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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.
M. Jibran Sheikh,Mah-a-Mobeen Ahmed,Qudsia Arshad,Wajid Shakeel 한국유통과학회 2015 The Journal of Asian Finance, Economics and Busine Vol.2 No.1
In this paper our main focus is to provide insight into the history of M&A’s for this purpose we have analysed the different waves of M&A. We have analysed these waves in context of available literature and fact and figures. During the study we realised that almost all of the waves of M&A’s ended because of financial crises, although impact and severity of that crises may differ. We analysed the impact of current crises on M&A in global context and in order to establish how companies have and in post crises era i.e. after crises of 2007 onwards how the companies have changed their corporate strategies to accommodate M&A’s. We have also analysed which factors fuelled M&A’s in past and were these factors present in post crises era M&A activities. By first quarter of 2011 the many firms saw new growth opportunities in M&A activities seemed to rebound as large companies used M&A’s as part of their corporate strategy but this was cut short by events like US debt ceiling, down grade of USA’s credit ratings along with fears about Eurozone’s financial health and their impact on future prospects of M&A’s would they continue to prosper or would they be weighed down by these events.
M. Shamim Jairajpuri,Qudsia Tahseen,Park, Young-Eoun Korean Society of Applied Entomology 2000 Journal of Asia-Pacific Entomology Vol.3 No.1
Iotonchus onchus n. sp. is characterised by 2.4-2.5 mm long body; buccal cavity with posteriorly placed dorsal tooth at 72-77% of its length, dorsally swollen oesophageal collar, tuberculate cardia, presence of pre- and post-vulval papillae, muscular vagina without sclerotization and males with 11 pre-cloacal ventromedian supplement and 2 post-cloacal ventral papillae. Another species, I. litoralis reported here for the first time from Korea is also described in detail with variations in its buccal cavity length, tooth position and 'a' value.
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.