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Junaid Ikram(주나이드),Qudsia Junaid(쿳시야),Kyu-yun Hwang(황규윤),Byung-Il Kwon(권병일) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
In the design and analysis of electric machines the precise calculation of iron loss has incredible significance. It is tough to foresee iron losses precisely in machines due to distribution of non sinusoidal flux density. It is necessary to approximate the iron losses for the precise computation of efficiency. This paper presents a novel approach for the prediction of iron losses of the brushless dc (BLDC) motors by considering the effects of minor hysteresis loops in the simplified model. The novel iron loss model results are compared with the simplified model and with finite element method (FEM).
Junaid Ikram,Nasrullah Khan,Qudsia Junaid,Salman Khaliq,Byung-il Kwon 한국자기학회 2017 Journal of Magnetics Vol.22 No.2
This paper presents a 2-D analytical method to calculate the back EMF of the axial flux permanent magnet synchronous generator (AFPMSG) with coreless stator and dual rotor having magnets mounted on both sides of rotor yoke. Furthermore, in order to reduce the no load voltage total harmonics distortion (VTHD), the initial model of the coreless AFPMSG is optimized by using a developed analytical method. Optimization using the 2-D analytical method reduces the optimization time to less than a minute. The back EMF obtained by using the 2-D analytical method is verified by a time stepped 3-D finite element analysis (FEA) for both the initial and optimized model. Finally, the VTHD, output torque and torque ripples of both the initial and optimized models are compared with 3D-FEA. The result shows that the optimized model reduces the VTHD and torque ripples as compared to the initial model. Furthermore, the result also shows that output torque increases as the result of the optimization.
Azeezat Adenike Junaid,Mohd Salleh Kamarudin,Wahab Puteri Edaroyati,Quazim Olawale Junaid,Victor Tosin Okomoda,Mohammed Sani Isyaka,Yusuf Adewale Adejola,Danladi Mohammed Umar,Sarker Mohd Nurul Amin 한국수산과학회 2023 Fisheries and Aquatic Sciences Vol.26 No.8
The effects of prolonged photoperiod (additional night lighting) were investigated on the production of Ocimum basilicum (lemon basil) and fish/crayfish raised in a nutrient film technique aquaponic system. Hybrid lemon fin barb and red claw crayfish juveniles were co-cultured with O. basilicum and subjected to 12 h of ambient natural daylight and additional 0, 4, 8, and 12 h of night lighting for 14 weeks (two batches of 7 weeks each). The water quality parameters and the performance characteristics of the fish/crayfish/plant were evaluated, and the nutrient uptake (nitrogen, phosphorus, and potassium) in the system by the three organisms was also measured. The fish growth performance showed no significant differences (p > 0.05) in all the growth parameters measured across the treatments. The body proximate and nitrogen, phosphate, and potassium (NPK) composition of the fish and crayfish were not significantly (p > 0.05) different across the treatments. Similarly, there was no significant difference (p > 0.05) in the NPK uptake by the fish and crayfish across the treatments. The plant growth performance showed that there were no significant (p > 0.05) differences in the plant growth parameters measured, except for % plant height gained in the 12 h-light treatment (403.2 ± 26.0%) which was significantly (p < 0.05) higher than other treatments and cycles. Hence, this study demonstrated that varying supplementary night lighting has no significant effect on the growth performance of O. basilicum, hybrid lemon fin barb, and red claw crayfish. This study, therefore, suggests that supplementary night lighting should not be considered for O. basilicum production as it does not significantly improve the performance characteristics of the plant nor the fish co-cultured with it in a polyculture aquaponic system.
쿳시야 주나이드(Qudsia Junaid),주나이드 이크람(Junaid Ikram),유용민(Yong Min You),황규윤(Kyu-Yun Hwang),권병일(Byung Il Kwon) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.4
This paper presents an optimization of the double sided axial flux penn anent magnet synchronous generator (AFPMSG) with coreless stator. A 2-D analytical model is used for the optimization of the double sided AFPMSG having concentrated winding. The micro genetic glgorithm (MGA) is employed for the minimization of voltage total harmonic distortion (VTHD) while maintaining the no load voltage constant. The results of the optimized model are compared with the initial model. The results show the reduction in the value of the VTHD.
Smart algorithms for patient assignment in disasters
Junaid Ahmed Zubairi,Sahar Idwan 한국통신학회 2018 ICT Express Vol.4 No.2
We describe the design and implementation of a system to automate patient handling and assignment to hospitals in mass disasters involving a large number of injured victims over a wireless network. In addition, the previously developed MEDTOC system is modified and enhanced to include location-aware features at the disaster site, as well as quick classification and assignment of patients to nearby hospitals. We present the designed implementation and the results from a simulated disaster involving a fictitious 20-story apartment building located in Ras Al Khaimah, United Arab Emirates. It is expected that chaotic mass-disaster situations can be more suitably controlled and stabilized by using the techniques from this project, thus saving more lives.
Nvidia Jetson Xavier ARG를 사용하여 ROS로 로봇 제어
( Junaid Khan Kakar ),( Sang-cheol Kim ) 한국농업기계학회 2022 한국농업기계학회 학술발표논문집 Vol.27 No.2
In a world where artificial intelligence in robotics is so consolidated in many fields and in different applications, there is a need to understand how it works and how we can improve these algorithms in order to optimize them. The primary challenges that are encountered by deploying the robot by using ROS platform in mapping and navigation to create a dynamic environment. The Robot Operating System (ROS) is a flexible framework for writing robot software where a collection of tools, libraries, and conventions that aim to simplify the task of creating complex and robust robot behavior across a wide variety of robotic platforms. Simultaneous localization and mapping (SLAM) provide a good understanding of the environment for navigation and path planning. In this work, we explore the problem of mapping and navigation by incorporating the semantics of the environment. For the experimental setup, a robot (Scout-WeGo) is designed having equipped with system, RealsenseRGB-D435i camera, SBG navigation inertial sensor and NVidia Jetson Xavier as computation computer. The fundamental task for the robot is to map the unknown environment and successfully navigate through it by avoiding the obstacles. SLAM is a well-known algorithm, which entails the construction or updating of the map of an unexplored environment while simultaneously keeping track of an agent's location within the dynamic environment.
Design and implementation of autonomous wireless charging station for rotary-wing UAVs
Junaid, A.B.,Lee, Y.,Kim, Y. Gauthier-Villars ; Elsevier Science Ltd 2016 AEROSPACE SCIENCE AND TECHNOLOGY Vol.54 No.-
Rotary-wing UAVs such as multicopters have the ability to operate in confined spaces, to perform high maneuverable motions, and to hover at a given point in space and perch or land on a flat surface. This makes a multicopter a very attractive aerial platform giving rise to a myriad of research opportunities. Yet, these opportunities are often severely limited by the constraints on the multicopter's flight time due to its limited battery capacity. This in turn results in the limits on the payload of the multicopter. Fortunately, by introducing a team of autonomous multiple multicopters running an automatic and wireless battery recharging process without any human intervention, the overall mission time can be greatly increased and subsequently relax the constraints on the flight time and the payload. As a first step towards this idea, a cheap charging solution using wireless power transfer (WPT) is proposed for a single multicopter in this paper. It turns out that the proposed solution achieves a power transfer efficiency of greater than 50% on average (reasonable compared to the existing similar solutions). Also for a demonstration of the proposed recharging solution, an interface between an open-source flight controller and a ground PC is also uniquely designed and implemented to successfully allow for autonomous position control and navigation in an environment equipped with precise vision sensors (VICON cameras).