Browsing by Author "Seid, Ahmed"

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    Comparative Analysis of Non-Blind Algorithms on the basis of Sidelobe Level for Smart Antenna System
    (Addis Ababa University, 2018-07) Seid, Ahmed; Murad, Ridwan (PhD)
    From time to time the need for good quality communication is required in different aspects of life. Many challenges can face service providers for implementing different communication facilities. One of these great challenges is the limitation of available radio frequency. So it is mandatory to use the scarce resource most efficiently in parallel with providing good quality of service for the customers. One of the way, for efficient utilization of limited radio frequency (RF) spectrum is to use smart antenna system. Smart antenna radiates not only narrow beam towards desired users exploiting signal processing capability but also places null towards interferers, thus optimizing the signal quality and enhancing capacity. The efficiency of the smart antenna can depend on different parameters like angle of separation between the desired and the interferer signal, the number of elements of the array and the spacing between the array elements. Different researches showed that the performance of smart antenna can be improved by using an array with a relatively large number of elements having an optimum spacing between them with a relatively large angle of separation between the desired and the interferer signal. The central aim of this thesis work is comparing the performance of smart antenna in terms of reducing radiation in unintended direction. This is achieved by using an algorithm that produces lower sidelobe level in the radiation pattern of the antenna. Comparative analysis of three nonblind algorithms, Least Mean Square (LMS), Sample Matrix Inversion (SMI) and Recursive Least Square (RLS), on the basis of Sidelobe Level (SLL) is studied in this thesis work. Smart antenna incorporates these algorithms to calculate complex weights according to the signal environment. Simulation results reveal that all the three algorithms have their own beamforming characteristics. But the LMS produces lower sidelobe level as compared to the other two algorithms. Therefore, the LMS algorithm is found the most efficient because of its simplicity, lower complexity and sidelobe level for communication through a flat fading channel. In addition, as the number of elements increases, the sidelobe level of array factor pattern decreases for the case of LMS algorithm.
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    Effect Of Outsourcing Non-Core Business Activities On Organizational Performance In The Case Of Ethiopian Commodity Exchange (ECX)
    (Addis Ababa University, 2019-06) Seid, Ahmed; Beyene, Abeba (PhD)
    In the current dynamic business world, organizations are always in searching different strategy to enhance their organizational performance and outsourcing becomes one of the widely embraced business strategies. However, in spite of the increasing trend in outsourcing arrangements, there are inadequate literature underpinnings on how outsourcing non-core business activities affect organization performance in different sector and the same is true in ECX. In order to bridge that gap this research sought to study the effects of outsourcing noncore business activities on organization performance in ECX. The researcher used descriptive and inferential research design method in carrying out his study. The study targeted a population of 682 staff from 11 departments. The researcher used stratified sampling method to pick sample respondents. Data was collected from primary sources through survey method by use of questionnaires and interview of the top level management. The data was quantitatively analyzed based on research objectives by using of statistical package for social sciences (SPSS) version 20 software. Both correlation and regression analysis were done. The study findings revealed that, though all of the dimensions of outsourcing non-core business practices have statistically significant positive relationship with organizational performance, service quality and communication was found to have no statistically significant predictive power on organizational performance of ECX, while the remaining two dimension, cost reduction and employee commitment, have found to have a statistically significant predictive power on organizational performance of ECX. Based on the study findings, the researcher recommended that: ECX should be more strict in following the deployment of committed outsource staff by designing competency framework which can ensure employees commitment and that can be strictly followed and meet by the outsource company in deploying employees which provide the outsourced noncore business activity of the Exchange, and ECX should not outsource an activity until they have confirmed that the service provider is capable of handling the activity with minimum reasonable cost in the way that can meet cost reduction objective of outsourcing
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    EFL Teachers' Practice of the Continuous Professional Development (CPD) Programme / Witfi Specia( 1?§ference to Some Serected Secane( Cyere Primary Scfioors in (j)essie/
    (2008-06) Seid, Ahmed; Alemayehu, Tebebe (Ato)
    The main objectives of this study were to investigate EFL teacher perception of the CPD pogramme and the practices of the CPD facets in actual classroom. The research participants were English language teachers in second cycle primary sch ools (Grade 7-8) attending the CPD programme, a professional development programme for all teachers . Questionnaire, interview, classroom observation and document analysis were mainly used as da ta collection instruments. Sixty-two teach ers responded to the questionnaire, ten teachers were interviewed, thirty -two classrooms lesson were observed, sixteen lesson plans and mark lists, eight por tfolios and action research document were analyzed. The questionnaire and classroom observations data were analyzed usmg descriptive statistic, while the other data were analyzed qualitatively and presented using a n a rrative process. The results indicated that EFL teachers had fairly good perceptions about CPD programme. Their perceptions about teacher development were altered and their knowledge increased despite the variations according to age, experience and qualification. On the other hand, EFL teacher had dissatisfaction with course content and orga nization and delivery vs good perceptions about CPD. There was also a discrepancy between their espoused beliefs about the practice of CPD facets and their actual practices. It was concluded th a t EFL teachers perceptions were altered, and their knowledge increased, however, increased in knowledge did not lead to change in their classroom practice.
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    Gis and Remote Sensing Integraterd Malria Risk Mapping in Dembia Woreda, Northern Ethiopia,
    (Addis Ababa Universty, 2007-07) Seid, Ahmed; Murth, K.S.R (PhD)
    Every year, malaria continues to claim over a million lives around the globe. Attempts have been made to control the disease by eliminating the parasite. However, un known spatial distribution of mosquito known to cause malaria, eradication of the parasite remains a daunting task. As a result, increased efforts and resources have been channeled towards finding ways of minimizing the disease. There for this investigation is aimed to contribute the concept and methods of the innovative development and application of GIS and RS regarding malaria prevalence in Dembia Woreda. The input data are based on the geospatial factors including climatic aspects, social aspects and Topographic aspects from primary & secondary data. After words The malaria hazard analysis was computed using multi criteria evaluation (MCE). To run MCE, the selected environmental factors such as topographic factors (elevation, , and flow distance to stream, land use/ land cover and aquatic bodies were developed and weighted. Then weighted overlay technique was computed in ArcGIS9.1 Model Builder to generate malaria hazard map. For vulnerability analysis, health station location in Spatial Analyst/ module was used to generate factor maps. For element at risk, land use land cover map was used to generate element at risk map. To generate malaria risk map of the woreda, land use land cover map which is the element at risk in the woreda, the vulnerability map and the hazard map were overlaid using weighted overlay analysis technique in ArcGIS9.1 environment. The final out put based on this approach is a malaria risk map, which is classified in to 3 classes including, High-risk area, moderate risk area and low risk area. This help to plan valuable measures to be taken in early warning, monitor, control and prevent malaria epidemic
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    In Partial fulfillment of the equirements for the Degree of master of arts in management of marketing (education)
    (Addis Ababa Universty, 2010-06) Seid, Ahmed; Mekonen, Worku (PhD)
    These days most service organizations are realizing the significance of customer centered philosophies. One of the key challenges for them is how they manage service quality, which holds a great importance for customer satisfaction. The purpose of this research was to identify the gap between customers' expectations and their actual perception of the service performance of Alpha University College, College of Distance Studies thereby measuring the gap between these elements in order to identify the level of the service quality. A questionnaire for this investigation is addressed to a sample population of 31180 and sample size of 380. Out of the 380 questionnaires distributed, 320 of them were returned which resulted in a response rate of 84.2% which was administered in 6 branches with relatively larger number of clients (learners). The sampling procedure used was a nonprobability and adopted purposive stratified sampling technique. The measurements used were based on the widely accepted SERVQUAL model. A descriptive statistical analysis (mean and percentage) was used to see the gap between clients actual perceptions and their expectations. The data were analyzed using both quantitative and qualitative method. A computer data storage program, the Spss was employed for the quantitative data and a critical analysis was made to refine the qualitative ones. Conclusion with remarks was shown that customers' perceptions were consistently lower than their expectations especially in the empathy dimension. The most important focal point for competitive advantage is shown in the responsiveness dimension. Recommendations were forwarded in the areas of employee empowerment, provision of guidance and counseling for distance learners; creating efficient distribution system; establishment of sound record management system; and the need for a continuous market research to improve service quality and to measure and evaluate clients perceptions towards the level of service quality of the institution.
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    In partial fulfillmento f the requirements for the degree of master of arts in management of farketing education
    (Addis Ababa Universty, 2010-06) Seid, Ahmed; Mekonen, . Worku(PhD)
    These days most service organizations are realizing the significance of customer centered philosophies. One of the key challenges for them is how they manage service quality, which holds a great importance for customer satisfaction. The purpose of this research was to identify the gap between customers' expectations and their actual perception of the service performance of Alpha University College, College of Distance Studies thereby measuring the gap between these elements in order to identify the level of the service quality. A questionnaire for this investigation is addressed to a sample population of 31180 and sample size of 380. Out of the 380 questionnaires distributed, 320 of them were returned which resulted in a response rate of 84.2% which was administered in 6 branches with relatively larger number of clients (learners). The sampling procedure used was a nonprobability and adopted purposive stratified sampling technique. The measurements used were based on the widely accepted SERVQUAL model. A descriptive statistical analysis (mean and percentage) was used to see the gap between clients actual perceptions and their expectations. The data were analyzed using both quantitative and qualitative method. A computer data storage program, the Spss was employed for the quantitative data and a critical analysis was made to refine the qualitative ones. Conclusion with remarks was shown that customers' perceptions were consistently lower than their expectations especially in the empathy dimension. The most important focal point for competitive advantage is shown in the responsiveness dimension. Recommendations were forwarded in the areas of employee empowerment, provision of guidance and counseling for distance learners; creating efficient distribution system; establishment of sound record management system; and the need for a continuous market research to improve service quality and to measure and evaluate clients perceptions towards the level of service quality of the institution.