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Proposing an Energy-Aware Objective Function Based on Reinforcement Learning for Mobile IoT Networks
, M.Sc. Thesis Sharif University of Technology ; Ejlali, Alireza (Supervisor)
Abstract
The presence of IoT has been increased in different aspects of human life. Due to the increasing trend in the number of smart connected devices, routing has become a major challenge in loT systems. Furthermore, due to the energy-constrained embedded devices in the network, which are usually battery-powered, and considering that %97 of the node's energy consumption is due to activities associated with the transceiver module, the energy-aware routing is significantly important. In this regard, the IPv6 routing protocol for low-power and lossy networks (RPL) was standardized to be adopted in IoT infrastructure. Due to the increasing interest in mobile IoT applications in recent years and...
LANTERN: Learning-Based Routing Policy for Reliable Energy-Harvesting IoT Networks
, Article IEEE Transactions on Network and Service Management ; Volume 21, Issue 6 , 2024 , Pages 6542-6554 ; 19324537 (ISSN) ; Safaei, B ; Mahdi Hosseini Monazzah, A ; Oustad, E ; Rezagholi Lalani, S ; Ejlali, A ; Sharif University of Technology
2024
Abstract
RPL is introduced to conduct path selection in Low-power and Lossy Networks (LLN), including IoT. A routing policy in RPL is governed by its objective function, which corresponds to the requirements of the IoT application, e.g., energy-efficiency, and reliability in terms of Packet Delivery Ratio (PDR). In many applications, it is not possible to connect the nodes to the power outlet. Also, since nodes may be geographically inaccessible, replacing the depleted batteries is infeasible. Hence, harvesters are an admirable replacement for traditional batteries to prevent energy hole problem, and consequently to enhance the lifetime and reliability of IoT networks. Nevertheless, the unstable...
QUERA: Q-Learning RPL Routing Mechanism to Establish Energy Efficient and Reliable Communications in Mobile IoT Networks
, Article IEEE Transactions on Green Communications and Networking ; Volume 8, Issue 4 , 2024 , Pages 1824-1839 ; 24732400 (ISSN) ; Safaei, B ; Hosseini Monazzah, A. M ; Taghizadeh, H ; Henkel, J ; Ejlali, A ; Sharif University of Technology
2024
Abstract
Resource-limited mobile IoT networks are a dynamic, and uncertain wireless communicating system. In such systems, the standard RPL routing protocol cannot select long-lasting communication links due to not employing mobility-aware metrics, e.g., direction and speed of movements. While several classical heuristic approaches exist to improve PDR in RPL-based mobile networks, their solutions cannot adapt to alterations of the mobile topology. Hence, in this paper, by mapping the routing problem in mobile and resource-limited networks into an infinite-time horizon MDP, an energy-aware and reliable RPL-based routing mechanism based on Q-learning is proposed to improve PDR in mobile IoT networks....
REFER: A reliable and energy-efficient RPL for mobile IoT applications
, Article 3rd CSI/CPSSI International Symposium on Real-Time and Embedded Systems and Technologies, RTEST 2020, 10 June 2020 through 11 June 2020 ; July , 2020 ; Salehi, A. A. M ; Taghizadeh, H ; Safaei, B ; Hosseini Monazzah, A. M ; Ejlali, A ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2020
Abstract
Recently, IoT has been massively applied in different areas of human life. Meanwhile, in many of the IoT applications, e.g., the remote patient health-care monitoring systems, the reliability of communications, and the consumed energy in IoT devices, which are mostly battery-operated, are very challenging. Since IoT devices are typically operated in lossy environments, providing a reliable transmission for the packets imposes a noticeable amount of energy consumption. In addition, the runtime movement of the IoT devices in mobile networks further intensifies these issues. Therefore, the applied policies in the IPv6 RPL as the standard routing mechanism in IoT networks, play an important role...
Design and Synthesis of a Drug Delivery System Based on Mesoporous Bioactive Glass
, M.Sc. Thesis Sharif University of Technology ; Abdekhodaie, Mohammad Jafar (Supervisor)
Abstract
The aim of this research is to develop a smart mesoporous bioactive glass-based carrier for targeted drug delivery to cancer cells, particularly bone cancer cells. To achieve this, mesoporous bioactive glass nanoparticles were first synthesized, followed by surface modification with amine groups. To prevent premature drug release before reaching the target tissue and to introduce pH sensitivity, the nanoparticle pores were coated with oxidized hyaluronic acid via Schiff-base bonding with the amine groups on the surface. The use of hyaluronic acid facilitates active targeting of CD44 receptors, which are overexpressed on the surface of cancer cells compared to healthy cells. This process...
Electrodeposition of Pt nanostructures and its Application as Glucose Sensor
, Ph.D. Dissertation Sharif University of Technology ; Dolati, Abolghasem (Supervisor) ; Ghorbani, Mohammad (Supervisor)
Abstract
The present work describes sensing application of modified Pt nanostructures towards detection of glucose. Modified Pt nanostructured electrodes were prepared using electrodeposition method such as chronoampermetry and potentiostatic pulse methods. The electrodeposition of Pt nanostructures was first studied by voltammetry and amperommetry techniques and then potentiostatic pulse method has been used to produce the alloyed structures of platinum. In this regard, the first electrode was proposed based on alloyed Pt/Ni nanowire arrays (NWAs) for the non-enzymatic detection of glucose. The Pt/Ni NWAs were prepared by pulse electrodeposition of Pt and Ni within a nano-pore polycarbonate (PC)...
Quantum Estimation of Open Systems Using Extended Cramer-Rao Bounds
, M.Sc. Thesis Sharif University of Technology ; Rezakhani, Ali (Supervisor) ; Alipour, Sahar (Co-Advisor)
Abstract
Any physical system is characterized with some set of quantities or parameters, knowing which, is equivalent to estimation of the system. Evaluating such parameters is usually done using tomography methods. An important question to ask, is how to increase the precision of measurement, being able to do some specific set of physical operations, say, measurement?
this question is more important in parameter estimation in quantum meanical systems. It has been shown that, quantum meanics causes a fundamental limit, on precision of estimating su parameters, escribed by the so called “antum Cramér-Rao bound”.We must note that almost all quantum meanical systems are interacting with the...
this question is more important in parameter estimation in quantum meanical systems. It has been shown that, quantum meanics causes a fundamental limit, on precision of estimating su parameters, escribed by the so called “antum Cramér-Rao bound”.We must note that almost all quantum meanical systems are interacting with the...
Selective Transfection of Smart Polymeric Nanoparticles Into Reactive Astrocytes in Animal Model of Spinal Cord Injury
, Ph.D. Dissertation Sharif University of Technology ; Frounchi, Masoud (Supervisor) ; Mashayekhan, Shohreh (Co-Supervisor) ; Kiani, Sahar (Co-Supervisor)
Abstract
In this study, chitosan-based nanoparticles were prepared due to their biocompatibility, availability, high loading capacity of drug, stimulus responsive behavior and the presence of active functional groups. Chitosan was chemically functionalized with reactive oxygen species (ROS)-responsive moiety to respond to the oxidative stess and endosomal pH in nerve injuries. To prepare nanoparticles, functinalized chitosan ionically gelated with pH-responsive polyanions with ROS-scavenging properties such as polyacrylic acid and hyaluronic acid. Then, pH- and ROS-responsive nanoparticles were used for selective transfection into reactive astrocytes and axonal regeneration in spinal cord injuries....
Nanogold imprinted starch bionanocomposites for food packaging applications
, Article Starch Based Nanomaterials for Food Packaging: Perspectives and Future Prospectus ; 2023 , Pages 209-226 ; 978-044318967-8 (ISBN); 978-044318968-5 (ISBN) ; Saleem, I. M ; Sahar, A ; Raza, N ; Sameen, A ; Nayik, G. A ; Ramniwas, S ; Sharif University of Technology
Elsevier
2023
Abstract
Food science researchers are concerned about global food wastage due to decreased shelf life. It has been shown that using approaches based on nanotechnology, including metal-based nanoparticles (NPs), can alleviate the issues with decreased shelf life and environmental problems. Gold nanoparticles (AuNPs) and their synthesis have seen notable advancements in the last several decades. AuNPs are now utilised more often in industrial and medicinal settings. AuNPs are being employed in the nanopackaging industry as a recently adopted technique because of their medicinal and antibacterial properties and their inert and hypoallergenic nature. When employed in the food industry, AuNPs have...