Browsing by Author "Worku, Mesfin"

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    Amharic Document Image Retrieval Without Explicit Recognition
    (Addis Ababa University, 2009-06) Worku, Mesfin; Meshesha, Million (PhD); Inkpen, Diana (PhD)
    Retrieval of the stored information is a key issue. Especially image retrieval needs an emphasis , because the nature of the data is complex and difficult to retrieve . There are many problems to be studied in the area of image retrieval. From these , Document Image Retrieval is one of the issues that have to be given attention Document retrieval can use either a textual-based retrieval system or animate based retrieval system. Document image retrieval system can also be done in two ways: recognition-based document image retrieval or document image retrieval without explicit recognition Currently , little has been done on the Amharic document retrieval systems . The Amharic text retrieval systems which are covered by the researchers considered limited Amharic documents that are available only in hardcopy format The proposed system incorporates document images and user queries . The document image is preprocessed , segmented at word le vela and the feature of each word is extracted . Then the textual query is rendered to convert into an image query, preprocessed , segmented and the feature is extracted . The technique used for feature extraction considers the word shape analysis . The extracted feature of the image query is matched with the feature of the document images , at word level using Euclidean and cosine similarity measures . Finally relevant document images are retrieved in ranked order in response to the given query. To verify the validity of the approach proposed , experiment is carried out on 121 scanned Amharic documents that are selected from printed legal documents and news items. The data retrieval effectiveness is measured using retrieval measures such as precision , recall and F-Score . The experimental results confirmed the validity of the model for retrieving relevant document images from the collection of scanned document images.
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    Amharic Document Image Retrieval without Explicit Recognition
    (Addis Ababa University, 2009-06) Worku, Mesfin; Meshesha, Million (PhD)
    Retrieval of the stored information is a key issue. Especially image retrieval needs an emphasis, because the nature of the data is complex and difficult to retrieve. There are many problems to be studied in the area of image retrieval. From these, Document Image Retrieval is one of the issues that have to be given attention. Document retrieval can use either a textual-based retrieval system or an image-based retrieval system. Document image retrieval system can also be done in two ways: recognition-based document image retrieval or document image retrieval without explicit recognition. Currently, little has been done on the Amharic document retrieval systems. The Amharic text retrieval systems which are covered by the researchers considered limited Amharic documents that are available only in hardcopy format. The proposed system incorporates document images and user queries. The document image is preprocessed, segmented at word level and the feature of each word is extracted. Then the textual query is rendered to convert into an image query, preprocessed, segmented and the feature is extracted. The technique used for feature extraction considers the word shape analysis. The extracted feature of the image query is matched with the feature of the document images, at word level using Euclidean and cosine similarity measures. Finally relevant document images are retrieved in ranked order in response to the given query. To verify the validity of the approach proposed, experiment is carried out on 121 scanned Amharic documents that are selected from printed legal documents and news items. The data retrieval effectiveness is measured using retrieval measures such as precision, recall and F-Score. The experimental results confirmed the validity of the model for retrieving relevant document images from the collection of scanned document images.
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    Bacteriological Profile of Locally Prepared Fresh Fruit Juices in Hawassa Town, Southern Ethiopia
    (Addis Ababa University, 2011-05) Worku, Mesfin; Monga, D. P.(PhD); Gebre-Selassie, Solomon(PhD)
    Background: - Fresh fruits are essential components of the human diet and there is considerable evidence of the health and nutritional benefits associated with the consumption of fresh fruits. However, during processing contamination from raw materials, equipment or food handlers could be easily transferred to the final product of fruit juices resulting foodborne illness. Most of the juice venders in Hawassa prepare avocado, papaya, mango, and pineapple juices. Common bacterial illnesses associated with contaminated fruit juices are staphylococcal food poisoning, Salmonellosis, shigellosis and diarrhea associated with enterotoxogenic E. coli. Objective: - The aim of the study was to assess the bacteriological quality of the locally prepared unpasteurized fruit juices and the hygienic conditions of preparation sites. Method: - A cross sectional study was conducted from November 2010 to January 2011 in Hawassa town using structured Questionnaire to asses source of fruit and processing of fruit juices and Bacteriological analysis. i.e. the sufficient amount of the specimen of avocado, papaya, mango and pineapple juices were collected in aseptic manner and kept in ice box and transported to Hawassa University Health Science College Referral Hospital. Finally, the samples were appropriately diluted and inoculated on Nutrient agar to determine the total Viable Count, on Violet Red Bile Agar (VRBA) to determine total coliform count and on Mannitol salt agar to determine total staphylococcal count. Furthermore pathogenic bacteria such as Staphylococcus aureus, Salmonella, and E. coli were isolated and identified. Results: - A total of 120 locally prepared fresh fruit juice samples were collected. Among these juice samples, the total viable count of 38(31.67%) was found to be above Gulf region standards (5.0x105cfu/ml) and, the total coliforms count of 93(77.5%) were shown to be above Gulf region standard (100 cfu/ml). Out of 98 growth on MSA, 11 (11.22%) were positive for Staphylococcus aureus and these positive samples were above the Australian standard. Seven of total samples were positive for thermotolerant E. coli and three of the total samples were shown to contain Salmonella species. Moreover, all venders obtained fruit from the open market and only one vender stored fruits in refrigerator. Conclusion and recommendations: - According to the current study, the results may be attributed to contamination during either harvesting of fruits or processing and handling of fresh fruit juices. Therefore, regular supervision and training about harvesting fruit, safe processing, and handling of fruit juices and hygiene of venders can improve the quality of fresh fruit juices. Key Words: Bacteria, contamination, locally prepared fresh fruit juice
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    Exploring Factors Affecting Knowledge Transfer Process in Information System Outsourcing at Ethio Telecom
    (Addis Ababa University, 2017-06-09) Worku, Mesfin; Beshah, Dr. Tibebe
    Inter-organizational knowledge transfer is of central interest both as an academic topic and in business practice. However, despite the attention given to the importance of this subject from different perspectives in various contexts, little is known about how knowledge is transferred from vendors to clients in information systems outsourcing. This research attempts to address this shortage by providing an analysis of the key factors which facilitate or inhibit knowledge transfer success in IS outsourcing at Ethio telecom. This study employed a qualitative, single case study approach. Data was collected from Ethio telecom’s IS Division. Through semi-structured interviews, this study explored the perspectives of the internal IS staff on their experience of knowledge transfer and learning from vendors through various IS outsourcing projects. Written and electronic documentations as well as participant observations also served as important triangulation and complementary sources in understanding the phenomenon being studied and as a means of gaining additional perspectives and further insights on key issues. The empirical evidence demonstrated that there are four sets of factors which facilitate or inhibit knowledge transfer success in IS outsourcing. These are: knowledge (knowledge tacitness and knowledge complexity), client (learning intent, absorptive capacity and motivation), vendor (vendor capability, vendor credibility and vendor openness), relationship (relationship quality, relationship duration, relationship governance and organizational distance). Ethio telecom’s IS Division staff intention to learn and absorptive capacity are more important factors in transferring knowledge within short period of time from vendors’ employees and made them less dependent on vendors. The study also revealed that, Ethio telecom IS division currently uses two main types of processes for knowledge transfer, namely structured and unstructured. Transferring of tacit knowledge highly dependent on unstructured process.
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    Exploring Factors Affecting Knowledge Transfer Process in Information System Outsourcing at Ethio Telecom
    (Addis Ababa University, 2017-06-07) Worku, Mesfin
    organizational knowledge transfer is of central interest both as an academic topic and in business practice. However, despite the attention given to the importance of this subject from different perspectives in various contexts, little is known about how knowledge is transferred from vendors to clients in information systems outsourcing. This research attempts to address this shortage by providing an analysis of the key factors which facilitate or inhibit knowledge transfer success in IS outsourcing at Ethio telecom. This study employed a qualitative, single case study approach. Data was collected from Ethio telecom’s IS Division. Through semi-structured interviews, this study explored the perspectives of the internal IS staff on their experience of knowledge transfer and learning from vendors through various IS outsourcing projects. Written and electronic documentations as well as participant observations also served as important triangulation and complementary sources in understanding the phenomenon being studied and as a means of gaining additional perspectives and further insights on key issues. The empirical evidence demonstrated that there are four sets of factors which facilitate or inhibit knowledge transfer success in IS outsourcing. These are: knowledge (knowledge tacitness and knowledge complexity), client (learning intent, absorptive capacity and motivation), vendor (vendor capability, vendor credibility and vendor openness), relationship (relationship quality, relationship duration, relationship governance and organizational distance). Ethio telecom’s IS Division staff intention to learn and absorptive capacity are more important factors in transferring knowledge within short period of time from vendors’ employees and made them less dependent on vendors. The study also revealed that, Ethio telecom IS division currently uses two main types of processes for knowledge transfer, namely structured and unstructured. Transferring of tacit knowledge highly dependent on unstructured process.