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8. Summary and Conclusions

Author

Khalaf, Khaled, Vidojkovic, Vojkan, Long, John R., Wambacq, Piet, Celebi, Emre, Series Editor, Chen, Jingdong, Series Editor, Gopi, E. S., Series Editor, Neustein, Amy, Series Editor, Poor, H. Vincent, Series Editor, Khalaf, Khaled, Vidojkovic, Vojkan, Long, John R., and Wambacq, Piet

Published
2019
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10. Digitally-Modulated Polar Transmitters in 40 nm CMOS

Author

Khalaf, Khaled, Vidojkovic, Vojkan, Long, John R., Wambacq, Piet, Celebi, Emre, Series Editor, Chen, Jingdong, Series Editor, Gopi, E. S., Series Editor, Neustein, Amy, Series Editor, Poor, H. Vincent, Series Editor, Khalaf, Khaled, Vidojkovic, Vojkan, Long, John R., and Wambacq, Piet

Published
2019
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12. Introduction

Author

Khalaf, Khaled, Vidojkovic, Vojkan, Long, John R., Wambacq, Piet, Celebi, Emre, Series Editor, Chen, Jingdong, Series Editor, Gopi, E. S., Series Editor, Neustein, Amy, Series Editor, Poor, H. Vincent, Series Editor, Khalaf, Khaled, Vidojkovic, Vojkan, Long, John R., and Wambacq, Piet

Published
2019
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14. A 23-GHz TX/LNA Front-End Module for Inter-Satellite Links With 27.8% Peak Efficiency in the TX Path and 3.1-dB NF in the RX Path

Author

Ding, Kaijie, Vidojkovic, Vojkan, Milosevic, Dusan, Khalaf, Khaled, van Dommele, Rainier, Bentum, Mark, and Baltus, Peter

Abstract

This article presents a 23-GHz transmitter/low-noise amplifier (TX/LNA) front-end module (FEM) in 130-nm SiGe BiCMOS for inter-satellite links (ISLs) in the system of orbiting low-frequency antenna array (OLFAR). The FEM consists of an LNA, a power amplifier (PA), a variable-gain amplifier (VGA), a phase shifter (PS), and a TX/receiver switch (T/R SW). By applying the combination of different techniques: 1) multi-function block design strategy; 2) current reuse and ${\mathrm { g}}_{\mathrm { m}}$ boosting implemented by a triple-coil transformer in the LNA; 3) dual-LC-tank-based integrated T/R SW, a compact FEM is achieved, simultaneously with an advanced-state-of-the-art efficiency in the TX path and a competitive noise figure (NF) in the receiver (RX) path. In the TX path, it demonstrates a measured saturated output power ( $\mathrm {P}_{\mathrm {sat}}$ ) of 16.8 dBm, a peak TX efficiency of 27.8%, and a 34.1-dB gain. It supports 900-Mbps 64-QAM signals with 4.9% error vector magnitude (EVM) and −27.5-dBc adjacent channel power ratio (ACPR), at 9.0-dBm output power ( $\mathrm {P}_{\mathrm {out}}$ ) with 8.8% TX efficiency. In the RX path, an NF of 3.1 dB and an input 1-dB compression point (IP $_{\mathrm {1~dB}}$ ) of −19.4 dBm are achieved with a 19.3-dB gain and a 10-mW power consumption. The core chip area is $1.11\times 0.48$ mm.

Published
2024
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15. The Relationship between Stress and Preclinical Dental Students' Performance: A Longitudinal Study.

Author

Lugassy, Diva, Ben-Izhack, Gil, Zissu, Sara, Shitrit Lahav, Rotem, Rosner, Ophir, Uziel, Nir, Naishlos, Sarit, Shely, Asaf, and Khalaf, Khaled

Subjects
DENTAL students, PERFORMANCE anxiety, MOTOR ability, INVERSE relationships (Mathematics), SCHOOL year
Abstract

Background. The aim of this study was to evaluate the changing levels of stress among dental students during 8 months of a basic manual skills course in the preclinical year and to examine the association between stress and dental performance. Methods. A longitudinal study was conducted in the 2023 academic year in a total of 58 (male = 17 and female = 41; mean age = 26.43, range 22–33) undergraduate dental students at Tel Aviv University of dentistry during their fourth year of study. Depression Anxiety Stress Scale (DASS‐21) and Dental Environment Stress (DES) questionnaires were used to assess the psychological well‐being and the severity of DASS symptoms experienced by the students. The students' dental performances were assessed using two manual tests on plastic teeth. The questionnaires and the manual tests were used at three periods of time, T0, T1, and T2. Wilcoxon signed‐rank tests were performed to compare the DASS scores and DES stressors of dental students between T0, T1, and T2. Kendall's nonparametric correlations were calculated to investigate the relationships of DES stressors and depression, anxiety, and stress scores with manual performance. Conclusions. The perception of high stress by dental students is due to the stressful education process of the preclinical year. There is an inverse correlation between the lower level of anxiety and the increase level of dental performance with 74% of the variance in dental performance explained by the anxiety score. Work‐related stressors such as manual skills might reduce dental performance in contrast to non‐work‐related factors such as financial obligations, personal issues, and family factors, which might increase student dental performance. [ABSTRACT FROM AUTHOR]

Published
2024
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18. Introduction

Author

Khalaf, Khaled, Vidojkovic, Vojkan, Wambacq, Piet, Long, John R., Khalaf, Khaled, Vidojkovic, Vojkan, Wambacq, Piet, and Long, John R.

Published
2015
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19. Background

Author

Khalaf, Khaled, Vidojkovic, Vojkan, Wambacq, Piet, Long, John R., Khalaf, Khaled, Vidojkovic, Vojkan, Wambacq, Piet, and Long, John R.

Published
2015
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20. Top-Level Design

Author

Khalaf, Khaled, Vidojkovic, Vojkan, Wambacq, Piet, Long, John R., Khalaf, Khaled, Vidojkovic, Vojkan, Wambacq, Piet, and Long, John R.

Published
2015
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24. Introduction

Author

Khalaf, Khaled, primary, Vidojkovic, Vojkan, additional, Long, John R., additional, and Wambacq, Piet, additional

Published
2019
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30. Conclusions

Author

Khalaf, Khaled, Vidojkovic, Vojkan, Wambacq, Piet, Long, John R., Khalaf, Khaled, Vidojkovic, Vojkan, Wambacq, Piet, and Long, John R.

Published
2015
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33. "Effective Strategies for Teaching Online: Lessons Learned from the COVID-19 Pandemic".

Author

ABDAL HAMID, KHALAF KHALED

Subjects
ONLINE education, COVID-19 pandemic, EFFECTIVE teaching, UNIVERSITIES & colleges, THEMATIC analysis, TEACHERS
Abstract

Copyright of Journal of Tikrit University for Humanities is the property of Republic of Iraq Ministry of Higher Education & Scientific Research (MOHESR) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2023
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