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A QoE Evaluation Method for RT-HDMV Based on Multipath Relay Service
Yu-Zhuo Zhan,Wei-Min Lei,Yun-Chong Guan 한국통신학회 2019 한국통신학회 학술대회논문집 Vol.2019 No.1
In the paper, a multipath relay service based on QoE (Quality of Experience) evaluation method is proposed for RT-HDMV (Real-Time High Definition Medical Video). The method eliminates several of the limitations in the existing methods for the conventional single-path transmission. It can fully utilize the finite network resources and transmission bandwidth to meet the users’ demands of RT-HDMV to get the better score of QoE. We use a three-stage framework to evaluate the QoE: construct the multipath relay transmission for RT-HDMV, design the load distribution strategy by the mapping between QoS (Quality of Service) and QoE and coupling the multipath scene, and redefine the rule of QoE evaluation. The experiments show that our framework can provide better QoE guarantees for RT-HDMV than existing methods in traditional single-channel transmission scenarios.
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Yi, Hao,Zhuo, Fang,Li, Yu,Zhang, Yanjun,Zhan, Wenda The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.5
Instead of extracting every selected harmonic component, the current reference of selective active power filter (APF) can be also obtained by filtering out the fundamental component from distorted load current for computation efficiency. This type of mixed current reference contains kinds of harmonic components and easily involves noises. In this condition, selective harmonic compensation must be realized by the current controller. With regard that selectivity is the most significant feature of controller, this paper presents specific comparison analysis between two types of resonant controllers: proportional-resonant (PR) controller and vector-resonant (VR) controller. The comparison analysis covers the relations, performances, and stability of both controllers. Analysis results conclude that the poorer selectivity of the PR controller could be relatively improved, but limitations from system stability make the improvement hardly realized. By contrast, the VR controller exhibits excellent selectivity and is more suitable for selective APF with mixed current reference. Experimental results from laboratory prototype validate the reasonability of analysis. And the features of each resonant controller are concluded.
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Hao Yi,Fang Zhuo,Yu Li,Yanjun Zhang,Wenda Zhan 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.5
Instead of extracting every selected harmonic component, the current reference of selective active power filter (APF) can be also obtained by filtering out the fundamental component from distorted load current for computation efficiency. This type of mixed current reference contains kinds of harmonic components and easily involves noises. In this condition, selective harmonic compensation must be realized by the current controller. With regard that selectivity is the most significant feature of controller, this paper presents specific comparison analysis between two types of resonant controllers: proportional-resonant (PR) controller and vector-resonant (VR) controller. The comparison analysis covers the relations, performances, and stability of both controllers. Analysis results conclude that the poorer selectivity of the PR controller could be relatively improved, but limitations from system stability make the improvement hardly realized. By contrast, the VR controller exhibits excellent selectivity and is more suitable for selective APF with mixed current reference. Experimental results from laboratory prototype validate the reasonability of analysis. And the features of each resonant controller are concluded.
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