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Development of AI-based Prediction and Assessment Program for Tunnelling Impact
유충식,SYED AIZAZ HAIDER2,양재원,TABISH ALI 한국지반신소재학회 2019 한국지반신소재학회 논문집 Vol.18 No.4
In this paper the development and implementation of an artificial intelligence (AI)-based Tunnelling Impact prediction and assessment program (SKKU-iTunnel) is presented. Program predicts tunnelling induced surface settlement and groundwater drawdown by utilizing well trained ANNs and uses these predicted values to perform the damage assessment likely to occur in nearby structures and pipelines/utilities for a given tunnel problem. Generalised artificial neural networks (ANNs) were trained, to predict the induced parameters, through databases generated by combining real field data and numerical analysis for cases that represented real field conditions. It is shown that program equipped with carefully trained ANN can predict tunnel impact assessments and perform damage assessments quiet efficiently and comparable accuracy to that of numerical analysis. This paper describes the idea and implementation details of the SKKU-iTunnel with an example for demonstration.
A New Inverse Kinematics Method for Three Dimensional Redundant Manipulators
Haider A. F. Mohamed,Samer Yahya,M. Moghavvemi,S. S. Yang 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper describes a new geometrical method to solve the inverse kinematic problem for hyper redundant manipulators. The proposed method finds one solution from these infinite solutions. By using this method, the angles between each adjacent links are the same, which makes controlling the movement of these links easier and makes a lining up of two or more joint axes not possible, i.e. very effective for avoiding singularities. A comparison between the proposed manipulator and the PUMA manipulator has been carried out. The manipulability index of both manipulators has been calculated to show the effectiveness of the proposed method. Experiments have been conducted on three links manipulator.
Haider Niaz,Jay Liu 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10
At current fossil fuels consumption rate, enormous challenges are associated, including global warming, environmental pollution, climate change, and, more importantly, scarcity of these resources shortly. To combat these challenges, renewable energy-based hydrogen production processes can provide substantial support in minimizing the ever-increasing global warming threat. Therefore, the implementation of renewable energy-based processes will significantly help mitigate CO₂ emissions. Among various production pathways, alkaline water electrolysis stands out due to its proven commercial importance. In this study, integrated design for 4.5 MW alkaline water electrolyzer (AWE) and battery energy storage system (BESS) is presented to overcome the dynamic and fluctuating nature of renewable energy and thus provide a continuous green hydrogen production system. Furthermore, a cost analysis is performed for systems with and without BESS to explore the real economic potential of the proposed models. Minimum hydrogen selling price (MHSP) for AWE with BESS presents the lowest selling price of 3.97$/kg, whereas the system without BESS reports MHSP as 4.96 $//kg.
Haider Mshali,Ahmed Al-Azawei 한국과학기술정보연구원 2022 Journal of Information Science Theory and Practice Vol.10 No.3
Online learning is becoming ubiquitous worldwide because of its accessibility anytime and from anywhere. However, it cannot be successfully implemented without understanding constructs that may affect its adoption. Unlike previous literature, this research extends the Unified Theory of Acceptance and Use of Technology with three well-known theories, namely compatibility, online self-efficacy, and knowledge sharing and acquisition to examine online learning adoption. A total of 264 higher education students took part in this research. Partial Least Squares-Structural Equation Modeling was used to evaluate the proposed theoretical model. The findings suggested that performance expectancy and compatibility were significant predictors of behavioral intention, whereas behavioral intention, facilitating conditions, and compatibility had a significant and direct effect on online learning’s actual use. The results also showed that knowledge acquisition, knowledge sharing, and online self-efficacy were determinates of performance expectancy. Finally, online self-efficacy was a predictor of effort expectancy. The proposed model achieved a high fit and explained 47.7%, 75.1%, 76.1%, and 71.8% of the variance of effort expectancy, performance expectancy, behavioral intention, and online learning actual use, respectively. This study has many theoretical and practical implications that have been discussed for further research.
Haider, Zeeshan,Zheng, Jin You,Kang, Young Soo The Royal Society of Chemistry 2016 Physical chemistry chemical physics Vol.18 No.29
<P>Unique octagonal shaped BiOCl nanosheets (NS) dominantly exposed with high energy {001} crystal facets have been fabricated via a simple hydrothermal route without using organic surfactants. The dynamics of photogenerated charge carriers have been studied by time-resolved photoluminescence spectroscopy. The fitting parameters of the decay kinetics were used to calculate both the intensity weighted average lifetime (<tau >(int.)), as well as the amplitude weighted average lifetime (<tau >(amp.)) of the photogenerated charge carriers. The <tau >(int.) and <tau >(amp.) values for {001} BiOCl NS, i.e., 17.23 ns and 1.94 ns, respectively, were observed to be significantly higher than the corresponding values obtained for pristine BiOCl such as 2.52 ns and 1.07 ns, respectively. Significant quenching of the PL emission intensity of {001} BiOCl NS reflected the enhanced separation of the photogenerated charge carriers. Reduced thickness and in situ iodine doping was favorable to minimize the recombination tendency. The photocatalytic activity was monitored via the photodegradation of RhB under visible light illumination (lambda > 400 nm). {001} BiOCl NS exhibited superior performance when compared to pristine BiOCl in terms of the rapid degradation kinetics and higher photonic efficiency. The photocatalytic efficiency of {001} BiOCl NS was 2.8 times higher than pristine BiOCl. Iodine doping induced extended the optical absorption in the visible region and improved the separation of the photogenerated charge carriers, which played an important role to enhance the photocatalytic activity. The photodegradation mechanism was systematically studied using various radical quenchers and it was revealed that photogenerated holes (h(+)) and superoxide radicals (O-center dot(2-)) actively participated whereas hydroxyl (OH center dot) radicals had a negligible contribution in the photodegradation of RhB. {001} BiOCl NS has shown a higher photocurrent density and lower charge transfer resistance analyzed through photoelectrochemical and electrochemical impedance measurements. This study highlights the fabrication of unique octagonal BiOCl NS with improved separation of charge carriers across high energy crystal facts to design a highly efficient photocatalyst.</P>
Haider, M.N.,Faridullah, M.,Kamal, M.,Islam, M.N.,Khan, M.N.A. The Korean Society for Marine Biotechnology 2007 한국해양바이오학회지 Vol.2 No.1
Golda farms and depots of selected areas of the different districts of Bangladesh viz. Khulna, Bagerhat, Jessore and Norial area were sampled for the detection of Salmonella sp. and Escherichia coli. Incidence of Salmonella positive samples was 39%, 25%, 50% and 42% in the farms and 30%, 20%, 20% and 30% in the depots of Dumuria under Khulna, Bagerhat Sadar under Bagerhat, Avoynagar under Jessore and Kalia under Norail district respectively. On the other hand, E. coli positive samples was 23%, 42%, 25% and 17% in the farms and 70%, 30%, 50% and 30% in the depots of Dumuria (Khulna), Bagerhat Sadar (Bagerhat), Avoynagar (Jessore) and Kalia (Norail) region respectively. The overall results indicate that the trend of Samonella and E. coli contamination in farms and depots of all the regions is more or less similar although some variations were observed among the farms and depots of different location and region.
Haider, Adawiya J.,Mousa, Ali M.,Al-Jawad, Selma M.H. The Institute of Electronics and Information Engin 2008 Journal of semiconductor technology and science Vol.8 No.4
In this work CdS films were prepared by using chemical bath deposition, which is simple and inexpensive technique suitable for large deposition area. Annealing in air at different temperatures (300, 350, 400, 450 and $500^{\circ}C$) at constant time of 30 min, also for different times (15, 30, 45, 60 and 90 min) at constant temperature ($300^{\circ}C$) is achieved. X-Ray analysis has confirmed the formation of cadmium oxide (CdO) with slight increase in grain size, shift towards lower scattering angle due to relaxation in the tensile strain for deposition films, and structure change from cubic and hexagonal to the hexagonal. From electrical properties, significant increase in electrical conductivity appeared in samples annealed at $300^{\circ}C$ for 60 min, and at $350^{\circ}C$ for 30 min.