
  3.    Z. N. Morris, K. T. Wong, D. M. Kitavi, & T. C. Lin, “The hybrid Cramer-Rao bound of direction finding by a uniform circular array of isotropic sensors that suffer stochastic dislocations,” The Journal of the Acoustical Society of America, vol. 142, no. 4, p. 2554, December 2017.