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Recent Submissions
A comprehensive review on the feasibility and challenges of millimeter wave in emerging 5G mobile communication
(U.P, 2019) Agubor,Cosmas Kemdirim; Akwukwuegbu, Isdore; Olubiwe, Mathew; Nosiri, Chikezie Onyebuchi; Ehinomen, Atimati; Olukunle, Akande Akinyinka; Okozi, Samuel Okechukwu; Ezema, Longinus; Okeke, Benjamin Chukwujekwu
This article presents a comprehensive review on the feasibility and challenges of millimeter wave in emerging fifth generation (5G) mobile communication. 5G, a multigigabit wireless network is the next generation wireless communication network. The mmWave cellular system which operates in the 30-300 GHz band has been proposed for use as the propagation channel. Its large bandwidth potential makes it a candidate for the next-generation wireless communication system which is believed to support data rates of multiple Gb/s. High frequency bands such as mmWave have channel impairments. These impairments are challenges that are necessary to be properly understood. Employing mmWave as a propagation channel requires dealing with these challenges which this paper is aimed at reviewing. One aim of the work is to discuss these challenges in a more elaborate manner using simple mathematical equations and graphics to ensure clarity. To achieve this, current related works were studied. Challenges and solutions are identified and discussed. Suggested research directions for future work are also presented. One is developing suitable electronic such as fast analog-to-digital (ADC) and digital-to-analog (DAC) systems necessary for the transmitter/receiver (TX/RX) system.
Sociodemographic factors influencing the uptake of rapid diagnostic test kits for the management of malaria among mothers of under five in a typical Nigerian population
(U. P., 2021) Dozie, U. W.; Ebirim, Chikere I. C; Nwobi, U. O.; Chukwuocha, U. M.; Ibe, S. N. O.; Dozie, I. N. S.
Globally, malaria constitutes a crucial public health challenge since it is the third major cause of death among children under the age of 5. Prompt and effectual malaria diagnosis is the major approach to the control and management of the disease. Objectives: The study investigated sociodemographic factors that influence the uptake of rapid diagnostic test (RDT) for malaria management among mothers of under 5. Method of Study: A descriptive cross-sectional design was used in the study in which 420 mothers of under 5 were randomly selected from five electoral wards in Owerri West L.G.A of Imo state. Structured questionnaire was used in data collection. Data were analyzed with SPSS statistical package (Version 21) in which Chi-square at 5% probability level was used to ascertain the association between sociodemographic and uptake of rapid diagnostic test (RDT). Results: Results showed that the mothers 161 (38%) were mostly in 30–49 years age bracket, were married (%). More than one-quarter of them was secondary school certificate holders who were civil servants who earn average monthly income of 10,000–17,000₦ 183 (44%). Less than half 180 (42.9%) of the mothers do test their child with RDT, particularly when their child has fever 103 (24.5%). Moreover, larger proportions 161 (89%) of this group know how to carry out RDT. Most of them indicated positive result of RDT to be double line on the strip 155 (86.1%). More than three-quarter of them 168 (93.3%) still use RDT even when they are aware that it involved finger prick of blood from the child. Majority of them 252 (60%) indicated that their custom/religion allows blood test when the child is ill. It was shown that the uptake of mRDT was more pronounced among mothers within the age group of 18–29 years (67.5%) (χ2 = 50.12; P < 0.001) who were single (75%) (χ2 = 74.77; P < 0.001). Uptake of mRDT was also highest (71.4%) among respondents who had tertiary education (χ2 = 91.35, P < 0.001) and are civil servants (57.1%) (χ2 = 65.80; P < 0.001) who earn average monthly income of 18,000 (68.8%) (χ2 = 34.65; P < 0.001). Within the communities, uptake of mRDT was
highest among mothers from Obinze compared to other communities with significant association (χ2 = 22.17; P < 0.001). Conclusion: Uptake will, however, be enhanced if the cost of RDT-based management is reduced. Enhancing the health education through media, conferences, seminars, and workshops using local dialects will also help in raising the knowledge and understanding of less or non-educated mothers on the benefits of RDT.
Soil enivironmental metals speciation and associated health risks in selected edible leafy plants on Amaechi and Four-Corner dumpsites in Enugu State, Nigeria
(U. P., 2014) Obasi, N. A.; Elom, S. O.; Edeogu, C. O.; Alisa, C. O.; Obasi, S. E.
This work evaluated environmental metals speciation and the associated health risks using fiveselected edible leafy plants in Amaéchi and Four-Corner dumpsites in Enugu, Enugu State,Nigeria. The soil and plants samples were obtained from Amaéchi and Four-Corner dumpsitesin Enugu and a nearby farm land (control site) and were subjected to standard methods ofchemical analysis. Results obtained showed that mean soil physicochemical parameters andtotal extractable metals were significantly higher (P < 0.05) in the dumpsites compared to controlsite. Carbon:Nitrogen (C:N) ratio was significantly higher (P < 0.05) in the control site compared to that in Amaéchi dumpsite. Sequential extraction showed higher percentages (%) of the nonresidual fraction for all the metals studied except Cu and Cr. The mean order of mobility and bioavailability of the metals were: Pb > Fe > Cd > Zn > Mn > Cr > Ni > Cu. Total mean concentrationof metals in roots, stems and leaves of Amaranthus hybridus, Talinum triangulare, Carica papaya,Ipomea batatas and Luffa aegyptica were significantly higher (P < 0.05) in the dumpsitescompared to control site. The translocation factor, biological concentration factor and biologicalaccumulation coefficient values of the plant species varied for all the metals. The health risks implications of the study were discussed.
Performance improvement of a direction finding system antenna using method of moment (MOM)
(U. P., 2020-01-15) Anaebo, Ogonna F.; Ezeh, Gloria N.; Nosiri, Onyebuchi C.; Agubor, Cosmas K.
This paper focuses on the Performance Improvement of a Direction Finding System Antenna Using Method of Moment (MoM) Approach. The work is developed to provide an approximate current distribution for a direction finding system antenna by employing the use of Method of Moment on an array of Yagi-uda antenna. The parameters of the experimental antenna are derived and analyzed via Magnetic Vector Potential (MVP) operator. The accurate current flowing through the radiating elements of the direction finding system is analyzed using combination of Method of Moment technique and Magnetic Vector Potential (MVP) operator. This helps to avoid the detection of false alarms and inability of the system to detect remote targets. A typical direction finding system Yagi antenna is designed and operated at a frequency range of 0.6- 0.8 GHz. The antenna has a single reflector, an active (driven) element and three (3) parasitic directors. The antenna parameters are simulated using MatLab R2010a software tool. The average pointing vector of the designed Yagi antenna was obtained as 3.73watt per square metre, and Radiation Intensity value of about 9.400 coulomb per kilogram. The simulation results indicate an appreciable increase in directivity of 9.03dBi, an enhanced directive gain compared to that of the equivalent dipole antenna of 1.76dBi, signifying 7.27dBi enhancement.
An evaluation of hand trajectory gesture controlled vehicular robot
(Nigeria Consltants' Network (CN), 2021) Atimati, E. E.; Ezema, Longinus. S.; Okafor, K. C.; Achumba, I. E.; Ifediora, E. C.; Agubor, C. K.
Vehicular robotics (VRs) is an emerging field in Mechatronics application that offers numerous benefits to assisted living systems, exploits in unsafe terrains, agricultural harvesting, and manufacturing automation, among others. The absence of gesture angular displacement to speed relationship remains unresolved in literature. Existing systems controlled by hand gesture uses Radio Frequency (RF) module as a medium of wireless communication. In this paper, a reengineered VR controlled by five palm gestures is implemented and evaluated. An accelerometer-powered transmitter circuitry for the palm glove is realized while integrating Bluetooth spectrum at the VR receiver for wireless signalling. C+ constructs are introduced for end-to-end control between the transmitter and receiver. Performance assessment carried out on actual speed, response time and a blind spot in both autonomous and semi autonomous modes provided satisfactory insights. It is observed that in semi-autonomous mode (gesture mode), under tilting palm angle ranged 0-40 degrees, a minimum speed of 0.55m/s was observed. A medium speed of 0.63m/s and a maximum speed of 0.91m/s are obtained at 40 to 60 degrees and 70 to 90 degrees respectively. Furthermore, the autonomous mode offered a speed of 0.97m/s.