Browsing by Author "Hasan, Sakibul"

Now showing 1 - 2 of 2

Design and Implementation of Automatic Student Attendance System Based on Fingerprint
(Daffodil International University, 23-01-29) Hasan, Sakibul; Alam, Md. Ashraful
It is important to record and maintain the right presence in today's world, because of attendance and success together. Many people have many problems due to lack of proper presence monitoring system. Attendance is one of the moralities of the owners' valuable work. Many educational institutions and government agencies in developing countries are still using paper based attendance methods to maintain existence records. These traditional tidal methods need to be replaced to change the presence of recording with the biometric existence system. The unique nature of the fingerprint is ideal for use in the management system. In this project we use a fingerprint sensor (R307) experiencing a particular person's fingerprint. Most people can protect their fingerprints. Next time when a person puts the finger on the sensor, it will check whether it is a fingerprint. If its fingerprint matches with a fingerprint stored, the LCD appearance shows that it is a person. In this model, all fingerprints are stored every time when someone plays the finger. This study is basically focused on the development of the biometric existence system, which can keep the existing record and count the data for daily purposes. In this project we are going to create a fingerprint sensor based biometric existence system using Arduino Nano. We only interface with fingerprint sensor, including Arduino Nano and LCD display for the desired project. In this project, we use fingerprint module and Arduino Nano to keep the existing data and records in excel sheet. Systems are commonly used to identify the presence in offices and schools. Using high tech apps and biometric systems from the existence of existence registers, these systems have been significantly developed. The project includes wide applications in the workplace that needs to be identified as schools, colleges, businesses and existence. Using fingerprint sensors, system becomes safer for users. The existence of biometric students increases the efficiency of the process of adopting the existence of students.
Introduction, Characterization and Efficiency Optimization of a Heterojunction Solar Cell with GaAs as Back Surface Field (BSF) Layer Using ADEPT/F
(Department of Electrical and Electronic Engineering, Islamic University of Technology (IUT), Board Bazar, Gazipur-1704, Bangladesh, 2015-11-15) Aziz, Ashiq Ibn; Hasan, Sakibul; Muntaha, Sidratul; Noman, Ahmed
Energy is convertible from one form to another. So, energy conversion efficiency is a major issue for photovoltaic cells today. Researchers are continuously trying to improve the efficiency level of photovoltaic devices by introducing new materials and advanced concepts. The target is to reach a high efficiency level within affordable cost, which will lead to a mass generation of electricity using photovoltaic devices. In this work, a III-V heterojunction solar cell has been introduced and characterized, which uses an AlGaAs heterojunction as the working p-n junction. ADEPT/F, a 1D simulation software, was used throughout the whole work for the simulation of light J-V characteristics for different designs. Energy conversion efficiency for each design was calculated from its corresponding light J-V characteristics curve. An illumination level of 1000 W/m2 (AM1.5G standard) and a concentration level of 1 sun was considered for all the simulations in the work. The photovoltaic cell has an n-on-p structure,where the p-type AlGaAs layer acts as a base, and the n-type ZnS layer serves as the emitter. The base thickness was kept at 1μm. Germanium (Ge) substrate (p-doped) was used for the structure. Considering the high fabrication cost of III-V solar cells, a thin film solar cell design was proposed,which is only 2 μm thick (excluding the substrate thickness), and yields an efficiency of 12.16%.This efficiency was raised to 13.84% by using InP substrate, instead of Ge. We used ADEPT software for simulating J-V curve. From the curves, we got Open circuit voltage Voc and short circuit current Isc . Then, from these, Fill Factor and efficiency were calculated.