Browsing by Author "Otim, Julianne Sansa"

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    Minimal Idle-Listen Centralized Scheduling in TSCH Wireless Sensor Networks
    (IEEE, 2018) Nsabagwa, Mary; Muhumuza, Joshua; Kasumba, Robert; Otim, Julianne Sansa; Akol, Roseline
    Centralized scheduling in IEEE 802.15.4e Time Slotted Channel Hopping (TSCH), uses a centralized entity to perform scheduling of nodes in cells to generate collision-free communication amongst neighboring nodes. Although many centralized scheduling algorithms have been proposed, they still suffer from idle-listening, a state in which nodes stay awake without transmitting or receiving data, which causes wastage of the limited sensor node energy. This paper proposes a minimalidle-listen centralized 6TiSCH scheduling algorithm (MILS) with the aim of minimizing idle listening amongst sender nodes. MILS is formulated as a Constraint Satisfaction Problem (CSP) problem, which schedules relay links in parallel with leaf links while maximizing the channels available in order to minimize waiting at bottleneck regions. Minimizing the number of packets in nodes close to the sink reduced delays by approximately 19% and idle-listening by 50% in MILS compared to OTF.
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    Network Densification Strategies for Automatic Weather Stations: Challenges and Opportunities for Uganda
    (IST-Africa, 2016) Nsabagwa, Mary; Byamukama, Maximus; Otim, Julianne Sansa; Okou, Richard
    Access to quality, accurate and timely weather information is important. In order to improve weather information quality and quantity, increasing the number of operational Automatic Weather Stations, also referred to in this document as densification should be prioritized. In this paper, we provide research findings of a survey conducted from November 2014 to January 2015 to ascertain the status of weather stations in Uganda. Weather station density was found to be sparse and yet many of the available weather stations were non-functional. Based on the distribution of available operational weather stations, we are proposing densification strategies including climatological zones, security and land policies. To achieve sustainability of the weather stations, we commend improving human resources aspects among other things
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    Readiness of Uganda for Analog to Digital Migration by December, 2012
    (2011) Agona, Sam; Otim, Julianne Sansa
    International Telecommunications Union (of which Uganda is a signatory) in its Geneva 2006 conference set the analog-to-digital broadcasting transition deadline for June 2015. Uganda (under the Ministry of Information and Communications Technology) set its switchover date to 31st December 2012. This paper provides a situational analysis of whether Uganda is on track or not to meet the deadline. We discuss and analyse the actions taken by broadcasters and various government agencies including the regulator in support of this transition. Based on this analysis we recommend some further measures to both government and consumers to further enhance the chances of Uganda successfully meeting the deadline