http://dspace.ewubd.edu:8080/xmlui/handle/123456789/2035 2026-04-06T12:20:40Z 2026-04-06T12:20:40Z Sayeed, Md. Sohab Chowdhury, Abdullah Al Maymun http://dspace.ewubd.edu:8080/xmlui/handle/123456789/2597 2019-03-13T07:44:25Z 0001-01-01T00:00:00Z

An Overview of DESCO’s Distribution, Operation, Maintenance and Customer Care Sayeed, Md. Sohab; Chowdhury, Abdullah Al Maymun Electricity is the ultimate tool for modernization. It created it, sustains and will hence propel its borders past present limitations. Proper supply of electricity has a positive impact on GDP of a country. In Bangladesh, there is always a deficit of electricity production. At the moment, only 60% of our entire popUlations are getting electricity. People, who are getting electric lines, are also facing a great deal of load shedding. After the liberation war, every government tried to improve power sectors but the struggle with meeting the demands of the electrical consumption still persists. The most pressing problem in the power sector has been with the distribution system, which is characterized by heavy system loss and poor collection perfonnance. Dhaka Electric Supply Company Ltd. (DESCO) was created in 1996 under company Act 1994 as a public Limited company to improve better revenue collection and better consumer service. This thesis submitted in partial fulfillment of the requirements for the degree of B.Sc in Electrical and Electronic Engineering of East West University, Dhaka, Bangladesh.

0001-01-01T00:00:00Z Shah, Md. Imran http://dspace.ewubd.edu:8080/xmlui/handle/123456789/2596 2019-03-13T07:44:25Z 0001-01-01T00:00:00Z

Drive Test, Survey, Single Site Verification and Optimization in Wimax Technology. Shah, Md. Imran Wi max (Worldwide Interoperability for Microwave Access) technology is the topic of my internee work. Drive test, survey, single site verification and optimization is the main subject of my internee work. I was under a senior RF engineer and had the full scope and independence to work on the project. While working on the project I had the scope to come cross many new things of the Wimax technology. This internship report provides the detail about the mobile Wimax system and its overall working procedure to maintain the drive test, survey, single site verification and optimization and also designing in a proper network planning which is helpful to offer better throughput broadband wireless connectivity at a much lower cost. During my internee period I have spent a superior time in learning and performing. I had the experience of corporate reporting working environment which affects an employee performance and approach to work. I also had the opportunity to work in practical field, which will be very helpful in my professional life. This thesis submitted in partial fulfillment of the requirements for the degree of B.Sc in Electrical and Electronic Engineering of East West University, Dhaka, Bangladesh.

0001-01-01T00:00:00Z M. A. Al-Mamun Shahriar, Shaimum Chowdhury, Mamun http://dspace.ewubd.edu:8080/xmlui/handle/123456789/2595 2019-03-13T07:44:25Z 0001-01-01T00:00:00Z

Performance Comparison between INAS on Insulator and Silicon on Insulator Mosfets Using a Compact Model M. A. Al-Mamun; Shahriar, Shaimum; Chowdhury, Mamun Silicon-on-insulator (SOl) MOSFET is one of the modem state of the art transistor in Qruch a semiconductor layer like silicon is formed above an insulator layer on a semiconductor substrate. In SOl MOSFET, there is much more advantages over bulk silicon MOSFET such as high speed operation, low power consumption, small short channel effects. Over the past several years, the inherent scaling limitations of silicon (Si) electron devices have fuelled the exploration of alternative semiconductors, with high carrier mobility, to further enhance device performance. In particular, compound semiconductors heterogeneously integrated on Si substrates have been actively studied: such devices combine the high mobility of lII-V semiconductors and the well established, low-cost processing of Si technology. This integration, however, presents significant challenges. Conventionally, heteroepitaxial growth of complex multilayers on Si has been explored but besides complexity, high defect densities and junction leakage currents present limitations in this approach. Motivated by this challenge, we use a three surface potentials (gate oxide-silicon film interface, silicon-film-buried oxide interface and buried oxide-substrate interface) based compact model to study a fully depleted SOl and XOI MOSFETs. We have simulated the surface potentials, surface charge density, gate capacitance, drain current, transconductance and unity gain frequency of SOl and XOI MOSFETs. The different output characteristics show a better performance for InAs. We have got high drain current transconductance and unity gain frequency of XOI MOSFET. On the other hand, we got very low (negative) threshold voltage for XOI MOSFET. So, by using XOI MOSFET, we can get high speed operation and amplification, low power consumption than SOl MOSFET as well as bulk silicon MOSFET. This thesis submitted in partial fulfillment of the requirements for the degree of B.Sc in Electrical and Electronic Engineering of East West University, Dhaka, Bangladesh.

0001-01-01T00:00:00Z Ahmed, Sabbir Khan, Md. Shlahuddin http://dspace.ewubd.edu:8080/xmlui/handle/123456789/2594 2019-03-13T07:44:25Z 0001-01-01T00:00:00Z

Design and Implementation of a Line Following Robot with Temperature Sensing and Comparing Capability Ahmed, Sabbir; Khan, Md. Shlahuddin Line following robot is a kind of robot which can detect a path drawn in a surface. This can be a black line in white surface or white line in a black surface. In this project we made a line following robot which can follow a white line drawn on a black surface. The robot has another feature - the ability to sense the temperature. So, the objective to make this robot is to follow a white line in black surface and also sense the temperature in its path. The robot is programmed so that it can measure temperature in its path at an interval of 30 seconds. The application of this robot is in temperature sensitive areas like cold storage, chemical industries, medicine manufacturing farms etc. In these areas, maintenance of temperature is an important issue, so we can easily use this robot. The principle of detecting the path uses the reflectivity of light. Black surface absorbs light and white surface reflects it. We have used seven LEDs (Light Emitting Diode) and seven LDRs (Light Depending Resistor) to detect the path. An LED and an LDR together make a single sensor circuit. When the sensor is over a white surface, the light from the LED reflects from the surface to the LDR and due to the decrease of resistivity of the LDR, the voltage across the LDR decreases. The output of each sensor circuit works as an input of a comparator (Ie LM324) which compares the output voltage ofLDR to a reference voltage which is given manually. If the LDR output voltage is higher than the reference voltage, then the comparator outputs logic high; otherwise the comparator output is logic low. So the comparator Ie converts the analog signal to digital. As we have used seven sensors to detect path, so we have a combination of seven bits of logical data. Value of this combination always changes during the path following. We use those combinations to the input pins of the microcontroller as the digital data. In our project we have used microcontroller ATmega16A from AVR. The microcontroller gives output (according to the data and the program code) to a motor drive IC. This thesis submitted in partial fulfillment of the requirements for the degree of B.Sc in Electrical and Electronic Engineering of East West University, Dhaka, Bangladesh.

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