AN EVALUATION OF LEGACY 3-TIER DATACENTER NETWORKS FOR ENTERPRISE COMPUTING USING MATHEMATICAL INDUCTION ALGORITHM

In today’s internet computing, regardless of the scale of infrastructural integrations, the design Cost, QoS, powermanagement etc, largely plays a role in the choice of design. In this paper, we present the limitations of traditional DataCenter Networks (DCN) for efficient web application integration in enterprise organisations. We carried out an in-depthstudy on typical enterprise DCNs viz: University of Nigeria DCN and Swift Network DCN Lagos state, seeking to ascertainthe limitations of the traditional DCN with respect to throughput, latency, scalability, efficiency in web applicationintegration, etc in QoS context. Microtic Server and Ethereal Wireshack were employed for traffic trend observation andpacket captures on a monitoring Dell Inspiron laptop connected to the UNN DCN. The traffic graphs were captured,computed and analysed. From the results obtained, deductions were derived while articulating on the limitations of thesenetworks. Using mathematical induction theorem, we show that for any introduced network enhancer, this will enable sucha network to scale optimally. In this regard, this work opines that for large scale enterprise computing, collapsing a three tiernetwork models into a low cost two-tier model using virtualization and consolidation will be widely celebrated. These formsthe basis for our future work on a re-engineered DCN for enterprise web application integrations.Keywords: Internet, Computing, Efficiency, Application, Ethereal, Wireshack, Enterpris

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

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

CHARACTERIZATION OF HOTSPOT COVERAGE PLAN IN 2.4/ 5GHZ FREQUENCY BAND (NNAMDI AZIKIWE UNIVERSITY, NIGERIA, AS A CASE STUDY)

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, Minimizatio

3-TIER E-COMP: A NOVEL E-COMMERCE MANAGEMENT PORTAL BASED ON SECURED SDLC APPROACH

In today’s business world, there is an urgent need to develop a new approach for customer to business owner transactionssecurely. This research develops, implements, and discussed a novel 3 – Tier E-Commerce Management portal. This makesonline business very flexible and secured on the part of business owners and customers. Our proposed system seeks toreplace the conventional E-commerce models on the internet today. We argue that process logic manipulation using SecuredSoftware Development Life Cycle (SSDLCM) on Ecommerce platform is a promising scheme for studying andunderstanding script processing on the new web paradigms. In this research, we define security calculus for 3 Tier EComPwith the aim of eradicating SQL injection possibilities as well as exploiting Software as a service in a dynamic Ecommercedomain. Also, we developed a new access hierarchy for E-commerce comprising of Application layer users, designatedadministrator and super administrators in the 3 – Tier EComP. We developed a new encryption scheme based on XAMPMD5 Random Curve Cryptography (XMD5 – RCC) running on Secure Socket Layer (SSL) which protects the user andadministrators on the Ecommerce platform. The result of encryption scheme randomly generates and secures the logindetails dynamically on the server during the authentication and authorization phases. The programming was accomplishedwith PhP, and MySQL Server. The overall methodology as detailed in the body of the work could serve as good template forapplication developers and other researchers.Keywords: E-Commerce, XMD5-RCC, SSL, Platform, SSDLCM, Software, Servic

Nonlinear damper design for a vibration isolation system

In this paper, vibration transmissibility of a single-degree-of-freedom (SDOF) for a mass-springdamper system is presented. This is done with a linear damper having a configuration perpendicular to a linear vertical spring. The method is analyzed using a nonlinear frequency analysis approach. The concept of the output frequency response function (OFRF) is used to derive an explicit polynomial relationship between the system output response (relative displacement of the mass) and the nonlinear damping coefficient which is the parameter of interest. With the derived OFRF polynomial, various damping parameters were designed for desired output responses. Real-time experimental results are presented for the vibration isolation system validation with dampers orientated perpendicularly (at 90 degrees) to the linear spring. The experimental case studies are provided to demonstrate the new OFRFbased nonlinear system design and its significance in isolated vibration system applications. A force transmissibility graph showing the system output using both numerical and the OFRF methods are presented.N/