Browsing by Author "Alemu, Getachew (PhD)"

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    Design and Simulation of a Wireless Based Transcutaneous Electrical Nerve Stimulator for Pain Control
    (Addis Ababa University, 2016-10) Paulos, Ashenafi; Alemu, Getachew (PhD)
    Pain is general term for unpleasant sensory and emotional experience associated with actual or potential tissue damage. For this reason, pain control and management is an important welfare concern even in routine management procedures of patients. The most widely used controls for pain at the present time are narcotic treatments. Recently, electrical nerve stimulation has emerged as a new mechanism for pain control that replace the narcotics which is a mechanism of injecting electrical impulse to the surface of the human body that suppressed the pain, but almost all developed systems are wired based and are not user friendly. Whereas, the narcotics most commonly prescribed have not only had a number of worrisome side effects, but also the cost is high and not affordable by most of the patients specifically in developing countries. In this thesis a wireless programmable microcontroller based transcutaneous electrical nerve stimulator has been designed and simulated, and the designed system gives a chance to the user to choose from the different types of stimulation parameters, like amplitude, frequency, pulse width, and duration, for how long the stimulation should be maintained. To achieve the specific advantages, the designed system uses eight levels of frequency, six levels of pulse-width, and four selectable stages which has been tested on ISIS PROTEUS DESIGN SUIT software, and for the programming parts of the design, mikro C PRO software for PIC language which is a popular high-level C programming language and Arduino Programming Language Software which is a simplified version of C/C++ has been accustomed. In summary, the proposed system gives different conditions of operations for the subject body to control the pain and overcome the drawbacks of the narcotics. It is flexible and user-friendly compared to the already built transcutaneous electrical nerve stimulation (TENS) systems that are available on related literatures and market. Keywords - Pain, Pain control and management, Wireless microcontroller based stimulation, Electrical nerve stimulation, and Transcutaneous electrical nerve stimulation (TENS) system.
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    Design of 3D Graphics Accelerator Core for FPGA
    (Addis Ababa University, 2011-10) Abebe, Kibret; Alemu, Getachew (PhD)
    In this thesis we designed and synthesized 3D graphics accelerator Intellectual Property (IP) using VHDL. The main parts which were designed in this work include: the geometry unit and the rasterizer unit of 3D graphics pipeline. The geometry unit design contains two main parts , the matrix transformation unit and clipping unit. The rasterzer unit based on bresenham line drawing algorithm. By doing this state-of-the-art design methodology divided in two sections, the first section is used to describe each block (i.e the matrix multiplier, matrix transformer , clipping and rasterizer) of the pipeline using VHDL and simulate each unit behaviorally. Second part synthesizes the system using Xilinx ISE 13.1 tool on XUP5VLX110T-1F1136. After doing the synthesis the designed 3D graphics accelerator performance was found to be 100M pixel fill rate with maximum clock frequency of 169 MHz.