Conference Paper

Permanent URI for this collectionhttps://hdl.handle.net/10361/6957

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Design and implementation of a simple electromechanical system to reduce domestic gas wastage and accidents in South-Asia
(© 2012 IEEE, 2012) M. Huq, Rachaen; Hoque, Md. Anamul; Chakraborty, Partha; B. Jafar, Imran; Rahman, Khan H.; Department of Computer Science and Engineering
This paper elaborates design and implementation aspects of a system design project which aims at modernizing the current design of domestic gas-stoves with a simple electromechanical sensor-integrated system in order to reduce wastage of gas and accident possibilities in South-Asian households. Statistics show that a significant amount of natural gas is wasted every day in the domestic cooking purpose because of the ignorance of the users by keeping the gas line on even after cooking is done, or during breaks. One of the two major portions of the proposed system will sense the situation of 'activity' of the stove (idle or cooking); the other will sense the state of the gas knob (on or off) and send signals to the controller-unit accordingly. Both of these electromechanical sensors were designed and implemented in this project. If the stove remains 'idle' and gas-line is 'on' for a specific amount of time, say five minutes, the controller will automatically close the gas line. The gas line will again automatically 'open' when any of the above states changes (if the stove becomes 'active' or the line is manually closed). The system components were designed and implemented as a whole successfully. The proposed system can either be implemented as an external modification to the existing gas-stoves or can be industrially integrated to make the next-generation energy saving stoves.
Simulation and analysis of battery performance of a solar car using a model implemented in simulink
(© 2015 Institute of Electrical and Electronics Engineers Inc., 2015-12) Al Maliniud, Abdullah; Zaman, Asif; Jafar, Imran Bin; Department of Computer Science and Engineering
Battery performance of a proposed solar car has been investigated under different road conditions while the car makes a nip in one of the longest routes in Dhaka city, using a model developed in Matlab Simulink. A significant reduction in energy consumption is observed when the car runs at lower speed, which is atthbuted to lower air drag at lower speed. Energy consumption further reduces with the increase in number of stoppages. Thus the solar/electric car will be an ideal mode of transport for a city like Dhaka, where traffic congestion is a daily occurrence.
Performance study of lead-acid battery in a solar car under different traffic and weather conditions
(© 2016 Institute of Electrical and Electronics Engineers Inc., 2016-01) Mahmud, Abdullah Al; Jafar, Imran Bin; Zaman, Asif; Rahman, Mosaddequr Abdur; Department of Computer Science and Engineering
In this paper performance of lead-acid battery in a solar car, proposed earlier for Dhaka city dwellers, has been studied under different traffic and weather conditions while the car travels in a long route of Dhaka city. A model of the electric drive system of the proposed car, developed in Matlab Simulink, is used to investigate the battery response. It has been observed that the energy required by the car when it travels 30% of the road at the top speed of 60 km/hour is about 65% of the energy required when it travels 90% of the road at that speed, which further decreases with the increase of number of stoppages. Because of this feature, the proposed solar car appears to be an appropriate means of transport in Dhaka, the city with quotidian traffic congestion. In addition of being emission free, it also ensures less energy consumption during heavy traffic congestion compared to a fuel driven car which burns more fuel and releases more toxic gases under the same road conditions.
Mixed FBB and RBB low leakage technique for high durable CMOS circuit
(© 2014 IEEE Computer Society, 2014) Barua, Parag; Jafar, Imran Bin; Sengupta, Prianka; Noor, Md Sadaf; Department of Electrical and Electronic Engineering
CMOS logic circuit is extensively used for designing low power Very Large Scale Integration (VLSI). Reducing the dimension of CMOS in a nanometer range, functionality and efficiency can be increased, but as a result we have to compromise with circuit level leakage. As circuit level leakage also known as leakage current is currently one of the major concernments to the VLSI designers. These Leakage currents are generated due to different types of leakage current components such as Weak inversion current, Drain-induced barrier lowering (DIBL), Gate-induced drain leakage and Oxide leakage tunneling. However, there are wide ranges of method that are already available to reduce these leakages, but all of them have their own tradeoffs. In this paper we propose a novel technique by integrating the idea of Forward Back Bias (FBB) and Reverse Back Bias (RBB) which reduces leakage extensively than sleepy stack, stacked sleep, variable body biasing and dual sleep. Furthermore, RBB and FBB are yielded with forced stacked transistors where RBB is accountable for nullifying the leakage and FBB is responsible for offsetting the delay penalty. The proposed method is scrutinized under 22nm to 65nm feature size, and it has come out that these novel schemes are especially very effective for designing the future low-voltage, low-power CMOS VLSI's [1]. Therefore, the main principle of this technique is to trim down leakages, but it has an obvious delay constraint that is considered as a tradeoff in this particular case.
Wireless monitoring system and controlling software for smart greenhouse management
(© 2014 IEEE Computer Society, 2014) Jafar, Imran Bin; Raihana, Kanij; Bhowmik, Sujan; Shakil, Shifur Rahman; Department of Electrical and Electronic Engineering
View at Publisher| Export | Download | Add to List | More... 2014 International Conference on Informatics, Electronics and Vision, ICIEV 2014 2014, Article number 6850748 2014 International Conference on Informatics, Electronics and Vision, ICIEV 2014; Dhaka; Bangladesh; 23 May 2014 through 24 May 2014; Category numberCFP1444S-PRT; Code 106648 Wireless monitoring system and controlling software for Smart Greenhouse Management (Conference Paper) Jafar, I.B. , Raihana, K. , Bhowmik, S. , Shakil, S.R. Department of Electrical and Electronic Engineering, BRAC University, Dhaka, Bangladesh View references (12) Abstract In this work, a wireless control system with a subsequent software have been designed and practically implemented to establish the Smart Greenhouse Management. Here, the control system can repeatedly handle vital factors for plants according to the real time clock set with microcontroller and routinely carry out wireless transmission of sensors' information to remote software (Implemented using MS Visual Studio 2010) for any further analysis. Moreover, the essential factors, Sunlight, Temperature and Humidity are controlled by the whole system. Particularly, a sensing network running by ATmega328 microcontroller based Arduino UNO Module was exclusively deployed to digitally process analog value of sensors attached to plants and for communication purpose, a wireless 433MHz ASK and 2.4GHz ISM band radio frequency based nRF24L01+PA+LNA Transmitter-Receiver pair were also installed to transmit or receive these information for succeeding analysis and supporting decisions. Finally, an apt care of data acquisition from the sensors, increasing overall productivity by means of algorithms have been observed and performed analysis in a meticulous way, which have made the exertion of Smart greenhouse different from any customary greenhouses that are available in market.
Theoretical modeling of current measurement in nanoscale device considering Green's function formalism
(© 2015 Institute of Electrical and Electronics Engineers Inc., 2015) Hassan, Asif S.; Mondol, Raktim Kumar; Jafar, Imran Bin; Shahin, Md Zahidul Islam; Department of Electrical and Electronic Engineering
In recent years there are various way of predicting the current measurement through nanoscale device has been established. One of the most widely used and accepted is non-equilibrium Green's function method (NEGF). After NEGF method is approached scientist has worked a lot for describing the electronics characteristics in an easier way. Among them recursive algorithm is easier way of analyzing the electronics behavior through nanoscale devices only by mathematical modeling. By incorporating the Dyson's approximation and recursive algorithm, charge density is calculated for a definite nanostructured materials. In this paper we will first observe Dyson's approximation for calculating charge density as well as current density through the nanoscale devices. By using a unique and same dimension like length in all direction we will then calculate the current through the nanoscale device.
Simulation of saturation current in In1-xGaxSb based solar cell
(© 2015 Institute of Electrical and Electronics Engineers Inc., 2015) Hassan, Asif S.; Mondol, Raktim Kumar; Jafar, Imran Bin; Department of Electrical and Electronic Engineering
After the golden era of silicon, nowadays compound semiconductors from III-V group is extensively studied to observe their application in electronic as well as in other field. Solar cell which is providing alternative source in our industries, houses and laboratories. Researchers are now trying to find out new features by using these inorganic materials based solar cell which can easily be paved the way of better controlling and maximizing the efficiency. In previous literature, InSb and GaSb based solar cell has already been studied. In this paper, In1-xGaxSb based solar cell is analyzed through their electronic responses. Here, we will observe the bandgap energy response for different proportion of gallium, temperature dependent energy, temperature dependent saturation current which will help in predicting a good level of solar efficiency.
Prospect and implementation of telemedicine centers in south Asian countries
(© 2015 Institute of Electrical and Electronics Engineers Inc., 2015) Jafar, Imran Bin; Shahin, Md Zahidul Islam; Chakraborty, Partha; Department of Electrical and Electronic Engineering
In this paper a sensor based Remote Patient Diagnosing Center is implemented and the prospect of telemedicine in south Asian countries are analyzed accordingly. A computer with sensors and interfacing devices are dedicated to build the complete remote diagnosing center. Hence, to extract signals from the body of patient, combinational networks of sensors are attached to the patient. Electrocardiogram (ECG) signal, Blood-oxygen saturation (SpO2) level, Temperature and Blood Pressure are basically measured using the corresponding sensors and doctors would be able to interact with patients in real-time via internet. To process and accumulate the data of extracted Bio-Signals, a dedicated microcontroller is employed in this research. Moreover, several subroutines are called for each work by microcontroller. Additionally a Graphical User Interface (GUI) is developed to exhibit and record all the information including the details of patient. In the GUI, values of different sensors would be updated simultaneously for different patients and these are observed in real time via internet for the live analysis by doctor from a remote location. Therefore, unprivileged patients from rural community or secluded locations can get proper medical help from a specialized urban doctor which will actually contribute to promote the practice of telemedicine. Finally, experimental results of ECG signal processing, percentage of SpO2 levels, Temperature and Blood Pressure are presented in this paper.

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