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2,620 results on '"Azam, Muhammad"'

15. Real-Time Massive MIMO Channel Prediction: A Combination of Deep Learning and NeuralProphet

Author

Shehzad, Muhammad Karam, Rose, Luca, Azam, Muhammad Furqan, and Assaad, Mohamad

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

Channel state information (CSI) is of pivotal importance as it enables wireless systems to adapt transmission parameters more accurately, thus improving the system's overall performance. However, it becomes challenging to acquire accurate CSI in a highly dynamic environment, mainly due to multi-path fading. Inaccurate CSI can deteriorate the performance, particularly of a massive multiple-input multiple-output (mMIMO) system. This paper adapts machine learning (ML) for CSI prediction. Specifically, we exploit time-series models of deep learning (DL) such as recurrent neural network (RNN) and Bidirectional long-short term memory (BiLSTM). Further, we use NeuralProphet (NP), a recently introduced time-series model, composed of statistical components, e.g., auto-regression (AR) and Fourier terms, for CSI prediction. Inspired by statistical models, we also develop a novel hybrid framework comprising RNN and NP to achieve better prediction accuracy. The proposed channel predictors (CPs) performance is evaluated on a real-time dataset recorded at the Nokia Bell-Labs campus in Stuttgart, Germany. Numerical results show that DL brings performance gain when used with statistical models and showcases robustness., Comment: 6

Published
2022

22. Modelling spatiotemporal impact of flash floods on power distribution system and dynamic service restoration with renewable generators considering interdependent critical loads

Author

Suhail Afzal, Hazlie Mokhlis, Hazlee Azil Illias, Abdullah Akram Bajwa, Saad Mekhilef, Marizan Mubin, Munir Azam Muhammad, and Hussain Shareef

Subjects
disasters, hazards, micro grids, power system resilience, power system restoration, power systems, Distribution or transmission of electric power, TK3001-3521, Production of electric energy or power. Powerplants. Central stations, TK1001-1841
Abstract

Abstract In recent decades, flash floods have become more common because of climate change and are considered a substantial risk for many cities worldwide. This catastrophic natural hazard presents a significant threat to critical infrastructure in urban areas, particularly the power distribution system. As modern societies are much more dependent on electrical energy these days, it is essential and imperative to make existing distribution systems resilient against flash flooding. Although researchers in this area have proposed various algorithms to impart resilience to a distribution system, however, the focus in these works is on wind‐related events such as hurricanes, cyclones, and windstorms. Therefore, here, the spatiotemporal effects of a flash flood on the distribution system are modelled using a grid‐based hydrodynamic model. The evolving line faults are then included in the proposed resilience‐oriented time horizon‐based service restoration model that also considers dynamic load demand, heavy uncertainties related to renewable generation, and interdependence among critical loads. Finally, the resilience of the distribution system's response is assessed using an operational resilience metric. The efficacy of the proposed framework is evaluated on IEEE 33‐bus and 69‐bus systems and the results show that the model provides an efficient restoration solution despite increased complexity caused by varying conditions.

Published
2024
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42. Optimization of gallic acid-enriched ultrasonic-assisted extraction from mango peels

Author

Riaz Tuba, Hayat Zafar, Akram Kashif, Saleem Kinza, Rehman Hafeez ur, Azam Muhammad, Tariq Zara, Rehman Shafiq ur, Meraj Asif, Farooq Umar, and Shafi Afshan

Subjects
extraction, ethanol, mango peels, gallic acid, Chemistry, QD1-999
Abstract

Gallic acid is recognized as a notable bioactive compound among secondary polyphenolic metabolites. In the current study, gallic acid-enriched extracts were obtained from mango peels using different solvents (ethanol or water) via ultrasound-assisted extraction, and optimized yields were compared with the conventional extraction technique (decoction). Independent variables for the optimization through response surface methodology were ethanol concentration (0–60%), solvent ratio (10–50 mL/g), temperature (30–60℃), and time (10–30 min) for ethanolic extraction. However, extraction carried out by using water had extraction conditions of pH (2–8), solvent ratio (20–0 mL/g), extraction temperature (40–70℃), and time (30–60 min). The optimized yield of gallic acid obtained through ethanol was 5.75 ± 0.21 mg/g, whereas 3.14 ± 0.24 mg/g of gallic acid was quantified in extraction through water. The results were compared with the aforementioned conventional method of decoction, and it was concluded that the ethanolic extracts of mango peels showed the highest gallic acid yield and total flavonoid contents. The obtained extracts could be a potential source of polyphenolics, especially gallic acid, for use in nutraceuticals as well as in other food applications.

Published
2023
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43. A Systematic Review of the Effects of Practice, Exercise, and Sport Experience on Gap Interception Behavior.

Author

Azam, Muhammad, Gong, Zhaowei, Ali, Asif, and Chung, Hyun Chae

Subjects
RESEARCH personnel, SPORTS
Abstract

Researchers have studied human perception-action systems during interceptive tasks in real or virtual situations. Training and practice may enhance perception and action in dynamic gap interception tasks like crossing a road. For relevant studies, we thoroughly searched PubMed, PsycINFO, ScienceDirect, ResearchGate, and SPORTDiscus. We reviewed and summarized research to determine how task-specific practice, exercise, and sports experience affect perception-action capacities when intercepting a moving gap. Specifically, we examined how sports experience influences perception-action coupling in street crossing. Task-specific and sports skills may improve perception-action in everyday activities. Hence, task-specific practice and perception-action coupling in sports may increase perceptual-motor skills for dynamic gap interception tasks. [ABSTRACT FROM AUTHOR]

Published
2024
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