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( Chen Yihong ),( Feng Quanyuan ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.11
Radio frequency identification (RFID) is an emerging wireless communication technology which allows objects to be identified automatically. The tag anti-collision is a significant issue for fast identifying tags due to the shared wireless channel between tags and the reader during communication. The EPCglobal Class-1 Generation-2 which uses Q algorithm for the anti-collision is widely used in many applications such as consumer electronic device and supply chain. However, the increasing application of EPCglobal Class-1 Generation-2 which requires the dynamic environment makes the efficiency decrease critically. Furthermore, its frame length (size) determination and frame termination lead to the suboptimal efficiency. A new anti-collision algorithm is proposed to deal with the two problems for large-scale RFID systems. The algorithm has higher performance than the Q algorithm in the dynamic environment. Some simulations are given to illustrate the performance.
Wenwei Yu,Faying Lai,Jinbao He,Kaiyun He,Rong Wang,Danping Li,Quanyuan Chen 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.118 No.-
Catalytic performances and leaching behavior of 9 natural iron minerals as heterogeneous electro-Fentoncatalysts for the treatment of imidacloprid wastewater were studied. The results showed that magnesioferriteexhibited the best catalytic ability among these minerals with UV absorbance at 270 nm (UV270)removal of 83.59% and COD removal of 49.11% within 4 h using graphite cathode and Ti/(RuO2)0.88-(IrO2)0.12 anode at initial pH 3 with a catalyst dose of 5 g/L, a current density of 40 mA/cm2 and an electrodespacing of 2 cm. The instantaneous current efficiency (ICE) at 4 h and energy consumption (EC)reached 2.30% and 2.20 kWh/gCOD respectively. It was found that the components contained in naturaliron minerals, such as Al, alkali metal (K) and alkaline earth metals (Mg, Ca, Ba), would dissolve into theelectrolyte solution, raising the final pH to 6.5–8.5 and ultimately reducing the reaction efficiency. Exceptmagnetite and magnesioferrite, other minerals, such as ilmenite and V-Ti magnetite, were likely to causesecondary pollution. The subsequent adjustment to alkaline state for chemical precipitation of leachedMn was needed. Pyrite showed relatively high leachability in hazardous elements (especially Pb), whichshould be carefully evaluated before its actual application in electro-Fenton process.