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      저자 : Jiamei Lin (검색결과 2 건)
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        Multi-agent Q-learning based Admission Control Mechanism in Heterogeneous Wireless Networks for Multiple Services

        ( Jiamei Chen ),( Yubin Xu ),( Lin Ma ),( Yao Wang ) 한국인터넷정보학회 2013 KSII Transactions on Internet and Information Syst Vol.7 No.10

        In order to ensure both of the whole system capacity and users QoS requirements in heterogeneous wireless networks, admission control mechanism should be well designed. In this paper, Multi-agent Q-learning based Admission Control Mechanism (MQACM) is proposed to handle new and handoff call access problems appropriately. MQACM obtains the optimal decision policy by using an improved form of single-agent Q-learning method, Multi-agent Q-learning (MQ) method. MQ method is creatively introduced to solve the admission control problem in heterogeneous wireless networks in this paper. In addition, different priorities are allocated to multiple services aiming to make MQACM perform even well in congested network scenarios. It can be observed from both analysis and simulation results that our proposed method not only outperforms existing schemes with enhanced call blocking probability and handoff dropping probability performance, but also has better network universality and stability than other schemes.

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        Characteristics of long-range transported PM2.5 at a coastal city using the single particle aerosol mass spectrometry

        Qiuliang Cai,Lei Tong,Jingjing Zhang,Jie Zheng,Mengmeng He,Jiamei Lin,Xiaoqiu Chen,Hang Xiao 대한환경공학회 2019 Environmental Engineering Research Vol.24 No.4

        Air pollution has attracted ever-increasing attention because of its substantial influence on air quality and human health. To better understand the characteristics of long-range transported pollution, the single particle chemical composition and size were investigated by the single particle aerosol mass spectrometry in Fuzhou, China from 17th to 22nd January, 2016. The results showed that the haze was mainly caused by the transport of cold air mass under higher wind speed (10 m·s<SUP>-1</SUP>) from the Yangtze River Delta region to Fuzhou. The number concentration elevated from 1,000 to 4,500 #·h<SUP>-1</SUP>, and the composition of mobile source and secondary aerosol increased from 24.3% to 30.9% and from 16.0% to 22.5%, respectively. Then, the haze was eliminated by the clean air mass from the sea as indicated by a sharp decrease of particle number concentration from 4,500 to 1,000 #·h<SUP>-1</SUP>. The composition of secondary aerosol and mobile sources decreased from 29.3% to 23.5% and from 30.9% to 23.1%, respectively. The particles with the size ranging from 0.5 to 1.5 ㎛ were mainly in the accumulation mode. The stationary source, mobile source, and secondary aerosol contributed to over 70% of the potential sources. These results will help to understand the physical and chemical characteristics of long- range transported pollutants.

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