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- 저자 : Mohsin Saleem (검색결과 15 건)
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Social Support in the Times of Social Distancing: Learnings from the South Asian Context
Mohsin BASHIR,Ammara SALEEM,Qamar ALI 한국유통과학회 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.3
This study will examine the relationship between social support from the work and family domains, referred to as multiple social network ties (MSNT), and employees’ job and family-related performance outcomes during the COVID-19 crisis. The study also demonstrates the importance of employees’ work-family balance (WFB) in moderating the association between MSNT and job and family-related performance. A two-wave design was used to collect data from 320 managerial level personnel in Pakistan’s textile sector. The path analysis technique of structural equation modelling (SEM) was used to analyze the responses. In times of crisis, social support mechanisms could potentially replace organizational support mechanisms for employees dealing with work and family obligations, according to the study. The findings of this study show that work-family balance is a significant partial mediator between MSNT and employees’ job and familyrelated outcomes during the COVID-19 pandemic, according to a best-fit model. This research supports the pragmatic view of MSNT’s action mechanism in generating jobs for employees and family-related results, especially in uncertain situations. According to the findings, employees who have a positive work-life balance are happier and more productive in both work and personal life. It has major implications for human resource management (HRM) research and practice.
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Saleem, Omer,Rizwan, Mohsin,Khizar, Ahmad,Ahmad, Muaaz The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.4
This paper presents a robust-optimal control strategy to improve the output-voltage error-tracking and control capability of a DC-DC boost converter. The proposed strategy employs an optimized Fractional-order Proportional-Integral (FoPI) controller that serves to eliminate oscillations, overshoots, undershoots and steady-state fluctuations. In order to significantly improve the error convergence-rate during a transient response, the FoPI controller is augmented with a pre-stage nonlinear error-modulator. The modulator combines the variations in the error and error-derivative via the signed-distance method. Then it feeds the aggregated-signal to a smooth sigmoidal control surface constituting an optimized hyperbolic secant function. The error-derivative is evaluated by measuring the output-capacitor current in order to compensate the hysteresis effect rendered by the parasitic impedances. The resulting modulated-signal is fed to the FoPI controller. The fixed controller parameters are meta-heuristically selected via a Particle-Swarm-Optimization (PSO) algorithm. The proposed control scheme exhibits rapid transits with improved damping in its response which aids in efficiently rejecting external disturbances such as load-transients and input-fluctuations. The superior robustness and time-optimality of the proposed control strategy is validated via experimental results.
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Omer Saleem,Mohsin Rizwan,Ahmad Khizar,Muaaz Ahmad 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.4
This paper presents a robust-optimal control strategy to improve the output-voltage error-tracking and control capability of aDC-DC boost converter. The proposed strategy employs an optimized Fractional-order Proportional-Integral (FoPI) controllerthat serves to eliminate oscillations, overshoots, undershoots and steady-state fluctuations. In order to significantly improve theerror convergence-rate during a transient response, the FoPI controller is augmented with a pre-stage nonlinear error-modulator. The modulator combines the variations in the error and error-derivative via the signed-distance method. Then it feeds theaggregated-signal to a smooth sigmoidal control surface constituting an optimized hyperbolic secant function. The error-derivative isevaluated by measuring the output-capacitor current in order to compensate the hysteresis effect rendered by the parasiticimpedances. The resulting modulated-signal is fed to the FoPI controller. The fixed controller parameters are meta-heuristicallyselected via a Particle-Swarm-Optimization (PSO) algorithm. The proposed control scheme exhibits rapid transits with improveddamping in its response which aids in efficiently rejecting external disturbances such as load-transients and input-fluctuations. The superior robustness and time-optimality of the proposed control strategy is validated via experimental results.
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Lim, Dong-Hwan,Saleem, Mohsin,Kim, In-sung,Kim, Min-Soo,Koo, Bo-Kun,Jeong, Soon-Jong Elsevier 2018 Sensors and actuators. A, Physical Vol.282 No.-
<P><B>Abstract</B></P> <P>This study involves the microstructure tailoring of two types of ferroelectric and relaxor composites and their frequency-dependent large-signal properties. The ferroelectric seed of Bi<SUB>0.5</SUB>(NaK)<SUB>0.5</SUB>TiO<SUB>3</SUB> (BNKT) and a relaxor matrix of 0.74 Bi<SUB>0.5</SUB>Na<SUB>0.5</SUB>TiO<SUB>3</SUB>-0.26SrTiO<SUB>3</SUB> (BNST) with a ratio of 0.1 were synthesized via a solid-state reaction. Two types of BNKT ferroelectric seeds, namely a large-sized template-type (t-BNKT) and small-sized powder-type (c-BNKT), were prepared. Additionally, X-ray diffraction and microstructure analyses revealed that the addition of BNKT to BNST induced the formation of two phases (ferroelectric and relaxor). BNKT/BNST exhibited a combination of relaxor and ferroelectric phases, while the relaxor corresponded to the major phase in pure BNST. The t-BNKT/BNST composite exhibited a large-sized ferroelectric phase in the relaxor matrix with a small population, and the c-BNKT/BNST contained a small-sized ferroelectric phase with a large population of the relaxor matrix in the microstructure. In high-field applications, BNST exhibited pinch-type polarization behavior due to the transition from polar nanocluster to ferroelectric microscale domains in the relaxor matrix. The addition of t-BNKT and c-BNKT accelerated the coexistence of the ferroelectric and relaxor phases, thereby inducing pinch-shaped polarization with high remnant polarization and parabolic strain behavior with high negative strain. The pure BNST and t-BNKT/BNST exhibited a transition from the relaxor to ferroelectric phases at a high-field application over 4 kV/mm. Furthermore, the advent of the ferroelectric phase in c-BNKT/BNST led to a transition from short-range polar ordering to long-range ferroelectric ordering when a lower field (<3 kV/mm) was applied. However, the sample exhibited difficulties in reverse transition upon removal of the applied field. The electromechanical properties of c-BNKT/BNST and t-BNKT/BNST indicated a significant change in the frequency dependence of the polarization and strain, which was related to the presence of the ferroelectric phase. The aforementioned property was evaluated based on the decay in the polarization behavior.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This paper describes the relationship between properties and size of core material in BNKT-BNST ceramic composite. </LI> <LI> BNKT-BNST composites showed the coexistence of ferroelectric and relaxor phases. </LI> <LI> The large size and small population of ferroelectric BNKT seed give a rise to a significant decay in frequency dependence of polarization and strain. </LI> </UL> </P>
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Fabrication of borosilicate-glass-coated CuAg inner electrode for multilayer ceramic actuator
Koo, Bo-Kun,Saleem, Mohsin,Lim, Dong-Hwan,Kim, Min-Soo,Kim, In-Sung,Jeong, Soon-Jong Elsevier 2018 Sensors and actuators. A Physical Vol.277 No.-
<P><B>Abstract</B></P> <P>This study introduces a new process for the fabrication of an electrode/ceramic multilayer device that uses a mixture of base and noble metals (Cu and Ag) as the inner electrode and is co-fired in air. In order to protect the Cu base metal when exposed to air, the Cu powder was sequentially coated with Ag nanoparticles using a wet process, and borosilicate glass using a sol-gel process. The degrees of oxidation and shrinkage of the glass-coated CuAg during the co-firing process were investigated. The glass-coated CuAg survived without the formation of copper oxide during the binder-burnout process in air at 500 °C. The CuAg was stable and unoxidized even when further heated to 950 °C, which is ascribable to the protection provided by the Ag layer to the Cu exposed to the oxidative atmosphere. The glass-coated CuAg exhibited complicated shrinkage behavior that was similar to that of glass at low temperatures, and to Ag and Cu densification at high temperatures. To examine the electrical performance of the glass-coated CuAg as an inner electrode, a CuAg/(Bi<SUB>0.37</SUB>Na<SUB>0.37</SUB>Sr<SUB>0.26</SUB>)TiO<SUB>3</SUB> (CuAg/BNST) multilayer-ceramic material was prepared using a conventional tape-casting and stacking procedure. The CuAg-paste binders were evaporated at 500 °C in air, and the CuAg electrode was then sintered at 950 °C in air. The electromechanical performance of the CuAg/BNST ceramic device is similar to that of a AgPd/BNST device, indicating that it can potentially be used as the inner electrode in a multilayer device.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This paper shows the fabrication and properties of a mixture of copper (base metal) and silver (noble metal) electrode. </LI> <LI> The metal mixture can be processed in air atmophere for the fabrication of the actuator. </LI> <LI> In addition, the comparability of the metal mixture with BNT-ST ceramic for multilayer ceramic actuator was investigated. </LI> </UL> </P>
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Properties of CuAg/(BiNaSr)TiO<sub>3</sub> multilayer ceramic actuator
Jeong, Soon-Jong,Lim, Dong-Hwan,Saleem, Mohsin,Koo, Bo-Gun,Kim, Min-Soo Elsevier 2018 Ceramics international Vol.44 No.suppl1
<P><B>Abstract</B></P> <P>The purpose of this study is fabricate a multilayer device consisting of a lead-free piezoelectric ceramic (Bi<SUB>0.37</SUB>Na<SUB>0.37</SUB>Sr<SUB>0.26</SUB>)TiO<SUB>3</SUB> (BNST) and a base/noble (CuAg) metal mixture inner electrode, of which fabrication process was performed in air. During the fabrication process in air, a special treatment was proposed in which Cu is transformed into CuO due to direct contact with oxygen. The CuO is then reverse–converted to Cu by reaction between the hydrogen and the oxygen. Before co-firing process of binder burn-out (550 °C) and sintering (950 °C), the Cu is transformed into CuO by pre-heating at 500 °C in air. Then, the CuO-Ag material was used for an internal electrode in the co-firing process of the multilayer ceramic devices. Post heat treatment was carried out with the device at constant temperature of 300 °C under N<SUB>2</SUB> (95 vol%)/H<SUB>2</SUB> (5 vol%) mixed gas in order to convert from CuO to Cu. The electrical and mechanical properties of the CuAg/BNST device were then evaluated. For comparison, a piezoelectric multilayer device (AgPd(9:1)/BNST) with a noble inner electrode was prepared. Electrical and mechanical properties of CuAg/BNST were comparable to those of AgPd/BNST.</P>
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Adnan Yaqub,Syed Atif Pervez,Umer Farooq,Mohsin Saleem,도칠훈,You-Jin Lee,Minji Hwang,Jeong-Hee Choi,Doohun Kim 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.3
A new conductive material, copper/Super-P carbon black composite (Cu-SPB), is prepared viaan efficient ion reducing method for use in low-temperature lithium-ion batteries (LIBs). Thepresent study investigated the effects of copper content on the low-temperature performance ofLIBs. Electrodes prepared with a high-copper-content conductive material (Cu = 18.54%) showedremarkably improved performance in terms of capacity retention (around 40%), cycling stability, andcolumbic efficiency. The electrochemical impedance spectroscopy (EIS) analysis revealed that thepresence of higher Cu contents could reduce the cell’s impedance. The results were also confirmedby using a coin-type full cell’s improved capacity retention, which indicated the significance of Cuparticles in enhancing the low-temperature performance of LIBs.
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