Browsing by Author "Nombo, Josiah"

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    Collaborative Development and Utilization of iLabs in East Africa
    (IGI Global, 2012) Mwikirize, Cosmas; Tumusiime, Arthur Asiimwe; Musasizi, Paul Isaac; Tickodri-Togboa, Sandy Stevens; Jiwaji, Adnaan; Nombo, Josiah; Maiseli, Baraka J.; Sapula, Teyana; Mwambela, Alfred
    Since 2005, Makerere University and the University of Dar es Salaaam have taken definitive steps to-ward the development and utilization of iLabs. This chapter presents the iLabs experiences of the two East African universities. The experiences presented here are characterized by: institutionalization of developer teams, development of ELVIS-based iLabs, staff & student exchanges, and utilization of iLabs to support curricula. The two universities have also undertaken to setup iLabs communities at peer universities and other higher institutions of learning in East Africa.
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    Collaborative Development and Utilization of iLabs in East Africa
    (2011) Mwikirize, Cosmas; Tumusiime, Arthur A.; Musasizi, Paul I.; Tickodri-Togboa, Sandy S.; Jiwaji, Adnaan; Nombo, Josiah; Maiseli, Baraka; Sapula, Teyana; Mwambela, Alfred
    Since 2005, Makerere University and the University of Dar es Salaaam have taken definitive steps to-ward the development and utilization of iLabs. This chapter presents the iLabs experiences of the two East African universities. The experiences presented here are characterized by: institutionalization of developer teams, development of ELVIS-based iLabs, staff & student exchanges, and utilization of iLabs to support curricula. The two universities have also undertaken to setup iLabs communities at peer universities and other higher institutions of learning in East Africa.
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    A Grey Level Fitting Mechanism based on Gompertz Function for Two Phase Flow Imaging using Electrical Capacitance Tomography Measurement Systems
    (2014) Nombo, Josiah; Mwambela, Alfred; Kisangiri, Michael
    Electrical Capacitance Tomography (ECT) is an image generating system based on soft field sensory system. The preferred Linear Back Projection (LPB) reconstruction algorithm for multi-phase measurement has blurring effect on the image generated. These two inherent factors, among others, affect the quality of image generated from ECT systems. Introducing fitting in the image generation process is one the solutions to improving its quality. In this article an alternative fitting mechanism based on the Gompertz function has been developed and evaluated. Comparative analysis results shows improvement on the spatial quality of images generated, in terms of minimum relative image and distribution errors, maximum correlation coefficient, and at relatively no additional computational cost. The mechanism is more effective for annular than stratified flow data hence complimenting the weakness of Xie method for annular flow.
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    Performance Analysis of Grey Level Fitting Mechanism based Gompertz Function for Image Reconstruction Algorithms in Electrical Capacitance Tomography Measurement System
    (2015) Nombo, Josiah; Mwambela, Alfred; Kisangiri, Michael
    This paper analyses the performance of grey level fitting mechanism based on Gompertz function used in Electrical Capacitance Tomography measurement system. In order to evaluate its performance, the data fitting mechanism has been applied to common image reconstruction algorithms which include; Linear Back Projection, Singular Value Decomposition, Tikhonov Regularization, Iterative Tikhonov Regularization, Landweber iteration and Projected Landweber iteration. Images were reconstructed using measured capacitance data for annular and stratified flows, and qualitative and quantitative evaluation were done on the reconstructed images in comparison with respective reference images. Results show that this grey level fitting mechanism is better in terms of improving image spatial resolution, minimizing relative image error and distribution error and maximizing correlation coefficient.