Henry O. Okoyo

Work place: School of Computing and Informatics, Maseno University, Private Bag, Maseno, Kenya

E-mail: okoyo.ho@gmail.com


Research Interests: Applied computer science, Computer systems and computational processes, Computer Architecture and Organization, Theoretical Computer Science


Henry O. Okoyo is a PhD holder from Manchester University. He is currently a member of faculty, Computer Science Department, Maseno University, Kenya. He is currently a PhD supervisor to James Obuhuma.

Author Articles
Shortcomings of Ultrasonic Obstacle Detection for Vehicle Driver Assistance and Profiling

By James I. Obuhuma Henry O. Okoyo Sylvester O. McOyowo

DOI: https://doi.org/10.5815/ijitcs.2019.06.04, Pub. Date: 8 Jun. 2019

Obstacle detection is a challenging problem that has attracted much attention recently, especially in the context of research in self-driving car technologies. A number of obstacle detection technologies exist. Ultrasound is among the commonly used technologies due to its low cost compared to other technologies. This paper presents some findings on the research that has been carried out by the authors with regard to vehicle driver assistance and profiling. It discusses an experiment for detection of obstacles in a vehicle driver’s operational environment using ultrasound technology. Experiment results clearly depict the capabilities and limitations of ultrasound technology in detection of obstacles under motion and obstacles with varied surfaces. Ultrasound’s wavelength, beam width, directionality among others are put into consideration. Pros and cons of other technologies that could replace ultrasound, for instance RADAR and LIDAR technologies are also discussed. The study recommends sensor fusion where several types of sensor technologies are combined to complement one another. The study was a technical test of configurable technology that could guide future studies on obstacle detection intending to use infrared, sound, radio or laser technologies particularly when both the sensor and obstacle are in motion and when obstacles have differing unpredictable surface properties.

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Driver Behaviour Profiling Using Dynamic Bayesian Network

By James I. Obuhuma Henry O. Okoyo Sylvester O. McOyowo

DOI: https://doi.org/10.5815/ijmecs.2018.07.05, Pub. Date: 8 Jul. 2018

In the recent past, there has been a rapid increase in the number of vehicles and diversification of road networks worldwide. The biggest challenge now lies on how to monitor and analyse behaviours of vehicle drivers as a catalyst to road safety. Driver behaviour depends on the state and nature of the road, the state of the driver, vehicle conditions, and actions of other road users among other factors. This paper illustrates the ability of Dynamic Bayesian Networks towards determination of driving styles with respect to acceleration, cornering and braking patterns. Bayesian Networks are probabilistic graphical models that map a set of variables and their conditional dependencies. Sample test results showed that the 2-Time-slice Bayesian Network model is suitable for generation of driver profiles using only four GPS data parameters namely speed, altitude, direction and signal strength against time. The model classifies driver profiles into two sets of observations: driver behaviour and nature of operational environment. Adoption of the model could offer a cost effective, easy to implement and use solution that could find many applications in vehicle driver recruiting firms, vehicle insurance companies and transport and road safety authorities among other sectors.

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