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Search Results: 1 - 10 of 127 matches for " Tilahun Seyoum Workenh "
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Simple and Low-Cost Exposed -Layer Grain Drying Apparatus
Tilahun Seyoum Workenh, Patrick M Grace
Journal of Food Technology in Africa , 2002,
Abstract: Thin-layer drying apparatus was developed from standard “off-the- shelf” equipment: a fan convection laboratory oven and a weighing scale. Using this apparatus the thin-layer drying data for wheat under constant conditions were obtained for a range of drying air temperature from 30°C to 150°C and the initial moisture content from 0.20 to 0.42 (d.b.). The smooth drying characteristic curves were obtained and used to develop coefficients for three thin layer models namely: Grace (modified Henderson) model, Chen and Johnson, and the numerical diffusion models. The Grace and the Chen and Johnson models were the best at describing the drying curves giving a standard error of the moisture ratio less than 0.027. The drying apparatus enables monitoring of the sample weight during drying without opening the oven. The drying air properties (relative humidity and temperature) inside the oven were kept constant throughout drying. The next special feature of it was that the sample kept on drying even at the time of recording its weight. No temperature change was observed after the oven was switched on after 30 seconds. This apparatus is relatively simple and can be used for drying of biological materials. However, several thin-layer grain drying researchers have obtained moisture loss by using fast sampling devices through out the drying period. During the study a fast sampling device was not used because it was necessary to turn off the oven before taking measurements.
Effect of Modified Atmosphere Packaging on Microbiological, Physiological and Chemical Qualities of Stored Carrot.
Tilahun Seyoum Workneh, G. Osthoff, M.S. Steyn
Journal of Food Technology in Africa , 2001,
Abstract: Optimum packaging film for carrots should lead to low condensation, but preventing moisture loss, and maintain optimum gas composition during the storage period. In this study, carrots were packaged in polypropylene (PP) and low density polyethylene (LDPE) films and stored at 0 C and ambient temperature (15-25 C). After 7 days of 0 C storage headspace O2, CO2 and N2 concentrations were 11.85%, 13.38%, and 6.69% for PP films and 3.39%, 3.24% and 4.77% for LDPE films. On the other hand, after 7 days of ambient temperature storage O2, CO2 and N2 concentrations were 6.78%, 28.31%, and 16.15% for PP films and 6.41%, 5.19% and 5.28% for LDPE films. The higher the CO2 content of the headspace the more the sucrose content decreased while the glucose and fructose content changed slower. A general decrease of the sugars (sucrose, glucose and fructose) was observed for all samples packaged in PP. The free sugars in carrots were observed to decrease at a slower rate for packaging in LDPE. Based on these results, it was concluded that LDPE film allowed lower respiration rates and is preferred to the PP material. The number of total aerobic microorganisms was higher in packages stored under ambient conditions than in those stored at 0oC temperature. The lowest counts were observed in the least permeable packaging film (PP) up to day 14. The total number of populations of coliform was higher with PP and LDPE films stored under ambient conditions as compared to those stored at OoC. Packaging films with relatively higher permeability to O2 and CO2 are preferred for maintaining normal respiration of carrots without the occurrence of secondary decomposition during storage. Modified atmosphere packaging combined with low temperature storage of carrots (about 1 C) reduces both biological and biochemical activities resulting in improved keeping quality. The Journal of Food Technology in Africa Volume 6 No.4, 2001, pp. 138-143 KEY WORDS: Modified atmosphere packaging, polypropylene, low density polyethylene
Staff Development as an Imperative Avenue in Ensuring Quality: The Experience of Adama University
Yilfashewa Seyoum
Education Research International , 2012, DOI: 10.1155/2012/624241
Abstract: All endeavors were devoted to investigate the views and feelings of stakeholders on the implementation of teachers’ professional development and its contribution to sustain academic programs quality at Adama University. A case study that constitutes qualitative and quantitative method was employed. In an attempt to achieve the objectives of the study, evidences were collected from students, staff members, professional development program coordinators, and management bodies. The data-collecting instruments for obtaining relevant information were questionnaires, interview, observation, and document analysis. The finding in relation to this study uncovers the fact that though continuous professional development has been perceived as the most useful avenue of teachers continuous and lifelong learning, for the most part, it is relegated to adhoc committees or interested group or institutional units in the system of university education/training. Moreover, the absence of PDP in the university organizational structure, clear mission and vision, defined and well-articulated policy, strategic plan, representatives in university senate meetings, adequate resources, well-identified and -preserved training facilities, and unit library were circumstances that in one way or another negatively affected the provision of effective professional development programs/trainings that may have adverse effect in the deliberation of quality education/training in Adama University.
REVITALIZING QUALITY USING GUIDANCE COUNSELING IN ETHIOPIAN HIGHER EDUCATION INSTITUTIONS: EXPLORING STUDENTS’ VIEWS AND ATTITUDES AT HARAMAYA UNIVERSITY
Yilfashewa Seyoum
International Journal of Instruction , 2011,
Abstract: This study attempts to scrutinize how guidance counseling is implemented and its impact in enhancing quality in higher education institutions. The sole purpose of the investigation is to explore students’ views and attitudes and how the current practices of guidance counseling contribute to foster excellence of the various university academic training programs. To this effect, it is believed that the finding related to this study could serve to identify challenges and opportunities, develop an appropriate strategy for future guidance counseling effort in the Ethiopian Universities in general and Haramaya University in particular. The tool designed to serve the purpose is questionnaire, and personal as well as colleague observation of the day-to-day interactions. The findings of this study uncover the fact that students do not have sufficient knowledge on the kind and the extent of guidance counseling services offered in the university campuses. However, about 80 percent of the respondents claimed that they have favorable attitudes toward the guidance counseling services in general. In the study, examination on the differences with respect to certain variables (such as programs, sex, and locality) in perceptions and attitudes toward the guidance counseling services are vigilantly scrutinized. At the end, pertinent suggestions that would assist Ethiopian universities in the sector of guidance counseling are included.
STAKEHOLDERS PERCEPTIONS AND CONCERNS ON OPEN AND DISTANCE EDUCATION IN THE HIGHER INSTITUTIONS: The Case of Eastern Ethiopia
Yilfashewa SEYOUM
The Turkish Online Journal of Distance Education , 2008,
Abstract: This study attempt to examine the perception of stakeholders (Tutors & coordinators) in open and distance education with particular reference to the eastern region of Harargie.30 tutors and 10 program coordinators were consulted and considered as subjects of the study. Both quantitative and qualitative approaches were employed in the data treatment and analysis. Data were collected from the selected sample employing a questionnaire and an interview( which include open ended items) The results indicate that the nature of the tutorial services provided by tutors does not follow the fundamental principles of distance education. The tutorial programs were devoted largely to teachers’ verbal explanation of descriptive facts which is the typical feature of conventional face-to-face instruction. The late arrival of course modules to the students; the distribution of modules very close to the actual dates of the tutorial sessions; tutors’ reliance on the conventional face-to-face mode of instruction; large class size and the heavy workloads imposed upon tutors in some tutorial centers were some of the major constraints that caused the program to be implemented in an unsatisfactory way.
Invigorating Quality through Professional Development Programs in Ethiopian Higher Education Institutions: Implications for Curriculum Enactment at Haramaya University
Yilfashewa Seyoum
International Journal of Social Sciences and Education , 2011,
Abstract: The purpose of this study was to assess the views of staff members and staff training initiators on how the current staff trainings were conducted and contributed to quality training/ education at Haramaya University. In the process of this study, evidences were collected from academic staff members, center coordinators and professional development training facilitators. Data collecting instruments were questionnaires, interviews, and document studies including the day-to-day observation of colleagues and personal experiences. The findings of the given study assure that academic staff members have positive perceptions and have favorable attitudes toward professional development training offered by staff development centers. However, professional development coordinators and staff members felt that more effort has to be exerted to strengthen the staff training center in the future. Members of staff development centers and coordinators believe that the development of apposite professional development schemes that would assist the staff training program need to be carefully designed in coordination with concerned bodies.
Staff Development as an Imperative Avenue in Ensuring Quality: The Experience of Adama University
Yilfashewa Seyoum
Education Research International , 2012, DOI: 10.1155/2012/624241
Abstract: All endeavors were devoted to investigate the views and feelings of stakeholders on the implementation of teachers’ professional development and its contribution to sustain academic programs quality at Adama University. A case study that constitutes qualitative and quantitative method was employed. In an attempt to achieve the objectives of the study, evidences were collected from students, staff members, professional development program coordinators, and management bodies. The data-collecting instruments for obtaining relevant information were questionnaires, interview, observation, and document analysis. The finding in relation to this study uncovers the fact that though continuous professional development has been perceived as the most useful avenue of teachers continuous and lifelong learning, for the most part, it is relegated to adhoc committees or interested group or institutional units in the system of university education/training. Moreover, the absence of PDP in the university organizational structure, clear mission and vision, defined and well-articulated policy, strategic plan, representatives in university senate meetings, adequate resources, well-identified and -preserved training facilities, and unit library were circumstances that in one way or another negatively affected the provision of effective professional development programs/trainings that may have adverse effect in the deliberation of quality education/training in Adama University. 1. Introduction The continuous revision of curricula and development of new and unusual academic programs demands a system to train and retrain instructors and academic leaders on continuous bases. To this end, staff and professional development programs become a foreseeable strategy that higher education institutions should build in their system in order to survive in the current changing demands and accountability. Thus, since professional development is a vital element to the survival and growth of higher education systems, institutions must carefully plan and implement professional development programs to muddle through these different pressures. And, in order to be successful, the professional development programs need to be taken into account both for the benefits of the staff and the institution [1, 2]. In order to resolve many of the academic pressures and make timely response for those policy matters, the Ministry of Education has integrated academic and professional development programs in Ethiopian higher education reform. To this end, in relation to the improvement of institutions and
Enhancing Amharic Information Retrieval System Based on Statistical Co-Occurrence Technique  [PDF]
Abey Bruck, Tulu Tilahun
Journal of Computer and Communications (JCC) , 2015, DOI: 10.4236/jcc.2015.312006
Abstract: Information retrieval (IR) systems are designed to help information seekers retrieving relevant information from vast document. The need for relevant information from a vast amount of document gave birth to IR systems. Even though different IR systems exist, they cannot meet all users’ expectations. A different level of users’ knowledge makes queries to be expressed in different ways. As a result, the system may miss the core meaning of users query and retrieve dissatisfactory results. This happens mainly because of the ambiguities of words involved in the natural languages and expression mismatch among users and authors. The existing ambiguities in Amharic language have negative impacts on the performance of Amharic IR system. Some of the ambiguities for this type of problem are: spelling variants of the same word, polysemous and synonymous terms. If users are not fully knowledgeable about the information domain area, they will mostly formulate weak queries to retrieve documents. Thus, they end up frustrated with the results found from an IR system. This research has been conducted, aiming at augmenting the recall of previous work. Statistical co-occurrence technique has been used in order to expand query terms. The main reason for performing query expansion is to provide relevant documents as per users’ query that can satisfy their information need. Statistical co-occurrence method considers, frequently appearing terms with the query term, regardless of their position. The efficiency of proposed technique has been tested on the prototype system and the result found compared with the result of previous study. Accordingly, 6% recall and 2% f-measure improvement has been made. Hence, the statistical co-occurrence method outperformed the bi-gram based IR system.
Modeling and Simulation of Real Gas Flow in a Pipeline  [PDF]
Agegnehu Atena, Tilahun Muche
Journal of Applied Mathematics and Physics (JAMP) , 2016, DOI: 10.4236/jamp.2016.48175
Abstract: In this paper, a mathematical model that describes the flow of gas in a pipe is formulated. The model is simplified by making some assumptions. It is considered that the natural gas flowing in a long horizontal pipe, no heat source occurs inside the volume, transfer of heat due to heat conduction is dominated by heat exchange with the surrounding. The flow equations are coupled with equation of state. Different types of equations of state, ranging from the simple Ideal gas law to the more complex equation of state Benedict Webb Rubin Starling (BWRS), are considered. The flow equations are solved numerically using the Godunov scheme with Roe solver. Some numerical results are also presented.
Design and Development of E-Governance Model for Service Quality Enhancement  [PDF]
Tulu Tilahun, Durga Prasad Sharma
Journal of Data Analysis and Information Processing (JDAIP) , 2015, DOI: 10.4236/jdaip.2015.33007
Abstract: Governance is a process of establishing policies or laws and continuously monitoring their implementation in the public. Citizens are the main stakeholders in this process. To make the governance process cost effective, easy and convenient to the citizens, information and communication technologies (ICTs) are playing a vital role. Using ICTs in governance domain can be referred as e-governance. It helps citizen to participate not only in policy making but also in service quality improvements and getting government services over network. Web technology is one of the major technologies that have been used in e-governance as a major contributor. Before invention of web, citizens used to write their opinions and send to concerned body via post mail or local suggestion box for improvements of services. After the invention of the web, it became possible to post or send the opinions/comments over organization’s web sites or portals. As the number of comments increases over the web, it is very difficult to have relevant information for furthering the decision making processes. In these study, text processing and data mining techniques have been used. The prototype system classifies citizen’s opinions in one of six service categories with the precision of 87.3% and recall of 85.8%. Further, the system determines opinions as appreciation with the precision of 100% for both depression and appreciation, and average recall of 90.85% for both depression and appreciation. The results obtained from the prototype system indicate that the techniques that have been applied are promising for real world application in e-governance.
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