ABSTRACT An intercom is a stand-alone voice communications system for use within a building or small collection of buildings, functioning independently of the public telephone network. Intercoms are generally mounted permanently in buildings and vehicles. Intercoms can incorporate connections to public address loudspeaker systems, walkie talkies, telephones. Four-way intercommunication system is nothing but the communication within four persons not close to one another. This does not mean w...
ABSTRACT An innovative approach to achieving autonomous vehicle navigation through the integration of image processing techniques and the Raspberry Pi platform. The aim is to develop a self-driving system that can analyze real-time images captured by onboard cameras and make informed decisions based on the detected objects and road conditions. By employing advanced computer vision algorithms, such as object detection and lane detection, the system can identify and tracking obstacles, recogniz...
This research reviews the effects of a standard deviation on time response and frequency response of Gaussian filter. In the research, standard deviations of 0.5, 1, 1.5, 2, 2.5 and 3 were applied to normalized Gaussian filter in time domain and frequency domain. From the result of the simulation, it was observed that in the time domain, the peak amplitude of the filter increased with a decrease in the standard deviation and the execution time decreased with a decrease in standard deviation. ...
This review paper comprehensively detailed the methodologies involved in data analysis and theevaluation steps. It showed that steps and phases are the two main methodological parameters to be considered during data assessment for data of high qualities to be obtained.It is reviewed from this research that poor data quality is always caused by incompleteness, inconsistency, integrity and time-related dimensions and the four major factors that causes error in a dataset are duplication, commuta...
Qualitative research is concerned with feelings, ideas, or experiences. Finding insights that can result in testable hypotheses is the main goal of the data collection, which is frequently done in narrative form. During the exploratory phases of a study, educators use qualitative research to find patterns or fresh perspectives. A methodology called qualitative research is created to gather non-numerical data to produce insights. It is not statistical and is either semi-structured or unstructu...
The study investigated principals’ administrative strategies as correlates of teachers’ job performance in public secondary schools in Obollo-Afor Education Zone of Enugu State. Four research questions and four null hypotheses guided the study. The study adopted a correlational survey design. The population of the study was 1,854 principals and teachers in 48 secondary schools in the Zone. A sample of 605 teachers was drawn using proportionate stratified random sampling technique. Qu...
Different path loss models have been predicted for different locations. Nevertheless, none of these models can be regarded as a superior model, because environmental factors play a vital role in the path loss of every environment. In this paper, signal attenuation prediction models for Global System for Mobile Communication (GSM) networks in the University of Nigeria, Nsukka for four different networks namely Airtel, Globacom, Mobile Telecommunication Network (MTN), and 9mobile networks w...
The use of magnetron sputtering for deposition of the metal electrode in perovskite solar cells has been limited because of the damage to the organic hole transport layer by high kinetic energy particles during the sputtering process. In this paper, a systematic investigation into the effect of sputtering power, argon flow rate, sputtering duration, and argon pressure on the performance of the perovskite cells was conducted. The results of this work show that high power conversion efficie...
In this paper, models for negative and positive clamper circuits were developed. The models developed were simulated and data collected. Simulation results obtained showed that series capacitance needed to design negative clamper circuit was directly proportional to the duty cycle and period of the input signal. Considering the positive clamper circuit, the series capacitance is inversely proportional to the duty cycle and directly proportional to the period of the input signal. Looking at th...
Maximum power point (MPP) tracking technique based an optimized adaptive differential conductance technique was developed in this paper. The performance of the algorithm developed in this paper was evaluated at solar irradiance of 1,000, 800 and 600 W/m2 and at temperature of 298, 328 and 358 K. From the simulation results, it was observed that the impedance of the panel decreases as the irradiance increases while the impedance of the load is not affected by the irradiance. This technique was...
Antisolvents play a significant role in obtaining high-quality perovskite films during the fabrication process. This paper reports a novel mixture of two antisolvents (methyl acetate and chloroform) that proves effective for fabricating high-quality perovskite films in a high humidity ambient. The results show that the use of methyl acetate alone as the antisolvent enables the fabrication of dense perovskite films (MAPbI3) in a high humidity ambient, but with a rough surface, while mixing...
This paper investigates the effect of the input current and the distance of separation between the IR transmitter and IR receiver on the voltage detected by infrared (IR) receiver Line-of-Sight IR propagation. The research was carried out using IR533C IR transmitter and FDS 100 IR receiver. Regulated digital power supply was used to provide stable 5V supply to the transmitter circuit. A 5V, 100kHz square wave from the signal generator was used to switch the BC338 transistor to modulate the...
This review paper comprehensively reviewed the administrative strategies adopted by some administrators for effective employer’s job performance. Different strategies were reviewed but the four major ones that were detailly reviewed in this paper are teachers’ involvement in decisions-making, proper delegation of duties and staff's warfare, open communications and adequate provision of instructional facilities to the employers and finally engaging employers regularly in workshop. Among al...
This research paper undertakes the development of water pumping system that was capable of automatically managing water budgets from a reservoir through a microcontroller (Arduino Uno Microcontroller) subsystem. A user-friendly and efficient water management system that has the capability to irrigate farms based on automated algorithm, logic and electronic circuitry was developed. The Object Oriented System Analysis and Design (OOSAD) methodology was used for the analysis and development of t...
The toxicity and instability of some metal-halides has made it unfovarouble to be used for the development and fabrications of perovskites despite its good Power Conversion Efficiencies (PCE). The need to suggest good perovskites absorber materials that has excellent Dimensionality, optical band gap, and power conversion efficiencies to substitute lead in photovoltaic application is very essential in the recent research. This research work reviewed and suggested the combinable good perovskite...