Mekelle Institute of Technology

www.mitethiopia.edu.et
Tigray, Ethiopia

Mekelle Institute of Technology is located at Ainalem, five kilometers outside of Mek'ele, the capital of the northwestern Tigray Region of Ethiopia. Wikipedia.

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Nydal O.J.,Norwegian University of Science and Technology | Tesfay A.,Mekelle Institute of Technology
ISES Solar World Congress 2015, Conference Proceedings | Year: 2015

SK14 is a well known solar dish reflector which is made for cooking in a pot positioned at the focal point. The reflector consists of aluminium sector sheets which are attached to a light frame designed for manual solar tracking. The SK14 is here evaluated as a reflector for frying of the Ethiopian injera bread. Ray tracing shows that the reflected rays spread more evenly on the pan, but also gives higher losses compared with an ideally smooth reflector. A test on heating a frying pan which was custom made for the SK14 showed that frying temperatures for injera baking can be reached with the SK14 reflector. High thermal losses and illumination of the pan at an angle results in quite long heating time for the pan. © 2016. The Authors.


Sahoo C.K.,Osmania University | Rao S.R.M.,Mekelle Institute of Technology
Der Pharmacia Lettre | Year: 2015

The aim of this review outlines the application of mathematical models for study of release phenomenon of drug from dosage forms. Mathematically it is easy to identify the designing of a dosage form and it can be used to predict the effect of device design parameters on the release kinetics of the formulation. It is easier to obtain the quantitative analysis of data for dissolution release rate by using these models. The choice of selection of best model depends on the desired ability and accuracy of the model. The mathematical modeling can finally to optimize the design of a therapeutic system with programmed release rate characteristics which is now prerequisite for drug delivery system. This review gives the idea about the various mathematical modeling and their applications in drug delivery systems.


Neri A.R.,Mekelle Institute of Technology
Italian Journal of Planning Practice | Year: 2014

China, in its construction fever, has imported from Europe a great range of architectural and design features. The planning systems of China and of most European countries are based on functional zoning, allowing meaningful comparison. Nonetheless, the process and goals of spatial planning differ markedly and China largely ignores the distinctive progress achieved in the field in Europe. Across Europe, the model of planning is undergoing important transformations in the last decades, gradually making decisions concerning landuse more participated, flexible and sustainable, and safeguarding the rural dimension. In contrast, the planning system of China is primarily focused on promoting urban GDP growth and is still based on a topdown approach. The inclusion of some key elements of European planning into the Chinese system, with particular reference to laws establishing national standards and comprehensive environmental protection, would benefit China by reducing the internal inequalities between cities and countryside and safeguarding its natural assets.


Abrha H.,Mekelle Institute of Technology
Proceedings of the International Conference on Industrial Engineering and Operations Management | Year: 2017

Metal active Gas (MAG) welding is one of the widely used techniques for joining ferrous and non-ferrous metals. In this experiment Design of Experiment method was used. Investigation of MAG welding parameter optimization for good penetration and surface quality is very important to improve the technology of MAG welding application. The aims of this thesis was examine effects of eight MAG welding parameters on Mild Steel specimens which have dimension 150 mm x 100 mm x thickens, by metal active gas. These welding parameters are amperage, arc voltage, welding speed, stick-out length, welding angle, shielding gas, material thickens were selected for the DOE based on the selection criteria for investigated depth of joint penetrations and welding porosity on butt joint.By used the optimization tool the thesis deals with the input parameters of MAG welding and examines the interaction between welding parameters and its response. As the DOE indicated MAG welding parameters are the most important factors to control welding quality, productivity and failure cost. The Experiments was conducted based on taguchi and root cause analysis diagram. Root cause identification for quality and productivity related problems are key issues for manufacturing processes. The experimental work was conducted to optimize the input process parameters to get optimum welding quality. By used DOE each welding parameter their influence for porosity and joint penetration were investigated. Analysis and optimization of MAG welding parameters were conducted based on ANOVA and GA respectively.Based on the optimized parameters welding porosity decrease by 3.92%, 3.34 %, 3% in flat, horizontal and vertical welding position respectively with maximum penetration of 4.61, 3.71, 3.21 mm, respectively of the welding position at the shielding gas of 12 L/min were found as the result of DOE indicated amount of shielding gas not affected by the welding position that's way shielding gas of 12 L/min were led for the three welding positions. © IEOM Society International.


Achamyeleh T.,Debre Tabor University | Bayray M.,Mekelle Institute of Technology
Proceedings of the International Conference on Industrial Engineering and Operations Management | Year: 2016

The aim of this paper is to foster wind turbine blade design optimization using Genetic Algorithm considering NACA64A410 as a case. The design optimization of turbine blades using GA with regards to different objective functions are described and found supportive one another. NACA64A410 aerofoil shape is modeled as baseline aerofoil using fifth order Bezier curve functions with acceptable error to find control points that to shape of the aerofoil. Design of Experiment is planned for eight design variables with three levels each. 27 analyses are conducted with a varying control point values using ANSYS Fluent 14.0 workbench. Lift and drag coefficients are recorded as an output for each analyses. The objective function is formulated as a minimization problem of drag-to-lift coefficient ratio subjected to bounded constraints using 8 control points' y-coordinate values. Using MINITAB-, control point values, as an input and drag- to-lift coefficient ratio, as response, are modeled with full quadratic surface response model function which is later optimized in MATLAB GA Toolbox. The optimization showed that drag-to-lift coefficient ratio is minimized taking control points as parameters of the minimization objective function. About 16.5% drag-to-lift reduction is achieved by implementing the aerodynamic shape optimization methodology that has been used in this research. Finally, it's recommended that one can model aerofoil using Bezier curve modeling technique and integrate it with GA for finding optimal value of objective function of any sort. © IEOM Society International. © IEOM Society International.


Abdela A.,Mekelle Institute of Technology
Proceedings of the International Conference on Industrial Engineering and Operations Management | Year: 2016

Due to its global superiority in addressing cost, quality, flexibility, and quick response to customer, Lean manufacturing principles have become a widely acceptable and adoptable manufacturing practice. This research, therefore, deals with assessing the leanness level for adapting lean principles that are found to be successful for automotive sectors to textile processing in Ethiopian. The main purpose incorporated in it comprises measuring the existing leanness level of the textile industry to augment its brilliance level. Progressive purposive sampling is utilized throughout the research and then the concept of customized rapid plant assessment (RPA) is explained. And, the appraisal is started by assessing the 'as is' of the textile wing though reviewing the existing relative leanness that are unanimously used to assess the level of leanness. This finding resulted in six dominant leanness related shortcomings; including team work and motivation, visual management system, supply chain integration, safety and cleanness, in the textile processing and in turn characterized the related leanness of the section. The correlations between these shortcomings are analyzed to smooth the progress of the adaptation. Based on the finding from the aforementioned analyses, benchmarks of other global companies were recommended with their respective priority at the end. © IEOM Society International. © IEOM Society International.


Hailu D.H.,Mekelle Institute of Technology | Lema G.G.,Mekelle Institute of Technology | Bjornstad S.,Mekelle Institute of Technology
Indonesian Journal of Electrical Engineering and Computer Science | Year: 2017

Cloud Radio Access Network (C-RAN) has emerged as a promising solution to meet the ever-growing capacity demand and reduce the cost of mobile network components. In such network, the mobile operator’s Remote Radio Head (RRH) and Base Band Unit (BBU) are often separated and the connection between them has very tight timing and latency requirements. To employ packet-based network for C-RAN fronthaul, the carried fronthaul traffic are needed to achieve the requirements of fronthaul streams. For this reason, the aim of this paper is focused on investigating and evaluating the feasibility of Integrated Hybrid Optical Network (IHON) networks for mobile fronthaul. TransPacket AS (www.transpacket.com) develops a fusion switching that efficiently serves both Guaranteed Service Transport (GST) traffic with absolute priority and packet switched Statistical Multiplexing (SM) best effort traffic. We verified how the leftover capacity of fusion node can be used to carry the low priority packets and how the GST traffic can have deterministic characteristics on a single wavelength by delaying it with Fixed Delay Line (FDL). For example, for L1GE SM =0.3 the added SM traffic increases the 10GE wavelength utilization up to 89% without any losses and with SM PLR=1E-03 up to 92% utilization. The simulated results and numerical analysis confirm that the PDV and PLR of GST traffic in Ethernet network meet the requirements of mobile fronthaul using CPRI. For Ethernet network, the number of nodes in the network limits the maximum separation distance between BBU and RRH (link length); for increasing the number of nodes, the link length decreases. Consequently, Radio over Ethernet (RoE) traffic should receive the priority and Quality of Service (QoS) HP can provide. On the other hand, Low Priority (LP) classes are not sensitive to QoS metrics and should be used for transporting time insensitive applications and services. © 2017 Institute of Advanced Engineering and Science. All rights reserved.


Gebrekrstos G.,Mekelle Institute of Technology | Tesfamariam G.T.,Mekelle Institute of Technology | Ismail M.,Mekelle Institute of Technology
Indonesian Journal of Electrical Engineering and Computer Science | Year: 2017

For high performance communication systems, Side Lobe Level (SLL) reduction and improved directivity are the goal of antenna designers. In the recent years, many optimization techniques of antenna design are occupying demanding place over the analytical techniques. Though they have contributed attractive solutions, it is often obvious to select one that meets the particular design need at hand. In this paper, an optimization technique called Self-adaptive Differential Evolution (SaDE) that can be able to learn and behave intelligently along with hyper beam forming is integrated to determine an optimal set of excitation weights in the design of EcAA. Non-uniform excitation weights of the individual array elements of EcAA are performed to obtain reduced SLL, high directivity and flexible radiation pattern. To evaluate the improved performance of the proposed SaDE optimized hyper beam, comparison are done with uniformly excited, SaDE without hyper beam and Genetic Algorithm (GA). In general, the proposed work of pattern synthesis has resulted in much better reduction of SLL and FNBW than both the uniformly excited and thinned EcAA. The results of this study clearly reveal that the SLL highly reduced at a very directive beamwidth. © 2017 Institute of Advanced Engineering and Science. All rights reserved.


Lema G.G.,Mekelle Institute of Technology | Tesfamariam G.T.,Mekelle Institute of Technology | Mohammed M.I.,Mekelle Institute of Technology
IEEE Transactions on Antennas and Propagation | Year: 2016

With the advancement of radar technology, detecting objects, determining the structure of the target, and estimating the direction and the speed is prominently increasing. There is no doubt that small cross section targets are hardly identified and determined. This problem demands the need for antenna pattern synthesizing with a high gain and highly reduced sidelobe level (SLL). In this paper, an optimization technique called self-adaptive differential evolution (SaDE) that can be able to learn and behave intelligently is integrated to determine an optimal set of excitation weights in the design of elliptical-cylindrical antenna array (ECAA). In this work, the SaDE-optimized hyper beam is proposed to achieve qualified radar performances. Nonuniform excitation amplitudes of the individual array elements of ECAA are performed to obtain reduced SLL, high directivity, and flexible radiation pattern which are crucial in radar applications. With increased antenna gain, small cross section objects can be accurately identified and determined even in volatile environment where there are different natures of interferences. Besides, the proposed work enables steering electronically and it allows scanning very rapidly across a wide range of elevation and azimuth planes. To evaluate the improved performance of the proposed optimization scheme, comparison is done with genetic algorithm (GA), particle swarm optimization (PSO), biogeography-based optimization (BBO), and invasive weed optimization (IWO) against different parameters. In general, the proposed work of pattern synthesis has resulted in much better reduction in SLL and first null beamwidth (FNBW) than both the uniformly excited and thinned ECAA. The results of this study clearly revealed that the SLL is highly reduced at a very directive beamwidth. The proposed antenna array offers high system availability over wide range of radar applications. © 1963-2012 IEEE.


Sbhatu D.B.,Mekelle Institute of Technology
Journal of Commercial Biotechnology | Year: 2010

This article was written to provide compelling rationales for initiating biotechnology education, and a research and development programme in one technology institute in Ethiopia. As the author wishes to share these with a wider audience, the article is presented in the following way: it begins with a brief history of the traditional and conventional biotechnologies in Ethiopia; and reviews the national status of modern biotechnology. The potential of modern biotechnology to promote national development through its support of endeavours in agriculture, environmental management and rehabilitation, health care and industry/manufacturing is then discussed. Finally, the article lists and discusses the key topics that have to be taken into account while introducing and developing modern biotechnology in Ethiopia. Until a good national policy is produced, the topics could serve as guidelines for institutions engaged in biotechnology and life science research. © 2010 Palgrave Macmillan 1462-8732.

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