http://hdl.handle.net/10361/691 2013-05-24T15:07:30Z 2013-05-24T15:07:30Z Muhtadi, Taseen Amin, Nurul Tabassum, Musrat http://hdl.handle.net/10361/2318 2013-04-30T16:23:15Z 2012-12-15T00:00:00Z

Museum security system Muhtadi, Taseen; Amin, Nurul; Tabassum, Musrat A comprehensive security system incorporating motion sensors and laser sensors activated and deactivated by a password. The security system is designed to protect a valuable object. Access to the room can only be gained by entering the correct password. Upon unauthorized entry into the room or coming into close proximity of the object or removal of the object in question from its place would sound the alarm. This thesis is submitted in a partial fulfillment of the requirement for the degree of Bachelor of Science in Electrical and Communication Engineering.

2012-12-15T00:00:00Z Chowdhury, Ahasanul Haque http://hdl.handle.net/10361/1914 2013-03-21T04:16:04Z 2012-05-01T00:00:00Z

Design and animation of automated alternative solar water heater system at the BRAC University roof top by using solid works and implement the controller using GAL technology Chowdhury, Ahasanul Haque The objective of the thesis is to design the “alternative Solar Water Heater with Automated control system”, which is developed by CARG at the roof top UB building, using “SolidWorks 2012” software. Initially, I made a 2D model of the roof top project in SolidWorks. The sketch will consist of geometry and dimensions to define the size and location of the system. The dimensions in the sketch can be controlled independently. Finally, that drawing will be created of the designed model. Views are automatically generated from the SolidWorks model (3D) and notes, dimensions and tolerance can be easily added to the drawing as needed. This thesis is submitted to the Department of Electronics and Communication Engineering (ECE), BRAC University, in partial fulfillment of the requirements for the degree of Bachelor of Science in Electronics and Communication Engineering (BSc).

2012-05-01T00:00:00Z Salma, Umme Tanni, Tanzina Rahman Mourin, Nishat Jahan Islam, Humayra http://hdl.handle.net/10361/1473 2013-03-02T07:06:20Z 2011-05-01T00:00:00Z

Performance analysis of a Multi-tone direct sequence code division multiple access (MT-DS-CDMA) system over a nakagami-m fading channel Salma, Umme; Tanni, Tanzina Rahman; Mourin, Nishat Jahan; Islam, Humayra Performance analysis has been carried out for a multi-tone DS-CDMA wireless communication system over a faded channel considering the channel limitations. The analysis is based on MT-DS-CDMA system and a rake receiver with maximal ratio combining (MRC) diversity combining technique. The expressions for the output signal and (Multiple Access Interference) MAI has been derived for the above system model. The expression for the SNR and the unconditional BER at the output of the receiver has also been derived. The performance results has been evaluated numerically in terms of SNR, BER and the power penalty due to channel effect. The optimum system design parameters have been found for the numerical results. Also simulation works has been done for different parameters and comparison has been done with one of the most effective CDMA scheme among all the systems. This thesis is submitted in a partial fulfillment of the requirement for the degree of Bachelor of Science in Electronics and communication Engineering.

2011-05-01T00:00:00Z Purification, Paul http://hdl.handle.net/10361/886 2013-03-02T07:00:29Z 2010-12-08T00:00:00Z

Performance and analysis of DC-AC pure sine wave inverter Purification, Paul Energy crisis are of special attention in today's world. The unending usage of non-renewable energy sources will bring an end to the limited resources in near future. In order to preserve the resources, several alternative renewable sources have been in use these days. The power generated from the renewable sources, like solar energy, produces is a DC power which can be stored in batteries. This DC power needs to be converted to AC power as most of the appliances used in our daily life are dependent on AC power. To overcome this obstacle, DC-AC Inverter took birth.Inverter s can be categorized into three groups: Square wave, modified sine wave and pure sine wave. Considering power wattage, efficiency and harmonic content, pure sine wave inverters has proved to have the best quality among the three types. The control circuit for pure sine wave inverter produces sinusoidal pulse width modulation. There are two basic topologies to generate pulse width modulation¬Topology 1: Analog Control circuit and Topology 2: Microcontroller based control circuit.In this thesis project, performance of both topologies used in inverters has been analyzed and a DC-AC pure sine wave Inverter using the Analog control circuit (Topology 1) has been implemented. This thesis is submitted in a partial fulfillment of the requirements for the degree of Bachelor of Science in Electronics and Communication Engineering.

2010-12-08T00:00:00Z