Browsing by Author "Bekele, Abreham"

Now showing 1 - 3 of 3
  • No Thumbnail Available
    Item
    Developing Design Principles for Autistic Android Application Users : the Case of English Alphabet
    (Addis Ababa University, 2021-07-05) Bekele, Abreham; Lemma, Dagmawi
    Autism Spectrum Disorders (ASD) are enduring neurodevelopmental and behavioral disorders found in early childhood. Children diagnosed with the disorder show communication, emotional, and social impairment varying from mild to severe. Over the last decade, an immense amount of research in computer science has been done on developing different computer-assisted solutions in improving the condition of children diagnosed with autism. The solutions comprise of computer, multi-touch table, smartphone-based application to improve or develop communication (verbal skills), emotional (non-verbal skills), and social interaction skills in these children. However, most of the android applications developed for autistic users are difficult to use, this is mainly due to the lack of standard usability guidelines and principles for developing android applications for autistic users. This research paper identifies design principles to tackle this issue of usability regarding android applications developed for autistic users with an emphasis on English alphabet teaching android application. First characteristics of autistic users that affect the usability of android applications are identified, then usability attributes that are related to autistic users’ characteristics are identified, and then, finally, design principles from previous literatures are revisited and the new ones are developed based on autistic user characteristics and usability attributes. The design principles identified are then tested on end-users, in this case, autistic users, to determine whether they are effective or not. This is done by way of mockups; different mockups for English alphabet teaching android application are developed to test various alternate presentation for each design principles. The mockups are then tested on end-users and test results are documented. The test results show that the design principles identified in this research paper are worthy to be considered in designing English alphabet teaching android application to autistic users, but the principles can also be applied in developing other android applications too.
  • No Thumbnail Available
    Item
    Developing Design Principles for Autistic Android Application Users : the Case of English Alphabet
    (Addis Ababa University, 7/5/2021) Bekele, Abreham; Lemma, Dagmawi
    Autism Spectrum Disorders (ASD) are enduring neurodevelopmental and behavioral disorders found in early childhood. Children diagnosed with the disorder show communication, emotional, and social impairment varying from mild to severe. Over the last decade, an immense amount of research in computer science has been done on developing different computer-assisted solutions in improving the condition of children diagnosed with autism. The solutions comprise of computer, multi-touch table, smartphone-based application to improve or develop communication (verbal skills), emotional (non-verbal skills), and social interaction skills in these children. However, most of the android applications developed for autistic users are difficult to use, this is mainly due to the lack of standard usability guidelines and principles for developing android applications for autistic users. This research paper identifies design principles to tackle this issue of usability regarding android applications developed for autistic users with an emphasis on English alphabet teaching android application. First characteristics of autistic users that affect the usability of android applications are identified, then usability attributes that are related to autistic users’ characteristics are identified, and then, finally, design principles from previous literatures are revisited and the new ones are developed based on autistic user characteristics and usability attributes. The design principles identified are then tested on end-users, in this case, autistic users, to determine whether they are effective or not. This is done by way of mockups; different mockups for English alphabet teaching android application are developed to test various alternate presentation for each design principles. The mockups are then tested on end-users and test results are documented. The test results show that the design principles identified in this research paper are worthy to be considered in designing English alphabet teaching android application to autistic users, but the principles can also be applied in developing other android applications too.
  • No Thumbnail Available
    Item
    Genetic Diversity Study of Anchote (Coccinia Abyssinica (Lam.) Cogn.) Using Inter Simple Sequence Repeat (Issr) Markers
    (Addis Ababa University, 2012-12-12) Bekele, Abreham; Feyissa, Tileye (PhD)
    Anchote (Coccinia abyssinica) is perennial trailing vine, underutilized but very important endemic plant with high calcium content grown for its edible tuberous roots in Ethiopia. In spite of its importance as food security crop, there is no information on molecular genetic diversity of this crop. Therefore, the objective of this study was to assess genetic diversity within and among 12 populations of anchote using ISSR markers. A total of 87 scorable bands were generated using nine ISSR primers among which 74 were polymorphic. Within population diversity based on polymorphic bands ranged from 13.8% to 43.53% with mean of 33.05%, Nei’s genetic diversity of 0.04 to 0.156 with mean of 0.118, Shannon information index of 0.07 to 0.23 with mean of 0.175 and AMOVA within population 51.4%. With all diversity parameters, the highest diversity was obtained from Gimbi, Bedele and Ale, whilst the lowest was from Manna. AMOVA showed 48.56% among populations variability and significantly lower than that of within population variation. Population differentiation with FST was 48.6%, impling high differentiation among population. From Jaccard’s pairwise similarity coefficient, Decha and Nedjo were most related populations exhibiting 0.76 similarity and Manna and Nedjo were the most distantly related populations with similarity of 0.52. The penta nucleotide primer 880 (GGAGA)3 showed unique band in some individuals that appeared to be associated with morphological traits. Illubabor and Gimbi populations exhibited highest genetic diversity so that the populations should be considered as the primary sites in designing conservation strategy and improvement of this crop.