Browsing by Author "Azad, A.K.M Abdul Malek"

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Agricultural analysis and crop yield prediction of Habiganj using multispectral bands of satellite imagery with machine learning
(BRAC University, 2020-09) Shahrin, Fariha; Zahin, Labiba; Rahman, Ramisa; Hossain, A S M Jahir; Azad, A.K.M Abdul Malek
Bangladesh is predominately an agriculture-based country, which faces uncertain crop yields and inefficient farming infrastructure resulting in adverse effect in food security. Habiganj is selected as the study area because of its vulnerability to floods and drought due to its unique terrain. This paper aims to present a combinational agricultural mapping and monitoring of Habiganj with crop growth and yield prediction. Multi-spectral band images of Habiganj from Landsat 8 are processed and remote sensing indices are extracted. With options of K-means and Mask R-CNN methods, crop growth is evaluated using both Python and MATLAB. Then using two type of machine learning algorithms crop yield of Habiganj is predicted from its existing parameters and the datasets are predicted by using two type of time series model. Furthermore, comparative studies are concluded between two platforms and time series model to determine the most suited environment for this research purpose.
CardiSim: a cost-effective electrocardiogram simulator for medical training and research
(BRAC University, 2024-10) Anonna, Affifa Jahan; Alvi, Md. Saadman Sakib; Anik, Md. Imtiaz Ahammed; Noman, Abdullah Al; Azad, A.K.M Abdul Malek; Rafi, Md. Rafiqul Islam; Saima, Sabrina
In this project, we developed a microcontroller-based ECG Simulator capable of simulating 12 different cardiac diseases. The main goal of the system is to provide a cost-effective, portable, and reliable tool for medical training, enabling educators and trainees to study various abnormal ECG patterns, thereby supporting diagnosis and skill development. The simulator is powered by an Arduino Mega microcontroller, which generates ECG waveforms representing different heart conditions, including Sinus Rhythm, Tachycardia, Bradycardia, and more. The device features an interactive interface with an OLED display and push buttons, allowing users to select from the 12 disease simulations. The OLED screen displays the disease names, and users can easily navigate, select, and exit simulations using the buttons. Once a disease is selected, a mini-oscilloscope shows the corresponding ECG waveform. The lightweight design ensures the device is highly portable, making it suitable for medical training and research. The simulator has been tested to generate clear, distinct waveforms that can also be displayed on external monitors for further analysis. This project offers an accessible, practical solution for simulating complex cardiac conditions, making it a valuable tool for the medical field without requiring expensive or invasive equipment.
Comprehensive mathematical analysis and simulation design of a microwave wireless power transmission system
(BRAC University, 2019-04) Meem, Afrin Sultana; Faisal, Abrar; Tarafder, Pulok; Henry, Bukenya; Azad, A.K.M Abdul Malek; Sabuj, Saifur Rahman
Wireless power transmission, an idea first proposed and demonstrated by Nikola tesla in the beginning of the 20th century has seen immense improvement up until date, with the latest developments in the field including wireless charging of electronics having already graced the consumer market. In this paper, tremendous focus is put into improving the efficiency of the system, notably, the antennae efficiency, specific waveforms used to in transmission to achieve optimal efficiency. First, the non-uniform antenna array is designed and discussed. Additionally, mathematical analysis and software simulation designs of rectenna division, specifically, the rectifier part were performed. Consequently, a special type of rectifier known as the class F rectifier is discussed in detail simulated with different diode models to show the different improvements in the efficiency of the system depending on the type of diode used. Four waveforms were also compared, and simulation results given and compared to experimental results done in earlier work.
Design and implementation of an appropriate motor controller to improve the range of an e-bike
(BRAC University, 2023-04) Ridwan, Rafid; Oishi, Fariha Tabassum; Sadab, Md. Shahed; Rafid, Md.; Azad, A.K.M Abdul Malek; Rahman, Touhidur
According to statistics, riders want to use their electric bicycles for longer trips but are constrained by their batteries' short lifespan. Nowadays electric bicycles can be modified with many different electrical mechanisms that can enhance the travel distance covered by the bike. Most often a rider wants to use a system that can give more range coverage than the regular electric bike with the bike having a simple system rather than some extra attachments on the bike to enhance the ease of riding. In order to lengthen the trip distance and battery life of an electric bicycle, this paper explores an effective approach to apply and regulate a regenerative braking system for an electric bike. The groundwork for creating a better-performing electric bike with a regenerative braking system that could be fitted to any widely accessible electric bicycle conversion kit is being assembled and experimented with in this study.
Design of a solar powered miniature water surface cleaning robot
(Brac University, 2023-08) Sagor, Md Asaduzzaman; Saha, Sanglap; Hasan, Rifat; Haque, Mazeedi; Azad, A.K.M Abdul Malek; Rahman, Touhidur; Imran, Mohammad Tushar
According to study, there is a growing demand for solar-powered water surface cleaning robots that can effectively clean larger areas without being limited by battery life. Current water surface cleaning robots can be modified with various electrical mechanisms to enhance their cleaning capacity. Most users prefer a system that provides extended cleaning range while maintaining simplicity, without the need for additional attachments or complex setups. This paper aims to explore an efficient approach to implementing and regulating a solar-powered system for water surface cleaning robots. The objective is to develop a high-performing water surface cleaning robot with a solar-powered system that can be easily integrated into existing widely available conversion kits. This study aims to lay the groundwork for creating a more efficient and effective solution for water surface cleaning robots. By harnessing solar power, the robot's battery life and cleaning range can be significantly extended, allowing for longer and more thorough cleaning operations.
Improvement of energy efficiency and effectiveness of cooking in solar electric slow cooker for tropical countries
(BRAC University, 2019-12) Hasan, Rayed Md. Muhaymin; Islam, Nahian; Khan, Mehrab Azam; Azad, A.K.M Abdul Malek
The cooking system has been evolving for a long time. From the parabolic system to solar cooking. Every method had its unique concepts. Attempts towards solar cooking have always been proven beneficent and successful. Solar cooking is a system where energy comes from the photovoltaic solar panel which is functional to solar. Solar energy is renewable energy. Renewable energy is currently the biggest R&D at this moment. The amount of non-renewable energy is decreasing day by day and increasing global warming simultaneously. Bangladesh is at no different point. We have very limited non-renewable energy and it's decreasing day by day. Only 6% of the country's total population has access to natural gas, primarily in urban areas. Keeping in mind the potential of solar energy, our goal is to design an electric stove that will use solar energy. The main source of power is solar in addition to 48V batteries as back up and the main grid as emergency backup. This system is run by two burners which are controlled by a heat controller. The batteries are charged by photovoltaic solar panels when the batteries are not being used. Heat controllers are also used to vary the temperatures. As it is called an improved version, this stove is structured over verification of a double burner stove named "Performance and Testing of the Improved Solar Electric Cooking System". In this improved version we have worked to bring out some significant changes involving size, material, cost, cooking time and design. Here we have presented a comprehensive study over performance-based and test analysis between both stoves comparing theoretically, experimentally, and development works. To justify our result, impedance has been matched to get the maximum output power. Cooking time data and input power vs output power data has been analyzed to obtain optimum results. To compare the effectiveness as compared to natural gas, this thesis has several analyzed data that were taken under different electrical components or materials. Finally, we have come up with the best and effective solution for the urban areas of the country which will help to reduce the usage of non-renewable gas and electricity too.
Performance and analysis of DC-AC pure sine wave inverter
(BRAC University, 12/8/2010) Purification, Paul; Azad, A.K.M Abdul Malek
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.
Solar battery charging station with automated switching system
(BRAC University, 8/28/2014) Islam, Rafiul; Hossain, Shakhwat; Showrav, Alaul Ashraf; Ayon, Asif Anjum; Azad, A.K.M Abdul Malek
In today’s environmentally conscious climate there is more and more interest being taken in alternative forms of power supply. Bangladesh is witnessing a significant increase in solar energy generation as a part of renewable energy generation as a safety net for the shortage of conventional power sources (coal, oil, gas etc.). Solar energy can be produced and converted to electrical energy via solar panels and then stored in batteries which can then be used for multiple household and commercial purposes. This project deals with the modified design of the pilot project, SBCS or Solar Battery Charging Station. This project is an attempt to assist the urban and rural areas with eco-friendly and cheap electricity supply, decreasing the load on the national grid in the process. The batteries charged in the process can also be used by electricity-driven rickshaws that will be helpful for those rickshaw pullers who are either old or physically handicapped. The implementation of the project includes charging 48-volts battery sets using two 200W solar panels providing discrete amount of power at different times of the day. In addition to that the project also includes an automated switching system by which the station will shift to backup power to charge the batteries if the solar irradiance is too low for the batteries to be charged in a given time constrain. This paper gives a full description of the charging process, both by the solar panels and by national grid.