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- 저자 : ( Rongchun Li ) (검색결과 3 건)
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From WiFi to WiMAX: Efficient GPU-based Parameterized Transceiver across Different OFDM Protocols
( Rongchun Li ),( Yong Dou ),( Jie Zhou ),( Baofeng Li ),( Jinbo Xu ) 한국인터넷정보학회 2013 KSII Transactions on Internet and Information Syst Vol.7 No.8
Orthogonal frequency-division multiplexing (OFDM) has become a popular modulation scheme for wireless protocols because of its spectral efficiency and robustness against multipath interference. Although the components of various OFDM protocols are functionally similar, they remain distinct because of the characteristics of the environment. Recently, graphics processing units (GPUs) have been used to accelerate the signal processing of the physical layer (PHY) because of their great computational power, high development efficiency, and flexibility. In this paper, we describe the implementation of parameterized baseband modules using GPUs for two different OFDM protocols, namely, 802.11a and 802.16. First, we introduce various modules in the modulator/demodulator parts of the transmitter and receiver and analyze the computational complexity of each module. We then describe the integration of the GPU-based baseband modules of the two protocols using the parameterized method. GPU-based implementations are addressed to explain how to accelerate the baseband processing to archive real-time throughput. Finally, the performance results of each signal processing module are evaluated and analyzed. The experiments show that the GPU-based 802.11a and 802.16 PHY meet the real-time requirement and demonstrate good bit error ratio (BER) performance. The performance comparison indicates that our GPU-based implemented modules have better flexibility and throughput to the current ones.
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Li, Rongchun Korean Chemical Society 2012 대한화학회지 Vol.56 No.4
A novel chitosan derivative with double quaternary ammonium salt-2-pyridine-acetyl-N-trimethyl chitosan chloride (PATMCS) was synthesized and the antioxidant activity of PATMCS against hydroxyl radicals was assessed. The results indicated that PATMCS had potent hydroxyl scavenging activity. The $IC_{50}$ of PATMCS was 0.13 mg/mL. PATMCS showed 100% scavenging effect at a dose of 0.8 mg/mL which markedly better than that of N-trimethyl chitosan chloride (TMCS). It was confirmed that quaternary chitosan derivatives showed potent antioxidant activity. PATMCS has double quaternary ammonium salt structure in the molecules. Therefore, the antioxidant activity of PATMCS was better than TMCS. The above results are theoretically fundamental for further development and making use of chitosan resources to prepare new antioxidants.
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CO hydrogenation to higher alcohols over Ni- and Mo-modified Cu/CeO2 catalyst
Wei Li,Jun Chen,Rongchun Shen 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.2
Ni-Mo promoted Cu/CeO2 catalyst was synthesized by co-precipitation method using 28%wt NH3·H2O as the precipitant. The catalysts were characterized by BET, XRD, TPR and XPS. The results showed that Ni and Mo could promote the reducibility of Cu, and the interaction between Ni and Mo may be needed for catalytic activity and higher alcohols synthesis. Therefore, CuNiMo/CeO2 catalyst showed a higher activity for higher alcohols synthesis than Cu/CeO2. In the meantime, the effect of pyrogallol used in preparing the CuNiMo/CeO2 catalyst was investigated. Pyrogallol had a significant influence on lowering the methanol selectivity and improving the C2+-OH selectivity. The methanol selectivity decreased from 52.99% to 44.81% and SC2+OH/SMeOH (MeOH denoted as methanol) ratio increased from 0.27 to 0.35. The XPS results gave evidence that pyrogallol can form complexes with Cu+ on the CeO2 support, which causes methanol decrease. In addition, pyrogallol could serve as a “temperature addictive agent” to save power.
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