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Electrical and Computer Engineering
Florida International University
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Full-Text Articles in Engineering
Cbrs Spectrum Sharing Between Lte-U And Wifi: A Multiarmed Bandit Approach, Imtiaz Parvez, M.G.S. Sriyananda, Ismail Guvenc, Mehdi Bennis, Arif I. Sarwat
Cbrs Spectrum Sharing Between Lte-U And Wifi: A Multiarmed Bandit Approach, Imtiaz Parvez, M.G.S. Sriyananda, Ismail Guvenc, Mehdi Bennis, Arif I. Sarwat
Electrical and Computer Engineering Faculty Publications
The surge of mobile devices such as smartphone and tablets requires additional capacity. To achieve ubiquitous and high data rate Internet connectivity, effective spectrum sharing and utilization of the wireless spectrum carry critical importance. In this paper, we consider the use of unlicensed LTE (LTE-U) technology in the 3.5 GHz Citizens Broadband Radio Service (CBRS) band and develop a multiarmed bandit (MAB) based spectrum sharing technique for a smooth coexistence with WiFi. In particular, we consider LTE-U to operate as a General Authorized Access (GAA) user; hereby MAB is used to adaptively optimize the transmission duty cycle of LTE-U transmissions. …
Securing Metering Infrastructure Of Smart Grid: A Machine Learning And Localization Based Key Management Approach, Imtiaz Parvez, Arif I. Sarwat, Longfei Wei, Aditya Sundararajan
Securing Metering Infrastructure Of Smart Grid: A Machine Learning And Localization Based Key Management Approach, Imtiaz Parvez, Arif I. Sarwat, Longfei Wei, Aditya Sundararajan
Electrical and Computer Engineering Faculty Publications
In smart cities, advanced metering infrastructure (AMI) of the smart grid facilitates automated metering, control and monitoring of power distribution by employing a wireless network. Due to this wireless nature of communication, there exist potential threats to the data privacy in AMI. Decoding the energy consumption reading, injecting false data/command signals and jamming the networks are some hazardous measures against this technology. Since a smart meter possesses limited memory and computational capability, AMI demands a light, but robust security scheme. In this paper, we propose a localization-based key management system for meter data encryption. Data are encrypted by the key …
Structural Stability Of Functionalized Silicene Nanoribbons With Normal, Reconstructed, And Hybrid Edges, Sadegh Mehdi Aghaei, Ingrid Torres, Irene Calizo
Structural Stability Of Functionalized Silicene Nanoribbons With Normal, Reconstructed, And Hybrid Edges, Sadegh Mehdi Aghaei, Ingrid Torres, Irene Calizo
Electrical and Computer Engineering Faculty Publications
Silicene, a novel graphene-like material, has attracted a significant attention because of its potential applications for nanoelectronics. In this paper, we have theoretically investigated the structural stability of edge-hydrogenated and edge-fluorinated silicene nanoribbons (SiNRs) via first-principles calculations. Various edge forms of SiNRs including armchair edge, zigzag edge, Klein edge, reconstructed Klein edge, reconstructed pentagon-heptagon edge, and hybrid edges have been considered. It has been found that fully fluorinated Klein edge SiNRs, in which each edge Si atom is terminated by three fluorine atoms, are the most stable structure. We also discovered that a hybrid edge structure of trihydrogenated Klein edge …
Cbrs Spectrum Sharing Between Lte-U And Wifi: A Multiarmed Bandit Approach, Imtiaz Parvez, M. G. S. Sriyananda, Ismail Guvenc, Mehdi Bennis, Arif I. Sarwat
Cbrs Spectrum Sharing Between Lte-U And Wifi: A Multiarmed Bandit Approach, Imtiaz Parvez, M. G. S. Sriyananda, Ismail Guvenc, Mehdi Bennis, Arif I. Sarwat
Electrical and Computer Engineering Faculty Publications
The surge of mobile devices such as smartphone and tablets requires additional capacity. To achieve ubiquitous and high data rate Internet connectivity, effective spectrum sharing and utilization of the wireless spectrum carry critical importance. In this paper, we consider the use of unlicensed LTE (LTE-U) technology in the 3.5 GHz Citizens Broadband Radio Service (CBRS) band and develop a multiarmed bandit (MAB) based spectrum sharing technique for a smooth coexistence with WiFi. In particular, we consider LTE-U to operate as a General Authorized Access (GAA) user; hereby MAB is used to adaptively optimize the transmission duty cycle of LTE-U transmissions. …
Resonance Coupling In Plasmonic Nanomatryoshka Homo- And Heterodimers, Arash Ahmadivand, Raju Sinha, Nezih Pala
Resonance Coupling In Plasmonic Nanomatryoshka Homo- And Heterodimers, Arash Ahmadivand, Raju Sinha, Nezih Pala
Electrical and Computer Engineering Faculty Publications
Here, we examine the electromagnetic (EM) energy coupling and hybridization of plasmon resonances between closely spaced concentric nanoshells known as “nanomatryoshka” (NM) units in symmetric and antisymmetric compositions using the Finite Difference Time Domain (FDTD) analysis. Utilizing plasmon hybridization model, we calculated the energy level diagrams and verified that, in the symmetric dimer (in-phase mode in a homodimer), plasmonic bonding modes are dominant and tunable within the considered bandwidth. In contrast, in the antisymmetric dimer (out-of-phase mode in a heterodimer), due to the lack of the geometrical symmetry, new antibonding modes appear in the extinction profile, and this condition gives …
Smart Grid Security: Threats, Challenges, And Solutions, Anibal Sanjab, Walid Saad, Ismail Guvenc, Arif I. Sarwat, Saroj Biswas
Smart Grid Security: Threats, Challenges, And Solutions, Anibal Sanjab, Walid Saad, Ismail Guvenc, Arif I. Sarwat, Saroj Biswas
Electrical and Computer Engineering Faculty Publications
The cyber-physical nature of the smart grid has rendered it vulnerable to a multitude of attacks that can occur at its communication, networking, and physical entry points. Such cyber-physical attacks can have detrimental effects on the operation of the grid as exemplified by the recent attack which caused a blackout of the Ukranian power grid. Thus, to properly secure the smart grid, it is of utmost importance to: a) understand its underlying vulnerabilities and associated threats, b) quantify their effects, and c) devise appropriate security solutions. In this paper, the key threats targeting the smart grid are first exposed while …
Graphene Fets With Low-Resistance Hybrid Contacts For Improved High Frequency Performance, Chowdhury Al-Amin, Mustafa Karabiyik, Phani Kiran Vabbina, Raju Sinha, Nezih Pala
Graphene Fets With Low-Resistance Hybrid Contacts For Improved High Frequency Performance, Chowdhury Al-Amin, Mustafa Karabiyik, Phani Kiran Vabbina, Raju Sinha, Nezih Pala
Electrical and Computer Engineering Faculty Publications
This work proposes a novel geometry field effect transistor with graphene as a channel—graphene field-effect transistor (GFET), having a hybrid contact that consists of an ohmic source/drain and its extended part towards the gate, which is capacitively coupled to the channel. The ohmic contacts are used for direct current (DC) biasing, whereas their capacitive extension reduces access region length and provides the radio frequency (RF) signal a low impedance path. Minimization of the access region length, along with the paralleling of ohmic contact’s resistance and resistive part of capacitively coupled contact’s impedance, lower the overall source/drain resistance, which results in …
Optimal Operation Of Combined Photovoltaic Electrolyzer Systems, Arash Khalilnejad, Aditya Sundararajan, Alireza Abbaspour, Arif I. Sarwat
Optimal Operation Of Combined Photovoltaic Electrolyzer Systems, Arash Khalilnejad, Aditya Sundararajan, Alireza Abbaspour, Arif I. Sarwat
Electrical and Computer Engineering Faculty Publications
In this study, the design and simulation of a combination of a photovoltaic (PV) array with an alkaline electrolyzer is performed to maximize the production of hydrogen as a reliable power resource. Detailed electrical model of PV system, as long as thermal and electrochemical model of electrolyzer is used. Since an electrolyzer is a non-linear load, its coupling with PV systems to get the best power transfer is very important. Solar irradiation calculations were done for the region of Miami (FL, USA), giving an optimal surface slope of 25.7° for the PV array. The size of the PV array is …
Data Distribution Service-Based Interoperability Framework For Smart Grid Testbed Infrastructure, Tarek A. Youssef, Ahmed T. Elsayed, Osama A. Mohammed
Data Distribution Service-Based Interoperability Framework For Smart Grid Testbed Infrastructure, Tarek A. Youssef, Ahmed T. Elsayed, Osama A. Mohammed
Electrical and Computer Engineering Faculty Publications
This paper presents the design and implementation of a communication and control infrastructure for smart grid operation. The proposed infrastructure enhances the reliability of the measurements and control network. The advantages of utilizing the data-centric over message-centric communication approach are discussed in the context of smart grid applications. The data distribution service (DDS) is used to implement a data-centric common data bus for the smart grid. This common data bus improves the communication reliability, enabling distributed control and smart load management. These enhancements are achieved by avoiding a single point of failure while enabling peer-to-peer communication and an automatic discovery …
Performance Evaluation Of Optimal Photovoltaic-Electrolyzer System With The Purpose Of Maximum Hydrogen Storage, Arash Khalilnejad, Aditya Sundararajan, Arif I. Sarwat
Performance Evaluation Of Optimal Photovoltaic-Electrolyzer System With The Purpose Of Maximum Hydrogen Storage, Arash Khalilnejad, Aditya Sundararajan, Arif I. Sarwat
Electrical and Computer Engineering Faculty Publications
Power electronics-based electrolyzer systems are prevalently in current use. This paper proposes the more recently employed directly coupled photovoltaic (PV) electrolyzer systems. Equipped with accurate electrical models of the advanced alkaline electrolyzer, PV system and Hydrogen storage tank simulated using MATLAB, the system's performance for a full week is analyzed using Miami, Florida's meteorological data. A multi-level Genetic Algorithm (GA)-based optimization facilitates maximum hydrogen production, minimum excess power generation, and minimum energy transfer loss. The crucial effect of temperature on the overall system performance is also accounted for by optimizing this parameter using GA, maintaining operating conditions close to the …