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RISS 인기검색어
- 검색키워드
- 저자 : Qingyong Chen (검색결과 4 건)
- 무료
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- 유료
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Dynamic Spectrum Sharing for Hybrid Access in OFDMA-Based Cognitive Femtocell Networks
Deng, Qingyong,Li, Zhetao,Chen, Jiabei,Zeng, Fanzi,Wang, Hui-Ming,Zhou, Liang,Choi, Young-June IEEE 2018 IEEE Transactions on Vehicular Technology VT Vol.67 No.11
<P>Cognitive femtocell has emerged as one of the promising ways to solve the indoor coverage and spectrum shortage problems in cellular networks. However, it is a challenge to motivate both macro base station ( <TEX>$\text{MBS}$</TEX>) and femtocell access points ( <TEX>$\text{FAPs}$</TEX>) to adopt this hybrid access policy. In this paper, we propose a systematic dynamic spectrum sharing framework for hybrid access in orthogonal frequency-division multiple-access-based cognitive macro-femtocell networks. In this framework, the <TEX>$\text{MBS}$</TEX> offloads some macro user equipments ( <TEX>$\text{MUEs}$</TEX>) to <TEX>$\text{FAP}$</TEX> to improve the transmission performance and save energy. In return, the MBS leases a portion of its spectrum to <TEX>$\text{FAP}$</TEX>. Then, the <TEX>$\text{FAP}$</TEX> can use a part of spectrum for its own transmission and use another part to serve <TEX>$\text{MUEs}$</TEX>. We design an auction-based approach where each <TEX>$\text{FAP}$</TEX> receives additional <TEX>$\text{MUE}$</TEX> as bidders, while MBS acts as auctioneer. We formulate the dynamic resource sharing as a sum utility maximization problem. Numerical results demonstrate that both the macro and femtocell could get benefit from our framework.</P>
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Dan Xiao,Kaisen Huang,Qingyong Chen,Baotao Huang,Wei Liu,Yong Peng,Mao Chen,Dejia Huang,Tong Zou,Jiefu Yang 한국유전학회 2015 Genes & Genomics Vol.37 No.7
Apolipoprotein B plays a central role in lipoprotein metabolism. Many studies have evaluated the association between Apolipoprotein B gene polymorphisms (XbaI, EcoRI, SpIns/Del, MspI) and the risk for coronary artery disease and myocardial infarction. However, the results remain inconsistent, particularly among different populations. To more precisely determine the association between Apolipoprotein B gene polymorphisms and coronary artery disease/myocardial infarction risk, we performed a meta-analysis via a comprehensive search of electronic databases (up to February 1st, 2015), odds ratios (OR) and 95 % confidence intervals were calculated using a fixed or random effect model. A total of 47 studies, with 9411 coronary artery disease/myocardial infarction cases and 9082 controls, were included in this meta-analysis. The combined results revealed significant associations between an increased risk of coronary artery disease/myocardial infarction and EcoRI (AA vs GG: OR 1.511, 95 % confidence interval (CI) 1.098, 2.078) and SpIns/Del (DD vs II: OR 1.331, 95 % CI 1.064, 1.665) alleles in the general population. In a subgroup analysis stratified by ethnicity, the T allele of the XbaI variant was associated with a decreased risk in Caucasians, whereas it was associated with an increased risk among the East Asian population. No significant correlation was detected between the A allele of the MspI variant and the coronary artery disease/myocardial infarction risk in either the general population or any ethnic subgroup. The results of our study suggest that Apolipoprotein B gene polymorphisms may affect the coronary artery disease/myocardial infarction susceptibility and these effects may display notable discrepancies among different populations.
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Differences in the gut microbiota between Cercopithecinae and Colobinae in captivity
Zongjin Huan,Yongfang Yao,Jianqiu Yu,Hongwei Chen,Meirong Li,Chaojun Yang,Bo Zhao,Qingyong Ni,Mingwang Zhang,Meng Xie,Huailiang Xu 한국미생물학회 2020 The journal of microbiology Vol.58 No.5
The gut microbiome of captive primates can provide a window into their health and disease status. The diversity and composition of gut microbiota are influenced by not only host phylogeny, but also host diet. Old World monkeys (Cercopithecidae) are divided into two subfamilies: Cercopithecinae and Colobinae. The diet and physiological digestive features differ between these two subfamilies. Accordingly, highthroughput sequencing was used to examine gut microbiota differences between these two subfamilies, using data from 29 Cercopithecinae individuals and 19 Colobinae individuals raised in captivity. Through a comparative analysis of operational taxonomic units (OTUs), significant differences in the diversity and composition of gut microbiota were observed between Cercopithecinae and Colobinae. In particular, the gut microbiota of captive Old World monkeys clustered strongly by the two subfamilies. The Colobinae microbial diversity was higher than that of Cercopithecinae. Additionally, Firmicutes, Lactobacillaceae, Veillonellaceae, and Prevotella abundance were higher in Cercopithecinae, while Bacteroidetes, Ruminococcaceae, Christensenellaceae, Bacteroidaceae, and Acidaminococcaceae abundance were higher in Colobinae. PICRUSt analysis revealed that the predicted metagenomes of metabolic pathways associated with proteins, carbohydrates, and amino acids were significantly higher in Colobinae. In the context of host phylogeny, these differences between Cercopithecinae and Colobinae could reflect adaptations associated with their respective diets. This well-organized dataset is a valuable resource for future related research on primates and gut microbiota. Moreover, this study may provide useful insight into animal management practices and primate conservation.
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Biological and Chemical Microsensors for Health Care and Environment Monitoring
Shanhong Xia,Chao Bian,Qiannan Xue,Jizhou Sun,Qingyong Chen 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This paper presents several biological and chemical microsensors developed based on micro and nano technologies for the applications of health care and environment monitoring, including micro amperometric biosensor, micro potentiometric immunosensor and micro gas sensor and so on. The electroactivities of the micro amperometric biosensor with three-dimensional microelectrodes was enhanced obviously with the help of the nano- and microstructures. By introducing nanoparticles with seed mediated growth method, the sensitivity of the micro potentiometric immunosensor for %HbA1c has been increased. A micro pellistor with nanoporous alumina catalyst carrier have been constructed for detecting combustible gas below the lower explosive limit, which shows advantages of low power comsumption, good thermal performance and easy fabrication.
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