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RISS 인기검색어
- 검색키워드
- 저자 : Bulti, Dinkisa Aga (검색결과 5 건)
- 무료
- 기관 내 무료
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Optimizing Caching in a Patch Streaming Multimedia-on-Demand System
Bulti, Dinkisa Aga,Raimond, Kumudha Korean Institute of Information Scientists and Eng 2015 Journal of Computing Science and Engineering Vol.9 No.3
In on-demand multimedia streaming systems, streaming techniques are usually combined with proxy caching to obtain better performance. The patch streaming technique has no start-up latency inherent to it, but requires extra bandwidth to deliver the media data in patch streams. This paper proposes a proxy caching technique which aims at reducing the bandwidth cost of the patch streaming technique. The proposed approach determines media prefixes with high patching cost and caches the appropriate media prefix at the proxy/local server. Herein the scheme is evaluated using a synthetically generated media access workload and its performance is compared with that of the popularity and prefix-aware interval caching scheme (the prefix part) and with that of patch streaming with no caching. The bandwidth saving, hit ratio and concurrent number of clients are used to compare the performance, and the proposed scheme is found to perform better for different caching capacities of the proxy server.
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Analyzing spatial distribution and accessibility of primary schools in Bishoftu Town, Ethiopia
Dejene Tesema Bulti,Tulu Besha Bedada,Leta Getahun Diriba 대한공간정보학회 2019 Spatial Information Research Vol.27 No.2
Education is a major force in economic, social and cultural empowerment. Primary education is compulsory, and the first stage in the education system of Ethiopia, and urges the provision of accessible service. However, presently, it is unclear that how well the services have been distributed and accessed in Bishoftu town, Ethiopia. For this primary schools in the town are considered and their spatial distribution and accessibility to the residents are explored using geographic information system as a tool for analysis. Location quotient and nearest neighbor analysis have been used to analyze spatial concentration and spatial distribution pattern of the schools, respectively. Computing service areas using road network distance and population density, the spatial accessibility of the schools has been compared and contrasted with standards in planning guide. As a result, inequality of service provision between neighboring areas in the town is found and the overall spatial distribution of the schools shows a clustered pattern. In addition, 23.9% of the residents are expected to travel more than twice of the maximum standard distance, indicates the current service provision is inadequate. The limitation is due to the combined effect of population distribution, spatial variables, socio-economic, and absence of regular monitoring and evaluation. The study would support the planning efforts being made to improve service provision, and it helps the government in formulating effective policies to the context.
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Optimizing Caching in a Patch Streaming Multimedia-on-Demand System
Dinkisa Aga Bulti,Kumudha Raimond 한국정보과학회 2015 Journal of Computing Science and Engineering Vol.9 No.3
In on-demand multimedia streaming systems, streaming techniques are usually combined with proxy caching to obtain better performance. The patch streaming technique has no start-up latency inherent to it, but requires extra bandwidth to deliver the media data in patch streams. This paper proposes a proxy caching technique which aims at reducing the bandwidth cost of the patch streaming technique. The proposed approach determines media prefixes with high patching cost and caches the appropriate media prefix at the proxy/local server. Herein the scheme is evaluated using a synthetically generated media access workload and its performance is compared with that of the popularity and prefix-aware interval caching scheme (the prefix part) and with that of patch streaming with no caching. The bandwidth saving, hit ratio and concurrent number of clients are used to compare the performance, and the proposed scheme is found to perform better for different caching capacities of the proxy server.
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Evaluating land-use plan using conformance-based approach in Adama city, Ethiopia
Dejene Tesema Bulti,Negera Dinsa Sori 대한공간정보학회 2017 Spatial Information Research Vol.25 No.4
Urban land-use plan is regarded as a useful tool to achieve urban sustainable development. However, presently it is unclear that how well the Plan is being implemented and major factors contribute to the variation of its implementation in Adama city, Ethiopia. This research examines the extent to which Land-use plan of Adama city functioned from 2004 to 2014 has guided and controlled all spatial developments during planning period by measuring the degree to which actual land-use outcomes over a 10-year period conform to the Plan intention. Land-uses of the City as of 2004 and 2014 are mapped; conforming, nonconforming, and unfulfilled developments are identified through spatial overlay analysis in geographic information system environment; effectiveness of boundary containment and proposed land sufficiency are explored. The findings demonstrate that although the Plan proposed reasonable area, it has met difficulties to control and guide new spatial developments of housing land-uses followed by social services and total urban growth. The limitation is due to combined result of geographic variables, absence of regular monitoring and evaluation, lack of commitment, and political leadership influence. The study would support sustainable spatial policy and direction of spatial development with respect to sustainable urban environment.
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Bantalem Tilaye Atinafu,Fekadu Aga Bulti,Tefera Mulugeta Demelew 대한암예방학회 2020 Journal of cancer prevention Vol.25 No.1
Colorectal cancer is one of the commonest cancer types that has a great public health impact both in developed and developing countries. However, in Ethiopia, the survival status of colorectal cancer patients was not well understood. Therefore, the aim of this study was to determine the survival status and predictors of mortality among colorectal cancer patients in Tikur Anbessa Specialized Hospital, Addis Ababa, Ethiopia in 2019. The institution-based retrospective follow-up study was conducted with 621 subjects who were selected from patients registered between January 1, 2013 and December 30, 2017 with follow-up until December 30th, 2018. Data were collected from patient record review charts. A Kaplan–Meier analysis with a log-rank test, and bivariate and multivariable analysis using the Cox proportional hazard model were used. Of the 621 colorectal cancer patients who were included in the analysis, 202 (32.5%) died. The overall mortality rate was 20.3% per year (95% CI: 17.7-23.3). The overall survival was 18.1% with median survival time of 34.8 months (95% CI: 30.4-36.8). Comorbidity (adjusted hazard ratio [AHR] = 1.8, 95% CI: 1.3-2.5); stage (II [AHR = 3.8, 95% CI: 1.3-11.1], III [AHR = 8.0, 95% CI: 2.8-23.3], IV [AHR = 17.6, 95% CI: 6.1-50.7]); smoking (AHR = 1.6, 95% CI: 1.12.3); alcohol consumption (AHR = 1.5, 95% CI: 1.07-2.2); age ≥ 70 (AHR = 1.7, 95% CI: 1.02-2.9); and marital status (married [AHR = 2.4, 95% CI: 1.5-3.8], widowed [AHR = 2.4, 95% CI: 1.2-4.6], divorced [AHR = 2.0, 95% CI: 1.1-3.7]) were significant predictors of colorectal cancer mortality. It is crucial to implement early detection and screening, giving priority to rural dweller, comorbid patients and advanced stage diagnosed patients. Key Words Colorectal cancer, Survival, Mortality, Ethiopia
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