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Zeeshan,Selvam Sathish Panneer,Park Jaehwan,Park Sungho,Kim Hee-Eun,Cho Sungbo 한국바이오칩학회 2024 BioChip Journal Vol.18 No.2
The COVID-19 pandemic has led to a substantial increase in the advancement of point-of-care (POC) diagnostic tools due to their potential utility in detecting and managing the spread of the disease. Currently, many diagnostic techniques neces- sitate advanced laboratory equipment and specialized expertise to deliver dependable, cost-eff ective, specifi c, and sensitive POC tests for COVID-19 diagnosis. Herein, we report a highly sensitive electrochemical sensor array that features S-RBD protein, covalently anchored on the surface-engineered Pt-black-coated microdisk gold electrodes to monitor severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Computer simulations were performed using diff erent electrode gaps to optimize and fabricate the gold microdisk electrode array. The high sensitivity was ensured by decreasing the electrode gap as well as by depositing Pt-black nanoparticles on the microdisk gold electrodes, by means of chronopotentiometry. The electrical readout depends on monitoring changes in the cyclic voltammograms at the electrode/electrolyte interface as a result of the competitive interaction between monoclonal COVID-19 antibodies and varying antigen concentrations. Overall, the developed electrochemical sensor array exhibits promising electroanalytical capabilities by displaying an excellent linear response ranging from 100 to 1 μg/ml with a detection limit of ~ (0.23 ng/ml). In addition, as a proof-of-concept applica- tion, the developed electrochemical sensor array was employed as a sensing platform for the detection of heat-inactivated SARS-CoV-2. Such accomplishments highlight the advantages of low-cost localized electronic devices with high sensitivity and rapid multiple samples detection capabilities to play a crucial role in controlling the spread of infectious diseases like COVID-19.
Zeeshan Rashid,Cecilia Devi Wilfred,Regupathi Iyyaswami,Arunagiri Appusamy,Murugesan Thanabalan 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-
Dispersion of asphaltene in crude oil using ionic liquids (ILs) is being considered as a viable solution, inextraction and transportation processes. In this work, the interplay between asphaltene and ILs has beenstudied systematically to understand the effect of structural variation of ILs on asphaltene solubility. Theactivity coefficient of the total of 1517 ILs with different combinations of cation and anion of ILs forrepresentative asphaltene molecule (asphaltene) was estimated via COSMO-RS (Conductor-likeScreening Model for Real Solvents). COSMO_RS predictions were validated using experimental dataon asphaltene solubility. Among the studied ILs, asphaltene showed high solubility in imidazolium-basedILs with hydrophobic anions. The present approach paved a way forward to rationally understand theimpact of structural variation of ILs on their interaction with asphaltene molecule and to design new ILsfor the dispersion and stabilization of asphaltene.
Performance Analysis of Path Planning Algorithms for Fruit Harvesting Robot
Zeeshan Sadaf,Aized Tauseef 한국농업기계학회 2023 바이오시스템공학 Vol.48 No.2
Purpose Path planning is an essential part in designing of an agricultural robot. The path planning algorithms for fruit harvesting robots vary in performance, based on diff erent environments, obstacles, and constraints. This research aims to analyze and evaluate the most commonly used path planning algorithms by fruit harvesting robots in the past 10 years to assess the robot’s performance. The primary objective behind the comparative analysis of path planning algorithms is to ascertain which algorithm demonstrates better performance in terms of reaching the target fruit in the shortest time, requiring the least amount of computing resources, and being able to navigate around obstacles eff ectively. Hence, the study determines which path planning algorithm is the most effi cient for the application of fruit harvesting robot. Method In this study, four common path planning algorithms were evaluated namely A-star, Probabilistic Road Map, Rapidly exploring Random Tree, and improved Rapidly exploring Random Tree. Three cases were examined for performance. The fi rst case deals with performance based on varying orientations of fruit within the workspace. The second case investigates the performance in the presence of obstacles in the path, and the third case caters to performance due to varying distances of robot and the fruit. Matlab software was used for creating simulation environment for testing. Run time, path length, standard deviation, and total task time were obtained for each case and statistical analysis was done. Results It was found that improved Rapidly exploring Random Tree performed better in terms of path length and gave an optimal path as compared to the other algorithms due to its rewiring feature by an average of 21%. Run time of Rapidly exploring Random Tree was better than the other three algorithms. Conclusion Four most commonly used path planning algorithm were analyzed for performance for fruit harvesting robot for three diff erent cases. Despite the variations in performance across diff erent scenarios, the results confi rmed that the improved Rapidly exploring Random Tree algorithm outperformed all other algorithms under the given constraints.
Coupling mechanism of a loop‐type ground radiation antenna
Zeeshan Zahid,김형동 한국전자통신연구원 2019 ETRI Journal Vol.41 No.4
The coupling mechanism of a loop‐type ground radiation antenna is investigated in this paper. We use the equivalent circuit model of the antenna and a full‐wave simulation to explain the coupling mechanism of the antenna. We analyze the effects of various antenna parameters on the coupling between the antenna element and the ground plane to examine the conditions for enhancing the coupling. Based on simulations with the equivalent circuit model, full‐wave simulations, and measurements, we propose optimal design considerations for the antenna. The findings of this study will aid the design and understanding of loop‐type ground radiation antennas for mobile devices.