School of Technology
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Item Generic model for estimating wlan infrastructure costs(kca university, 2013) Kebut, Vancy J.In setting up LAN or WLAN infrastructure, the business has to make careful decisions on the choice of LAN or WLAN infrastructure to be laid for them to have a robust LAN infrastructure as well as have cost effective solution. (Cawley & Harman, 2005) has said that: “there is need for a tool enabling estimating LAN infrastructure costs that would lead to cost effective decisions. It will also provide an opportunity to compare network infrastructure choices which can be deployed in a network.” (p.2). There exist two cost estimation models; Tolly group – 2000 and TIA FOLS – 2005 which is always updated. From the Tolly group and TIA FOLS models, one can be able to estimate costs of having fiber on the vertical and either UTP or fiber on the horizontal using the standardized architectures; distributed or hierarchical star, FTTD/All-fiber and FTTE. Due to the advancement of technologies, there is also need for a tool to estimate the costs of WLAN infrastructure. The WLAN cost estimation tool developed in this thesis can be used by WLAN users or designers to estimate costs of either hierarchical star design, centralized or FTTD design or FTTE design and compare between costs among the three architectures. It can be used to identify which of the standard-compliant architectures is cost effective without any compromise to the computer network performance. Therefore computer network users or designers are able to make decisions as to which standard compliant architecture is the cost optimal solution for their LAN.Item A road map model towards unified software requirements engineering process management: System dynamics approach(kca university, 2018) Njoroge, Githinji DavidThe Success of software projects heavily and critically depends on the effectiveness of Requirements Engineering (RE) and the Requirements Engineering Process Improvement (REPI). This research study adopts and applies System Thinking/System Dynamics (SD) approach to the complex and dynamic REPI process. The research paper presents a unified model for improving quality software and delivery. Review of the state-the-art practice in RE and REPI literature indicates six categories of problem that motivated the research work reported in this paper. Poor RE and REPI processes make projects to fall behind schedule, encounter budget over-shoots and poor software specification and development. The research study seeks to understand these problems from a feedback control point of view due to lack of quantitative data and agreement on the nature of deficiencies in the current RE and REPI processes. The model developed therefore not seen to be an answer to the existing RE and REPI problems, but as an aid tool for research, researchers and RE stakeholders to advance a deeper understanding needed to answer them. The study identifies several strategies for performing REPI research from empirical to paradigm shift and isolates hot areas of research that address RE and REPI needs for effective software product delivery. Development of the model contributes to research by providing foundation for theory building on RE and RE improvement management of software projects in learning institutions, RE, REPI and software stakeholders.Item Implementation of a universal public Wi-Fi access(kca university, 2013) Muango, Charles O.As demand for Internet grows and its usage keeps evolving, there is need to create an avenue through which users can have access to this facility wherever they are without subjection to ISP providers; this will facilitate economic growth, job creation, and global competitiveness. To address this today depends on incremental solutions that increase and guarantee connectivity without any hassle of having to purchase DTE/DCE (modems). The objective of this study was to implement a universal public wireless Internet access by use of the Wi-Fi enabled feature on laptops and other devices today. This will ensure drive to innovation, deliver seamless connectivity and optimize network use. This study evaluated the effectiveness of the Internet services offered by ISPs (Safaricom, Airtel, Orange and YU). The results from this study revealed that Network coverage was the key reason for subscription to an ISP by a client among others such as cost, equipment (Modem) availability and spread of bandwidth for purchase. Based on the study, a Web based solution was developed from which all transactions pertaining to online purchase of bundles (based on the amount of funds one has in his/her account) and connecting to the Internet everywhere through a Public Wi-Fi would be achieved. This is the uniqueness of the developed solution in this work. Finally, conclusion and recommendations that will help provide better Universal Public Wi-Fi Access have been discussed.Item Improving performance of 3G mobile data offloading through WiFi networks by data caching(kca university, 2013) Gichuhi, Cecilia WambuiIn the recent years there has been a skyrocket rise in mobile data usage especially due to the large number of smartphones in use. This has led to a rigorous traffic overloading in cellular networks and the trend is expected to continue. It is imperative that architectures are put in place to handle this data. Use of Wifi to offload data has been considered as one of the immediate solutions. In this paper I propose Wifi caching to offload mobile data. Tests were carried out using OMNet++ a discreet event simulator. From the experiments done it can be seen that the throughput is best when the number of hosts are about 3 and 10. Further increase of hosts above 10 hosts then the throughput and efficiency begin to go down. However when LRU caching is implemented the general throughput is slightly lower than when caching is not implemented which is a concern, and was not the expected result. The user request latency is slightly higher after caching. The AP caching model can be tested using other different caching algorithms to see which one would give best results.Item A tool for predicting loss-to-follow-up among people living with HIV at Busia border(kca university, 2017) Juma, Denice OHuman Immuno-Deficiency Virus (HIV) and Acquired Immune Deficiency Syndrome (AIDS) are a global emergency. Infection with HIV can lead to poor health, loss of lives, increased number of orphans and reduced national productivity. In Kenya and Uganda, National AIDS & STI Control Programme (NASCOP) and the Uganda AIDS Commission (UAC) respectively are promoting combination of approaches for HIV prevention with the key populations. Studies have revealed that 1.5 million people live with HIV with a 5.9% adult HIV prevalence. There are an estimated 78,000 new HIV infections with 36,000 aids related deaths and 59% adults on antiretroviral treatment (AVERT 2016). Complex socio-cultural, economic, and health-system factors inhibit excellent patient retention. Better tracking, enhanced social support, and regular adherence counseling in addressing stigma, and alternative healing options are needed. Intervention strategies aimed at changing clinic routines and improving patient–provider communication could address many of the identified barriers (Tiruneh et al. 2016). The objective of the study is to develop a tool to predict possible loss-to-follow-up among mobile people living with HIV/AIDS enrolled in care and treatment at the Busia border.Item A framework of wide area network (WAN) optimization(kca university, 2014) Ribiro, N. SThe fast increasing adoption of information technology and increased digitization has led to generation of large data which needs to be sent across the network. The world is becoming a small globe by the essence of networking and exchange of real information is paramount in many corporate agencies such as banks whose clients access their services throughout the country. Fast and consistent application response across the LAN and WAN help in ensuring uncompromising access to mission critical applications and services and enable high-performance businesses to use their applications to accelerate a competitive advantage. This research covered how LAN and WAN optimization can be achieved through application of various existing technologies which are both on paper and practice. This was significant in establishing trends for emergent technology in this field of information and computer technology. LAN and WAN optimization ensures that the limited available resources are used effectively to ensure effective and efficient performance of the resources which are accessed through the network.Item A Model for selecting security protocols for wireless sensor networks(kca university, 2013) Ndia, John GichukiABSTRACT The process of mapping security requirements to the most appropriate security protocol has over the time proved a great challenge. Though there are various security mechanisms designed to curb security threats, they come with various properties and therefore the choice of the best security protocol for a given application becomes quite complex. To ease the process of mapping security requirement of sensor applications to security protocol, security environments for WSNs have been defined formally. There are numerous WSNs applications being developed day to day, ranging from simple environmental monitoring e.g. collecting of temperatures in an agricultural farm to complex applications like for monitoring battle field. Therefore, this research dissertation objective was to enable selection of best security protocol that falls under a certain security class for the various existing WSNs applications and applications to be developed in the future. The research endeavored to identify and evaluate the security protocols that are practically used in WSNs and to identify the best tool to be used in simulation process, and finally to validate selection of security protocolsItem Integrating femtocells with internet protocol multimedia subsystem(kca university, 2017) Agong, Raphael WambiThe functionality of IMS was to work with wireless access technologies and other network coverage like macro cell, microcells and Femtocells. The trend of next generation networks’ evolution is towards providing multiple and multimedia services to users through ever present networks. The aim of IMS is to integrate mobile communication networks and computer networks. The internet protocol subsystem (IMS) is a framework that was specified for the 3G mobile network to provide internet protocol telecommunication services. It supports multiple access types like GSM WCDMA, CDMA2000 or Wireless Fidelity (IEEE802.11). A Femtocell allows service providers to extend service coverage indoors or at the cell edge, especially where access would otherwise be limited or not available. The Key functions of IP multimedia subsystem (IMS) are to introduce enhanced features like signal initiation protocol [SIP] (a protocol that has been devised for establishing, managing and terminating session on IP networks) in the fixed and AD HOC network infrastructures. The poor lose of signals in a an enclosed building forces communication to drop. Poor signals may be caused by poor building materials. There is no study that have been performed to addresse this problem adequatly. This study is to solve signal drops due to poor building material by integrating Femtocell with IMS.Use of Femtocells will greatly increase network capacity, coverage area, support high speed data rate and utilization of power. The focus of the study is to improve wireless signals indoors by using a Femtocell integrated with IMS. This will improve services, network capacity among other things for users and operators. Integrating a femtocell with IMS architecture will maintain the signal levels to a point that communication will not be dropped. Femtocell will improve signals by about 10% both TX and RX in an average distance of 10M between the ME and Femtocell.Item Bandwidth capacity measurement in small-scale wireless IP networks(kca university, 2013) Mwangi, Christopher K.User applications on the internet cannot beget bandwidth guarantees from the network. Therefore, it is important to measure the available capacity bandwidth as well as link capacities so that the user applications may adopt these parameters to determine the applicability of the service. For measurement of the available capacity bandwidth between devices in a wireless network, active capacity measurement methods are used. Data packets inform of packet probes are inferred into the network from the sending device. These data packets are stamped with time at the end node. The available bandwidth is analyzed from the separation with the time stamped packets as the input.Item Optimization model of internet usage among Kenyan public universities: A case study of moi university Nairobi campus(kca university, 2016) Biwott, Brian KipronoThe aim of this research is to investigate optimization of internet usage among Kenyan Public Universities- Moi University Nairobi Campus as a case study which is a necessity at this current information age where internet is the source of almost most searches compared to the traditional ways of searching through hard covered books and journals not forgetting audio-visuals majorly for educative purposes. In this study, it will provide understanding on factors that influence Internet usage among Kenyan Public Universities in Kenya; it will highlight on the key factors that play a role in the optimization of Internet use. This study will contributes to the body of knowledge in the field of ICTs in education; it will yield to a model that Kenyan Public Universities can adopt to optimize Internet use for learning and research purposes. Structured survey questionnaire will be administered to students while face-to-face interviews will be administered to ICT staffs to get insights on information search in relation to the internet usage. The study will employ a survey study that will include questionnaires to students and interviews to ICT Staffs during the data collections at Moi University Nairobi Campus