Browsing by Author "Agubor, Cosmas Nkemmdirim"

Now showing 1 - 2 of 2
  • Thumbnail Image
    ItemOpen Access
    Performance comparison of the designed microcontroller heartbeat monitor and clinical stethoscope medical insturments based on statistical approach
    (IAEME, 2021) Akwukwaegbu, Isdore Onyema; Ezugwu, Ernest Ozoemela; Agubor, Cosmas Nkemmdirim; Opara, Raymond Okechukwu; Olubiwe, Mattew; Obichere, Jude-Kennedy Chibuzo
    Heart related diseases are becoming more rampant, which if not properly checked and controlled, will continue to contribute a greater percentage of death rates among the younger generations. Controlling this deadly disease will be initiated by monitoring individual heartbeat rate regularly by a new low cost invented microcontroller based heartbeat medical measuring and monitoring instrument developed using electronic engineering techniques. The developed device uses electric microphone to detect the heartbeat and convert it to alternating current (ac) signal in millivolts, which is later amplified by a non inverting amplifier. A Schmitt trigger (555 timer) coverts the amplified ac signal into a square wave (one pulse is represented by one square). These square waves are used to count the number of squares for 60 seconds and display the result on the liquid crystal display (LCD) screen. The developed device is packaged in a plastic casing with adequate spacing provided to accommodate all components. The mean and standard deviation measured heart beat results obtained using the developed device and conventional clinical stethoscope range from 70.63 to 82.37 beat per minute(bpm) and 69.65 to 81.63 beat per minute(bpm) respectively. The result obtained using the developed device when compared to those obtained from the manual test involving counting of heartbeat fall satisfactorily within the acceptable range of 60 to 120 beat per minute(bpm). This developed device is useful for families, hospitals, clinics, community medical centres and for other medical purposes.
  • Thumbnail Image
    ItemOpen Access
    Transient configuration of a photovoltaic-deiesel energy sources for electric power production in Multi-Engineering Complex of Federal University of Technology, Owerri, Nigeria
    (U. P., 2021) Akwukwaegbu, Isdore Onyema; Anumaka, Michael Chukwukadibia; Agubor, Cosmas Nkemmdirim
    The work covers transient configuration of the grid connected photovoltaic-diesel power production in multiEngineering building complex of Federal University of Technology, Owerri (FUTO), Nigeria. The electric power shortage in Nigeria and the global drive towards exploring new energy sources have facilitated the consideration of the grid connected photovoltaic-diesel power generation, as a viable solution to poor energy supply system in multi-Engineering complex of FUTO, Nigeria. The work is achieved through estimation of complex’s daily average load profile in a consecutive number of ten hours, complex`s component selection and sizing of solar panels and solar PV modules, inverter without battery storage capacity, diesel generator capacity, transient configuration and modeling using Matlab/Simulink Sim scape Tool. The same tool is deployed for the transient configuration simulation of the developed system. The performance evaluation of the simulation results revealed that the active and reactive powers recorded permissible elongated transient duration period ranging from 0 to 3 seconds when the diesel generator is supplying the set load alone. However, when PV and diesel generator are connected to the building complex load without the grid, the transient optimum operation ranging from 0 to 2 seconds is recorded. The estimated load for the complex is approximated as 150kW, and this load operates at an average duration of 10 hours daily to produce approximately a total daily energy for the complex as 2,000KWh per day throughout the lifetime of the system design, which is shared among the PV-diesel power plant configuration at the ratio of 60%:40% daily. The PV system would supply 60% of the total daily power and energy demand of 89.616kW and 1,176.384KWh per day whereas, the diesel generator supplies 40% of the total daily power and energy demand of 59.744kW and 784.256KWh per day, so as to reduce the daily cost of fuel consumption.