Mukter Zaman - Academia.edu (original) (raw)

Papers by Mukter Zaman

Abstract:- This paper describes the hardware implementation of a PID-type (Proportional- Integral... more Abstract:- This paper describes the hardware implementation of a PID-type (Proportional- Integral-Derivative) Fuzzy Logic Controller (FLC) algorithm using VHDL to use in transportation cruising system. The cruising system has developed to avoid the collisions between vehicles on the road. The PID-type FLC provides a reference for a car to either increase or decrease the speed of the vehicle depending on the distance of the preceding vehicle when it gets too close or alert the driver when necessary. The PID-type Fuzzy Controller algorithm is first developed using Matlab platform. The Mamdani Fuzzy Inference is studied and applied to design the PID-type Fuzzy controller hardware system. The controller system then is implemented using VHDL. The synthesis tool, Quartus II is used to synthesize the VHDL codes to obtain the Register Transfer Level (RTL) view of the FLC hardware. The motivation in designing is the Fuzzy based PID cruising controller is cheaper controller in cost compare to...

Abstract:- This paper describes the VHDL modeling of temperature controller based on fuzzy logic ... more Abstract:- This paper describes the VHDL modeling of temperature controller based on fuzzy logic intended for industrial application. The system is built of four major modules called fuzzification, inference, implication and defuzzification. The composition method selected for the fuzzy model is the Max-Min composition while the Mamdani Min operator was chosen as the implication method. Each module is modeled individually using behavioral VHDL and combined using structural VHDL. Following a successful VHDL coding, timing analysis was done verifying the functionalities of the algorithm with all simulated conditions. Simulation results show that the model has been tested successfully. The verified model of VHDL has synthesized using synthesis tool to get gate levels. The inferred maximum operating frequency is 5MHz with a critical path of 199.3ns.

This paper describes the VHDL modeling of temperature controller based on fuzzy logic intended fo... more This paper describes the VHDL modeling of temperature controller based on fuzzy logic intended for industrial application. The system is built of four major modules called fuzzification, inference, implication and defuzzification. The composition method selected for the fuzzy model is the Max-Min composition while the Mamdani Min operator was chosen as the implication method. Each module is modeled individually using behavioral VHDL and combined using structural VHDL. Following a successful VHDL coding, timing analysis was done verifying the functionalities of the algorithm with all simulated conditions. Simulation results show that the model has been tested successfully. The verified model of VHDL has synthesized using synthesis tool to get gate levels. The inferred maximum operating frequency is 5MHz with a critical path of 199.3ns.

This paper presents a designing of model for an autonomous mobile robot controller (MRC) hardware... more This paper presents a designing of model for an autonomous mobile robot controller (MRC) hardware with navigation concept using Fuzzy Logic Algorithm (FLA). The MRC enables with navigation for an unstructured environment to avoid any encountered obstacles without human intervention. The designed hardware architecture of autonomous mobile robot can be easily used in unstructured environments appropriately to avoid collision with obstacles by turning to the proper angle. Additionally, the FLA concept has proven a commendable intelligent solution in dealing for the certain control problems, when the situation is uncertain. In this paper, the designed hardware architecture of MRC has been performed with the concept of autonomous mobile robot controller using the theories of Fuzzy algorithm. The architecture blocks of the MRC consist of Fuzzifier, Fuzzy Rule Base, Inference mechanism and Defuzzifier. The model of MRC algorithm is first developed in MATLAB. After getting the confidence on...

International Journal of Engineering and Technology Innovation, 2019

Due to the limitation of Sub-threshold Swing (SS) of 60 mV/dec in CMOS, alternately Tunnel FETs (... more Due to the limitation of Sub-threshold Swing (SS) of 60 mV/dec in CMOS, alternately Tunnel FETs (TFETs) are more attractive in recent years since it has high energy efficiency and better switching performance even at a reduced voltage level. Because it has the benefits of Band to Band Tunneling (BTBT) behavior of operating mechanism and achieved a steep slope characteristic of less than 60 mV/dec. Despite these merits due to the band to band tunneling, the conventional Silicon based TFET is suffered from very low and limited ON-state current due to indirect and large energy gap feature. In the indirect band gap, the conservation of momentum occurs only when the absorption and emission of a photon are required which makes the absorption coefficient lower and limits the flow of electron. To address this problem, in this paper, a Hetero-Junction Tunnel FET (HTFET) devices employing with different lower bandgap materials (InAs/GaSb and InGaAs/InP) are designed by using Silvaco TCAD devi...

2019 IEEE Conference on Sustainable Utilization and Development in Engineering and Technologies (CSUDET), 2019

In this research, an atomization process was introduced to deposit carbon-based nanomaterials i.e... more In this research, an atomization process was introduced to deposit carbon-based nanomaterials i.e. graphene oxide (GO) on 200 mm silicon wafer for high volume production of a transparent conductive electrode (TCE). An ultrasonic spray coating process was used to deposit a stable dispersion of graphene oxide in ethanol on silicon and glass substrates. The thickness of the thin films can be controlled within a nanometer-scale with the high uniformity coating process. Functionalization of GO based on thermal reduction in Rapid Thermal Process (RTP) and Plasma Enhanced Chemical Vapour Deposition (PECVD) chambers was performed to make the GO electrically conductive and optically transparent. AFM measurements revealed that the thin film thickness has a strong correlation with the number of spray passes that can be translated into spray volume. It was discovered that the thin films demonstrate a good electrical conductivity with high optical transparency in the visible light. The sheet res...

2018 IEEE 7th International Conference on Photonics (ICP), 2018

Photovoltaic cell or commonly known as solar cell is an electrical device used to convert energy ... more Photovoltaic cell or commonly known as solar cell is an electrical device used to convert energy from light directly into electricity using the photovoltaic effect. Solar cells are categorized into many types. Thin film solar cells from the second generation are mostly used and have gained enormous interest among the research community. Thin film solar cells have a few common layers that deposit on substrate. The layers are known as back contact, absorUer layer (p type), window layer (n-type), and front contact layer. Cadmium, Indium, Gallium, and Selenium (CIGS) used as the absorber layer in the solar cell have been proven to achieve high efficiency. However, it is a well- known fact that indium and selenide in the stated compound are rare earth (RE) matenals, expensive, and toxic. Therefore, it is a requirement to identify an alternate type of material to use for the aUsorber layer that outains high efficiency as well. In view of this, significant research has been reported with C...

In this study, graphene-on-silicon process technology was developed to fabricate a power rectifie... more In this study, graphene-on-silicon process technology was developed to fabricate a power rectifier Schottky diode for efficiency improvement in high operating temperature. Trench-MOS-Barrier-Schottky (TMBS) diode structure was used to enhance the device performance. The main objective of this research was to study the effect of reduced graphene oxide (RGO) deposited on silicon surface for Schottky barrier formation and heat transfer in Schottky junction. The study showed RGO deposited on silicon as a heat spreader could help to reduce the effect of heat generated in the Schottky junction that leads to a leakage current reduction and efficiency improvement in the device. With comparison to the conventional metal silicide (titanium silicide and cobalt silicide), the leakage reduced by two-orders of magnitude when tested under high operating temperature (>100°C). TMBS rectifier diode that uses graphene-based heat spreader could produce highly reliable product able to withstand high ...

─ This paper presents the results of recent work based on finite element numerical modeling in An... more ─ This paper presents the results of recent work based on finite element numerical modeling in Ansoft HFSS to predict the surface transfer impedance of braided coaxial cables. Two approaches to the cable 3D modeling are investigated: (1) a simplified structural model, and (2) a rigorous structural model of braided shielded cable which is designed in Pro/Engineer software. The proposed approach provides a robust method that can overcome the challenges in the existing theoretical analysis. Factors influencing the cable transfer impedance are analyzed in detail. The validity of this simulation method is verified by comparison with a new measurement method based on time-domain response of two cable samples. The reliability of these two sets of data is analyzed by use of the feature selective validation method. Index Terms ─ Braided shield cable, feature selective validation method, finite element method, transfer impedance.

Indium sulphide (In x S y) is a prominent candidate to be an alternative buffer layer to so-calle... more Indium sulphide (In x S y) is a prominent candidate to be an alternative buffer layer to so-called toxic cadmium sulphide (CdS) in CIS based solar cells. In this study, buffer layer parameters layer thickness and buffer layer bandgap have been investigated by Solar Cell Capacitance Simulator (SCAPS) to find out the higher conversion efficiency. A promising result has been achieved with an efficiency of 16.76% (with V oc = 0.610 V, J sc = 34.63 mA/cm 2 and fill factor = 79.37) by using In X S y as a buffer layer. It is also found that the high efficiency of CIGS absorber layer thickness is between 1.5µm and 3µm. The bandgap of In x S y buffer layer was taken 2-2.9 eV to simulate which is related to the feasible value and In x S y bandgap is relatively higher compared to CdS buffer layer bandgap. Moreover, it is found that J sc is very high for the buffer layer thickness of 30-50nm and quantum efficiency is almost 80% in 350-500 nm region attributed to less absorption of light in the buffer layer. In addition, it is revealed that the highest efficiency cell can be achieved with the buffer layer bandgap of 2.74-2.90 eV. This result can be explained in the practical work as nonstoichoimetric composition of indium sulphide may result in different bandgaps. Hence, a specific non-stoichoimetry composition which results in the highest bandgap is desirable to achieve high efficiency In x S y-CIGS solar cells. From the simulation results, numerous influences of buffer layer are investigated in CIGS solar cell which can lead to the fabrication of high efficiency devices.

Applied Computational Electromagnetics Society Journal, 2015

─ A novel electromagnetically short antenna with parasitic microstrip cap shape is shown in this ... more ─ A novel electromagnetically short antenna with parasitic microstrip cap shape is shown in this paper. The antenna is composed of a U-shaped parasitic microstrip line (cap) excited by coupling with the feed line at patch. The antenna is fabricated in FR4 substrate with dielectric constant, Ԑr=4.55 and thickness of 1.6 mm. Optimization of the proposed antenna is done using modified Particle Swarm Optimization (PSO) algorithm in ZELAND IE3D software environment. That gives resonance at selected frequencies and increased gain than the initial design. By using circular slot at the ground plane with miniaturized structure, dualband covering 5.29 GHz to 5.89 GHz (C-band) and 7.93 GHz to 8.86 GHz (X-band) is achieved. A fractional bandwidth of 10.74% at C-band and 11.08% at X-band is achieved. A measured gain of 5.65 dBi and 6.61 dBi is achieved at C-band and Xband respectively, with a circular polarization. Gain improvement is achieved compared to the initial design by more than 2 dBi (a...

This paper describes the designing of PID-type (Proportional-Integral-Derivative) controller base... more This paper describes the designing of PID-type (Proportional-Integral-Derivative) controller based on Fuzzy algorithm using VHDL to use in transportation cruising system. The cruising system with Fuzzy concept has developed to avoid the collisions between vehicles on the road. The developed Fuzzy Logic Controller (FLC) provides a reference for controlling the vehicle speed either increase or decrease. The controlling speed depends on the distance of the preceding vehicle when it gets too close or alert the driver when necessary. The Mamdani Fuzzy Inference theory is studied, and developed in Matlab package at first for designing the PID-type FLC hardware system. The behavioral of the PID-type FLC algorithm is then simulated using VHDL language. The comparison of simulation results between Matlab and VHDL are presented for designing the PID-type hardware implementation. The synthesis tool from Quartus-II environment is chosen to synthesize the designed VHDL codes for obtaining the Register Transfer Level (RTL) hardware architecture of the PID modulus. The developed and designed Fuzzy based PID-type cruising controller is cheaper in cost compare to conventional PID controller system, and, thus we can propose this developed chip to use to the entry-level vehicles such as the national car. This can be further reduced the road accident and ensure the safety of the road users in the future.

Solar Energy Materials and Solar Cells

Abstract In this study, CdTe (up to 2.0 µm thick) and oxygenated CdS (CdS:O, up to 100 nm thick) ... more Abstract In this study, CdTe (up to 2.0 µm thick) and oxygenated CdS (CdS:O, up to 100 nm thick) films were deposited by magnetron sputtering and optimum conditions of film growth were investigated for CdS:O/CdTe solar cells. Favourable TeO 2 has been confirmed in XRD after the CdCl 2 heat treatment of the CdTe films. Moreover, improved structural, optical and electrical properties are observed in the CdCl 2 heat treated films. A detailed quantitative study has also been executed using XPS that finds sulfide, sulfate and an intermediate oxide as a function of oxygen content. In many cases, CdS contribution remains predominant, however, the CdSO x contribution increases with the increase of oxygen's partial pressure and decrease of growth rate. The complete solar cell device was fabricated of various CdTe thin films with different growth rates in sputtering. A highly resistive transparent (HRT) buffer layer ZnO:Sn was placed in between the FTO and CdS:O to avoid the forward leakage problem and screen printed C:Cu/Ag is used as the back contact for low cost fabrication. The J-V characteristics and external quantum efficiency (EQE) were measured for the solar cells under the illumination of AM 1.5G and the highest efficiency of 10.3% was achieved for the optimized CdTe growth rate of 5.4 A/s, while CdS:O growth rate was 0.25 A/s.

Journal of the American Ceramic Society

Journal of Electromagnetic Waves and Applications

Microporous and Mesoporous Materials

ChemistrySelect

This work reports the preparation of carbon monoxide (CO) oxidation catalysts based on gold nanop... more This work reports the preparation of carbon monoxide (CO) oxidation catalysts based on gold nanoparticles supported on mesoporous iron oxide nanocubes. By heat-treating Prussian blue (PB) nanocubes at various temperatures between 250-450 °C under air atmosphere, nanoporous iron oxide cubes with surface areas of up to 100 m 2 g-1 are obtained. Owing to the relatively large surface area and nanoporous structure, the as-synthesized iron oxide cubes can be loaded with up to 11 wt% of Au nanoparticles without significant aggregation. When employed as catalysts for CO oxidation, the Au-loaded nanoporous iron oxide cubes exhibit high CO conversion rate of over 95 % at room temperature under 0.1 L•min-1 of CO gas flow, with specific activity of up to 1.79 molCO•gAu-1 •h-1. The high catalytic performance of the Au-loaded nanoporous iron oxide cubes for CO oxidation is contributed by various factors, including: (i) the high surface area of the iron oxide cubes which lead to the availability of more sites for the adsorption of oxygen molecules to react with carbon monoxide to generate more carbon dioxide (CO2); (ii) the presence of nanopores which enhances the diffusivity of the reactant molecules during the catalytic reaction and improves dispersion of the deposited gold nanoparticles while also preventing their aggregation at the same time and (iii) the small size of the deposited gold nanoparticles (2-5 nm) which falls within the ideal size of gold nanoparticles for achieving high CO conversion.

Asian Journal of Scientific Research

American Journal of Applied Sciences

Investigation to optimize the synthesis process of graphene on conducting substrate is essential ... more Investigation to optimize the synthesis process of graphene on conducting substrate is essential for many applications. In this investigation suitable approach to extract graphene thin film on a conductive ITO substrate is optimized. This optimization is carried out by electrochemical Reduction of Graphene Oxide (RGO) solution utilizing a repetitive cyclic potential against reference electrode. To do this, Silver chloride reference electrode is employed within a three electrode system at a potential range of (0 to-1.5) V. A number of four consecutive cycles is used to obtain a negative reduction peak. Yet more importantly the material's electrochemical properties were studied by Cyclic Voltammetry (CV) operation. From CV, it is clear that, the surface area with electrodeposition from ITO to RGO/ITO and RGO/RGO/ITO rates in a potential window of (2V) for (-1 to 1) V is improved. Moreover, Electrochemical Impedance Spectroscopy (EIS) showed reduced electrode surface internal resistance of the modified electrode that dramatic decreased in comparison from 96.33kΩ of RGO/ITO to 32Ω of RGO/RGO/ITO. In addition, Charge/Discharge Cycle (CDC) is obtained that showed relatively symmetrical charging property along with its corresponding discharge equivalents viewing rapid charging/discharging process that favors redox process for increased mobility and thus conductivity improvement. Moreover the modified electrode was studied for its physical characteristics using Scanning Electron Microscopy (SEM) that showed uniform reduced graphene sheets deposition with particles diameter ranging from 1.65µm to 635nm. Atomic Force Microscopy (AFM) was used in contact mode for a square area of 5µm showing increased surface roughness from ITO of 2.773nm in comparison to Reduced Graphene Oxide/RGO/ITO 34.93nm. Results also proved that deposition of multiple layers of Graphene could strongly improve energy storage applications if implemented by allowing the material to hold greater charge in smaller area. This will lead to enhance the power densities far beyond existing electrochemical capacitors in a cost effective eco-friendly manner.

American Journal of Applied Sciences

It is reported that during the fabrication of doping RE ions into the silica preform, the distrib... more It is reported that during the fabrication of doping RE ions into the silica preform, the distribution of particles is inhomogeneous and becomes uneven throughout the fiber which lead to unwanted spectroscopic characteristics. It is assumed that by using thulium doped with alumina, the problem with the inhomogeneity of the particles inside the fiber can be solved. With the incorporation of alumina particles with thulium ions, the clustering effect and the ion-ion interactions between the ions can be prevented. In this research, thulium doped alumina nanoparticles will be synthesized by using sol-gel method to achieve particles within the nanoscale range of less than 100 nm in size, evenly distributed nanoparticles and high uniformity. The characterization activities will be perform by using optical microscope, FESEM, EDS and particle analyzer to identify the properties of the resulting solutions. By doping thulium with alumina nanoparticles, it is assumed that the amplification in the transmission systems can be increased and the conversion of passive optical fibers to active fibers can be achieved.

International Journal of Engineering and Technology Innovation, 2019

2019 IEEE Conference on Sustainable Utilization and Development in Engineering and Technologies (CSUDET), 2019

2018 IEEE 7th International Conference on Photonics (ICP), 2018

Applied Computational Electromagnetics Society Journal, 2015

Solar Energy Materials and Solar Cells

Journal of the American Ceramic Society

Journal of Electromagnetic Waves and Applications

Microporous and Mesoporous Materials

ChemistrySelect

Asian Journal of Scientific Research

American Journal of Applied Sciences