Thesis 2014
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Item Spectrum Sensing of Cognitive Radio Network Under Linear Combination of Gaussian Random Variables(East West University, 9/21/2014) D’ Costa, John; Nazimuzzaman, MuhammadIn this project work we studied the Spectrum Sensing techniques for Cognitive Radio (CR) and derived Probability of Detection (PD) and Probability of False Alarm (PF) of a Cognitive Radio Network (CRN). Here we considered the test statistics as the weighted sum of the Gaussian random variables where the weighting factor depends on the eigenvalues of covariance matrix of Multiple-Input-Multiple-Output (MIMO) channel with Additive White Gaussian Noise (AWGN). We calculated PD and PF by changing channel parameters like number of sample values to find the threshold Signal-to-Noise Ratio (SNR) within condition PD above 80% and PF less than 8%.Item Design & Developing of a Microcontroller Based Smart Home Appliance Control System(East West University, 12/1/2014) Paul, Hiranmoy; Majumder, Ajit ChandraThe price of electricity is gradually increasing all over the world. In Bangladesh the price is also increasing day by day. In these circumstances, the users will try to minimize the wastage of electricity. In this project, a smart control system for home appliances has been developed to minimize the electricity wastage. The systems will automatically shutdown the electrical loads when the last person leaves the room. When the first person enters the room the loads will get power and can be run by their switches. If a person enters the room the system will increase its count by one and when a person leaves the room it will decrement its count. When the value of count is zero the power will be cut off. To count the number of persons in the room optical sensors have been used. An Arduino Uno board has been used to count the persons and control the power to the load. A program has been developed using Arduino software. The system has been constructed and tested. It is found that the system works properly.Item Research Project on Spectrum Sensing of Cognitive Radio Network under Linear Combination of Gaussian Random Variables(East West University, 12/1/2014) D’ Costa, JohnIn this project work we studied the Spectrum Sensing techniques for Cognitive Radio (CR) and derived Probability of Detection (PD) and Probability of False Alarm (PF) of a Cognitive Radio Network (CRN). Here we considered the test statistics as the weighted sum of the Gaussian random variables where the weighting factor depends on the eigenvalues of covariance matrix of Multiple-Input-Multiple-Output (MIMO) channel with Additive White Gaussian Noise (AWGN). We calculated PD and PF by changing channel parameters like number of sample values to find the threshold Signal-to-Noise Ratio (SNR) within condition PD above 80% and PF less than 8%.Item Automation of Neutron Activation Analysis(East West University, 9/7/2014) Barua, SumitraUtilization of power research reactor is often pursued due to increasing rate of the neutron activation analysis (NAA) activities. There are a lot of samples available obtained from different fields for measurement. Often requires a number of human interventions for data processing in NAA. Otherwise liquid nitrogen is wasted for proper utilization. Automation of NAA consists of some methods those can improve the efficiency and reliability of analysis. Automation of NAA requires a significant effort for the development and implementation of software, hardware and data management. The hardware requires a mechanical design for auto sample changer by pneumatic system. The job program for routine automation is provided by MAESTRO-32 software. When a counting is stopped, it executes an application program for serial interfacing with micro controller. The micro controller executes its instructions for sample changing by pneumatic system. The sample goes through the pneumatic system from rotary rack to the detector. Then the micro controller sends an acknowledgement to the windows application program and the job program is started for next counting.Item Design and Development of a Microcontroller-Based Cargo Lift Control System(East West University, 9/6/2014) Kabir, Md. Anwarul; Bakar, Md. Abul HasanA cargo lift is a type of vertical transport equipment that efficiently moves people or goods between floors (levels, decks) of a building, vessel or other structure. lifts are generally powered by electric motors that either drive traction cables or counterweight systems like a hoist, or pump hydraulic fluid to raise a cylindrical piston like a jack. In agriculture and manufacturing, a lift is any type of conveyor device used to lift materials in a continuous stream into bins or silos. Several types exist, such as the chain and bucket lift, grain auger screw conveyor using the principle of Archimedes' screw, or the chain and paddles/forks of hay lifts. lifts are a candidate for mass customization. There are economies to be made from mass production of the components, but each building comes with its own requirements like different number of floors, dimensions of the well and usage patterns. This document is intended to reflect a cost efficient policy regarding design and construction of cargo lifts. This document has been developed to assist architects and engineers in the proper design of lifts with low cost. This is because modern lifts are complex multi-disciplined products, guidance is needed to cost efficient lifts production and help the architectural and engineering disciplines understand their roles in lift design.Item Electrical and Optical Characterization of Thin Film(East West University, 8/12/2014) Rahman, AfshaniaIn this work, thin film of Al and Zno has been developed on microscopic glass substrate using EDWARD thermal vacuum evaporator. The thickness of the deposit films was measured using surface stylus profilometer Dektak-150. The deposition of the films was found in between 600 and 650 um. Over a total scan length 1000rm. The obtained thickness could be assessed precise for the present research and the uniform deposition within the obtained thickness may be attributed to strong adhesion between the materials of film and the microscopic glass substrate. Resistivity of the deposition thin films was measured by four point probe collinear technique using 4200 model semiconductor characterization system (SCS). The morphology of thin films was studied using scanning Electron Microscope. Absorption was assessed by UV-VIS spectrometer SEM.