Browsing by Author "Alemu, Frehiwot"
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Item Data-Based Access Control for Social Networks(Addis Ababa University, 2015-09) Alemu, Frehiwot; Lamesgin, Abraham (PhD)Social networking has become a popular way to be in contact with each other. In social networking, people tend to share a wide range of information with other users of the networking site. Here, security of personal information has become a most critical issue. One of the important issues in online social network is that how user privacy is protected because online social network providers have full control over users' data. The online social network providers typically store users' information permanently. Meanwhile, the trend in information security is mov- ing the security perimeter as close to the data as possible. We want to move the perimeter closer to the data, but do this without being able to derive who is accessing which data. An e cient privacy protection mechanism is important for online social networking sites that can be used to protect the privacy of online users' data from third parties. An access control mechanism shifts the control over data sharing back to the users by providing them with exible and dynamic access policies. Hence, instead of relying on credentials given by a person trying to access information, there is a need to protect the data using only the data itself. In this context where decryption of data is made possible by already knowing some part of the data. This thesis work discusses the implementation of data based access control in social networking sites. That is, personal information is made available only to those who already have some of this information. We de ned and analyzed types of data based access control methods (direct, indirect and order-invariant data based access control methods). An e ort is made to design suitable policy i in order to apply them to social networking sites. We implemented our solution in a prototype platform for social networking sites using a Java based prototype and My Structured Query Language (MySQL) database. Our experimental re- sults verify the e ectiveness of indirect data based access control method over social networking sites. This mechanism provides enhanced security features from both eavesdrop attacks and provider attacks. Moreover, we present a performance study of the implemented prototype. Key words: Data Based Accessed Control, Social Network Security, Access Control Policies.Item Factors Affecting Consumer Brand Preferences: The Case of Cultural Food (Baltena) Producers(Addis Ababa University, 2021-09) Alemu, Frehiwot; Andualem, Getie (PhD)Every consumer has his/her own brand preference for products and apply it while making a purchase. The objective of this study was to examine the factors that affect customers brand preference for cultural food producers’ brand. The independent variables included in this study are advertisement, packaging, price, availability and quality; whereas brand preference is the dependent variable. The population of the study were all customers who purchases cultural food products from supermarkets and shops in Addis Ababa. The total sample size was 384. A total of 200 sample responses were collected from 384 sample size. The respondents were selected based on convenience sampling technique. The research design was explanatory and descriptive while the research approach used was Quantitative method. The effect of independent variables (advertisement, packaging, price, availability and quality) on customers brand preference were analysed using correlation and multiple regressions. The findings of the study showed that advertisement, price and availability have a siginfanct and positive impact on brand preference of cultural products while packaging and quality were found insignificant. The study recommends cultural product producers ((baltena) to focus on adverstiment, price and availability of their product in order to be preferred by consumersItem A Study on Lived Experience of Career and Personal Life Balance of Married Working Mothers; the Case of Ethiopian Commodity Exchange Authority Employees(Addis Ababa University, 2019-06) Alemu, Frehiwot; Tegegn, Hana (PhD)This study tries to understand Lived Experience of Career and Personal Life Balance of Married Working Mothers; the Case of ECEA Employees. The aim of the study is to examine how married working mothers balance their triple role of being wife, mother and employed worker. Qualitative study, using a semi-structured interview guide and FGD was employed in gathering the data. Eleven married working mothers where interviewed. Ten FGD members were discussed and thematic analysis was used to analyze the data. Finding from the study clarifies working mothers have their own definition of work life balance which differs from one another, they face challenges like, lack of consistent support, lack of consistent home maid, economic difficulty, work load, no nearby day care long transportation and gender role. Working mothers also face stress that comes from the guilt of leaving their children with house maid, from load of responsibilities and expectations, they have developed their own coping mechanism to help themselves cope up with their situation. It is also found that being married and having children don’t affect work promotion but some said that it has negative effect. These mothers perceive themselves as strong committed and selfless for their family. It is also found that married working mothers manage to attain work life balance with the help of others like family mother sister or house maid. Key words: work life balance, challenging gender role, support system, married working mothers.