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Arifeen, Tooba,Hassan, Abdus Sami,Moradian, Hossein,Lee, Jeong A. Institution of Electrical Engineers 2018 Electronics letters Vol.54 No.15
<P>Area overhead reduction in conventional triple modular redundancy (TMR) by using approximate modules has been proposed in the literature. However, the vulnerability of approximate TMR (ATMR) in the case of a critical input, where faults can lead to errors at the output, is yet to be studied. Here, identifying critical input space through automatic test pattern generation and making it unavailable for the technique of approximating modules of TMR (ATMR) were focused, which involves a prime implicant reduction expansion. The results indicate that the proposed method provides 75-98% fault coverage, which amounts up to 43.8% improvement over that achieved previously. The input vulnerability-aware approach enables a drastic reduction in search space, ranging from 41.5 to 95.5%, for the selection of candidate ATMR modules and no compromise on the area overhead reduction is noticed.</P>
Ting Dong,Waqas Ul Arifeen,Minchoel Kim,Jungwook Choi,Kisoo Yoo,Tae Jo Ko 한국섬유공학회 2020 Fibers and polymers Vol.21 No.10
Membranes were prepared from polyacrylonitrile (PAN) fibers with uniform diameter for lithium-ion batteryseparators using optimized electrospinning parameters. In this work, the coefficient of variation (CV) is proposed as one ofthe indexes to evaluate the uniform consistency of fiber diameter. The most uniform fibrous membrane was compared with acontrol group that had different uniformity. The effects of the uniformity of the fiber diameter were studied in terms of themembrane porosity, electrolyte absorption, mechanical tensile strength, and thermal stability. The membranes wereassembled into coin cells with lithium cobaltite cathodes and graphite anodes, and the performance of the cells was tested. Asthe uniformity of the fiber diameter increased, the ionic conductivity improved and the interface resistance decreased. Theproposed separator improves the discharge capacity (181 mAh·g-1 at the 0.2C rate), C-rate cycling performance, andCoulombic efficiency (99.64 %), which indicates that the uniform membrane could be a candidate for high-performancelithium-ion battery separators.
열압착 온도가 전기방사 Polyacrylonitrile 분리막의 기계적 강도 및 물성치에 미치는 영향
김민철(Minchoel Kim),고태조(Tae Jo Ko),와카스 울 아리핀(Waqas Ul Arifeen),동정(Dong Ting) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.4
The mechanical deformation of a battery separator causes internal short-circuiting of the cathode anode, which directly affects the explosion/ignition of batteries. To increase the mechanical properties of the separator fabricated by electro-spinning, use of a thermal pressing method is inevitable. Therefore, this research aims to maximize the mechanical strength of a porous separator by finding the proper thermal press temperatures given to Electro-spun Polyacrylonitrile (PAN) nanofibers. The different thermal press temperatures 25°C, 50°C, 75°C, and 100°C were applied to the electro-spun fiber at 30 MPa pressure for one hour. The higher the temperature, the higher the resultant tensile strength; however, a higher temperature also lowered the strain and porosity. Thus, the membrane thermal pressed at 50°C showed the best mechanical properties and the second highest porosity. Using the data, 50°C was judged as the best thermal pressing temperature in terms of performance.