Showing papers by "Kennedy Chinedu Okafor published in 2014"

Performance Analysis of R-DCN Architecture for Next Generation Web Application Integration

Abstract: With the astronomical growth in online presence vis-a-vis the IT industry across the globe, there is an urgent need to evolve cloud based DataCenter architectures that can rapidly accommodate web application integrations which can serve the energy industries, educational sector, finance sector, manufacturing sector, etc. Previous works in DataCenter domain have not investigated on cloud based DataCenter Servercentric characteristics for evaluation studies. This paper then proposed a Reengineered DataCenter (R-DCN) architecture for efficient web application integration. In this regard, attempt was made to address network scalability, efficient and distributed routing, packets traffic control, and network security using analytical formulations and behavioural algorithms having considered some selected architectures. In this work a simulation experiment was carried out to study six key performance metrics for all the architectures. It was observed that the network throughput, fault-tolerance/network capacity, utilization, latency, service availability, scalability and clustering effects of R-DCN responses with respect to above Key Performance (KPIs) metrics were satisfactory when compared with BCube and DCell architectures. Future work will show a detailed validation using a cloud testbed and CloudSim Simulator.

A Novel Framework for Cloud Energy Metering System (CEMS) in Solar PV Plant

Abstract: The smart grid initiative with emphasis on Advanced Metering Infrastructure (AMI) has attracted attention to various individuals and governments in the energy industry. This research proposes a Cloud Energy Metering System (CEMS) based on a precision metering IC (ADE7756) and PIC embedded controller (PIC 16F887) with an RF communication link. This will communicate with a location based Enterprise Energy Tracking Analytic Cloud Portal, (EETACP). In this paper, we showed the high level conceptual architecture for tracking power generation from PV solar system for real-time energy metering. The objective function is to help clients (location users) maximize energy and operational savings. We simplify the overall energy management ideology via our framework. The results of the implementation will be shown in our future work for both the system hardware and software. However, this will provide an end-to-end solution from measurement to billing on the cloud thereby improving quality of power measurement information, conserve energy and reduce costs at large. In the finally analysis, the metering system will measure key historical data for current user consumption data up to the last granular interval, hourly, daily, and monthly or yearly as well as historical data both in tabular and graphical forms thus providing greater visibility and control of energy consumption, this research recommends this system to all the developing nations owing its wide range functionalities and cost effectiveness.

An effective approach to designing and construction of microcontroller based self-dispense detecting liquid dispenser

Abstract: A liquid dispenser is a system or a machine which is designed and capable of responding to an instruction or request made by the user in other to dispense a particular liquid. This paper developed a liquid dispenser leveraging microcontroller technology with added features that eliminates manual operation of the dispenser's pumps. This is achieved by the use of cup sensor in the control unit that automatically detects the presence of cups or other container. It also solve the issue of overflow of fluid due to loss of concentration by the introduction of electronic keypad which enables the users to input their desired quantity. The system code implementation was implemented with Assembly language via a notepad editor saved as .asm file. The saved file was compiled with an assembler (MIDI — 51) which generated three files; hex file, obj file and list file. The hex file was used for the simulation of the design in Proteus 7.7 professional and burning of the microcontroller for construction. The outcome at the end of the specified design period was a working prototype that was able to dispense a liquid if the user activates the button from the keypad. The results shows that cup sensor carries out its sensing functionality satisfactorily.

Characterization of hotspot coverage plan in 2.4/ 5ghz frequency band (nnamdi azikiwe university, nigeria, as a case study)

Abstract: Research and tertiary institutions today uses wireless connectivity owing to the benefits of mobility flow-awarecommunication and flexibility advantages generally. In this case, mobility computing involving the use of smartdevices, laptops, wifi-desktops, etc, largely depends on a deployed hotspot infrastructure. In particular, the physicalposition of the mobile system (and hence of the user) and the hotspot infrastructure design layout are fundamentalconsiderations for service efficiency. While previous works have focused on user position estimation, signal strengthquality and network QoS, this work leverages the contemporary challenges of network connectivity in tertiaryinstitutions in Nigeria with respect to optimal coverage and cost minimization. Using Nnamdi Azikiwe University-Unizik, Awka as testbed, we carried out a study on hotspot/WLAN IEEE 802.11 deployments while devising a costeffective coverage plan in 2,4/5GHz frequency band. A mathematical model on cost optimization for WLANHotpot project processes was developed using Linear programming, the installation procedure, coverage plan basedon specifications of the deployment hardware, and data security were covered in this work. Consequently, from themodel, we argue that with careful selection of optimization criteria in the deployment, an efficient design cost plan,and QoS, could eliminate possible trade-offs in the deployment contexts by over 95%. Keywords : Mobility, Flow-aware, Hotspot, Infrastructure, Optimization, Design, Minimization

Using Software Engineering Approach in Mitigating QoS Challenges in Mobile Communication Networks in Nigeria

Abstract: As a result of telecommunication poor Quality of Service (QoS) in Nigeria with respect to voice ,data and video services, several works have been carried out using approaches such as drive test, survey design with statistical computation techniques, modeling simulation, etc. These have been employed to carry out comprehensive evaluation and optimization of Quality of Service (QoS) of Mobile Cellular Networks in Nigeria. In this context, there are five major Key Performance Indices (KPIs) which are usually considered for the evaluation, viz: Call Setup Success Rate (CSSR), Call Completion Rate (CCR), Call Drop Rate (CDR), Call Handover Success Rate (CHSR) and Standalone Dedicated Control Channel (SDCCH). In this paper, following data collated from a recently conducted drive test KPIs, we leveraged software engineering SDLC concepts, particularly using JAVA programming language to develop an optimization drive test plant for improving QoS thresholds by service providers. A test dataset for the months of April and March 2012 was used in the drive test plant design. In this regard, the raw data set, the optimized dataset and the normalized data sets were shown in the drive test plant. Relevant flowcharts were developed and discussed in the context of the drive test plant. This work argued that with the drive test plant properly integrated into the vendors Mobile Switching Centers (MSC), the QoS thresholds by NCC will be satisfied. Consequently, this work calls for a mobile community driven responses while future work will focus on integration validations necessary to boost the performance of the KPIs in order to guarantee a better Quality of Service. Keywords : Quality of Service, Cellular, Networks, Software Engineering, Thresholds, Validations, Optimization.