Browsing by Author "Kondoro, Aron"

Now showing 1 - 8 of 8
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    Accessibility and Usability of Government Websites in Tanzania
    (The African Journal of Information Systems, 2017-09-28) Mtebe, Joel S.; Kondoro, Aron
    The government of Tanzania has been embracing information systems specifically websites to enlarge access to government services, lower administrative costs, and to increase public participation in decision making. As a result, almost every ministry, department, and agency (MDA) has developed a unique website. However, most of existing websites were developed without sufficiently considering users’ needs which indicates that they do have some usability and accessibility problems. This study used the SortSite tool to evaluate accessibility and usability of government websites taking a sample of 22 websites. The report from the SortSite tool was then checked against the W3 WCAG accessibility standards and Section 508 guidelines, and usability issues based on the US Federal (Usability.gov) guidelines. The results show that most of websites have many accessibility and usability problems that hinder citizens from using them. This study provides recommendations on how to improve usability and accessibility of these websites.
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    Adopting Renewable Energy in Tanzania: Opportunities and Challenges
    (IFIP-WG8.9 Enterprise Information Systems, 2017-10-19) Shililiandumi, Naiman; Rwegasira, Diana; Kalinga, Ellen; Kondoro, Aron; Dhaou, Imed Ben; Kwame, Ibwe; Kelati, Amleset; Mvungi, Nerey H.; Tenhunen, Hannu
    Abstract: Solar energy is one of the sources of power that is obtained in a natural way. Many countries, especially developing countries are making use of the renewable energy for the benefit of their communities, however, the issue of counting the benefit of using solar energy, mainly on cost bases remained undefined to many users/consumers at their premises. In this paper, the research on how thermal solar power can effectively be used in the house to minimize the cost, its requirements and the payback money upon investing on solar power is being addressed. The scenario was based on comparing the cost spends by the residential house with thermal solar power and another house without thermal solar power. The analysis shows that the electric energy saving per year when using solar power is about 51.52% for houses and flats, with payback for the investment cost within 3-4 years. The paper also discussed the building blocks for low-cost ICT infrastructures to deploy solar technologies.
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    Communication and Security Technologies for Smart Grid
    (IGI Global, 2017-07) Dhaou, Imed Ben; Kondoro, Aron; Kelati, Amleset; Rwegasira, Diana; Naiman, Shililiandumi; Mvungi, Nerey H.; Tenhunen, Hannu
    Smart grid is a new paradigm that aims to modernize the legacy grid. It is based on the integration of ICT technologies, renewable energy and advanced algorithms for management and optimization. Smart grid is a system of systems in which communication technology plays a vital role. Safe operations of the smart grid need careful design of the communication protocols, cryptographic schemes and computing technology. In this article, we survey the recently proposed algorithms, technologies, protocols and architectures for secure smart grid communication network.
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    A Framework for Load Shedding and Demand Response in DC Microgrid using Multi Agent System
    (FRUCT ASSOCIATION, 2017-11) Rwegasira, Diana; Dhaou, Imed Ben; Anagnoston, Anastasia; Kondoro, Aron; Shililiandumi, Naiman; Kelati, Amleset; Taylor, Simon J.E.; Mvungi, Nerey H.; Tenhunen, Hannu
    This paper presents a framework of load shedding experiment for a DC Microgrid using Multi-Agent System (MAS). The microgrid uses solar panels as source of energy to serve a community without access to electricity. The generated framework includes modelling of solar panels, battery storage and loads for effective control and better operation. The loads are classified as critical and non-critical loads. The agents are designed in a decentralized manner which include solar agent, storage agent and load agent. The load shedding experiment of the framework is mapped with the manual operation done at Kisiju village, Pwani, Tanzania. The results of the experiment focus on using accurate solar and PV panels which provide: (i) the multi agent system that runs in the DC microgrid, (ii) the controlling and monitoring of power to be used for critical and non-critical loads and (ii) the management power in the production process through selling extra power from an individual load to the storage
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    Investigating Secure Implementation of Government Web based Systems in Tanzania
    (2018-08) Kondoro, Aron; Mtebe, Joel
    The government of Tanzania has been adopting various webbased systems to improve public services to its citizens. With these systems being online, security and privacy have started to play a key role. Many systems use HTTP over Transport Layer Security (HTTPS) to secure their web front ends. However, many HTTPS implementations still suffer from several security and privacy problems. This study investigated the security of HTTPS implementations government webbased systems in Tanzania. Using a sample of 74 government web-based systems, an automated tool testssl was used to check for well-known HTTPS/SSL vulnerabilities, configuration mistakes, support for outdated and vulnerable protocols, and adherence to HTTPS best practices. Results show that 43% of web systems have serious HTTPS security issues due to vulnerabilities, and configuration mistakes. These issues can lead to system com- promise, disclosure of sensitive information, and loss of privacy to citizens. The study highlights these security issues that may have been overlooked and offers suggestions that may prevent them in the future
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    A Multi-Agent System for Solar Driven DC Microgrid
    ((ICCEREC, 2017-09) Rwegasira, Diana; Dhaou, Imed Ben; Kondoro, Aron; Shililiandumi, Naiman; Kelati, Amleset; Mvungi, Nerey H.; Tenhunen, Hannu
    This paper proposes a Multi-Agent System (MAS) modeling and control architecture for a solar driven DC microgrid. The microgrid consists of solar system as a source of power, energy storage system, critical and non-critical houses (loads) with their own solar and storage as well. For the proposed MAS an individual house can have the ability to sell extra power to the main solar source. The main solar source can generate power and provide to the community when needed. The MAS also controls and monitors an automatic load shedding technique to disconnect non critical loads when there is a deficiency of power supply to the system. The validity of the objectives are demonstrated by agent based system which runs under REPAST simulation tool which used successfully three loads: hospital and two houses during simulation
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    Simulation Tools for a Smart Micro-Grid: Comparison and Outlook
    (FRUCT ASSOCIATION, 2017-11) Kondoro, Aron; Dhaou, Imed Ben; Rwegasira, Diana; Kelati, Amleset; Shililiandumi, Naiman; Mvungi, Nerey H.; Tenhunen, Hannu
    Smart micro-grids are low voltage autonomous power systems that integrate information and communication technologies with electrical energy systems. In order to realize this, it is important to find the optimal configuration of components that will result in the most efficient and sustainable DC micro-grid. To facilitate this analysis, a number of modeling and simulation tools for power systems have been proposed. However, in practice, these tools differ widely in the features they provide and the implementation approach. In this paper, we compare the strength and weakness of four popular simulation tools for power systems: Anylogic, Repast, GridLAB-D and RAPSim. We propose a simplified model of a Photovoltaic (PV) panel for smart micro-grid which is implemented in all tools. We determine the strength and weaknesses of each tool based on ease of implementation, accuracy of the final model, and the ability to view results. We also recommend further improvements for existing tools
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    Using SMS Mobile Technology to Assess the Mastery of Subject Content Knowledge of Science and Mathematics Teachers of Secondary Schools in Tanzania
    (Educational Assessment, Evaluation, and Research, 2015-11-20) Mtebe, Joel S.; Kondoro, Aron; Kissaka, Mussa M.; Kibga, Elia
    Sub-Saharan Africa is described as the second fastest growing in mobile phone penetration in the world more than in the United States or the European Union. Mobile phones have been used to provide a lot of opportunities to improve people’s lives in the region such as in banking, marketing, entertainment, and paying for various bills such as water, TV, and electricity. However, the potential of mobile phones to enhance teaching and learning has not been explored. This study presents an experience of developing and delivering SMS based quiz questions used to assess mastery of subject content knowledge of science and mathematics secondary school teachers in Tanzania. The SMS quizzes were used as a follow up support mechanism to 500 teachers who participated in a project to upgrade subject content knowledge of teachers in science and mathematics subjects in Tanzania. Quizzes of 10-15 questions were sent to teachers each week for 8 weeks and the results were analyzed using SPSS. Results show that teachers who participated in chemistry and biology subjects have better performance compared to those who participated in mathematics and physics subjects. Teachers reported some challenges that led to poor performance, This research has several practical implications for those who are implementing or planning to use mobile phones in teaching and learning especially in rural secondary schools in sub-Saharan Africa