Browsing by Author "Melaku, Michael"

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    The Effect of Strategic Leadership on Organizational Innovation: In Case of Selected Digital Tech Firms in Ethiopia
    (Addis Ababa University, 2021-09) Melaku, Michael; Afework, Fisseha (Assistant Professor)
    The purpose of the research was to assess the effect Strategic leadership on Organizational innovation for Digital tech companies that operate in Ethiopia. Level of Strategic leadership practices and Organizational Innovation implementations in the organizations were also assessed. Strategic Leadership dimensions of Strategic Thinking, Absorptive Capacity, Adaptive capacity and Operational efficiency were identified from literature and the impact of each on Organizational Innovation was assessed. The Digital tech companies were selected from the association (ICT-et). Systematic Random sampling was used and 192 responses were collected and analysis was done. The research employed explanatory research design. Analysis for describing, assessing relationships and explaining inference were done with the help of SPSS tool. Validity and reliability of the resulted was tested. Strategic leadership is found to be Strong and positive predictor of Organizational Innovation. All of the dimensions of Strategic leadership positively related to Organizational innovation. Adaptive Capacity of Strategic Leadership failed to significantly predict Organizational Innovation. Absorptive Capacity of Top Management is found to be the most important for Organizational Innovation. The Strategic leadership variable(s) explained 50.4% of the variation in Organizational Innovation. As Organizational innovation is critical to digital tech firms operating in dynamic environment; it is recommended that organizations work on development of Strategic leadership capabilities especially Absorptive Capacity
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    Performance analysis of 60 GHZ wireless communications for local area networks
    (Addis Ababa University, 2017-03) Melaku, Michael; Negash, Yalemzewd(PhD)
    In this thesis coverage and capacity comparisons of WLAN 60 GHz frequency in LOS and NLOS scenarios are done with its counterpart 2.4 and 5 GHz frequencies. In addition, in capacity comparison different number of MIMO antenna systems are also compared for those three frequencies. For coverage comparison, cell coverage areas with acceptable performance are simulated and radiuses of the cells are compared. On the other hand, for capacity comparison the maximum Shannon capacity are simulated and the three standards are compared by the number of mega-bit/second capacities they accomplish. For both comparisons IEEE 802.11n, 802.11ac, 802.11ad path loss models are preferred for their respective frequencies because the equations are formulated by IEEE for Wi-Fi environments that this thesis studies. The results indicate that 60 GHz in NLOS scenario has very poor coverage radius and in LOS this frequency coverage radius increased dramatically and covers well like lower frequencies. On the other hand, capacity of 60 GHz is the highest in every scenario compared to 2.4 and 5 GHz frequencies. Based on the MATLAB simulation outputs LOS scenario gives more capacity than NLOS ones on the same MIMO condition. Also as the number of antenna in MIMO systems increases, the capacity of all frequencies increases too. In addition, channel bonding for 60 GHz is also done like lower frequencies and as the number of channel bonded increases, the capacity increases proportionally. Therefore, a 60 GHz 802.11ad WLAN standard in LOS scenario is preferred to be used than 2.4 and 5 GHz frequencies to meet high data rate demanding users keeping acceptable coverage radius. In addition, maximum number of MIMO antennas with channel bonding can be used for very high data rate intensive applications. To tackle the 60 GHz LOS blockage by humans or objects issue, more than one access points at different locations or relay nodes can be used. Keywords: Coverage; Capacity; Path loss models; IEEE 802.11ad; 802.11n, 802.11ac; LOS; NLOS; MIMO; Channel bonding; and MATLAB.