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Oxygen nanobubbles for the delivery of mycophenolic acid to modulate a immunosuppression
( Muhammad Saad Khan ),황장선,우현정,최종훈 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Immunosuppressive drugs are crucial for preventing acute graft rejection or autoimmune diseases. They are generally small molecules that require suitable drug carriers for ensuring stability, bioavailability, and longer half-life. Mycophenolic acid (MPA) is an extensively studied immunosuppressive drug. However, it requires suitable carriers for overcoming clinical limitations. Currently, lipid-shelled micro- and nanobubbles are being thoroughly investigated for diagnostic and therapeutic applications, as they possess essential properties, such as injectability, smaller size, gaseous core, high surface area, higher drug payload, and enhanced cellular penetration. Phospholipids are biocompatible and biodegradable molecules, and can be functionalized according to specific requirements. This method can be potentially used for implantation and for treating autoimmune diseases, wherein immunosuppression is desired.
Engineering oxygen nanobubbles for the effective reversal of hypoxia
Khan, Muhammad Saad,Hwang, Jangsun,Seo, Youngmin,Shin, Kyusoon,Lee, Kyungwoo,Park, Chanhwi,Choi, Yonghyun,Hong, Jong Wook,Choi, Jonghoon Informa UK (TaylorFrancis) 2018 Artificial cells, nanomedicine, and biotechnology Vol.46 No.suppl3
Detection and Recognition of Vehicle License Plates using Deep Learning in Video Surveillance
Farooq, Muhammad Umer,Ahmed, Saad,Latif, Mustafa,Jawaid, Danish,Khan, Muhammad Zofeen,Khan, Yahya International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.11
The number of vehicles has increased exponentially over the past 20 years due to technological advancements. It is becoming almost impossible to manually control and manage the traffic in a city like Karachi. Without license plate recognition, traffic management is impossible. The Framework for License Plate Detection & Recognition to overcome these issues is proposed. License Plate Detection & Recognition is primarily performed in two steps. The first step is to accurately detect the license plate in the given image, and the second step is to successfully read and recognize each character of that license plate. Some of the most common algorithms used in the past are based on colour, texture, edge-detection and template matching. Nowadays, many researchers are proposing methods based on deep learning. This research proposes a framework for License Plate Detection & Recognition using a custom YOLOv5 Object Detector, image segmentation techniques, and Tesseract's optical character recognition OCR. The accuracy of this framework is 0.89.
Dynamics Analysis and Control of 5 DOF Robot Manipulator
Muhammad Salman,Hamza Khan,Saad Jamshed Abbasi,Min Cheol Lee 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10
The accurate dynamic model of the robot manipulator is essential for better control performance. Dynamic modelling refers to deriving such equations that explicitly describe the relationship between force and motion in a system. There are several methods to solve for the dynamics of the system. The main concern while doing dynamics is to check its reliability and verification. In this paper, Lagrange Euler (L-E) method is used to dynamically model a five-degrees-of-freedom (DOF) robot manipulator and verified through 3D model of robot in Simulink, simscape multibody toolbox. Followed by the implementation of a proportional-integral-derivative (PID) control with a low pass filter ‘N’ (PIDN) on the derived system. The low pass filter enhances the control performance by eliminating the effect of derivative term’s fluctuations (noise). Furthermore, Ziegler Nichols"s closed-loop tuning method is used to optimally tune the PID control. The derived model and control algorithm simulations have been performed in MATLAB. The simulations results illustrated that the derived model is controllable which indicates the correctness of the derived model.
Saad Ullah Khan,Khawaja Khalid Mehmood,Soon-Jeong Lee,Zunaib Maqsood Haider,Muhammad Kashif Rafique,Chul-Hwan Kim 한국조명·전기설비학회 2017 조명·전기설비학회논문지 Vol.31 No.9
Secure and continuous electric vehicle (EV) charging operation is a key concern for the safety of EVs and their reliable integration with the power grid. During a lightning incident on the distribution network, the security of integrated EVs is threatened. Lightning overvoltages can be damaging for the EVs, resulting in huge repair costs. Thus, it is necessary that the feeder is provided with lightning protection for the safe integration of EVs. This paper has analyzed direct lightning overvoltages on IEEE 13-node distribution feeder with and without surge arrester protection. The system overvoltages are evaluated on primary distribution nodes, which are the prospective locations for EV connection. Results show the importance of lightning protection of the feeder for EV integration.
An Improved Algorithm for AC Impedance Extraction
Muhammad Saad,Yongfeng Ju,Shahbaz Khan,Husan Ali,Abdul Wadood,Sang Bong Rhee 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.6
The overall system stability of interconnected electrical and electronic systems is associated with the input and output impedances of each individual system, therefore, accurate AC impedance measurement for a linear and nonlinear systems are imperative. These impedances are normally measured using small-signal frequency injection techniques. However, the harmonic transfers from the output side to the input side and vice versa deteriorates the measured results, making them ambiguous. These harmonic transfers cause the problems of frequency aliasing as well as spectral leakages leading to inaccurate measurements of results. In order to achieve the precise and accurate results, there is a need to adopt such an impedance measuring technique which is the best among the available techniques. A new algorithm is proposed to modify the range of frequencies of interest and inject such small-signal frequencies which do not interfere with the system harmonics. The measurement of the AC impedance of the three-phase RL circuit utilizing three diff erent small-signal injection techniques is performed. From the results displayed, it is clear that all the techniques perform well, therefore, the most simple, single phase line-current injection was selected for the AC impedance measurement of the nonlinear switching circuit such as sixpulse rectifi er. The issues discussed above are more serious in nonlinear switching circuit because of the presence of higher order switching harmonics in the circuit. The proposed algorithm is applied to measure the output-impedance of the threephase AC power supply as well as the AC input-impedance of the six-pulse rectifi er. These results of the switch vs average model and that of average model vs. experimental prototype are displayed for comparison, and it is clear that the proposed algorithm off ers much-improved results.
Design of an Assistance Robot for Patients Suffering from Paraplegia
Shakir Khan,Muhammad Fahad Zeb,Nouman Ghafoor,Saad Jamshed,Muhammad Raheel Afzal,Amre Eizad 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
The people with disabled lower limbs find it difficult to lead an independent life and the lack of upper body exercise may lead to disuse ailment. Various studies have shown that both children and adults benefit substantially from access to a means of independent mobility. Independent mobility is a dream for every person with some or the other physical disability especially in the case of paraplegics. In the research presented in this paper, an assistance platform was developed to help the paraplegic and elderly people by providing the ability to stand-up and move about. Virtual prototype technology was used to make the design and development of the robot more efficient using Solid-works™. The device developed may be used for rehabilitation of people recovering from extended periods of limb disuse and for paraplegic patients. Although some commercialized training machines and some developed lower-limb rehabilitation robots can perform adequate motion functions during lower limb training programs but the weight, size and cost of these devices limits their possibilities of use. In contrast, the proposed design has the potential to be used among the middle socio-economic class as a product in daily household works of the paraplegic patients.
Hamza Khan,Saad Jamshed Abbasi,Muhammad Salman,Min Cheol Lee 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11
In this research, a virtual simulator (slave system) of an eight-degrees-of-freedom robot (two-DOF crane, one-DOF prismatic (telescopic mast), and five-DOF robot manipulator) is developed and teleoperated by an external hardware haptic device (master system) for nuclear power plants (NPP) reactor vessel internals (RVI) dismantling operations. For operations such as cutting, the robot end-effector with a laser cutter should maintain a constant distance from the physical wall of RVI. So, a virtual wall near the physical wall is assumed. The end-effector should remain on the virtual wall for optimal cutting which is achieved through force tracking impedance control. In this paper, initially sliding mode control (SMC) was implemented but resulted in chattering in force tracking response. Therefore, super twisting sliding mode control (STSMC)-based force tracking impedance control is designed and implemented for enhanced end-effector force tracking. The control input of the STSMC is composed of a continuous and discrete component. Continuous control input regulates control performance against uncertainties, whereas discrete provides a switching algorithm. STSMC then eliminates the chattering effect and reduces the force tracking error. The performance of SMC-based and STSMC-based impedance control is compared, and the comparison shows that the STSMC-based impedance control provides enhanced performance.
An Automated Object Retrieval System for Warehouses
Amna Khan,Abdul Rehman Sair,Anas Ekram,Saad Malik,Muhammad Raheel Afzal,Ali Bin Junaid,Amre Eizad 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
The transport of objects in a warehouse is an indispensible but time consuming task, and is therefore the focus of extensive research. This paper presents a system that autonomously retrieves boxes placed in shelves according to the part number fed in the system by the user. The system utilizes a modified implementation of the A<SUP>*</SUP> algorithm to determine the shortest path for retrieving the objects. A maximum of three objects can be retrieved in one round by the robot. After retrieval, the objects are delivered to a delivery station. Line tracking sensors are used for robot navigation. Telescoping arms mounted on the robot are used to retrieve objects from the shelves. The guidance algorithm and Graphic User Interface (GUI) have been implemented using MATLAB® and the robot has been designed using SolidWorks®.
Use of Nanoscale Materials for the Effective Prevention and Extermination of Bacterial Biofilms
이도현,서영민,Muhammad Saad Khan,황장선,조연호,손재우,이경우,박찬휘,Sachin Chavan,Assaf A. Gilad,최종훈 한국생물공학회 2018 Biotechnology and Bioprocess Engineering Vol.23 No.1
Biofilms have been shown to cause most human infections. The prevention and extermination of bacterial biofilms has always presented a major challenge in the clinic. The failure of traditional antibiotics and the development of bacterial resistance against these measures is on the rise. Nanoscale materials possess the advantage of presenting enhanced surface properties of bulk materials, and are emerging as effective agents for deterring microbial growth. This review article summarizes the fundamentals of bacterial growth, biofilm formation, mechanisms for antibacterial technologies, and usage of nanoparticles for the prevention and extermination of biofilms. Further research is required with respect to the appropriate usage of nanoparticles for the effective control of biofilms to save human lives and reduce healthcare costs.