Abu Sumeya Ahmed - Academia.edu (original) (raw)

Papers by Abu Sumeya Ahmed

Journal of Electron Spectroscopy and Related Phenomena

ECTI Transactions on Computer and Information Technology (ECTI-CIT)

The 5G wireless access technology will supersede its predecessor, 4G, in the current decade, at f... more The 5G wireless access technology will supersede its predecessor, 4G, in the current decade, at first coexisting with it and later as a standalone technology. This work examines and compares the performance of the following orthogonal multicarrier schemes: Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM), Windowed Orthogonal Frequency Division Multiplexing (W-OFDM), Filtered Orthogonal Frequency Division Multiplexing (F-OFDM), Universal Filtered Multi-Carrier (UFMC), and Filter Bank Multi-Carrier (FBMC). The system architecture of each scheme is investigated while considering the performance in fading channel models. The simulation was performed using a standard set of parameters, and the performance was appraised based on Power Spectral Density (PSD), Peak to Average Power Ratio (PAPR), Complementary Cumulative Distribution Function (CCDF) of PAPR, Bit Error Rate (BER), and Signal to Noise Ratio (SNR). In addition, a comprehensive analysis is presented concerning ...

Developments and Advances in Intelligent Systems and Applications, 2017

One of the major barriers for full adoption of cloud computing is the security issue. As the clou... more One of the major barriers for full adoption of cloud computing is the security issue. As the cloud computing paradigm presents a shared management vision, it is important that security requirements are addressed inside the Service Level Agreements (SLAs) established between cloud providers and consumers, along with the tools and mechanisms necessary to deal with these requirements. This work aims at proposing a framework to orchestrate the management of cloud services and security mechanisms based on the security requirements defined by a SLA, in an automated manner, throughout their lifecycles. In addition, the integration of the framework with a cloud computing solution is presented, in order to demonstrate and validate the framework support throughout SLAs lifecycle phases.

2017 3rd International Conference on Electrical Information and Communication Technology (EICT), 2017

We have proposed the design of a compact microstrip antenna structure having two physically separ... more We have proposed the design of a compact microstrip antenna structure having two physically separated ports perpendicular to each other. The antenna has been designed on Defective Ground Structure (DGS) which is capable of providing improved performance. Moreover, we have designed a microstrip-fed line with the slot-added patch. The design and simulation procedure has been conducted using CST STUDIO SUITE as well as several parameters such as Return Loss (RL), Voltage Standing Wave Ratio (VSWR), and radiation pattern have been analyzed. The simulation result verifies that the proposed antenna offers enhanced performance since the better value has been obtained for the performance parameters. Therefore, the proposed antenna can be used efficiently for various wireless applications.

2018 International Conference on Advancement in Electrical and Electronic Engineering (ICAEEE), 2018

Graphene nanoribbon is a probable alternative in observing transistor behavior due to its semicon... more Graphene nanoribbon is a probable alternative in observing transistor behavior due to its semiconducting properties. One of the fruitful investigations in transistor research is I-V characteristics by using proper bias voltage, in presence of capacitance. In this paper, we will observe the I-V characteristics of Armchair Graphene Nanoribbon (AGNR) by considering the quantum as well as the classical capacitance for two different sizes of AGNR which are 5.04nm and 10.20nm. These two cases will eventually help us concluding a valuable decision in sub-10 nm range based device analysis.

2018 International Conference on Computer, Communication, Chemical, Material and Electronic Engineering (IC4ME2), 2018

People with short-term memory or suffering from amnesia tend to forget the location of an object ... more People with short-term memory or suffering from amnesia tend to forget the location of an object where they placed it. An object detecting device may be useful not only for these particular people but also for the elderly and children. Moreover, this type of device has extensive application in monitoring, tracking, and exploration purposes. In this paper, we have proposed an affordable prototype of an object finding device which costs only 7.09 USD that can operate with up to 98.96 percent efficiency.

2018 21st International Conference of Computer and Information Technology (ICCIT), 2018

The disability to control different limbs of human body is a major obstacle in which many people ... more The disability to control different limbs of human body is a major obstacle in which many people suffer from. This might be inherent or occur due to an accident. Their day-to-day activities are impeded by immobility and they are segregated from various social events to an extent. For the patients suffering from quadriplegia whose entire body is paralyzed, motorized mechanical systems such as wheelchair are not sufficient enough. A simplistic approach of an automated wheelchair has been proposed here which can be operated by directional eye movement using electrooculography (EOG) signal. After proper assembly the performance appraisal justifies the proposed prototypes effectiveness.

The number of wind turbines connected to power grids has significantly increased during the last ... more The number of wind turbines connected to power grids has significantly increased during the last decade. This is mainly due to the convincing revolution in power electronic technology and the growing concern about greenhouse effect that is intensified due to the burning of fossil fuels. Variable-speed wind energy conversion systems (WECSs) such as doubly fed induction generators (DFIGs) are dominating the wind energy market due to their superior advantages over fixed-speed-based WECS which include more captured energy, less mechanical stress, and acoustical noise. DFIG is interfaced to the ac network through the grid-side voltage source converter (VSC) and rotor-side VSC to enable the variable-speed operation of the wind turbine and to provide reactive power support to the ac grid during disturbance events. Converter switching malfunction such as misfire and fire-through may influence the power dispatch capability of the DFIG. In this paper, a superconducting magnetic energy storage...

2017 IEEE International Conference on Telecommunications and Photonics (ICTP), 2017

Early detection of dental caries is vital as it causes several fatal diseases like cancer if it s... more Early detection of dental caries is vital as it causes several fatal diseases like cancer if it spreads into the root of the teeth. Therefore, early detection, tracking, and testing the depth of carious lesion may be lifesaving. In this paper, a carious detection method has been presented, and the volume of caries has been investigated. We have applied K-means clustering and threshold method for segmentation and utilized Computed Tomography (CT) images in order to construct the three-dimensional view of the carious lesion which is an integral part of the diagnosis of dental cavity. Result shows that the average Peak Signal-to-Noise Ratio (PSNR) has been obtained 19.98 and 20 by applying K-means clustering and threshold method respectively along with satisfactory visual interpretation of the three-dimensional structure of dental carries. This contribution can be applied for several other medical detection purposes with a slight adjustment.

The Journal of the American Dental Association, 2021

Background During the COVID-19 pandemic, American Society for Testing and Materials level 3 and l... more Background During the COVID-19 pandemic, American Society for Testing and Materials level 3 and level 2 medical face masks (MFMs) have been used for most health care workers and even for the first responders owing to a shortage of N95 respirators. However, the MFMs lack effective peripheral seal, leading to concerns about their adequacy to block aerosol exposure for proper protection. The purpose of this study was to evaluate the peripheral seal of level 3 and level 2 MFMs with a 3-dimensional (3D-) printed custom frame. Methods Level 3 and level 2 MFMs were tested on 10 participants with and without a 3D-printed custom frame; the efficiency of mask peripheral seal was determined by means of quantitative fit testing using a PortaCount Fit Tester based on ambient aerosol condensation nuclei counter protocol. Results The 3D-printed custom frame significantly improved the peripheral seal of both level 3 and level 2 MFMs compared with the masks alone (P < .001). In addition, both level 3 and level 2 MFMs with the 3D-printed custom frame met the quantitative fit testing standard specified for N95 respirators. Practical Implications The 3D-printed custom frame over level 3 and level 2 MFMs can offer enhanced peripheral reduction of aerosols when using collapsible masks. With the shortage of N95 respirators, using the 3D-printed custom frame over a level 3 or level 2 MFM is considered a practical alternative to dental professionals.

BioResources, 2021

The morphological and thermal properties of composites containing a bioplastic blend and micro/na... more The morphological and thermal properties of composites containing a bioplastic blend and micro/nano-sized biochar from pyrolyzed jatropha seeds from microwave pyrolyzed jatropha seeds were investigated using scanning electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and differential scanning calorimetry. The biocomposite samples exhibited a brittle structure with a slightly ductile chip-like appearance. The Fourier transform infrared spectroscopy results for the PLA/PEMA/BC bio-composites were comparable to the PLA/BC biocomposites. A lower bio-filler content had more pronounced peak intensities than the higher bio-filler content biocomposites. The added PEMA compatibilizer in the PLA/PEMA/BC biocomposite showed more pronounced peaks, which indicated slightly improved bonding/interaction between the bio-filler and the matrix. Overall, increasing bio-filler content did not drastically affect the functional groups of the biocomposites. Thermogra...

Annals of Telecommunications, 2020

In mobile communication, User Equipment (UE) authenticates a subscriber to a Mobile Network Opera... more In mobile communication, User Equipment (UE) authenticates a subscriber to a Mobile Network Operator (MNO) using credentials from the MNO specified SIM profile that is securely stored inside the SIM card. Traditionally, a change in a subscriber’s SIM profile, such as a change in a subscription, requires replacement of the physical SIM card. To address this shortcoming, the GSM Association (GSMA) has specified the consumer Remote SIM Provisioning (RSP) protocol. The protocol enables remote provisioning of SIM profiles from a server to SIM cards, also known as the embedded Universal Integrated Circuit Card (eUICC). In RSP, any GSMA-certified server is trusted by all eUICCs, and consequently any server can provision SIM profiles to all eUICCs, even those not originating from the MNO associated with the GSMA-certified RSP server. Consequently, an attacker, by compromising a server, can clone a genuine SIM profile and provision it to other eUICCs. To address this security problem, we pre...

Materials Science Forum, 2020

Heterogeneous catalyst has been viewed as a promising catalyst for biodiesel production. This stu... more Heterogeneous catalyst has been viewed as a promising catalyst for biodiesel production. This study employed Turritella terebra (TT) shell as a source for synthesizing heterogeneous CaO catalyst for biodiesel production via transesterification by utilizing chicken fat as a feedstock. The TT shell CaO catalyst was characterized and its catalytic performance was studied. The spectrographic methods that include FTIR, SEM, PSA, and BET-BJH were employed for characterization of the synthesized CaO. The TT shell CaO catalyst optimally produced chicken fat biodiesel (CFB) with reaction parameters at catalyst concentration of 4 wt%, chicken fat to methanol molar ratio of 1:12, reaction temperature of 60°C, and reaction time of 90 min. The optimal yield was 94.03% and the TT shell CaO catalyst still yield 79.19% of CFB on the fifth cycle of reaction. This study has implied that TT shell is a feasible and attractive renewable source of heterogeneous CaO catalyst for biodiesel production.

Advances in Astronautics Science and Technology, 2020

Rovers, ultimate automobile for the investigation of the nearby planetary group, are capable of a... more Rovers, ultimate automobile for the investigation of the nearby planetary group, are capable of assisting researchers in their exploration as well as the breakdown of the formation of Mars. In this research, we are proposing a model of wanderer which is fit for self-adjusting to various landscapes along with environments with the end goal of fruitful investigation. In addition, it is designed to make a trip to various zones, gather earth samples, measure pH, compute weight, screen different states of weather such as warmth, dampness and wind velocity, sense the formation of toxic gas, and not to mention conduct rescue mission. Notably, the wheels are constructed using buoyant substances like polyvinyl chloride (PVC). Moreover, a unique suspension framework is designed on the basis of the modified rocker-bogie system to make the wanderer adaptive to the uneven surface of Mars. Besides, a global positioning system (GPS) is incorporated with the vehicle so that its movement can be tracked and the prototype can roam autonomously. In other words, the rover is capable of conducting self-sustained exploration even if the condition is inhospitable. Another key point is that the proposed prototype is more cost-effective than the existing ones which have already been reported in the literature. As a result, the suggested model may have a decent potential not only in space exploration but also in the quest of life on Mars.

International Journal of Intelligent Robotics and Applications, 2019

In this research, we intend to present an enhanced object detection system incorporating a few we... more In this research, we intend to present an enhanced object detection system incorporating a few well-known computer vision techniques, machine learning algorithms, as well as smart sensors in a more organized way. In essence, a computer vision based system in cooperation with machine learning approach has been employed to detect objects in parallel with a hardwarebased ultrasonic sensor unit. The units can not only operate independently but also can cooperate in terms of detection result and hence, this type of approach can be termed as a cooperative object sensing system. Moreover, another key point is the prototype can determine free path to ensure smooth traversing which makes it effective in case of unforeseen scenario. By the same token, this prototype is also able to detect the type of object which is another compelling evidence of its novelty. With this intention in mind, we conducted a field test and evaluated its performance which justified the features specified above.

Sensors, 2018

Channel state information (CSI) collected during WiFi packet transmissions can be used for locali... more Channel state information (CSI) collected during WiFi packet transmissions can be used for localization of commodity WiFi devices in indoor environments with multipath propagation. To this end, the angle of arrival (AoA) and time of flight (ToF) for all dominant multipath components need to be estimated. A two-dimensional (2D) version of the multiple signal classification (MUSIC) algorithm has been shown to solve this problem using 2D grid search, which is computationally expensive and is therefore not suited for real-time localisation. In this paper, we propose using a modified matrix pencil (MMP) algorithm instead. Specifically, we show that the AoA and ToF estimates can be found independently of each other using the one-dimensional (1D) MMP algorithm and the results can be accurately paired to obtain the AoA-ToF pairs for all multipath components. Thus, the 2D estimation problem reduces to running 1D estimation multiple times, substantially reducing the computational complexity. We identify and resolve the problem of degenerate performance when two or more multipath components have the same AoA. In addition, we propose a packet aggregation model that uses the CSI data from multiple packets to improve the performance under noisy conditions. Simulation results show that our algorithm achieves two orders of magnitude reduction in the computational time over the 2D MUSIC algorithm while achieving similar accuracy. High accuracy and low computation complexity of our approach make it suitable for applications that require location estimation to run on resource-constrained embedded devices in real time.

2016 11th Iberian Conference on Information Systems and Technologies (CISTI), 2016

Security issues of cloud computing environments are considered a major challenge for its full ado... more Security issues of cloud computing environments are considered a major challenge for its full adoption. A Service Level Agreement (SLA) corroborates the shared management vision provided by the cloud computing paradigm, which can assist with related security issues. The necessity to address security requirements in cloud computing SLAs is considered important for both providers and consumers, along with the tools and mechanisms necessary to deal with these requirements. These issues are current research challenges; therefore, this paper aims at proposing a framework to orchestrate the management of cloud services based on security requirements defined by the SLA in an automated manner during its entire lifecycle. In addition, mechanisms to support the phases of the SLA lifecycle are proposed as a part of the framework. also the preliminary validation of the proposed framework. Finally, it is presented the integration of the framework with a cloud solution and in what manner the SLA lifecycle is supported by the framework.

Nigerian Journal of Basic and Applied Sciences, 2016

The presence of sulphur in crude oil poses enormous challenges as regards its negative environmen... more The presence of sulphur in crude oil poses enormous challenges as regards its negative environmental and economic impacts. As such, the safety of the personnel and the equipment is at high risk during the processing of Urals crude oil in Kaduna Refining and Petrochemical Company (KRPC) because of its sour nature. This study was aimed at reducing the sulphur content of the Urals crude oil prior to processing by subjecting it to oxidative desulphurization where peracetic acid was used as the oxidant in the actual mass-to-stoichiometric mass ratio ranging from 1 to 5. The oxidized sulphur compounds were thereafter extracted using acetic acid as the extraction solvent. Furthermore, atmospheric distillation was carried out on both the raw and the desulphurized crude oil samples. Finally, the sulphur contents of the various crude oil samples and their fractions were analyzed. The results showed drastic reductions in the sulphur contents up to actual mass-to-stoichiometric mass ratio of 2 but the reductions became progressively insignificant afterwards. Meanwhile, the highest reduction in the sulphur content of the crude oil was 61.6 % while those of the gasoline, kerosene, diesel and residue were 32.0, 45.1, 68.9 and 75.0 % respectively. Therefore, peracetic acid is an effective oxidant for oxidative desulphurization of the crude oil.

Carbon, 2015

Based on first-principles calculations, we explored the electronic and optical characteristics of... more Based on first-principles calculations, we explored the electronic and optical characteristics of undoped and doped graphene sheets with boron (B) and nitrogen (N) atoms. We carried out our calculations with a full-potential linearized augmented plane wave scheme based on density function theory. The valuable features such as, the band structure, density of states, and optical absorption are computed to explore the role of substitution by B and N atoms in graphene systems. Interestingly, the band structure calculations illustrate that the substitution of B atoms in graphene monolayers shifts the Dirac point upward to the Femi level; the substitution of N atoms has an opposite effect. Upon the doping with nitrogen or boron, n-type or p-type semiconducting would be obtained. Our results are in consensus with the available previous theoretical and experimental determinations. The optical absorption spectra are found to vary dramatically with doping concentration and the supercell size of graphene. Importantly, it is plausible to tailor the electronic properties of doped graphene sheets and attain reasonable results for various electronic nanodevice applications. This characteristic is due to the exceptional electronic structure and unique properties of two-dimensional graphene.

Proceedings of the International Engineering Conference, 2014

ABSTRACT The surface morphology of chemically treated jute fiber reinforced polyethylene composit... more ABSTRACT The surface morphology of chemically treated jute fiber reinforced polyethylene composites was investigated. Composites were prepared using hot press molding technique by varying jute fiber loading (5, 10, 15 and 20 wt.%) for both treated and untreated fibers. Raw jute fibers were chemically treated with benzene diazonium salt to increase their compatibility with the polyethylene matrix. Physical and mechanical properties were subsequently characterized. Tensile test was conducted for mechanical characterization as well as optimization of fiber content. Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) analysis was utilized to study surface morphology. It was observed that at 15 wt.% fiber content, composites exhibited the highest tensile properties. FTIR and SEM study showed better interfacial interaction between treated jute fiber and polyethylene matrix than raw one.