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An Improved BER-Optimal Relay Selection Scheme for Decode-and-Forward Cooperative Networks
Yuhui Han,Mingji Yang,Aili Wang 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.1
We are concerned with the relay selection in a decode-and-forward cooperative network to minimize the bit error rate (BER) in a radio cell. This problem can be solved using maximum weighted (MW) matching algorithm, greedy matching algorithm or worst-link-first (WLF) matching algorithm. Among the algorithms, WLF matching algorithm has achieved much attention for its being less complex while the achieved performance is high. In order to further reduce the computational complexity, we propose an improved WLF relay selection scheme, in which relays are selected according to instantaneous channel state information (CSI) and a cooperative threshold is set up to eliminate some unsatisfying candidate relays from the set of alternative candidate relays and thus reduce the amount of calculation. Theory analysis and simulation results both show that the improved WLF relay selection scheme proposed can be easily implemented and achieve almost the same BER performance as that of WLF scheme while the computational complexity is much lower.
Online monitoring of IGBT junction temperature based on V<sub>ce</sub> measurement
Cao, Han,Ning, Puqi,Chai, Xiaoguang,Zheng, Dan,Kang, Yuhui,Wen, Xuhui The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.2
In this paper, an online junction temperature monitoring method based on the on-state voltage under high collector current density measurements for IGBT power modules is proposed. Unlike the conventional junction temperature monitoring method, the presented method can extract the junction temperature during operation without altering the modulation strategy or topology of the converter. The proposed method is verified by simulations and the JEDEC-51 standard recommended approach. To accurately extract the on-state voltage during operation, a measurement circuit that combines the advantages of both the active MOSFET clamp and the diode clamp is designed and tested. It has been shown to have good accuracy and a rapid response time. After the calibration results are obtained, the presented method is applied to a three-phase voltage source converter controlled by a closed-loop SVPWM modulation strategy.
Development and certification of bifenazate diazene reference material using mass balance method
Young Hoon Kim,YuHui Son,Chan-yang Lee,Jeong Ju Moon,Uijeong Park,Heesun Yu,Jae-hyuk Han,Hongjun Jang,Hyoungsu Kim,Dongjoo Lee,Seung-Hoon Baek 한국분석과학회 2021 학술대회논문집 Vol.2021 No.11
Bifenazate diazene (BD) is a environmental metabolite of bifenazate a selective carbazate acaricide. The residual levels of bifenazate and BD is regulated in food stuffs. In this study, we aimed to develop a certified reference material (CRM) of BD for efficient and reliable testing. BD was synthesized from bifenazate through the catalytic aerobic oxidation. Organic impurity was determined using HPLC-UV assay. Inorganic impurity was determined using loss on ignition. The content of water and residual solvent were determined using Karl fisher coulometric titration and residual solvent assay, respectively. Calculated purity of candidate CRM was 99.67%, and expanded uncertainty was 0.03% at 95% confidence levels. Homogeneity and stability test will be further carried out to ensure the reliability of CRM. The estabilished CRM will be useful to determine the BD residue levels in food.
Qingxiang Yang,Jia Wang,Xinkuan Han,Yuanyuan Xu,Dong Liu,Hongxin Hao,Xuemei L,Yuhui Guo,Tianqi Niu,Shiyue Qi 한국생물공학회 2014 Biotechnology and Bioprocess Engineering Vol.19 No.1
In this study, the bacterial dynamics andstructure compositions in the two-stage biological processof a full-scale printing and dyeing wastewater (PDW)treatment system were traced and analyzed by terminalrestriction fragment length polymorphism (T-RFLP) and454 pyrosequencing techniques. T-RFLP analysis showedthat the microbial communities experienced significantvariation in the process of seed sludge adaptation to thePDW environments and were in constant evolution duringthe whole running period of the system, despite theconstant COD and color removal effects. Pyrosequencingresults indicated that the two-stage biological systemharbored rather diverse bacteria, with Proteobacteria beingthe predominant phylum during the steady running period,although its microbial compositions differed. The firststageaerobic tank was dominated by α-Proteobacteria(89.05% of Proteobacteria), whereas in the second-stageaerobic tank, β- and γ-Proteobacteria, besides α-Proteobacteria,were the dominant bacterial populations.