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( Shaheer Nadeem ),( Raman Mundi ),( Harman Chaudhry ) 대한슬관절학회 2021 대한슬관절학회지 Vol.33 No.-
Purpose: Kneeling ability is among the poorest outcomes following total knee arthroplasty (TKA). The purpose of this meta-analysis was to: (1) quantify kneeling ability after TKA; (2) identify surgical approaches and prosthesis designs that improve kneeling ability following TKA; and (3) quantify the effectiveness of these approaches. Methods: We performed a systematic review in accordance with the PRISMA guidelines of multiple medical databases. Data relating to demographics, TKA technique, prosthesis design, and kneeling-specific outcomes were extracted. Comparative outcomes data were pooled using a random effects model. Results: Thirty-six studies met the eligibility criteria. The proportion of patients able to kneel increased with longer follow-up (36.8% at a minimum of 1 year follow-up versus 47.6% after a minimum of 3 years follow-up, p < 0.001). The odds of kneeling were greater for patients undergoing an anterolateral incision compared with an anteromedial incision (OR 3.0, 95% CI 1.3-6.9, p = 0.02); a transverse incision compared with a longitudinal incision (OR 3.5, 95% CI 1.4-8.7, p = 0.008); and a shorter incision compared with a longer incision (OR 8.5, 95% CI 2.3-30.9, p = 0.001). The odds of kneeling were worse for a mobile prosthesis compared with a fixed platform design (OR 0.3, 95% CI 0.1-0.7, p = 0.005). Conclusion: A large majority of patients are unable to kneel following TKA, although the ability to kneel improves over time. This evidence may facilitate preoperative patient counseling. Variations in choice of incision location and length may affect ability to kneel; however, high-quality randomized trials are needed to corroborate our findings.
Shaheer Akhtar, M.,Choi, D.J.,Lee, S.K.,Yang, O.B. Elsevier 2010 Current Applied Physics Vol.10 No.2
A composite electrolyte for dye-sensitized solar cell (DSSC) was prepared with heteropolyacids (HPA) and polyethylene oxide (PEO) in the mixture solvent of chloroform and methanol. The amorphicity and ionic conductivity of the HPA-PEO composite electrolytes were significantly enhanced upon the appropriate dose of electron beam (e-beam) irradiation in the range of 40-120kGy. A DSSC fabricated with HPA-PEO irradiated at the optimum dose of 120kGy showed maximum overall conversion efficiency of 3.4% with a V<SUB>OC</SUB>of 0.588V, I<SUB>SC</SUB>of 9.68mA/cm<SUP>2</SUP>and fill factor of 58.9% under 100mW/cm<SUP>2</SUP> which improved by 13% efficiency in comparison with the DSSC with bare HPA-PEO composite electrolytes.
Shaheer Ahmed Khan,Ataur Rahman,Wajahat Khan,Syed Mustafa Haider 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.10
Flexible, economical, and low-toxic organic solar cells are becoming highly popular in photovoltaic research. Interestingly, its efficiency of energy conversion remains lower than that of silicon-based solar cells. As a result, it is unavoidable to focus on organic solar cell efficiency enhancement. This article presents a nano-composite thin-film developed using zinc oxide (ZnO) and polyvinyl alcohol (PVA) with a solution casting technique varying weight percentage (wt.%) of ZnO into the PVA matrix. The characterization of the thin-film of ZnO/PVA has been made using SEM, XRD, FTIR, and UV-Vis spectroscopy. The characterization reveals that the ZnO nanoparticle network forms an excellent path for electron flow in the PVA matrix at the optimal ZnO concentration of 16.66 % and a PVA concentration of 83.33 %. The thin film was applied to an organic solar cell of architecture consists of carbon fiber reinforced with ZnO-epoxy resin/CuO-epoxy resin for performance investigation. The solar cell's maximum efficiency was determined to be 9.01 % before and 14.65 % after using the nanocomposite film. 5.64 % increase in the efficiency of organic solar cells are observed after the ZnO/PVA nanocomposite thin film is applied.
Simulation study of meniscus interfacial charge by electrode positioning in a flat EHD nozzle system
Shaheer Mohiuddin Khalil,Rizwan Ul Hassan,Doyoung Byun 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Electrohydrodynamic (EHD) jet printing is a promising technique with a variety of benefits such as higher resolution and the ability to work with high-viscosity inks compared to conventional inkjet techniques. The nozzle is an important variable when it comes to EHD printing that can significantly influence print quality. Generally, flat nozzles have certain advantages over protruded nozzles, such as easier cleaning and lower susceptibility to damage but one prevalent issue is wetting. In this study charge distribution caused by the permittivity gradient was observed by simulation at the meniscus interface to better understand the effect of electrode positioning on the jetting profile in a flat EHD nozzle system. It was observed that electrode positioning indeed affects the charge distribution at the two-phase line, therefore; showed significant effects on the jetting profile and wetting. This understanding can help in controlling the wetting and subsequently improving the jetting for improved print quality.
M. Shaheer Akhtar,Dae-Jin Choi,O-Bong Yang,이상권 한국물리학회 2010 Current Applied Physics Vol.10 No.2
A composite electrolyte for dye-sensitized solar cell (DSSC) was prepared with heteropolyacids (HPA) and polyethylene oxide (PEO) in the mixture solvent of chloroform and methanol. The amorphicity and ionic conductivity of the HPA–PEO composite electrolytes were significantly enhanced upon the appropriate dose of electron beam (e-beam) irradiation in the range of 40–120 kGy. A DSSC fabricated with HPA–PEO irradiated at the optimum dose of 120 kGy showed maximum overall conversion efficiency of 3.4% with a VOC of 0.588 V, ISC of 9.68 mA/㎠ and fill factor of 58.9% under 100 mW/㎠ , which improved by 13% efficiency in comparison with the DSSC with bare HPA–PEO composite electrolytes.
M. Shaheer Akhtar,형정환,Dong-Joo Kim,양오봉,이상권,김태홍 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.3
We demonstrate for the first time novel perforated ZnO nanotube /TiO2 electrode-based dyesensitized solar cells (DSSCs). From the current-voltage characteristics, the open-circuit voltage VOC, short-circuit current density JSC, and the fill factor FF were determined to be ~0.84 V,~4.82 mA/cm2, and 0.60, respectively. We obtained a power conversion efficiency, η, of ~2.4%under air mass 1.5 global solar conditions. This represented an improvement of approximately 2 times as compared to ZnO nanowire/TiO2 electrode-based DSSCs. The superior photovoltaic performance and JSC value are attributed to high dye loading and high light harvesting via the high surface area of the ZnO nanotubes.