http://hdl.handle.net/10361/690 2013-06-20T12:28:57Z 2013-06-20T12:28:57Z Khandaker, Shahidur http://hdl.handle.net/10361/2592 2013-06-13T09:50:45Z 2013-04-27T00:00:00Z

Developing a remote control for digital data transmission using infrared and rario frequency : wireless communication Khandaker, Shahidur In this work we will first realize a TV remote control system. The system will allow digital data to be transmitted over a significant distance using a radio link where the input will be infrared (IR) signal. As a result the user will be able to control electronic devices from a distance. The system will be tested using an IR remote control to move a remote control car. The system will comprise of transmitting and receiving antennas, microcontroller, IR generator, IR sensor. This system will enable IR signal to be used on a device from a distance without any line of sight of the output device. This thesis is submitted in a partial fulfillment of the requirement for the degree of Bachelor of Science in Electrical and Electronic Engineering, BRAC University

2013-04-27T00:00:00Z Dhar, Palash Khandakar, Ajijul Hakim http://hdl.handle.net/10361/2591 2013-06-13T09:50:47Z 2013-04-27T00:00:00Z

Green power / energy harvesting from wastage energy of human muscle activities Dhar, Palash; Khandakar, Ajijul Hakim As a developing country ours one is not like others, concerning electricity problems. The main issue with the point of view of electrical energy and its sources is lack of generation of electricity. It is happening because of our limitation of technology in the field of electricity. Though renewable energy is introduced, the impact of this new technology is not significant. This is why we are concern on electricity harvesting through human wastage energy. We will use pressure energy to harvest electricity by introducing a mechanism. This pressure energy is taken from the movement of human body. Actually we are trying to introduce such a mechanism through which the electricity problem of Bangladesh will be reduced significantly.The process of acquiring the energy surrounding a system and converting it into usable electrical energy is termed power harvesting. In the last few years, there has been a surge of research in the area of power harvesting. This increase in research has been brought on by the modern advances in wireless technology and low-power electronics such as micro-electromechanical systems. The advances have allowed numerous doors to open for power harvesting systems in practical real-world applications. The use of piezoelectric materials to capitalize on the ambient vibrations surrounding a system is one method that has seen a dramatic rise in use for power harvesting. Piezoelectric materials have a crystalline structure that provides them with the ability to transform mechanical strain energy into electrical charge and, vice versa, to convert an applied electrical potential into mechanical strain. This property provides these materials with the ability to absorb mechanical energy from their surroundings, usually ambient vibration, and transform it into electrical energy that can be used to power other devices. While piezoelectric materials are the major method of harvesting energy, other methods do exist; for example, one of the conventional methods is the use of electromagnetic devices. In this paper we discuss the research that has been performed in the area of power harvesting and the future goals that must be achieved for power harvesting systems to find their way into everyday use.On our project we will be trying to do this combination to harvest more energy. This thesis is submitted in a partial fulfillment of the requirement for the degree of Bachelor of Science in Electrical and Electronic Engineering, BRAC University

2013-04-27T00:00:00Z Reza, Sharzana Patwary, Shadman Sakib Ahmed, Rashik http://hdl.handle.net/10361/2590 2013-06-13T09:50:52Z 2013-04-01T00:00:00Z

Feasibility study highlighting the benefits of solar power over grid power for classroom loads Reza, Sharzana; Patwary, Shadman Sakib; Ahmed, Rashik Electricity is a very important factor in developing the economy and the standard of living of a country. Bangladesh largely depends on natural gas and hydro power stations to generate major portions of power. The country lacks behind than its expected production capacity. Though many power generation units have been added to the national grid to solve the power crises issue, it’s not yet enough. High demand and increasing need of power have created challenge for the power stations to meet the demand. From that concept of renewable energy such as solar energy, this thesis has aimed to launch a cost effective solar based system in one of the classrooms of the university, UB 20903. Here it’s mainly to run a fixed amount of loads, such as solar dc stand fans and LED lights, by using solar panel connected directly along with national grid using a controller device. This whole system was represented in the form of a prototype, where a 75 watts panel and a power supply representing grid power was used to connect to seven led lights and one dc fans through a controller. And based on this prototype,working and calculations was carried outfor the cost effectiveness and the feasibility of setting up of such project in reality. Use of software like HOMER was also shown for calculation validation. Taking initiative of such project two needs can be fulfilled. First of all is the reduction in the overall cost of huge current bill per year at a satisfactory level which would be a bright finding for BRAC University. Secondly, according to Bangladesh perspective it would be green process that may bring a very highlighting positive result in economic and environmental prospect. This thesis is submitted in a partial fulfillment of the requirement for the degree of Bachelor of Science in Electrical and Electronic Engineering, BRAC University

2013-04-01T00:00:00Z Dewan, Priyanka Das Shamma, Tasnim Harun Abbas, Afifa Mondol, Raktim Kumar http://hdl.handle.net/10361/2503 2013-06-13T09:50:33Z 2013-04-01T00:00:00Z

Design and VLSI implementation of high performance face recognition system Dewan, Priyanka Das; Shamma, Tasnim Harun; Abbas, Afifa; Mondol, Raktim Kumar In this paper, we have proposed a novel hardware architecture for face-recognition system. In order to make the system cost effective we have used a simple yet efficient algorithm of face-recognition system. We have designed, implemented and verified the algorithm in a cyclone III Field Programmable Gate Array (FPGA) chip. Altera DE0 development board which contains a cyclone III chip on it have been used for debugging purpose. We have also ensured for low power consumption such that the chip could be used universally in a wide range of security systems. To develop a simple yet efficient face recognition algorithm (such as PCA, FFT etc.) on digital hardware, we have researched on various face recognition algorithms using Matlab codes and studied their detection efficiency under various posture and background and also the complexity of the algorithm. To save hardware resource and at the same time to obtain an acceptable level of recognition we have chosen to use Fast Fourier Transform. The search database is developed by taking pictures of BRAC University students in various background and postures and used them to evaluate the developed face recognition system. Images were captured using TRDB_D5M camera module and digital data from the camera was transferred to the SDRAM of the DE0 board using GPIO interface. A NIOS2 microprocessor was synthesized in the cyclone III chip which controlled the total recognition system and the communication between the FFT core, SDRAM and On-chip memory. The performance of the hardware is now under evaluation. This thesis is submitted in a partial fulfillment of the requirement for the degree of Bachelor of Science in Electrical and Electronic Engineering, BRAC University

2013-04-01T00:00:00Z