Voltage Collapse and the Nigerian National Grid

A modern electric power system network (PSN) is typically a large and complex engineering system whose healthy existence is crucial to industrial and socio-economic development of Nations. Voltage instability and collapse contribute to large extent to system collapse or blackouts and it is one of the major concerns for today’s electric power system operations. The Nigerian National grid (NNG) experiences on an average of thirty-five (35) system collapse every year over the past ten (10) years. This paper presents an overview and classification of system collapse on the NNG. Keywords — Voltage collapse, Voltage instability, and Nigerian National Grid (NNG

Performance Improvement of Wireless Network Based on Effective Data Transmission

A major requirement of any computer network is scalability. This can be as a result of increase in the number of users, upgrading due to technological advancement, additional services, or the need for performance improvement. This will inevitably require changing infrastructure, deploying new applications, and dealing with security which definitely touches both hardware and software, in the sense that, the complexities of the hardware, software and firmware increase with the attendant growth of the network and maintainability. However, for the network to remain reliable and efficient, it is necessary that, implementation and administration of it requires a means of monitoring both the model of the network structures and processes occurring in them. The efficiency and throughput of the network depend on improving the effectiveness of data transmission carried out by the network protocols. This paper discusses the use of a protocol to meet the technological challenge towards improving the performance and throughput of a wireless network based on effective data transmission

Effectiveness of Information and Communication Technology (ICT) in Policing in Nigeria

This paper examined the impact of Information and Communication Technology (ICT) in Effective Policing. It is an indisputable fact that the problem of crime has become acute that the police force as a government apparatus has no choice other than to employ the use of technologies to curb crime. However, in order to achieve the objective of the work, cross sectional survey method was used as a research method and instrument to collect data from respondents on the area of enquiry. The respondents were selected using the Multi-stage, Simple (probability) Random Sampling and Purposive Technique, six hundred sample sizes were chosen. The data collected was analyzed using the Statistical Package for Social Sciences (SPSS). Hypotheses were formulated and tested using the Pearson’s Product Moment Correlation. It was found out that the use of ICT and other Technologies enhances the performance and effectiveness of the Police

WiMAX - appropriate technology to provide affordable access to ICTs infrastructure and services in developing countries

WiMAX is a broadband wireless standard that enjoys widespread support from both the computer and telecommunications industries worldwide, making this technology particularly cost effective. It is engineered to deliver significant business benefits to operators and users in diverse environments (enterprise, consumer, emerging, public service), geographies and demographies (urban, suburban, rural), both over the short and long terms. The paper intends to highlight some points that make WiMAX the most appropriate technology solution to favor the broadband ICTs access in developing countries

Modeling of Orthogonal Frequency Division Multiplexing (OFDM) for Transmission in Broadband Wireless Communications

Orthogonal Frequency Division Multiplexing (OFDM) is a multi carrier modulation technique that provides high bandwidth efficiency because the carriers are orthogonal to each other and multiple carriers share the data among themselves. The main advantage of this transmission technique is its robustness to channel fading in wireless communication environment. This paper investigates the effectiveness of OFDM and assesses its suitability as a modulation technique in wireless communications. Several of the main factors affecting the performance of a typical OFDM system are considered and they include multipath delay spread, channel noise, distortion (clipping), and timing requirements. The core processing block and performance analysis of the system is modeled usingMatlab

Modular Relative Jacobian for Dual-Arms and the Wrench Transformation Matrix

A modular relative Jacobian is recently derived and is expressed in terms of the individual Jacobians of stand-alone manipulators. It includes a wrench transformation matrix, which was not shown in earlier expressions. This paper is an experimental extension of that recent work, which showed that at higher angular end-effector velocities the contribution of the wrench transformation matrix cannot be ignored. In this work, we investigate the dual-arm force control performance, without necessarily driving the end-effectors at higher angular velocities. We compare experimental results for two cases: modular relative Jacobian with and without the wrench transformation matrix. The experimental setup is a dual-arm system consisting of two KUKA LWR robots. Two experimental tasks are used: relative end-effector motion and coordinated independent tasks, where a force controller is implemented in both tasks. Furthermore, we show in an experimental design that the use of a relative Jacobian affords less accurate task specifications for a highly complicated task requirement for both end-effectors of the dual-arm. Experimental results on the force control performance are compared and analyzed

Unusually High Prevalence of Asymptomatic Bacteriuria among Male University Students on Redemption Camp, Ogun State, Nigeria

Differences are known to occur in prevalence rates in urinary tract infections (UTI) between men and women due to the difference between the urinary tracts of the sexes. Moreover, different organisms are known to infect and cause bacteriuria in men. When urine samples from 55 apparently healthy male students of Redeemer’s University were examined, nine bacteria species including Micrococcus luteus, Viellonella parvula, Micrococcus varians, Streptococcus downei, Streptococcus pneumonia, Bacillus subtilis, Streptococcus pyrogenes, Staphylococcus saprophyticus,and Enterococcus aquimarinus were isolated from the samples. The two most prevalent organisms reported in this study were Micrococcus luteus (40%) and Micrococcus varians (27.3%). The implication of the high prevalence rates (54.5%) of asymptomatic bacteriuria obtained in this population is discussed.Key words: Asymptomatic UTI, bacteriuria, Micrococcus luteu

Implementation of Wi-Fi based location tracking system based on signal strength measurement and artificial neural network

Radio frequency signals are present everywhere and almost at any time, from GSM mobile phones to wireless devices. Wi-Fi enabled devices can be located within the area of deployment. A location system that takes advantage of the availability of these signals and the received signal strength indicator (RSSI) measured by these mobile devices was developed using Wireless Fidelity (Wi-Fi) as access points (APs). The concept of Artificial Neural Network (ANN) was applied to the location system for computation of location coordinates. This allows for tolerance and generalization of results. Location information of target devices was made available via a web interface. The user had the option of selecting registered device in a location database server using Media Access Control (MAC) address of their tag and the computed location is displayed on a floor plan of the building